Title: Default for 2020SCI22A
Course: 2024 Science 2

Q: Tap water is more expensive than bottled water.
- True
- False
A: False

Q: What percentage of water bottles is recycled?
- 30%
- 100%
- 50%
- 70%
A: 30%

Q: Higher sodium levels can increase blood pressure.
- True
- False
A: True

Q: Hard water is gentler on the skin and gives us softer and fresher fabrics.
- True
- False
A: False

Q: Hard water tastes better than soft water.
- True
- False
A: True

Q: Soft water has less health benefits.
- True
- False
A: True

Q: Soft water can reduce limescale.
- True
- False
A: True

Q: Water softening systems are good for:
- laundry
- reducing water bills
- showering
- drinking
A: laundry; reducing water bills; showering

Q: The more minerals present, the harder the water.
- True
- False
A: True

Q: What does water pick up as it travels from its source and passes through rocks and soil?
- minerals
- fish
- reputation
- chemicals
A: minerals

Q: The build up  of minerals in pipes and faucets that causes blockages is called.
- hair
- Limescale
- beads
- water
A: Limescale

Q: How is hard water transformed into soft water?
- through physical means
- with magic
- with a chemical reaction
A: with a chemical reaction

Q: The ions present in water changes places with _______.
- Sodium
- Barium
- Nitrates
A: Sodium

Q: What is used to change the water ions?
- tin cans
- sulfonated beads
- solvents
A: sulfonated beads

Q: What type of water is found naturally in our area?
- hard water
- soft water
- distilled water
A: hard water

Q: Photosynthesis is a type of endothermic reaction.
- True
- False
A: True

Q: Endothermic reactions.......
- produce and transfer energy into an object.
- produce and transfer energy out of an object.
- can only occur in summer.
- can only occur in winter.
A: produce and transfer energy into an object.

Q: The process of keeping a body warm is an example of an...
- endothermic reaction.
- exothermic reaction.
- selfishness.
A: endothermic reaction.

Q: Which reaction gives off energy to its surroundings?
- an endothermic reaction
- an exothermic reaction.
- an emotional reaction.
A: an exothermic reaction.

Q: Which reaction takes in energy from its surroundings?
- an endothermic reaction.
- an exothermic reaction.
- an emotional reaction.
A: an endothermic reaction.

Q: In an exothermic reaction the thermometer will indicate an increase in temperature.
- True
- False
A: True

Q: In an exothermic reaction the thermometer will indicate a decrease in temperature.
- True
- False
A: False

Q: Which reaction breaks bonds?
- an endothermic reaction
- an exothermic reaction
A: an endothermic reaction

Q: Which reaction is more common?
- an endothermic reaction
- an exothermic reaction
A: an exothermic reaction

Q: Which reaction forms bonds?
- endothermic reactions
- exothermic reactions
A: exothermic reactions

Q: Exothermic reactions are:
- changes that produce more energy than they absorb.
- changes that absorb more energy than they produce.
- found only during winter.
A: changes that produce more energy than they absorb.

Q: Match the word to its definition.
- Products | Substances that are a result of a reaction
- Reactants | Substances that are combined to form a reaction
- Combustion | Process of burning something

Q: Match the exothermic reaction to its correct description.
- Bioluminescence | The combination of luciferin and oxygen
- Digestion | Molecules from food are broken down and sent to the cells to help produce energy.
- Respiration | Process that combines glucose and oxygen to produce energy

Q: Which of the following are exothermic reactions?

NOTE: More than one
- Digestion
- Respiration
- Bioluminescence
- Photosynthesis
A: Digestion; Respiration; Bioluminescence

Q: Reaction rate is...
- the speed of a chemical reaction.
- the amount of reactants.
- the product of a chemical reaction.
- an emotional breakdown.
A: the speed of a chemical reaction.

Q: Temperature is a factor that can influence reaction rates.
- True
- False
A: True

Q: Collision theory states that in chemical reactions:
- particles collide.
- accidents happen.
- new bonds are formed.
- bonds are broken.
A: particles collide.; new bonds are formed.; bonds are broken.

Q: When temperature rises, kinetic energy declines.
- True
- False
A: False

Q: When kinetic energy increases, so does number of collisions.
- True
- False
A: True

Q: When temperature is low, kinetic energy increases.
- True
- False
A: False

Q: When temperature is low, collision and reaction rates decrease.
- True
- False
A: True

Q: What is the surface area of a solid?
- its molecular make up
- the internal structure
- its chemical composition
- the part that is exposed to the environment
A: the part that is exposed to the environment

Q: You can increase surface area of an object by...
- dividing it into smaller pieces.
- changing its state of matter.
- decreasing the temperature.
- making it bigger.
A: dividing it into smaller pieces.

Q: Increased surface area means increased reaction rate.
- True
- False
A: True

Q: Increased surface area means decreased reaction rate.
- True
- False
A: False

Q: Less surface area of reactants means more collisions.
- True
- False
A: False

Q: Increased surface area means increased collisions.
- True
- False
A: True

Q: Which form of a solid has the greatest surface area?
- granule
- cube
- powder
A: powder

Q: Increased collision means increased reaction rates.
- True
- False
A: True

Q: The rate of a chemical reaction can never be characterized by the rate of change in the concentrations of the reactants and products.
- True
- False
A: False

Q: Another word for rate is _____.
A: speed

Q: The rates of most chemical reactions are all about the same.
- True
- False
A: False

Q: Changing concentration only affects the number of particles, but does not affect the energy of the particles.
- True
- False
A: True

Q: Some reactions take hundreds of years to complete while others can happen in less than one second.
- True
- False
A: True

Q: The study of rates of chemical reactions is called ________.
- kinetics
- coordination chemistry
- mechanics
- dynamics
A: kinetics

Q: Which is a correct expression of reaction rate?
- amount/time
- amount/pressure
- distance/time
- time/energy
A: amount/time

Q: Which is a unit of reaction rate?
- M/atm
- J/s
- M/s
- g/mL
A: M/s