Grade 10 Chemistry Baseline Test

If the solubility of a gas in water at 25°C is 22.25 mg/L at 2.5 atm of pressure, what is its solubility (in mg/L) at 25°C and 1.0 atm of pressure?

• 0.11 mg/L

• 8.9 mg/L

• 25 mg/L

• 56 mg/L

Compounds with which type of bond have the potential to dissociate in water?

• ionic bond

• metallic bond

• covalent network bond

• non-polar covalent bond

Which of the following will decrease the pressure of a gas in a closed container?

• increasing the number of molecules

• increasing the amount of light

• increasing the temperature

• increasing the volume

Water has a number of unique properties. Which situations occur due to the fact that ice is less dense than liquid water?

• rain falls as droplets

• icebergs float on water

• water is used for cleaning

• fish can survive in partially frozen lakes rocks can skip across water.

Tags

NGSS.HS-ESS2-5

Calcium bromide is the product of calcium and bromide ions. What is the formula for calcium bromide?

• CaBr

• CbaBr2

• Ca2Br

• CaBr2

How many atoms are found in a 15.5 g sample of bismuth?

• 9.33 × 1024 atoms

• 3.24 × 103 atoms

• 1.26 × 1022 atoms

• 4.46 × 1022 atoms

Tags

NGSS.HS-PS1-7

What is the name of the chemical with the formula SF6?

• sulfur (VI) fluoride

• sulfur hexafluoride

• sulfur heptafluoride

• sulfur (6) fluoride

Which of the following shows a prefix used in naming molecular compounds with 9 atoms?

• deca-

• nona-

• hexa-,

• octa-,

Which of the following substances is less soluble in hot water than in cold water?

• NaCl (s)

• O2(g)

• NaNO3(s)

• KBr(s)

What is the molar volume of a gas at STP?

• 1.0 atm/mol

• 22.4 L/mol

• 1.0 L/22.4 mol

• 22.4 atm/mol