Review Day I

Calculate the density of a bar of Gold that has mass 125 g and has volume of 50 cm³. ( density = mass/ volume)

• 6250 g/cm³

• 125 g/cm³

• 2.5 g/cm³

• 0.4 g/cm³

Calculate the density of a cube that has mass 25 g and each side of it measures 2 cm.

• 0.32 g/cm³

• 200 g/cm³

• 3.125 g/cm³

• 2.30 g/cm³

pH of a substance A is 12.5, Substance A is a __________

• Strong Acid

• Strong Base

• Salt

• Liquid

What is the mass of one mole ( MOLAR MASS ) of Cobalt?

• 103 g.mol

• 27 g/mol

• 59 g/mol

• 190 g/mol

What is the mass of one mole ( MOLAR MASS ) of Boron?

• 5 g/mol

• 10.8 g/mol

• 31 g/mol

• 12 g/mol

Calculate the # of atoms in 20 g of Calcium?

• 3.00 X 10 ²³

• 6.02 x 10 ²³

• 2.55 x 10 ²³

• 9 x 10 ²³

Calculate the # of atoms in 18 g of Beryllium?

• 3.01 x 10²³

• 6.02 x 10²³

• 12.04 x 10²³

• 9.03 x 10²³

How many Oxygen atoms are in a molecule of (a) HNO₃ (b) H₂SO₄ (c) Pb (C₂O₄)₂ (d) Al (OH)₃

• 3,4,4,1

• 4,4,8,4

• 3,4,8,3

• 3,8,8,3

You have prepared 50 ml Sugar solution of molarity 1.5 M. if you dilute the solution by adding 200 ml more water to it, what would be the new volume and new molarity of the solution? ( Use dilution Equation , M₁V₁ = M₂V₂)

• 150, 0.1 M

• 200, 0.1 M

• 250 ml, 0.3 M

• 150, 0.3 M

A colorless liquid of Vinegar is mixed with colorless solution of Baking Soda in a test tube which results in a vigorous bubbling in the test tube.What is the evidence that a chemical reaction took place?

• The fact that the Temperature did not change.

• The fact you mixed two different liquids.

• The fact that the liquid begins to bubble

• The fact that a precipitate ( solid) formed.