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Unit exam 4, 8th

Total questions: 55

Worksheet time: 1hrs 11mins

Name
Class
Date
1.

Cual es la nomenclatura stock del siguiente compuesto: Co2S3

a)

Sulfuro de cobalto

b)

Sulfuro de cobalto (II)

c)

Sulfuro de cobalto (III)

2.

¿Cuál es el nombre correcto de BaBr2?

a)

Bromuro de bario

b)

Dibaruro de bromo

c)

Bromuro de bario (I)

3.

Nomenclatura stock para: NaCl

a)

Monosodiuro de cloro

b)

Cloruro de sodio (V)

c)

Cloruro de sodio

4.

Nomenclatura stock de MgS

(a)  

5.

Selecciona la fórmula correcta del sulfuro de aluminio

a)

Al2S3

b)

Al2S2

c)

AlS

6.

Escriba la fórmula de cloruro de litio

(a)  

7.

Nomenclatura stock de KI:

(a)  

8.
In chemical reactions, what does the principle of conservation of mass mean?
a)
Matter is not created or destroyed.
b)
The total mass of the reactants is greater than the total mass of the products.
c)
The total mass of the reactants is less than the total mass of the products.
d)
Matter is not changed.
9.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
10.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
11.

a substance that is created during a chemical reaction

a)

reactant

b)

product

c)

subscript

12.

starting material in a chemical reaction

a)

subscript

b)

coeffient

c)

reactants

13.

Is the following equation balanced?

Al + O2 ---> 2 Al2O3

a)

Yes

b)

No

14.
Why is the following chemical equation not balanced?
H2 + O2 --> H2O
a)
each side of the equation has a different number of oxygen atoms
b)
each side of the equation has a different number of hydrogen atoms
c)
each side has the same mass
15.

How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3

a)

2

b)

6

c)

1

d)

4

16.

The small numbers in a chemical formula:

(the BLUE numbers)

a)

Subscripts

b)

Coefficients

c)

Numbers

d)

Molecules

17.

Balance this equation:

H2 + Cl2 ---> HCl

a)

It is balanced.

b)

H2 + Cl2 ---> 2HCl

c)

3H2 + Cl2 ---> 6HCl

d)

H2 + 3Cl2 ---> 6HCl

18.

What type of chemical reaction would the following equation represent? 2H2 + N2 → 2NH3

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

19.

Which type of reaction is represented by the following chemical equation? 2H2O2 → 2H2O + O2

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

20.

Which type of reaction is represented by the following chemical equation? 2HCl + Zn → ZnCl2 + H2

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Oxidation-Reduction

21.

Which type of reaction is represented by the following chemical equation? HCl + NaOH ↔ H2O + NaCl

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

22.

Balance the following equation: __ KCl + __ O2 → __ KClO3

a)

4, 3, 3,

b)

2, 2, 1

c)

2, 3, 2

d)

3, 4, 3

e)

2, 2, 3

23.

Which of the following is a compound?

a)

zinc (Zn)

b)

magnesium (Mg)

c)

sodium chloride (NaCl)

d)

potassium (K)

24.

Wich one is a decomposition reaction?

a)

Mg2O --> Mg + O2

b)

2HCl <-- H2 + Cl2

c)

2LiBr + K2S --> Li2S + 2KBr

d)

Na2O + H2 --> 2Na + H2O

25.

Wich one is a double replacement reaction?

a)

Mg2O --> Mg + O2

b)

2HCl <-- H2 + Cl2

c)

2LiBr + K2S --> Li2S + 2KBr

d)

Na2O + H2 --> 2Na + H2O

26.

What is an example of a single replacement reaction?

a)

Fe + CuSO4 → FeSO4 + Cu

b)

H2 + O2 → 2H2O

c)

Ca + 2H2O → Ca(OH)2 + H2

d)

Zn + 2HCl → ZnCl2 + H2

27.

Which of the following is an example of an element?

a)

Water

b)

Carbon

c)

Salt

d)

Sugar

28.

