Answer:
1.5 mol.
Explanation:
It is known that every 1.0 mole of compound or element contains Avogadro's number (6.022 x 10²³) of molecules or atoms.Using cross multiplication:
1.0 mole of H₂ contains → 6.022 x 10²³ molecules.
??? mole of H₂ contains → 9.03 x 10²³ molecules.
∴ The no. of moles of H₂ contains (9.03 x 10²³ molecules) = (1.0 mol)(9.03 x 10²³ atoms)/(6.022 x 10²³ atoms) = 1.5 mol.
To find the total number of moles of hydrogen gas in 9.03 × 10²³ molecules, you divide the number of molecules by Avogadro's number (6.022 × 10²³ molecules/mole), resulting in approximately 1.5 moles of hydrogen gas.
To calculate the total number of moles of hydrogen gas (H₂) from the given number of molecules, we use Avogadro's number, which is 6.022 × 10²³ molecules per mole. The number of moles (n) is given by the formula:
n = {Number of molecules} ÷ {Avogadro's number}
Substituting our values, we get:
n = (9.03× 10²³ molecules ÷ 6.022 × 10²³ molecules/mole) ≈ 1.5 moles
Therefore, there are approximately 1.5 moles of hydrogen gas contained in 9.03 × 10²³ molecules of hydrogen gas.
What characterizes a strong acid or base? complete ionization in water polar covalent bonding presence of a hydroxide or hydrogen ion ionic bonding?
1. Complete ionization in water.
2. Ionization constant.
3. A good hydrogen-ion acceptor.
4. Weak acid.
5. This base ionizes slightly in aqueous.
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The main characteristic of a strong acid or base is that it completely ionizes in water. Option A is correct.
This means that the acid or base will dissociate into its ions when it is dissolved in water. For example, hydrochloric acid (HCl) is a strong acid that completely ionizes in water to form hydrogen ions (H⁺) and chloride ions (Cl⁻).
HCl(aq) → H⁺(aq) + Cl⁻(aq)
The presence of a hydroxide or hydrogen ion is also a characteristic of strong acids and bases, but it is not the only characteristic. For example, ammonia (NH₃) is a base that does not have a hydroxide ion, but it does dissociate into ammonium ions (NH₄⁺) and hydroxide ions (OH⁻) when it is dissolved in water.
NH₃(aq) + H₂O(l) → NH₄⁺(aq) + OH⁻(aq)
Polar covalent bonding is not a characteristic of strong acids or bases. Polar covalent bonding is a type of bonding that occurs between two atoms that have different electronegativities. The more electronegative atom will have a partial negative charge, while the less electronegative atom will have a partial positive charge. Option A is correct.
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What is added to white sugar to create brown sugar?
Brown sugar is made by adding molasses to refined white sugar, which may have been processed using bone char. The addition of molasses gives the distinct color and flavor to brown sugar.
Brown sugar is created by adding molasses to refined white sugar. This addition not only gives brown sugar its distinct color, but also imparts a rich flavor and increases the moisture content compared to white sugar. In the production process of brown sugar, it is important to note that if the white sugar utilized has been refined using bone char as a decolorizing filter, then the same process would likely be used in the production of the brown sugar from that manufacturer.
Bone char is derived from animal bones, and even though it is widely used in the sugar industry to achieve the white color of sugar, some consumers may seek alternatives due to dietary preferences or ethical concerns.
Sugar comes in various forms including beet sugar, cane sugar, and specialty sugars like coconut sugar or maple sugar. As for icing or powdered sugar, often used in icings and baked goods, it consists of refined sugar mixed with cornstarch and might also involve the use of bone char in its production.
What makes organic compounds reactive?
The bonds
The carbons
The hydrogens
The functional groups
Answer:
The functional groups
Explanation:
An organic compound is a compound that contain carbon and another element such as hydrogen, oxygen, nitrogen, etc.Functional groups are the portions of an organic compound that is capable of characteristic reactions. Functional groups determine the chemical and physical properties of many organic compounds. A chemist wishes to decrease the vapor pressure of a large volume of water. Which amount of solute will decrease it the most? (Note: Assume each sample of solute completely dissolves in the water.)
