Chapter 8- Material Changes chapter 9- The earth

Question 1

What are acids and alkalis

Answer 1

Liquids

Question 2

What is an indicator

Answer 2

A liquid which produces a particular color if it is mixed with an acid or an alkali

Question 3

Study the indicator acid and alkali table in your photos

Answer 3

How well did u know it

Question 4

There are two types of litmus paper then which one is used for acid and which one is used for alkalis

Answer 4

Blue is for acids, red is for alkalis

Question 5

What’s the letters P & H stand for

Answer 5

Power of hydrogens

Question 6

What is hydrogen found in? and what does it do in what it is found in

Answer 6

Acids,I played as an active part in the chemical reactions

Question 7

Describe what the letters on the pH scale Stand for

Answer 7

0-2 strong acids
3-6 weak acid 
7- neutral 
8-11 weak alkali
12-14 strong alkali

Question 8

Study the diagram in your camera roll on the pH scale

Answer 8

How well did you know it

Question 9

When does neutralization occur

Answer 9

We are in an accident alkali take part in a chemical reaction, salt is formed

Question 10

What is the general word equation for naturalization

Answer 10

Acid+alkali —> salt+water

Question 11

Go look in your photos and memorize some basic word equations

Answer 11

How old did you know them

Question 12

What is added to soil To neutralize it’s acidity

Answer 12

Calcium hydroxide

Question 13

What does sodium hydrogen carbonate dissolve into water to produce

Answer 13

An alkaline solution look at this word equation in your phone

Question 14

What is used in indigestion tablets when there is too much acid in the stomach

Answer 14

Sodium hydrogen carbonate

Question 15

What are a few things sodium hydrogen carbonate is used in

Answer 15

Baking powder, fire extinguishers, indigestion tablets

Question 16

What type of chemical reactions take in heat?

Answer 16

Endothermic reactions

Question 17

What chemical reactions give out heat

Answer 17

Exothermic reactions

Question 18

When a chemical reaction is not useful

Answer 18

When oxygen reacts with oils and food and makes them smell bad, it can make metals weaker, call dust and flour mix with oxygen in the end become hot they can cause explosions

Question 19

Describe the endothermic reaction burning

Answer 19

A substance burns it reacts with oxygen in the air this reaction releases heat. Fuel’s such as wood, coal, oil and natural gas are burnt to provide heat for cooking, warming houses and making steam in power stations to generate electricity, carbon dioxide and water are produced when fuels are burnt

Question 20

Explain the Exothermic reaction respiration

Answer 20

Expiration is the process in which energy is released from food. It takes place in the bodies of all living things. The word equation is glucose plus oxygen —>Carbon dioxide plus water
The energy is used for making substances needed in the body for growth and in animals it is used by muscles to allow movement

Question 21

Explain the endothermic reaction rusting

Answer 21

When iron and oxygen react In an oxidation process to produce rest, heat is given out. In hand warmers this heat is held by a bag which can be used to warm the body

Question 22

Different metals react at different speeds when they react with…

Answer 22

Other chemicals

Question 23

What happens when oxygen is heated with sodium

Answer 23

It bursts into flames and burns quickly to form a white powder

Question 24

What happens when I and is heated with oxygen?

Answer 24

Small particles glow and produce yellow sparks

Question 25

What happens when copper is heated oxygen

Answer 25

Does not glow or burst into flame but forms a black powder

Question 26

What happens when gold is heated with oxygen

Answer 26

It does not change

Question 27

What happens when potassium reacts with water

Answer 27

Flights but in bursts into Flame, hydrogen is produced in potassium hydroxide solution is formed

Question 28

What happens when sodium reacts with water

Answer 28

It floats and fizzes , Hydrogen is produced and sodium hydroxide solution is formed

Question 29

What happens when calcium reacts with water

Answer 29

It shrinks and produces bubbles of hydrogen informs calcium hydroxide solution

Question 30

What happens when magnesium, zinc and iron reacts with water?

