Quiz about Benchmark 1 7th Grade

Question 1

Count the carbon atoms in this molecule. Hint: The symbol for carbon is C. How many carbon atoms are there?

Accepted Answer

1

Answer

2

Answer

3

Answer

4

Question 2

Count the chlorine atoms in this molecule. Hint: The symbol for chlorine is Cl. How many chlorine atoms are there?

Accepted Answer

2

Answer

3

Answer

1

Answer

4

Question 3

Count the oxygen atoms in this molecule. Hint: The symbol for oxygen is O. How many oxygen atoms are there?

Accepted Answer

1

Answer

2

Answer

3

Answer

4

Question 4

Helium is a gas that is less dense than air. So, helium is often used to fill balloons to make them float. The chemical formula for helium is He. Complete the statement. Helium is ______________________.

Accepted Answer

an elementary substance

Answer

a compound

Answer

a mixture

Answer

a solution

Question 5

Sodium fluoride is used in toothpaste to help prevent cavities. The chemical formula for sodium fluoride is NaF. Complete the statement. Sodium fluoride is ______________________.

Accepted Answer

a compound

Answer

an elementary substance

Answer

a mixture

Answer

a solution

Question 6

Different substances can have one or more chemical elements in common. So, the chemical formulas and models of these substances may look similar. Which model represents the substance with the chemical formula RbBr?

Accepted Answer

rubidium bromide

Answer

silver bromide

Answer

rubidium chloride

Question 7

Every substance can be represented by a chemical formula. The chemical formula tells you which chemical elements the substance is made of. In a chemical formula, each chemical element is represented by its atomic symbol. The models below represent molecules of three different substances. Each substance has a different chemical formula. Select the model that represents a molecule of the substance with the chemical formula ICl.

Accepted Answer

iodine monochloride

Answer

hydrogen sulfide

Answer

bromine

Question 8

What do these two changes have in common? mixing lettuce and salad dressing rain forming in a cloud

Accepted Answer

Both are only physical changes.

Answer

Both are chemical changes.

Answer

Both are caused by heating.

Answer

Both are caused by cooling.

Question 9

What do these two changes have in common? rust forming on a bicycle frame burning food on a stove

Accepted Answer

Both are chemical changes.

Answer

Both are only physical changes.

Answer

Both are caused by heating.

Answer

Both are caused by cooling.

Question 10

What do these two changes have in common? sanding a piece of wood ice melting in a cup

Accepted Answer

Both are only physical changes.

Answer

Both are chemical changes.

Answer

Both are caused by heating.

Answer

Both are caused by cooling.

Question 11

What do these two changes have in common? - chicken cooking in an oven - cellular respiration

Accepted Answer

Both are chemical changes.

Answer

Both are only physical changes.

Answer

Both are caused by heating.

Answer

Both are caused by cooling.

Question 12

Once it dries, concrete is stronger and more durable than many other building materials. It is resistant to wind, water, and temperature extremes. Buildings made of concrete provide better fire resistance than those made of wood. Concrete buildings also offer excellent energy efficiency.

Today, concrete is the most widely used synthetic material on Earth. Concrete has created structures like the Hoover Dam, the Burj Khalifa, and the Sydney Opera House. It is used to build homes, commercial buildings, roads, bridges, and sidewalks. Why is concrete a widely used building material? Select all that apply.

Accepted Answer

Compared to other building materials, concrete is stronger and more durable.

Accepted Answer

Concrete can be poured into molds, so it can form different types of structures.

Accepted Answer

Concrete is resistant to weather and temperature extremes.

Answer

Wood buildings have greater fire resistance than concrete buildings.

Question 13

Complete the sentences. Using the following information: Once cement has been made, it is mixed with water, crushed rocks, and sand. This forms a concrete slurry, a thick semi-liquid mixture with solids suspended in water. The concrete slurry is transported to a job site by a concrete mixer. At the job site, the slurry is poured into molds. As the wet concrete hardens, it gains strength.

A slurry of ___ concrete can be poured into molds. Over time, the concrete gets ______.

Accepted Answer

wet ... stronger

Answer

dry ... weaker

Answer

liquid ... solid

Answer

soft ... hard

Question 14

Many people use plastic every day. Plastic bags, like most other plastics, are made from fossil fuels like petroleum and natural gas. Fossil fuels formed millions of years ago, when ancient plants and animals decomposed deep under Earth's surface. In order to make plastic bags, petroleum must be extracted from under Earth's surface. Petroleum and natural gas have a mixture of carbon-based molecules. These molecules are isolated using high heat. Then, specific molecules can be used to make plastics. Which natural resources are used to make plastic bags? Select all that apply.

Accepted Answer

petroleum

Accepted Answer

natural gas

Answer

wood

Answer

water

Benchmark 1 7th Grade

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