Elicit - The Mole Concept

Which of the following is an INCORRECT unit conversion factor?

• 1 gram (g) = 2.2 pounds (lb)

• 1 foot (ft) = 12 inches (in)

• 1 liter (L) = 1000 milliliters (mL)

• 1 kilogram (kg) = 1000 grams (g)

Ramon is asked by his mother to buy exactly 450 grams of ground pork. However, the store only sells ground pork in kilograms. Following her mother’s request, how many kilograms of ground pork should he order?

• 0.20 kg

• 0.45 kg

• 0.50 kg

• 0.90 kg

Which of the following refers to pure substances?
I. element
II. mixture

III. solution

IV. compound

• I and II

• II and III

• III and IV

• IV and I

Which among these representative particles represents an ionic compound?

• ion

• atom

• molecule

• formula unit

Which among these representative particles represents a covalent compound?

• atom

• ion

• formula unit

• molecule

Tags

NGSS.MS-PS1-1

Claire measured the mass of 10 pieces of each of the following materials: marbles, pebbles, and seeds. What will be her findings based on the data she obtained?

• Different materials, regardless of quantity, have different masses.

• Materials of different kinds differ in amount, color, and texture.

• The same number of materials has different colors and appearance.

• The same number of materials of different kinds have different masses.

Tags

NGSS.MS-PS1-2

Based on the image below, what is the atomic mass of oxygen?

• 2

• -2

• 8

• 15.999

Tags

NGSS.HS-PS1-1

Which of the following pairs of chemical names and formulas is INCORRECT?

• table salt - NaCl

• sucrose - C₆H₁₂O₆

• hydrochloric acid - HCl

• sodium bicarbonate - NaHCO₃

Tags

NGSS.MS-PS1-1

Which of the following is correct in terms of the number of atoms of each element present in acetic acid (CH₃COOH)?

• carbon = 1, oxygen = 2, hydrogen = 3

• carbon = 2, oxygen = 2, hydrogen = 4

• carbon = 2, oxygen = 2, hydrogen = 4

• carbon = 1, oxygen = 1, hydrogen = 3

Tags

NGSS.MS-PS1-1

What is the molar mass (in grams per mole) of 1 mole of water (H₂O)?

Note: 1 mole of hydrogen = 1.008 grams per mole

1 mole of oxygen = 15.999 grams per mole

• 14.991 grams per mole

• 16,126.992 grams per mole

• 17.007 grams per mole

• 18.0166 grams per mole