REVIEW QUIZ SCI 10

Which statement best describes a physical change?

• A new substance is formed

• The material reacts with another substance

• The change can often be reversed

• Energy is always absorbed

Which of the following is an example of a physical change?

• Burning wood

• Rusting of iron

• Melting ice

• Baking a cake

When a metal is exposed to oxygen and forms rust, it undergoes a:

• Physical change

• Chemical change

• No change

• Mechanical change

Which of the following materials undergoes chemical change?

• Cutting of stainless metal plates

• crushing chunks of ice

• dissolving sugar in water

• rotting of tomatoes

Some changes are readily observable when chemical reactions take place. Which of the following evidences of chemical change explains the curdling of milk?

• evolution of heat and light

• evolution of gas

• formation of a precipitate

• production of mechanical energy

What is a chemical equation?

• A mathematical formula to calculate reaction rates

• A symbol used to represent a chemical change

• A representation of a chemical reaction using symbols and formulas

• A measurement of the concentration of reactants

Which of the following is NOT part of a chemical equation?

• Reactants

• Products

• Coefficients

• Pressure values

Chemical changes are always represented by chemical equation. What entities are usually located on the right hand side of a chemical equation?

• Coefficient

• Reactant/s

• Product/s

• Subscript

What is/are the reactant(s) in the given reaction? 6O2 + C6H12O6 → 6CO2 + 6H2O + ENERGY

• CO2 + H2O

• O2 + C6H12O6

• CO2

• C6H12O6

What are the products in the equation? Sucrose (C12H22O11) + oxygen → carbon dioxide + water + heat

• carbon dioxide and oxygen

• oxygen and water

• carbon dioxide, water and heat

• sucrose and oxygen