Heat and light are released during combustion. The release of heat and light is evidence that combustion is a

Which of the following may signal that a new substance has formed?

The best evidence for a chemical reaction occurring would be:

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

Scientists observe that when lithium reacts with water, two new substances are formed (lithium hydroxide and hydrogen). They predict that the substances formed will have:

Chemical substances often go through physical and chemical changes. Chemical changes are different from physical changes because chemical changes __________.

Select the true statement:

CH4 + 2O2 → CO2 + 2H2O How many products are produced by this reaction?

The combustion reaction of propane can be written in the following balanced chemical equation: C3H8(g) + 5 O2(g) → 3CO2(g) + 4H2O(g) In this reaction, propane (C3H8) is considered one of the __________.

The following chemical equation describes the process of cellular respiration. C6H12O6(s) + 6O2(g) → 6CO2(g) + 6H2O(l) Which of the following is considered a reactant of cellular respiration?

Hydrogen and oxygen combine to form water. In this chemical reaction, which represents the reactant(s)?

An investigator is performing a chemical reaction between potassium metal and chlorine gas to form potassium chloride. In this reaction, the reactant(s)

Photosynthesis is the process by which plants use carbon dioxide, water, and energy from the sun to form oxygen and energy–rich sugar molecules. In this reaction, oxygen and energy–rich sugar molecules are the only __________.

Your science teacher does a demonstration where she mixes together baking soda (sodium bicarbonate) and vinegar (acetic acid). The reaction bubbles up and forms water, carbon dioxide and sodium acetate. The products in this reaction are __________.

The chemical word equation for the process of photosynthesis is: carbon dioxide + water → glucose + oxygen The reactant(s) for the process of photosynthesis

The formation of water from oxygen and hydrogen can be described in the following word equation: oxygen gas+ hydrogen gas → liquid water In this reaction, liquid water is the __________.

In a chemical reaction, in order to make a product, you must either break apart or combine _________.

Cellular respiration is the process by which organisms form energy molecules and carbon dioxide by a chemical reaction between oxygen and glucose. In this reaction, oxygen and glucose are the _________.

The burning of methane gas can be described in the following chemical word equation: methane + oxygen → carbon dioxide + water The product(s) of this equation

You are balancing a chemical equation and you start with 6 H2O molecules. When the equation is balanced, you would expect to have __________ hydrogen atoms accounted for in the products.

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