Science Fusion Grade 8 Model H Unit 4 Practice Quiz

Which of the following foods contains complex carbohydrates?

• potato

• fruit juice

• corn syrup

• table sugar

Ethane (C2H6) is one of many compounds that burns in oxygen to form carbon dioxide and water, as represented by the equation below. Which substance is a product in this reaction? C2H6+O2 --> CO2+H2O

• carbon (C)

• oxygen (O₂)

• water (H₂O)

• ethane (C₂H₆)

Which of the following best distinguishes a nuclear reaction from other types of reactions?

• a reaction in which energy is released

• a reaction in which electrons are shared

• a reaction in which electrons are transferred

• a reaction that affects the nucleus of an atom

The image above shows a chemical reaction taking place. What can you infer about this reaction?

• mass is not conserved

• the reaction is exothermic

• the reaction is endothermic

• there are reactants but no products

Which change will most likely lead to an increase in the rate of a chemical reaction?

• removing a catalyst

• lowering the temperature

• increasing the surface area of reactants

• decreasing the concentration of reactants

Glucose (C₆H₁₂O₆) is a kind of sugar molecule. How many atoms are in a molecule of glucose?

• 6

• 12

• 18

• 24

The following chemical reactions represent two different chemical reactions:

₃NaOH+H₃PO₄ --> Na₃PO₄+3H₂O

2Mg+O₂ --> 2MgO

Based on these equations, which statement is true?

• MgO is a reactant in one of the chemical reactions

• Na₃PO₄ is a product in one of the chemical reactions

• H₃PO₄ shows that three atoms of oxygen are involved in the reaction

• O₂ is a catalyst

Which statement about carbon molecules is true?

• They may take the form of rings

• They never take the form of rings

• They always take the form of long chains

• They rarely contain more than two carbon atoms

Carbon-6 undergoes beta-minus decay, during which a neutron becomes a proton, an electron, and an antineutrino. What happens to the carbon atom during this process?

• Its mass number increases by 1

• Its mass number decreases by 1

• Its atomic number increases by 1

• Its atomic number decreases by 1

What is the source of the large amount of energy produced in a nuclear fission reaction?

• Some mas is converted to energy

• Energy for fission reactions is provided by the sun

• The Earth's oceans provide water used in fission reactions

• Electrons from large atoms are converted into gamma rays