Chemistry Review 2024

The relative abundance of the three most common isotopes of titanium are shown in the image. Based on this data, what is the average atomic mass, in amu, of titanium?

• A. 46.95

• B. 47.46

• C. 47.68

• D. 47.87

What is the correct name for the compound whose formula is Fe₂O₃?

• iron oxide

• iron trioxide

• iron(II) oxide

• iron(III) oxide

The table lists some properties of a sample of lauric acid.

Which of these is an intensive property of this sample?

• Volume

• Mass

• Boiling point

• Number of moles

How can a physical property be investigated?

• Melting ice.

• Letting milk turn sour.

• Allowing silver to tarnish.

• Burning wood.

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NGSS.MS-PS1-2

NGSS.MS-PS1-4

How many electrons does a neutral atom of silicon contain?

• 14 electrons.

• 28.09 electrons.

• 16 electrons.

• 38 electrons.

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NGSS.HS-PS1-1

What is the correct name for the compound whose formula is Na₂SO₄?

• disodium sulfate

• sodium sulfoxide

• sodium sulfate

• sodium sulfite

Differentiate between fission and fusion.

• It is when cells are changing and exchanging DNA material via the pila

• Fusion is when a heavy nuclei splits into two or more lighter nuclei. Fission is when two lighter nuclei join to form a heavier nuclei.

• Fission is when a heavy nuclei splits into two or more lighter nuclei. Fusion is when two lighter nuclei join to form a heavier nuclei.

• Fission and fusion is when a heavy nuclei splits into two or more lighter nuclei.

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NGSS.HS-PS1-8

To two significant figures, the measurement 0.0256 g should be reported as:

• 0.02 g.

• 0.025 g.

• 0.026 g.

• 2.5 x 10^2 g.

In the experiment conducted by Ernest Rutherford, which of the following is a conclusion that resulted from scattering alpha particles by a thin gold foil?

• The nucleus is negatively charged.

• The atom is a dense solid and is indivisible.

• The nucleus is very small and the atom is mostly empty space.

• The mass is conserved when atoms react chemically.

A 5.0 g sample of aluminum with a speci􀀁c heat of 0.90 J/(g ⋅ °C) was heated from 22.1°C

to 32.1°C. How much heat, to the nearest joule, did the aluminum gain?

• 45

• 35

• 20

• 14

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NGSS.HS-PS3-1

NGSS.HS-PS3-4