singe displacement reaction worksheet

singe displacement reaction worksheet

Pattern of Reactivity   12:13

complete this reactions. then convert into word equations
1.Ag + KNO3 →      
2. Zn + AgNO3 →      
3. Cl2 + KI →      
4. Cu + FeSO4 →      
5. Fe + Pb(NO3)2 →      
6. Cu + Al2(SO4)3 →      
7. Al + Pb(NO3)2        
8. Cl2 + NaI →      
9. Fe + AgC2H3O2      
10. Al + CuCl2 →        
11. Br2 + CaI2 →        
12. Fe + CuSO4 →        
13. Cl2 + MgI2 →        

IGCSE Sound worksheet

IGCSE Sound worksheet

Sound   10:16

IGCSE2  Sound Worksheet

11.  State true or false for each of the following statement

a.       Sound travels the fastest in solids and slowest in air.

b.      Sound can travel in vacuum

c.       The speed of sound is    3 x 10⁸ m/s

d.      The speed of sound is a constant.

e.      Sound can travel from the Sun to the Earth.

f.        Pitch means how loud a sound is.

22.  What is the meaning of compression and rarefaction in term of vibration of sound waves?

33.  Delia ties a silver spoon to a piece of string and holds the ends to her ears.

When her friend Donny, strikes the spoon with a pencil, Delia hears a sound like a bell.

Explain the reason for this.

44. Explain why we do not hear explosions on the Sun, although they must be very loud.

55.   A musical instrument produces a sound wave with a frequency of 1000 Hz.  The sound wave  has a wavelength of 0.34 m in air.  Calculate the speed of the sound wave in air.

66.  In water the speed of sound is different.  The speed of a sound wave in water is 1300 m/s. The sound wave has a frequency of 1000Hz.  Calculate the wavelength of this sound wave.

77.  The diagram shows a ship using an Echo locator (SONAR) to find a shoal of fish.  The pulsed wave is transmitted from the ship, which is then reflected off the top of the shoal and is then picked up by the receiver.

 

A ship sending sound signals to the sea receives the echo 2 s later. If sound travels a t 1400 m/s in sea water, how deep is the sea?

88.  A student sits in the middle of a rectangular hall is 17 m wide, as shown in the diagram below. When student bangsna drum, two echos are heared, 0.05 s and 0.08 s respectively, after the bang.

 Assuming that there is no echo from the ceiling, calculate:

(i)      The speed os sound in the air

(ii)    The length of the hall

Pattern of Reactivity Quiz

Pattern of Reactivity Quiz

Pattern of Reactivity   09:30

REACTIVITY SERIES - Chem is try  2

Workout these questions with your learning partner. There are 40 marks possibly.

1)      Answer the following questions in full sentences.

a)     Why does gold occur native (uncombined) whereas zinc does not?

………………………………………………………………………………………………

b)     Why was silver used to make coins in the past?

………………………………………………………………………………………………

c)      Why is copper used to make electrical cables and wires?

………………………………………………………………………………………………

 (3)

  2)      The following metals are listed in order of reactivity (most reactive first)

sodium  >  magnesium  >  zinc  >  copper

a)     Describe what each metal does when

(i)    heated in air  …………………………………………………………..

(ii)  added to dilute hydrochloric acid……………………………………..

b)     Which of the four metals would be suitable for making saucepans?  Explain why the others are not.

………………………………………………………………………………………………

………………………………………………………………………………………………

(5)

3)     Describe what you would see if you dropped a piece of magnesium ribbon into some copper sulphate solution in a test tube.  Write a word equation for the reaction.

………………………………………………………………………………………………

……………………………………………………………………………………………...

………………………………………………………………………………………………

………………………………………………………………………………………………

(3)

4)     Complete the following word equations.

a)     zinc   +   lead nitrate solution  ………………………………………………………….

b)     iron   +   zinc sulphate solution  ………………………………………………………..

c)      lead   +   copper nitrate solution ………………………………………………………

d)     magnesium   +   zinc chloride solution  ………………………………………………..

e)     copper   +   sodium chloride solution  …………………………………………………

f)       zinc   +   iron sulphate solution  ………………………………………………………..

g)     gold   +   silver nitrate solution  ………………………………………………………..

h)     magnesium   +  calcium nitrate solution  ……………………………………………..

(8)

5)     Three metals X, Y and Z have the following reactions:-

Y will displace X from a solution of its salt.

Z will displace both X and Y from solutions of their salts.

Place the three metals in order of reactivity, starting with the least reactive.

