Unit 2 review

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​Test
Review

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I earn a score of 90% or higher on the review.

To read and correctly answer questions about the material we covered in Unit 2.

Labelling

Label the parts of an atom.

Drag labels to their correct position on the image

nucleus

electron

shell

neutron

proton

Multiple Choice

What is the main difference that makes one atom of an element different from an atom of another element?

Each atom has a ______________

• different atomic mass

• different number of nuclei

• different number of neutrons

• different number of protons

Draw

Fill in the information from the periodic table for nitrogen. Determine the number of protons, electrons, and neutrons and draw a Bohr's model of it.

Labelling

Label each as mixture, molecule, compound, or element.

Drag labels to their correct position on the image

molecule

mixture

element

compound

Labelling

Fill in the missing element for each category.

Drag labels to their correct position on the image

carbon

nitrogen

hydrogen

oxygen

Labelling

Fill in the missing information.

Drag labels to their correct position on the image

3

28

18

19

15

59

Match

Match the term with the correct definition.

neutron

element

compound

atomic mass

• neutron

• element

• compound

• atomic mass

Match

Match each term with the correct definition.

• The chemical symbols that represent a compound

proton

molecule

atomic

chemical formula

• proton

• molecule

• atomic

• chemical formula

Match

Match each term with the correct definition.

chemical symbol

subscript

coefficient

electron

mixture

• chemical symbol

• subscript

• coefficient

• electron

• mixture

Labelling

Label each as either a P (physical change) or C (chemical change).

Drag labels to their correct position on the image

C

P

Labelling

Label each as either a P (physical change) or C (chemical change).

Drag labels to their correct position on the image

C

P

Multiple Select

Which of these are physical changes?

• Mixing salt and pepper

• A marshmallow toasted over a campfire

• A marshmallow is cut in half

Multiple Choice

Which of the following correctly describes the chemical equation 3H₂ + N₂ -----> 2NH₃

• Balanced - Both sides have 6 atoms of hydrogen and 2 atoms of nitrogen

• Balanced - Both sides have 3 atoms of hydrogen and 2 atoms of nitrogen

• Unbalanced - The left side has 5 atoms of hydrogen the right only has 3

• Unbalanced - the left side has 6 atoms of hydrogen but the right only has 2

Multiple Choice

Which of these is a balanced chemical equation?

• 2Mg + HCl --> MgCl₂ + H₂

• SO₂ + O₂ + 2H₂O --> 4H₂SO₄

• 2Fe₂O₃ + 3C

  --> 4Fe + 3CO₂

• H₂O --> H₂O + O₂

Multiple Choice

A chemical reaction is represented by a

• chemical symbol

• chemical formula

• chemical equation

Fill in the Blank

The number of atoms of Na in 12NaBr is ________ (type the number only)

Fill in the Blank

The number of atoms of Br in 12NaBr is ________ (type the number only)

Fill in the Blank

The number of atoms of S in SBr₂ is ________ (type the number only)

Fill in the Blank

The number of atoms of Br in SBr₂ is ________ (type the number only)

Fill in the Blank

The number of atoms of Cl in ClF is ________ (type the number only)

Fill in the Blank

The number of atoms of F in ClF is ________ (type the number only)