Make a test on the topic of complex substances chemistry. Tasks for dessert

generalize knowledge on the topic “Simple and complex substances”;
formation of communicative abilities of students when working in groups.

Equipment:

Tablets with a menu for each table - 4 pcs.;
Card for assessing the contribution of the student to the work of the group;
Description of tasks (on the menu) for students for each table - 4 pcs.
Credit in the amount of 40 c.u.
PSCE and solubility table.

The students visit the cafe. 3 groups of 4 people are formed, each group chooses a responsible (administrator) of the table. During the game, the work of each group is evaluated both by the teacher and classmates (opponents).

In the menu, instead of the usual dishes, tasks on the topic are presented. Each group was given a credit in the amount of 40 USD. When solving tasks, students receive an assessment in c.u.

Evaluation of students' activities is carried out according to the scheme:

“excellent” - 1 c.u., “good” - 2 c.u.; “satisfactory” - 3 c.u.

Quantity received c.u. deducted from this loan. The winner is the group with the highest amount.

During the game, each participant must perform at least 1 time.

The game is played in several stages:

1. “Cold Appetizers”

Crossword;
Definition of terms;
Distribution of substances by classes.

2. “Hot dishes”

Compose formulas of substances;
Give names to substances
Solve the problem using the formula.

3. “Drinks”

Test number 1.

4. “Strong drinks”

Test number 2: 4 options.

5. Dessert

Solving riddles.

Assessment map of the student's contribution to the work of the group (carried out on a 5-point scale)

Surname Name	Evaluation of work by the group	Self-esteem	Teacher evaluation	final grade

Good afternoon! I am glad to welcome you to the chemical cafe “Firefly!”. The goal of our cafe will be to summarize the topic “Simple and complex substances”. Each of you took your table, and I suggest that you choose a table administrator - who will coordinate the work of his table.

Please take a look at the menu. In it, instead of the usual dishes, tasks on the topic are presented. Everyone needs to answer at least once.

Teacher activity	Student activities	Chemical content
1. Short message about the topic of the lesson Setting goals. Familiarization of students with the rules of the game. Menu view	Participation in the definition of the purpose of the lesson. Division into groups. Selecting a responsible person in the group.
2. Cold appetizers Comments on assignments. Summing up the results of the 1st stage of the game		1. Crossword Soluble base smallest particle of matter A substance made up of two elements, one of which is oxygen A substance made up of hydrogen atoms bonded to an acidic residue. A substance consisting of a metal atom bonded to one or more hydroxo groups. chemically indivisible particle. A substance composed of metal atoms bonded to an acidic residue. What objects are made of 2. Define terms: Indicator - Oxides - Acids - Salts - Grounds - The degree of oxidation - 3. Distribute the following formulas substances by class: H 2, HC1, Na 2 SO 4, H 2 SO 4, KNO 3, BaC1 2, Ca (OH) 2, H 2 S, NaOH, O 2, H 2 CO 3, N, P, KOH, Mg CO 3 , CO 2 , Na 2 O.
3. Hot dishes. Comments on assignments. Monitoring the progress of work in groups. Summing up the results of the 2nd stage.	Group selection of a hot meal. Completing a task. Group discussion. Drawing up on the board the task performed by the group. Discussion of the results of the assignment. Calculation of spent c.u.	1. Make formulas of substances: N aCO 3, H S, Ba OH, A1 C1, Z p S O 4 2. Give names to the following substances: Mg O, H 3 RO 4, BaC1 2, K 2 CO 3, Na 2 SiO 3 3. Solve the problem: The mass of copper(II) oxide is 40 g. determine the amount of the substance.
4. Drinks. Comments on assignments. Monitoring the progress of work in groups. Summing up the results of the 3rd stage.	Performing a training test task in a group. Verification and discussion of the results. Execution of tests. Calculation of lost c.u.	1. In the form of a simple substance, oxygen is contained in earth's crust atmosphere granite 2. Nitrogen shows the highest valency in oxide N2 O5 3. Most pronounced non-metallic properties tin Germany silicon carbon 4. Formulas of oxide, base, salt, respectively: BaO, F e (OH) 2, NaNO3 SiO2, CaO, K2CO3 P2O5, Na 2O, CaC12 S O3, P2O5, Ca (OH) 2 5. The amount of calcium hydroxide substance is 0.25 mol. Determine its mass.
5. Physical education. Dynamic pause
6. Strong drinks Comments on assignments. Monitoring the progress of work in groups. Summing up the results of the 4th stage.	Individual execution test items. Self-test. Filling out the test (correct answers are presented on the board) counting the spent c.u.	Test number 2 - 4 options
7. Dessert. Comments on assignments. Summing up the results of the 5th stage. Presentation of a group of winners of a sweet prize.	Solving riddles. Loan balance calculation	1. I am, of course, very needed You can't cook dinner without me Don't pickle the cucumber Don't make cold. But not only in the water. If a tear falls from your eye, You will remember my taste right away. Who is smart says: This is ... (sodium chloride) 2. To appear I managed, Calcined white chalk. The fire in the furnace gives me And the flame of a small candle. And all you have to do is take a breath So that I can come into the world. I'm in sparkling water I'm in bread, in soda - I'm everywhere. (Carbon dioxide - carbon dioxide) 3. I burn with a blue flame, I threaten you with rage. When I'm on fire, I'm flying out of the oven. (Carbon monoxide - carbon monoxide)
8. Formulation homework	Recording homework	Compose a syncwine. Who has problems repeating § 17-21.

