The image shows two objects placed in different bowls containing the same type of liquid.
Object 1- the ball is floating on top of the liquid.
Object 2- the ball has sunk to the bottom of the liquid.
If each object displaces the same volume of liquid, then which of the following could be true?
(1 point)
Object 1 has a mass of 200 g, and Object 2 has a mass of 200 9.
Object 1 has a mass of 150 g, and Object 2 has a mass of 450 g.
Object 1 has a mass of 550 g, and Object 2 has a mass of 550
Object 1 has a mass of 450 g, and Object 2 has a mass of 150
Object 1 has a mass of 150 g, and Object 2 has a mass of 450 g.
This could be true because even though both objects displace the same volume of liquid and have different masses, the ball with a greater mass will sink lower in the liquid due to gravity pulling it down.
Betty placed an unknown powder in a zip lock bag. When she added water to the bag, the powder bubbled, and it disappeared. When the bubbling stopped, the bag contained a clear liquid and a lot of gas.
What is the MOST OBVIOUS indicator a chemical reaction occurred?
(1 point)
Responses
There was a change in temperature.
There was a change in temperature.
The powder mixed with the water.
The powder mixed with the water.
The powder changed color.
The powder changed color.
A gas was formed.
A gas was formed.
The formation of a gas is one of the most obvious indicators that a chemical reaction occurred, as it is evidence of a chemical change taking place.
There are several different indicators that a chemical change has taken place. Which of the following examples would be considered an indicator that a chemical reaction has taken place?(1 point)
Responses
Heat is given off after mixing two substances
Heat is given off after mixing two substances
A Substance has dissolved
A Substance has dissolved
A liquid freezes
A liquid freezes
The shape of paper changes as it is cut
The shape of paper changes as it is cut
Heat is given off after mixing two substances
This would be considered an indicator that a chemical reaction has taken place because the release of heat can signify an energy change, which often occurs during a chemical reaction.
Which of the following is a physical change?(1 point)
Responses
Decomposing
Decomposing
Burning
Burning
Rusting
Rusting
Melting
Melting
Melting is a physical change because it involves a change in the state of matter from solid to liquid, without altering the chemical properties of the substance.