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Chemical Formula and Chemical Equations (Concepts)

Total questions: 31

Worksheet time: 29mins

Name
Class
Date
1.

It is a study of matter divided by pure substances such as elements , compound and mixtures.

(a)  

2.

It is anything that occupies space and has mass

(a)  

3.

Matter is divided into two class /type /kind. What are they?

a)

Pure Substances

b)

Mixtures

c)

Matter

d)

Compounds

4.

Pure Substances are?

a)

Elements

b)

Solution

c)

Compound

d)

Mixtures

5.

Types of Mixtures are?

4 lines
6.

It is in a fixed position and cannot be separated into simpler substances by physical means.

a)

Pure Substance

b)

Compound

7.

Examples of this type of matter are salt, sugar , oil , coffee and water . They can only be exchange in identity and properties by chemical methods and their properties do not vary.

a)

Mixtures

b)

Compound

c)

Pure Substances

d)

Elements

8.

It is a variable composition: component retain their characteristic properties;

(a)  

9.

may be separated into pure substances by physical methods ; mixtures of different compositions may have widely different properties

(a)  

10.

do not have the same composition; distinguishabel

a)

Homogeneous

b)

Heterogeneous

11.

have the same composition throughout one texture, color and consistency

a)

Heterogeneous

b)

Homogeneous

12.

pure substances that cannot be decomposed into simpler substances by chemical changes

a)

elements

b)

compounds

c)

solution

d)

mixtures

13.

can be decomposed into simpler substances by chemical changes

a)

compounds

b)

mixtures

c)

elements

14.

Types of solutions are?

4 lines
15.

a material that when freshly prepared, polisged or fractured shows a lustrous apperance and conducts electricity and heat relatively well

(a)  

16.

an element that has properties that are intermediate between those of metals and non metals . they are also called semi-metals

(a)  

17.

elements that does nit display the properties of a metal. doesn't gace a high melting point and boiling point

(a)  

18.

a compound in which two or more chemical elements are combined other than carbon

(a)  

19.

a type of compound that are generally any chemical compounds that contains carbon

(a)  

20.

a bond between atoms with very different electronegativity values

a)

ionic bonds

b)

covalent bonds

c)

metallic bonds

21.

a bond to other metals to share valence electrons

a)

covalent

b)

metallic

c)

ionic

22.

a type of bond where nonmetals atoms share electrons

a)

metallic

b)

covalent

c)

ionic

23.

What do you call the atoms that have equal number of protons and electrons. It is a balance of positive and negative charges .

(a)  

24.

positively charged ions that gave more

protons than electrons

(a)  

25.

negatively charged ions that have more electrons than protons due to to the gain of one or more electrons

(a)  

26.

It is used to describe chemical reactions . It is composed of reactants and products .

(a)  

27.

a reaction where one element displaces another from a compound

a)

combustion

b)

decomposition

c)

Single Displacement

d)

metathesis or double replacement

e)

oxidation-reduction

28.

the positive and negative ions in the compound appear to change partners forming two new compounds

a)

oxidation-reduction

b)

double displacement

c)

double replacement

29.

two o more substances combined to form a compound

(a)  

30.

a compound decomposes to produce two or more substances

(a)  

31.

loss of electons: increase in ox. number

gain of electrons: decrease in ox. number

a)

methatesis

b)

metathesis

c)

oxidation-reduction