CCA #2 Review Choose the correct answer and be able to explain why it is correct. Use the hyperlink to see the answers when you are done.

What form of energy do these items use? Mechanical Electrical Light Sound

What form of energy do these items use? Mechanical Electrical Light Sound These devices are both powered by light. The solar panels convert the light into electricity.

Which samples will boil at 100* Celsius? W & Y X only X, Y, Z All

Which samples will boil at 100* Celsius? W & Y X only X, Y, Z All Water will always boil at 100*C. It doesn’t matter how much water you have, the boiling point is constant.

Add water Use a magnet Use a sieve Add heat Wood chips and pieces of glass are mixed in a bowl. Which is the best separation method? Add water Use a magnet Use a sieve Add heat

Add water Use a magnet Use a sieve Add heat Wood chips and pieces of glass are mixed in a bowl. Which is the best separation method? Add water Use a magnet Use a sieve Add heat Wood chips are less dense than water and glass is more dense. Using water would cause the wood to float and the glass to sink making it easy to separate.

Tweezers Magnet Water Strainer I have a mixture of sand and iron filings. Which would be the best way to separate them? Tweezers Magnet Water Strainer

Tweezers Magnet Water Strainer I have a mixture of sand and iron filings. Which would be the best way to separate them? Tweezers Magnet Water Strainer The sizes and shapes are too small to use a strainer or tweezers. Both are more dense than water and neither is soluble. Iron is magnetic and would separate the items easily.

Which part of the bicycle is NOT an example of mechanical energy? Wheels Pedals Gears Reflector

Which part of the bicycle is NOT an example of mechanical energy? Wheels Pedals Gears Reflector Wheels, pedals and gears are all moving parts. The reflector does not move. Mechanical energy is about moving parts.

Which substances are more dense than water? A student mixes 4 different substances in 100 ml of water each. What might the student be testing? Which substances are more dense than water? How much water is needed to make a substance change state? What causes a substance to dissolve? Which substance are solids and which are liquids?

A student mixes 4 different substances in 100 ml of water each A student mixes 4 different substances in 100 ml of water each. What might the student be testing? Which substances are more dense than water? How much water is needed to make a substance change state? What causes a substance to dissolve? Which substance are solids and which are liquids? The variable (the thing the scientist changed) is the different substances. The variable is the subject of the experiment – the main idea. We don’t know what the substances are, so putting them in water would show if they sink or float = density.

Which two forms of energy are causing a change in state of the candle. Electrical & light Electrical & thermal Sound & thermal Solid & liquid

Which two forms of energy are causing a change in state of the candle. Electrical & light Electrical & thermal Sound & thermal Solid & liquid The hair dryer uses electricity to produce thermal energy which changes the state of the candle.

texture taste Color Physical state If I add salt to my soup, which property of the salt will remain the same? texture taste Color Physical state

texture taste Color Physical state If I add salt to my soup, which property of the salt will remain the same? Salt is soluble so most of its physical properties change when it dissolves and spreads out in the soup. Taste is still the same. texture taste Color Physical state

What happens to a Kool-Aid solution if I add more water? The color gets lighter. The taste gets stronger The solution gets evaporated None of the above

What happens to a Kool-Aid solution if I add more water? The color gets lighter. The taste gets stronger The solution gets evaporated None of the above More water will dilute the solution.

Thermal Sound Mechanical Electrical When I strum an acoustic guitar what is the source of the energy being produced? Thermal Sound Mechanical Electrical

Thermal Sound Mechanical Electrical When I strum an acoustic guitar what is the source of the energy being produced? Thermal Sound Mechanical Electrical Source is the beginning. Sound is produced by the mechanical energy of the strumming.

Light and sound Mechanical and light Mechanical and sound Dolphins have the ability to send echoes out into the ocean to find prey and avoid danger. When a dolphin is swimming and hunting, which two types of energy is it using? Light and sound Mechanical and light Mechanical and sound Light and Mechanical

Light and sound Mechanical and light Mechanical and sound Dolphins have the ability to send echoes out into the ocean to find prey and avoid danger. When a dolphin is swimming and hunting, which two types of energy is it using? Swimming requires movement – mechanical. Echoes require sound. Light and sound Mechanical and light Mechanical and sound Light and Mechanical

One day in February, I walked outside and noticed that the water in the dog’s bowl was solid. What is the best estimate of the temperature outside at that time? 10* C 100* C 0* C 25*C

One day in February, I walked outside and noticed that the water in the dog’s bowl was solid. What is the best estimate of the temperature outside at that time? Water freezes at 0* C. 10* C 100* C 0* C 25*C

Sound Light Electrical Mechanical If this hose is sprayed at the pinwheel, the flowing water would make the wheel spin. What type of energy is being demonstrated? Sound Light Electrical Mechanical

Sound Light Electrical Mechanical If this hose is sprayed at the pinwheel, the flowing water would make the wheel spin. What type of energy is being demonstrated? Sound Light Electrical Mechanical The water is causing movement of the wheel.

They are all less dense than water They are all soluble Which statement is true about a mixture that is made up of iron nails, plastic rings and wooden beads? They are all magnetic They are all less dense than water They are all soluble They are all solids

They are all less dense than water They are all soluble Which statement is true about a mixture that is made up of iron nails, plastic rings and wooden beads? Only the iron They are all magnetic They are all less dense than water They are all soluble They are all solids Only the wooden beads and the plastic rings None of them.