Which of the following is a decomposition reaction?

a)

2H2+O2→2H2O2H_2 + O_2 \rightarrow 2H_2O

b)

2Na2O→4Na+O22Na_2O\rightarrow4Na_{ }+O_2

c)

CH4+2O2→CO2+2H2OCH_4 + 2O_2 \rightarrow CO_2 + 2H_2O

d)

Na+Cl2→NaClNa + Cl_2 \rightarrow NaCl

29.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
30.
What is the number before a chemical formula called?
Ex: 2H2 + O2 --> 2H2O
a)
Coefficient
b)
Subscript
c)
Atom
d)
Equation
31.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
32.
Is the following equation balanced?
2C2H2 + 5O2 --> 4CO2 + 2H2O
a)
yes
b)
no
33.

The coefficient in 3H2O is

a)

6

b)

5

c)

2

d)

3

34.

How many Hydrogen are in 4 H2O?

a)

6

b)

8

c)

2

d)

4

35.

Predict the products for the this Double Replacement reaction:

Ag3N+ KCl →

a)

AgCl + K3N

b)

AgK + ClN3

c)

KAg + N3Cl

d)

ClAg + NK3

36.

Predict the product of this synthesis reaction:

Al+3 + S-2 →

a)

AlS

b)

AlS5

c)

Al2S

d)

Al2S3

37.

Predict the products for the decomposition of aluminum oxide, Al2O3 →

a)

Al + O2

b)

O + Al2

c)

O3Al2

d)

Al + H2O

38.

Predict the products for the this Single Replacement reaction: (Copper has a charge of 1+)

Mg + CuCl →

a)

MgCl2 + Cu

b)

Mg + Cu

c)

MgCu + Cl2

d)

MgCl + Cu2

39.

Predict the products of this single replacement reaction: Na + MgBr2 →

a)

Br2Na + H2

b)

NaBr + Mg

c)

NaMg + Br2

d)

NaMgBr2

40.
What is the oxidation number of Fe in FeO?
a)
+1
b)
-1
c)
+2
d)
-2
41.
How are metal oxides formed?
a)
When metals react with oxide.
b)
When metals react with water.
c)
When metals react with air.
d)
When metals react with oxygen.
42.
The rusting of iron is an example of
a)
a reduction reaction.
b)
an oxidation reaction.
c)
a reaction of iron with water.
d)
a reaction that dissolves iron.
43.

El elemento que se encuentra en la posición 11 de la tabla periódica (el 11 es el número atómico) es __________

a)

Un elemento metálico

b)

Un elemento no metálico

c)

Un metaloide

d)

Un compuesto

44.

El elemento que tiene de símbolo Br con número atómico 35 es considerado_______ por su posición en la tabla:

a)

Un no metal

b)

Un metal

c)

Un metaloide

d)

un ión

45.

Tipo de compuesto que se forma al combinar el elemento en posición 20 y en posición 8 de la tabla periódica.

a)

Aleación

b)

Compuesto metálico

c)

Compuesto molecular

d)

Compuesto iónico

46.

El elemento en la posición 17 es un no metal y se llama Cloro

a)

Falso

b)

verdadero

47.

Ejemplo de no metal:

a)

Ca

b)

S

c)

Fe

d)

K

48.

¿Cuáles elementos se encuentran enmedio y al lado izquierdo (azul) de la Tabla Periódica?

a)

los metales

b)

los metaloides

c)

los no metales

49.

Símbolo de mercurio es:

a)

Hg

b)

Mr

c)

Me

d)

Mc

50.

símbolo de platino

a)

Pl

b)

Pt

c)

Pa

d)

Pn

51.

Número atómico 12 le pertenece a ...

a)

C

b)

O

c)

Mg

d)

Ca

52.

Número atómico 21 le pertenece a ...

a)

Sc

b)

Mg

c)

N

d)

Be

53.

¿Qué elementos no forman compuestos, porque son estables?

a)

Los gases nobles

b)

metales

c)

metaloides

d)

no metales

54.

Los elementos que se encuentran de color verde, son:

a)

metales

b)

Metaloides

c)

no metales

d)

gases nobles

55.

¿Cuál es el símbolo del fósforo?

a)

Fo

b)

P

c)

Po

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