GEN CHM 1 EXAM 1 Practice

Element, Compound, Mixture

100

What is saltwater considered?

Homogenous mixture

200

What is water considered?

A compound

300

What is pizza considered?

Heterogenous mixture

400

Name a homogenous mixture

Anything where components are distributed at a molecular level

500

Name a heterogenous mixture

Anything that's not fully distributed/bonded

Conversion with Sig Figs

100

9873.3 C -> K

1260.5 K

200

35 mols Mg -> atoms

2.1 x 10²⁵ atoms Mg

300

56x 10^3 cm -> km

0.56 km

400

469.88 x 10²⁷ K atoms -> mols

7.8020 x 10²⁵ mols K

500

849.5 mg-> lb

0.001873 lb

Naming

100

C₅N

pentacarbon mononitrogen

200

lithium phosphide

Li₃P

300

FeO

Iron (II) oxide

400

Beryllium nitrate

Be(NO₃)₂

500

ammonium sulfate

(NH4)₂SO₄

Atoms

100

Name the element. Protons= 6, Neutrons=6

Carbon

200

Identify the element. Neutrons= 7 Atomic Mass= 14

Nitrogen

300

Find the number of electrons of Si (+1)

13 electrons

400

Find the number of protons, electrons, neutrons, atomic mass, atomic number: Cl

Protons: 17

Neutrons: 17

Electrons: 17

Atomic mass: 34

Atomic Number: 17

500

Find the number of neutrons for the isotope of chromium-54

30 neutrons

Balancing

100

Name one rule for balancing

Answers may vary

200

H₂O₂ + H₂S -> H₂O + S

2 H₂O

300

C₃H₆O + O_2-> CO₂ + 3H₂O

4 O₂

3 CO₂

3 H₂O

400

C₅H₁₀O + O₂ -> CO₂ + H₂O

7O₂

5 CO₂

5 H₂O

500

Fe(OH)₃ + H₂SO₄ -> Fe₂(SO₄)₃ + H₂O

2 Fe(OH)₃

3 H₂SO₄

6H₂O