Unit 2 Pretest A

What is the correct symbol representation for a species that contains 52 protons, 77 neutrons, and 46 electrons?

• ¹¹⁶Sn⁴⁺

• ¹⁵N³⁻

• ⁷⁴Ge⁴⁻

• ¹²⁹Te⁺⁶

• ¹⁰⁶Pd⁻¹

Tags

NGSS.HS-PS1-1

How many protons, neutrons and electrons are contained in the following isotope of the ion ²⁹Si⁴-?

• 14 protons, 29 neutrons, and 10 electrons

• 15 protons, 29 neutrons, and 11 electrons

• 14 protons, 15 neutrons, and 18 electrons

• 15 protons, 14 neutrons, and 11 electrons

• 29 protons, 14 neutrons, and 33 electrons

Tags

NGSS.MS-PS1-1

An atom or ion has 12 protons, 14 neutrons, and 11 electrons. Which of the following would be the mass number?

• 12 amu

• 28 amu

• 24 amu

• 26 amu

• 14 amu

Tags

NGSS.MS-PS1-1

How many protons, neutrons and electrons are found in the following isotope of the ion ¹²⁸I⁺⁷?

• 53 protons, 75 neutrons, 46 electrons

• 75 protons, 128 neutrons, 68 electrons

• 75 protons, 53 neutrons, 82 electrons

• 53 protons, 75 neutrons, 60 electrons

• 128 protons, 53 neutrons, 121 electrons

Tags

NGSS.MS-PS1-1

How many protons, neutrons, and electrons are found in a neutral atom of ⁹⁵Mo?

• 42 protons, 95 neutrons, 42 electrons

• 42 protons, 53 neutrons, 53 electrons

• 42 protons, 53 neutrons, 42 electrons

• 53 protons, 95 neutrons, 53 electrons

• 53 protons, 42 neutrons, 42 electrons

Tags

NGSS.MS-PS1-1

Which statement accurately compares an Sr atom and an Sr ion with a charge of +2?

• the Sr ion has more protons than the Sr atom resulting in a positive charge

• the Sr ion has less protons than the Sr atom resulting in a positive charge

• the Sr ion has less electrons than the Sr atom resulting in a positive charge

• the Sr ion has more electrons than the Sr atom resulting in a positive charge

Which statement below is FALSE?

• 14.01 g of N = 1 mol of N

• 1 mol of Li = 6.022 x 10²³ g of Li

• 19.00 g of F = 1 mol of F

• 24.31 g of Mg = 6.022 x 10²³ atoms of Mg

• 6.022 x 10²³ atoms of B = 10.81 g of B

How many grams of sodium are in 3.00 moles of sodium?

• 0.130 g

• 7.66 g

• 20.0 g

• 26.0 g

• 69.0 g

How many moles of argon are in 107.4 g of argon?

• 1.799 mol

• 2.688 mol

• 3.577 mol

• 4.466 mol

• 5.355 mol

How many moles of lithium are in 9.82 x 10²³ atoms of lithium?

• 1.45 mol

• 1.54 mol

• 1.63 mol

• 1.72 mol

• 1.81 mol