Vocab
After your experiment you should________, ________, or ________ for future studies.
Repeat, share, or tweak
Have definite volume but not shape
liquid
Chemical equations represent different types of ______ ________.
chemical reactions
When the same element has two different masses. What causes this and what is it called?
differing number of neutrons
isotopes
There are 20 calories in ketchup. How much energy does it have?
20 calories
Everything is made of _______.
Matter
turning from a solid to a liquid
melting
rust, mold, bubbles are all things that tell a _____ change has/is taking place.
chemical
If an element loses a proton, what happens
it becomes a different element
What is the formula for density? what is the density of an object that has a volume of 30 ml and a mass of 10g?
D = m/v
D = .33
A hypothesis uses the words ___, ____ and ____. It is a guess that can be __________.
if, then and because.
tested.
turning from a gas to a liquid
condensation
atoms stop moving at the temperature of
absolute zero
What group on the periodic table would have 3 valence electrons.
hint: there are18 groups
Group 13
What tool can you use to find a mass of an object?
triple beam balance
The variable that the scientist controls and is the "cause"
Independent
type of reaction that changes the identity of a substance.
chemical reaction
what are the substances called in the beginning of a chemical reaction?
reactants
whats the difference between atomic mass and number?
what does each one tell you about an element?
atomic mass - protons and neutrons / tells you amount of neutrons
atomic number - #of protons/ tells you amount of protons and electrons
If an object has a density of 1.8 g/ml, will it sink or float in water and why?
sink because its greater than waters density which is 1g/ml.
The group that does NOT receive treatment.
Control
Melting cheese is a _____ change.
physical
two or more different atoms chemically combined is
compound
Why is group 18 known as noble gases?
They have 8 valence electrons
Their outermost ring is full
How many students did not do their packet last week?
9