Diez Science Post Test!!!

According to the graph, how many students received an 90 for their first semester grade?

6

Based on the data, what is the optimal amount of new fertilizer to maximize corn output?

8 kgs per acre

Sally was trying to calculate the speed of the hummingbirds feeding outside her window. Sally measured the distance from one feeder to the next, 24 meters. Then she sat and timed how long it took a hummingbird to fly from one feeder to the next. She timed 10 trials and calculated the average time, 3 seconds. What was the average speed of the hummingbird flying from one feeder to the other?

8 m/s

Based on the diagram of a roller coaster track, what statement is true?

A car at point B has more kinetic energy than the car at point D.

In which situation is the object experiencing unbalanced forces?

A car slowing as it reaches a traffic light.

When two or more substances combine, but each keeps its own properties, the new combination is called a(an)

Mixture

Assume the can contains cola. The cola is an example a(n)

Mixture

If an ice cube with the mass of 5.0 grams melts in a closed system such as a closed glass jar, what is the mass of the liquid water after the ice cube completely melts?

5.0 grams

Which is a property of a neutron?

0 charge

A 1 kg block of copper is hammered into a thin sheet. The length of the copper sheet is 30 cm. What is the mass of the copper sheet?

1 kg

Ben and Jerry went for a drive. They decided to stop for a snack and have some ice cream. How long did they stop at the store to eat ice cream?

1/2 hour

Three different dynamic carts of different masses are rolled down a ramp. The heaviest one rolls down the ramp the fastest. Before concluding that a more massive cart will roll down a ramp faster, what experiment with these three carts might you want to do?

Add masses to each car until they have the same mass, then test the carts again.

Which ball is moving with the fastest speed?

Ball 1

A teacher attaches a ball to a meter long string and whirls it around in a horizontal circle at constant speed. The teacher explains that the string is what makes the ball go in a circle. Why is the string necessary?

Circle motion requires a force to give it a centripetal acceleration.

Which type of energy transformation does NOT describe potential energy being changed into kinetic energy?

Compressing a spring

What is a physical property of silver?

Density

Al was helping his sister, Betsy, slide down the slide at the park. She held on to the sides of the slide the whole way down. When they got to the bottom, she noticed that her hands were warm. What caused Betsy's hands to be warm?

Friction

You have probably seen someone rubbing their hands together when they are cold. Or, maybe you have done this yourself. If you have, you know that rubbing your hands together quickly can create heat that warms them up. The force responsible for generating this heat is...

Friction

The tendency of two masses alone in the universe to drift together is a result of...

Gravity

If you go outside on a hot summer day with a double scoop ice cream cone, how will the cold ice cream interact with the hot outside air?

Heat from the air will move to the ice cream.

If the masses of objects increase and their distance from each other remains the same, then the force of gravity between the two objects...

Increases

Mike, Jackie, Jeremy, and Nicki were widely known to the be the fastest fifth graders at Robinson Elementary School. They wanted to know who is the fastest so they scheduled a race during recess. Their results are shown in the table. Who is the fastest student?

Jackie

You have been given a ruler to measure a block of wood. What property of the wood will you be able to measure?

Length

According to the pH chart, which is the strongest base?

NaOH

Which sub-atomic particle is positively charged and found in the nucleus?

Proton

You are able to see yourself in the mirror because of the wave property of

Reflection

The change in direction of the Sun's light as shown here is an example of...

Refraction

If a scientific experiment repeatedly gives the same results, the experiment is...

Reliable

Which tools would be necessary to determine whether or not a large regular block will float, without using water?

Ruler and Balance

Determine the identity of a cube of metal that measures 1.5 cm on each side and has a mass of 35.45g.

Silver

In which state of matter are the particles CLOSEST together?

Solid

How can a megaphone used by a cheerleader allow people on the opposite side of a field to hear her better?

Solid objects can change the direction of sound waves; megaphones allow users to determine the general direction of the sound.

When Lisa placed a balloon to her ear, she was able to hear what her sister was whispering from the other side of the room. When she removed the balloon, she was no longer able to hear what her sister was saying. What is the best explanation for what Lisa discovered?

Sound does not travel around the air outside of the balloon as well as it does through the denser air pressure inside the balloon.

An old movie poster used a quote "In space, no one can hear you scream!" Why this is true or not true?

Sound needs a medium for the wave to vibrate and there is nothing in space to vibrate.

Maria and Miquel were enjoying the fireworks when they got into a chemistry argument. Maria insisted that the fireworks were the result of a chemical reaction. Miguel disagreed. What would you tell them to solve this argument?

The color changes and the release of energy indicate a chemical reaction.

Suppose you place an ice cube into a cup of hot tea? What will happen to the temperature of the ice cube and the tea?

The ice will melt and the temperature of the tea will drop quickly; then the change will slow until equilibrium is reached.

Compare the mass of an ice cube to the mass of the water once the cube is completely melted.

The mass of water formed equals the mass of ice.

A balloon is filled with water. The balloon is heated and begins to expand. The water inside begins to turn into steam. What will happen to the mass of the balloon?

The mass will stay the same

A basketball rolls to a stop along a gym floor without anyone touching it. What answer choice BEST explains why this occurred?

The opposing force of friction stopped the ball.

Which is an example of an atom?

The smallest unit of Ne.

Which phase of matter would transmit sound waves the fastest, and why?

The solid would transmit the fastest because the particles are closest together.

Mel was measuring the volume of water in this 25 ml graduated cylinder. He wanted to measure 13.7 ml as accurately as possible. What advice would you give Mel before starting to measure the water?

Use a cylinder with .1 ml increments.

Which is an example of electrical energy being converted or changed into light energy?

a light bulb

Heat would best be transferred by conduction between...

a stove and a copper pot

The process by which hot and cold air are transferred in the atmosphere is...

convection

Newton's first law of motion tells us that an object will move _________ unless acted on by an unbalanced force.

in a straight line

What is a scientific theory

is a well-supported, widely accepted explanation.

The number of molecular collisions increases when...

more reactants are added.

As a roller coaster goes downhill...

potential energy is converted into kinetic energy.

Whenever there is a change of state, such as a solid to liquid or liquid to gas, heat energy can be added without a temperature change because

the change of state requires energy.