TEST 1

Which of the following correctly expresses 0.000007913 g in scientific notation?

D. 7.913 x 10^(-6) g

hich of the following does not contain ant non-metals?

A. C, S, As, H

Bromine is the only nonmetal, bromine-81, select the combination which lists the correct atomic number, mass number

35,46,81

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

A.38 cm

Select the best statement.

A.Physical changes may be reversed by changing the temperature

Which of the following symbols does not represent an element?

C. HF

Combustion of one mole of methane releases 802.3 kilojoules of energy. How much energy does that represent in kilocalories?

B. 1.92 x 10^(2) kcal

Your favorite candy bar, contains 1.2 x 10^(6) J of energy while your soft drink contains 6.7 x 10^(5) J. 2 Candy bars, 3 soda. What percent of your 2000 calorie daily food intake is left for veggies?

B. 47%

Express 96,342 m using 2 significant figures.

B. 9.6 x 10^(4) m

Which of the following is a non-metal?

B. Bromine, Br, Z= 35

When an atom is represented by a symbol A over Z X, The value of A is

B. Number of protons in the element

Acetone, which is used as a solvent and as a reactant in the manufacture of Plexiglas, boils at 56.1 degrees Celsius. What is the boiling point in degrees Fahrenheit?

B.133 degrees Fahrenheit

Select the answer that expresses the result of this calculation with the correct number of significant figures and with correct units. 16.18 cm x 9.6114 g / 1.4783 cm^2

C. 105.2 g/cm

A Snickers candy bar contains 280 calories, of which the fat content accounts for Calories. What is the energy of the fat content, in KJ?

C. 5.0 x 10^(2) KJ

Which of the following is a metalloid?

C. Germanium, Ge, Z = 32

Which of the following is a chemical change?

C.Broiling a steak on a grill

The S.I prefix mega-(M) means:

D.10^6

Which of the following is not an S.I based unit?

D.gram

Which of the following compounds is ionic?

E. MgCl2

Who is credited with discovering the atomic nucleus?

E. Rutherford

Atoms X,Y,Z & R. Which two are isotopes?

E. X & Z

A dose of medication was prescribed to be 35 microliters. Which of the following expresses that volume in centimeters?

E.3.5 x 10^(-3) cL