Question

At the beginning of a science experiment, the temperature of Darnell's saltwater solution was –2°C. During the experiment, the change in the temperature of the solution was –5°C. What is the final temperature of the solution?

Answer 1

Answer:

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Step-by-step explanation:

Overview

In this 30-minute companion activity to The Melting Point, teams of children ages 8 to 13 experiment to find the melting and freezing points of water and ice.

What's the Point?

Water can exist in different states; ice is the solid state of water.

Physical properties are characteristics of a substance. They do not change. Physical properties include color, smell, freezing/melting point, and density.

The freezing point of water is the same as the melting point of ice: 32°F (0°C).

Materials

For each child

His/her Ice Investigator Journal

His/her envelope of mobile pieces

Pencil or pen

For each group of four to six children:

1 thermometer that is easily read, preferably in both Celsius and Fahrenheit, and that is safe for use by children

1 (7-ounce) cup or larger plastic container

1 (8-ounce) clear plastic cup

Enough foil to cover the top — but not the sides — of the cup

~5 cups of ice cubes (not crushed ice) (Make sure the ice cubes are loose and not stuck together.)

1 cup of crushed ice

~2 cups of rock salt (the kind used to make ice cream)

1 timer, stopwatch, watch, or clock with a second hand

Paper Towels

For the facilitator:

A permanent marker

2 activity set-ups to use for demonstration purposes (One will be identical to the children's, the other will include all steps but salt will be omitted.)

Background information

Preparation

Check the thermometers to ensure that they are working.

Prepare the activity set-ups you will use for demonstration during the activity.

Activity

1. Introduce the activity by discussing the freezing temperatures of water and the melting temperatures of ice.

At what temperature does water freeze? 32°F (0°C). Ask them about their

Answer 2

Answer:

-7

Step-by-step explanation:

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