States of Matter
Which state of matter has a definite shape and volume?
Solids
What charge are protons?
Positive
Do homogeneous mixtures have clumps or no clumps?
No clumps!
What is a property?
What we can observe or measure of a substance
Reactants are substances that go through a change, so products are....
formed from a change
What is the particle arrangement of a gas?
Moves freely at high speeds
What are atoms made of?
Protons, neutrons, electrons
Heterogenous mixtures can be colloids or...
suspensions
Is flammability a...
Chemical property
Chemical change
Physical property
Physical change
Chemical property
What is the big number in front of an element or molecule?
Coefficient
What is it called when a solid turns into a liquid?
Melting
What are valence electrons?
electrons that are found in the very last orbital
Pure substances are chemically combined. Can they be physically separated?
No
Janice mixed two substances together. Before, these two substances were malleable and magnetic, but now they are viscous and toxic. Is this a physical or chemical change?
Chemical change
Reactants are always ________ products
greater than
lesser than
equal to
Equal to
Plasma is made out of...
positively and negatively charged particles
What is the atomic number of sodium (Na)?
11
Is water (H20) a pure substance or a mixture?
Pure substance! It is a compound of 2 hydrogen (H) and 1 oxygen (O)
Dan poured salt into a glass of water. What physical property do we witness for the salt?
Solubility
How many oxygen atoms are in H2O?
1
How do you add more energy to particles?
Add heat!
If an element has 27 protons, how many electrons does it have?
27
What type of mixture has clumps that cannot be seen, and what is an example of it?
Colloids (milk, paint, coffee)
Water boiling is a physical change, because it is changing states (liquid to gas) but is still H2O
How many oxygen atoms are in 3HPO4?
12