semster 1 exam

Which of the following is not evidence of a chemical change?

• A precipitate being formed
• Gas bubbles being produced
• Light production
• A liquid freezing into a solid

Which of the following is a chemical change?

• A glass hiting the floor and breaking
• Wrapping paper being torn
• A chocolate bar melting in the car on a hot day
• A cake being made in the oven.

Which of the following is a physical change?

• A bathroom filling up with steam from a hot shower
• Toasting toast
• Boiling an egg
• Fireworks being set of in the sky

A physical change is one in which the substance in not changed at the molecular level.

• True
• False

Chemical changes result in new products.

• True
• False

Which of the following is a chemical property?

• flammability
• color
• texture
• shape

Which of the following is a physical property?

• mass
• pH
• toxicity
• corrosiveness

Density is a intensive property, meaning the amount present does not change the property.

• true
• false

Which of the following states of matter are the most compressible?

• solid
• liquid
• gas

This state of matter has a fixed volume and shape.

• solid
• liquid
• gas
• plasma