Q: Calculate the percent error if the accepted value is $$8.50 \, g$$ and the measured value is $$8.20 \, g.$$

$$\displaystyle \frac{|8.20 - 8.50|}{8.50} \times 100 = 3.53\%$$

Question 1

Which of the following best defines chemistry?

Accepted Answer

The study of the composition, structure, properties, and changes of matter.

Question 2

Which of the following is an example of a chemical?

Accepted Answer

Oxygen gas ($$O_2)$$

Question 3

Which statement describes a qualitative observation?

Accepted Answer

The solution turned blue after adding copper sulfate.

Question 4

Which of the following is an extensive property?

Accepted Answer

Mass

Question 5

A student measures the mass of a sample four times and gets values close to each other but far from the true value. This is an example of:

Accepted Answer

High precision, low accuracy

Question 6

Calculate the percent error if the accepted value is $$8.50 \, g$$ and the measured value is $$8.20 \, g.$$

Accepted Answer

$$\displaystyle \frac{|8.20 - 8.50|}{8.50} 	imes 100 = 3.53\%$$

Question 7

Which of the following is a systematic error?

Accepted Answer

A balance that always reads 0.05 g too high.

Question 8

Express $$0.000456 in $$scientific notation.

Accepted Answer

$$4.56 	imes 10$$^{-4}$$

Question 9

How many significant figures are in the measurement $$0.04050$$?

Accepted Answer

4

Question 10

Which of the following is the correct SI unit for measuring temperature?

Accepted Answer

Kelvin ($$K)$$

Question 11

Convert $$250 \, mL to $$liters using the appropriate conversion factor.

Accepted Answer

$$0.250 \, L$$

Question 12

A medication is prescribed at $$5.0 \, mg/kg$$ for a $$70 \, kg$$ patient. How many milligrams should be administered?

Accepted Answer

$$350 \, mg$$

Question 13

A block has a mass of $$30.0 \, g$$ and a volume of $$12.0 \, cm^3$. What is its density?

Accepted Answer

$$2.50 \, g/cm^3$

Question 14

If a liquid has a density of $$0.85 \, g/mL$$, will a solid with a density of $$1.2 \, g/mL$$ sink or float in the liquid?

Accepted Answer

It will sink.

Question 15

Which of the following correctly compares the densities of solids, liquids, and gases under normal conditions?

Accepted Answer

Solids \u003e Liquids \u003e Gases

Question 16

What happens to the density of a gas if the temperature increases while pressure remains constant?

Accepted Answer

Density decreases.

Question 17

Which of the following is an intensive property?

Accepted Answer

Boiling point

Question 18

A student records the following measurements for the length of a rod: $$12.1 \, cm$$, $$12.2 \, cm$$, $$12.1 \, cm$$, $$12.2 \, cm. $$The true length is $$12.5 \, cm. $$Which statement is correct?

Accepted Answer

The measurements are precise but not accurate.

Question 19

Which of the following is the correct abbreviation for the SI unit of mass?

Accepted Answer

kg

Question 20

A sample of ethanol has a density of $$0.789 \, g/mL. $$What is the mass of $$50.0 \, mL of $$ethanol?

Accepted Answer

$$39.5 \, g$$

General Chemistry Study Guide: Chapters 1 & 2

Guida di studio - Domande di pratica

Study guide - Flashcard