………………………………………………………………………………………………

(2)

6)     Here is a list of metals in order of decreasing reactivity.  Q and R are mystery metals.

K > Q > Ca > Mg > Al > Zn > R > Fe > Cu

a)     Will Q react with cold water?                                                              …………

b)     Will R react with cold water?                                                                              …………

c)      Will R react with dilute hydrochloric acid?                                 ...……….

d)     Will R displace copper from copper sulphate solution?    ...……….

e)     Write word equations for any reactions in parts a) to d)

………………………………………………………………………………………………….

………………………………………………………………………………………………….

………………………………………………………………………………………………….

………………………………………………………………………………………………….

(6)

7)     Describe everything you see when sodium is added to water containing universal indicator.

Name the two chemical products of sodium reacting with water and give the symbol equation for the reaction of sodium with water.

(3)

8)     (a) Give two observations that could be made after adding zinc to copper(II) sulphate solution.

(b) Give the symbol equation for the reaction between zinc and copper(II) sulphate solution.

(4)

(c) explain why this is an example of a displacement reaction.

  9   (a) Give three observations that could be made when magnesium reacts with sulphuric acid.
     (b) Give the word and symbol equation for zinc reacting with sulphuric acid.
     (c) From copper, iron, magnesium and zinc: Which reacts with acid (i) fastest?, (ii)slowest?

(6)

Alkanes Alkenes worksheet

Alkanes Alkenes worksheet

IGCSE Chemistry   10:54

WORKSHEETS
Worksheet 1 : Carbon Compound

1. Carbon compounds are compounds which contain ………………
2. Hydrocarbons are the simplest organic compounds containing …………….. and  …………….atoms  only. Some organic compounds  also contain other element such as oxygen, nitrogen and halogens ; the compounds are called ………………….
3. Saturated hydrocarbons contain entirely of carbon-carbon ……………….. bonds. Unsaturated hydrocarbons contain at least one carbon-carbon ……………… bond or carbon-carbon triple bonds.
4. The molecular formula is a chemical formula that shows the…………………………. of each element present in one molecule of the substance.
5. The structural formula  of an organic compound is the formula that shows  the ……………………………….. and the covalent bonds between atom in a molecule of the compound.
6. A ……………………series is a family of organic compounds with each member of the family differing from the previous member by having one more group of atoms –CH2 .  All members in the same family have the same  functional group and with similar …………………… properties.
7. A functional group is an atom or a group of atoms that determine the ……........ properties of an organic compound.
8. ……………………. are compounds which have the same molecular formula but

            different structural formula. The phenomenon whereby two or more molecules have the
            similar molecular formula but different structural formula is called ………………

As Level Chemistry-chemical equilibrium

As Level Chemistry-chemical equilibrium

Chemistry   09:27

Worksheet A            Equilibrium Calculations
            Solve each problem and show all of your work.
1.         SO3(g)         +     H2O(g)                ⇄    H2SO4(l)        
            At equilibrium [SO3] = 0.400M             [H2O] = 0.480M                  [H2SO4] = 0.600M            
            Calculate the value of the equilibrium constant.
 2.         At equilibrium at 100oC, a 2.0L flask contains:
            0.075 mol of PCl5             0.050 mol of H2O               0.750 mol 0f HCl           0.500 mol of POCl3
            Calculate the Keq for the reaction:
            PCl5 (s) + H2O (g) ⇄ 2HCl (g) + POCl3 (g)
3.         Keq= 798 at 25oC for the reaction:  2SO2 (g)   +  O2 (g) ⇄  2SO3 (g).
            In a particular mixture at equilibrium, [SO2]= 4.20 M and [SO3]=11.0M. Calculate the equilibrium [O2] in this mixture at 25oC.
4.         Consider the following equilibrium:
            2SO2 (g) + O2 (g) ⇄ 2SO3 (g)
            0.600 moles of SO2 and 0.600 moles of O2 are present in a 4.00 L flask at equilibrium at 100oC. If the Keq = 680, calculate the SO3 concentration at 100oC.
5.         Consider the following equilibrium:
            2 NO2(g)           ⇄        N2O4(g)
            2.00 moles of NO2 and1.60 moles of N2O4 are present in a 4.00 L flask at equilibrium at 20oC. Calculate the Keq at 20oC .
6.         2 SO3(g)           ⇄        2 SO2(g)           +          O2(g)
            4.00 moles of SO2 and 5.00 moles O2 are present in a 2.00 L container at 100oC and are at equilibrium. Calculate the equilibrium concentration    of SO3 and the number of moles SO3 present if the Keq = 1.47  x  10-3.
7.         If  at equilibrium [H2] = 0.200M and [I2] = 0.200M and Keq=55.6 at 250oC, calculate the equilibrium concentration of HI.
            H2 (g) + I2 (g) ⇄ 2HI (g)
8.         1.60 moles CO, 1.60 moles H2O, 4.00 moles CO2, 4.00moles H2 are found in a 8.00L container at 690oC at equilibrium.
            CO (g) + H2O (g) ⇄ CO2 (g) + H2 (g)
            Calculate the value of the equilibrium constant.

