The alpha carbon is the central carbon in an amino acid and is bonded to the amino and carboxyl groups, as well as the R group. The beta carbon is bonded to the alpha carbon. These differences in bonding arrangements contribute to the differences in properties and functions of amino acids.
Explanation:The alpha (a) carbon and the beta (b) carbon are both important structural components of amino acids. The alpha carbon is the central carbon atom in an amino acid, and it is bonded to the amino group, the carboxyl group, a hydrogen atom, and the R group. The R group is what differentiates one amino acid from another. On the other hand, the beta carbon is not directly connected to the amino or carboxyl group, but it is bonded to the alpha carbon. The difference in the bonding arrangements of these two carbons gives rise to differences in the properties and functions of amino acids.
8. Determine the number of significant figures in the following numbers
Answer:
a) 5
b) 4
c) 3
d) 3
e) 4
Explanation:
I use only one rule when the decimal is present, meaning you can see the decimal (as is the case with all of these).
When the decimal is Present, start counting sig figs from the Pacific (left) side of the number beginning with the first non-zero digit and count all the way to the end.
So, for example, in "a", the first non-zero digit starting from the left is 1, then continue counting all the way to the right side.
For "c", the first non-zero digit is the left most 4 (skip the first 4 zeros), then count all the way to the right side.
A student increases the temperature of a 200cm3 balloom from 60 degress C to 180 degrees C. What will the new volume of the balloon be? (Be careful with units)
600cm^3
100cm^3
236cm^3
272cm^3
Answer:
The new volume of the balloon is 600cm³
Explanation:
Given parameters:
Initial Volume, which is V₁ = 200cm³
Initial temperature, T₁ = 60°C
Final temperature T₂ = 180°C
Final Volume V₂ =?
To solve this kind of problem, we apply one of the gas laws that shows the relationship between volume and temperature.
This law is the Charles law, it states that " the volume of a fixed mass of a gas is directly proportional to its absolute temperature if pressure is constant".
It is simply expressed as:
V₁/T₁ = V₂/T₂
Since our unknown is V₂, we make it the subject of the expression given above:
V₂ = V₁T₂/T₁
Now input the corresponding values and solve:
V₂ = 200 x 180 / 60
V₂ = 36000/60
V₂ = 600cm³
The new volume of the balloon is 600cm³
Solve using the correct gas law formula: If the pressure exerted by gas at 25 °C in a constant volume of 3.81 atm, What will the pressure be at 50 °C?
Answer:
4.31 atm.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If n and V are constant, and have different values of P and T:(P₁T₂) = (P₂T₁)
Knowing that:
P₁ = 3.81 atm, T₁ = 25°C + 273 = 298 K,
P₂ = ??? atm, T₂ = 50°C + 273 = 323 K,
Applying in the above equation(P₁T₂) = (P₂T₁)
∴ P₂ = (P₁T₂)/(T₁) = (3.81 atm)(323 K)/(298 K) = 4.31 atm.
you fill a rigid steel container that has a volume of 20 L with nitrogen gas to a final pressure of 2 x 10^4 kpa at 23 Celsius. how mny kilorams of n2 does this cylinder contai
Answer:
4.549 kg.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm (P = 2 x 10⁴ kPa/101.325 = 197.4 atm).
V is the volume of the gas in L (V = 20.0 L).
n is the no. of moles of the gas in mol (n = ??? mol).
R is the general gas constant (R = 0.0821 L.atm/mol.K),
T is the temperature of the gas in K (T = 23° C + 273 = 296 K).
∴ n = PV/RT = (197.4 atm)(20.0 L)/(0.0821 L.atm/mol.K)(296 K) = 162.5 mol.
To find the mass of N₂ in the cylinder, we can use the relation:mass of N₂ = (no. of moles of N₂)*(molar mass of N₂) = (162.5 mol)*(28.0 g/mol) = 4549 g = 4.549 kg.
A 75.0-liter canister contains 15.82 moles of argon at a pressure of 546.8 kilopascals. What is the temperature of the canister?
Answer:
312 KExplanation:
1) Data:
a) V = 75.0 liter
b) n = 15.82 mol
c) p = 546.8 kPa
d) T = ?