A)0.10 mol Al2(SO4)3
B)0.10 mol sucrose
C)0.40 mol glucose
D)0.20 mol NaCl
Answer:c
Explanation:
Answer: A) 0.10 mol [tex]Al_2(SO_4)_3[/tex]
Explanation:
As the relative lowering of vapor pressure is directly proportional to the amount of dissolved solute.
The formula for relative lowering of vapor pressure will be,
[tex]\frac{p^o-p_s}{p^o}=i\times x_2[/tex]
where,
[tex]\frac{p^o-p_s}{p^o}[/tex]= relative lowering in vapor pressure
i = Van'T Hoff factor
[tex]x_2[/tex] = mole fraction of solute
1. For 0.10 mol [tex]Al_2(SO_{4})_3[/tex]
[tex]Al_2(SO_4)_3\rightarrow 2Al^{3+}+3SO_4^{2-}[/tex]
, i= 5 as it is a electrolyte and dissociate to give 5 ions. and concentration of ions will be [tex]2\times 0.1+3\times 0.1=0.5[/tex]
2. For 0.10 mol sucrose
, i= 1 as it is a non electrolyte and does not dissociate, concentration of ions will be [tex]1\times 0.1=0.1[/tex]
3. For 0.40 mol glucose
, i= 1 as it is a non electrolyte and does not dissociate, concentration of ions will be [tex]1\times 0.4=0.4[/tex]
4. For 0.2 [tex]NaCl[/tex]
[tex]NaCl\rightarrow Na^{+}+Cl^{-}[/tex]
, i= 2 as it is a electrolyte and dissociate to give 2 ions, concentration of ions will be [tex]1\times 0.2+1\times 0.2=0.4[/tex]
Thus as concentration of solute is highest for [tex]Al_2(SO_4)_3[/tex] , the vapor pressure will be lowest.
Why is liquid mercury a good electrical conductor in terms of atomic structure?
Mercury is a heavy, silvery-white liquid metal. Compared to other metals, it is a poor conductor of heat, but a fair conductor of electricity. ... Because this configuration strongly resists removal of an electron, mercury behaves similarly to noble gases, which form weak bonds and hence melt at low temperatures.
Answer:
Explanation:
On the periodic table, Mercury belongs to group 12 and period eight(8). It has the Atomic number of eighty(80).
PHYSICAL PROPERTIES OF MERCURY:
Mercury is a d-block element and it is a liquid at standard pressure and temperature. It is silvery and heavy. It has boiling point of 629.88 K, Heat of fusion of 2.29 kJ/mol,molar heat capacity of 27.98
J/mol/K.
STRUCTURE:
Mercury is closed pack. The packing of Mercury makes it to conduct electricity better than alkaline earth metals. Mercury has a Rhombohedral crystal structure.
CONCLUSION:
Mercury has a structure which is efficiently packed and this allow its electrons to move freely. The free electrons can easily move to the conduction band.
What is the mole ratio of c4h10 to co2 in the reaction 2C4H10+13O2->8CO2+10H2O??
Answer:
The mole ratio of C₄H₁₀ and CO₂ is 2 : 8, which simplifies to 1 : 4.Explanation:
The mole ratio is the relative proportion of the moles of products or reactants that participate in the reaction according to the chemical equation.
The chemical equation given is:
2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂OOnce you check that the equation is balanced, you can set the mole ratios for all the reactants and products. The coefficients used in front of each reactant and product, in the balanced chemical equation, tells the mole ratios.
