Chemistry Test 1

the average distance from Earth to the Sun is 150 megameters. what is the distance in meters?

1.5x10^8m

which of the following correctly expresses 52,030.2m in scientific notation?

5.20302x10^4m

the mass of a sample is 550 milligrams. which of the following expresses that mass in kilograms?

5.5x10^-4kg

calculate the mass percent of oxygen in kaolinite

55.81 mass%

what is the formula of chlorine dioxide?

ClO2

what is the formula for lithium nitrite?

LiNO2

what is the formula for magnesium sulfide?

MgS

a large pizza has a diameter of 15 inches. Express this diameter in centimeters

38cm

calculate the molecular mass for ammonium sulfate (NH4)2SO4

132.13amu

given that 1 inch = 2.54cm, 1cm^3 is equal to

.0610 in^3

The speed needed to escape the pull of Earth's gravity is 11.3 km/s. What is this speed in mi/h?

25,300 mi/hr

Isotope Bromine -81 select the combination which lists the correct atomic number, neutron number, and mass number, respectively

35, 46, 81

which of the following correctly expresses .000007913g in scientific notation?

7.913x10^-6g

what is the formula for barium sulfate?

BaSO4

what is the chemical formula of diiodine pentaoxide?

I2O5

After an atom has lost an electron it becomes a/an ______ and has a _______ charge.

cation, positive

what is the name of CoCl2

cobalt (II) chloride

S Ge Hg H I Si

nonmetal mettaloid metal nonmetal nonmetal metalloid

which one of the following combinations of names and formulas of ions is incorrect?

oxide

what is the name of PCL3

phosphorus trichloride

what is the name of P4S10

tetraphosphorus decasulfide

what is the name of P4Se3

tetraphosphorus triselenide

the chmeical symbol of potassium is

K

which of the following gives the formula and the bonding for sodium oxide?

Na2O, ionic compound

what is the formula for lead (II) oxide?

PbO

Atoms X, Y, Z, and R have the following nuclear compositions: Which two are isotopes?

X & Z

what is the formula of tetrasulfur dinitride?

S4N2

what is the chemical symbol for the group 6A(16) element that lies in Period 4?

Se

what is the name of (NH4)2S

ammonium sulfide

when an atom is represented by the symbol, the value of A is the

atomic mass of the element

what is the name of BBR3

boron tribromide

what is the name of the acid formed when HBr gas is dissolved in water?

hydrobromic acid

which of the following is a metal?

thallium, TI, Z=81