Vocabulary
Anything that has mass and takes up space.
What is matter?
Oxygen dissolving in water without changing into a new substance is an example of this.
What is a physical property?
The amount of matter in an object.
What is mass?
A reaction that releases heat to its surroundings.
What is an exothermic reaction?
In a balanced chemical equation, this number shows how many units of a substance take part in the reaction.
What is a coefficient?
A characteristic that can be observed without changing a substance into something else.
What is a physical property?
Salad dressing that separates into layers is this type of mixture.
What is a heterogeneous mixture?
Compared to Earth, an object on the Moon would have less of this but the same mass.
What is weight?
Burning natural gas on a stove is this type of change.
What is a chemical change?
The balanced form of: ___ H₂ + ___ O₂ → ___ H₂O
What is 2 H₂ + O₂ → 2 H₂O?
The basic unit from which all matter is made.
What is an atom?
Two or more atoms chemically bonded together form this.
What is a molecule?
A property that does not change when an object’s shape changes, like density.
What is an intrinsic property?
Ice melting into liquid water is an example of this type of change.
What is a physical change?
In the equation ___ CaCO₃ → ___ CaO + ___ CO₂, this is the coefficient of calcium carbonate after balancing.
What is 1?
A mixture that is uniform throughout.
What is a homogeneous mixture?
Water (H₂O) is classified as this because it contains hydrogen and oxygen in a fixed ratio.
What is a compound?
Soccer balls have mass of 15 oz. 100 g = 3.5 oz. This is the mass of the ball in grams.
What is 429 g?
The arrow (→) in a chemical equation means this.
What is “yields,” “forms,” or “produces”?
In the equation ___ Fe + ___ O₂ → ___ Fe₂O₃, this is the coefficient in front of oxygen gas after balancing.
What is 3?
The principle that explains why equations must be balanced.
What is the law of conservation of mass?
The force of attraction that holds atoms together.
What is a chemical bond?
If an object has a mass of 10 g and a density of 2 g/cm³, this is its volume.
What is 5 cm³?
This should never be changed when balancing an equation.
What are subscripts?
After balancing equation ___ Na + ___ Cl₂ → ___ NaCl, this is the sum of the coefficients.
What is 5?