2) Formula:
Ideal gas equation: pV = nRTWhere:
n = number of molesV = volumep = absolute pressureT = absolute temperatureR = Universal Gas constat: 8.314 kPa - liter / K-mol3) Solution:
a) Solve the equation for T:
T = pV / (nR)b) Substitute and compute:
T = 546.8 kPa × 75.0 l iter / (15.82 mol × 8.314 kPa-liter/K-mol) = 312 K(since the volume is expressed with 3 significant figures, the answer must show also 3 significant figures)
What needs to be done to balance this equation
Do you nothing (equation is balanced)
Change O2 to O4 on the left side of the equation
Add coefficient 2 to O2 on the left side of the equation
Remove Coefficient in front of H2O on the right side of the equation
Answer : The correct option is, Add coefficient 2 to [tex]O_2[/tex] on the left side of the equation.
Explanation :
Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.
The reactants and the products are separated by right arrow.
The species present on the left side of the right arrow is known as reactant and the species present on the right side of the right arrow is known as product.
If the amount of atoms of each type on the left and right sides of a reaction differs then to balance the equation by adding coefficient in the front of the elements or molecule or compound in the chemical equation.
The coefficient tell us about that how many molecules or atoms present in the chemical equation.
The given chemical reaction is,
[tex]CH_4+O_2\rightarrow CO_2+2H_2O[/tex]
This reaction is an unbalanced chemical reaction because in this reaction number of oxygen atoms are not balanced.
In order to balance the chemical equation, the coefficient '2' put before the [tex]O_2[/tex] and we get the balanced chemical equation.
The balanced chemical reaction will be,
[tex]CH_4+2O_2\rightarrow CO_2+2H_2O[/tex]
Hence, the correct option is, Add coefficient 2 to [tex]O_2[/tex] on the left side of the equation.
** WILL MARK BRAINLIEST **
Which term is used to describe the reactant that is not used up completely in a chemical reaction?
A. Catalytic reactant
B. Excess reactant
C. Limiting reactant
D. Theoretical yield
The answer is excess reactant
Answer: option B, excess reactant
Explanation:
Since one the reactants is in excess(high amount) compared to other.
Example reaction of H2& Cl2 gives HCl.
If we take excess H2 compared to Cl2. Then we call H2 as excess Reactant.
What is the physical state of the smallest alkanes at room temperature?
They are gases at room temperature
Hope this helps:)
The smallest alkanes, which are those with one to four carbon atoms, are gases at room temperature due to their nonpolar nature and weak dispersion forces.
The physical state of the smallest alkanes at room temperature can be understood by analyzing their properties and boiling points. Alkanes are nonpolar molecules associated through weak dispersion forces. The boiling point of a substance is a rough measure of the energy needed to separate molecules from each other. In the case of the smallest alkanes, specifically those with one to four carbon atoms, they are gases at room temperature. Example alkanes that are gases at room temperature include methane (CH4), ethane (C2H6), propane (C3H8), and butane (C4H10). In contrast, the physical state changes as the number of carbons increases; alkanes become liquids and eventually solids as the carbon chain length and molecular weight increase.
1+1is= Make that as a ?
Answer: The correct answer to this problem is 2.
Explanation:
We are given a mathematical problem, which is:
1 + 1 = ?
To solve this, we use the mathematical operator known as addition. In this, we add two numbers and the resulting value is the answer to the problem.
By adding 1 and 1, we get:
[tex]\Rightarrow 1+1=2[/tex]
Thus, the correct answer to this problem is 2.
Which gas law is considered when scuba diving?
Ideal gas law
Charles law
Boyles law
Combined gas law
The law is Boyel's law.
Explanation:One of the primary laws of material science that impacts the submerged jumping condition for scuba jumpers is Boyle's law.
The law states that as weight changes, the volume of gases in a jumper's body pits and adaptable gear changes as well. Where the water weight builds, 'air spaces' reduces in size, yet as water weight diminishes, the 'air spaces' increments in size. Where the two changes are in direct extent to the weight increment or lessening, the temperature is held consistent.
The reaction 3o2 -> 2o3 has a rate of change of o2 concentation equal to -0.90 mol/l*s. what is the rate of change of o3 concentration
Answer:
0.6 mol/L.s.
Explanation:
For the reaction:3O₂ → 2O₃,
the rate of the reaction = - 1/3d[O₂]/dt = 1/2d[O₃]/dt
where, d[O₂]/dt is the rate of change of O₂ concentation = - 0.9 mol/L.s.
d[O₃]/dt is the rate of change of O₃ concentration.
