2/5 Counting Atoms ADV

How many atoms of each element are in the compound described by the chemical formula (CH₃)₂N?

• 2 Carbon, 6 Hydrogen, 1 Nitrogen
• 1 Carbon, 6 Hydrogen, 1 Nitrogen
• 3 Carbon, 5 Hydrogen, 1 Nitrogen
• 2 Carbon, 4 Hydrogen, 2 Nitrogen

Tags

NGSS.MS-PS1-1

Using the periodic table, how many atoms does each element have in the formula Ba₃(PO₄)₂?

• Barium= 6

  Potassium= 2

  Oxygen= 8

• Barium= 3

  Phosphorous= 2

  Oxygen= 8

• Barium= 1

  Phosphorous=2

  Oxygen= 4

• Beryllium= 3

  Potassium= 2

  Oxygen= 4

Tags

NGSS.MS-PS1-1

Identify the atoms that make up the substance with the chemical formula: H₂SO₄

• Hydrogen, Sulfur, Chlorine

• Hydrogen, Nitrogen, Oxygen

• Hydrogen, Sulfur, Oxygen

• Carbon, Sulfur, Oxygen

Tags

NGSS.MS-PS1-1

Identify the number of each kind of atom in the chemical formula Fe₂O₃

• Iron= 1

  Oxygen=3

• Iron=2

  Oxygen=3

• Iron= 4

  Oxygen= 6

• Iron= 3

  Oxygen=2

Tags

NGSS.MS-PS1-1

What do these two chemical formulas have in common? CCl₄ and CBr₄

• They both use the same elements.

• Both have the same number of atoms.

• They both use Cl.

• They both use Br.

Tags

NGSS.MS-PS1-1

Elements and compounds are similar in some ways but different in others. They differ because– 

• • elements are made of only one type of atom, while compounds are made of a combination of two or more atoms of different elements. 

• • elements are made of a combination of two or more atoms of different elements, and compounds are made of only one type of atom.

• • elements are made of a combination of two of the same atoms, and compounds are made of a combination of two or more atoms of different elements. 

• • elements are made of a combination of two or more atoms of different atoms, and compounds are made of a combination of two or more of the same atoms. 

Label the different examples if they are an element or a compound:

Groups:

(a) Element

,

(b) Compound

• CO₂

• Fe

• Au

• Ne

• NaCl

• Pb

• NH₃

• H₂O

Tags

NGSS.MS-PS1-1

Chemical Formula 2Fe₂O₃ has 2 different elements ​ (a)   and oxygen. The coefficient is ​ (b)   . Iron has ​ (c)   atoms in this chemical formula. Oxygen has ​ (d)   atoms in this formula.

• iron
• 1
• 2
• 4
• 3
• 6
• 5
• Fluorine

Tags

NGSS.MS-PS1-1

Students are working on a lab that contains compounds. They are using this chemical formula: C₁₂H₂₂O₁₁

Which of the following statements would support that this formula represents a compound?

• This formula only includes one element.

• This formula includes several different elements.

• This formula cannot be broken into separate elements.

• This formula only contains symbols.

Tags

NGSS.MS-PS1-1

Which statement is a characteristic of only pure elements?

• Contains a single type of molecule

• Contains symbols and their values

• Cannot be broken down into simpler substances

• Can be identified in a limited number of ways.