Chemistry EOC Review

The three types of nuclear radiation in order of increasing penetrating power are

• alpha, beta, gamma

• alpha, gamma, beta

• beta, alpha, gamma

• gamma, alpha, beta

The rate at which a radioactive element decays is its ____.

• quarter life

• whole life

• wonderful life 

• half life

Tags

NGSS.HS-PS1-8

Barium-122 has a half-life of 2 minutes. A fresh sample weighing 80 g was obtained. If it takes 4 minutes to set up an experiment using barium-122, how much barium-122 will be left when the experiment begins?

• 40g

• 2.5g

• 20g

• 80g

If 10 mg of iodine 131 is given to a patient, how much is left after 24 days? The half-life of iodine-131 is 8 days.

• 25mg

• 25g

• 10g

• 10mg

Lithium is a metal with an oxidation number of 1⁺ and oxygen is a nonmetal with an oxidation number of 2^-. Which chemical formula represents the compound formed by these two elements?

• Li2O

• Li₃O

• LiO

• LiO2

Tags

NGSS.HS-PS1-2

The compound formed has a(n) ___________ bond and is a(n) _________________.

• ionic; crystalline solid

• covalent; amorphous solid

• metallic; crystalline solid

• covalent; crystalline solid

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The decomposition of dinitrogen tetraoxide into nitrogen gas and oxygen gas is shown by which balanced chemical equation?

• N2(g) + 2O2(g) → N2O4(g)

• N2O4(g) → N2(g) + O2(g)

• N2O4(g) → N2(g) + 2O2(g)

• N2O4(g) + 2O2(g) → N2(g)

Tags

NGSS.HS-PS1-7

Two isotopes of hydrogen fuse to form a neutron plus the larger element,

• beryllium

• carbon

• deuterium

• helium

Tags

NGSS.HS-PS1-8

The oxidation number of all metals on the periodic table have a positive (+) charge. Which of these BEST explains why?

• Metals are known to add protons to their nuclei causing them to become positively charged.

• All metals lose one or more valence electrons to become stable, giving them a positive oxidation number.

• All metals gain one or more valence electrons to become stable, giving them a positive oxidation number.

• Metals are known to lose protons and add neutrons to their nuclei causing them to become positively charged.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

A ping pong ball with a dent in it can be put into a pan of boiling water. After a short amount of time, the dent will pop out. Determine the best reason for this occurrence.

• The ping pong ball plastic heats up and expands.

• The number of gas particles inside the ping pong ball increases causing more pressure.

• The gas particles inside speed up due to heat and cause an increase in pressure within the ball.

• Gas particles inside collide with each other less and with the ball more causing the dent to pop out.

Tags

NGSS.MS-PS1-4