An aluminum sample has a mass of 80.1 g and a density of 2.70g/cm3 . According to the date to what number of significant figures should the calculate volume of the aluminum sample be expressed?

Answers

Answer 1

Answer: 80.1 g* (1 cm^(3)/ 2.70 g)= 29.666666... cm^(3).

The calculated volume should have 3 significant figures, so the final answer is 2.97*10^(1) cm^(3)

Hope this helps~

Answer 2

Answer: 3 Sig figs because both measurements have three sig figs. In a lab setting, you would round to your least precise measurement. So its useless to use a meter stick and a high precision scale to take measurement because you have to use the amount of Sig figs for your least precise tool

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The capacity of a muscle to continue contracting over a period of time without fatigue is called: A. muscular strength.
B. muscular endurance.
C. cardiovascular endurance.
D. power.

Answers

B. muscular endurance

The capacity of a muscle to continue contracting over a period of time without fatigue is called muscular endurance.
NOT:
A. muscular strength.
C. cardiovascular endurance.
D. power.

Which quantities must be conserved in all chemical reactions? 1) mass, charge, density
2)mass, charge, energy
3) charge, volume, density
4) charge, volume, energy

Answers

2) mass, charge, energy

in a balanced reaction, all of the following are conserved

Answer: It's B this will help u

How does the number of protons compare to the number ofelectrons in an anion?
a There are more electrons than protons.
b There are more protons than electrons.
c
There is no consistent relationship between the
numbers of protons and electrons.
d There are equal numbers of protons and electrons.

Answers

It is A).
Electrons are negatively charged and an anion is a negatively charged ion so that means there is more electrons(negative charge) than protons(positive charge) in an anion

Answer:B is the right answer

Explanation:

Which of the following affects the rate of a chemical reaction?A. the presence of a catalyst
B. the temperature
C. the concentration of reactants
D. all of the above

Answers

The following that affects the rate of a chemical reaction is the presence of catalyst, temperature, and concentration of reactant. The correct option is D.

What is the rate of a reaction?

The rate of reaction is the speed of the reaction at which a reaction takes place.

The catalyst increases the rate of reaction.

The increase in temperature increases the rate of reaction.

Thus, the correct option is D. all of the above.

Learn more about the rate of a reaction

brainly.com/question/8592296

D. A ll of the above. catalyst reduces the activation energy thereby making the reaction faster. an increase in temperature increases the kinetic energy and no of collisions making reaction faster for an endothermic reaction while decrease in temperature favors an exothermic reaction.
increase in concentration increases the molecules reacting so the reaction is faster and vice versa.

Why do we crack molecules?

Answers

We need to crack molecules in order for us to get the desired molecule. For example, in the extraction of crude oil, after entering the fractional distillation, it will give products base on their molecular structure. The products are gasoline, diesel fuel, jet fuel, wax, asbestos,kerosene.

cracking is the process whereby complex organic molecules such as kerogens or long chain hydrocarbons are broken down into simpler molecules such as light hydrocarbons,.
it is done to get more important substances

What volume of hydrogen is necessary to react with five liters of nitrogen to produce ammonia? N2 + 3H2 --> 2NH3

Answers

Volume of hydrogen required to produce ammonia = 3*5 = 15L
since, 1 mole of nitrogen reacts with 3 moles of hydrogen to produce ammonia.
Amount of ammonia produced = 2*5 = 10L as 1 mole of nitrogen produces 2 moles of ammonia

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