Vocabulary
What vocabulary word is the part of the experiment that stays the same?
control
Is this a chemical reaction?
Sugar dissolves in water.
No
(We can separate the sugar and water again).
What is iodine an indicator for?
starch
Read the experiment.
I put soil in three small pots. I plant a bean seed in each pot. I give each plant 1/2 cup of water each time. I water the first plant every day, the second plant every 2 days, and the third plant every 3 days. I put all the plants on the window sill.
What is the control (or controls)?
3 small pots, bean seeds, 1/2 water, window sill
What vocabulary word is the part of the experiment that changes?
variable
Is this a chemical reaction?
Metal gets wet and begins to rust.
Yes
(It made a new substance. We can't get the metal back.)
What is red cabbage juice (or pH paper) an indicator for?
acids and bases
Read the experiment.
I put soil in three small pots. I plant a bean seed in each pot. I give each plant 1/2 cup of water each time. I water the first plant every day, the second plant every 2 days, and the third plant every 3 days. I put all the plants on the window sill.
What is the variable (or variables)?
how often the plant gets watered
What vocabulary word means something that can be observed using your senses?
physical property
Is this a chemical reaction?
Water freezes and becomes ice.
No
(It is still water. I can melt the ice and get the water back.)
You are doing a test to find out what foods have starch. You add a few drops of iodine to each food. How will you know which have starch?
The foods will turn purple-black.
True or False:
Experiments can have many variables.
No, experiments should have only one variable, or only one part that changes.
What vocabulary word means two or more chemicals make a completely different substance?
chemical reaction
Is this a chemical reaction?
Oil and water separate when mixed.
No
(It is still water and oil.)
What happens to red cabbage juice (or pH paper) to show that something is an acid or base?
It will change color.
True or False:
Experiments can have many controls.
Yes, an experiment can have many controls, or the parts that stay the same.
What vocabulary word means a chemical used to detect the presence of another substance?
indicator
Is this a chemical reaction?
I burn wood and it turns to ash.
Yes
(A new substance is created. It can't change back to wood).
Why would you use red cabbage juice (or pH paper)?
It tells if something is an acid or base.
What is the difference between a control and a variable?
A variable changes and a control stays the same.