Q: A student measures the boiling point of water at sea level to be $$99.8\ ^\circ\mathrm{C}. $$What is the percent error of the measurement? (The accepted value is $$100.0\ ^\circ\mathrm{C})$$

$$\displaystyle \frac{100.0 - 99.8}{100.0} \times 100\% = 0.2\%$$

Q: Convert $$5.00\ \mathrm{m} to $$centimeters using dimensional analysis.

$$5.00\ \mathrm{m} \times \frac{100\ \mathrm{cm}}{1\ \mathrm{m}} = 500\ \mathrm{cm}$$

Question 1

Which of the following best describes the difference between mass and weight?

Accepted Answer

Mass is the amount of matter in an object and remains constant, while weight is the force exerted on an object by gravity and can change depending on location.

Question 2

A student measures the boiling point of water at sea level to be $$99.8\ ^\circ\mathrm{C}. $$What is the percent error of the measurement? (The accepted value is $$100.0\ ^\circ\mathrm{C})$$

Accepted Answer

$$\displaystyle \frac{100.0 - 99.8}{100.0} 	imes 100\% = 0.2\%$$

Question 3

Which of the following is an example of a chemical change?

Accepted Answer

Rusting of iron

Question 4

Which separation technique would be most appropriate to separate a mixture of sand and salt water?

Accepted Answer

Filtration

Question 5

Which of the following statements is TRUE regarding significant figures?

Accepted Answer

Trailing zeroes after a decimal point are significant.

Question 6

A graduated cylinder contains $$65.0\ \mathrm{mL} of $$water. After a metal object is submerged, the water level rises to $$90.0\ \mathrm{mL}. If $$the mass of the object is $$50.0\ \mathrm{g}$$, what is its density?

Accepted Answer

$$2.00\ \mathrm{g/mL}$$

Question 7

Which of the following is a homogeneous mixture?

Accepted Answer

Salt dissolved in water

Question 8

Which of the following is an intensive property?

Accepted Answer

Density

Question 9

Convert $$5.00\ \mathrm{m} to $$centimeters using dimensional analysis.

Accepted Answer

$$5.00\ \mathrm{m} 	imes \frac{100\ \mathrm{cm}}{1\ \mathrm{m}} = 500\ \mathrm{cm}$$

Question 10

Which of the following is a pure substance?

Accepted Answer

Water ($$\mathrm{H}_2\mathrm{O})$$

Question 11

A solution contains $$0.500\ \mathrm{g} of $$vitamin C in $$100.0\ \mathrm{mL} of $$solution. What is the concentration in $$\mathrm{mg/mL}$$?

Accepted Answer

$$5.00\ \mathrm{mg/mL}$$

Question 12

Which of the following is an example of an exact number?

Accepted Answer

The number of students in a classroom

Question 13

Which of the following best describes a scientific theory?

Accepted Answer

A broad explanation that connects many observations and is strongly supported by evidence.

Question 14

How many significant figures are in the number $$0.0540$$?

Accepted Answer

3

Question 15

Which of the following is a chemical property?

Accepted Answer

Flammability

Question 16

A sample of gold has a mass of $$25.0\ \mathrm{g}$$ and a volume of $$1.30\ \mathrm{cm}^3. $$What is the density of gold?

Accepted Answer

$$19.2\ \mathrm{g/cm}^3$$

Question 17

Which of the following is a heterogeneous mixture?

Accepted Answer

Oil and vinegar salad dressing

Question 18

Which of the following is the correct SI prefix for $$10^{-9}$$?

Accepted Answer

Nano-

Question 19

Which of the following is NOT a physical property?

Accepted Answer

Corrosiveness

Question 20

A student adds $$2.367$$ and $$34.1. $$What is the answer with the correct number of decimal places?

Accepted Answer

$$36.5$$

Chapter 1: Matter and Energy – Foundations of General Chemistry

Guida di studio - Domande di pratica

Study guide - Flashcard