∴ d[O₃]/dt = - 2/3(d[O₂]/dt) = - 2/3(- 0.9 mol/L.s) = 0.6 mol/L.s.
A gas occupies a volume of 2.4 L at 14.1 kPa. What volume will the gas occupy at 84.6 kPa?
Answer:
0.40 LExplanation:
Boyle's law for gases states that, at constant temperature, the volume and pressure of a fixed amount of gas are inversely related.
Mathematically, that is:
PV = constantP₁V₁ = P₂V₂Here, you have:
V₁ = 2.4 LP₁ = 14.1 KpaP₂ = 84.6 KPaV₂ = ?Then, you can solve for V₂:
V₂ = P₁V₁ / P₂Substitute and compute:
V₂ = 14.1 KPa × 2.4L / 84.6 KPa = 0.40 L ← answerAnswer:
0.40 L
Explanation:
How much heat energy is added to 2 grams of water if the initial temperature was 40°C and the final temperature is 50°C? (The specific heat of water is 4.18 J/g°C).
To calculate the amount of heat energy added to the water, multiply the mass of water by the specific heat of water and the change in temperature.
Explanation:To calculate the amount of heat energy added to the water, we can use the equation:
q = m * c * ΔT
Where q is the heat energy, m is the mass of the water (2 grams), c is the specific heat of water (4.184 J/g °C), and ΔT is the change in temperature (final temperature minus initial temperature).
Substituting the values into the equation, we get:
q = 2g * 4.184 J/g°C * (50°C - 40°C)
q = 2g * 4.184 J/g°C * 10°C
q = 83.68 J
Therefore, 83.68 Joules of heat energy is added to 2 grams of water.
** WILL MARK BRAINLIEST **
How many liters of 4.0 M NaOH solution will react with 0.30 liters 4.0 M H2SO4?
H2SO4 + NaOH → Na2SO4 + H2O
A. 1.6 L
B. 1.2 L
C. 0.90 L
D. 0.60 L
Answer:
D. 0.60 L.
Explanation:
For the acid-base neutralization, we have the role:The no. of millimoles of acid is equal to that of the base at the neutralization.
∴ (XMV) NaOH = (XMV) H₂SO₄.
X is the no. of reproducible H⁺ (for acid) or OH⁻ (for base),
M is the molarity.
V is the volume.
For NaOH:X = 1, M = 4.0 M, V = ??? L.
For H₂SO₄:X = 2, M = 4.0 M, V = 0.3 L.
∴ V of NaOH = (XMV) H₂SO₄/(XM) NaOH = (2)(4.0 M)(0.3 L)/(1)(4.0 M) = 0.6 L.
So, the right choice is: D. 0.60 L.
What effect does the addition of a catalyst have on a chemical reaction at equilibrium?
Answer:it speeds up the reaction
Explanation:
What type of compound is always an electrolyte? A. Nonpolar covalent B. Polar covalent C. Network solid D. Ionic
The answer is d ionic
Which formula can be used to calculate the actual yield?
(Percent yield × theoretical yield) ÷ 100
(Percent yield ÷ theoretical yield) × 100
(Theoretical yield ÷ percent yield) × 100
(Theoretical yield × amount of reactants) ÷ 100
Answer:
(Percent yield × theoretical yield) ÷ 100.
Explanation:
∵ percent yield of the reaction = [(actual yield)/(theoretical yield)] x 100.
∴ actual yield = [(percent yield of the reaction) x (theoretical yield)]/100.
So the right choice is: (Percent yield × theoretical yield) ÷ 100 .
Answer : The correct option is, [tex]\frac{(\text{Percent yield}\times \text{Theoretical yield})}{100}[/tex]
Explanation :
The formula used for the percent yield will be :
[tex]\text{Percent yield}=\frac{\text{Actual yield}}{\text{Theoretical yield}}\times 100[/tex]
or,
[tex]\text{Actual yield}=\frac{(\text{Percent yield}\times \text{Theoretical yield})}{100}[/tex]
For example : If we are given that the percentage yield of a sample is 94.92% and the theoretical yield is 83.475 g. Now calculate the actual yield of the sample.
By using formula we get the value of actual yield.
[tex]\text{Actual yield}=\frac{(94.92\times 83.475)}{100}=79.23g[/tex]
Thus, the actual yield is, 79.23 g.
