Q: Calculate the amount of heat (in joules) required to raise the temperature of 50.0 g of water from $$20.0\ ^\circ\mathrm{C} to$$ $$80.0\ ^\circ\mathrm{C}. ($$Specific heat of water $$c = 4.18\ \mathrm{J/g\ ^\circ C})$$

$$Q = mc\Delta T = 50.0 \times 4.18 \times (80.0 - 20.0) = 12,540\ \mathrm{J}$$

Question 1

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Sand and iron filings

Question 2

Which process describes the direct change from a solid to a gas without passing through the liquid state?

Accepted Answer

Sublimation

Question 3

A sample of ice at $$-10\ ^\circ\mathrm{C} is $$heated until it becomes steam at $$110\ ^\circ\mathrm{C}. $$Which of the following correctly lists all the phase changes that occur?

Accepted Answer

Melting, boiling

Question 4

Which of the following statements about metals is CORRECT?

Accepted Answer

Metals are malleable and ductile.

Question 5

Which element from the provided list is a noble gas?

Accepted Answer

Neon (Ne)

Question 6

A student mixes vinegar (acetic acid) and baking soda (sodium bicarbonate) and observes bubbling and the formation of a new substance. This is an example of:

Accepted Answer

A chemical change

Question 7

Which of the following best describes the arrangement and movement of particles in a liquid?

Accepted Answer

Particles are close together but can move past one another.

Question 8

Which of the following is the correct electron configuration for magnesium (Mg, atomic number 12)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$

Question 9

Which of the following statements about atomic structure is TRUE?

Accepted Answer

Electrons are found outside the nucleus.

Question 10

A sample of copper (Cu) has an atomic number of 29 and a mass number of 64. How many neutrons does this atom have?

Accepted Answer

35

Question 11

Which of the following elements is a metalloid?

Accepted Answer

Boron (B)

Question 12

Which trend is observed as you move from left to right across a period in the periodic table?

Accepted Answer

Ionization energy increases

Question 13

Calculate the amount of heat (in joules) required to raise the temperature of 50.0 g of water from $$20.0\ ^\circ\mathrm{C} to$$ $$80.0\ ^\circ\mathrm{C}. ($$Specific heat of water $$c = 4.18\ \mathrm{J/g\ ^\circ C})$$

Accepted Answer

$$Q = mc\Delta T = 50.0 	imes 4.18 	imes (80.0 - 20.0) = 12,540\ \mathrm{J}$$

Question 14

Which of the following is a physical property?

Accepted Answer

Copper conducts electricity

Question 15

Which of the following best describes the difference between a compound and a mixture?

Accepted Answer

A compound is made of two or more elements chemically combined; a mixture is a physical blend of substances.

Question 16

Which of the following elements has the highest metallic character?

Accepted Answer

Potassium (K)

Question 17

Which of the following is the correct symbol for the element with 17 protons?

Accepted Answer

Cl

Question 18

Which of the following best describes the trend in atomic size as you move down a group in the periodic table?

Accepted Answer

Atomic size increases

Question 19

Which of the following statements about electron shells and subshells is CORRECT?

Accepted Answer

The second shell contains s and p subshells.

Question 20

A neutral atom of zinc (Zn) has an atomic number of 30 and a mass number of 65. How many protons, neutrons, and electrons does it have?

Accepted Answer

30 protons, 35 neutrons, 30 electrons

CHM101 Test 1 Review: Matter, Elements, and Atomic Structure

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