there are 12 grams in 6.02x10^23 molecules of Na(NO3)3?
What is the sum of protons and neutrons in an atomic nucleus?
A: Mass Number
B: Charge Number
C: Balance Number
D: Atomic Number
It is the atomic number. So it is D.
What is the percent concentration of a sodium fluoride solution made by dissolving 65.4 grams of sodium fluoride in 125.1 grams of water?
Answer:
34.33 %.
Explanation:
To calculate the mass percent or weight percent of a solution, you must divide the mass of the solute by the mass of the solution (both the solute and the solvent together) and then multiply by 100 to change it into percent.W% = [(W of solute NaF)/(W of solution)] x 100.
W of solute NaF = 65.4 g.
W of solution = W of solute NaF + W of water = 65.4 g + 125.1 g = 190.5 g.
∴ W% = [(W of solute NaF)/(W of solution)] x 100 = [(65.4 g)/(190.5 g)] x 100 = 34.33 %.
Which of the following is a subsurface event that takes place during the rock cycle? (6 points)
Cementing
Erosion
Melting
Weathering
Answer: the answer is letter c. melting
Answer:
C melting
Explanation: we can eliminate 2 right off the bat eroison and weathering you can eliminate them because their above ground and subsurface means below the surface. You eliminate cementing because it wants in the deeper section of the earth.
Inferences are A. never made by scientists. B. questions that are made by studying conclusions or predictions. C. exactly the same as observations. D. conclusions or predictions that are made by studying observations.
The Answer Is D. Have A Great Day
you are holding a bowling ball with a mass of 6 kg at a height of 1 meter. How much gravitational potential energy does the bowling ball have?
The formula for GPE is PE=mgh, where “m” is the mass of the object, “g” is the acceleration due to gravity (~9.8 m/s^2 on Earth’s surface), and “h” is the height of the object from the ground. Therefore,
PE=mgh
PE=(6 kg)(9.8 m/s^2)(1 m)
PE=58.8 kg•m^2/s^2 or 58.8 Newtons
The GPE of the bowling ball under these conditions would be about 59 Newtons.
Hope this helps!
what is the molarity of a solution that contains 0.400 mol HCI in 9.79 L solutions
Molarity's formula is known as: Molarity(M)=moles of solute/liters solution.
In this case we are already given moles and liters so you just have to plug the numbers into the equation.
0.400 mol HCL/9.79L solution=0.040858M
If you were to use scientific notation, the answer will be: 4.1*10^-2, but otherwise, you can just use the decimals above and round appropriately as you see fit.
Final answer:
To calculate the molarity of a solution with 0.400 mol of HCl in 9.79 L, divide the moles by the volume, resulting in a molarity of 0.0409 M.
Explanation:
The question asks how to calculate the molarity of a hydrochloric acid (HCl) solution. Given that the solution contains 0.400 mol of HCl and has a total volume of 9.79 liters, we can use the definition of molarity. Molarity is defined as the number of moles of solute (in this case, HCl) divided by the volume of the solution in liters.
To find the molarity, we perform the following calculation:
Molarity = moles of solute / liters of solution
Molarity = 0.400 mol / 9.79 L
This gives us a molarity of:
0.0409 M
Therefore, the molarity of the HCl solution is 0.0409 M.
Calculate the molarity of a solution in which 212.5g of NaNO3 are contained in 3.0 liters of solution.
Molarity's formula is: moles solute/liters solution.
In this question, we are given grams of solute so we have to convert that to moles.
NaNO3 has a molar mass of 84.9947g/mol. Here we begin with the given 212.5g and multiplying it by 1mol/84.9947g because the grams have to cancel out to give moles.
[tex](212.5 grams NaNO3)/(\frac{1 mole NaNO3}{84.9947 grams NaNO3} ) =2.5 moles NaNO3[/tex]
Now that we have moles of solute, we just plug it into the formula.
2.5 mols NaNO3/3L solution=0.8333 M of solution
The molarity of the solution containing 212.5 g of NaNO₃ in 3 L of solution is 0.83 M
What is molarity?This is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
How to determine the mole of NaNO₃ Mass of NaNO₃ = 212.5 g Molar mass of NaNO₃ = 23 + 14 + (3×16) = 85 g/mol Mole of NaNO₃ =?Mole = mass / molar mass
Mole of NaNO₃ = 212.5 / 85
Mole of NaNO₃ = 2.5 mole
How to determine the molarity Mole of NaNO₃ = 2.5 mole Volume = 3 L Molarity =?Molarity = mole / Volume
Molarity = 2.5 / 3
Molarity = 0.83 M
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In France, grapes are 1.75 Euros per kilogram. What is the cost of grapes in dollars per pound if the exchange rate is 1.36 dollars to 1 Euro? ( Hint: covert 1 until at a time.) ( Remember: 1 1b =454g)
Answer:
$1.08/lb
Explanation:
You want the cost in dollars per pound of grapes that cost €1.75 per kg, given the exchange rate €1 = $1.36.
