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chemical change and chemical bond

Total questions: 42

Worksheet time: 27mins

Name
Class
Date
1.

Combustion of fuel is of __________ and irreversible change

a)

Fast

b)

Slow

c)

None

2.

What is a natural chemical change

a)

Respiration

b)

Combustion of fuels

c)

Softening of hard water

3.

The two different types of chemical bonds are

a)

Ionic and covalent bond

b)

Anions and cations bond

c)

Valent and covalent bond

4.

This type of chemical bond occurs when an electron is gained or lost by an atom of an element

a)

Covalent

b)

Ionic

c)

Cations

5.

The chemical bond formed due to an electrostatic force of attraction between the oppositely charged cation and anion is called

a)

Ionic compound

b)

Electrovalent bond

c)

Electrostatic bond

6.

What is used to clean Shahabad tile

a)

Sulphuric acid

b)

hydrochloric acid

c)

Citric acid

7.

Which type of chemical bond occurs when electrons are shared by atoms of at least two different elements

a)

Valent bond

b)

Ionic bond

c)

Covalent bond

8.

In the equation c+o2➡️ Co2 which of them are the reactants

a)

C+02

b)

None

c)

Co2

d)

Both

9.

A colourless solution of calcium hydroxide in a test tube turns ____________ after blowing in it trough a blow tube for some time

a)

stays the same

b)

Turns red

c)

Turns yellow

d)

Become milky

10.

water is a covalent bond

a)

True

b)

False

11.

During respiration we inhale carbon dioxide and exhale oxygen

a)

True

b)

False

12.

Is the equation of CaCI2+Na2CO3—>CaCO3+NaCI balanced

a)

True

b)

False

c)

None

13.

Reactants are on the_________ side of the equation

a)

Right side

b)

Left side

c)

There are no reactants in an equation

14.

what Is the reactant in the equation of calcium carbonate

a)

Carbon dioxide+calcium hydroxide

b)

Chlorine+calcium hydroxide

c)

None above

15.

Rusting I’d iron is a _________ chemical change

a)

physical

b)

Slow

c)

Fast

16.
Ice melting
a)
Chemical Change
b)
Physical Change
17.
Wood burned in a fireplace
a)
Chemical Change
b)
Physical Change
18.
Any change that alters a substance without changing it into another substance is a(n) ____________ change. 
a)
Physical
b)
Chemical
19.
____________ is anything that has mass and takes up space.
a)
Matter
b)
An Element
20.
A chemical change is also referred to as a(n) _____________.
a)
Chemical Reaction
b)
Physical Reaction
21.
A(n) ____________ is a solid formed from liquid reactants during a chemical reaction.
a)
precipitate
b)
product
22.

Inert gases do not react with another elements because they do not

Gas adi tidak bertindak balas dengan unsur lain kerana mereka tidak

a)

Share, donate or transfer electron

Berkongsi, menderma atau menerima elektron

b)

Change the physical state

Menukar keadaan fizikal

c)

add the number of shell

Menambahkan bilangan petala

d)

Reduce the number of shell

Mengurangkan bilangan petala

23.

Why do elements tend to form chemical bond?

Mengapakah unsur cenderung untuk membentuk ikatan kimia?

a)

To increase the reactivity

Untuk menambahkan kereaktifan

b)

To add the number of electrons

Untuk menambahkan bilangan elektron

c)

To reduce the number of electrons

Untuk mengurangkan bilangan elektron

d)

To achieve stable electron arrangement as in the inert gases

Untuk mencapai susunan elektron yang stabil seperti dalam gas adi

24.

Ionic bond formed by

Ikatan ion terbentuk daripada

a)

Sharing of electrons

Perkongsian elektron

b)

Transfer of electrons

Pemindahan elektron

c)

Adding the valence electrons

Menambahkan elektron valens

d)

Reducing the proton number

Mengurangkan nombor proton

25.

Which of the following is the electron arrangement for Magnesium ion?

