1. Chemical Reactions Change Substances

What is the change in properties that allows scientists to identify a chemical reaction has occurred?

• A change in color
• A change in odor
• A change in solubility
• All of the above

What is solubility in the context of chemical reactions?

• The ability of a substance to dissolve in water
• The ability of a substance to change color
• The ability of a substance to change state from solid to liquid
• The ability of a substance to produce a gas

What is the change in solubility that allows scientists to identify a chemical reaction has occurred?

• The substance becomes more soluble in water
• The substance becomes less soluble in water
• The substance becomes colorless in water
• The substance becomes odorless in water

What properties can be used to identify a new substance formed in a chemical reaction?

• Density
• Solubility
• Odor
• All of the above

What is a property that can change during a chemical reaction?

• Density
• Color
• Odor
• All of the above

What is the relationship between reactants and products in a chemical reaction?

• Reactants and products are the same substances
• Reactants and products have no relationship
• Reactants react to produce products
• Products react to produce reactants

What are the products in a chemical reaction?

• The substances that are produced during a chemical reaction
• The substances that are not affected by a chemical reaction
• The new substances that form in chemical reactions
• The substances that exist before a chemical reaction takes place and change as a result of the reaction

What is the type of change that is a chemical reaction?

• A change in state from liquid to solid
• A change in state from gas to solid
• A change in state from liquid to gas
• A change in state from solid to liquid

What is a chemical reaction?

• A change in state from gas to solid
• A change in state from liquid to gas
• A change in state from solid to liquid
• A process in which one or more new substances are formed from one or more other substances

What is the color of lead iodide, a product of a chemical reaction?

• Black
• Colorless
• Yellow
• White