Unit conversionWe can multiply by a ratio that cancels units we don't want and leaves units we do want.
[tex]\dfrac{1.75 \text{ euro}}{1\text{ kg}}\times\dfrac{0.454\text{ kg}}{1\text{ lb}}\times\dfrac{\$1.36}{1\text{ euro}}\approx\boxed{\$1.08\text{ per lb}}[/tex]
Explain why the temperature of ocean water will vary with latitude and depth.
The latitude changes the climate, so if the ocean water is in the Antarctic Ocean, it will most likely be cold. The depth of the ocean water matters because it determines the amount of sunlight that the water receives therefore heating it.
Three metal spheres are placed next to each other as shown in the picture. A has two times the mass of B. C has one-third the mass of A. The distance between A and C is half that between A and B. Given these conditions, which statement is true?
You didn’t list the statements.
Answer:
The answer is C. I just had this question.
Explanation:
Using enthalpies of formation, calculate H.
ΔH° = -851.5 kJ/mol given that
[tex]\begin{array}{cc}\textbf{Species}&{\bf {\Delta H_f\textdegree{}}}\\ \text{Fe}_2\text{O}_3\;(s) & -824.2\;\text{kJ}\cdot\text{mol}^{-1}\\\text{Al}_2\text{O}_3\;(s) & -1675.7\;\text{kJ}\cdot\text{mol}^{-1}\end{array}[/tex]
(Source: Chemistry Libretexts.)
ExplanationRefer to a thermodynamic data table for the standard enthalpy of formation for each species.
Don't be alerted if the data for Al (s) and Fe (s) are missing. Why?
The standard enthalpy of formation of a substance measures the ΔH required to form each mole of it from the most stable allotrope of its elements under STP. Both Al (s) and Fe (s) are already the most stable form of their element under STP (note that the state symbol matters.) There's no need to form them again.As a result, [tex]\Delta H_f\textdegree{} = 0[/tex] for both Al (s) and Fe (s).
[tex]\displaystyle \Delta H_{\text{rxn}}\textdegree{} = \text{Sum of }\Delta H\text{ for all }\textbf{Product} - \text{Sum of }\Delta H\text{ for all }\textbf{Reactant}}\\\phantom{\Delta H_{\text{rxn}}\textdegree{}} = (1\times \Delta H_f\textdegree{}(\text{Al}_2\text{O}_3\;(s)) + 1\times \Delta H_f\textdegree{}(\text{Al}\;(s)) \\ \phantom{\Delta H_{\text{rxn}}\textdegree{}=}-(1\times \Delta H_f\textdegree{}(\text{Fe}_2\text{O}_3\;(s)) + 1\times\Delta H_f\textdegree{}(\text{Fe}\;(s))[/tex]
[tex]\Delta H_{\text{rxn}}\textdegree{}} = (1 \times (-1675.7)) - (1\times(-824.2)) = -851.5\;\text{kJ}\cdot\text{mol}^{-1}[/tex].
The number "1" here emphasizes that in case there are more than one mole of any species in one mole of the reaction, it will be necessary to multiply the [tex]\Delta H_f\textdegree{}[/tex] of that species with its coefficient in the equation.
Which of the following is a physical property? A. Flammability B. Heat of combustion C. Solubility D.Toxicity
Answer: Option (C) is the correct answer.
Explanation:
A property that does not cause any difference in the chemical composition of the atom is known as a physical property.
For example, boiling point, mass, density, melting point, solubility etc are physical properties.
On the other hand, a property that that cause difference in the chemical composition of a substance is known as a chemical property.
For example, combustion, toxicity, flammability etc are chemical properties.
Therefore, we can conclude that out of the given options solubility is a physical property.
Solubility out of the following is a physical property. Therefore, the correct option is option C.
A physical property is a characteristic that does not alter the chemical makeup of an atom in any way. Physical attributes include things like melting point, solubility, mass, density, and boiling point. At the other hand, a chemical property is a characteristic that alters a substance's chemical make-up. Chemical attributes include things like combustion, toxicity, flammability, etc. Solubility out of the following is a physical property.
Therefore, the correct option is option C among all the given options.
