BMS 8th Sci unit 2 mid unit

which of the following correctly identifies the number of each element involved in the chemical formula NH₄CO₃?

• N:4

  H:4

  C:3

  0:3

• N:1

  H:1

  C:1

  O:3

• N:0

  H:4

  C:0

  O:3

• N:1

  H:4

  C:1

  O:3

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Shown here is the chemical formula for ammonia. NH₃. The 3 in the chemical formula means that there are three-

• atoms of ammonia

• molecules of ammonia

• atoms of hydrogen in each molecule

• atoms of nitrogen in each molecule

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Which of the following accurately describes the number of aluminum and oxygen atoms in Al₂O₃?

• 3 atoms of aluminum and 2 atoms of oxygen

• 2 atoms of aluminum and 3 atoms of oxygen

• 2 atoms of aluminum and 1 atom of oxygen

• 1 atom of aluminum and 3 atoms of oxygen

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the chemical formula for baking soda is NaHCO_3.

How many atoms of carbon are present in baking soda?

• 2

• 3

• 1

• 0

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Look at this formula - (NH₃)₂CO₃

How many atoms of Hydrogen (H) are present in this formula?

• 2

• 4

• 6

• 8

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A chemical formula is provided below. The Subscripts in a chemical formula represent the-

• the number of atoms of the element infront of the subscript

• the atomic mass of the heaviest element in the compound

• atomic number of the element that follows the subscript

• column on the periodic table of the element next to it

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Water is an example of a compound. Which of the following is the best description of all compounds?

• A substance that cannot be broken down into simpler substances

• a substance that is made up of more than one kind of atom

• a material that has a specific density at a specific temperature

• a group of atoms that have different abilities when joined together

a student created a chart to show some common compounds. which of the following chemical formulas are written correctly?

CO², H₂O, NACL, NO_3, O₂, ₆C₁₂H₆0

• ₆C₁₂H₆0

• NACL

• NO₃

• CO²

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A model of a chemical compound is shown.

what is the correct way to write the formula for this compound?

• H₂O₂

• H0₂

• 2H₂0

• 2H2O

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The atomic number of krypton is 36. If the mass number of a krypton atom is 84, how many particles are inside and outside the nucleus of the krypton atom?

• inside the nucleus: 36

  outside (electron cloud: 36

• inside the nucleus: 36

  outside (electron cloud: 48

• inside the nucleus: 84

  outside (electron cloud: 36

• inside the nucleus: 84

  outside (electron cloud: 48

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