In this case, they are: 2 mol C₄H₁₀ : 13 mol O₂ : 8 mol CO₂ : 10 mol H₂O
Since you are asked about the mole ratio of C₄H₁₀ and CO₂ it is:
2 mol C₄H₁₀ : 8 mol CO₂ , which dividing by 2, simplifies to 1 mol C₄H₁₀ : 4 mol CO₂, or 1 : 2.tert-Butyl alcohol is a solvent with a Kf of 9.10 ∘C/m and a freezing point of 25.5 ∘C. When 0.807 g of an unknown colorless nonelectrolyte liquid was dissolved in 11.6 g of tert-butyl alcohol, the solution froze at 15.3 ∘C.Which of the following is most likely the identity of this unknown liquid? View Available Hint(s) tert-Butyl alcohol is a solvent with a of 9.10 and a freezing point of 25.5 . When 0.807 of an unknown colorless nonelectrolyte liquid was dissolved in 11.6 of tert-butyl alcohol, the solution froze at 15.3 .Which of the following is most likely the identity of this unknown liquid? ethylene glycol (molar mass = 62.07 g/mol) 1-octanol (molar mass = 130.22 g/mol) glycerol (molar mass = 92.09 g/mol) 2-pentanone (molar mass = 86.13 g/mol) 1-butanol (molar mass = 74.12 g/mol)
Answer:
ethylene glycol (molar mass = 62.07 g/mol).
Explanation:
We can solve this problem using the relation:ΔTf = Kf.m,
ΔTf is the depression in the freezing point of tert-Butyl alcohol (ΔTf = freezing point of pure solvent - freezing point in presence of unknown liquid = 25.5°C - 15.3°C = 10.2°C).
Kf is the molal freezing point constant of tert-Butyl alcohol (Kf = 9.1 °C/m).
m is the molality of unknown liquid.
∵ ΔTf = Kf.m
∴ m = ΔTf/Kf = (10.2°C)/(9.1 °C/m) = 1.121 m.
We need to calculate the molar mass of the unknown liquid:Molality (m) is the no. of moles of solute in 1.0 kg of solvent.
∴ m = (mass/molar mass) of unknown liquid/(mass of tert-Butyl alcohol (kg))
m = 1.121 m, mass of unknown liquid = 0.807 g, mass of tert-Butyl alcohol = 11.6 g = 0.0116 kg.
∴ molar mass of unknown liquid = (mass of unknown liquid)/(m)(mass of tert-Butyl alcohol (kg)) = (0.807 g)/(1.121 m)(0.0116 kg) = 62.06 g/mol.
So, the unknown liquid is:
ethylene glycol (molar mass = 62.07 g/mol).
Identify the reaction type shown and describe the clues that were used to identify it. NH4NO3 ? N2O + 2H2O
Answer:
Decomposition because it's one substance that gets broken down into two separate substances
Explanation:
Answer:
A decomposition reaction.
Explanation:
NH4NO3 ====> N2O + 2H2O
This is an example of a decomposition reaction. We know this because one reactant decomposes into many products. There are several examples of this type of reaction where heat, usually, is used to break down a chemical substance to simpler chemical substances.
The measure of a compounds likeliness to gain or lose an electron is its
Answer:
Is its electrification
Explanation:
Electrification is defined as the ability to gain or lose different electrical charges, usually electrons, and occurs when a collision of subatomic particles occurs. There are three ways to electrify: by rubbing, by contact or by induction. It is necessary to take into account that in these three ways of electrification, the principles of charge conservation and the primary electrostatic rule are present.
Alkali metals react with water to produces what product?
Answer:
Alkali metals react with water to produce hydroxide and hydrogen gas.Explanation:
That is a chemical property of alkali metals: they are highly reactive and react vigorously with water to produce the correspondant hydroxide and hydrogen gas.
These are some of those reactions:
2Li (s) + 2H₂O (l) → 2LiOH (aq) + H₂(g) ↑2Na (s) + 2H₂O (l) → 2NaOH (aq) + H₂(g) ↑2K (s) + 2H₂O (l) → 2KOH (aq) + H₂(g) ↑The alkali metals are the elements of group 1 of the periodic table: Li, Na, K, Rb, Cs, and Fr. They have one valence electron which may lose easily to form an ion with charge +1.
