Chem- Quizzes

Which of the following are chemical processes? 1. rusting of a nail 2. freezing of water 3.decomposition of water into hydrogen and oxygen gas 4. compression of oxygen gas A) 1, 3 B ) 2 , 3, 4 C ) 1 , 3, 4 D ) 1 , 4 E ) 1, 2

1&3

The correct answer (reported to the proper number of significant figures) to the following is ________. (12.67 + 19.2)(3.99) / (1.36 + 11.366) = ________ A) 9.9985 B) 1.00 × 101 C) 9.999 D) 9.99851 E) none of the above

1.00 x 101

1.55 kg/m3 is equivalent to ________ g/L. A) 1.55 × 10-3 B) 1.55 × 103 C) 1.55 × 106 D) 1.55 E) 1.55 × 10-6

1.55

Express the temperature, 275.18 K, in degrees Celsius. A) 274.17 °C B) 548.33 °C C) 2.03 °C D) 120.88 °C E) 22.78 °C

2.03 degrees celsius

The element X has three naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given in the table below. The average atomic mass of the element is ________ amu. Isotope Abundance Mass 221X 55.700 220.90 220X 38.800 220.00 218X 5.5000 218.10 A) 219.00 B) 220.40 C) 33.333 D) 219.67 E) 220.24

220.40

Which of the following has the same number of significant figures as the number 0.0050? A) 4.0 B) 601 C) 99.000 D) 1.00 E) 0.9

4.0

There are ________ protons, ________ electrons, and ________ neutrons in an atom of 129 54Xe. A) 54, 75, 129 B) 54, 54, 129 C) 129, 129, 75 D) 129, 129, 129 E) 54, 54, 75

54,54,75

The element calcium is in a group known as the ________. A) alkaline earth metals B) halogens C) alkali metals D) transition metals E) noble gases

alkaline earth metals

An element cannot ________. A) be part of a heterogeneous mixture B) be part of a homogeneous mixture C) interact with other elements to form compounds D) be separated into other substances by chemical means E) be a pure substance

be separated into other substances by chemical means

A separation process that depends on differing abilities of substances to form gases is called ________. A) distillation B) chromatography C) filtration D) solvation E) All of the above are correct

distillation

A combination of sand, salt, and water is an example of a ________. A) heterogeneous mixture B) homogeneous mixture C) compound D) solid E) pure substance

heterogeneous mixture

________ is the abbreviation for the prefix milli-. A) n B) d C) M D) m E) k

m

Which one of the following is not an intensive property? A) density B) temperature C) mass D) melting point E) boiling point

mass

Which of the following is an illustration of the law of constant composition? A) Water boils at 100 °C at 1 atm pressure. B)Water can be separated into other substances by a chemical process. C) Water is a compound. D) Water is 11% hydrogen and 89% oxygen by mass. E) Water and salt have different boiling points.

water is 11% hydrogen and 89% oxygen by mass

Of the three types of radioactivity characterized by Rutherford, which type does not become deflected by a electric field? A) α-rays B) γ-rays C) α-rays, β-rays, and γ-rays D) α-rays and β-rays E) β-rays

y-rays

The charge on the silver ion in the salt AgCl is ________. A) +1 B) +2 C) +4 D) +3 E) +5

+1

An object measuring 77 milliliters will have a volume of ________ liters. A) 770 B) 0.077 C) 7700 D) 77000 E) 13

0.077