Q: Given the following isotopic data for element X: $^{10}X$ (mass $= 10.01$ amu, abundance $= 20 ext{ extpercent}$), $^{11}X$ (mass $= 11.01$ amu, abundance $= 80 ext{ extpercent}$), calculate the atomic mass of X.

$10.01 \times 0.20 + 11.01 \times 0.80 = 10.81$ amu

Question 1

Which experimental law provides evidence that the total mass of substances remains unchanged during a chemical reaction?

Accepted Answer

The Law of Conservation of Mass

Question 2

Which atomic model was supported by the results of the gold foil experiment conducted by Rutherford in 1911?

Accepted Answer

Nuclear Model

Question 3

An atom has 17 protons, 18 neutrons, and 17 electrons. What is its atomic number and mass number?

Accepted Answer

Atomic number $= 17$, Mass number $= 35$

Question 4

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 5

Given the following isotopic data for element X: $^{10}X$ (mass $= 10.01$ amu, abundance $= 20	ext{	extpercent}$), $^{11}X$ (mass $= 11.01$ amu, abundance $= 80	ext{	extpercent}$), calculate the atomic mass of X.

Accepted Answer

$10.01 	imes 0.20 + 11.01 	imes 0.80 = 10.81$ amu

Question 6

Which of the following ions is a polyatomic ion with a $-2$ charge?

Accepted Answer

Sulfate $($SO$_4^{2-})$

Question 7

Which property is characteristic of metals in the periodic table?

Accepted Answer

Lustrous and easy to shape

Question 8

What is the correct chemical formula for the compound formed between Fe$^{3+}$ and CO$_3^{2-}$?

Accepted Answer

$	ext{Fe}_2(	ext{CO}_3)_3$

Question 9

Which of the following is the correct systematic name for the compound $	ext{PCl}_3$?

Accepted Answer

Phosphorus trichloride

Question 10

Which statement best describes a cation?

Accepted Answer

An ion with fewer electrons than protons and a positive charge

Question 11

Which of the following is the correct nuclide symbol for a potassium isotope with 19 protons and 21 neutrons?

Accepted Answer

$^{40}_{19}	ext{K}$

Question 12

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

Accepted Answer

$(	ext{NH}_4)_2	ext{S}$

Question 13

Which of the following acids is classified as an oxyacid?

Accepted Answer

H$_2$SO$_4$(aq)

Question 14

What is the charge and location of a neutron in an atom?

Accepted Answer

Charge $= 0$, located in the nucleus

Question 15

Which of the following ions is a common monatomic ion with a $+2$ charge?

Accepted Answer

Mg$^{2+}$

Question 16

Which of the following is the correct chemical formula for dinitrogen pentoxide?

Accepted Answer

$	ext{N}_2	ext{O}_5$

Question 17

Which group in the periodic table contains elements that are all gases at room temperature and are chemically inert?

Accepted Answer

Noble gases

Question 18

What is the empirical formula for a compound containing 2 magnesium ions and 2 chloride ions?

Accepted Answer

$	ext{MgCl}_2$

Question 19

Which of the following is the correct name for HNO$_2$(aq)?

Accepted Answer

Nitrous acid

Question 20

Which statement best describes the arrangement of elements in the periodic table?

Accepted Answer

Elements are arranged by increasing atomic number.

Atoms, Elements, and Chemical Compounds: Foundations of General Chemistry

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