Q: If an atom has a mass of $$3.32 \times 10$$^{-23}$$ g, what is its mass in kilograms?

$$3.32 \times 10$$^{-23}$$ \ kg

Q: Which of the following is the correct conversion factor for 1 AMU to kilograms?

$$1.66 \times 10$$^{-27}$$ \ kg$

Q: A sample contains $$2.1028 \times 10$$^{21}$$ electrons. What is the total mass of these electrons in kilograms?

$$1.92 \times 10$$^{-10}$$ \ kg

Question 1

Which subatomic particle has a relative mass closest to 1 and a relative charge of +1?

Accepted Answer

Proton

Question 2

Given that 1 atomic mass unit (AMU) is $$1.66 	imes 10$$^{-27}$$ kg, what is the mass in AMU of a neutron with an actual mass of 1.67493$$ 	imes $$10^{-27} kg$$?

Accepted Answer

$$1.01$$ AMU

Question 3

If an atom has 11 protons, 12 neutrons, and 10 electrons, what is its net charge?

Accepted Answer

$$+1$$

Question 4

Which of the following best describes the role of the atomic mass unit (AMU) in chemistry?

Accepted Answer

It is used to compare the relative masses of atoms and subatomic particles.

Question 5

A sample contains $$1.0465 	imes 10$$^{25}$$ kg of electrons. Using the electron's actual mass of 9.109$$ 	imes $$10^{-31} kg$$, how many electrons are present?

Accepted Answer

$$1.15 	imes 10$$^{55}$$

Question 6

Osmium has an actual mass of 190.23 grams. What is its mass in atomic mass units (AMU)?

Accepted Answer

$$1.15 	imes 10$$^{26}$$ \ Da

Question 7

Which subatomic particle is responsible for the chemical identity of an element?

Accepted Answer

Proton

Question 8

If the mass of a sodium atom is $$3.82 	imes 10$$^{-23}$$ g, how many sodium atoms are in a 0.239$ g sample?

Accepted Answer

$$7.19 	imes 10$$^{21}$$

Question 9

Which of the following statements about electrons is correct?

Accepted Answer

Electrons have a relative charge of -1.

Question 10

A neutral atom contains 20 protons, 20 neutrons, and 20 electrons. What is its mass in AMU?

Accepted Answer

$$40.0005$$ AMU

Question 11

Which subatomic particle has the smallest actual mass?

Accepted Answer

Electron

Question 12

If an atom has a mass of $$3.32 	imes 10$$^{-23}$$ g, what is its mass in kilograms?

Accepted Answer

$$3.32 	imes 10$$^{-23}$$ \ kg

Question 13

Which of the following is the correct conversion factor for 1 AMU to kilograms?

Accepted Answer

$$1.66 	imes 10$$^{-27}$$ \ kg$

Question 14

A sample contains $$2.1028 	imes 10$$^{21}$$ electrons. What is the total mass of these electrons in kilograms?

Accepted Answer

$$1.92 	imes 10$$^{-10}$$ \ kg

Question 15

Which subatomic particle has no electrical charge?

Accepted Answer

Neutron

Question 16

If a carbon atom has 6 protons, 6 neutrons, and 6 electrons, what is its atomic mass in AMU?

Accepted Answer

$$12.0005$$ AMU

Question 17

Which of the following best explains why the mass of an atom is not exactly equal to the sum of the masses of its subatomic particles?

Accepted Answer

Because of mass lost as binding energy when the nucleus forms.

Question 18

A sample of sodium contains $$7.19 	imes 10$$^{21}$$ atoms. If each atom has a mass of 3.82$$ 	imes $$10^{-23} g$$, what is the total mass of the sample?

Accepted Answer

$$0.239 g$$

Question 19

Which of the following is NOT a property shared by all three subatomic particles?

Accepted Answer

They all have charge.

Subatomic Particles and Atomic Mass Units in GOB Chemistry

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