Dessert assignments:

What is called white gold? ( Cotton.)
The name of which chemical element is found in soup with beets and other vegetables? ( B - borscht.)
What is called "living silver"? ( Fish.)
What is the name of the fur of fur-bearing animals? ( Fluffy gold.)
Throw out the 4th letter in the name of the mountain antelope, and you get the name of the chemical element of the 6th group. ( Chamois - sulfur.)
It starts with a small rodent, ends with a bull, what is the name of the chemical element? ( Arsenic.)
What chemical element "calls" a cat to visit? ( Oxygen.)

TEST #2(1). Molecules and atoms. Simple and complex substances. Signs chemical elements. Relative atomic and molecular masses. Chemical formulas.

Part A

Developed modern chemical symbolism

1) D.I. Mendeleev 3) J. Berzelius

2) A. Lavoisier 4) A. Avogadro

2. A chemical element is

1) a certain kind of atoms

2) a substance that cannot be decomposed into simpler substances

3) atoms with the same mass

4) a substance that always increases its weight during chemical transformation.

3. The relative atomic mass of a chemical element is

1) the mass of its atom

2) the mass of its atom, expressed in a.m.u.

3) the ratio of the mass of an atom to 1/12 of the mass of a carbon atom

4) the mass of its atom, expressed in grams

4. A simple substance is formed

1) identical molecules

2) atoms of one chemical element

3) molecules consisting of one atom

4) simple molecules

5. The molecular weights of Fe 3 O 4 , H 3 PO 4 , N 2 are equal, respectively

6. The mass fraction of iron in the Fe 2 O 3 compound is

7. Mass fractions of elements in the compound of iron with sulfur are equal, respectively

46.67% and 53.33%. Compound Formula

4) Fe 2 (SO 4) 3

Part B

8. Insert the missing words in the statement: “_________________________ is

the smallest chemically indivisible particles that make up molecules.

9. Establish a correspondence between the name of the substance and its type. Write down the answer

as a sequence of letters and numbers, for example, A1, B2, etc.

1) water A - simple substances

2) oxygen B - complex substances

10. Divide into groups - metals (A) and non-metals (B) - chemical elements:

Write down the answer as a sequence of letters and numbers, for example, A123, B456.

