Reactions Test Review

In a chemical equation, the symbol that means dissolved in water is _____

• (s)

• (l)

• (g)

• (aq)

A teacher wants to demonstrate a chemical reaction for her students. Which activity below would best demonstrate a chemical reaction?

• Placing metal in an acid to create gas

• Measuring the densities of water and ice

• Melting a solid piece of aluminum

• Filling a balloon with helium gas

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When a sugar reacts with potassium chlorate, it releases light into the environment. This type of reaction is _____

• endothermic

• exothermic

• endergonic

• exergonic

Tags

NGSS.HS-PS1-4

Which of the following observations does NOT indicate that a chemical reaction has occurred?

• formation of a precipitate

• production of a gas

• state of matter change

• heat and light released

Tags

NGSS.MS-PS1-2

What is the general form for a single-replacement reaction?

• AX + BY → AY + BX

• AB → A + B

• A + B → AB

• A + BX → AX + B

What is the general form for a double-displacement reaction?

• AX + BY → AY + BX

• AB → A + B

• A + B → AB

• A + BX → AX + B

Which of the following is a correctly balanced chemical equation?

• Cl₂ + 2NaI → 2NaCl + I₂

• Cl₂ + NaI → NaCl + 2I₂

• Cl₂ + NaI → NaCl + I₂

• 2Cl₂ + NaI → 2NaCl + I₂

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which situation provides the best evidence that a chemical reaction is taking place?

• A. A metal strip bends when heated

• B. A solution freezes in the freezer

• C. Two solutions mixed in a beaker produce a solid

• D. A chemical is dissolved in water

Tags

NGSS.MS-PS1-2

In a reaction in which hydrogen reacts with oxygen to produce water, which substances are the reactants?

• Hydrogen only

• Oxygen only

• Water only

• Both hydrogen and oxygen

Tags

NGSS.MS-PS1-5

Which of the following is NOT an example of a chemical change?

• Iron rusting

• Cutting paper

• An apple ripening

• A piece of wood burning

Tags

NGSS.MS-PS1-2