The chart represents properties of ...

A student is attempting to explain the differences between elements and compounds. Which of the following statements are true for elements? Select TWO correct answers.

What kind of pure substance forms when two or more different elements are chemically combined and are represented by a chemical formula?

To explain the difference between elements and compounds, a teacher filled clear boxes with balls. Which box best represents a sample of an element?

Ryan is using the chemical formulas for various substances to classify them either as a compound or an element. Which of the following should be identify as a compound?

Which element, that is essential for human life, is found in large amounts in both Earth's atmosphere and oceans?

A student entered the following chart in his science journal. Which element could correctly replace the question mark on the chart?

Which element makes up a large portion of the atmosphere and living matter, but NOT the ocean?

Fill in the blank with the correct word.

A _____ change takes place when two or more substances combine and a new substance forms.

Fill in the blank with the correct word.

A _____ change happens when two or more substances combine and no new substance is formed.

Beth had a beaker with a small amount of baking soda. She added a few drops of pickle juice to the baking soda and observed fizzing and bubbling. Based on her observation, which of these can Marie determine about the new substance formed by mixing the baking soda and pickle juice?

The diagram shows two bowling balls of equal mass. Ball A is resting near the edge of a shelf. Ball B is resting on the ground below.

Which of these statements BEST describes the diagram?

This is energy that is stored in an object due to its position relative to another position. The stored energy depends on the relative position of other objects in the system. Examples include: the stretched elastic in a bow or a rock sitting on the edge of a cliff.

This is _______ energy.

This is the energy of motion and can be observed as the movement of an object. An object in motion uses this type of energy. Examples include: a person walking or a crumb falling off a table.

This is _______ energy.

A skateboarder travels from location 1 to location 4. At which location does the skateboarder have the most kinetic energy and the least potential energy?

The diagram shows the path of a student on a sled starting from rest at point W.

The student slides down a frictionless, snow-covered hill past point Z, which is a ground level.

Which of the following statements best describes the energy of the student and sled from point W to point Z?

Four forces are acting on a box shown in the diagram. This box will increase in speed

Four students push on a block of wood with the forces shown in the diagram. Assume friction is negligible. The block slides horizontally.

What is the net force acting on the block of wood?

A wooden block is attached to the two spring scales. The numbers on the spring scales show how much force (in newtons) is pulling on the springs.

What amount of force is the block being pulled to the left? ____ Newtons

A wooden block is attached to the two spring scales. The numbers on the spring scales show how much force (in newtons) is pulling on the springs.

What amount of force is the block being pulled to the right? ____ Newtons

A wooden block is attached to the two spring scales. The numbers on the spring scales show how much force (in newtons) is pulling on the springs.

In which direction will the wooden block move?

Left or Right?

A toy car rolls 8 meters in 2 seconds.

The average speed of the toy car is _____ m/s.

Reed, Riley, Ean and Michael want to run a race against each other. They start on the 20 yard line of the football field and finish at the 50 yard line. The times for them to complete the race are listed in the table.

Which of the boys ran the race at an average speed of 5 yards per second?

The graph shows a car's distance along a straight road at any given time.

What is the average speed of the car?

The moon orbits the Earth. During the course of this revolution, the moon's speed remains constant at 3600 km/h.

Which graph below BEST illustrates the moon's speed over time?

Which of the following inclined planes would require the least amount of force to lift a box?

Juanita's moving company just bought a new truck. The truck needs a new ramp that will make it easier to push the dollies up into the truck. Which ramp should Juanita avoid because it would require the most amount of force when using the dollies?

Many moving truck companies advertise that their trucks are the easiest to load. If we assume that the height of the truck is the same for each company, which company would have the truck that is actually easiest to load?