TEST #2(2). Molecules and atoms. Simple and complex substances. Signs of chemical elements. Relative atomic and molecular masses. Chemical formulas

Part A

The merit of introducing the concept of a chemical element into science belongs to

D. Dalton
DI. Mendeleev
Aristotle

Isotopes are

atoms of one chemical element
atoms of the same chemical element that differ in mass
atoms of the same chemical element that have the same mass
atoms of the same chemical element that are the same size

The value given in the table of chemical elements by D.I. Mendeleev

the relative atomic mass of a chemical element is

relative atomic mass of its heaviest isotope

relative atomic mass of its lightest isotope

relative atomic mass of its most abundant isotope in nature

average atomic mass of all isotopes, taking into account their prevalence in nature

Nitrogen (N 2) is a simple substance, since its molecule

is made up of two atoms
contains few atoms
contains identical atoms
is made up of atoms of one chemical element

The relative molecular weights of HNO 3 , P 2 O 5 , O 3 are equal, respectively

The mass fraction of manganese in the Mn 2 O 7 compound is
The mass fractions of phosphorus and chlorine in the compound are 14.87% and 85.13%, respectively. Compound formula

Part B

Fill in the missing words in the statement: “____________________ is

atoms of the same kind.

Match the name of the substance with its type. Write your answer in

1) sulfur A - simple substances

2) oxygen B - complex substances

10. Divide into groups - metals (A) and non-metals (B) - chemical elements:

TEST #3(1). Valency of chemical elements. Drawing up formulas for valency. Chemical Equations. Types of chemical reactions.

Part A

The valency of sulfur, nitrogen and carbon in their hydrogen compounds(H 2 S, NH 3, CH 4) are respectively equal

2. The symbols of the chemical elements that form simple substances-metals are written

Under the number

3. The valency of sulfur in the compounds Na 2 S, SO 3, CS 2 are equal, respectively

4. Formulas of binary compounds of calcium with nitrogen and aluminum with sulfur, respectively, are written under the number

Al 2 S 3 , Ca 3 N 2

Ca 3 N 2 , Al 2 S 3

Ca(NO 3) 2 , Al 2 S 3

Ca 3 N 2, Al 2 (SO 4) 3

5. The sum of the coefficients in the reaction equation Na + H 2 O → NaOH + H 2 is

6. Complete the reaction equation (the coefficients are indicated): Fe + CuCl 2 = ... + FeCl 2

formed from 5.6 g of iron and 3.2 g of sulfur.

Part B

8. Insert the missing words in the statement: “The mass of substances that have entered into

chemical reaction ____________________ mass of formed substances.

Set the correspondence between the left and right sides of the reaction equation.

Write down the answer as a sequence of letters and numbers, for example, A1, B2, etc.

4Al + 3O 2 \u003d A. Al 2 O3 + 3H 2 O

2Al(OH) 3 = B. 2AlCl 3 + 3H 2 O

Al 2 O 3 + 6HCl \u003d B. 2Al 2 O 3

Divide chemical reactions into groups - compounds (A) and substitutions (B):

4Fe + 3O 2 \u003d 2Fe 2 O 3

Hg (NO 3) 2 + Cu \u003d Cu (NO 3) 2 + HG

S + O 2 \u003d SO 2,

Zn + 2HCl \u003d ZnCl 2 + H 2

N 2 + O 2 \u003d 2NO

2Al(OH) 3 \u003d Al 2 O 3 + 3H 2 O

Write down your answer as a sequence of letters and numbers, for example A123, B456.

TEST #3(2). Valency of chemical elements. Drawing up formulas for valency. Chemical equations. Types of chemical reactions.

Part A

The valency of calcium, sodium and aluminum in their compounds with oxygen - CaO, Na 2 O, Al 2 O 3 - is respectively equal to

1) I, II, III 3) II, I, III

2) III, II, I 4) II, III, I

2. The symbols of the chemical elements that form simple substances-metals are written

Under the number

3. The valency of nitrogen in the compounds Na 3 N, NO, NF 3, respectively, is

1) I, II, III 3) III, I, III

2) III, II, III 4) I, II, I

4. Formulas of binary compounds of magnesium with nitrogen and calcium with sulfur, respectively

recorded under number

1) CaS, Mg 3 N 2 3) Mg (NO 3) 2, CaS

2) Mg 3 N 2, CaSO 4 4) Mg 3 N 2, CaS

5. The sum of the coefficients in the reaction equation FeCl 2 + Cl 2 → FeCl 3 is

6. Complete the reaction equation (the coefficients are indicated): Mg + 2… = H 2 + MgCl 2

7. Using the law of conservation of mass, determine the mass of iron(II) sulfide,

formed from 56 g of iron and 32 g of sulfur.

