Question

a. the temperature of the water.
b. the amount of water in the sample.
c. the type of salt mixed into the water.
d. the amount of salt that mixes in the water.
try this!!!!--variables in an experiment
read the scenario below, and then answer questions 4 - 5.
read: a botanist sets up an experiment by putting two identical plants in pots.
she then puts the pots in a special case together so that all environmental
conditions are the same for each plant. the botanist gives one plant only water.
she gives the other plant water plus nutrients. the botanist gives each plant the
same amount of water each day for thirty days and measures the growth of the
plants. she finds that the plant that received water plus nutrients grew twice as
fast as the plant that received only water. the botanist concludes that the
nutrients help the plant grows faster.
restate and answer the questions below:

1. what was the test (independent) variable in the botanists experiment?

the nutrients

1. what was the outcome (dependent) variable in the botanists experiment?

physical properties of matter practice ----use the list above to help answer the
questions below.

1. a spoon is placed in hot soup, and the handle quickly becomes warm.

which physical property of matter is being demonstrated in this scenario?

1. a scientist heats ice until it changes into liquid water.

which physical property of matter is being demonstrated in this scenario?

1. a student connects a wire to a light bulb and battery. the bulb lights

when a metal strip is added, but not when a rubber strip is used.
which physical property of matter is being demonstrated in this scenario?

1. two unknown powders are tested. one sinks in oil, while the other floats.

which physical property of matter is being demonstrated in this scenario?

Explanation:

1. The independent variable is what the experimenter changes. Here, the botanist gives one plant water and the other water plus nutrients, so nutrients are the independent variable.
2. The dependent variable is what is measured as a result of the change in the independent variable. The growth of the plants is being measured, so plant growth is the dependent variable.
3. Heat is transferred from the hot soup to the spoon handle, demonstrating thermal conductivity.
4. Changing ice to liquid water is a change of state, demonstrating the physical property of melting.
5. The metal strip allows electricity to flow and light the bulb while the rubber strip doesn't, showing electrical conductivity.
6. One powder sinks and the other floats in oil, demonstrating density.

Answer:

1. The nutrients
2. The growth of the plants
3. Thermal conductivity
4. Melting
5. Electrical conductivity
6. Density