Chemistry

Question 1

What type of equation is this;

NaCl+AgNO3-MgCl2+H2

Answer 1

Double

Question 2

What type of equation is this;

Cl2+NaBr-NaCl+Br2

Answer 2

single replacement

Question 3

What type of equation is this;

H+N-HN

Answer 3

Synthesis

Question 4

What is a chemical change?

Answer 4

a change on which a reaction between the atoms or molecules must take place

Question 5

Heat causes an object to __________

Answer 5

expand

Question 6

SKIP List the labels of the periodic table, left to right.

Answer 6

alkali metals
alkaline earth metals
transition
boron family
carbon
nitrogen
oxygen
halogens
noble gasses
lanthanoid
actinoid

Question 7

What type of equation is this;

HgO-Hg+O

Answer 7

decomposition

Question 8

define exothermic

Answer 8

exothermic is a type of evidence, in the category heat given off or removed, and is characterized by heat being given off.

Question 9

define endothermic

Answer 9

endothermic is a type of evidence, in the category heat given off or removed, and is characterized by heat being removed

Question 10

list the different types of evidence for chemical reactions

Answer 10

• heat given off or removed
• precipitate
• color change
• gas production
• new substance with different properties

Question 11

are the following chemical or physical changes:

1. zinc is added to vinegar
2. wooden splint is broken in half
3. benedicts solution is added to corn syrup and heated
4. seltzer tablet is crushed
5. crushed seltzer is added to water
6. hydrochloric acid, baking soda, and phenolphthalein are mixed
7. new substance appears
8. digesting a candy bar
9. dissolving cool-aid in water
10. dew on grass in the morning
11. chemical reaction occurs and something bubbles
12. substance changes state or phase

Answer 11

1. chemical
2. physical
3. chemical
4. physical
5. chemical
6. chemical
7. chemical
8. chemical
9. physical
10. physical
11. chemical
12. physical

Question 12

is the carbon cycle a chemical or physical change?

Answer 12

chemical, (photosynthesis and respiration are chemical changes because CO^2 is broken down to make sugar during photosynthesis and during respiration it is released)

Question 13

define chemical change?

Answer 13

the product is noticeable/visually modified product no new substance is formed

Question 14

define physical change?

Answer 14

a new substance is formed and can not be reversed

Question 15

define the law of conservation of matter

Answer 15

no matter how many reactants and products in a chemical reaction, all of atoms present at beginning of the reaction will remain at the end, meaning the total mass stays the same. matter is neither created nor destroyed.

Question 16

give definition, properties, and examples about mixtures

Answer 16

definition: two or more substances that are together in the same place but not chemically combined.
properties: each substance keeps individual properties
examples: soil, ocean water, drink mix,

Question 17

define homogenous

Answer 17

well mixed, can’t see different parts. often called a solution - a solution is the best mixed of all possible mixtures
examples: pure and salt water, iron, hydrogen

Question 18

define heterogenous

Answer 18

can see separate parts, not completely mixed.

examples: salad, trail mix, a pencil

Question 19

compound or mixture:

1. air
2. powdered drink mix
3. paper
4. sugar
5. carbon dioxide
6. calcium carbonate

Answer 19

1. mixture
2. mixture
3. mixture
4. compound
5. compound
6. compound

Question 20

you can separate mixtures by using…

Answer 20

magnetism, hand seperation, filtration, sifting, extraction and evaporation, chromatography

Question 21

what does the indicator of red litmus do?

Answer 21

red litmus and basic substances turn the paper blue

Question 22

what does the indicator of blue litmus do?

Answer 22

blue litmus and acidic substances turn paper red

Question 23

what does the indicator of bromthymol do?

Answer 23

acid: orange
neutral: blue
base: dark blue

Question 24

what does the indicator of phenolphthalein do?

Answer 24

acid: nothing
neutral: pink
base: dark pink

Question 25

what do acids and bases taste like?

