Staar review

Which elements are represented in the formula for sodium sulfate (Na2SO4) and how many atoms of each element are represented in the formula?

• Sodium (Na) - 2, Sulfur (S) - 1, Oxygen (O) - 4

• Sodium (Na) - 1, Sulfur (S) - 2, Oxygen (O) - 4

• Sodium (Na) - 2, Silicon (Si) - 1, Oxygen (O) - 4

• Sodium (Na) - 1, Sulfur (S) - 1, Oxygen (O) - 2

Which of these statements about the mass of subatomic particles is true?

• The mass of a proton is the same as the mass of an electron.

• The mass of a neutron is the same as the mass of an electron.

• The mass of a neutron is much greater than the mass of a proton.

• The mass of a proton is much greater than the mass of an electron.

Which statement is true of the two elements' reactivity?

• Both are chemically reactive.

• Both are chemically nonreactive.

• Element X is more chemically reactive than Element Y.

• Element Y is more chemically reactive than Element X.

Which statement serves as evidence to support the answer to Part A?

• Both models show two shells surrounding the nucleus.

• Both models show ten neutrons in the nucleus.

• Element X has seven electrons in its outer shell.

• Element Y has an even number of protons and neutrons.

All the elements in Group 2 of the periodic table are classified as _______.

• nonmetals

• metals

• metalloids

• protons

Each element in Group 2 has fewer _______ than any of the elements in Group 17.

• nonmetals

• valence electrons

• neutrons

• protons

What is the mass of sulfuric acid (H₂SO₄) used in the reaction with calcium hydroxide (Ca(OH)₂) to produce calcium sulfate (CaSO₄) and water (H₂O)?

• 62 g

• 98 g

• 36 g

• 100 g

Which table correctly identifies the charges of subatomic particles?

• Table A

• Table B

• Table C

• Table D

Based on the information provided, what is the most likely identity of the wooden object?

• Bamboo

• English elm

• Plum

• Box

Based on its properties, which classification would Sample 1 most likely fall under?

• Metal

• Nonmetal

• Metalloid

• Cannot be determined from the information provided