Vocab
Substances that make up all of the universe. Has mass and volume.
What is matter?
A way of listing the elements. They are listed in the table by the structure of their atoms.
What is a chemical change?
A ____________ is any quality of an object-- anything about it-- that doesn’t change.
What is a property?
When baking biscuits, the baking soda releases carbon dioxide and causes the dough to rise.
Chemical, new substance CO2
Changes that don’t alter the identity of the substance undergoing the change.
What is a physical change?
From left to right elements are lined up in rows based on this number, the number of protons in their nucleus, which is also known as?
What is the atomic number?
2 or more of the same atoms connected by a chemical bond. They exist naturally on Earth.
What is an element?
Physical properties describe known substances. They are a characteristic of a substance that can be _____________ without changing what the substance is.
What is observed?
A few drops of food coloring is added to a cup of water to give it color.
Physical change, just a mixture
Changes that result in the formation of new substances.
What is a chemical change?
When elements are lined up based on their atomic numbers, elements in the columns have ________ properties.
What are similar?
A substance consisting of more than one type of atom chemically combined. This is the general term which includes elements and compounds.
What is a molecule?
Since properties are unchanging, the properties of an unknown substance can help us ____________ it. The properties of a substance also help us predict what it can do.
What is identify?
Riley (the dog) chews on a bone Ms. Hampton gave her.
Physical change, the bone is just getting broken into smaller pieces
A force of attraction that holds two atoms together.
What is a bond (chemical bond)?
The columns of the periodic table.
What are groups?
2 or more different atoms connected by a chemical bond.
What is a compound?
Chemical properties are on the _______________ level. They answer the question, what is the substance made of?
What is molecular?
You forgot to dry the bread knife when you washed it and reddish brown spots (rust) appeared on it.
Chemical Change, rust is a new substance
Chemical and physical properties that define attributes of a pure substance.
What are characteristic properties?
There are 18 columns and different groups have different _______________.
What are properties?
In the compound H2O, how many atoms of each substance are needed to make the molecule? How do you know?
2 Hydrogens and 1 Oxygen. The subscript tells us.
Properties of matter that can only be observed when a substance is transformed into new substances.
What are chemical properties?
Melting butter for popcorn
Physical change, the butter is just changing states (phase change)