Short Answers Flashcards
Difference between a solution and a heterogeneous mixture - examples.
A solution is a homogeneous mixture that consists of one phase and is uniform throughout. (salt water)
A heterogeneous mixture consists of more than one phase and isn’t uniform throughout. (sand)
Heterogeneous mixture (5 examples) and Homogeneous mixture (5 examples)
Heterogeneous: sand, oil, water, salt and chicken noodle soup.
Homogeneous: salt water, sugar water, mouthwash, coffee, air.
Example of a two phase mixture - explain.
Fountain soft drink: a liquid and a gas, heat up the liquid to capture the carbon dioxide.
Define a compound and an element.
A compound is two of more elements combined chemically.
An element is the simplest form of matter with a unique set of properties.
What does a chemical formula of a compound indicate?
The chemical formula of a compound indicates the amount of atoms in the formula. (H2O = 2+1 -> 3 atoms.)
What are two physical changes and two chemical changes that involve cooking.
Physical: boiling water on a pot and shredding a carrot.
Chemical: frying raw meat in a pan - raw to cooked, and a rotten banana fermenting on the counter for banana bread.
Difference between chemical and physical properties - example.
Chemical Property: a characteristic that allows you to change the substance into another substance chemically.
Example: flammability, toxicity, acidity and heat combustion.
Physical Property: characteristics that can be observed or measured without changing the chemicals composition.
Example: density, hardness, boiling/melting point, and color.
Difference between physical and chemical change - example.
Physical Change: a change that happens physically and doesn’t change the chemicals composition.
Example: boiling water.
Chemical change: a change that happens chemically and can change the substance of a chemicals composition.
Example: burning wood
State the law of conservation of mass and explain.
Law of Conservation of mass: is always making sure that the mass of products and the mass of reactants are always equal to each other.
