physical science

Fifteen grams of a liquid plastic are frozen in a physical change that increases the volume. What can be known about the plastic after the change?

A) It will weigh more than 15 grams.
B) It will have an increased density.
C) It will still weigh 15 grams.
D) It will still have the same density.

I'd like an explanation rather than an answer, if possible. I just don't understand this question.

  1. 👍
  2. 👎
  3. 👁
  1. There are two bits of information here. First, you know the material weighed 15 grams. Second, you know it increased in volume. You must address both of those.
    In the answers, both a and c deal with mass. a says it weighs more; c says it weighs the same. Do you think freezing anything causes the mass of it to change. Of course not. So c must be correct.
    Both b and d deal with density. b says it increases; d says it stays the same. You know density = mass/volume. You know mass is 15 grams and it doesn't change. The statement in the problem says volume increases. So if the denominator of d = m/v gets larger what happens to the density. It gets smaller. So neither b nor d are correct. The only correct answer there is c. Do you have trouble seeing that the mass doesn't change. Suppose we have a piece of paper that has a mass of 15 g and cut it into two pieces. Guess what. The two pieces still have a mass of 15 g. What if we put it in the freezer at -20. It still has a mass of 15 g. What if we burn the two pieces of paper. Burning the paper converts it into CO2(a gas), water (a gas at burning temperatures), and leaves charred paper pieces. If we collect the charred paper remnants, and the water, and the CO2 gas all of that will weigh 15 g. Hope this helps.

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Biology

    How does the size of a cell’s surface area change compared to its volume when the cell grows? a. The surface area remains constant as the volume changes. b. The surface area increases at the same rate the volume does. c. The

  2. physics

    A foam plastic of density of 0.58g/cm^3 is to be used as a life jacket.What volume of the plastic must be used if it is to keep 20percent by volume of an 80kg physics student above water in a lake if the average density of the

  3. chemistry

    1. Ideal gas particles: A. have no mutual attraction and no individual volume. B. have no mass or volume. C. have no odor and no color. D. have no density and do not form bonds. Is it A? 2. Why does the density of gas in a hot air

  4. science

    A student is given a sample of an unknown liquid to test in the laboratory. The student thinks that the liquid is water. Which of the following properties of the sample is most helpful to determine if the liquid is water? A. color

  1. Chem

    A bicycle tire is filled with air to a pressure of 100 psi at a temperature of 19C. Riding the bike on asphalt on a hot day increases the temperature of the tire to 58C. The volume increases by 4%. What is the new pressure of the

  2. Chemistry

    a change in pressure would have the greatest effect on the solubility of a A. solid in a liquid B. gas in a liquid C.liquid in a liquid D.liquid in a solid in an aqueous solution of potassium chloride, the solute is A. Cl B. KCl

  3. science

    1. The ability of an apple to change color when exposed to air is a ____. (1 point)physical property chemical property physical change chemical change 2. Which of the following is NOT a possible sign of a physical change? (1

  4. Chemistry

    What happens to these physical properties as the strength of intermolecular forces increases? My answers are there as well but its not correct Increase or decrease? a) melting point - increases b) vapor pressure-increases c)

  1. Science

    To answer these questions you will need to refer to the volume of water dripping over time graph that you created in your science notebook from interactive art plotting a line graph activity. 1. According to the trend shown by the

  2. Chem Lab

    Am I right? Classify the following properties of sodium metal as physical or chemical: •Silver metallic color—physical property •Turns gray in air—physical property •Melts at 98º C-melting point is physical property

  3. Science

    Which observation most likely indicates that a physical change has taken place?(1 point) A. A reaction occurs. B. An odor occurs. C. The temperature increases. D. The process is reversible. Why is freezing water a physical

  4. physical science

    when a physical change in a sample occurs which of the following does not change? a. shape b. temperature c. volume d. composition d?

You can view more similar questions or ask a new question.