Hence, the formula used to calculate the actual yield can be, [tex]\frac{(\text{Percent yield}\times \text{Theoretical yield})}{100}[/tex]
What condition must be satisfied by a balanced chemical equation?
Answer:
The chemical equation needs to be balanced so that it follows the law of conservation of mass. A balanced chemical equation occurs when the number of the different atoms of elements in the reactants side is equal to that of the products side. Balancing chemical equations is a process of trial and error.
Explanation:
1.A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium. How much calcium is contained in 40.0 g of calcium fluoride? 2.Silver has two isotopes. One isotope contains 60 neutrons and has a percent abundance of 51.839% the other contains 62 neutrons. Give the atomic symbols for the two isotopes.3.What is the average atomic weight of silver? What is the mass (in grams) of a single chlorine molecule? 4.How many moles of ethanol (CH_3CH_2OH) are in 141 mg?
These are five questions and five answers.
1) Question 1. A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium. How much calcium is contained in 40.0 g of calcium fluoride?
Answer:
20.5 g CaExplanation:
Calcium fluoride being a pure substance, has a fixed chemical compositon, which means that their elements (atoms), in any sample, are always in the same proportion.
Then, you can set the followoing proportion:
7.70 g Ca / 15.0 g CaF₂ = x / 40.0 g CaF₂Now, solve for x:
x = 40.0 g CaF₂ × 7.70 g Ca / 15.0 g CaF₂ = 20.5 g Ca.The answer must be expressed with 3 significan figures, since the three data are given with 3 significan figures.
2) Question 2. Silver has two isotopes. One isotope contains 60 neutrons and has a percent abundance of 51.839% the other contains 62 neutrons. Give the atomic symbols for the two isotopes.
Answer:
Isotope that contains 60 neutrons: ¹⁰⁷₄₇AgIsotope that contains 62 neutrons: ¹⁰⁹₄₇AgExplanation:
Isotopes are atoms of the same element, with different number of neutrons, so all the isotopes of an element have the same atomic number, Z (number of protons) and different mass number A (number of neutrons + protons).The atomic symbols for isotopes uses the chemical symbol of the atom (Ag for silver); a subscript to the left of the chemical symbol that represents the atomic mass (47 for silver); and a superscript to the left of the chemical symbol that represents the mass number.The mass number, A, for each silver isotope is calculated in this way:
Isotope that contains 60 neutrons: A = 60 + 47 = 107
Isotope that contains 62 neutrons: A = 62 + 47 = 109
Then, the respective atomic symboles are:Isotope with 60 neutrons: ¹⁰⁷₄₇Ag
Isotope with 62 neutrons: ¹⁰⁹₄₇Ag
3) Question 3. What is the average atomic weight of silver? What is the mass (in grams) of a single chlorine molecule?
Answer:
107.96 amuExplanation:
The atomic wieght of the elements is the weighted average weight of the different isotopes of the same element found in the nature, taking into account their relative abundance.
Average atomic weight = ∑( abundance × individual atomic weight)
Average atomic weight of silver = (abundace of isotope 1 × atomic weight isotope 1) + (abundance isotope 2 × atomic weight isotope 2)Abundance isotope 1 = 51.839%Atomic weight isotope 1 = mass number = 60 neutrons + 47 protons = 107 a.m.uAbundance isotope 2 = 100% - 51.839% = 48.161%Atomic weight isotope 2 = 62 neutrons + 47 protons = 109 a.m.u.Average atomic weight of silve = 107 amu × 51.839% + 109 amu × 48.161% = 107.96 amu4) Question without number: What is the mass (in grams) of a single chlorine molecule
Answer:
1.177 × 10⁻²² gExplanation:
The chlorine molecule is diatomic. That means that each molecule contains two atoms. The chemical formula of chlorine molecule is Cl₂.
The mass of one mole of molecules of Cl₂ is 2 × 35.453 g/mol = 70.906 g/mol
Mass of a single molecule = mass of one mol / number of molecules in one molMass of a single molecule = 70.906 g/mol / (6.022 × 10²³ molecules / mol)Mass of a single molecule = 11.77 × 10⁻²³ g = 1.177 × 10⁻²² g5) Question 4. How many moles of ethanol (CH₃CH₂OH) are in 141 mg?