REACTIVITY SERIES worksheet

REACTIVITY SERIES worksheet

Pattern of Reactivity   15:36

Workout these questions below.

Name                   : ______________________________              Marks   :

Date                      : ______________________________

 

1.    Katie and Nando have identical new bicycle. Katie lives in a dry, cool, grassland area and Nando lives in warm, wet region on the coast. Which bicycle may show signs of rusting first? Explain your answer.

2.    What is the relationship between rusting of metals and their reactivity?

3.    Iron, Aluminum, Lead, Copper, Tin, Zinc, Magnesium. Which of these element will rust first and which is the last?

Arrange the elements according to the reactivity. (most reactive to less reactive)

4.    Suggest the statement below:

a.         The roof of the house are potassium plate

b.         We can protect the fence in the yard by painting

Safety in The Laboratory worksheet

Safety in The Laboratory worksheet

Laboratory Apparatus and Techniques   14:51

Look at the picture below.

What Are They Doing Wrong??

List what are they doing wrong in the picture below.

Scientific Methods Worksheet

Scientific Methods Worksheet

Scientific Methods   10:07

Scientific Method Worksheet

Name :

Class/# :

Day, date :

Step 1: Put the steps of the scientific method in the correct order.

Do background research

Ask a question

Analyze results

Construct a hypothesis

Draw conclusions

Test with an experiment

Step 2: Using the below synopsis, match each of the steps of the scientific method to its corresponding statement.

Synopsis: Jenny has been working hard all summer on her tomato garden. Recently, she noticed that

insects have been eating her tomatoes and tomato plants and she is worried about spraying them with harmful, store-bought pesticides.

Jenny states that if she sprays her vegetables with a natural, homemade solution to help fight

the bug problem, then her vegetables will still grow to the same size as they would if she used

store bought pesticides____________________________

Jenny sprays one third of her vegetables with store bought pesticides , one third of her vegetables with her homemade solution, and does not spray the remaining third (her control group) ____________________________

After one week, Jenny compares and tests the differences in her vegetables____________________________

Jenny wonders how she can protect her plants from bugs without harming the

vegetables____________________________

Jenny determines that her homemade solution was just as effective as the store-bought

pesticides____________________________

Jenny goes to the library and looks up different kind of pesticides and their effect on vegetables and also looks up natural remedies to help solve her bug problem____________________________

Identify the independent variable and the dependent variable.

1. Christine investigated how fast one year old Persian cats reacted to different whistles.

Independent Variable ______________________________________________

Dependent Variable _______________________________________________

2. Identify the independent variable, dependent variable, and constants.

Mario studied how far room temperature tap water would spurt out of a plastic milk carton when 3 mm holes were punched at different heights from the bottom of the container.

Independent Variable ______________________________________________

Dependent Variable _______________________________________________

Constants _______________________________________________________

________________________________________________________________

3. Identify the independent variable and dependent variable in each hypothesis.

a. If different motor oils are put in water, then they will float at different heights on the water.

Independent Variable________________________________________

Dependent Variable __________________________________________

b. If the number of twists of a rubber band is increased, then a toy propeller airplane will fly farther.

Independent Variable ________________________________________

Dependent Variable __________________________________________

4. Determine if the hypothesis is supported by the data and explain your answer.

Lamont knew that water made things look larger. He wondered what other liquids such as alcohol and glycerin would do. Lamont thought a pencil would look larger in the thicker liquid (glycerin), followed by water, and then alcohol. In the experiment he rated the increase in pencil size from 1 to 10, with 10 as the largest. His rankings were 7 for glycerin, 5 for water, and 2 for alcohol.

________________________________________________________________

________________________________________________________________

________________________________________________________________

________________________________________________________________

5. Make a hypothesis about the following using an “If . . . , then . . . “ statement.

a. The time for different size water drops to fall through vegetable oil.

_________________________________________________________

_________________________________________________________

_________________________________________________________

b. How high an ice cube will float in different temperatures of water.

_________________________________________________________

_________________________________________________________

_________________________________________________________