Counting Atoms
What tells you the number of atoms?
Subscript
Which of these is not a physical change?
Cutting paper
Milk Souring
Dissolving sugar
Milk Souring
TUESDAY TRIPLE
Which of these is not a chemical change?
Digestion
Evaporation
Frying an egg
Evaporation
What is the cute saying we use to remember the indicators of a chemical change?
People everywhere can't stand Bieber
What tells you the number of Molecules?
Coefficient
TUESDAY TRIPLE
Is evaporation a physical or chemical change?
Physical- change in state of matter
DAILY DOUBLE
Which of these indicates a chemical change has occurred?
Sinking, Floating, Bubbles, Dissolving
Bubbles
Smell
How many atoms of each element are there in the following chemical formula:
NH3
1 atom of Nitrogen
3 atoms of Hydrogen
How many atoms of each element are present in the chemical formula?
(SO4)3
3 atoms of Sodium
12 atoms of Oxygen
True or False??
If a chemical equation is balanced then the mass of the reactants will be equal to the mass of the products.
TRUE
What is the indicator of a chemical change when a solid is formed?
Precipitate
Reactants come _______ the arrow.
(Before or after)
BEFORE
DAILY DOUBLE
Write the chemical formula for:
3 atoms of Iron and 4 atoms of Oxygen
Fe3O4
In the baking soda and vinegar lab where the balloon inflated, what evidence of a chemical change did we observe?
Bubbles/ gas formation
True or False:
Food coloring in water indicates a chemical change.
False- the color change must be UNEXPECTED
Products come _________ the arrow
(before or after)
After
How many TOTAL ATOMS are present in the following chemical formula:
Fe3O4
Fill in the blanks:
Matter _____be created or ______.
Cannot
Destroyed
DAILY DOUBLE
Gas production, color change, temperature change, and precipitate produced are all:
A. Chemical properties
B. Evidence of a Physical change
C. Evidence of a Chemical change
C. Evidence of a chemical change