What number and types of atoms occur in the following formula unit? CaNe 2 0 3

1 calcium atom, 2 neon atoms, and 3 oxygen atoms

1 calcium atom, 2 nitrogen atoms, and 6 oxygen atoms

1 carbon atom, 1 nitrogen atom, and 3 oxygen atoms

1 carbon atom, 1 neon atom, and 6 oxygen atoms

A piece of limestone is dropped into an acid solution and carbon dioxide gas is released. What has happened?

only a physical change occurred.

the formation of an element occurred.

How are elements similar to those within the same group on the periodic table?

They have similar chemical properties

They have the same number of electrons.

They have the same number of protons.

They have the same atomic mass.

Structural differences between different chemicals can be represented in models of the particles. Which drawing BEST represents a compound?

A. [Image: Model with three circles, one dark in the center and two lighter on the sides]

B. [Image: Model with three identical dark circles in a row]

observing bubbling and fizzing after adding an acid to a white powdery substance in a test tube. Which of the following can be inferred?

The acid reacted with the powder and a new product was formed.

The acid boiled when added to the substance

A physical change produced a gas mixture.

A reaction occurred that produced heat.

Which of the following observations provides evidence of a physical change?

a bottle that was broken into many small pieces

Fireworks creating bright lights and sound

a cake that was baked from many ingredients

A beaker contains a sample of water with a mass of 250 grams. The water in the beaker is boiled and weighed again after it cools. The new mass of the water is 200 grams. In this example of the conservation of Mass in physical changes,

the mass of the water was 250 grams and the mass of the water vapor that escaped the beaker was 50 grams.

the mass is less after it cools because water has less mass as a gas.

the process of boiling destroyed 20 grams of the water and left 305 grams of water.

the heat energy created by boiling water makes up the rest of the mass.

The compound sulfuric acid H 2 SO 4 , is composed of:

2 atoms of hydrogen, 1 atom of sulfur, and 4 atoms of oxygen

2 atoms of hydrogen , 4 atoms of sulfur, and 4 atoms of oxygen

2 molecules of hydrogen and 1 molecule of sulfate

1 molecule of hydrogen and 2 molecules of sulfate

A group of students observed steam rising from a pot of water as it boiled. What happened to matter because of the physical change to the water?

Matter was conserved when it changed phases

New matter was created in the bubbles.

Old matter was destroyed as the water turned to gas.

The chemical composition of the matter changed.

When table salt (NaCl) is produced, which of the following BEST describes the actions of the sodium (Na) and chlorine (Cl) atoms?

Sodium and chlorine atoms bond chemically.

Sodium atoms replace chlorine atoms.

Sodium and chlorine atoms mix together.

Sodium atoms dissolve in chlorine atoms.

Which of the following is a property shared by all elements in Group 1 of the periodic table?

They are all gases at room temperature

Which of the following best describes a mixture?

substances that can be separated by physical means

A pure substance that cannot be broken down

A substance made of only one type of couppund

A substance made of only one type of atom

Which of the following is an example of a chemical change?

Iron rusting when exposed to air

Which statement best describes a compound?

A substance formed when two or more elements are chemically bonded

A substance made of only one type of atom

A mixture of two or more elements that can be separated physically

A solution of different substances

What does the Law of Conservation of Mass state about chemical reactions?

Mass is neither created nor destroyed in a reaction

Atoms change into energy during a reaction

Energy is created during a reaction

Mass is destroyed during a reaction

Which of the following best describes an element?

A substance that cannot be broken down into simpler substances by chemical means

A substance made of two or more types of atoms chemically bonded

A solution of metals and nonmetals

A mixture of different compounds

Practice Questions for unit 2 test

Authored by Carly Dooley

Science

8th Grade

NGSS covered

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Made up of two or more elements.

solute

compound

atom

molecule

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which choice best describes the properties of group 1 on the periodic table

they are nonreactive metals

they are highly reactive metals

they are metalloids

they are highly reactive nonmetals

MULTIPLE SELECT QUESTION

45 sec • 1 pt

Which of the following chemical equations is balanced

H₂ + O₂→ H₂O

3Al + Fe₃→ 3FeAl

2Mg + O₂ → 2MgO

Tags

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which type of matter can be separated by physical means?

atom

element

compound

mixture

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A balanced chemical equation represents

Law of Conservation of Energy

Law of Conservation of Mass

Law of Superposition

Law of Gravity

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

The circles in Box A represent pure substances that cannot be broken down into a simpler form. What are these substances?

elements

compounds

mixtures

solutions

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which observation would indicate that the material is a mixture?

The material has different colored crystals

The material does not dissolve completely in water.

The material does not melt when it is heated over a burner.

The material reacts with an acid solution to form bubbles of gas.

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Practice Questions for unit 2 test

Made up of two or more elements.

Which choice best describes the properties of group 1 on the periodic table

Which of the following chemical equations is balanced

Which type of matter can be separated by physical means?

A balanced chemical equation represents

The circles in Box A represent pure substances that cannot be broken down into a simpler form. What are these substances?

Which observation would indicate that the material is a mixture?

A student passes a magnet over a powder. some of the powder sticks to the magnet, while some does not. Which of these identifies the substance?

What number and types of atoms occur in the following formula unit? CaNe₂0₃

A piece of limestone is dropped into an acid solution and carbon dioxide gas is released. What has happened?

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Science

Practice Questions for unit 2 test

Made up of two or more elements.

Which choice best describes the properties of group 1 on the periodic table

Which of the following chemical equations is balanced

Which type of matter can be separated by physical means?

A balanced chemical equation represents

The circles in Box A represent pure substances that cannot be broken down into a simpler form. What are these substances?

Which observation would indicate that the material is a mixture?

A student passes a magnet over a powder. some of the powder sticks to the magnet, while some does not. Which of these identifies the substance?

What number and types of atoms occur in the following formula unit? CaNe203

A piece of limestone is dropped into an acid solution and carbon dioxide gas is released. What has happened?

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Science

What number and types of atoms occur in the following formula unit? CaNe₂0₃