Class test 1 – Semester 1

Section A  – Introduction to Chemistry 

ONE:

What is Chemistry? Why do we study it and how do we study it? Make sure you give me details. I am looking for the steps involved in “how we study it?” and the “general thing we do”

TWO:

What are ALL the SI units used in Chemistry and why are they important for scientific discoveries? Make sure you show what each symbol means and what it measures

THREE:

Mr. Wilkinson wants to make some toothpaste. He makes the CORRECT measurement of 250ml of Toothpaste (using 15g of baking soda). After making this he wants to change the amount of baking soda to see how much toothpaste is made. Here are the results:

– 2.5g of baking soda = 100ml toothpaste.
– 5g of baking soda = 150ml toothpaste.
– 7.5g of baking soda = 175 ml toothpaste.
– 10g of baking soda=200ml toothpaste

DRAW a GRAPH showing these measurements – include the CORRECT measurement. Marks will be given for the neatness of the graph to. Not just the “right” graph. WHY are Graphs very important for us all to be able to make and read?

FOUR:

Mr. Wilkinson asked Daniel Chinn of 11A to measure FIVE cups of 100ml of water for an experiment. Daniel measured it and got these measurements:

– 115ml
– 110ml
– 114ml
– 116ml
– 110ml

Work out (tell me) the PERCENTAGE ERROR. Then tell me why we need to know the percentage error? You should have either a + or – sign. Tell me what your sign means.

FIVE:

Convert (change) these SI units and round off these numbers. Remember – HOW MANY significant figures?

– 100KPA to PA
– 102MPA to DPA
– 50G to MG
– 10M to CM
– 10MM to KM
– 100HL to dLl

– 50G to KG
– 2.665
– 3.675
– 0.2589
– 1.752
– 9.6351
– 2.0000365

Section B  – Atoms 

ONE:

How did Democritus come to his ideas about matter? Why is this important for you? What were his 2 ideas?

TWO:

If you want to describe your friend – how do you do this? If you want to describe matter – how would you do this? Scientists describe matter using some words. What are these words? (Name two or more) Tell me what they mean? And give me two examples for each. Hint: It was in your spot quiz and second quiz. I talked about them last Monday and Tuesday.

THREE:

Tell me what each of these words mean? Why is it important to understand what an Atom is and how it works?

Isotope

Atom

Electron

Proton

Neutron

Nucleon

Orbital

FOUR:

Draw a molecule and tell me what will happen if this molecule is heated up.

 

Mid Term Exams

Section A – The WHY Questions

Question ONE (5 MARKS)

Imagine that you are a teacher. Imagine that you want to inspire a student who is not enjoying Chemistry. Imagine that you choose to write them a letter and tell them all the benefits to chemistry. Imagine that you want to tell them how great chemistry is.

Write the letter here 편지를 여기에 써라

Question TWO (3 MARKS)

Why  do we use graphs?

Why  did scientists make the periodic table?

Why  do we use SI units?

Question THREE (3 MARKS)

Why  will Fluorine want to take one electron if it comes near Lithium? Make sure you tell me  한테말해줘 ALL the reasons why. There are 3 main reasons.

Question FOUR (3 MARKS)

Why  does the atomic radius decrease from right to left of a period? Make sure you tell me  한테말해줘 ALL the reasons why.

Question FIVE (2 MARKS)

Why  was Bohr wrong in his idea of the atom? Tell me where he went wrong 그가 어디 잘못 됐는지말해봐

Question SIX (2 MARKS)

Why  are valence electrons important in Chemistry?

Question SEVEN (12 MARKS)

Tell me why these are WRONG?  잘못 되었습니까?

  • Chemistry is the study of plants.

  • The scientific method is not helpful for us.

  • Accuracy is how close together a group of measurements are.

  • Mass and flammability are physical properties.

  • Science disproves Gods existence.

  • Electrons act like particles ONLY.

  • The different isotopes of Carbon have different number of protons.

Section B – The WHAT Questions

Question EIGHT (5 MARKS)

Round these off 이것들을 반올림하다 to three significant figures AND write them in scientific notation.

  • 0.00000000184500

  • 0.0000000000012356

  • 12350000136453165.00

  • 568912000000000008921.00

Question NINE (10 MARKS)

Draw a circle around 원을 그리다 which electron configuration is correct for these elements.