Part B

8. Insert the missing words in the statement: “_________________________ are called

conditional representation of the course of a chemical reaction by means of signs and formulas.

9. Establish a correspondence between the left and right parts of the reaction equation. Write down the answer as a sequence of letters and numbers, for example, A1, B2, etc.

1) 4Fe + 3O 2 \u003d A. Fe 2 O 3 + 3H 2 O

2) 2Fe(OH) 3 = B. 2FeCl 3 + 3H 2 O

3) Fe 2 O 3 + 6HCl \u003d B. 2Fe 2 O 3

10. Divide chemical reactions into groups - decomposition (A) and substitution (B):

1) 4Fe + 3O 2 = 2Fe 2 O 3

2) Hg (NO 3) 2 + Cu \u003d Cu (NO 3) 2 + Hg

3) 4HNO 3 \u003d 4NO 2 + O 2 + 2H 2 O

4) Zn + 2HCl = ZnCl 2 + H 2

5) CaCO 3 \u003d CaO + CO 2

6) Al (OH) 3 \u003d Al 2 O 3 + 3H 2 O

Write down your answer as a sequence of letters and numbers, for example A123, B456.

TEST #4 (1). Molar mass. Calculations on the equations of chemical reactions

Part A

What is the number of water molecules contained in a portion of a substance weighing 3.6 g?

Molar mass of the compound CuSO 4 ∙ 5H 2 O (g / mol)
What is the amount of substance (mol) contained in sulfur oxide (VI) with a mass of 12 g?
When interacting with a solution containing sodium hydroxide NaOH weighing 4 g, with a solution of copper (II) chloride Сu (OH) 2 and sodium chloride NaCl. What is the mass (g) of the oxide? (Give your answer as a whole number.)
What is the mass (g) of iron(III) chloride obtained by reacting 16.8 g of iron with chlorine?
What is the mass (g) of iron oxide Fe 3 O 4 formed during the combustion of iron weighing 11.2 g in air?
The mass of the precipitate of barium sulfate BaSO 4, formed by mixing solutions containing sodium sulfate Na 2 SO 4 weighing 1.42 g and barium chloride BaCl 2 weighing 2.8 g, is equal to
What is the mass of aluminum chloride salt AlCl 3 (g) formed as a result of the reaction of aluminum hydroxide Al (OH) 3 weighing 23.4 g and of hydrochloric acid HCl containing 35 g of hydrogen chloride?

Part B

Calculate the mass of iron(III) oxide formed by the interaction of 22.4 g of iron with 10 g of oxygen. Give your answer as an integer.
When methane (CH 4 ) burns in air, carbon dioxide and water are formed. Calculate the mass of air required to burn 16 g of methane if the mass fraction of oxygen in the air is 28.6%.

TEST #4 (2). Molar mass. Calculations on the equations of chemical reactions.

Part A

What is the number of phosphorus atoms contained in a sample of phosphorus with a mass of 155 g?

Molar mass of the compound CaSO 4 ∙ 2H 2 O (g / mol)
The mass of the sulfur sample is 19.2 g. What is the amount of sulfur substance (mol)?
What is the mass (g) of sodium carbonate Na 2 CO 3 with a quantity of substance 0.25 mol?
When a solution containing sodium hydroxide NaOH weighing 8 g interacted with a solution of copper (II) nitrate Cu (NO 3) 2, a precipitate of copper (II) hydroxide Cu (OH) 2 and sodium nitrate (NaNO 3) was formed. What is the mass (g) of copper(II) hydroxide? (Give your answer as a whole number.)
What is the mass of sulfur (g) that reacted with aluminum weighing 2.7 g?
What is the mass of iron (III) hydroxide (g) dissolved in sulfuric acid H 2 SO 4, weighing 9.8 g? Reaction scheme: Fe (OH) 3 + H 2 SO 4 → Fe 2 (SO 4) 3 + H 2 O. (Give your answer as an integer).

