Missed Questions

Is this a balanced equation? How do you know?

• Yes, it is balanced because the number of atoms of each element is the same on both sides.

• No, it is not balanced because the number of atoms of each element is different on both sides.

• Yes, it is balanced because the coefficients are all equal.

• No, it is not balanced because the equation contains different compounds on each side.

How many elements are in this equation?

• There are 3 elements: Carbon (C), Hydrogen (H), and Oxygen (O).

• There are 2 elements: Carbon (C) and Oxygen (O).

• There are 4 elements: Carbon (C), Hydrogen (H), Oxygen (O), and Nitrogen (N).

• There is 1 element: Carbon (C).

Is it balanced? How do you know?

• Yes, it is balanced because both sides are equal.

• No, it is not balanced because one side is heavier.

• Yes, it is balanced because the weights are different.

• No, it is not balanced because the objects are the same.

How many elements are in 2 PCl3?

• 2

• 3

• 4

• 1

Is the equation is balanced? How do you know?

• Yes, The number of atoms of each element is the same on both sides.

• No. The number of atoms on the reactants side doesn't equal the product side.

• No. The equation contains only one element.

How many atoms are in 2 PCl3?

• 8

• 10

• 6

• 4

How many atoms are there in CO2 + 2H2O?

• 7

• 9

• 5

• 6

A compound can be separated. How or why is this possible?

• Because compounds are made of elements that can be separated by chemical means.

• Because compounds are mixtures that can be separated by physical means.

• Because compounds are pure elements that cannot be separated.

• Because compounds are already separated into atoms by physical changes.

In the equation, 46 grams of sodium (Na) reacted with 36 grams of water (H₂O). If 2 grams of hydrogen gas (H₂) are produced by this reaction, what is the mass of sodium hydroxide (NaOH) produced?

• 10 grams

• 44 grams

• 80 grams

• 82 grams

What happens to the particles of a substance as heat is increased?

• The particles move faster and spread apart.

• The particles stop moving completely.

• The particles become larger in size.

• The particles move slower and come closer together.