STAAR Review 2019-2021-2022 8th Grade Science

Based on these properties, which element is most likely a nonmetal?

• Element 1

• Element 2

• Element 3

• Element 4

Tags

NGSS.MS-PS1-2

Which statements correctly compare metals and nonmetals?

• F

• G

• H

• J

Tags

NGSS.MS-PS3-4

A student is trying to classify an unidentified, solid gray material as a metal or a nonmetal. Which question will best help the student classify the material?

• F

• G

• H

• J

Which statements best describe the charges on the particles in this model?

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Tags

NGSS.MS-PS1-1

If a fluorine atom has a mass number of 19, how many neutrons are in the atom?

Mathematical Equivalence

ON

Answer explanation

The mass is the total number of protons & neutrons. The atomic number is the number of protons only.

M.A.N.

atomic Mass - Atomic # = # of neutrons.

Tags

NGSS.MS-PS1-1

How many neutrons are in the nucleus of a potassium atom with a mass number of 39?

Mathematical Equivalence

ON

Tags

NGSS.MS-PS1-1

Click on the visual for the question.

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Tags

NGSS.MS-PS1-1

Sodium and Lithium have similar chemical properties. What characteristics of these elements explains why they are chemically similar?

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Tags

NGSS.MS-PS1-1

Atoms of which two elements are represented by these two models?

• Oxygen, O, and Neon, Ne

• Fluorine, F, and Neon, Ne

• Silicon, Si, and Phosphorous, P

• Beryllium, Be, and Boron, B

Tags

NGSS.MS-PS1-1

Which pair of elements has reactivity that is similar to Chlorine, Cl ?

• Fluorine, F

• Sulfur, S

• Iodine, I

• Argon, Ar