Berikut yang manakah susunan elektron bagi ion Magnesium?

a)

2.6

b)

2.8

c)

2.8.2

d)

2.8.8

26.

Proton number for Chlorine is 17. Which of the following is the electron arrangement for Chloride ion?

Nombor proton bagi Klorin ialah 17. Yang manakah antara berikut merupakan susunan elektron bagi ion Klorida?

a)

2.8

b)

2.8.1

c)

2.8.8

d)

2.8.7.1

27.

Which ion has the same number of electrons as one Sodium ion?

[Proton number : Na = 11, Mg = 12, Ca = 20, Cl = 17, K = 19]


Ion yang manakah mempunyai bilangan elektron yang sama dengan satu ion Natrium?

[Nombor proton = Na = 11, Mg = 12, Ca = 20, Cl = 17, K = 19]

a)

Cl-

b)

K+

c)

Mg2+

d)

Ca2+

28.

Which of the following statement is true about the atom in the diagram?

Pernyataan manakah benar mengenai atom di dalam rajah?

a)

Consist of 13 electrons

Mempunyai 13 elektron

b)

Receive 3 electrons to form an ion

Menerima 3 elektron untuk menjadi suatu ion

c)

Its electron arrangemnet is 2.8

Susunan elektronnya ialah 2.8

d)

Located in period 2 in the perioic table of element

Terletak pada Kala 2 dalam jadual berkala unsur

29.

Which partner of elements form an ionic compound?

Pasanagn unsur yang manakah membentuk sebatian ion?

a)

K and L

K dan L

b)

M and N

M dan N

c)

K and M

K dan M

d)

L and N

L dan N

30.

_____________ atom will donate electrons to achieve stable electron arrangement

Atom ___________ akan menderma elektron untuk mencapai susunan elektron stabil

a)

Non metal

bukan logam

b)

Metal

logam

31.

How many Nitrogen (N) atoms are in 4NH3?

a)

4

b)

1

c)

3

d)

12

32.
Ionic bonds are between...
a)
nonmetals and nonmetals
b)
carbon and oxygen
c)
metals and nonmentals
d)
hydrogen and chlorine
33.
A _________________ is composed of symbols and subscripts indicating the number of atoms of an element in a compound.
a)
Chemical Equation
b)
Chemical Reaction
c)
Synthesis Reaction
d)
Chemical Notation
34.
Atoms form compounds when the compound is more ______________ than the separate atoms.  Noble gases are more _________than other elements because they have a complete outer energy level.
a)
reactive
b)
stable
c)
explosive
d)
toxic
35.
Elements that do not have full outer energy levels are more stable in __________________.
a)
bonds
b)
formulas
c)
reactions
d)
compounds
36.
A ____________is the force that holds atoms together in a compound.
a)
Chemical Formula
b)
Chemical Reaction
c)
Chemical Bond
d)
Synthesis Reaction
37.
A _______ is a charged particle because it has more or fewer electrons than protons.  When an atom _____ an electron, it becomes a positively charged ion.  When an atom ____an electron, it becomes a negatively charged ion.
a)
isotope, gains, loses
b)
isotope, loses, gains
c)
ion, loses, gains
d)
ion, gains, loses
38.
An ionic compound is held together by the _______--the force of attraction between opposite charges of the atoms.
a)
Covalent Bond
b)
Ionic Bond
c)
Synthetic Bond
d)
Molecular Bond
39.
The result of this bond is a _________compound.
a)
neutral
b)
polar
c)
positively charged
d)
negatively charged
40.
__________are neutral particles formed as  result of sharing electrons.
a)
Protons
b)
Electrons
c)
Molecules
d)
Ions
41.
Atoms can form double or triple ______depending on whether they share two or three pairs of electrons.
a)
Molecules
b)
Bonds
c)
Compounds
d)
Elements
42.
Electrons shared in a molecule are held ________to the atoms with the larger nucleus.
a)
more closely
b)
relative
c)
adjacent
d)
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