Q: A sample absorbs $$1500\ \text{J} of $$heat, its mass is $$30\ \text{g}$$, and the temperature increases by $$10^\circ\text{C}. $$What is its specific heat?

$$5\ \text{J/g}^\circ\text{C}$$

Question 1

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

Accepted Answer

Iron rusting in moist air

Question 2

A student measures the length of a pencil as 12.45 cm. Which digit is estimated based on significant figures?

Accepted Answer

5

Question 3

Which of the following statements best describes a hypothesis in the scientific method?

Accepted Answer

A testable explanation for an observation

Question 4

Convert 0.0056 g to micrograms ($$\mug).$$

Accepted Answer

$$5600\ \mu	ext{g}$$

Question 5

Which element is a metalloid among the following?

Accepted Answer

Silicon (Si)

Question 6

A food contains 8 g of fat, 12 g of protein, and 20 g of carbohydrate. If fat provides $$9\ 	ext{kcal/g}$$, protein $$4\ 	ext{kcal/g}$$, and carbohydrate $$4\ 	ext{kcal/g}$$, what is the total energy content?

Accepted Answer

$$184\ 	ext{kcal}$$

Question 7

Which of the following is the correct scientific notation for 0.000072?

Accepted Answer

$$7.2 	imes 10$$^{-5}$$

Question 8

A sample of mercury has a mass of $$54.0\ 	ext{g}$$ and a volume of $$4.00\ 	ext{mL}. $$What is its density?

Accepted Answer

$$13.5\ 	ext{g/mL}$$

Question 9

Which group on the periodic table contains the noble gases?

Accepted Answer

Group 8A (18)

Question 10

What is the atomic symbol for an isotope of carbon with 6 protons and 8 neutrons?

Accepted Answer

$$^{14}_{6}	ext{C}$$

Question 11

Which type of radiation has the greatest penetrating power?

Accepted Answer

Gamma ray ($$\gamma)$$

Question 12

A radioactive isotope has a half-life of 3 hours. If you start with 80 g, how much remains after 9 hours?

Accepted Answer

$$20\ 	ext{g}$$

Question 13

Which of the following is a physical property?

Accepted Answer

Melting point

Question 14

What is the electron arrangement for magnesium (atomic number 12)?

Accepted Answer

2, 8, 2

Question 15

Which element has the highest ionization energy among the following?

Accepted Answer

Argon (Ar)

Question 16

A heating curve shows a plateau at $$100^\circ	ext{C}. $$What does this plateau represent?

Accepted Answer

Boiling point of the substance

Question 17

How many significant figures are in the measurement 0.04050 mL?

Accepted Answer

4

Question 18

Which of the following is a heterogeneous mixture?

Accepted Answer

Sand and iron filings

Question 19

If a solution contains 25 g of solute in 100 g of solution, what is the percentage concentration?

Accepted Answer

$$25\%$$

Question 20

A sample absorbs $$1500\ 	ext{J} of $$heat, its mass is $$30\ 	ext{g}$$, and the temperature increases by $$10^\circ	ext{C}. $$What is its specific heat?

Accepted Answer

$$5\ 	ext{J/g}^\circ	ext{C}$$

CHE103 Exam 1 Review: Chapters 1-5 Study Guide

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