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Flashcards in Science Tri 2 Deck (47):
1

What is an atom?

The smallest unit of an element that has the properties of that element
small particles that make up elements and compounds

2

What is a molecule?

Two or more atoms joined/bonded together

3

What is a compound?

A chemical combination of two or more elements
two or more different types of atoms bonded together

4

How many atoms in this formula?
Ba(OH)2

5

5

How many atoms in this formula?
NH4)3 PO4

20

6

How many atoms in this formula?
Mg(C2 H3 O2)2

15

7

How many atoms in this formula?
Mg(NO3)2

9

8

What is a covalent bond?

sharing of a pair of electrons between two atoms
between 2 nonmetals

9

What is an ionic bond?

transfer of electrons to create irons (charged particles)
between metal and nonmetal

10

How do ions become charged?

Alternating + or - atoms --> ions (charged particles)

11

What happens if ions lose electrons?

When they lose electrons, they become positively charged and are named cations.

12

What happens if ions gain electrons?

When they gain electrons, they are negatively charged and are named anions.

13

What are colloids?

particles mixed but NOT dissolved
one substance dispersed through a second substance.
ex: mayo

14

What is emulsion?

dispersion of one liquid in another liquid

ex: nesquik in milk

15

What is dispersion?

distribution of a substance in a gas or liquid

ex: spray air fresheners into air

16

What is a suspension?

particles have to be shaken to keep mixed
a heterogeneous mixture in which moderate sized particles are suspended in a liquid or gas where they are supported by buoyancy

ex: snow globe

17

What is a heterogeneous mixture?

I can see the parts

18

What is a homogeneous mixture?

"same"-throughout

19

What is a solution?

uniformed composition throughout- well mixed and the particles are very small of dissolved
A mixture in which a solid and a liquid or two liquids are mixed so evenly that it is impossible to see the separate particles

ex: water

20

What is a solvent?

the substance being dissolved

21

What is a solute?

what the substance is being dissolved in

22

What is filtration?

separates a solid that can dissolve from one that can't

23

What is evaporation?

separates a liquid and solid by boiling off the liquid

24

What is distillation?

separates liquids with different boiling points

25

What is a chemical reaction?

A process that changed substances into new substances

*reacts

26

What is a physical reaction?

A change in matter that does not affect its chemical composition?

*dissolved

27

What is a chemical property?

indicates how a substance reacts with something else

matter will be changed into a new substance after the reaction

28

What is a physical property?

observed with senses

determined without destroying matter

29

Balancing equations

CH4 + O2 --> CO2 + H2O

CH4 + 2 O2 --> CO2 + 2 H2O

30

Balancing equations

KL + Pb(NO3)2 --> KNO3 + PbI2

2KL + Pb(NO3)2 --> 2KNO3 + PbI2

31

Balancing equations

KL + Pb(NO3)2 --> KNO3 + PbI2

2KL + Pb(NO3)2 --> 2KNO3 + PbI2

32

Balancing equations

CaSO4 + AlBr3 --> CaBr + Al2(SO4)3

3 CaSO4 + 2 AlBr3 --> 3 CaBr + Al2(SO4)3

33

What does the Law of Conservation state?

Mass cannot be created or destroyed by ordinary means in a chemical reaction. Matter cannot lose or gain mass even if it changes form.

34

What do we do to equations that demonstrates the Law of Conversation of Mass?

Balance them

35

What is an exothermic reaction?

heat energy is released

36

What is an endothermic reaction?

heat energy is absorbed

37

What is a synthesis reaction?

2 reactants create 1 product

38

What is decomposition?

1 reactant breaks down into 2 or more products

39

What is single replacement?

1 element replaces another
(cutting in the dance)

40

What is double replacement?

2 compounds react to form 2 new compounds
(both partners switch)

41

What reaction is this?

MgCl2 + Li2CO3 --> MgCO3 + LiCl

Double

42

What reaction is this?

2AgNO3 + Cu --> Cu(NO3)2 + 2AG

Single

43

What reaction is this?

2NO2 --> 2 O2 + N2

Decomposition

44

What reaction is this?

2 NH3 + H2SO4 --> (NH4)2 SO4

Synthesis

45

Magnetism

a physical phenomenon produced by the motion of electric charge, resulting in attractive and repulsive forces between objects.

46

How to tell if a compound is an acid?

Starts with H

47

How to tell if compound is a base?

Ends with OH