Year 7 Chemical Reactions MC Quiz

What is the difference between a group and a period on the periodic table?

• A group is a vertical column and a period is a horizontal row

• A group is a vertical row and a period is a horizontal column

• A group is a row and a period is a column

• A period is a number at the top of the square and a group is a number at the bottom of the square

What is the difference between a compound and a mixture?

• A compound contains only one type of element

• A mixture is 2 or more elements or compounds not chemically bonded

• A mixture is 2 or more elements or compounds that are chemically bonded

• A compound is 2 or more elements not chemically bonded

Which of the following answer (s)  is a compound?

• Oxygen

•  $CO_2$  

•  $N_2$  

• Water

Which state of matter has the most energy?

• Gas

• Solid

• Liquid

Which statement (s) show the correct changes of state?

• Condensation

• Melting

• Freezing

• Separation

What is the difference between a chemical and physical change?

• A chemical change is irreversible

• A physical change is irreversible

• A chemical change is reversible

• A physical change involves elements

Acid + Alkali -->

• Salt

• Water

• Water + salt

• Water + carbon dioxide

What is the pH scale?

• Measures if a substance is a compound or a mixture

• Measure how magnetic a substance is

• Measures how flammable a substance is

• Measures how acidic a substance is

Which of the following substances are acids?

• Lemon Juice

• Bleach

• Vinegar

• Baking powder

Which of the following substances are alkalis?

• Lemon Juice

• Bleach

• Vinegar

• Baking powder