Exam 1 hw pt.2

Do the following statements describe a chemical or physical change?

The helium inside a balloon tends to lead out after a few hours. Select the single best answer.

physical

Do the following statements describe a chemical or physical change?

The growth of plants depends upon the sun’s energy in a process called photosynthesis. Select the single best answer.

chemical

For each atomic number below, fill in the table for the name of the element, the number of protons, and the number of electrons.

Atomic number 18

Element name - Argon

Number of protons - 18

Number of electrons - 18

For each atomic number below, fill in the table for the name of the element, the number of protons, and the number of electrons.

Atomic number 51

Element name - Antimony

Number of protons - 51

Number of electrons - 51

What is the mass number of an iron atom that has 28 neutrons?

54

For the given atomic number ( Z ) and mass number ( A ), answer the following questions. Z = 39 , A = 90

Name the element

Yttrium

For the given atomic number ( Z ) and mass number ( A ), answer the following questions. Z = 39 , A = 90

Give the element symbol

Y

For the given atomic number ( Z ) and mass number ( A ), answer the following questions. Z = 39 , A = 90

Fill in the table below for the number of protons, neutrons, and electrons.

Yttrium:

Protons - 39

Neutrons- 51

Electrons - 39

For the atom 113/48 Cd, answer the following questions.

What is the atomic number?

48

For the atom 113/48 Cd, answer the following questions.

What is the mass number?

113

For the atom 113/48 Cd, answer the following questions.

Determine the number of protons, neutrons, and electrons.

Protons: 48

Neutrons: 65

Electrons: 48

Which element would you expect to show similar chemical properties to Cl. Select the single best answer.

F

Which of the following formulas represent covalent compounds?

H2SO4, CH4O, H2O, C2H7N

What is the charge of the ion derived from the potassium element?

+1

What is the charge of the ion derived from the Berillium element?

+2

What is the charge of the ion derived from the phosphorus element?

-3

What is the charge of the ion derived from the iodine element?

-1

What is the formula for the common ion element magnesium?

Mg²+

What is the formula for the common ion element cesium?

Cs+

What is the formula for the common ion element Phosphorus?

P³⁻

What is the formula for the common ion element Chlorine?

Cl⁻

An atom or ion has 9 electrons, 9 protons, and 10 neutrons.

neutral

An atom or ion has 36 electrons, 35 protons, and 46 neutrons.

negatively charged

An atom or ion has 18 electrons, 19 protons, and 20 neutrons.

positively charged

What is the ion symbol for 7 protons and 10 electrons?

N³-

What is the ion symbol for 23 protons and 21 electrons?

V²+

Write the name for the capital OH- ion.

hydroxide

Write the name for the following ionic compound, LiF

lithium fluoride

Write the name for the following ionic compound, Ba3N2

Barium nitride