Weight of a System
If you burn a piece of wood weighing 2 Kilograms, what happens to the total weight of the ash, smoke, and gases?
It stays the same.
If you mix lemon juice and baking soda and observe fizzing, what has occurred?
A. The substance froze.
B. A physical change with no new substance.
C. A chemical reaction forming a new substance.
D. The baking soda melted.
C. A chemical reaction forming a new substance.
Why is metal used for cooking pots?
It heats up quickly and spreads heat evenly.
A. The ball will roll faster on the grass
B. The ball will roll the same distance on both surfaces.
C. The ball will stop immediately on the grass
D. The ball will roll father on the smooth floor.
D. The ball will roll father on the smooth floor.
You melt a 500-gram block of ice into water. What will the weight of the water be?
500 Grams
Which of the following is an example of mixing that does NOT create a new substance?
A. Sand and water
B. Baking soda and vinegar
C. Milk and Lemon Juice
D. Burning Wood
A. Sand and water
What happens to a candle when it is heated?
A. The wax melts and can flow as a liquid.
B. The wax becomes solid.
C. The wax disappears instantly.
D. The wick turns into water.
The wax melts and can flow as a liquid.
Which of these shows the effect of gravity?
A. A kite floating in the sky.
B. A ball rolling down a hill.
C. A car slowing down on a flat surface.
D. A magnet attracting a nail
B. A ball rolling down a hill.
Which of the following terms describe the term position?
A. the direction an object is moving
B. The location of an object compared ot a reference point
C. The distance an object travels over time
D. The speed of an object.
B. The location of an object compared ot a reference point
You dissolved 50 grams of salt in 300 grams of water. What is the weight of the solution?
350 Grams
A. It becomes a new substance
B. It disolves but stays the same substance
C. It turns into a gas.
D. It disappears completely
B. It dissolves but stays the same substance.
Why do bridges often have small gaps between sections?
A. To let water drain through and prevent flooding.
B. To allow metal to expand and contract with heating and cooling.
C. To save materials.
D. To prevent cars from skidding.
B. To allow metal to expand and contract with heating and cooling.
What happens if you roll a ball on a perfectly smooth and flat surface with no friction?
A. The ball would roll forever.
B. The ball would stop quickly.
C. The ball would bounce.
D. The ball would roll slower and slower
A. The ball would roll forever.
A train travels 100 Kilometers in 2 hours. If it continues at the same speed, how far will it travel in 5 hours?
250 Kilometers
What is the best tool to measure the weight of an object before and after an interaction?
A. Thermometer
B. Ruler
C. Balance scale
D. Stopwatch
C. Balanced Scale
If you mix food coloring with water, what happens?
A. A new substance is formed.
B. The water turns into a solid.
C. The substance stays the same but looks different.
D. The food coloring evaporates.
C. The substance stays the same but looks different.
What happens to water when it is cooled below O degrees Celsius or 32 degrees F?
A. It evaporates
B. It stays the same,
C. It disappears.
D. It turns to ice.
D. It turns to ice.
Which force makes it harder to push a heavy box across a carpet?
A. Gravity
B. Magnetism
C. Friction
D. Air Resistance
C. Friction
5 meters per second.
If you bake a cake and notice it becomes lighter, what might have caused the changed?
A. Water turned into steam and escape
B. The oven made it heavier
C. The ingredients melted together.
D. The cake expanded.
A. Water turned into steam and escape.
Which observation shows that a new substance has been formed?
A. A color change happens without adding dye.
B. The mixture is stirred.
C. The substance separates after mixing.
D. The mixture is filtered.
A. A color change happens without adding dye.
What happens to most materials when they are heated?
A. They become smaller.
B. They expand or get bigger.
C. They turn into liquid
D. They disappear.
B. They expand or get bigger.
A toy car is placed at the top of a ramp and allowed to roll down. The ramp is covered with different materials: smooth plastic, rough sandpaper, and soft carpet. After testing, the car rolls farthest on the smooth plastic. Why does the car roll farther on the smooth plastic?
There is less friction to slow the car down.
Why do parachutes slow down a skydiver?
Friction between the air and the parachute slows their fall.