TC Chem Unit 3 Chemical Reactions & Equations

Which of the following observations could be an indication of a chemical reaction of antimony?

• It is a solid at room temperature.

• It melts at 631°C.

• It expands upon freezing.

• It burns in an atmosphere of chlorine.

Tags

NGSS.HS-PS1-2

The _________ symbol separates the reactants from the products and means "to yield".

• +

• (s)

• →

• (g)

A balanced chemical equation is a direct presentation of the ___________.

• law of conservation of momentum

• law of conservation of energy

• law of conservation of mass

• ideal gas law

Tags

NGSS.HS-PS1-7

Which of the following is the correct word equation for the chemical reaction shown below?

• Aqueous aluminum and bromine gas react to produce solid aluminum bromide.

• Solid aluminum and aqueous bromine react to produce solid aluminum bromide.

• Solid aluminum and bromine gas react to produce solid aluminum bromide.

• Aqueous aluminum and bromine gas react to produce aqueous aluminum bromide.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Balance the chemical equation shown below. What is the coefficient in front of O_2(g)?

Fe_(s) + O_2(g) → Fe₍₂₎O_3(s)

• 2

• 3

• 4

• 5

Tags

NGSS.HS-PS1-7

Which is the correct atom count for the reactant side of the chemical equation?

CH₄ + 2 O₂ → CO₂ + 2 H₂O

• C=4

  H=4

  O=4

• C=1

  H=4

  O=2

• C=1

  H=4

  O=2

• C=1

  H=4

  O=4

Tags

NGSS.HS-PS1-7

Which is NOT an indicator of a chemical change?

• temperature change
• formation of a precipitate
• shape change
• production of light

Tags

NGSS.MS-PS1-2

Which problem is balanced?

• PbO₂ + 2H₂ → H₂SO₄

• SO₂ + H₂0 → H₂SO₄

• 2Na + 2H₂O → 2NaOH + H₂

• 2Na + 2H₂O → 2NaOH + H

Tags

NGSS.HS-PS1-7

How many hydrogen atoms are in: 3(NH₄)₂CrO₄

• 4

• 6

• 8

• 24

What do you call the substances on the left side of a chemical equation?

• yield
• products
• reactants
• compounds

Tags

NGSS.MS-PS1-1