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science final rev #1
7th grade physical science
| Question | Answer |
|---|---|
| Waves always transfer what? | energy |
| What are particles of matter made up of? | atoms |
| Do molecules ever stop moving? | no |
| Molecules are spaced out the farthest in what state of matter? | gas |
| Molecular bonds are strongest between...? | solids |
| Which is a physical reaction? wood burning, milk souring, or ice melting? | ice melting |
| What happens to the mass of the liquid in a thermometer as the liquid rises in the thermometer? | stays the same |
| What do scientists use to determine the properties of elements? | periodic table |
| When wax becomes a solid what is happening? | connection between the wax particles changes |
| Which property of a substance determines if a substance is a solid or liquid at room temperature? | melting point |
| Which of the following always results from a chemical reaction? fire, bubbles, or a new substance that can be solid, liquid or gas | a new substance that can be liquid, solid, or gas |
| Hydrogen gas is released, and zinc chloride is formed from mixing hydrochloric acid and a piece of zinc together. Is this a physical or chemical reaction? | chemical reaction |
| Metals like copper are good or bad conductors of heat and electricity? | good |
| What is an example of matter? heat, radiation, or water | water |
| Which particles move faster? particles in hard lava, or particles in liquid lava? | particles in liquid lava |
| People wear sunglasses in the winter because snow (reflects, refracts, or diffracts) the sun. | reflects |
| When substances change state what happens to the molecules? the mass changes, the shape changes or the connection changes | the connection between molecules changes |
| What is the easiest way to separate sand and iron? | a magnet |
| Which is an example of a chemical change? salt in water, melting gold, or burning wood | burning wood |
| Which process transfers heat when particles collide in a solid? | conduction |
| Absorbing heat energy happens in which phase change? | solid to a liquid |
| What is the acceleration of gravity? | 9.8 m/s2 (meters per second squared) |
| Sound is unable to travel through what? | a vacuum |
| X-ray and ultraviolet are what kind of energy? | electromagnetic |
| What is the average speed if the distance is 30m and the time is 5seconds? | 6m/s (distance divided by time) |
| How long will it take me if I am going 80km/hr and must go 350km? | about 4.5 hours (distance divided by speed) |
| Gravitational pull depends on the (mass, shape, temperature) of the object and the distance between them? | mass |
| How do we find density? | mass divided by volume |
| If you have a chunk of silver and know its density is 10.5 g/cm3 and its mass is 1g, but you cut it in half, what will be its density now? | 10.5g/cm3 (density does not change when mass changes) |
| Which one represents the proper velocity of a moving object? 40m/s, 40 m north, or 40m/s north? | 40 m/s north |
| You can jump higher on the Moon than on earth. Why? | less gravitational force |
| I am parked on a hill. What prevents the car from rolling? | the friction between the tires and the road |
| Gases can be compressed but solids cannot. Why? | there is empty space between gases and there's less space in solids |
| When a driver is driving down the road and hits the brake for something in the road, they lurch forward but the seatbelt keeps them from flying out of the car. Which of Newton's law is this? | third |
Created by:
hms108
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