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2 years ago

It is easier to push a sofa across a rough surface like carpet than a smooth surface like a hardwood floor.

Chemistry

1 answer:

Gelneren [198K]2 years ago

3 0

False, pushing a sofa on a hardwood floor would be easier than on carpet.

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What are two things that happened as a blood passes the lungs?

amm1812

Answer:

blood travels to the pulmonary arteries

Explanation:

This is called the pulmonary circulation. From your pulmonic valve, blood travels to the pulmonary arteries and eventually to tiny capillary vessels in the lungs.

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2 years ago

Please help Sodium (Na) has an atomic number of 11 and an atomic mass of 23. Which of the following correctly shows the electron

fredd [130]

2,8,1
It's in group 1, so its outershell only has 1 electron, and the other shells are completely filled, so 2 then 8. :)

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3 years ago

Sonar stands for “sound navigation and ranging.” What assumption was proved wrong after the invention of sonar?

Vesna [10]

Answer:

B. The ocean floor is featureless.

Explanation:

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2 years ago

A copper wire is made of copper (Cu) atoms. Which of the following best describes the copper atoms?

Evgesh-ka [11]

Answer: Option (A) is the correct answer.

Explanation:

An element is defined as a substance that contains atoms of same type.

As copper wire is a substance that is made up of only atoms of copper. And, all these atoms of copper will be the same. Hence, it is an element.

This means that all the atoms of copper will have same number of protons, neutrons and electrons.

Thus, we can conclude that the statement they are all exactly the same best describes the copper atoms.

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2 years ago

Read 2 more answers

oth hydrogen sulfide (H2S) and ammonia (NH3) have strong, unpleasant odors. Which gas has the higher effusion rate? If you opene

Ksju [112]

Answer: Odor of ammonia would we detect first on the other side of the room.

Explanation:

To calculate the rate of diffusion of gas, we use Graham's Law.

This law states that the rate of effusion or diffusion of gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows:

$\text{Rate of diffusion}\propto \frac{1}{\sqrt{\text{Molar mass of the gas}}}$

$\frac{Rate_{H_2S}}{Rate_{NH_3}}=\sqrt{\frac{M_{NH_3}}{M_{H_2S}}}$

$\frac{Rate_{H_2S}}{Rate_{NH_3}}=\sqrt{\frac{17.031}{34.1}}$

$\frac{Rate_{H_2S}}{Rate_{NH_3}}=0.71$

Thus the odor of ammonia would we detect first on the other side of the room as the rate of effusion of ammonia would be faster as it has low molecular weight as compared to hydrogen sulphide.

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3 years ago

Read 2 more answers