Chemistry Quiz

What is the pH of a 0.027 M KOH solution?

• 1.24

• 1.57

• 6.47

• 14.11

Standard pressure is exactly

• 760 mm atm

• 1 atm

• 101 atm

• 760.325 atm

The mass of a sample containing 3.5 mol of silicon is approximately

• 72 g

• 98 g

• 35 g

• 28 g

A prospector finds 39.99 g of pure gold. She has..

• 6.022x10^23 atoms of Au

• 1.204x10^23 atoms of Au

• 4.306x10^23 atoms of Au

• 2.308x10^23 atoms of Au

6.022 x 10^23 atoms of Au.

• 1.204 x 10^23 atoms of Au.

• 3.108 x 10^23 atoms of Au.

• 4.306 x 10^23 atoms of Au.

Which of the following is a formula equation for the formation of carbon dioxide from carbon and oxygen?

• 2C + O -> CO

• C + O2 -> CO

• C + O -> CO2

Which stoichiometry conversion factor can be calculated by adding up the masses of all atoms in a substance's chemical formula?

• atomic mass

• Avogadro's number

• mole ratio

In a particle diagram of the equation Pb(NO3)2(aq) + 2KI(aq) -> PbI2(s) + 2KNO3(aq), the only compound that is NOT separated into its individual ions is:

• KNO3

• PbI2

• Pb(NO3)2

• KI

The pressure of a sample of gas at 10.0°C increases from 700. mm Hg to 900. mm Hg. What is the new temperature?

• 364°C

• 0°C

• 90.9°C

• 39.0°C

What is the molar mass of Ca(NO3)2? SHOW WORK

• 132.10 g/mol

• 86.09 amu

• 86.09 g/mol

• 132.10 amu