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Matter:properties And Change
Test Description: Matter:properties and change
Instructions: Answer all questions to get your test result.
1) According to the law of conservation of mass, which of thee statements is true?
A
New matter is created in a chemical reaction.
B
The mass of the products in a chemical reaction equals the mass of the reactants.
C
Atoms are broken own into smaller parts in a chemical reation.
D
The mass of the reactants in a chemical reaction is greater than the mass of the products.
2) When substances are combined to formed a mixture,they
A
keep their original properties to form a mixture, they
B
form a new compound
C
cannot be separated physically
D
form new chemical bonds.
3) If you heat a liquid to determine the temperature at which it forms bubbles and changes to a gas, you are measuring
A
a physical property called conductivity
B
a chemical property called reactivity
C
a physical property called boiling point
D
a chemical property called solubility
4) Elements in the same column of the periodic table have
A
atoms of the same size
B
similar atomic mass
C
similar chemical properties
D
the same number of protons
5) which of these is a physical change
A
forming a percipitate
B
rusting
C
burning
D
melting
6) which is always true of a balanced chemical equation?
A
Both sides of the equation are the same elements and the same number of atoms
B
The subscripts on one side of the equation are the same as the subscripts on the other side
C
The number of molecules is the same on both sides of the equation
D
Coefficients on both sides of the equation are multiples of 2
7) Which of the following statements about elements is false
A
An element is represented by a chemical symbol
B
An element is a pure substance
C
An element is made up of compounds
D
Each element has it own atomic number
8) Where are the metalloids located in the periodic table
A
In the far left column
B
In the far right column
C
In the top row
D
On the step like line
9) Which is the most widely seen ethical issue related to biotechnology today
A
cloning
B
mutations
C
organic foods
D
genetically modified organisms
10) What is the benefit of biotechnology
A
it provides economic benefits
B
It provides careers
C
it provides safe guards to disease
D
all of the above
*select an answer for all questions
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