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Freezing water into ice is a ____ change
Physical
Chemical
Nuclear
physical change because it is just changing the state of matter. SOLID into LIQUID
Given 6.98 x 10 4 power grams of iron, calculate the moles of iron present
Answer:
1249.88 mol.
Explanation:
∵ no. of moles of Fe = mass of Fe/atomic weight of Fe.
∴ no. of moles of Fe = (6.98 x 10⁴ g)/(55.845 g/mol) = 1249.88 mol.
The reactants side of an equation is shown. How many silver atoms should the products side of the equation have after a chemical reaction?
2 A g 2 O
⟶
?
3
2
1
4
I was thinking 2 but im not sure.
A water molecule is made up of two hydrogen (H) atoms and one oxygen (O) atom. In a chemical equation, what would be the correct way to represent six water molecules?
6 H (2) O
H (12) O (6)
6 H (2) O (2)
2 H (6) O (3)
6H(2)O?
Carbon atoms form ____ (2,3,4) bonds with other atoms by _____ (gaining, losing, sharing) valence electrons in order to attain a stable configuration
Answer : Carbon atoms form 4 bonds with other atoms by sharing valence electrons in order to attain a stable configuration.
Explanation :
The given element is, Carbon
The element carbon with symbol (C) having the atomic number 6 and the atomic mass 12.
The number of electrons in carbon atom is, 6
The electronic configuration of carbon will be, [tex]1s^22s^22p^2[/tex]
The number of valence electrons in carbon atom = 2 + 2 = 4
That means carbon atom have the ability to form four bonds with the other atoms by the sharing of four valence electrons in order to achieve a stable electronic configuration.
For example : Carbon atom share their four valence electrons with four hydrogen atoms that has one valence electron to form a methane molecule, [tex]CH_4[/tex] and carbon and hydrogen are bonded by the covalent bond.
Carbon atoms form 4 bonds with other atoms by sharing valence electrons in order to attain a stable configuration.
Each element has a given "electronic configuration", in its ground state, and elements with similar external electronic configurations behave similarly in many respects.
The main characteristic of the carbon atom is concatenation, that is, the ability to bond or unite with itself, forming large chains or very stable rings.
The carbon atom forms four covalent bonds, sharing its four valence bonds, they can be single, double or triple.Carbon when tetrahedrally linked by four simple bonds to four other carbons or hydrogens, does not have unshared pairs of electrons and therefore is not susceptible to attack by electron deficient atoms.Therefore, we can conclude that carbon atoms form 4 bonds with other atoms by sharing valence electrons in order to attain a stable configuration.
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Nitrogen and oxygen are _____ gases in the atmoshere.
Trace
Variable
Primary
Rare
Nitrogen and oxygen are primary gases in the atmosphere.
Trace
Variable
Primary
Rare
They are he Primary gasses in the atmosphere with the percentages being 78% nitrogen, 21% oxygen
hope this has helped
hat is the % of each element in the compound Mg3(PO4)2?
1. First calculate the total molar mass of the entire compound.
Mg = 3 x 24.31 = 72.93 g/mol
P = 2 x 30.97 = 61.94 g/mol
O = 8 x 16.00 = 128.00 g/mol
* Add them up;
72.93 + 61.94 + 128.00 = 262.87 g/mol
2. Take the individual masses of each element that you calculated, divide them by the total mass (262.87 g/mol) and then multiply by 100.
Mg = 72.93/262.87 = 0.2774 x 100 = 27.74%
P = 61.94/262.87 = 0.2356 x 100 = 23.56%
O = 128.00/262.87 = .4870 x 100 = 48.70%
3. All of the percentages should add up to equal 100%.
* Hope this helps
1. Firstly we have to calculate the total molar mass of the entire compound.
Then Mg = 3 x 24.31 = 72.93 g/molThen P = 2 x 30.97 = 61.94 g/molAfter that O = 8 x 16.00 = 128.00 g/molThen Add them up;Also that when 72.93 + 61.94 + 128.00 = 262.87 g/mol
2. Now we have to Take the individual masses of each element that you calculated, then divide them by the total mass (262.87 g/mol), and also then multiply by 100.
After that Mg = 72.93/262.87 = 0.2774 x 100 = 27.74%Then P = 61.94/262.87 = 0.2356 x 100 = 23.56%Then O = 128.00/262.87 = .4870 x 100 = 48.70%3. Thus All of the percentages should add up to equal 100%.
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PLEASE HELP ASAP ONE MORE QUESTION !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Which of the following is a direct result of technological advances in farming techniques?
A.
The United States can produce enough food to feed all the people in the world.
B.
The average life expectancy in the United States is beginning to decrease.
