Unit B - Matter and Chemical Change

Air is a mixture of many gases, some of which are elements, some of which are compounds. Four of the most important gases are nitrogen, carbon dioxide, water vapour, and oxygen.

Which of the following pairs are both elements?

• Nitrogen and Water Vapour

• Oxygen and Carbon Dioxide

• Carbon Dioxide and Water Vapour

• Oxygen and Nitrogen

Here are some examples of properties:

1) Luster

2) Conductivity

3) Ability to Burn

4) Solubility

Which of the following is a chemical property?

• 1

• 2

• 3

• 4

Which of the following is not an indication of a chemical change?

• The formation of a solid after mixing two solutions.

• Energy is releasing causing the temperature to decrease.

• The substance changes colour.

• The substance changes from a liquid to a gas.

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Photosynthesis:

Carbon Dioxide + Water + Sunlight → Sugar + Oxygen

Cellular Respiration:

Sugar + Oxygen → Carbon Dioxide + Water + Heat (Energy)

What can you conclude from the information above?

• Photosynthesis is an endothermic reaction; Cellular Respiration is an exothermic reaction.

• Both Photosynthesis and Cellular Respiration are exothermic reactions.

• Both Photosynthesis and Cellular Respiration are endothermic reactions.

• Photosynthesis is an exothermic reaction; Cellular Respiration is an endothermic reaction.

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Andy was studying for her chemistry test and wrote down some properties of the smaller particles in an atom:

1) Electrons are negatively charged and orbit the nucleus

2) Neutrons are located in the nucleus and have a charge

3) Protons and Neutrons contribute to the atomic mass

4) Protons are positively charged and are found in the nucleus

Andy's list is correct except for:

• 1

• 2

• 3

• 4

The atomic number of Oxygen indicates that:

• There are 8 protons in the nucleus

• There are 8 neutrons in the nucleus

• There are 8 electrons in the nucleus

• There are 8 electron shells

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A neutral lithium atom has:

• 3 electrons and 3 neutrons

• 3 protons and 3 electrons

• 3 protons and 2 electrons

• 3 protons and 3 neutrons

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Chlorine has:

• 17 protons, 17 electrons, and 18 neutrons

• 35 protons, 35 electrons, and 17 neutrons

• 17 protons, 17 electrons, and 52 neutrons

• 18 protons, 18 electrons, and 18 neutrons

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Which of the following statements about Barium, Calcium, and Magnesium is true?

• They have the same number of protons

• They have the same number of neutrons

• They are gases at room temperature

• They react with other substances in a similar way

The chemical formula for urea, a product in lawn fertilizers is NH₂CONH₂

The chemical formula for malachite, a mineral in rocks is Cu₂OHCO₃OH

How many more hydrogen atoms does urea have when compared to malachite?

• 1

• 2

• 3

• 4

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NGSS.MS-PS1-1