The diagram shows the formation of water from hydrogen and oxygen. Which statement is true?

The reaction satisfies the Law of Conservation of Matter because the number of each type of atom is the same in the products and reactants.

The reaction satisfies the Law of Conservation of Matter because only one type of substance is formed as a product.

The reaction does not satisfy the Law of Conservation of Matter because the atoms are in different arrangements in the products and reactants.

The reaction does not satisfy the Law of Conservation of Matter because the new substance formed is made up of two types of atoms.

Study chemical equations 1 and 2. Which statement is true about the two reactions shown?

Reaction 2 satisfies the Law of Conservation of Matter, but reaction 1 does not.

Both reactions satisfy the Law of Conservation of Matter.

Both reactions do not satisfy the Law of Conservation of Matter.

Reaction 1 satisfies the Law of Conservation of Matter, but reaction 2 does not.

The box shows the formula for a common substance. Which statement is true about the substance?

It is composed of 2 atoms of hydrogen and 1 atom of oxygen.

It is composed of 3 different elements.

It is composed of 2 atoms of oxygen and 1 atom of hydrogen.

It is composed of 3 different compounds.

Which equation is balanced to obey the Law of Conservation of Matter during the reaction?

CH₄ + 2O₂ → 2CO₂ + H₂O

The table shows the reactants and products of a chemical reaction. Which chemical equation represents the reaction?

CH₄ + 4Cl₂ → CCl₄ + 4HCl

CCl₄ + 4HCl → CH₄ + 4Cl₂

CH₄ + CCl₄ → 4Cl₂ + 4HCl

CCl₄ + 4Cl₂ → CH₄ + 4HCl

When coal burns, the reaction

releases heat and is exothermic

releases heat and is endothermic

absorbs heat and is endothermic

Synthetic gas, a combination of carbon monoxide, hydrogen, and carbon dioxide, is produced by treating coal with steam and oxygen at a high temperature. This mixture can be used as a combustion fuel instead of methane or natural gas. How does synthetic gas differ from natural gas?

Natural gas is used as it is obtained from Earth, but synthetic gas is made by chemical modification of a natural product.

Natural gas is a better fuel because it occurs inside Earth, but synthetic gas is manufactured by people.

Natural gas is used without modification, but synthetic gas must be mixed with oxygen before it can be burned.

Natural gas is a limited natural resource, but synthetic gas is manufactured so it does not deplete a natural resource.

People make clothing using fibers that come from natural materials and from synthetic materials. How do these materials differ from one another?

Natural fibers are produced from materials made by plants or animals while synthetic fibers are produced by chemical changes to raw materials.

Natural fibers form threads that are woven to form cloth while synthetic fibers are linked together chemically to form cloth.

Natural fibers and synthetic fibers both come from plant sources but synthetic fibers are modified chemically to become stronger.

Natural fibers are not colored with dye but synthetic fibers are dyed many colors.

Synthetic fibers, such as nylon and rayon, have replaced a natural fiber, silk, for many uses. Which of these is most likely one of the reasons for this replacement?

Natural fibers have more limited availability than synthetic fibers.

Natural fibers make a cloth that cannot be cut into shapes as easily as synthetic fibers.

Synthetic fibers do not require using natural resources.

Synthetic fibers can be woven into cloth at a faster rate.

Unit 1 Matter Common Assessment

Authored by Siobhan Keefe

Science

7th Grade

NGSS covered

Used 2+ times

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25 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the 2 called in the product of the balanced equation below? H₂ + Cl₂ = 2HCl

subscript

coefficient

atomic number

atomic mass

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which chemical equation supports the law of conservation of matter?

H₂O₂ → H₂O + O₂

2 Fe₂O₃ + 3 C → 4 Fe + 3 CO₃

SO₄ + O₂ + 2 H₂O → 4 H₂SO₄

Mg + 2 HCl → MgCl₂ + H₂

Tags

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which chemical equation shows a chemical reaction where mass is conserved?

FeS + HCl → FeCl₂ + H₂S

2Cu₂O + C → 4Cu + CO₂

Fe₂O₃ + C → Fe + CO₂

Fe + H₂SO₄ → FeSO₄ + 2H₂

Tags

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

There are many gases in our atmosphere. Which gas is made by combining two different elements?

oxygen

nitrogen

methane

helium

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which example is a physical change?

burning paper

boiling water

rotting vegetables

rusting iron fence

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which activity is a chemical change for metal wire?

bending a piece of metal wire

coiling of a piece of metal wire

rusting of a piece of metal wire

cutting a piece of metal wire

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

During an experiment, a student placed a cube of solid baking soda in a glass dish. He added 10 drops of vinegar to the baking soda and recorded his observations.
1. Bubbles formed.
2. The dish became slightly colder.
3. The shape of the cube changed.
What type of change happened in the glass dish, and why?

a physical change as bubbles were formed

a physical change as the temperature decreased

a chemical change as the shape of the cube changed

a chemical change as the temperature changed and a gas was released

Tags

NGSS.MS-PS1-2

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Unit 1 Matter Common Assessment

What is the 2 called in the product of the balanced equation below? H₂ + Cl₂ = 2HCl

Which chemical equation supports the law of conservation of matter?

Which chemical equation shows a chemical reaction where mass is conserved?

There are many gases in our atmosphere. Which gas is made by combining two different elements?

Which example is a physical change?

Which activity is a chemical change for metal wire?

Examine the chemical equation. Which substance(s) is (are) broken apart?

A student mixes 8 grams of chemical A with 6 grams of mixture B in a closed container. The chemicals react completely, and the products are formed. According to the Law of Conservation of Mass, what should be the mass of the products formed?

Which equation demonstrates the Law of Conservation of Matter during the formation of water?

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