Chemistry Quiz

A hypothesis is a _____.

• well-tested unifying principle that explains a body of facts

• set of quantitative data

• tentative explanation or predication based upon experimental observations

• set of experiments designed to test a theory

• concise statement of behavior that is always the same under the same conditions.

Tags

NGSS.HS-LS1-6

NGSS.HS-PS1-2

Balancing chemical equations is an application of which law?

• The law of conservation of matter

• The law of conservation of energy

• The law of multiple proportions

• The law of conservation of matter and energy

• The conversion of a hypothesis to a law

Tags

NGSS.HS-PS1-7

Atoms are made of three subatomic particles. What are these particles and their charges?

• Proton (+1), neutron (0), and electron (−1)

• Proton (−1), neutron (+1), and electron (0)

• Proton (+1), neutron (−1), and electron (0)

• Proton (0), neutron (+1), and electron (−1)

• Proton (−1), neutron (0), and electron (+1)

Which of the following elements belong to the halogens?

• Sodium

• Magnesium

• Nitrogen

• Chlorine

• Neon

The reaction of chlorine molecule with potassium iodide yields iodine molecule and potassium chloride. Write a balanced chemical equation for this reaction.

• Cl2(g) + KI(s) → I(s) + KCl2(s)

• Cl2(g) + 2 KI(s) → I2(s) + 2 KCl(s)

• Cl2(g) + KI2(s) → I2(s) + KCl2(s)

• Cl(g) + KI(s) → I(s) + KCl(s)

• Cl2(g) + 2 K2I(s) → I2(s) + 2 K2Cl(s)

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The thermochemical equation for the combustion of butane is given below. C₄H₁₀(g) + 13/2 O₂(g) → 4 CO₂(g) + 5 H₂O(ℓ) ΔH° = −2877 kJ/mol-rxn What is the enthalpy change for the reaction below? 4 CO₂(g) + 5 H₂O(ℓ) → C₄H₁₀(g) + 13/2 O₂(g)

• +1439 kJ/mol-rxn

• +2877 kJ/mol-rxn

• −5754 kJ/mol-rxn

• −2877 kJ/mol-rxn

• +5754 kJ/mol-rxn

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

How many s orbitals are in the n = 3 shell?

• 0

• 6

• 5

• 3

• 1

Boron, carbon, nitrogen, oxygen and fluorine are in the same period of the periodic table. Which of the following bonds is most polar?

• B-H

• C-H

• N-H

• O-H

• F-H

Which of the following molecules is polar?

• CS₂

• SO₂

• XeF₂

• XeF₄

• SO₃

Electronegativity is a measure of _____.

• atomic size

• ionization energy

• electron affinity

• the ability of an atom to attract electrons

• nuclear charge

Tags

NGSS.HS-PS1-2