hi

Question 1

what is a compound

Answer 1

compounds are made up of one or more different types of atoms

Question 2

who first discovered the periodic table

Answer 2

Dmitri Mendeleev in 1869

Question 3

what are signs of a chemical change

Answer 3

color change 
odor 
gas or formation of bubbles 
change of temperature 
production of light 
change in smell or taste

Question 4

signs of a physical change

Answer 4

change in size or shape
no substance change
reversible

Question 5

what is the difference between an element and a compound

Answer 5

An element is made up of one type of atom where as compounds are made up of two or more different types of atoms .

Question 6

a colloid and suspension

Answer 6

Particles in a suspension are usually more than 1000nm , while those in a colloid range from 1 - 1000nm .

colloid example - fog suspension ex - muddy water

Question 7

whats the scientific thwory of matter

Answer 7

• All matter is made up of extremely tiny particles.
• Each pure substance has its own kind of particle, different from the particles of other pure substances.
• Particles attract each other.
• Particles are always moving.
• Particles at a higher temperature move faster on average than particles at a lower temperature.

Question 8

what are the 4 states of matter

Answer 8

gas
liquid
plasma
solid

Question 9

what is the difference between quantitative and qualititaive

Answer 9

Quantitative is the amount and qualitative is measuring something by the quality

Question 10

the smallest unit of matter that can take part in a chemical change

Answer 10

atom

Question 11

change in matter in which at least one new substance with new properties is formed

Answer 11

chemical change

Question 12

change in matter in which no new substance is formed

Answer 12

physical change

Question 13

a characteristic of a substance that can change without forming the substance

Answer 13

physcial property

Question 14

a characteristic of a substance that describes its ability to react chemically with other substances

Answer 14

chemical property

Question 15

a scientific model of the structure of matter

Answer 15

particle theory of matter

Question 16

a homogenous mixture of two or more pure substancs

Answer 16

solution

Question 17

the amount of mass in a certain unit volume of a substance

Answer 17

density

Question 18

a substance that dissolves in a solvent

Answer 18

solute

Question 19

a type of mechanical mixture in which extremely small particles of one or more substances are evenly and stably distributed in one or more others

Answer 19

colloid

Question 20

substance made of more than one kind of particle in which the particles are not uniformly scattered

Answer 20

mechanical mixture

Question 21

term applied to mixtures that are not of a uniform composition throughout

Answer 21

heterogenous

Question 22

term applied to pure substances and to mixtures that are of a uniform composition throughout

Answer 22

homogenous

Question 23

pure substance made up of one or two or more elements that are chemically combined

Answer 23

compound

Question 24

ability of a substance to burn in air

Answer 24

combustibility

Question 25

homogenous mixture of a metal with one or more metal or non metals

Answer 25

alloy

Question 26

mass

Answer 26

volume x density

Question 27

volume

Answer 27

mass over density