Q: A 50.0 g block of metal absorbs 400 J of heat, causing its temperature to rise from 20.0 °C to 28.0 °C. What is the specific heat capacity of the metal? Use $$q = m c \\Delta T.$$

$$c = 0.80 \\ \mathrm{J/g$$^{\circ}$$C}$$

Question 1

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

Accepted Answer

Dissolving table salt in water

Question 2

A sample contains two substances that can be separated by filtration. Which type of mixture is this?

Accepted Answer

Heterogeneous mixture

Question 3

Which statement best describes the difference between a compound and a mixture?

Accepted Answer

A compound is made of two or more elements chemically bonded, while a mixture is a physical blend of substances.

Question 4

Which of the following elements is a metalloid?

Accepted Answer

Silicon (Si)

Question 5

A 50.0 g block of metal absorbs 400 J of heat, causing its temperature to rise from 20.0 °C to 28.0 °C. What is the specific heat capacity of the metal? Use $$q = m c \Delta T.$$

Accepted Answer

$$c = 0.80 \ \mathrm{J/g$$^{\circ}$$C}$$

Question 6

Which process describes the change of state from a gas directly to a solid?

Accepted Answer

Deposition

Question 7

Which of the following best describes the electron configuration of a neutral oxygen atom?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^4$$

Question 8

Which of the following statements about metals is correct?

Accepted Answer

Metals are malleable and ductile.

Question 9

A neutral atom of phosphorus (P) has an atomic number of 15 and a mass number of 31. How many neutrons does it have?

Accepted Answer

16

Question 10

Which of the following changes is a chemical change?

Accepted Answer

Burning propane in a grill

Question 11

Which of the following best explains why noble gases are generally unreactive?

Accepted Answer

They have full valence electron shells.

Question 12

Which element has the highest ionization energy among the following?

Accepted Answer

Fluorine (F)

Question 13

A sample contains 80% isotope A (mass = 10 amu) and 20% isotope B (mass = 11 amu). What is the average atomic mass of the element?

Accepted Answer

$$10.2 \ \mathrm{amu}$$

Question 14

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout

Question 15

Which of the following statements about atomic theory is correct?

Accepted Answer

Atoms of the same element have identical properties.

Question 16

Which of the following is NOT a physical property?

Accepted Answer

Reactivity with acid

Question 17

Which element is most likely to be found as a diatomic molecule in nature?

Accepted Answer

Nitrogen (N)

Question 18

Which of the following best describes the trend in metallic character across a period in the periodic table?

Accepted Answer

It decreases from left to right.

Question 19

Which of the following is the correct electron configuration for a sodium ion ($$Na^+$$)?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$

Question 20

Which of the following best describes the process of sublimation?

Accepted Answer

A solid changing directly to a gas

GOB Chemistry Study Guide: Matter, Energy, Elements, and Atomic Structure

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