Answer:
0.00301 molExplanation:
Molar mass of CH₃CH₂OH = 2 × 12.011 g/mol + 6 × 1.008 g/mol + 15.999 g/mol = 46.069 g/mol.Formula: number of moles = mass in grams / molar massCalculation: number of moles = 141 mg × ( 1 g /1000 mg) / (46.069 g/mol = 0.00301 molIn 40.0 g of calcium fluoride, there is 20.53 g of calcium. Silver has two isotopes represented by Ag-107 and Ag-109, with the average atomic weight of silver calculated by using their percent abundances. For ethanol, 141 mg corresponds to 0.00306 moles.
Calcium is contained in 40.0 g of calcium fluoride (CaF₂), we use a proportional relationship based on the information provided:
15.0 g of CaF₂ contains 7.70 g of calcium.
40.0 g of CaF₂ contains X g of calcium.
By setting up a proportion, we solve for X:
(7.70 g Ca / 15.0 g CaF₂) = (X g Ca / 40.0 g CaF₂)X = (7.70 g Ca / 15.0 g CaF₂)
40.0 g CaF₂)
X = 20.53 g of calcium.
The atomic symbols for the two isotopes of silver are: Ag-107 (47 protons + 60 neutrons) and Ag-109 (47 protons + 62 neutrons).
The average atomic weight of silver is calculated considering the weighted average of these isotopes and their percent abundances. The mass of a single chlorine molecule (Cl₂), not a chlorine atom, would be the sum of the atomic masses of the two chlorine atoms. However, the specific mass for a single molecule of Cl₂ in grams is a very small number, given that it's typically calculated in atomic mass units.
Finding the number of moles of ethanol (CH₃CH₂OH) in 141 mg:
The molar mass of ethanol is approximately 46.07 g/mol. Therefore:(141 mg) (Unit conversion from mg to g: 141 mg * (1 g/ 1000 mg)) (Divide by the molar mass of ethanol: (0.141 g) / 46.07 g/mol) = 0.00306 mol of ethanol.
Which formula equation shows a reversible reaction? a. 2Na+F2–> 2NaF b. CaCO3–> CaO+CO2 c. NH4CI(s)—–NH3(g.+HCI(g. 2H2O2(aq)–pt—> 2H2O(I)+O2(g.?
Answer:
The choice c. NH₄CI(s) ⇄ NH₃(g) + HCI(g) is the reversible reaction.Explanation:
The formula equations given are:
a. 2Na + F₂ → 2NaF b. CaCO₃ → CaO + CO₂ c. NH₄CI(s) ⇄ NH₃(g) + HCI(g)d. 2H₂O₂(aq) → 2H₂O(I)+O₂(g)
[there is also a Pt symbol over the arrow, which means that Pt
is a catalyst]
Reversible reactions are reactions that may happen in both directions, i.e. there is a direct or forward reaction and a reverse reaction.
The symbol used to show a reversible reaction is the double arrow (⇄).
The double arrow shows tha both left side substances and right side substances are reactants and products.
In the reaction NH₄CI(s) ⇄ NH₃(g) + HCI(g) you have:
NH₄CI(s) → NH₃(g) + HCI(g) is the direct reaction. In this, NH₄CI(s) is the reactant and NH₃(g) + HCI(g) are the products.NH₄CI(s) ← NH₃(g) + HCI(g) (notice the arrow goes from right to left) is the reverse reaction. In this, NH₄CI(s) is the product and both NH₃(g) and HCI(g) are the reactants.All the other equations are written with a single arrow, so they are not reversible reactions.
Answer:
just did edge test, got 100%:
C. NH4Cl(s)<-->NH3(g) + HCl(g)
[GT.02]Which of these forces in carbon-14 isotopes transforms a neutron into a proton?gravitational forceselectromagnetic forcesweak nuclear forcesstrong nuclear forces
Answer:
The weak nuclear force.
Explanation:
This force is active in radioactivity.
Recently you viewed a movie in which a spaceship blows up outside a space station. The people inside the space station jump with surprise upon hearing the explosion. What is wrong with this scenario? Sound is a transverse wave. Sound needs a medium through which to travel. Sound is a longitudinal wave. There are no such things as space stations. NEXT
Answer:
Sound needs a medium through which to travel.