8. What is the mass of the precipitate of barium sulfate BaSO 4 (g) formed during mixing

solutions containing sodium sulfate Na 2 SO 4 weighing 1.6 g and barium chloride BaCl 2

weighing 2.08 g?

Part B

9. Calculate the mass of copper (II) oxide formed by the interaction of 27 g of aluminum with

25 g of oxygen. Give your answer as an integer.

When methane (CH 4) burns, carbon dioxide and water are formed. Calculate the mass of air required to burn 32 g of methane if the mass fraction of oxygen in the air is 28.7%.

Final (thematic) control test

TEST No. 1(1). Generalization and control of knowledge on the topic "Initial chemical concepts"

Part A

To separate a mixture of powders of chalk and table salt,

use magnifying glass and tweezers
add water to the mixture, then filter
pass the mixture through a sieve
add water to the mixture, then filter and evaporate the filtrate

Scroll pure substances placed under number

distilled water, aluminum, air
the soil, sea water, perfume
copper, iron, lead
steel, bronze, cupronickel

souring milk and burning candles
ice melting and water evaporation
freezing water and rotting residues
the glow of an electric lamp and the formation of clouds

Formulas only simple substances

PH 3 , P 4 , O 3
NH 3 , N 2 , N 2 O
H 2 O, Cl 2 , HCl

The ammonia molecule is made up of

three nitrogen atoms and one hydrogen atom
one nitrogen atom and three hydrogen atoms
one nitrogen atom and one hydrogen atom
three nitrogen atoms and three hydrogen atoms

The sum of the coefficients in the equation for the reaction of phosphorus (P) with an excess of oxygen (O 2)

The chromium valency in the Cr 2 O 3 compound is

The mass fraction of zinc in zinc chloride is

Part B

A. Atoms are the smallest chemically indivisible particles that make up molecules.

B. When physical phenomena the molecules of a substance are preserved, and in chemical ones they are destroyed.

1) both statements are true

2) statement A is true, statement B is false

3) statement B is true, statement A is wrong

4) both statements are wrong

10. Establish a correspondence between the reaction equation and its type. Write your answer in

in the form of a sequence of letters and numbers, for example, A1, B2, etc.

Fe 2 O 3 + 6HCl \u003d 2FeCl 3 + 3H 2 O A. Substitution

Fe + 2HCl \u003d FeCl 2 + H 2 B. Connection

4Fe + 3O 2 \u003d 2Fe 2 O 3 V. Decomposition

2Fe (OH) 3 \u003d Fe 2 O 3 + 3H 2 O G. Exchange

TEST #1 (2). Generalization and control of knowledge on the topic "Initial chemical concepts"

Part A

A mixture of sulfur and iron powders can be separated using

filtering
decantation
distillation

The list of mixtures is placed under the number

sugar, iron, air
soil, sea water, perfume
copper, bronze, lead
steel, oxygen, cupronickel

Only chemical phenomena are described under the number

carbonization of sugar and candied jam
frost formation and cloud formation
souring of milk and release of gas from a bottle of lemonade
gas formation when mixing soda with vinegar and blackening of silver products

Formulas of only simple substances are combined under the number

S8, P4, NH3
NaOH, KOH, HNO3

The sulfur(IV) oxide molecule consists of

one sulfur atom and one oxygen atom
one sulfur atom and three oxygen atoms
one sulfur atom and two oxygen atoms
two sulfur atoms and one oxygen atom

The sum of the coefficients in the equation for the reaction of aluminum with oxygen (O 2) is

The valency of chromium in the CrO 3 compound is
The mass fraction of calcium in calcium nitride is

Part B

Express your opinion about the judgments:

A. Molecules of substances are in continuous motion. Travel speed

molecules depends on temperature.

B. During physical phenomena, the molecules of a substance are destroyed, and during chemical -

are saved.

both statements are correct

statement A is correct, statement B is wrong

statement B is correct, statement A is wrong

both statements are wrong

Establish a correspondence between the reaction equation and its type. Write your answer in

in the form of a sequence of letters and numbers, for example, A1, B2, etc.