Alkali metals react with water to produce hydrogen gas and a basic solution of the metal hydroxide (for instance, sodium hydroxide when lithium is in the reaction). This reaction signifies the easier oxidation of alkali metals compared to hydrogen.
Explanation:When alkali metals react with water, they form hydrogen gas and a basic solution of the metal hydroxide. This vigorous reaction reveals that alkali metals are easier to oxidize than is hydrogen. For instance, considering the reaction of lithium with water:
2Li(s) + 2H₂O(l) --> 2NaOH(aq) + H₂(g)
The solid state (s) lithium reacts with liquid water to generate hydrogen gas and the ionic compound sodium hydroxide. This sodium hydroxide, which is a solid in its pure form, promptly dissolves in water.
The same kind of reaction occurs with other alkali metals and also some alkaline earth metals, although beryllium and magnesium are exceptions.
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The human eye is able to detect as little as 2.35 × 10–18 j of green light of wavelength 510 nm. Calculate the minimum number of photons of green light that can be detected by the human eye. Physical constants can be found here.
The minimum number of photons of green light, with 2.35x10⁻¹⁸ J of energy and 510 nm of wavelength, that can be detected by the human eye is 6.04 photons.
The energy of a single photon is given by:
[tex] E_{1} = h\frac{c}{\lambda} [/tex]
Where:
h: is the Planck constant = 6.62x10⁻³⁴ J*s
λ: is the wavelength of the green light = 510 nm = 510x10⁻⁹ m
c: is the speed of light = 3.00x10⁸ m/s
So, the energy of one photon is:
[tex]E_{1} = h\frac{c}{\lambda} = 6.62 \cdot 10^{-34} Js\frac{3.00 \cdot 10^{8} m/s}{510 \cdot 10^{-9} m} = 3.89 \cdot 10^{-19} J[/tex]
Now, since the energy of the green light detected by the human eye is 2.35x10⁻¹⁸ J, the minimum number of photons (n) to produce that amount of energy is:
[tex] E_{n} = nE_{1} [/tex]
[tex] n = \frac{E_{n}}{E_{1}} = \frac{2.35 \cdot 10^{-18} J}{3.89 \cdot 10^{-19} J} = 6.04 [/tex]
Therefore, the minimum number of photons of green light is 6.04 photons.
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Which of the following compounds has the highest boiling point?1. F22. NaF3. HF4. ClF
Answer:
HF
Explanation:
Hf has hydrogen bonding which is the strongest intermolecular forces. The stronger the IM forces, the higher the boiling point.
Under which set of conditions will the ideal gas law give the best approximation for the properties of a real gas?
Answer : A real gas behave ideally at high temperature and low pressure condition.
Explanation :
The conditions for ideal gas are :
Ideal gas are those gas that has no intermolecular attractions.
Ideal gas are those gas that have negligible volume.
The ideal gas equation is,
[tex]PV=nRT[/tex]
The conditions for real gas are :
Real gas are those gas that have intermolecular attractions.
Real gas are those gas that have volume.
The real gas equation is,
[tex](P+\frac{an^2}{V^2})(V-nb)=nRT[/tex]
Thus, A real gas behave ideally at high temperature and low pressure condition.
Who developed the idea of electron shells also called orbital shells
Answer: Niels Bohr
Explanation:
Answer:Niels Bohr
Explanation:
How long would it take the same amount of gaseous i2 to effuse from the same container under identical conditions?
(46 sec) x √ ((253.80894 g I2/mol) / (44.0128 g N2O/mol)) = 110 sec
Final answer:
Using Graham's law, we find that hydrogen effuses twice as fast as helium. Since a helium-filled balloon takes 6 hours to deflate by 50%, a hydrogen-filled balloon will take 3 hours to deflate to the same percentage under identical conditions.
Explanation:
The question refers to the concept of effusion of gases, which is covered under the topic of kinetic molecular theory in chemistry. The rate of effusion of a gas can be described by Graham's law, which states that the rate of effusion of a gas is inversely proportional to the square root of its molar mass. Given that helium gas takes 6 hours to deflate to 50% of its original volume, and knowing that hydrogen gas effuses four times faster than oxygen, we can compare the properties of helium and hydrogen to determine how long it should take for a balloon with hydrogen gas to deflate to the same extent under identical conditions.
