Question | Answer |
Can elements be separated into simpler substances? | No. Elements always stay as they are. |
What are compounds made up of? | Two or more elements. |
Can a compound be separated chemically or physically? | A compound can only be separated chemically. A compound has a chemical formula and it always made in a specific ratio. |
What is a mixture made up of? | Two or more substances. |
Can a mixture be separated physically or chemically? | A mixture can be separated physically and has no chemical change. |
What is a heterogeneous mixture? | In a heterogeneous mixture, you can see all the parts. A heterogeneous mixture is not completely combined. ex. italian dressing, chocolate chip pancakes |
What is a homogeneous mixture? | In a homogeneous mixture, you cannot see all the parts. A homogeneous mixture is completely mixed and appears the same throughout. ex. saltwater, baked cake |
What is a physical change? | happens when matter changes size, shape, or form ex. water boiling (liquid to gas) |
What is a chemical change? | any change that results in the creation of a new chemical substance |
What is density? | mass/volume
substances that are denser contain more matter in a certain volume |
What is an example of density? | Lead is very dense while aluminium is not |
What is an example of a chemical change? | baking soda and vinegar reacting to create foam |
What is matter? | anything that has mass and takes up space |
What is an atom? | an atom is composed of matter; the smallest part of an element |
What are protons, electrons and neutrons? | protons: positively charged particles within the atom
neutrons: neutrally charged particles within the atom
electrons: negatively charged particles within the atom |