Question 1

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture in which the components are not uniformly distributed, such as sand in water.

Question 2

Which of the following compounds contains a dipole-dipole intermolecular force?

Accepted Answer

H$$_2S$$

Question 3

What is the electron geometry and molecular shape of CH$$_4$$?

Accepted Answer

Electron geometry: tetrahedral; Molecular shape: tetrahedral

Question 4

Which element has the greatest metallic character among the following: F, Fr, O, Mg?

Accepted Answer

Fr

Question 5

How many significant figures are in the number 0.003?

Accepted Answer

1

Question 6

Which of the following is the correct chemical formula for ammonium chlorate?

Accepted Answer

NH$$_4$$ClO$$_3$$

Question 7

Convert 238 K to $$^\circC. $$Use the formula $$T_{^\circ C} = T_K - 273.15.$$

Accepted Answer

$$-35.15^\circC$$

Question 8

Which of the following best describes the bond angle in CO$$_2$$?

Accepted Answer

$$180^\circ$$

Question 9

Which of the following is NOT a characteristic of noble gases?

Accepted Answer

They readily form compounds with other elements.

Question 10

What is the charge of the cation in MgCl$$_2$$?

Accepted Answer

$$+2$$

Question 11

Which of the following elements is found in Group 4A Period 2 of the periodic table?

Accepted Answer

Carbon (C)

Question 12

A sample contains $$2.0 	imes 10$$^{23}$$ molecules of NaCl. How many moles of NaCl are present? Use 1$ mole = 6.022$$ 	imes $$10^{23}$$ molecules.

Accepted Answer

$$0.33$$ moles

Question 13

Which of the following compounds is polar?

Accepted Answer

H$$_2S$$

Question 14

Which intermolecular force is present in H$$_2O $$that is not present in CH$$_4$$?

Accepted Answer

Hydrogen bonding

Question 15

Which of the following statements about electron geometry and molecular shape is correct for H$$_2S$$?

Accepted Answer

Electron geometry: tetrahedral; Molecular shape: bent

Question 16

Which of the following elements has the greatest electronegativity?

Accepted Answer

F

Question 17

What is the atomic number of Uranium (U)?

Accepted Answer

92

Question 18

Which of the following is the correct chemical formula for copper (II) sulfate?

Accepted Answer

CuSO$$_4$$

Question 19

Which of the following best describes the electron configuration of a cation?

Accepted Answer

It has fewer electrons than protons.

Question 20

Which of the following is the correct conversion for 1.03 g of NaCl to moles? (Molar mass of NaCl = 58.44 g/mol)

Accepted Answer

$$0.0176$$ moles

Midterm 1 Review: Matter, Atoms, Compounds, and Chemical Quantities

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