Chemical Reactions Jeopardy

This sign that a chemical reaction is happening occurs when a mixture suddenly gets noticeably hotter or colder to the touch.

What is a temperature change?

This visible sign of a chemical reaction happens when a mixture suddenly changes to a different hue, such as turning from clear to blue.

What is a color change?

This sign of a chemical reaction appears as bubbles rising through a liquid, showing that a gas is being produced.

What is gas production?

This sign of a chemical reaction occurs when dissolved particles suddenly clump together and settle out of a solution as a solid.

What is a precipitate?

Because a chemical reaction only rearranges atoms into new substances, this law states that the total mass of the reactants must equal the total mass of the products.

What is the law of conservation of mass?

In this type of reaction, two or more simple substances combine to form a single, more complex product.

What is a synthesis reaction?

In this type of reaction, a single compound breaks apart into two or more simpler substances.

What is a decomposition reaction?

In this type of reaction, one element takes the place of another element within a compound.

What is a single-replacement reaction?

In this type of reaction, a fuel combines quickly with oxygen, releasing heat and light, as in a burning campfire.

What is combustion?

In this type of reaction, the positive and negative ions of two compounds essentially trade partners, often forming a solid precipitate.

What is a double-replacement reaction?

This is the term for the small number placed in front of a chemical formula to show how many units of that substance are involved in a reaction.

What is a coefficient?

In a chemical formula like H2O, this is the term for the small number written below and after an element's symbol, showing how many atoms of that element are in the molecule.

What is a subscript?

This term describes a chemical equation in which the number of atoms of every element is equal on both the reactant side and the product side.

What is a balanced equation?

In the balanced equation 2H2 + O2 makes 2H2O, this is the total number of hydrogen atoms shown on the reactant side.

What is four?

To balance the combustion of methane, CH4 + __O2 makes CO2 + 2H2O, this whole number belongs in the blank in front of the oxygen gas.

What is two?

These are the starting substances in a chemical reaction, found on the left side of the arrow in a chemical equation.

What are reactants?

These are the new substances formed by a chemical reaction, found on the right side of the arrow in a chemical equation.

What are products?

This substance speeds up a chemical reaction without itself being used up or permanently changed by it.

What is a catalyst?

In the reaction that forms rust, iron and this gas from the air are the two reactants that combine to form iron oxide.

What is oxygen?

In the combustion of a hydrocarbon fuel, carbon dioxide and this liquid or gas are the two main products released.

What is water?

This term describes a chemical reaction that releases energy, usually as heat, making the surroundings feel warmer.

What is an exothermic reaction?

This term describes a chemical reaction that absorbs energy from its surroundings, often making the surroundings feel cooler.

What is an endothermic reaction?

This is the minimum amount of energy needed to get a chemical reaction started.

What is activation energy?

Breaking the chemical bonds that hold reactant molecules together always requires this, while forming new bonds in the products always releases it.

What is energy?

This diagram plots the energy of a reaction over time, showing reactants rising to a peak before dropping to the energy level of the products.

What is a potential energy diagram?

Before handling any chemicals in the lab, you should always put on this protective eyewear to shield your eyes from splashes.

What are safety goggles?

This lab garment, worn over your clothes, protects your skin and clothing from chemical spills.

What is a lab apron?

If a chemical splashes into your eyes during a lab, this piece of safety equipment should be used immediately to flush them with water.

What is an eyewash station?

This document lists the hazards, handling instructions, and emergency procedures for a specific chemical.

What is a safety data sheet?

This piece of emergency equipment, usually mounted on the wall or ceiling of a lab, releases a large volume of water over a person whose clothing has caught fire or been contaminated.

What is a safety shower?