Al 2 O 3 + 6HCl \u003d 2AlCl 3 + 3H 2 O A. Substitution

2Al + 6HCl \u003d 2AlCl 3 + 3H 2 B. Connection

4Al + 3O 2 \u003d 2Al 2 O 3 V. Decomposition

2Al(OH) 3 \u003d Al 2 O 3 + 3H 2 O G. Exchange

State budgetary educational institution

Education Center No. 354 named after. Karbysheva

Moscow Central District

Chemistry test

“Simple and complex substances. Qualitative and quantitative composition of the substance "

prepared

biology and chemistry teacher

Chervinskaya Elena Vladimirovna

year 2013

Option number 1

Part I

which does not contain impurities

which is rarely found in nature

water, iron, bronze

air, water, hydrogen sulfide

salt, sugar, soda

soda, nitrogen, diamond

Which picture shows the mixture1.

Five phosphorus atoms can be designated as follows:

BUT 5

potassium 3. nitrogen

oxygen 4. magnesium

BUT 6

Which of the entries means largest number oxygen molecules:

3. About

3O 4. O

BUT 7

About 3.

4. About

BUT 8

Relative molecular mass iron oxide Fe 3 O 4 is equal to

232 3. 110

4. 34

not typical for complex substances:

compound composition is constant

A1 0

K 3 RO 4

A11

In 7SO recording 2 coefficient is:

7 3. 9

2 4. 14

A12

Recorded 6H 2 SO 3 the indexes are:

6, 2, 3 3. 2, 3

6 4. 2, 1 and 3

Part I I

IN 1

CHARACTERISTIC

IN 2

FORMULA COMPOSITIONBUT) HCl 1) Simple substanceB) H 2 AT) NaBr 2) Complex substanceG) MgO D) Cu

Part I II

Describe the qualitative and quantitative composition of the substance according to its formula Na 2 SO 3 .

The composition of the substance is expressed by the formula P 2 O 5 . Define:G) mass fractions elements

Simple and complex substances. Qualitative and quantitative composition of the substance.Option No. 2

Part I

which contains impurities

containing atoms of different chemical elements

containing atoms of one chemical element

which does not occur in nature

nitrogen, diamond, water

iron, graphite, hydrogen

sugar, salt, water

copper, alcohol, hydrogen

Three chlorine molecules can be represented as follows:

Cl 3 3Cl 3Cl 2 O 5 3Cl 2

BUT 5

sodium 3. sulfur

hydrogen 4. chlorine

Which of the entries indicates the largest number of nitrogen molecules:

BUT 7

Which molecule contains the smallest number of atoms?

CO 4. O

BUT 8

Relative molecular weight of propane C 3 H 8 is equal to

11 3. 26

14 4. 44

Which of the following signsnot typical for simple substances:

composition can be depicted as one chemical formula

consists of atoms of several chemical elements

is made up of atoms of one chemical element

compound composition is constant

A1 0

The composition of the substance is expressed by the formula C 2 H 6 A. The total number of atoms is:

A11

Recorded 4SO 2 coefficient is:

2 3. 6

4 4. 8

A12

In record 7C 4 H 8 the indexes are:

7 3. 4, 8

7,4 4. 7, 4, 8

Part I I

IN 1

Establish a correspondence between a certain chemical concept and its characteristic

CHARACTERISTIC

IN 1

Establish a correspondence between the chemical formula of a substance and its composition: FORMULA COMPOSITIONBUT) Cl 2 1) Complex substanceB) H 2 SO 4 AT) N 2 2) Simple substanceG) AlCl 3 D) CuO

Part I II

3 RO 4 .

The composition of a substance is expressed by the formula N 2 O 3 . Define:a) the number of chemical elements that make up the moleculeb) the total number of atoms in the moleculec) relative molecular weightd) mass fractions of elements

Simple and complex substances. Qualitative and quantitative composition of the substance.Option number 3

Part I

A simple substance is a substance

which has a permanent

which can be isolated from a mixture

containing atoms of one chemical element

containing atoms of different chemical elements

Only complex substances are listed:

sulfuric acid, water, sugar

water, hydrogen chloride, air

salt, sugar, graphite

carbon dioxide, oxygen, iron

Which picture shows a compound1.

