Definitions
Atomic theory
Elements
Chemical compounds
More terms
100
What does WHMIS stand for?
Workplace Hazardous Materials Information System
100
What is the difference between a theory and a law?
Theory = Descriptions of events or patterns. Does not involve an explanation Law= Explanations of observations supported by evidence
100
What is an element?
A pure substance that cannot be broken down into simpler components
100
What is the difference between covalent compounds and ionic compounds ?
Covalent= Atoms combine by sharing electrons to form molecules. Ionic= Atoms gain or lose electrons to form ions.
100
What is corrosion?
A chemical process by which a material is broken down.
200
What is atomic mass?
The mass of an average atom of an element.
200
How many parts does a atom have?!
Three parts= Protons which is in the nucleus, Electrons which are outside the nucleus, Neutron which are in the nucleus.
200
What are the symbols for sodium,potassium,iron and zinc?
Sodium=Na, Potassium=K, Iron=Fe, Zinc=Zn
200
What is the chemical formula for table salt and sodium hydroxide?
Table salt= NaCl , Sodium hydroxide= NaOH
200
What is a metalloid?
An element that shares some properties with metals and some properties with non-metals.
300
What is a chemical family?
Groups of elements arranged in vertical columns in the periodic table that have similar physical and chemical properties.
300
What did the early Greeks believe matter was composed of?
Earth, Air, Fire, Water.
300
What is atomic number?
The number of protons in each atom of an element.
300
What is a chemical change?
A change in matter in which chemical bonds are formed and broken and at least one new substance is produced.
300
What is the electron shells?
Regions that surround the nucleus of an atom and contain electrons
400
What is a molecule?
A group of atoms in which the the atoms are held together by the sharing of one or more pairs of electrons.
400
What was jj Thomson's atomic theory ?!
Atoms are composed of small particles. Atoms contain negatively charged particles called electrons. He made a raisin bun model.
400
What are some properties of noble gases?
Very stable and unreactive. Colourless, odourless gases. Some glow Indistinctive colours.
400
What are some physical changes that occur ?
Change of state , Cutting , Dissolving
400
What is a period?
Horizontal row in the periodic table.
500
What is a physical change?
A change in matter in which the appearance may change but no chemical bonds are broken or made and no new substance is formed.
500
What was Ernest Rutherford atomic theory?
Discovered the nucleus of the atom. Established that the nucleus had 2 types of particles proton and neutron.
500
What side of the periodic table is the non-metals on?
The right side!!
500
What is some evidence that a chemical change has happened?!
Heat/light is produced, New colour appears, Precipitate forms, Gas is produced, Process is difficult to reverse
500
What is combustibility?
The degree to which a substance will burn
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