The image shows an atom arrangement. Why is it considered a mixture?

It is a physical combination of two or more different substances.

It is composed of one kind of atom.

It is composed of extremely small particles.

It is composed of two or more types of elements that are chemically combined.

Ammonia is made up of two pure substances: nitrogen and hydrogen. What can be true for ammonia, nitrogen and hydrogen?

Ammonia is a compound, and nitrogen and hydrogen are elements.

Ammonia is a mixture, and nitrogen and hydrogen are elements.

Ammonia is a mixture, and nitrogen and hydrogen are compounds.

Ammonia is an element, and nitrogen and hydrogen are compounds.

When chemical W is added to a liquid, the chemical breaks down into substances X, Y and Z into simpler substances. It is not possible to break down substances X, Y and Z into simpler substances. What conclusion is supported by this evidence?

Substances X, Y and Z are elements.

Chemical W is a pure substance.

Substances X, Y and Z are compounds.

A student adds 50 g of sugar to two test tubes, 1 and 2. The student adds 50 mL of water in Test Tube 1 and 50 mL of sulfuric acid in Test Tube 2. The diagram shows the observations.

Test tube 1 is a physical change and test tube 2 is a chemical change.

Test tube 1 is a chemical change and test tube 2 is a physical change.

Both test tubes are physical changes.

Both test tubes are chemical changes.

Which statement describes a chemical change?

When baking soda is mixed with vinegar, bubbles are formed.

When a beaker of water is heated, bubbles rise to the surface of the liquid.

When a piece of wax is heated, it becomes a liquid.

When sugar is placed in a beaker of water, the sugar dissolves.

How does a chemical equation support the law of conservation of matter?

Both sides must have the same atoms and the same number of atoms.

The left must be greater than the right.

The right must be greater than the left.

Both sides must have the same number of atoms.

How is the Law of Conservation of Matter best represented in a chemical reaction?

The mass of the reactants is equivalent to the mass of the products.

The mass of the products is greater than the mass of the reactants.

The mass of the reactant is greater than the mass of the products.

The mass of the reactants has no relationship to the mass of the products.

What is the significance of a column in the periodic table?

A column, better known as a group, includes elements with similar properties.

A column, better known as a period, includes elements with similar properties.

A column, better known as a group, includes elements with the same number of electrons.

A column, better known as a period, includes elements with the same number of electrons.

How are the elements organized in the periodic table?

Elements are ordered by atomic number.

Elements are ordered by atomic weight.

Elements are arranged alphabetically.

What statement about the periodic table is true?

Elements in the same columns have similar properties.

Elements in the same row share similar properties.

Elements on the left have a larger nucleus than elements on the right.

Elements at the top of each column have the highest atomic mass in that column.

What statement best describes the Law of Conservation of Mass?

Matter can be neither created nor destroyed in a chemical reaction.

Matter can be created but not destroyed in a chemical reaction.

Matter can be destroyed but not created in a chemical reaction.

Matter can be created and destroyed in a chemical reaction.

Which chemical equation supports the Law of Conservation of Matter?

2H 2 + O 2 $$\rightarrow$$ 2H 2 O

2H + O 2 $$\longrightarrow$$ 2H 2 O

H 2 + O 2 $$\longrightarrow$$ H 2 O

H 2 + O 2 $$\rightarrow$$ 2H 2 O

Chemistry Unit Assessment

8th Grade

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32 Qs

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Chemistry Unit Assessment

Quiz

•

Chemistry

•

8th Grade

•

Practice Problem

•

Medium

•

NGSS

MS-PS1-1, MS-PS1-2, MS-PS1-5

Standards-aligned

Debra Gallagher

Used 257+ times

FREE Resource

32 questions

Show all answers

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

Referencing the periodic table, what do the elements fluorine, chlorine, and bromine have in common?

All are located in the same period.

All have metallic properties.

All are halogens, so they are not very chemically active.

All have the same number of valance electrons.

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

What does X represent?

atomic mass

atomic number

name of the element

number of valence electrons

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

What does Y represent?

atomic mass

atomic number

name of the element

number of valence electrons

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

What does Z represent?

atomic mass

atomic number

name of the element

number of valence electrons

Tags

NGSS.HS-PS1-1

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

Which diagram represents a mixture?

the first (top) one

the second one

the third one

the fourth (bottom) one

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

Which statement is true about the organization of matter?

Atoms can be broken down into particles called elements and compounds.

Atoms make up elements the can chemically combine to form compounds.

Compounds are composed of elements that chemically combine to form atoms.

Elements are composed of compounds that chemically combine to form atoms.

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

30 sec • 5 pts

Which statement describes a chemical property?

Steel is shaped into automobile fenders.

Water begins to boil when it reaches 100° C.

Oil floats on water because it is less dense.

Iron slowly forms rust when exposed to oxygen gas.

Tags

NGSS.MS-PS1-2

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Chemistry Unit Assessment

32 questions

Referencing the periodic table, what do the elements fluorine, chlorine, and bromine have in common?

What does X represent?

What does Y represent?

What does Z represent?

Which diagram represents a mixture?

Which statement is true about the organization of matter?

Which statement describes a chemical property?

Which example shows a change in state of matter?

A substance changed from one state of matter to another. The image shows its particle motion in the first state and the second state. How is the transition between State 1 and State 2 best described?

The image shows an atom arrangement. Why is it considered a mixture?

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