C.
Heart disease is the leading cause of death in industrialized countries.
D.
The percent of the population with type II diabetes has increased in the past few decades.
A. The United States can produce enough food to feed all the people in the world. is your best answer, and is the only logical answer.
It is the only answer that actually has the word "food" in it, and is a direct result of farming technological advances.
~
A 200 g sample of water with a temperature of 32◦C is added to 50 g water at 55◦C in an insulated container. What is the final temperature after thermal equilibrium is reached? The specific heat of water in the liquid state is 4.18 J/g◦C, in the solid state is 2.09 J/g◦C, and in the gaseous state is 2.03 J/g◦C. The heat of fusion is 334 J/g and the heat of vaporization is 2260 J/g. 1. 49.2◦C 2. 36.6◦C 3. 52.6◦C 4. 38.4◦C 5. 50.4◦C 6. 43.5◦C 7. 34.1◦C
Final answer:
The final temperature after thermal equilibrium is reached is approximately 46.6°C.
Explanation:
To find the final temperature after thermal equilibrium is reached, we can use the principle of conservation of energy. The heat gained by the cool water is equal to the heat lost by the hot water.
Let's denote the final temperature as T. The heat gained by the cool water can be calculated using the equation q = m * c * ΔT, where q is the heat gained, m is the mass of the cool water, c is the specific heat of water, and ΔT is the change in temperature. The heat lost by the hot water can be calculated using the same equation. Setting the two equations equal to each other and solving for T will give us the final temperature.
Using the given values, we can calculate:
qcool = (200 g) * (4.18 J/g°C) * (T - 32°C)
qhot = (50 g) * (4.18 J/g°C) * (55°C - T)
Setting qcool equal to qhot:
(200 g) * (4.18 J/g°C) * (T - 32°C) = (50 g) * (4.18 J/g°C) * (55°C - T)
Simplifying and solving for T:
800(T - 32°C) = 50(55°C - T)
T = 46.6°C
Therefore, the final temperature after thermal equilibrium is reached is approximately 46.6°C.
Consider the following equilibrium reaction having gaseous reactants and products. 4HCl + O2 ⇌ 2H2O + Cl2 Which of the following would result from increasing the volume of oxygen?
B.The rate of forward reaction increases.
Explanation;Le Chatelier's principle states that changing a factor such as concentration, temperature, or pressure of a reaction at equilibrium will cause the reaction to shift in the direction that counteracts the effect of that change.Therefore, when reactants are added to a reaction at equilibrium shift when more reactants are added then the reaction shifts to the right to make more products.Answer: B) The rate of forward reaction increases.
Difluoromethane has the formula CH2F2- this compound can be classified as
A.) covalent,because it contains carbon and hydrogen
B.) ionic, because it contains Fluorine ions
C.) covalent because it contains only nonmetal
D.)ionic, because it contains both hydrogen (a metal )and nonmetals
The answer is C because it is between nonmetals
When 412.5g of calcium carbonate react with 521.9g of aluminum fluoride,how many grams of each product can be produced
321.8 g CaF2
321.5 g Al2(CO3)3
Explanation;The equation for the reaction is;
3 CaCO3 + 2 AlF3 → 3 CaF2 + Al2(CO3)3
Number of moles of CaCO3 will be;
=(412.5 g CaCO3) / (100.0875 g CaCO3/mol)
= 4.12139 mol CaCO3
Number of moles of AlF3 will be;
= (521.9 g AlF3) / ( 83.9767 g AlF3/mol)
= 6.21482 mol AlF3
But;
4.12139 moles of CaCO3 would react completely with 4.12139 x (2/3) = 2.74759 moles of AlF3.
Thus; there is more AlF3 present than that, so AlF3 is in excess, and CaCO3 is the limiting reactant.
Therefore;
Mass of CaF2 will be;
(4.12139 mol CaCO3) x (3/3) x (78.0752 g CaF2/mol) = 321.8 g CaF2
Mass of Al2(CO3)3 on the other hand will be;
(4.12139 mol CaCO3) x (1/3) x (233.9903 g Al2(CO3)3/mol) = 321.5 g Al2(CO3)3
When 412.5 g of calcium carbonate reacts with 521.9 g of aluminum fluoride, approximately 322.1 g of CaF₂ and 345.5 g of Al₂(CO₃)₃ can be produced.
