Chemical Reactions 4.1 and 4.2

Which example provides evidence of a chemical change?

• Wood releases ash and smoke when burned.

• Rock particles separate when soil is being sifted.

• Boiling water bubbles when being heated.

• Sugar is not visible when dissolved in water.

When vinegar and baking soda are combined, bubbles and foam are produced.

What evidence demonstrates that a chemical change has occurred?

• A color change occurs.

• A gas is formed.

• A solid is dissolved.

• A precipitate is formed.

the starting materials in a chemical reaction

• Products
• Reactants
• Starters
• Enders

The substances listed on the right side of a chemical equation are the

• Yields
• Reactants
• Products
• Precipitates

The process by which one or more substances change to produce one or more different substances

• Chemical Process

• Reactant

• Chemical Reaction

In the equation,          2Mg + O₂ ---> 2MgO, which are the reactants?

• Mg and O
• MgO
• Mg and MgO
• O and MgO

What are Chemical Reactions?

• It's when you mix substances.
• a process in which atoms rearrange to form new substances
• When something bubbles.
• letter and numbers showing the types and number of atoms

Determined whether the following equation is balanced or unbalanced. Ag + O_{2 --->} 2Ag₂O

• Balanced

• Unbalanced

Determine whether the following equations is balanced or unbalanced. H₄ + O₂ ---> 2H₂O

• Balanced

• Unbalanced

Determine whether the following equation is balanced or unbalanced. H₂ + Br₂ ---> 2HBr

• Balanced

• Unbalanced