Chemical Reactions

What are the four main types of chemical reactions?

• oxidation, reduction, combustion, and neutralization

• ionization, dissociation, precipitation, and neutralization

• synthesis, decomposition, single displacement, and double displacement

• evaporation, condensation, sublimation, and deposition

Tags

NGSS.HS-PS1-2

Which type of chemical reaction involves the combination of two or more substances to form a new compound?

• Decomposition reaction

• Combustion reaction

• Oxidation reaction

• Synthesis reaction

In an exothermic reaction, does the reaction release or absorb heat?

• absorb

• release

• neutralize

• dissipate

Tags

NGSS.HS-PS1-4

What are the factors that can affect the rate of a chemical reaction?

• Temperature, concentration of reactants, surface area, presence of a catalyst, and pressure (for gases).

• Type of container used, phase of the moon, and distance from the equator

• Color of the reactants, time of day, and humidity

• Number of spectators, type of music playing, and brand of shoes worn

Answer explanation

The substance(s) to the left of the arrow in a chemical equation are called reactants. A reactant is a substance that is present at the start of a chemical reaction. The substance(s) to the right of the arrow are called products. A product is a substance that is present at the end of a chemical reaction.

Tags

NGSS.HS-PS1-5

What is a catalyst in a chemical reaction?

• A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process.

• A catalyst is a substance that has no effect on the rate of a chemical reaction.

• A catalyst is a substance that is consumed in the process of a chemical reaction.

• A catalyst is a substance that decreases the rate of a chemical reaction.

Tags

NGSS.HS-PS1-5

What is an inhibitor in a chemical reaction?

• An inhibitor in a chemical reaction is a substance that completely stops the reaction.

• An inhibitor in a chemical reaction is a substance that has no effect on the rate of the reaction.

• An inhibitor in a chemical reaction is a substance that increases the rate of the reaction.

• An inhibitor in a chemical reaction is a substance that decreases the rate of the reaction.

Tags

NGSS.HS-PS1-5

What are the properties of acids?

• Acids have a salty taste, turn blue litmus paper yellow, and react with metals to produce nitrogen gas.

• Acids have a bitter taste, turn blue litmus paper green, and react with metals to produce carbon dioxide gas.

• Acids have a sweet taste, turn blue litmus paper blue, and react with metals to produce oxygen gas.

• Acids have a sour taste, turn blue litmus paper red, and react with metals to produce hydrogen gas.

Tags

NGSS.MS-PS1-2

What are the properties of bases?

• Bases donate protons or accept protons.

• Bases donate protons or accept pairs of electrons.

• Bases accept protons or donate pairs of electrons.

• Bases donate pairs of electrons or accept pairs of electrons.

Tags

NGSS.HS-PS1-1

What is the pH scale used to measure?

• pressure

• density

• temperature

• acidity or alkalinity

What is the difference between an acid and a base?

• An acid is always corrosive while a base is never corrosive.

• An acid has a sour taste while a base has a bitter taste.

• An acid is a solid while a base is a liquid.

• The main difference between an acid and a base is the type of ions they release when dissolved in water.