A crucible contains 6.4 g of copper, Cu. How many moles does this amount contain? [Given: Cu=64]

Answers

Answer 1

Answer: Use this formula:
Mass = moles x RFM

(RFM = Relative Formula Mass, or the total mass of a substance or element for example Cu=64)

Rearrange the formula to find the number of moles
Moles = mass/RFM
=6.4/64
= 0.1

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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.

If the momentum of a car is reduced by half, assuming mass did not change, what must also have been reduced by half?

Answers

Answer:

Velocity is halved

Explanation:

Momentum is contingent on mass and velocity. The quantity of motion in a body is called the momentum of the body.

Momentum = mass x velocity

Now, if mass does not change and momentum is reduced by half, it suggests that the velocity was reduced by half.

Velocity is directly related to momentum.

What is sublimation?

Answers

Sublimation is the transition from solid to gaseous.

hope this helps!

Solidsto gases without entering liquid state

Which of the following is not an example of a mineral crystal shape?a. Kryptonite
b. Pyrite
c. Quartz
d. Calcite

Answers

Kryptonite is not an example of a mineral crystal shape.

Answer: a. Kryptonite

I dont understand this.. In a bond between an atom of carbon and an atom of fluorine, the fluorine atom has a?A. weaker attraction for electrons
B. stronger attraction for electrons
C. smaller number of first-shell electrons
D. larger number of first-shell electrons

Answers

The correct answer is B.

Look into period table of elements at electronegativity.
Electronegativity of carbon is 2.5 and of fluorine 4.0.
Electronegativity is a strenght/ability to attract electrons.

Fluorine eletronegativity is much higher so it's atom has stronger attraction of electrons.

Which phrase describes an activated complex?

Answers

high energy and unstable

How is it? The activated complex is the structure at the maximum energy point along the reaction path; the activation energy is the difference between the energies of the activated complex and the reactants.

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Paintball is a popular recreational activity that uses a metal tank of compressed carbon dioxide or nitrogen to launch small capsules of paint. A typical tank has a volume of 508 cubic centimeters. A 340. gram sample of carbon dioxide is added to the tank before it is used for paintball. At 20.oC, this tank contains both CO2(g) and CO2(l). After a paintball game, the tank contains only CO2(g).Determine the total number of moles of CO2 added to the tank before it is used for paintball.

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What is true when two reactants combine in an exothermic reaction?