Explanation:
In space there is no air or medium. Sound waves need medium to travel. It cannot travel through vacuum. Sounds waves are mechanical waves unlike electromagnetic waves. Electromagnetic waves can travel through vacuum. But mechanical waves such as sound waves needs a medium to propagate the energy. So it is very unlikely that people inside the space station can hear the explosion that occurs in space outside the space station.
Which describes a radioactive substance?
A. A substance whose nuclei do not stay together
B. A substance that generates radio-wave frequencies
C. A substance that forms positive or negative ions
D. A substance that forms weak molecular bonds
Answer: I believe the Answer is A
Answer:
a substance whose nuclei do not stay together
Explanation:
Select true or false: if the ph of pure water is 7.0, the hydroxide ion concentration in pure water is 1 × 10–7 m.
Answer:
True
Explanation:
as the ph of pure water is 7
(-)log(10^-7) = 7
The statement if the pH of pure water is 7.0, the hydroxide ion concentration in pure water is 1 × 10⁻⁷M is true.
How do we calculate the hydroxide ion concentration?Hydroxide ion concentration in the solution will be calculated by using the below equation as:
pOH = -log[OH⁻]
Relation between pH and pOH is :
pH + pOH = 14
Given that, pH = 7
So, pOH = 14 - 7 = 7
By using first equation, we have
7 = -log[OH⁻]
[OH⁻] = 10⁻⁷M
Hence, hydroxide ion concentration in pure water is 1×10⁻⁷M.
To know more about pH & pOH, visit the below link:
https://brainly.com/question/17144456
#SPJ2
how many grams are in 2.3 x10-4 moles of calcium phosphate ca3(po3)2
Final answer:
To find the number of grams in 2.3 x 10-4 moles of calcium phosphate (Ca3(PO4)2), you need to calculate the molar mass of calcium phosphate and then convert moles to grams.
Explanation:
To find the number of grams in 2.3 x 10-4 moles of calcium phosphate (Ca3(PO4)2), we need to calculate the molar mass of calcium phosphate and then convert moles to grams.
The molar mass of Ca3(PO4)2 can be calculated by adding the atomic masses of calcium (Ca), phosphorus (P), and oxygen (O). The atomic masses are: Ca = 40.078 g/mol, P = 30.973761 g/mol, O = 15.9994 g/mol.
Calculating the molar mass:
3Ca: (3 atoms) (40.078 g/mol/atom) = 120.234 g/mol2P: (2 atoms) (30.973761 g/mol/atom) = 61.947522 g/mol8O: (8 atoms) (15.9994 g/mol/atom) = 127.9952 g/molTotal molar mass of Ca3(PO4)2 = 120.234 g/mol + 61.947522 g/mol + 127.9952 g/mol = 310.176722 g/mol.
Now, we can use the equation:
mass(g) = moles x molar mass(g/mol)
Substituting the given values:
mass(g) = 2.3 x 10-4 moles x 310.176722 g/mol
Calculating the result:
mass(g) = 0.0712 g
Therefore, there are 0.0712 grams in 2.3 x 10-4 moles of calcium phosphate (Ca3(PO4)2).
Which of the following is true of an exothermic reaction? Choose the 4 that apply.
Answer:
heat is relaesed
a decrease in temperature
less than the chemical energy
written as a reactant
Explanation:
Answer:
Answer is Below
Explanation:
For an exothermic reaction, heat is released. Which means that...
1. Heat is written as a product of the reaction.
2. A rise in temperature occurs.
3. Heat is released into the surroundings.
and 4. The chemical energy stored in the bonds of the products is less than that stored in the reactants.
This diagram also explains why this is the case, the chemical energy is lower as you see the products is lower on the graph as compared to the reactants.
Which list of solutions is arranged in order from highest boiling point to lowest boiling point?
A 2.0 BaCl2
B 2.0 NaNO3
C 1.0 C6H12O6
D 1.0 K2SO3
Answer:
A) 2.0 BaCl₂ > B) 2.0 NaNO₃ > D) 1.0 K₂SO₃ > C) 1.0 C₆H₁₂O₆Explanation:
The boiling point of a pure solven increases when a solute is added and a solution is formed.
The increase of the boiling point of a solvent, when a non-volatile solute is added, is a colligative property, meaning that it depends of the number particles of solute dissolved.
