Q: Convert $25.0 \\ ^\\circ$C to Kelvin and to Fahrenheit scale.

$298.15 \\ K$ and $77.0 \\ ^\\circ$F

Question 1

Which of the following statements about the scientific method is TRUE?

Accepted Answer

The scientific method emphasizes observation and experimentation as the way to understand the world.

Question 2

Which statement about a hypothesis is TRUE?

Accepted Answer

A hypothesis is a tentative explanation that can be tested by experiments.

Question 3

Which of the following is an example of an observation?

Accepted Answer

Water boils at 100 $^\circ$C.

Question 4

Which of the following represents a compound?

Accepted Answer

Water

Question 5

The correct scientific notation for the number 0.000423 is:

Accepted Answer

$4.23 \times 10^{-4}$

Question 6

The correct decimal representation of $6.423 \times 10^{4}$ is:

Accepted Answer

64,230

Question 7

The correct number of significant figures in the number 0.00250 is:

Accepted Answer

3

Question 8

How many significant digits should be reported in the answer to the following calculation? $4.23 \times 1.7 \div 2.56$

Accepted Answer

2

Question 9

The correct prefix for the multiplier 0.000001 is:

Accepted Answer

micro-

Question 10

What is the base SI unit for length?

Accepted Answer

meter

Question 11

A mass has dimensions of 10.0 in $\times$ 20.0 in $\times$ 8.0 in. Given that there are four feet in a yard, what is the volume of the mass in $m^3$?

Accepted Answer

$0.0262$ $m^3$

Question 12

Given the density of Au is $19.3 \ g/cm^3$, determine the mass of gold (in grams) in an ingot with the dimensions of $10.0 \ cm \times 10.0 \ cm \times 2.0 \ cm$.

Accepted Answer

$3860 \ g$

Question 13

Determine the density of an object that has a mass of $181.8 \ g$ and displaces $121.2 \ mL$ of water when placed in a graduated cylinder.

Accepted Answer

$1.50 \ g/mL$

Question 14

Which of the following statements about matter is FALSE?

Accepted Answer

Matter exists only as solids.

Question 15

Classify each as a pure substance or a mixture. If it is a pure substance, identify it as an element or a compound. If it is a mixture, identify it as homogeneous or heterogeneous: (a) air, (b) table salt, (c) iron, (d) salad.

Accepted Answer

Air: mixture, homogeneous; Table salt: compound; Iron: element; Salad: mixture, heterogeneous

Question 16

Classify each change as physical or chemical: (a) the tearing of paper, (b) a match igniting fireworks, (c) a can forming a penny when placed in a chemical wash, (d) coffee is brewed.

Accepted Answer

a) physical, b) chemical, c) chemical, d) chemical

Question 17

A chemist mixes $4.0 \ g$ of potassium iodide by combining $1.9 \ g$ of potassium with $2.1 \ g$ of iodine. Show that these results are consistent with the law of conservation of mass.

Accepted Answer

The total mass of reactants equals the mass of product: $1.9 \ g + 2.1 \ g = 4.0 \ g$.

Question 18

Energy that is associated with the motion of an object is called:

Accepted Answer

Kinetic energy

Question 19

Convert $25.0 \ ^\circ$C to Kelvin and to Fahrenheit scale.

Accepted Answer

$298.15 \ K$ and $77.0 \ ^\circ$F

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