The reaction is:
CaCO₃ + AlF₃ → CaF₂ + Al₂(CO₃)₃
First, let's write the balanced equation:
3CaCO₃ + 2AlF₃ → 3CaF₂ + Al₂(CO₃)₃
Now, let's calculate the number of moles of each reactant:
n(CaCO₃) = 412.5 g / 100.09 g/mol = 4.12 mol n(AlF₃) = 521.9 g / 83.98 g/mol = 6.22 mol
Since the reaction requires 3 moles of CaCO₃ for every 2 moles of AlF₃, the limiting reactant is CaCO₃.
Now, let's calculate the number of moles of each product:
n(CaF₂) = 4.12 mol (CaCO₃) × (3 mol CaF₂ / 3 mol CaCO₃) = 4.12 mol n(Al₂(CO₃)₃) = 4.12 mol (CaCO₃) × (1 mol Al₂(CO₃)₃ / 3 mol CaCO₃) = 1.37 mol
Finally, let's calculate the mass of each product:
m(CaF₂) = 4.12 mol × 78.07 g/mol = 322.1 g m(Al₂(CO₃)₃) = 1.37 mol × 258.99 g/mol = 354.5 g
So, 322.1 g of CaF₂ and 354.5 g of Al₂(CO₃)₃ can be produced.
Calculate the number of grams of 4.0 % (m/m) NaCl so Luton that contains 7.00 g of NaCl?
Answer:
0.00479099293329 g
Explanation:
A salt is best described as a compound that is formed from the reaction between
A salt is best described as a compound that is formed from the reaction between an acid and a base.
Answer:
Reaction between acid and base is called as neutralization and forms salt and water.
Example, Sodium hydroxide reacts with HCl gives salt NaCl and water as below
NaOH + HCl------.> NaCl + H2O
What is the Bronsted-Lowry definition of an acid?
Use the conservation of mass to explain why a rusty nail weighs more than the original nail.
HELP When 400 J of heat is added to 5.6 g of olive oil at 23*C, the temperature increases to 87*C. What is the specific heat of the olive oil? (Show all work including the equation you use to solve). (3 points).
Q=mc*temperature change
400=5.6/1000*c*(87-23)
c=1160.07J/kg/k
what effect does a decrease in temperature have on the overall rate of a chemical reaction??
A decreased in temperature decreases ( BLANK A). The reaction rate will ( BLANK B).
choices for Blank A:
A. the activation energy of the reaction.
B. the number of collisions between molecules.
C. the number of products in the mixture.
CHOICES FOR BLANK B:
A. decrease
B. increase
C. remain constant
Change in temperature affects the rate of reaction since it causes a change in the number of collisions per unit time. These collisions cause the breaking of bonds and formation of new ones giving out new products. An increase in temperature increases the rate of collisions hence increasing the rate of reaction while a decrease in temperature leads to a decrease in the rate of reaction due to the decreased number of collisions per unit time. thus the correct choice for blank A is: B. the number of collisions between molecules and for blank B: decrease.
Answer:
A decrease in temperature changes "the number of collisions between molecules. The reaction rate will decrease.
Blank A: "the number of collisions between molecules.
Blank B: decrease.
An increase in temperature causes a rise in the energy levels of the molecules involved in the reaction, so the rate of the reaction increases. Similarly, the rate of reaction will decrease with a decrease in temperature.
An SCl2 molecule has ______(polar or nonpolar) bonds and a _________(bent, linear, tetrahedral, trigonal planar, trigonal pyramidal) molecular shape. As a result, an SCl2 molecule is ______.(polar or nonpolar)
Answer:
Polar , bent , polar
An SCl2 molecule has polar bonds and a bent molecular shape. As a result, an SCl2 molecule is polar.
Explanation:
The S-Cl bond in SCl2 is polar because the difference in electronegativity between the two atoms is greater than 0.5. SCl2 has a ‘bent’ molecular geometry, this may be explained by the presence of lone pairs of electrons. Polarity of a molecule depends on the polarity of the bonds and the shape of the molecule. Therefore since the molecule of SCl2 has polar bonds and its structure is bent, then it is a polar molecule.The correct blanks for 1, 2 and 3 are polar bonds, bent molecular shape and polar respectively.
An [tex]SCl_2[/tex] molecule has 1. polar bonds and a 2. bent molecular shape. As a result, an SCl2 molecule is 3. polar. In [tex]SCl_2[/tex], the sulfur (S) and chlorine (Cl) atoms form double bonds. Because chlorine is more electronegative than sulfur, resulting in an unequal distribution of electron density, the S–Cl bonds in[tex]SCl_2[/tex] are polar. [tex]SCl_2[/tex] has a bent or V-shaped molecular shape. On sulfur, which has a lone pair of electrons and two bond pairs, the repulsion between these electron pairs leads the molecule to a bent shape.
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