  • HE

1S2

1S1

1S3

1S1 2S1

  • C

1S2 2S1 2P2

1S2 2S2 2P1

1S1 2S2 2P2

1S2 2S2 2P2

  • Ne

1S2 2S2 2P5

1S2 2S2 2P6

1S1 2S1 2P6

1S2 2S1 2P6

  • P

1S2 2S2 2P6 3S1 3P2

1S2 2S1 2P6 3S2 3P4

1S2 2S2 2P5 3S2 3P3

1S2 2S2 2P6 3S2 3P3

  • Mg

1S2 2S2 2P5 3S2

1S3 2S2 2P6 3S2

1S2 2S2 2P6 3S3

1S2 2S2 2P6 3S2

Question TEN (5 MARKS)

In a Chemistry experiment we decide to dissolve a tin can in acid. Each student needs 5.00 ml of acid to do the experiment 5 times. Mr. Wilkinson makes a mistake and gives each student these measurements. Calculate the percentage error 백분율 오차를 알아 내라 for these measurements.

1.) 4.68 ml

2.) 4.52 ml

3.) 4.98 ml

4.) 4.73 ml

5.) 4.02 ml

Question ELEVEN (5 MARKS)

Draw a graph 그래프 그리기 for the data from this experiment to show the measurements. Make sure it is NEAT and done correctly. There is ONE type of graph that is BEST for this kind of data. Make sure you use it.

Question TWELEVE (5 MARKS)

Calculate 계산하다 the number of neutrons for these elements

  • Br

  • Fe

  • Ti

  • Na

  • O

Question THIRTEEN (5 MARKS)

What are the names of 2 people who discovered facts about the atom? What did each person find?

Question FOURTEEN (5 MARKS)

Which element, X or Y, has the greatest electron affinity then Y. Circle the CORRECT answer. 원을 그리다

  • X = Cl Y = Br

  • X = Al Y = F

  • X = N Y = P

  • X = Rb Y = K

  • X = B Y = C

 

Section C – The Drawing Questions

Question FIFTEEN (4 MARKS)

In class we have spoken about many different kinds of molecules. Draw two different looking molecules. Make sure you show me the names of each elements and the name of the molecules. 그림을 그려

Question SIXTEEN (5 MARKS)

Draw the LEWIS DOT notation for these elements. Hint: Before drawing, think about WHICH electrons you must use. Use the symbol names here. 그림을 그려

 

H

 

Li

 

O

 

Ar

 

Cl

Question SEVENTEEN (4 MARKS)

The periodic table has 4 MAIN pieces of information (facts) to it. (Hint: orbital blocks is one of them).

Each of these 4 MAIN pieces of information (facts) have MORE pieces of information (facts). For example, orbital blocks tell us the kind of orbital that the last orbital is (shape).

Draw a simple picture of a periodic Table and SHOW me on it ALL 4 MAIN pieces AND the other pieces of information. Show me what happens when you move from the left to right and top to bottom of the periodic table. 그림을 그려

Question EIGHTEEN (4 MARKS)

Draw the S and P orbital below. Show the maximum number of electrons that each can hold. 그림을그려

Question NINETEEN (5 MARKS)

Draw Rutherford’s gold experiment showing how he discovered what he discovered. 그림을 그려

Question TWENTY (5 MARKS)

Draw one picture of what would happen to the orbitals if 1 Hydrogen atom came next to 1 Hydrogen atom and they made H2.

Draw another picture of what would happen to the orbitals if 1 Phosphorus atom came next to 3 Chlorine atoms and they made PCL3. You only need to draw the valence electrons, don’t worry about drawing the other electrons. 그림을 그려

Question TWENTY-ONE (3 MARKS)

Draw a picture of what happens to the radius of elements as you go up and down a group. 그림을 그려

 

Class test 2 – Semester 1

 

Section A – Calculations (6 MARKS for each = 30 MARKS).

ONE:

Calculate the density (in g/ml) of liquid A if it’s mass is 100 g and volume 0.5 L.

TWO:

Calculate the Molarity of a solution if enough water is added to 5 moles of KNO3 to make a solution of 10 L.

THREE:

Calculate the molality of a solution if 100 ml of water (density 1 g/ml) and 5 g of KI salt.

FOUR:

What is the percentage (%) mass of Carbon in sugar, if sugars formula is C12H22O11.

FIVE:

Imagine your friend cuts themselves on a tree and was bleeding. You only have NaCl salt and water. You know that NaCl salt is good to make cuts clean.

So you chose to make a homogenous solution of water and NaCl salt so that the mass % concentration is 15%. Show your calculations and explain how you would do this? You have a scale, plastic bottle, some plastic cups and a spoon.

Section B – Short answers (3 MARKS for the first, 6 MARKS for the second and 6 MARKS for the last one = 15 MARKS).

