8.23 Chemistry Test

Which of the following is not true about atoms?

• A. They make up all matter

• B. They are listed on the periodic table

• C. They come in different types

• D. They are larger than molecules

Which of the following is an example of an element

• A. Water

• B. Salt

• C. Potassium

• D. Carbon dioxide

Date: A compound consists of one copper atom, one carbon atom and three oxygen atoms, its chemical formula would be?

• A. CUCO3

• B. COCO

• C. CUCO

• D. CCO3

When you explode a balloon of hydrogen gas the following chemical reaction occurs Hydrogen gas + Oxygen gas → Water vapour What are the product/s of this reaction?

• A. Hydrogen gas

• B. Oxygen gas

• C. Water vapour

• D. Hydrogen gas and oxygen gas

The key difference between a compound and a mixture is ...

Use the Periodic Table to identify the following elements

a) The element with the symbol Na

b) The element with the atomic number 7

c) The element in group 2 period 2

d) An element that is a metal

e) An element that is a non-metal

Explain the difference between an element and a compound, use examples to support your explanation.

Explain why molecules can be considered either elements or compounds?

Lucas and Luci performed an experiment to observe a chemical reaction.

They took a small piece of Magnesium metal (Mg) and added it to a test tube of hydrochloric acid (HCI).

The reaction produced hydrogen gas and a solution of Magnesium Chloride (MgCl₂) and the test tube became warm to the touch.

a) What signs of a chemical reaction would Lucas and Luci have observed?

b) What are the reactants for this reaction?

c) What are the products of this reaction?

d) Write the word equation for this reaction?

e) Write the symbol equation for the reaction?