Unit 1 Review

Vocabulary

100

What is the smallest particle of an element; made of electrons, protons, and neutrons?

ATOM

200

What is a pure substance composed of the same type of atom throughout?

ELEMENT

300

What is the small number written at the bottom of the symbol, represents the atomic number

SUBSCRIPT

400

What is a new substance with unique chemical and physical properties formed when two or more elements are chemically bonded during a chemical reaction?

COMPOUND

500

What is a shorthand notation that uses chemical symbols and numbers as subscripts to represent the type and number of atoms that are present in the smallest unit of a substance?

CHEMICAL FORMULA

Atoms

100

Which of the following represents a single atom?

A) Mn
B) 5K
C) I
D) K₇O
E) H₃

A & C

200

How many atoms are in the chemical formula H₂CO₃?

Hydrogen - 2
Carbon - 1
Oxygen - 3
TOTAL = 6 ATOMS

300

What is the ratio of Sulfur to Magnesium in the chemical formula S₆Mg₆?

For every 1 ATOM OF SULFUR, there is 1 ATOM OF MAGNESIUM

400

The chemical formula for Sulfuric Acid is H₂SO₄. Which of the following statements is true about Sulfuric Acid?

A) There are 6 total atoms
B) There are 4 Sulfur atoms and 2 Hydrogen atoms
C) There are 2 Hydrogen atoms for every Sulfur atom
D) There are more Sulfur atoms than there are Hydrogen atoms 

C) There are 2 Hydrogen atoms for every Sulfur atom.

500

The chemical formula for phosphoric acid is H₂PO₄. Which of the following statements accurately describes the atoms involved? Select two answers.

A) There are 4 Phosphorus atoms
B) There is a ratio of 2 Hydrogen atoms for every 1 Phosphorus atom
C) There are twice as man Phosphorus atoms as there are Hydrogen atoms
D) For every Hydrogen atom, there are two Oxygen atoms
E) There are six total atoms involved in the chemical formula

B&D

E&C

100

Which of the following is an element followed by a compound that contains that element?

A) Br --> BH₄
B) CO₈ --> C
C) KCl --> C
D) O --> H₂O

D) O --> H₂O

200

Xe₅ is an example of a -

A) chemical equation
B) chemical reaction
C) chemical symbol
D) chemical formula

D) chemical formula

300

In the chemical formula, Ri₃KLi_8, there are ___ different elements and ___ total atoms. 

3 ELEMENTS

12 ATOMS

400

How many elements are in the formula Pd₈Xe₇?

TWO

500

Classify the substances as elements or compounds:

H₂O

Li₆Ru₂V₃

CoNi

Sn₄

H₂O - COMPOUND

Li₆Ru₂V₃ - COMPOUND

CoNi - COMPOUND

Sn₄ - ELEMENT

E&C

100

Which of the following is an element?

A) As
B) SCl
C) WY
D) U₃N

A) As

200

Which of the following is an compound followed by an element that contains that element?

A) As --> CdAH₄
B) PO₈ --> Pd
C) KCl --> C
D) O --> H₂O

C) KCl --> C

300

In the chemical formula, Al₂₃RnCm₂U₈, there are ___ different elements and ___ total atoms.

4 ELEMENTS

34 ATOMS

400

How many elements are in the formula Cd₈Ti₇Bk₃?

3

500

Classify the following as elements or compounds:

CO₂n  

SbGa 

3F₃ 

Ag 

CO₂n  - COMPOUND

SbGa - COMPOUND

3F₃ - ELEMENT

Ag - ELEMENT

H2O

100

What is a small number written at the bottom of the symbol, and represents the atomic number?

SUBSCRIPT

200

True or False: Np contains 1 subscript?

FALSE

300

True or False: Cs₄ contains no subscripts?

FALSE

400

Calcium Carbonate, CaCO₃, is a chemical compound. How does the subscript affect the number of atoms in the formula?

A) Subscript is distributed to all element totals, so the total number of atoms in this molecule is 9
B) Subscript is distributed to to the C and O making the total number of atoms in this formula equal to 6
C) Subscript is only distributed to the O making the total number of atoms in this formula equal to 5
D) Subscripts only affect the formula if they are attached to parenthesis, so the total number of atoms in this formula is 3. 

C) Subscript is only distributed to the O making the total number of atoms in this formula equal to 5

500

What does the subscript represent?

THE NUMBER OF ATOMS FOR EACH ELEMENT