To find the time it will take for the hydrogen balloon to deflate, we need to use the relative rates of effusion of hydrogen and helium. Given that hydrogen has a molar mass of approximately 2 g/mol and helium has a molar mass of approximately 4 g/mol, we can calculate the relative rate of effusion using the formula from Graham's law:
Rate of effusion (helium) / Rate of effusion (hydrogen) = sqrt(Molar mass of hydrogen) / sqrt(Molar mass of helium)
Rate of effusion (helium) / Rate of effusion (hydrogen) = [tex]\sqrt{2}[/tex] / [tex]\sqrt{4}[/tex]
This means that the rate of effusion for helium is half that of hydrogen. Since effusion rate is inversely related to the time taken, if helium takes 6 hours to effuse 50%, hydrogen, which effuses twice as fast, will take half the time. Therefore, an identical balloon filled with hydrogen gas will take 3 hours to decrease its volume by 50%.
Some properties, like boiling point elevation and freezing point depression, change in solutions due to the presence and number of of solute particles dissolved in the solvent. These properties are called ___________ properties. A) chemical B) colligative C) qualitative D) quantitative
D. quantitative properties
Boiling point and freezing point depression are both values that can be represented quantitatively (in number form).
Answer:
the correct answer is b
Explanation:
i just got it right on usatestprep
25 POINT QUESTION! HELP ASAP! WILL GIVE BRAINLIEST TO CORRECT ANSWER!!
A) The pathway A-B-D involves a catalyst and is slower than A-C-D.
B) The pathway A-B-D involves a catalyst and is faster than A-C-D.
C) The pathway A-C-D involves a catalyst and is slower than A-B-D.
D) The pathway A-C-D involves a catalyst and is faster than A-B-D.
Answer:
D
Explanation:
A catalyst functions to speed up chemical reaction. It does this by lowering the activation energy required for the reaction to begin by providing an alternative pathway for the substrates to interact with each.
The pathway ABD involves a reaction that requires a higher activation energy as compared to reaction following the pathway ACD as seen in the diagram.
So it means that a catalyst must be mediating the reaction with the lower activation energy. -pathway ACD, and this reaction will proceed faster than the reaction following the pathway ABD.
Hence option D is the only valid and correct option.
Hope this helps! Fusion reactions constitute the fundamental energy source of stars, including the Sun. Hydrogen “burning” initiates the fusion energy source of stars and leads to the formation of helium. Generation of fusion energy for practical use also relies on fusion reactions between the lightest elements that burn to form helium. In fact, the heavy isotopes of hydrogen—deuterium and tritium—react more efficiently with each other, and, when they do undergo fusion, they yield more energy per reaction than do two hydrogen nuclei. The hydrogen nucleus consists of a single proton. The deuterium nucleus has one proton and one neutron, while tritium has one proton and two neutrons.
What conclusion can be drawn from this information?
A)
Deuterium and tritium are required to burn hydrogen.
B)
The most efficient fusion reactors would use two hydrogen nuclei.
C)
The most efficient fusion reactors would use heavier forms of hydrogen.
D)
Helium occurs naturally. The burning of hydrogen is not required to get helium in nature.
Answer:
C) The most efficient fusion reactors would use heavier forms of hydrogen.
Explanation:
From the information presented to us in the question, the third sentence reveals that heavier forms of hydrogen produces larger amount of energy and most importantly reacts more efficiently when fusion occurs.
In fact, the heavy isotopes of hydrogen—deuterium and tritium—react more efficiently with each other, and, when they do undergo fusion, they yield more energy per reaction than do two hydrogen nuclei.
What happens when you mix an acid and a base together
It will generate water and kind of salt ,such as:
HCl+NaOH==>NaCl+H2O
Lightsticks produce light via a chemical reaction. Dropping a lightstick into hot water makes it glow A) less intensely. B) more intensely. C) a different color. D) for a longer period of time.