Answer 30

They do not react with water

Question 31

What is formed when magnesium, zinc and iron react with steam

Answer 31

They produce metal oxide and hydrogen

Question 32

What does copper not react with

Answer 32

Water or steam

Question 33

Go look in your photos for the reactivity series table

Answer 33

How well did you know it

Question 34

Look in your photos and study comparing a salt from a metal and an acid

Answer 34

How old did you know this explain to me what you just learned

Question 35

Go look at the diagram in your camera roll of measuring rates of reactions

Answer 35

Study this for a while and explain to me what you just learned

Question 36

What is the concentration of a liquid reactant

Answer 36

It is a measurement of how much solute Is dissolved in it

Question 37

What does the higher concentrations increase

Answer 37

The rate of reaction the Opposite happens with the lower concentrations

Question 38

How does breaking particles into Smaller particles Increase the rate of reaction

Answer 38

Oh breaking particles into further small particles you increase the surface area and by increasing the surface area with a reaction takes place, you Increase the rate of reaction

Question 39

What does raising the temperature of the reactants due to the reaction

Answer 39

It speeds it up

Question 40

What is some evidence that raising the temperature of the Reactants speeds up the rate of reaction

Answer 40

When you mix hydrochloric acid and sodium thiosulfate, And time how long it takes for Sophie💛 to develop the liquid sufficient to block the view of a cross at the base of the flask

Question 41

What is a catalyst

Answer 41

A catalyst is a substance that speeds up the rate of reaction but does not change itself

Question 42

You’re a need a small mount of catalyst to…

Answer 42

Increase the reaction rate

Question 43

How many reactions can a catalyst speed up

Answer 43

One, it cannot speed up a number of different reactions

Question 44

What is the catalyst manganese Dioxide used speed up

Answer 44

The rate at which hydrogen Peroxide breaks down oxygen and water

Question 45

Go look at the earth and earth structure diagram in your photos and study yet

Answer 45

Describe to me the placement of The crust, mantle, outer core, and a core

Question 46

Go spend time studying the table on rock types

Answer 46

What rock type is granite, chalk, marble

Question 47

Go study the soil table in your photos

Answer 47

What soil type is clay with some humans, How well does Sandy soil drain, how good is the air content in loam

Question 48

What are fossils

Answer 48

Fossils are formed to the bodies of ancient plants and animals that are quickly covered by sand or mud

Question 49

What Prevents animals from Decaying

Answer 49

Sand and mud

Question 50

Describe replacement I’m talking about fossils

Answer 50

Replacement, the body tissue dissolve and I washed away to be replaced with minerals that come out of water and make a perfect rocky shape of the body

Question 51

Describe to me petrification In terms of fossils

Answer 51

Minerals in the water passing through the fossil settle in tissues and turn them into rock

Question 52

Describe to me what weathering is

Answer 52

Rocks break down the process of weathering and the tiny fragments are washed away and deposited In layers, often it mouths of rivers

Question 53

What are two types of rocks are often build up on each other

Answer 53

Lime stone in Sandstone

Question 54

What is the show that the earth is very old

Answer 54

Different layers of rocks can have different groups of fossils of organismsThat lived in different habitats, such as swamps in deserts. This shows that during the time differently as well laid out, the climate changed. Up until now this has been a very slow process, again hinting that the earth is very old

Question 55

How was the age of the rock found

Answer 55

Age of the rock is found by studying the amount of radioactive elements it contains

Question 56

What is a radioactive element

Answer 56

Radioactive element is one that breaks down or decays two from other elements. Radioactive elements DK at a regular rate, with some taking thousands or even millions of years it OK to half original mass

Question 57

Definite age of a rock be found

Answer 57

A definite age of a rock can be found by comparing the amount of radioactive elements in it with the amounts of elements they have have

Question 58

How old is the earth estimated to be

Answer 58

4.6 billion years