Question 1

Which of the following properties of an unknown element is a chemical property?
1. It appears as a silvery liquid.
2. It has a density of 13.53 g/cm$$^3 at $$room temperature.
3. It reacts with molecular iodine to produce a red solid.
4. It freezes at $$-38.83\ ^\circ\mathrm{C}$$ and boils at $$356.73\ ^\circ\mathrm{C}.
5. It $$forms a yellow solid when combined with dilute nitric acid.

Accepted Answer

Physical properties: 1, 2, 4; Chemical properties: 3, 5

Question 2

Which of the following statements uses exact numbers?

Accepted Answer

(b) and (d)

Question 3

Refer to the graduated cylinder and ruler images. What is the volume of the liquid in the graduated cylinder (a) and the height of the vial (b), both with the correct number of significant figures?

Accepted Answer

(a) 75.0 mL; 3 significant figures; (b) 6.42 cm; 3 significant figures

Question 4

Which is the larger quantity: $$5.3 	imes 10^2$ mL or 6.4$$ 	imes $$10^6$$ μL?

Accepted Answer

$$6.4 	imes 10^6$ μL

Question 5

How do chemical properties influence chemical reactions?

Accepted Answer

They determine the types of reactions and products formed.

Question 6

Given the natural isotopes of sulfur:
$$^{32}\mathrm{S}$$, 94.99%, 31.972 amu
$$^{33}\mathrm{S}$$, 0.75%, 32.971 amu
$$^{34}\mathrm{S}$$, 4.25%, 33.968 amu
$$^{36}\mathrm{S}$$, 0.01%, 35.967 amu
Calculate the atomic weight of sulfur.

Accepted Answer

32.065 amu

Question 7

Which of the following best describes a semimetal (metalloid)?

Accepted Answer

Semimetals lie on an imaginary staircase (from boron, B, to astatine, At) and have characteristics of both metals and non-metals.

Question 8

Name the following elements with the symbols: Rh, Si, O, P

Accepted Answer

Rhodium, Silicon, Oxygen, Phosphorus

Question 9

Classify the following elements:
1) Mg
2) H
3) Cl
4) No
5) P
6) Fe
A. Alkali Metal
B. Alkaline Earth Metal
C. Pnictogen
D. Chalcogen
E. Halogen
F. Noble Gas
G. Transition Metal
H. Inner Transition Metal
I. Representative Element
J. Lanthanide
K. Actinide

Accepted Answer

1) Mg: B, I, 2) H: I , 3) Cl: E, I , 4) No: K, H , 5) P: C, I , 6) Fe: G

Question 10

Which isotope symbol is incorrect?
(i) $$^{40}_{19}\mathrm{P}
(ii$$) $$^{120}_{50}\mathrm{Sn}
($$iii) $$^{29}_{63}\mathrm{Cu}
(iv$$) $$^{109}_{47}\mathrm{Au}
(v$$) $$^{58}_{26}\mathrm{Fe}$$

Accepted Answer

(i), (iii) and (iv)

Question 11

If the plum-pudding model of the atom were correct, what would be the outcome of Rutherford's gold foil experiment?

Accepted Answer

The alpha particles will travel straight through the gold foil with little to no deflection.

Question 12

Cesium iodide has a cesium to iodine mass ratio of 1.047:1. When a sample of cesium iodide is completely decomposed, 27.88 g of cesium is produced. What mass of iodine (in grams) is produced?

Accepted Answer

29.19 g

Question 13

Refer to the molecular diagrams provided. Which product mixture illustration obeys the law of conservation of mass for a reaction between the blue and red molecules?

Accepted Answer

Second image after the reactant mixture

Question 14

A scientist in a parallel universe performs the Millikan oil-drop experiment and obtains the following charges for four oil droplets (A, B, C, D):
A: $$2.06 	imes 10$$^{-11}$$ ga
B: 2.75$$ 	imes $$10^{-11} ga
C$$: $$4.13 	imes 10$$^{-11}$$ ga
D: 5.50$$ 	imes $$10^{-11} ga
$$What is the charge on a single electron in ga units?

Accepted Answer

$$3.44 	imes 10$$^{-12}$$ ga

Question 15

A sample of nicotine, $$\mathrm{C}_{10}\mathrm{H}_{14}\mathrm{N}_2$$, contains $$3.561 	imes 10$$^{25}$$ nitrogen atoms. Calculate the number of nicotine molecules in the sample.

Accepted Answer

15.42 mol

Question 16

Which statement of Dalton's atomic theory corresponds to the law of multiple proportions?

Accepted Answer

Compounds are made of 2 or more different types of atoms in fixed, simple, whole number ratios.

Question 17

Provide the name of the cation and anion in MoF$$_6$$ and identify the charges of each.

Accepted Answer

cation: molybdenum, +6; anion: fluoride, –1

Question 18

Provide the correct formula for the following ions with correct charges:
i. Cyanide ion
ii. Bisulfite ion
iii. Perchlorate ion
iv. Oxalate ion
v. Phosphite ion
vi. Bromate ion

Accepted Answer

i. CN$$^-$$, ii. HSO$$_3^-$$, iii. ClO$$_4^-$$, iv. C$$_2O$_4$$^{2-}$$, v. PO$$_$$3^{3-}$$, vi. BrO$$_3^-$$

Question 19

Based on the knowledge of the acids and oxyanions of bromine, name the following acids and anions:
HBrO
BrO$$^-$$
HBrO$$_2$$
BrO$$_2^-$$
HBrO$$_3$$
BrO$$_3^-$$
HBrO$$_4$$
BrO$$_4^-$$

Accepted Answer

HBrO: Hypobromous acid
BrO$$^-$$: Hypobromite ion
HBrO$$_2$$: Bromous acid
BrO$$_2^-$$: Bromite ion
HBrO$$_3$$: Bromic acid
BrO$$_3^-$$: Bromate ion
HBrO$$_4$$: Perbromic acid
BrO$$_4^-$$: Perbromate ion

Question 20

Provide the chemical formula for each of the given binary compounds below:
(a) palladium(IV) sulfide
(b) rubidium selenide
(c) molybdenum(VI) iodide
(d) niobium(V) sulfide

Accepted Answer

(a) PdS$$_2$$; (b) Rb$$_2Se$$; (c) MoI$$_6$$; (d) Nb$$_2S$_5$$

General Chemistry Exam 1 Practice Guidance

Guida di studio - Domande di pratica

Study guide - Flashcard