chem study guide

Question 1

What does WHMIS stand for

Answer 1

workplace hazardous materials information system

Question 2

endothermic vs exothermic. differeencee?

Answer 2

endo: needs heat exo: releases heat

Question 3

reactants vs products. what are they

Answer 3

reactants go into a reaction, products are made from a reaction

Question 4

list thee factors that affect rr (reaction ractes)

Answer 4

temp, stirring, surface area, concentration, catalysts and inhabitors

Question 5

element vs compound

Answer 5

element is 1 pure substance, compound is 2 or more pure substances

Question 6

particle model of matter

Answer 6

particles are always moving

Question 7

difference between chemical and physical changes

Answer 7

chemical is irreversible, and creates something new. physical only has a change of state

Question 8

five signs of chemical change

Answer 8

bubbles, temp, colour, odour, percipitate

Question 9

law of conservation of mass?

Answer 9

matter cannot be destroyed or created, number’s will always stay the same

Question 10

closed vs open system

Answer 10

closed: no matter/energy can get in open: can exchange energy from outside

Question 11

who organized the first periodic table

Answer 11

pmtri mendeleev

Question 12

inhibiter vs catalyst

Answer 12

inhibiter: slows down a reaction catalyst: speeds up a reaction

Question 13

is combustion exo or endothermic

Answer 13

exo