Chemistry

Matter

100

A combination of sand, salt, and water is an example of a 

a. heterogeneous mixture

b. solid

c. compound

d. homogeneous mixture

e. pure substance

heterogeneous mixture 

200

which one of the following is an extensive property? 

a. boiling point

b. mass

c. melting point

d. density

mass

300

define physical property and chemical property

Physical property: can be observed without changing the identity

Physical property: can be observed without changing the identity

400

which one of the following is the highest temperature? 

a. 302K

b. 38C

c. 98 F

d. all of them is the same

38C

500

The density of a gold nugget is 19.3g/cm3. If the volume of the gold nugget is 0.00369 L, the mass of the nugget is ___g.

71.2g

Atoms, Moles, and Compound

100

Which pair of elements would you expect to exhibit the greatest similarity in their physical and chemical properties?

a. Cs, Ba

b. Ga, Ge

c. H, Li

d. C, O

e. Ca, Sr

Ca, Sr

200

What is the formula for the compound Copper (I) chloride?

CuCl

300

Which of the following is a symbol for unit that is not a direct measurement. 

a. s

b. g

c. cm³

d. mol

cm³

400

There are ___ protons, ____ neutrons, and ____electrons in ²³⁸U⁺⁵.

92, 146, 87

500

How many molecules of CH₄ are in 48.2 g of this compound?

1.81*10²⁴

Reaction and Stoichiometry

100

What is the charge on the manganese in the compound MnCO_3?

+2

200

HBr, HCl, HClO₄, KBr, and NaCl are all classified as 

a. weak electrolytes

b. acids

c. nonelectrolytes

d. strong electrolytes. 

Strong electrolytes

300

What volume (ml) of a concentrated solution of sodium hydroxide (6.00M) must be diluted to 200ml to make a 0.880M solution of sodium hydroxide.

29.3

400

In every balanced chemical equation, each side of the equation is the same number of

a. coefficients

b. moles

c. atoms

d. molecules

atoms

500

Under appropriate conditions, nitrogen and hydrogen undergo a combination reaction to yield ammonia: 

N₂ (g) + 3H₂ (g) --> 2NH₃ (g)

A ___ g sample of N₂ requires 3.0g of H₂ for complete reaction. 

14g

Heat, Gases, and Electrons

100

Which of the following is an exothermic process? 

a. water evaporating

b. ice melting

c. boiling soup

d. condensation of water vapor

e. ammonium thiocyanate and barium hydroxide are mixed at 25C, the temperature drops

Condensation of water vapor

200

The value of ΔH for the reaction below is -790KJ. The enthalpy change accompanying the reaction of 0.95 g of S is ___ KJ. 

2S (s) +3O₂ (g) --> 2SO₃ (g)

a. -790

b. -23

c. 23

d. -12

e. 12

-12KJ

300

A sample of iron absorbs 81.0 J of heat, upon which the temperature of the sample increases from 19.7C to 28.2C. If the specific heat of the iron is 0.450J/gK, what is the mass (in grams) of the sample> 

a. 4.29g

b. -21.2g

c. 0.0472g

d. 3.83g

e. 21.2g

21.2g

400

Na reacts with element X to form an ionic compound with the formula Na₃X. Ca will react with X to form ___? 

a. Ca₂X₃

b. Ca₃X₂

c. CaX₂

d. CaX

e. Ca₃X

Ca₃X₂

500

Which of the following is not a valid set of four quantum numbers? (n, l, m_l, m_s)

a. 3, 1, -1, -1/2

b. 1, 1, 0, +1/2

c. 2, 0, 0, +1/2

d. 1, 0, 0, +1/2

e. 2, 1, 0, -1/2

1, 1, 0, +1/2

Bonding, shapes, and Forces

100

Which is the longest bond? 

a. C=C

b. C-C

c. C-H

d. C ≡ C 

 C-C

200

What is the hybridization of the central atom in SO₂?

a. sp

b. sp²

c. sp³​

d. sp³d

​​​

sp²

300

What is the molecular geometry of NH₃ (ammonia)?

a. Trigonal planar
b. Trigonal pyramidal
c. Tetrahedral
d. Bent

trigonal pyramidal

400

What is the bond angle in a carbon dioxide (CO₂) molecule?

a. 90°
b. 104.5°
c. 120°
d. 180°

180, linear

500

What is the formal charge on the nitrogen atom in the ammonium ion (NH₄⁺)?

a. 0
b. +1
c. -1
d. +2

+1