Answer:
B.) More intensely
Explanation:
If you immerse a lightstick in hot water, the chemical reaction will speed up. The stick will glow much more brightly but will wear out faster too.
Answer: Option ' B ' is correct.
Explanation:
When we drop a light stick into hot water , it glow more intensely.
Because in warm water, chemical reaction may occur faster as compare to in cold water.
Chemical reaction in hot water is faster due to which light stick glow much brighter.
To make the light stick last longer, chemical reaction needed to be slower for that it must be kept in freezer or in colder place.
Hence, Option 'B' is correct.
When 7.50 l of sulfur trioxide are produced by the reaction of sulfur dioxide in an excess of oxygen at standard temperature and pressure, how many liters of sulfur dioxide were used? 2so2 (g) + o2 (g) yields 2so3 (g)?
Answer:
[tex]\boxed{\text{7.50 L SO}_{2}}[/tex]
Explanation:
For this problem, we must use Gay-Lussac's Law of Combining Volumes:
The ratio in which gases react is the same as the ratio of their coefficients in the balanced equation.
The balanced equation is
Theor: 2 L 2 L
2SO₂ + O₂ ⟶2 SO₃
V/L: 7.50
Gay-Lussac's Law tells us that 2 L of SO₂ form 2 L of SO₃.
The volume of SO₂ used was
[tex]V = \text{7.50 L SO}_{3} \times \dfrac{\text{2 L SO}_{2}}{\text{2 L SO}_{3}}\\\\V = \boxed{\textbf{7.50 L SO}_{2}}[/tex]
Answer:
7.50
Explanation:
Each substance on the left side of the arrow in a chemical equation is a ____.
Answer:
Each substance on the left side of the arrow in a chemical equation is a reactant.
Explanation:
The chemical changes (chemical reactions) are represented by chemical equations.
The chemical equations show the starting substances and the final substances.
The starting substances of the reaction are the reactants.
A single arrow is used to indicate the direction of the reaction, the reactants are placed on the left side of the equation, and the products appear on the right side.
This sketch shows that:
reactants yield products
general form A + B → C + D
example Na + Cl → NaCl
There are several ways to express solution concentration: dilute, concentrated, ppm, molarity, molality, normality. All of these have one thing in common. They describe the A) weight of solute mixed with a specific volume of water. B) quantity of solute dissolved in a given quantity of solvent. C) quantity of solvent dissolved in a given quantity of solute. D) amount in grams of solute dissolved in the volume of solvent.
Answer:
just pick b
Explanation:
HELP ASAP PLEASE!!!
I’m organic compounds all carbon atoms must be bonded only to other carbon atoms.
A. True
B. False
How can you determine through observation that a mixture is a suspension
Answer:
You can determine through observation that a mixture is a suspension from the fact that particles separate and a solid substance is formed at the bottom of the mixture.Explanation:
Suspensions are heterogenous mixtures where particles settle when times passes.
The partilces in suspensions are not dissolved (solvated by a solvent). The mixtures where the particles are dissolved are solutions. Then, solutions and supensions are different in that the former have the particles solvated and the latter not.
The particles in a solution are molecules or ions. Such solvated particles in a solution are very small; in comparison,the particles on a suspension are larger. Then, the weight of the particles in a suspension makes that they separate from the liquid and settle down.
Final answer:
A mixture is a suspension if it has a cloudy appearance and the particles settle out over time, a process known as sedimentation. Unlike solutions, suspensions are heterogeneous and the suspended particles are often visible and can be filtered out.
Explanation:
To determine if a mixture is a suspension, you could look for a few key characteristics. Suspensions are heterogeneous mixtures which means they are composed of different substances that remain separate upon standing. One clear indication that a mixture is a suspension is that you will notice the suspended particles settling out of the mixture over time. This process is known as sedimentation. Suspensions also appear cloudy due to the presence of large particles that are often visible to the eye or can be seen with a magnifying glass.