The equation that rules the increase of the boiling point is:
ΔTb = Kb × m × iWhere:
ΔTb is the increase in the boiling point of the solvent,Kb is the boiling molal constant of the solvent, andi is the Vant' Hoff factor, which accounts for the number of ions when the solute is a ionic compound.Then, since Kb is constant (because it is the same solvent for all the solutions), you must look at the product m × i.
For ionic solutes you assume 100% ionization, which drives to:
Solution Ionization i m m × i
A) 2.0 BaCl₂ Ba⁺² + 2Cl⁻ 3 2.0 6.0 ↔ highest
B) 2.0 NaNO₃ Na⁺ + NO₃⁻ 2 2.0 4.0 ↔ second
C) 1.0 C₆H₁₂O₆ none 1 1.0 1.0 ↔ lowest (fourth)
D) 1.0 K₂SO₃ 2K⁺ + SO₃²⁻ 3 1.0 3.0 ↔ third
Then, 6.0 > 4.0 > 3.0 > 1.0 and the final list of the solutions arranged in order from highest boiling point to lowest boiling point is:
2.0 BaCl₂ > 2.0 NaNO₃ > 1.0 K₂SO₃ > 1.0 C₆H₁₂O₆Answer:
The order should be ABDC.
Explanation:
Metals and nonmetals can react with each other to form ions. Complete these statements.A potassium atom gains or loses (electrons/protons/neutrons) and forms how many ion?A sulfur atom gains or loses (electrons/protons/neutrons) and forms how many ion?
A potassium atom loses one electron to form a potassium ion with a +1 charge, while a sulfur atom gains two electrons to form a sulfide ion with a -2 charge.
Explanation:Metals and nonmetals can react with each other to form ions through the transfer of electrons. When a potassium atom reacts, it loses one electron and forms a potassium ion with a +1 charge (K+). Potassium is an alkali metal and it typically loses one electron to achieve a noble gas electron configuration.
On the other hand, a sulfur atom typically gains two electrons to form a sulfide ion with a -2 charge (S2-). As a nonmetal, sulfur gains electrons to achieve an octet, resembling the electron configuration of a noble gas.
Solid magnesium has a specific heat of 1.01 J/g°C. How much heat is given off by a 20.0 gram sample of magnesium when it cools from 70.0°C to 50.0°C?
Answer:
404 J
Explanation:
The amount of heat given off by the magnesium sample is given by:
[tex]Q=mC_s \Delta T[/tex]
where
m = 20.0 g is the mass of the sample
[tex]C_s = 1.01 J/gC[/tex] is the specific heat capacity of the magnesium
[tex]\Delta T=50.0 C-70.0 C=-20.0^{\circ}[/tex] is the change in temperature
Substituting into the equation, we find
[tex]Q=(20.0 g)(1.01 J/gC)(-20.0^{\circ})=-404 J[/tex]
and the negative sign means the heat is given off by the sample.
Using the formula for heat exchange (q = mcΔT), we find that a 20.0 gram sample of magnesium releases 404 Joules of heat when cooling from 70.0°C to 50.0°C
Explanation:The student's question involves the physics concept of specific heat. Specific heat is the heat required to change the temperature of 1 gram of a substance by 1 degree Celsius, it's an intensive property. To calculate the amount of heat given off you can use this formula: q = mcΔT, where:
q is the heat exchanged,m is the mass of the substance,c is the specific heat, andΔT is the difference in temperature.For the given problem, the mass (m) of magnesium is 20.0 grams, its specific heat (c) is 1.01 J/g°C and the change in temperature (ΔT) is 70.0°C - 50.0°C = 20.0°C. So,
q = mcΔT
= (20.0 g) * (1.01 J/g°C) * (20.0°C)
= 404 J
Therefore, 404 Joules of heat is released when the 20.0 gram sample of magnesium cools from 70.0°C to 50.0°C.
Learn more about Specific Heat here:https://brainly.com/question/28852989
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1. For most of the 17 years in which he was active, the identity of the Unabomber remained a mystery.
True False
2. Polygraph machines measure physical changes in the body when the individual is asked 'yes' and 'no' questions.
True
False
3.False positives occur when the examinee tells the truth but his response is recorded as a lie.
True
False
Answer they are all true.
Explanation:
The Unabomber had no identity until he finally confessed in 1998. Therefore, the answer is true, (its almost like a trick question.)
The Polygraph machine does measure physical changes in the body, so the answer is true.
False positives are when the examinee tells a truth but it is recorded as a lie.