Elements
What element is represented by a capital H?
Hydrogen
Name one sign that a chemical reaction has occurred.
Color change, bubbles (gas production), temperature change
What kind of variable does a scientist change on purpose?
Independent
How many hydrogen atoms are in H2O?
2
What is the Conservation of Matter?
Nothing is ever created or destroyed
What element is represented by a capital O?
Oxygen
What has to happen between 2 or more molecules for a chemical reaction to occur?
Collision
What kind of variable changes in response to the independent variable?
Dependent
How many carbon atoms are in CH4?
1
What does (g) mean when written after a molecular formula?
Gas phase
What element is represented by a capital C?
Carbon
Why do you have to bend a glow stick to make it glow?
To mix the chemicals
Describe a confounding variable.
An additional variable in an experiment that the scientist didn't account for.
How many elements are there in CO?
2
What does (s) mean when written after a molecular formula?
Solid phase
What is the chemical symbol for sodium?
Na
What is the scientific name of something that makes a chemical reaction go at a faster rate?
Catalyst
Describe a controlled variable.
Any aspect of an experiment that stays the same from trial to trial.
How many elements are there in Co?
1
What does (aq) mean when written after a molecular formula?
In an aqueous solution
What is the chemical symbol for chlorine?
Cl
What is "activation energy"?
The energy required for a chemical reaction to take place
What is a hypothesis?
A scientists guess as to how an experiment will turn out.
What does the coefficient 3 mean when it is written before H2O? (3 H2O)
There are 3 water molecules
What is malic acid and what does it do?
The acid in apples responsible for a sour taste