Q: Which of the following is the correct formula for percent error?

$$\frac{\lvert \text{observed value} - \text{predicted value} \rvert}{\text{predicted value}} \times 100\%$$

Question 1

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

Accepted Answer

Combustibility

Question 2

Boiling water is considered a physical change because:

Accepted Answer

It changes the state of water without changing its chemical composition

Question 3

Which statement best describes the law of conservation of energy?

Accepted Answer

Energy can only be converted from one form to another, but cannot be created or destroyed

Question 4

A student weighs a block four times and gets values close to each other but far from the true value. This indicates:

Accepted Answer

Low accuracy and high precision

Question 5

Which of the following is an extensive property?

Accepted Answer

Volume

Question 6

What is the correct SI base unit for measuring the amount of substance?

Accepted Answer

Mole

Question 7

A solution contains $$6.277\ \mathrm{g} of $$sodium chloride per $$1.00\ \mathrm{L} of $$solution. How many milligrams of sodium chloride are present in $$15.0\ \mathrm{mL} of $$this solution?

Accepted Answer

$$94.2\ \mathrm{mg}$$

Question 8

Which of the following is NOT a rule for determining significant figures?

Accepted Answer

Leading zeros are significant

Question 9

When multiplying or dividing numbers, the answer should have:

Accepted Answer

The same number of significant digits as the number with the least significant digits

Question 10

Which equation correctly converts temperature from Celsius to Kelvin?

Accepted Answer

$$K = ^\circ C + 273$$

Question 11

A nail rusts when exposed to air and moisture. This is an example of:

Accepted Answer

A chemical change

Question 12

Which of the following is a correct conversion factor for changing kilograms to grams?

Accepted Answer

$$1\ \mathrm{kg} = 1000\ \mathrm{g}$$

Question 13

Which of the following is an intensive property?

Accepted Answer

Density

Question 14

A student records a measurement as $$2.450\ \mathrm{cm}. $$How many significant figures does this value have?

Accepted Answer

4

Question 15

Which of the following best describes kinetic energy?

Accepted Answer

Energy associated with matter in motion

Question 16

If you sweat and water evaporates off your skin, making you feel cold, this is best explained by:

Accepted Answer

Evaporation is a physical change that absorbs energy from your skin

Question 17

Which of the following is the correct scientific notation for $$478\ 826\ 541$$?

Accepted Answer

$$4.78826541 	imes 10^8$

Question 18

Which of the following is true about dimensional analysis?

Accepted Answer

It ensures that units are properly converted and canceled through algebraic operations

Question 19

A measurement is recorded as $$0.0540\ \mathrm{g}. $$How many significant figures does this value have?

Accepted Answer

3

Question 20

Which of the following is the correct formula for percent error?

Accepted Answer

$$\frac{\lvert 	ext{observed value} - 	ext{predicted value} vert}{	ext{predicted value}} 	imes 100\%$$

Units of Measurement for Physical & Chemical Change – Chapter 1 Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard