Atoms and molecules

The formula unit mass of Al₂SO₃ is

• 236 u

• 432 u

• 342 u

• 180 u

The smallest unit of an element that retains the properties of that element is called

• A Molecule

• An atom

• A proton

• A neutron

The Chemical formula of Ammonium Chloride is

• NH₄Cl₂

• (NH₄)Cl

• (NH₄)₂Cl₂

• NH₄Cl

4.4 g of CO₂ is equal to ______mol

• 0.1

• 0.2

• 2.0

• 0.3

The percentage of copper and oxygen in samples of “CuO” obtained by different methods were found to be the same. This illustrates the law of:

• Constant proportions

• Conservation of mass

• Multiple proportions

• Reciprocal proportions

Tags

NGSS.HS-PS1-7

How many molecules are present in 2.00 moles of H₂O?

• 124 x 10²⁴  molecules of H₂O

• 1.20 x 10²³  molecules of H₂O

• 1.20 x 10²⁴ molecules H₂O

• 124

Tags

NGSS.HS-PS1-7

Which of the following has the maximum number of particles?

• 8 g of CH₄

• 4.4 g of CO₂

• 34.2 g of C₁₂H₂₂O₁₁

• 2 g of H₂

Tags

NGSS.MS-PS1-1

In a reaction A + B ----> C,  reactant A has 5g and product  C has 9g. How many grams does reactant B should have? 

• 4g
• 5g
• 9g
• 14g

Tags

NGSS.HS-PS1-7

The atomicity of oxygen in Aluminium Oxide is

• 1

• 2

• 3

• 6

What is the mass of 0.40 mol of CO₂

• 18.6 g

• 12.8 g

• 17.6 g

• 40 g

Tags

NGSS.HS-PS1-7