The figure below shows how the word "ambulance" is painted on the front of some vehicles so that it reads correctly in the rearview mirror that is attached to the windshield of a car driving in front of the ambulance. The word is painted this way because the mirror

The weight of a person on Earth is 6 times his or her weight on the Moon. What type of force is responsible for a person's weight?

A large number of iron nails were kept in containers in a humid room. Some of the containers were open, and some were airtight. Sixty percent of the nails kept in open containers developed rust. Which of the following would be MOST important to know in order to draw a conclusion about whether the humidity might have contributed to the rusting?

A piece of blue paper appears blue because the paper

Which of the following is an example of a situation in which exothermic chemical reactions occur?

Why did Dimitri Mendeleev use atomic masses instead of atomic numbers to organize his first periodic table in 1869?

In the absence of air resistance, which of these objects will fall at the fastest rate when dropped?

Four people are pulling on a box with the forces shown below. If there are no other forces on the box, in what direction will it move?

Which of the following situations violates the law of conservation of energy?

Use the diagram of a lens to answer the question. Parallel rays of light pass through the lens shown above. Which of the following diagrams BEST shows the path of the rays emerging from the right side of the lens?

A helicopter is moving past some clouds at a velocity of 5 km/hr north relative to the clouds. The clouds are moving past the ground at a velocity of 3.5 km/hr north. How fast is the helicopter going past the ground?

In a restaurant kitchen, lamps are used to keep food warm. Which type of electromagnetic radiation do the lamps emit that is primarily responsible for keeping the food warm?

The International System of Units (SI) is a standardized system of measurement used to express fundamental quantities in metric units. Which of the following metric units are used to measure the fundamental quantities of length, mass, and time, respectively, in the SI system?

Which of the following is the BEST representation of molecules of water vapor?

Carbon atoms can link themselves together into long chains and rings to form a vast number of highly complicated molecules. Which of the following statements BEST explains why carbon atoms behave this way?

An aluminum bar was found to have a mass of 27 g. Using water displacement, the volume was measured to be 10 mL. What is the density of the aluminum?

Examine the drawing of a water molecule.

The melting of wax is a physical change, yet the burning of wax is a chemical change. What is the essential difference between the physical change and chemical change of wax in a burning candle?

This is the weighted average of all of the isotopes of an element.

This is the number of protons.

This is a substance that cannot be broken down further by chemical means.

This is an element with a full valence shell, very unreactive.

This is a type of element that has many valence electrons, not a conductor.

Mr. Jacobs gives four groups of students an ice cube that they are to keep from melting as best as they can. An ice cube melts the LEAST over a period of one hour when it is

Pauline needs to measure the sliding friction of a brick. How should she go about doing this?

By what process does a lens focus light?

Which procedure is unsafe when heating a liquid in a test tube?

Soft drinks consist of a mixture of water, sugar, and flavoring, with carbon dioxide gas bubbled through it. Which of these ingredients would be considered the solvent?

What number should precede H₂ in the chemical equation below in order for the equation to be balanced? H₂ + N₂ → 2NH₃

As you move from left to right across a row of elements in the periodic table, what happens to the number of neutrons in a typical atom?

Which of the following could be used to convert light energy to electrical energy?

Use the table below to answer the following question. Tomal performed a flame test by burning a small amount of an unknown substance in the flame of a Bunsen burner. The flame turned blue. It is MOST likely that the unknown substance contained

Which of the following contains the MOST atoms?

Which of the following are transferred or shared when two atoms react chemically?

The number of protons in a neutral atom is equal to the number of

Albert stirs a mug of hot chocolate with a metal spoon. What type of heat transfer is responsible for the spoon getting hot?

In order to determine the speed of an object, what measurements must be made?

A student connects three identical light bulbs in parallel to a dry cell as shown below. What happens when the student removes one of the light bulbs from its socket?

A block of aluminum will be used to determine the density of aluminum.

If the block measures 2 cm × 3 cm × 6 cm, what is its volume?

Aluminum oxide, Al₂O₃, is produced by combining Al³⁺ and O²⁻ particles. What type of compound has been formed?

Which of the following pairs are isotopes of the same element?

An inclined plane is used to move a heavy box from the ground into the bed of a truck. If 100 N of force is required to move the load up the ramp, how much work is done? Disregard any force of friction.

Four pairs of objects have the masses shown below. If the objects in each pair are the same distance apart, the gravitational force between the objects in which pair is greatest?

A balanced chemical reaction obeys the law of