Q: A sample of dry ice (solid $$\mathrm{CO_2$}) $$has a mass of 10.8 g. How many molecules of $$\mathrm{CO_2$}$$ are present in the sample? ($$\mathrm{C = 12.01\ g/mol}$$, $$\mathrm{O = 16.00\ g/mol}$$, $$\mathrm{N_A = 6.022 \times 10$$^{23}$$\ $$mol^{-1}$$})$$

$$1.48 \times 10$$^{23}$$ molecules

Question 1

Which of the following best explains why the properties of sodium chloride (NaCl) are so different from those of elemental sodium and chlorine?

Accepted Answer

The properties of compounds are generally very different from the properties of the elements that compose them due to the formation of chemical bonds.

Question 2

Which type of chemical bond involves the transfer of electrons from one atom to another, resulting in the formation of ions?

Accepted Answer

Ionic bond

Question 3

Which of the following compounds is classified as a molecular compound?

Accepted Answer

CO2

Question 4

What is the empirical formula for glucose, whose molecular formula is $$\mathrm{C_6H_{12}O_6$}$$?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 5

Which of the following elements exists naturally as a diatomic molecule?

Accepted Answer

Chlorine

Question 6

Which of the following is the correct formula for the compound formed between aluminum and oxygen?

Accepted Answer

$$\mathrm{Al_2O_3}$$

Question 7

What is the correct name for the compound $$\mathrm{$$FeCl_3$$}$$?

Accepted Answer

Iron(III) chloride

Question 8

Which of the following is the correct formula for potassium dichromate?

Accepted Answer

$$\mathrm{K_2Cr_2O_7}$$

Question 9

Which of the following is the correct name for $$\mathrm{Ba(NO_3$)_2}$$?

Accepted Answer

Barium nitrate

Question 10

A sample of dry ice (solid $$\mathrm{CO_2$}) $$has a mass of 10.8 g. How many molecules of $$\mathrm{CO_2$}$$ are present in the sample? ($$\mathrm{C = 12.01\ g/mol}$$, $$\mathrm{O = 16.00\ g/mol}$$, $$\mathrm{N_A = 6.022 	imes 10$$^{23}$$\ $$mol^{-1}$$})$$

Accepted Answer

$$1.48 	imes 10$$^{23}$$ molecules

Question 11

Calculate the mass percent of phosphorus (P) in glyphosate ($$\mathrm{C_3H_8NO_5P}$$). ($$\mathrm{C = 12.01\ g/mol}$$, $$\mathrm{H = 1.00\ g/mol}$$, $$\mathrm{N = 28.02\ g/mol}$$, $$\mathrm{O = 16.00\ g/mol}$$, $$\mathrm{P = 30.97\ g/mol})$$

Accepted Answer

14.5%

Question 12

Which of the following best describes a metallic bond?

Accepted Answer

Electrons are delocalized and free to move throughout a lattice of metal cations.

Question 13

What is the correct name for $$\mathrm{H_2SO_3}$$?

Accepted Answer

Sulfurous acid

Question 14

Which of the following is the correct formula for cobalt(III) nitrate?

Accepted Answer

$$\mathrm{Co(NO_3$)_3}$$

Question 15

A hydrate of magnesium sulfate contains 7 water molecules per formula unit. What is its correct name?

Accepted Answer

Magnesium sulfate heptahydrate

Question 16

Which of the following is a correct statement about the naming of molecular compounds?

Accepted Answer

Prefixes are used to indicate the number of each type of atom present.

Question 17

How many grams of phosphorus are in 25.0 grams of glyphosate ($$\mathrm{C_3H_8NO_5P}$$)? ($$\mathrm{C = 12.01\ g/mol}$$, $$\mathrm{H = 1.00\ g/mol}$$, $$\mathrm{N = 28.02\ g/mol}$$, $$\mathrm{O = 16.00\ g/mol}$$, $$\mathrm{P = 30.97\ g/mol})$$

Accepted Answer

3.62 g

Question 18

Which of the following is the correct name for $$\mathrm{$$KClO_4$$}$$?

Accepted Answer

Potassium perchlorate

Question 19

Which of the following best describes the basic unit of an ionic compound?

Accepted Answer

Formula unit

Chapter 3: Molecules, Compounds, and Chemical Nomenclature – General Chemistry Study Notes

Guida di studio - Domande di pratica

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