Counting atoms

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How many Hydrogen are in 4H₂O?

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8

Answer explanation

In 4H2O, each water molecule (H2O) contains 2 hydrogen atoms. Therefore, 4H2O has 4 x 2 = 8 hydrogen atoms. The correct answer is 8.

Tags

NGSS.MS-PS1-1

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How many Oxygen are in H₂O?

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1

Answer explanation

In H₂O, there is 1 oxygen atom. The chemical formula indicates that for every 2 hydrogen atoms, there is 1 oxygen atom, making the correct answer 1.

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NGSS.MS-PS1-1

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How many Magnesium are in 10MgCl₂?

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10

Answer explanation

In the compound 10MgCl2, the 'Mg' represents magnesium. Since there are 10 units of MgCl2, there are 10 magnesium atoms present. Therefore, the correct answer is 10.

Tags

NGSS.MS-PS1-1

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Number of H in 3(NH₄)₂CrO₄

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24

Answer explanation

In 3(NH₄)₂CrO₄, each NH₄ has 4 H atoms. There are 2 NH₄ groups per formula unit, giving 8 H atoms. Since there are 3 formula units, the total is 3 x 8 = 24 H atoms. Thus, the correct answer is 24.

Tags

NGSS.MS-PS1-1

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How many atoms are there TOTAL in: H₂SO₄?

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7

Answer explanation

H₂SO₄ consists of 2 hydrogen (H) atoms, 1 sulfur (S) atom, and 4 oxygen (O) atoms. Adding them together: 2 + 1 + 4 = 7. Therefore, the total number of atoms in H₂SO₄ is 7.

Tags

NGSS.MS-PS1-1

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How many elements are in C₆H₁₂O₆?

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3

Answer explanation

C6H12O6 contains three different elements: carbon (C), hydrogen (H), and oxygen (O). Therefore, the correct answer is 3.

Tags

NGSS.MS-PS1-1

Front

How many Nitrogen atoms are in (NH₄)₂CrO₄?

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2

Answer explanation

In (NH₄)₂CrO₄, there are 2 ammonium ions (NH₄) per formula unit. Each ammonium ion contains 1 nitrogen atom, so there are 2 nitrogen atoms total in the compound.

Tags

NGSS.MS-PS1-1

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How many Sodium atoms are in 6NaCl?

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6

Answer explanation

In the formula 6NaCl, there are 6 units of NaCl. Each unit contains 1 Sodium (Na) atom. Therefore, 6NaCl contains 6 Sodium atoms in total.

Tags

NGSS.MS-PS1-1

Front

How many atoms are there TOTAL in H₂SO₄?

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7

Answer explanation

H2SO4 consists of 2 hydrogen (H) atoms, 1 sulfur (S) atom, and 4 oxygen (O) atoms. Adding these gives 2 + 1 + 4 = 7 atoms in total. Therefore, the correct answer is 7.

Tags

NGSS.MS-PS1-1

Front

How many CARBONs are in this formula?

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4

Answer explanation

The formula contains 4 carbon atoms, which is indicated by the presence of 'C' in the molecular structure. Therefore, the correct answer is 4.

Tags

NGSS.MS-PS1-1