WHMIS
This WHMIS symbol has a test tube pouring liquid on a hand what does it mean?
corrosive
This type of mixture is evenly mixed, like salt water (can be called two things what are they)
homogenous mixture or solution
Rows on the periodic table are called this.
periods
The number of protons in an atom tells you this
atomic number or electrons
This small number in a chemical formula tells how many atoms are present. What is it called?
subscript
Liquid changing into gas is called this.
Evaporation
This system in a chemical reaction, allows matter to enter or leave, so mass may appear to change.
Open system
This WHMIS symbol warns that a substance can cause death or poisoning
skull & crossbones
This type of mixture has visible parts, like salad. (Can be called 2 things what are they)
heterogenous mixture or mechanical mixture
Columns on the periodic table are called these.
groups or families
Protons and neutrons are found in this part of the atom.
nucleus
Compounds made from metals and non-metals are called this type.
Ionic compounds
Gas changing into liquid is called this.
Condensation
How many atoms are in CO₂?
3
These properties can be observed without changing the substance.
physical properties
A substance made from two or more elements chemically bonded.
compound
Elements in the same group have the same number of these type of electrons.
valence electrons
This equation finds the number of neutrons.
Atomic Mass minus atomic number
Compounds formed when non-metals bond with non-metals are called this.
Molecular compounds
A reaction that releases heat is called this.
exothermic
Where are the least reactive elements?
Noble gases on the right
These properties describe how a substance reacts to form a new substance.
chemical properties
This chart divides matter into pure substances and mixtures.
classification of matter
Elements in the same period have the same number of these.
electron shells or energy levels
the number of electrons equals this.
number of protons or atomic number
The name for NaCl.
Sodium Chloride
Mass of the reactants = mass of products is what law?
Law of conservation of Mass
What determines the size of an atom in a molecular model?
Higher atomic number
This process happens when metal reacts with oxygen and air or water over time. ***FYI there is no air in space**
corrosion
A substance dissolved in water is called this type of solution.
aqueous solution
This area of the periodic table contains the most reactive metals.
left- specifically bottom left
This model shows electrons arranged in shells around the nucleus. Also what is the arrangement of electrons in the first 3 outer shells?
Bohr Model- 2- 8- 16
What is the formula for calcium di-chlolride?
CaCl2
Temperature, concentration, catalyst and surface area are examples of these.
Factors affecting reaction rate
A solid substance produced in a chemical reaction between two non-solids is called a?
precipitate