By contrast, a solution is a homogeneous mixture where the dissolved species do not settle out but remain evenly distributed. A common example of a suspension that can be observed in everyday life is muddy water. When left undisturbed, the mud particles, which are suspended in the water, will settle to the bottom, leaving clearer water above the sediment. Similarly, in mixtures like flour and water, after mixing and then allowing it to stand, the flour will gradually settle to the bottom of the container.
It's important to note that mixtures like milk of magnesia are also suspensions. Instructions often require shaking of the container before use to ensure that the settled particles are evenly redistributed throughout the liquid.
To sum up, the consequential settling of particles and the cloudy appearance are definitive indicators that a mixture is a suspension and not a solution or colloid.
The reaction below can be catalyzed by manganese dioxide (MnO2). If you carried out such a reaction, which compound would you expect to find in the reaction container at the end of the reaction?
2H2O2 ?2H2O + O2
A. MnO
B. MnH2
C. MnO2
D. MnOH
Answer:
[tex]\boxed{\text{C. MnO$_{2}$}}[/tex]
Explanation:
2H₂O₂ ⟶ 2H₂O + O₂
A catalyst is a substance that speeds up a reaction but can be recovered unchanged at the end.
Thus, at the end of the reaction I would expect to find H₂O and MnO₂ in the container.
Water is not listed in any of the options, so I will have to choose [tex]\boxed{\text{C. MnO$_{2}$}}[/tex].
A, B, and D are wrong. They are not reactants, products, or catalysts.
A neutral atom always contains the same number of
Answer:
A neutral atom always contains the same number of protons and electrons.Explanation:
Neutral means that the net charge is zero.
Atoms have protons, neutrons and electrons.
Neutrons and protons are in the nucleus of the atom. Protons are particles with positive charge and neutrons are particles without charge.
Elctrons, which are surrounding the nucleus, are particles with negative charge.
The relativie charges of protons and electrons are +1 and -1, respectively.
So, in order to have a total net charge of zero, the neutral atom must have the same number of protons as electrons.
If a sample has a mass of 1.25⋅102 g and a volume of 51 mL, what is its density?
Answer:
2.5 g/mlExplanation:
1) Data:
a) m = 1.25 × 10² g
b) V = 51 ml
d) density = ?
2) Principles and formulae:
Density is a concentration unit that tells the ratio of the mass of a substance to its volume.
Equation: d = m / VWhere d is the density of the substance, m is the mass, and V is the volume.
3) Solution:
a) Substitute the data into the equation:
d = m / V = 1.25 × 10² g / 51 ml = 2.45 g/ml.b) Use the correct number of significant digits: 2.45 g/ml must be rounded to two signficant figures, i.e. to 2.5 g/ml, since the volume was given with two significant digits.
Approximately how many atoms of carbon are present in a 120 gram sample of carbon?
A 120-gram sample of carbon contains approximately 6.02 x 10^24 atoms. We calculate this based on the fact that a mole of carbon weighs 12 grams and contains 6.02 x 10^23 atoms.
Explanation:The subject you're studying is related to atoms, more specifically, counting the number of carbon atoms in a given mass. To solve this, we need to understand the concept of a mole. A mole is an amount of substance that contains the same number of entities (atoms in this case) as there are in exactly 12 grams of ¹2C, or carbon-12. Hence, one mole of carbon is equivalent to 12 grams of carbon, and this mole contains 6.02 x 10^23 atoms (this number is called Avogadro's Number).
Given that your sample is 120 grams of carbon, this translates to 10 moles of carbon since 120 grams divided by 12 grams/mole equals 10 moles. So, the number of carbon atoms present in your 120 grams sample would be 10 moles multiplied by Avogadro's number, equating to approximately 6.02 x 10^24 carbon atoms.
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Are Noble gases considered inert gases
yes because they are inert or inactive at normal temperature, they are inactive because their outer most orbit contain either 2 or 8 electrons.that make them stable
Answer:
They are called inert gases because they were thought to be completely inert—unable to form compounds.
Explanation: