2.0 PAT review Flashcards
What does WHMIS stand for?
WORKPLACE HAZARDOUS MATERIALS INFORMATION SYSTEM
What three shapes do Safety Hazard Symbols use? What does each mean?
Triangle: yellow/caution
Diamond: orange/warning
Octagon: red/danger
Explain the difference between Physical and chemical property?
Physical is a change in state but not a change in composition like Chemical properties do
Density/luster etc vs reaction with acids ability to burn reaction with water behaviour in air reaction to heat.
Physical and chemical change?
Physical change: reversible, cut and tear into tiny pieces, no new substance is formed, melting point, boiling point.
chemical change: impossible to reverse, temp change, colour change, another substance is formed, combustion.
Pure substance and mixture?
Pure substance - a substance made of only one kind of matter, which has a unique set of properties. a mixture that you cant see all the properties.
Mixture - a combination of pure substances; unlike a compound, the components of a mixture do not combine chemically and are not always in the same ratio. You are able to see different properties in the mixture.
Element and a compound?
Elements - a pure substance that cannot be broken down into other substances; substances made up of only one type of atom
Compounds - a chemical combination of two or more elements in a specific ratio
The solution, suspension, colloid and mechanical mixture?
Sol’s -homogeneous mixture; a mixture of two or more pure substances that looks like one substance
Suspension - cloudy mixture in which tiny particles of one substance are held within another and the particles can be separated out
A colloid-cloudy mixture in which tiny particles of one substance are held within another and particles cannot be separated out from the other substance
MM - heterogeneous mixture; mixture in which the different substances that make up the mixture are visible
What scientist discovered the electron?
JJ. Thomson
What scientist discovered the neutron?
Chadwick
What scientist believed matter was made up of 4 elements?
Aristotle
What scientist believed atoms were like Billiard Balls?
Dalton
What scientist developed the Law of Conservation of Mass?
Lavoisier
What scientist discovered the nucleus?
Rutherford
What scientist atom was a (+) sphere with electrons orbiting around?
Nagaoka
What scientist put the electrons on fixed energy levels (shells)?
Bohr
Where are the groups, families and periods on the periodic table?
Groups: the horizontal numbers at the top. (1-6)
Family: noble gas, halogen, alkaline metals, alkali metals.
Periods: the vertical numbers on the sides. (1-18)
What is potassium Element, Protons, Neutrons, Electrons, Mass Number?
Element: K Protons: 19 Neutrons: 20 Electrons 19 Mass Number: 39.10
For each substance below, indicate the number of each kind of atom present:
a. CH4 b. NH3 c. CH3OH d. O2
1 Carbon, 1 nitrogen 1 carbon 2 oxygen
4 hydrogen 3 hydrogen 4 hydrogen
1 oxygen
What kinds of elements form an ionic compound? A molecular compound?
Ionic compounds are made up of metal and non-metal. Molecular is made up of 2 or more non-metals combined.
Describe two tests you could perform to decide if a compound is ionic or molecular?
Test its conductivity, see its state of matter at room temperature, boiling point or melting points.
For the following compounds, write the formula or chemical name:/8
a) NaCl(s)
b) Li2O(s)
c) magnesium bromide
a) sodium chloride
b) lithium oxide
c) Mg2Br (s)
What is the difference between exothermic and endothermic? Give an example of each?
In an exothermic reaction, HEAT is given off ( burning wood).
In an endothermic reaction, HEAT is absorbed ( cold pack).
What is Combustion?
A chemical reaction occurs when oxygen reacts with a substance to form a new substance and give off energy.
What is Corrosion?
slow chemical change that occurs when oxygen in the air reacts with a metal.
What is Cellular Respiration?
Chemical reaction that takes place in cells; food (sugar) reacts with oxygen to produce energy, water, and carbon dioxide.
List four pieces of evidence that a chemical reaction occurred?
a colour change
the formation of an odour
the formation of a solid or a gas
the release or absorption of heat
What are four factors can speed up a chemical reaction?
Catalysts/ enzymes
Temperature
Surface area
Concentrations
What is the Law of Conservation of Mass?
Matter is not created or destroyed in a chemical reaction; the mass of the products always equals the mass of the reactants
what is a multivalent ionic compound?
1: I 6: VI,
2: II 7: VII
3: III 8: VII
4: IV 9. XI
5: V 10: X
What are protons, electrons, neutrons, atomic number, atomic mass?
Protons: atomic number/number at the top.
Electrons: atomic number/number at the top.
Neutrons: atomic mass - the atomic number.
Atomic number: number at the top/protons/electrons.
Atomic mass: the number under element.
