Which is a better predictor of an elements properties, the elements group or the elements atomic mass? Give a reason.

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Answer 1

Answer:

Answer:

Explanation: elements of a group have similar chemical properties but in a period they have different atomic mass . This is because the atomic mass is uniqe to each element

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Which of the following statements is true of the critical temperature of a pure substance?A. The critical temperature is the temperature above which the liquid phase of a pure substance can exist. B. The critical temperature is the temperature above which the liquid phase of a pure substance cannot exist. C. The critical temperature is the temperature below which the liquid phase of a pure substance cannot exist. D. The critical temperature is the temperature at which all three phases can coexist. E. The critical temperature is the temperature at which the pure substance reaches, but cannot go beyond, the critical pressure. Can someone explain this one?

Plz help me i need to know how to do this!!!

Answers

Equivalent conversions:

1 atm = 760 mm Hg = 101.325 kPa

Dalton’s law is presented inthis formula, P = p1 + p2 + … +pn where p1, p2 to pn are the pressures of theindividual gases and the P is the total pressure.

Let p1 = CO2, p2 = O2 and p3 =N2

p1 = 125mmHg (1 atm/760 mmHg) =0.1645 atm

p2 = 22 kPa (1 atm/101.325 mmHg)= 0.2171 atm

P = p1 + p2 + p3

1.5atm = 0.1645 atm + 0.2171 atm+ p3

p3 = N2 = 1.1184 atm

Cigarettes contain many chemicals. Which of the following chemicals is the addictive component to cigarettes?a. tar
b. nicotine
c. carbon dioxide
d. carbon monoxide

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B is the correct answer, thankyou.

The metric unit of force is the

A. newton
B. pound
C. kilogram
D. watt

Answers

Answer:

Newton

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One way to remove nitrogen oxide from smokestack emissions is to react it with ammonia: 4 NH3 (g) + 6 NO (g) ----------> 5 N2 (g) + 6H2O (I)Fill in the blanks below:

12.3 mol of NO reacts with ______ mol of ammonia
5.87 mol of NO yields _______ mol nitrogen

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Final answer:

12.3 moles of nitrogen oxide (NO) react with 8.2 moles of ammonia (NH3) in the given reaction. The reaction of 5.87 moles of NO yields 4.89 moles of nitrogen (N2).

Explanation:

The overall reaction equation represents an ideal stoichiometric ratio where 4 moles of ammonia (NH3) react with 6 moles of nitrogen oxide (NO) to produce 5 moles of nitrogen (N2) and 6 moles of water (H2O). Let's work with this ratio to fill in the blanks of your question.

Given that 6 moles of NO react with 4 moles of NH3, we can set up a ratio to find the unknown quantity of NH3 that reacts with 12.3 moles of NO: (4 NH3 / 6 NO) x 12.3 NO = 8.2 moles of NH3

Similarly, 5 moles of nitrogen are produced per 6 moles of NO reacted, so we can find out how much nitrogen is produced from 5.87 moles of NO: (5 N2 / 6 NO) x 5.87 NO = 4.89 moles of nitrogen.

Learn more about Stoichiometry here:

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Final answer:

12.3 moles of NO reacts with 8.2 moles of Ammonia. 5.87 moles of NO yields 4.89 moles of Nitrogen.

Explanation:

In these types of problems, we use the concept of mole ratios from the balanced chemical equation. According to the reaction, 4 moles of NH3 react with 6 moles of NO to yield 5 moles of N2. Therefore, for 12.3 moles of NO, we apply the ratio 4/6 to determine that it reacts with 8.2 moles of NH3.

Similarly, 5.87 moles of NO, based on the ratio 5/6, yields 4.89 moles of N2. So, these are the missing quantities for the reaction.

Learn more about Mole Ratios here:

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The reactants in a chemical reaction contain 900 J of chemical energy. The products of the reaction contain 9000 J of chemical energy. Which statement best describes this chemical reaction? The reaction absorbs 9000 J of energy from the surroundings as it proceeds. The reaction releases 9000 J of energy to the surroundings as it proceeds. The reaction absorbs 8100 J of energy from the surroundings as it proceeds. The reaction releases 8100 J of energy to the surroundings as it proceeds. The answer is C

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For the reaction to take place the energy of the reactants must reach to the energy level of the products:
we have 900 J in the reactants and 9000 J for the products so the reactants need 8100 J to reach to the value of energy of products (900 + 8100 = 9000)
So the correct answer is C. The reaction absorbs 8100 J of energy from the surroundings as it proceeds.

The reaction absorbs 8100 J of energy from the surroundings as it proceeds.

In the chemical reaction in which sucrose is heated and decomposes to form carbon dioxide and water, which of the following is a reactant?a. sucrose
c. water
b. carbon dioxide
d. heat

Answers

A reaction in which the reactants splits to produce two or more products is called a decomposition reaction.

It can be represented as:

XY ------> X + Y

The correct answer is:

Option A. Sucrose

This can be explained as:

The reaction for the decomposition of sucrose is given as:

C₁₂H₂₂O₁₁ (Sucrose) + 12 O₂ -----> 12 CO₂ (Carbon dioxide) + 11 H₂O (water)

The reactant of a reaction is written generally on the left side of the reaction.

The reactant is a substance that reacts and undergoes chemical changes to form products.

Therefore, sucrose is the reactant.

To learn more about decomposition reaction, reactants and products follow the link:

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in the chemical reaction in which sucrose is heated and decomposes to form carbon dioxide and water a. sucrose is a reactant

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