Final of Chemistry

What is the correct answer for the following calculation 28.58/16X8.02

0.22

Which of the following measurements has three sig figs

0.510 m

What is the answer with the correct number of sig figs 4.902g+102.30g+2.10g

109.30g

How many centimeters are in 57.0 inches

145 cm

Elements in group 2A(2) of the periodic table form ions with the charge of

2-

What is 6.5 converted to inches? (1 m=100 cm; 1 inch= 2.54 cm)

260 inches

Silicon has three naturally occurring isotopes: Si-28 (27.977 amu) with an abundance of 92.23%, Si-29 (28.976 amu) with the abundance of 4.68% and Si-30 (29.974 amu) with the abundance of 3.09%. What is the atomic mass of silicon?

28.085 amu

What is the mass number of an atom of potassium that has 20 neutrons

39

A measurement of 0.0000043 m, expressed in scientific notation would look like

4.3X 10^-7

A calculator answer of 423.6059 must be rounded to 3 sig figs. What answer is reported?

424

1.00 pint of milk has a volume of how many milliliters? (2 pints=1 quart; 1 quart= 946 mL

473 mL

Which element would have physical and chemical properties similar to chlorine

Bromine

An ionic compound

Has a net charge of zero

In ionic compounds,___________ lose their valence electrons to form ___________.

Metals, cations

The octet rule indicates that

Noble gases react with other compounds to get eight valence electrons

The number of dots in the electron dot symbol for sulfur (S) is

Six

Isotopes are atoms of the same element that have

The same atomic number but different numbers of neutrons

Which of the following is not a chemical

carbon dioxide

The atomic size of atoms

decreases going across a period

An anion always

has a negative charge

Which of the following is a unit of measurement of mass in the metric system

kilogram

How many electrons will aluminum lose or gain when it forms an ion

lose 3

The compound Mg(NO3)2 is named

magnesium nitrate

Which substance can be classified as a chemical

salt

A value of 25 degrees C is a measurement of what

temperature

The amount of space occupied by a substance is its

volume