Answer 25

acids: sour bases: bitter

Question 26

how do acids and bases react with the metals magnesium, zinc, and iron?

Answer 26

acids: produce hydrogen gas bases: doesn't

Question 27

how does it react with carbonates?

Answer 27

acids: a gas forms bases: doesn't

Question 28

what is an indicator?

Answer 28

helps to determine substances such as litmus

Question 29

do acids conduct electricity?

Answer 29

- react with metals and conduct electricity

Question 30

bases are slippery.

Answer 30

i hope you knew that.

Question 31

what are compounds?

Answer 31

definition: A compound is a pure substance formed when two or more chemical elements are chemically bonded together. The type of bonds holding elements together in a compound can vary: two common types are covalent bonds and ionic bonds. The elements in any compound are always present in fixed ratios.

Question 32

what is an element?

Answer 32

a pure substance that cannot be broken down into any other substances by chemical or physical means.

Question 33

Sb, atomic number 51, atomic mass 121.75. find protons, neutrons and electrons

Answer 33

protons: 51 electrons: 51 neutrons: 71

Question 34

why do metals have the tendency to be conductors of electricity

Answer 34

this is because they usually want to lose electrons from their outer shell.

Question 35

all elements want to gain lose or share electrons so that they become stable. they do the by chemical reaction.

Answer 35

i hope you know that. or your dumb. get a life.

Question 36

after heating....

Answer 36

molecules expand

Question 37

when cooled...

Answer 37

molecules condense

Question 38

define solids.

Answer 38

- particles are very close together - definite volume and shape - particles move slowly

Question 39

define liquids.

Answer 39

- particles are relatively close together - take shape of container - has fixed volume - move at medium speed bouncing off of one another

Question 40

define gasses.

Answer 40

- hard to contain with no shape - no volume - lots of space between particles and move very quickly

Question 41

``` solid to gas gas to liquid liquid to solid solid to liquid liquid to gas gas never goes to solid ```

Answer 41

``` cools, sublimation condenses freezes warms and melts boils and evaporates ```

Question 42

the measurement of how fast molecules are moving is called...

Answer 42

temperature

Question 43

who made the bohr model?

Answer 43

niel bohr in 1913

Question 44

how many electrons in each shell?

Answer 44

``` 1st - 2 2nd- 8 3rd- 18 4th-32 5th-50 *the electrons never touch, they repel each other* ```

Question 45

define chemical symbol

Answer 45

the symbol for the element, always an uppercase first letter and if a second letter, than its lowercase

Question 46

define atomic number

Answer 46

aka prion number, is the number of protons (and electrons) found in the nucleus

Question 47

amu

Answer 47

atomic mass unit

Question 48

do groups goes horizontal or vertical

Answer 48

horizontal

Question 49

how many groups are there

Answer 49

18

Question 50

how many periods are there

Answer 50

7

Question 51

elements found on the zig zag line

Answer 51

metal lloyds

Question 52

metal lloyds have....

Answer 52

both metal and non metal properties

Question 53

list three properties of metals

Answer 53

- shiny - melleable - reactive - ductile - conductive - magnetism

Question 54

list three properties of non metals

Answer 54

- insulators - very reactive - dull - brittle - no ductile

Question 55

what is the charge and location and amu of the proton

Answer 55

located - nucleus charge- positive amu- 1

Question 56

what is the charge and location and amu of the neutron

Answer 56

located - nucleus charge- neutral amu- 1

Question 57

what is the charge and location and amu of the electron

Answer 57

located- electron cloud charge- negative amu- about 0

Question 58

what is the charge and location and amu of the nucleus

Answer 58

located- center of the atom | charge- positive

Question 59

group 1 and 2 are....

Answer 59

highly reactive non metals

Question 60

group 13-17 divided by the stair case/zig zag are...

Answer 60

less reactive metals

Question 61

group 18 are....

Answer 61

non reactive non metals

Question 62

list three examples of indicators

Answer 62

- ph paper - bromthymol blue - phenolphyhlein - litmus paper