Three sulfur atoms can be designated as follows:

S 3 3S 3S 3 SO 3

BUT 5

The smallest relative atomic mass It has:

sulfur 3. sodium

phosphorus 4. boron

BUT 6

Which of the entries indicates the largest number of bromine molecules:

BUT 7

Which molecule contains the smallest number of atoms?

With

BUT 8

The relative molecular weight of silicic acid is

Which of the following signsnot typical for complex substances:

composition can be represented by a single chemical formula

consists of atoms of several chemical elements

is made up of atoms of one chemical element

compound composition is constant

A1 0

The composition of a substance is expressed by the formula Na 2 CO 3 . The total number of atoms is:

A11

In entry 5 NH 3 coefficient is:

A12

Recorded 10НNO 3 the indexes are:

3.1, 1 and 3

10 and 3 4. 3

Part I I

AT 1

Establish a correspondence between a certain chemical concept and its characteristic

CHARACTERISTIC

AT 2

Establish a correspondence between the chemical formula of a substance and its composition: FORMULA COMPOSITIONBUT) H 2 SO 3 1) Simple substanceB) H 2 S AT) Br 2 2) Complex substanceG) Al D) NO

Part I II

Describe the qualitative and quantitative composition of the substance according to its formula H 3 RO 4 .

The composition of a substance is expressed by the formulaAl 2 O 3 . Define:a) the number of chemical elements that make up the moleculeb) the total number of atoms in the moleculec) relative molecular weightd) mass fractions of elements

Simple and complex substances. Qualitative and quantitative composition of the substance.Option number 4

Part I

A compound is a substance

which occurs in nature which contains impurities containing atoms of one chemical element containing atoms of different chemical elements

Only simple substances are listed:

lead, nitrogen, water diamond, graphite, oxygen sugar, salt, alcohol copper, hydrogen sulfide, glass

Which picture shows a simple substance1.

The four nitrogen molecules can be represented as follows:

BUT5

The largest relative atomic mass is:

fluorine 3. carbon potassium 4. nitrogen

Which of the entries indicates the largest number of hydrogen molecules:

H 12 3. 3 H 6H 2 4. H 2

BUT7

Which molecule contains the smallest number of atoms?

HNO

3. HNO 3 N 2 O 5 4. H 2 SO 4

BUT8

Relative molecular weight of sodium nitrateNaNO 3 is equal to

3. 81 53 4. 85

Which of the following signsnot typical for simple substances:

compound composition is constant consists of atoms of several chemical elements is made up of atoms of one chemical element composition can be represented by a single chemical formula

A10

The composition of a substance is expressed by the formulaK 2 CO 3 . The total number of atoms is:

A11

In the notation 12SiO 2 coefficient is:

2 3 . 14

1 2 4. 24

A12

Recorded 7H 2 SO 3 the indexes are:

7 3. 7, 2 and 3 2 and 3 4. 2, 1 and 3

Part I I

IN 1

Establish a correspondence between a certain chemical concept and its characteristic

CHARACTERISTIC

BUT

IN 2

Establish a correspondence between the chemical formula of a substance and its composition: FORMULA COMPOSITIONA) NClO 4 1) Complex substanceB)H 2 AT)NO 2) Simple substanceG)I 2 D)PbO

BUT

Part I II

Describe the qualitative and quantitative composition of the substance according to its formula K 2 SiO 3 .

The composition of a substance is expressed by the formulaSO 3 . Define:a) the number of chemical elements that make up the moleculeb) the total number of atoms in the moleculec) relative molecular weightd) mass fractions of elements

Answers

Option 1 C1. Describe the qualitative and quantitative composition of the substance according to its formulaNa 2 SO 3

C2. The composition of the substance is expressed by the formula P 2 O 5 .