ONE:

Explain in 20 words or more the difference between covalent network solids and covalent molecular solids. Draw a picture explaining your answer. I am looking for 2 differences and a drawing.

TWO:

Explain in 20 words or more what happens when 1 electron absorbs enough energy to make it move energy levels. Six steps are necessary for this answer.

THREE:

Write about why these premises and conclusions have BAD logic to them. 1 Mark will come from the CORRECT word (E.g. Patterns). The other mark will come from the CORRECT reason why you have chosen this word.

  • My favorite K Pop star says, “Do what makes you feel good.”

  • Therefore: I do whatever makes me feel good.

  

  • My grandparents told me that the Japanese did bad things in Korea to Korean people.

  • Therefore: I can never trust a Japanese person.

  

  • Every time I go to Church I feel sick.

  • Therefore: Church makes me sick.

  

Section C – Long answers (12 MARKS for each = 36 MARKS).

ONE:

Explain in 90 words or more, including pictures, how these facts about liquids work:

  • Surface tension

  • Taste

  • Boiling

 90 words must be the TOTAL number of words for ALL 3 of these above.

 

Section D – Fill in the missing words (1 MARK for each = 29 MARKS).

ONE:

There are __________ phases on matter. One of these phases of matter we call _________________. There are, generally speaking, two differing kinds of this kind of matter______________ (name it here). One is called crystalline and the other __________. The main difference between these two is that crystalline __________ have __________ while the other kind has no order to the molecules. Crystalline __________ have four groups. They are ___________ and one property it has is: _____________, _______________ and one property it has is: ___________, _________­­­­­­_______ and one property it has is: ___________, ____________ and one property it has is: ______________.

Another phase of matter is called ___________. This phase of matter, generally speaking, has less density then the phases of matter above. This phase of matter has a greater density then another phase of matter that starts with the English letter ‘g.’This phase of matter has, roughly speaking, eleven characteristics. Ten of them are: _____________, ______________, ________________, ________________, _____________, ________________, _________________, _______________, ________________, ________________, _______________. This phase of matter can be found in three forms, pure, _____________ and _________________. Two of these are mixtures.

 

Mid year exams.

Section A – Multiple choice (circle right answer)

동그라미 

Question ONE (3 MARKS)

What is the total Pressure (Pt) of the gases in a 10 L scuba diving tank if 1 moles of O2 (oxygen) and 3 moles of He is found in the tank. The temperature is 25 degree Celsius.

 압력은 얼마입니까?

1.) 890 KPA

2.) 900 KPA

3.) 990 KPA

4.) 950 KPA

Question TWO (3 MARKS)

If the volume of a gas increases, what happens to the pressure?

압력은 어떻게 될까요?

1.) The pressure decreases

2.) The pressure increases

3.) The pressure stays the same.

Question THREE (3 MARKS)

Kinetic Molecular Theory describes… ?

1.) Real Gases.

2.) Ideal gases.

3.) Ideal gases and real gases under the right pressure and temperature.

Question FOUR (3 MARKS)

Which of these is NOT correct?

다음  올바르지 않은 것은 어느 것입니까?

1.) Liquids can freeze.

2.) All liquids have less density then solids.

3.) All liquids have surface tension.

4.) All liquids have greater density then air.

Section B – Match up the words. Write the CORRECT letter that matches the CORRECT number.

단어 맞추기.

E.g. 2.) A.

Question FIVE (2 MARKS EACH).

1.)  Saturation.2.)  Triple point.3.)  Taste.4.)  Covalent Network Solids.5.)  No order.6.)  A common Solvent used in this Chemistry course.7.)  Diffusion. 8.)  At Standard Temperature and Pressure.9.)  Bad logic.10.)                         Good logic.11.)                         Brittle.12.)                         Malleable.13.)                         Cube structure.14.)                         Grinding.15.)                         Fixed volume.16.)                         No fixed shape.17.)                         SI units.

A.) From high concentration to low concentration.

B.) 1 Mol of gas is = 22.4L.

C.) My reasoning has statements that are supported by evidence.

D.) Phase diagrams have this.

E.) Water is what we have been using.

F.) Amorphous solids have…?

G.) Trying to dissolve a solid.

H.) My reason is because I don’t like you.

I.) The reason is because of shape.

J.) No more can dissolve.

I.) NaCl salt has this quality.

J.) Grams, Kelvin and Milliliter.

K.) Co2 (dry ice – covalent molecular solid) is in a…?

L.) Gases have…

M.) Solid have…

N.) This kind of solid has very strong bonding.

O.) Iron metal has this quality.

