Front

What is a chemical change in the digestive process?

Back

A chemical change in the digestive process occurs when enzymes within the small intestines break down food into smaller molecules.

Front

According to the law of conservation of mass, what happens to the weight of products after a chemical change?

Back

The weight of the products after a chemical change will equal the total weight of the reactants. For example, if a mixture weighs 10g and another weighs 15g, the total weight after mixing will be 25g.

Front

How many atoms of each element are present in the reaction: Cu + 2AgNO₃ → 2Ag + Cu(NO₃)₂?

Back

There are 2 Ag atoms, 1 Cu atom, 2 N atoms, and 6 O atoms in the products.

Front

What is a chemical property of rocks?

Back

A chemical property of rocks is their reaction to acid, such as bubbling when a drop of acid is added.

Front

What elements are present in sulfuric acid (H₂SO₄)?

Back

Sulfuric acid contains Hydrogen, Sulfur, and Oxygen.

Front

What is the role of enzymes in digestion?

Back

Enzymes facilitate chemical changes by breaking down food into smaller, absorbable molecules.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; it remains constant.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance without changing its chemical composition, while a chemical change results in the formation of new substances.

Front

What is an example of a physical change?

Back

An example of a physical change is melting ice into water.

Front

What is an example of a chemical reaction?

Back

An example of a chemical reaction is the rusting of iron.