STRAIGHTERLINE CHEMISTRY FINAL EXAM

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STRAIGHTERLINE CHEMISTRY FINAL EXAM

CORRECT SOLUTIONS.

What is the term used for findings that are summarized based on a pattern or trend?

• Law
• Hypothesis
• Theory
• Phenomena
• Prediction - correct answer- a. Law

Which of the following is a tentative explanation for a set of observations?

Select one:

• Law
• Hypothesis
• Theory
• Phenomena
• Prediction - correct answer- b. Hypothesis

If a liquid contains 60% sugar and 40% water throughout its composition then what is it called? 1 / 4

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Select one:

• Solute
• Compound
• Homogeneous mixture
• Heterogeneous mixture
• Solvent - correct answer- c. Homogeneous mixture

Which of the following does not have a uniform composition throughout?

Select one:

• Element
• Compound
• Homogeneous mixture
• Heterogeneous mixture
• Solvent - correct answer- d. Heterogeneous mixture

Which one of these represents a physical change?

Select one:

• Water, when heated, forms steam.
• Bleach turns hair yellow.
• Sugar, when heated, becomes brown.
• Milk turns sour. 2 / 4

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• Apples, when exposed to air, turn brown. - correct answer- a.

Water, when heated, forms steam.

How many micrograms are in 65.3 kg?

Select one:

• 0.653 μg
• 6.53 × 107 μg
• 6.53 × 104 μg
• 6.53 × 10-8 μg
• 6.53 × 1010 μg - correct answer- e. 6.53 × 1010 μg

A smart phone has dimensions of 4.9 inches (height), 2.3 inches (width) and 8.0 millimeters (depth). What is the volume of the smart phone in cubic centimeters? (1 in = 2.54 cm)

Select one:

• 58 cm3
• 1.7 x 105 cm3
• 90 cm3
• 3.4 cm3
• 34 cm3 - correct answer- a. 58 cm3

Given that 1 inch = 2.54 cm, 1.00 cm3 is equal to

Select one: 3 / 4

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• 16.4 in3
• 6.45 in3
• 0.394 in3
• 0.155 in3
• 0.0610 in3 - correct answer- e. 0.0610 in3

What terms defines a mass which is exactly equal to 1/12 the mass of one carbon-12 atom?

Select one:

• Isotope number
• Mass number
• Mass-to-charge ratio
• Atomic number
• Atomic mass unit - correct answer- e. Atomic mass unit

How many neutrons are there in an atom of lead whose mass number is 208?

Select one:

• 82
• 126
• 208
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