Chem Equat and Law of Cons of Mass

The chemical formula for acetic acid is CH3COOH. How many hydrogen atoms are in one molecule of acetic acid?

• 3

• 4

• 5

• 6

Which statement is an accurate comparison of the formula for ammonia (NH₃) and the formula for sodium hydroxide (NaOH)?

• The formula for sodium hydroxide has more atoms and more elements than the formula for ammonia.

• The formula for ammonia has more atoms and more elements than the formula for sodium hydroxide.

• The formula for sodium hydroxide has more atoms, but the formula for ammonia has more elements.

• The formula for ammonia has more atoms, but the formula for sodium hydroxide has more elements.

Tags

NGSS.MS-PS1-1

The mineral albite is composed of four elements and has the chemical formula NaAlSi₃O₈. Which of these elements does albite contain?

• A. Astatine

• B. Sulfur

• C. Nitrogen

• D. Aluminum

Tags

NGSS.MS-PS1-1

How many more oxygen atoms are represented in the formula for barium sulfate, BaSO₄ than in the formula for barium hydroxide, Ba(OH)₂?

• 2

• 1

• 3

• 0

Tags

NGSS.MS-PS1-1

A compound secreted by honeybees to paralyze intruders in their hive is known as 2-heptanone. The formula for this compound is shown. CH₃C₄H₈COCH₃ How many atoms of each element are in one molecule of 2-heptanone?

• 4 carbon atoms, 11 hydrogen atoms, and 1 oxygen atom

• 7 carbon atoms, 14 hydrogen atoms, and 1 oxygen atom

• 7 carbon atoms, 11 hydrogen atoms, and 8 oxygen atoms

• 6 carbon atoms, 14 hydrogen atoms, and 3 oxygen atoms

Tags

NGSS.MS-PS1-1

Which elements are represented in the formula AND how many atoms of each element are represented in the formula Na₂SO₄?

• The elements represented are sodium (Na), sulfur (S), and oxygen (O). There are 2 sodium atoms, 1 sulfur atom, and 4 oxygen atoms in the formula.

• The elements represented are sodium (Na), sulfur (S), and oxygen (O). There are 1 sodium atom, 2 sulfur atoms, and 4 oxygen atoms in the formula.

• The elements represented are sodium (Na), sulfur (S), and oxygen (O). There are 2 sodium atoms, 4 sulfur atoms, and 1 oxygen atom in the formula.

• The elements represented are sodium (Na), sulfur (S), and oxygen (O). There are 4 sodium atoms, 1 sulfur atom, and 2 oxygen atoms in the formula.

Tags

NGSS.MS-PS1-1

A chemical equation is shown. Which statement correctly compares the number of atoms in the reactant and in the products?

• The number of atoms in each molecule of liquid water is equal to the number of atoms in each molecule of oxygen gas.

• The number of atoms in each molecule of hydrogen peroxide is equal to the number of atoms in each molecule of oxygen gas.

• The total number of atoms in the hydrogen peroxide molecules is equal to the total number of atoms in the liquid water and oxygen gas molecules.

• The total number of atoms in the hydrogen peroxide molecules is equal to the total number of atoms in each molecule of liquid water.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

A chemical equation for the reaction between calcium hydroxide, Ca(OH)2, and sulfuric acid, H2SO4, is shown. The masses of some of the reactants and products are given in grams. Ca(OH)₂ + H₂SO₄ → CaSO₄ + 2H₂O 74 g ? 136 g 36 g How many grams of sulfuric acid were used in the reaction?

• 62 g

• 98 g

• 36 g

• 100 g

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2