Science - ch 5,6,7 study

Question 1

single displacement reaction

Answer 1

A+BC–> AC+B

Question 2

double displacement reaction

Answer 2

AB+CD–> CB+AD

Question 3

decomposition reaction

Answer 3

AB–> A+B

Question 4

synthesis reaction

Answer 4

A+B–> AB

Question 5

combustion reaction

Answer 5

A+O–> AO

Question 6

neutralization reaction

Answer 6

acid+base–> water+salt

Question 7

what is a chemical change

Answer 7

occurs when there is a new substance

Question 8

signs of chemical change

Answer 8

odur, bubbles

Question 9

signs of physical change (examples)

Answer 9

change in size, reversible

Question 10

change vs. properties

Answer 10

properties are characteristics that can be observed

Question 11

what are chemical properties

examples:

Answer 11

characteristics that can be observed during a chemical reaction

EX. density, toxicity

Question 12

what are physical properties

examples:

Answer 12

characteristics that can be observed without changing the substance

EX. colour, hardness

Question 13

ionic compounds

Answer 13

• positive and negative charges in a compound
• electrons get traded

Question 14

covalent compounds

Answer 14

• two or more negative charges in a compound
• electrons get shared

Question 15

naming binary acids

Answer 15

always H in the front of the compound

• pronounced hydro
• ends with ide

Question 16

naming oxyacids

Answer 16

contains polyatomic elements
“H” in front but does not pronounce hydro

• if the polyatomic ends with “ate” –> “ic”
• if the polyatomic ends with “ite” –> “ous”

Question 17

naming bases

Answer 17

*has hydroxide at the end of compound (OH)
*pronounced (element) hydroxide

Question 18

what are indicators

Answer 18

substances that change colour due to changes in pH value

Question 19

what is pH

Answer 19

*measures how acidic or basic a substance is. goes from 0-14
*measures how many hydrogen ions there are

pH < 7 is more basic
pH > 7 is more acidic
pH = 7 is neutral