Section C – Short answers. Answer these questions with 20 words or more + a drawing. Marks will be taken away if you use less than 20 words.

20 단어 이상으로이 질문에 답하십시오.

Question SIX (5 MARKS)

Why do gases have a lower density then solids and liquids? Make sure you use the formula for density in your answer.

Question SEVEN (5 MARKS)

Explain, in your OWN words what concentration is. What is concentration? I am NOT asking – how do we calculate concentration. Imagine I am your student and you want me to understand concentration. What IS concentration? You can use the formula for concentration in your answer.

Question EIGHT (5 MARKS)

Explain how liquids become solids? Use liquid water in your answer and a phase diagram (make it up). Talk about freezing.

Section D – Calculations. Please do NOT answer in fractions. Use your calculator to give me the answer.

계산

E.g. 0.500 NOT 1/2.

Question TEN (4 MARKS)

What is the wavelength of light given off by one electron if it drops from the N=5 to N=2 energy level.

Question ELEVEN (4 MARKS)

What is the speed of O2 (oxygen) gas if it’s temperature is 300 K?

Question TWELVE (4 MARKS)

If 2 moles of gas A has a mass of 8.006 g, Volume of 12 L and Temperature of 37.85 Degree Celsius, what is the pressure of gas A? After doing this, find out what kind of atom (element) gas A is. Hint: We use this gas in floating balloons for birthday parties. Is this gas pure or elemental?

Question THIRTEEN (4 MARKS)

What is the concentration in % volume concentration if 4.25 ml of Iodine (density 4.93 g/ml @ 293.15 K) is added into 12.5 ml of water (density 1g/ml) at 293.15 K. Please give me all your working.

Question FOURTEEN (4 MARKS)

Gas C is in a 12 L steel tank and has a temperature of 10 degree Celsius. Jason Choi wants to compress the gas. He compresses it until the pressure is 450 Kpa and the temperature is 30 degrees Celsius. What was the pressure at the start? Notice that the volume stays the same.

Question FIFTEEN (4 MARKS)

Using this graph, calculate the molality of this solution at 100 degrees Celsius. The density of water is 1 g/ml. Hint: Look on the graph to get grams of KNO3 and liters of water.

Section E – Logic.

Question FIFTEEN (2 MARK)

Logic is super important in Chemistry and in ALL life. What is it?

Question SIXTEEN (2 MARK)

Why would we want to use correct logic in Chemistry and in ALL of life?

 

Question SEVENTEEN (6 MARKS)

Write down THREE reasons that are BAD logic. Give me an example for each one. You will get 1 mark for the word and 1 marks for the example. Make sure you explain it. Write MORE then you need to. You can draw a picture if you want to (don’t have to).

불량 논리   가지 이유를 적어 .

Question EIGHTEEN (15 MARKS)

You were asked to choose ONE idea in Chemistry that we have learnt so far. You were asked to work out the correct logical premises and conclusions. You were asked to have at least four premises and to explain how each one is CORRECT then to show the conclusion. Write your work below.

 

Chemistry Class Test 1. Second Semester.

ONE – Calculation questions.

1.) Using the list of bond energies at the back of the test (you can tear that page out).

–  Calculate the HEAT of EACH reaction.

–  Show the three dimensional shapes of EACH molecule.

–  Write the correct names for EVERY molecule

–  Show if it is endothermic or exothermic.

MAKE SURE YOU BALANCE EACH REACTION.

2H2 + O2        H2O       (10 marks)

CH4 + 2O2        CO2 + H2O   (10 marks)

Br2 + F2          BrF   (10 marks)

2.) Giwon was working as a scientist. He put 1 beaker into a machine and was given this information below. He needs help to work out what substance is in the beaker. Please help him.

+ 46.7% nitrogen and 53.3% oxygen. The molecular mass of the molecular formula is 60.0 g/mol. Give Giwon the empirical formula, the molecular formula, the LEWIS DOT drawing AND the correct name of this Molecule. (8 marks).

TWO – Explain the logic of Chemistry questions.

3.) Balancing equations.

Using bullet points like this:

1.) The…

2.) The…

Show four or more logical steps that you would take in balancing this reaction. (10 marks). After doing this, explain WHY we need to balance reactions.

Ca(OH)2 + H3PO4 —> Ca3(PO4)2 + H2O

Bonus marks: Show me the full balanced reaction. (4 marks).

4.) Naming molecules.

Using bullet points like this:

1.) The…

2.) The…

Show four or more logical steps that you would take in working out the name of any molecule. You can use Ba(OH)2 in your example. (8 marks).