Which particles are found in the nucleus of an atom?

• Protons and electrons

• Protons and neutrons

• Electrons and neutrons

• Protons, neutrons, and electrons

What are the reactants and products in a chemical reaction?

• Reactants are the substances that undergo a change, and products are the substances formed after the change.

• Reactants are the substances formed after a change, and products are the substances that undergo a change.

• Reactants and products are the same substances.

• Reactants and products are different substances, but they have the same properties.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

This is how you find the number of neutrons in an atom. 

• Subtract the atomic number from the mass number

• Subtract the atomic mass from the atomic number 
• Add the atomic mass to the atomic number 
• Divide the atomic mass by the atomic number 

Which Element has the least mass?

• Lithium

• Hydrogen

• Beryllium

• Oxygen

6CO₂+6H₂O+Sunlight -> C₆H₁₂O₆+6O₂

How many Carbon Atoms are in the reactant side of the above equation?

• 12

• 2

• 6

• 24

Tags

NGSS.MS-PS1-1

What type of chemical reaction is this equation an example of?

• Synthesis Reaction

• Decomposition Reaction

• Combustion Reaction

• Precipitation Reaction

What type of chemical reaction is this equation an example of?

• Displacement reaction

• Synthesis reaction

• Neutralisation reaction

• Precipitation reaction

Which is the correct electron configuration for carbon?

• 
• 
• 
• 

Tags

NGSS.HS-PS1-1

How many sulfur atoms are present in Al₂(SO₄)₃

• 1

• 2

• 3

• 4

Answer explanation

In Al₂(SO₄)₃, there are 3 sulfate (SO₄) groups. Each sulfate contains 1 sulfur atom, so 3 sulfate groups contribute 3 sulfur atoms in total. Therefore, the correct answer is 3.

Tags

NGSS.MS-PS1-1

What type of reaction is the following: Fe + CuSO4 -> FeSO4 + Cu?

• Combustion reaction

• Decomposition reaction

• Double replacement reaction

• Single replacement reaction

Answer explanation

The reaction Fe + CuSO4 -> FeSO4 + Cu is a single replacement reaction because iron (Fe) displaces copper (Cu) from copper sulfate (CuSO4), forming iron sulfate (FeSO4) and releasing copper.