frame a best question for matter and chemical formula class 7
Answers
Answer:
What is a neutralization reaction?Give Examples.
How is a combination reaction different from decomposition reaction? Explain using examples
Hope this helps. Plz mark as brainliest.
Answer:
20 questions based on matter and chemical formulae
Explanation:
I fill in the blanks
1. matter is made up of atoms and _____
2.pure substances are classified as elements and _____
3.______ are substanves in which two or more substances are physically mixed together in any proportion.
4.a ______ can be separated into its components by chemical or physical means.
5.two or more atoms of ______ elements combine together chemically to form a compound.
6.matter is made up of tiny particles called _____
II TRUE or false,if false correct them
1.valency of oxygen is 2 _
2. the elements or compounds that react are called the products._
3.sodium chlorine molecule is an example of a compound._
4.combining capacity of an element is called it's valency.
III chose the correct option
1. a compound is made up of
a. two or more atoms of different elements
b.two or more atoms of same elements
c.atoms of different elements in definite ratio.
d.none of these
2.what is the charge on an electron?
a.negative charge
b.positive charge
c. both a and b
d.no charge
3.what is the chemical symbol.for soduim oxide
a. Na(OH)
b.NA(OH)
c.NaOH
d.naoh
4.how many valency does Si has
a.1
b.2
c.3
d.4
5.which particles reside inside the nucleas of an atom.
a. protons and electrons
b.protons and neutrons
c.neutrons and electron
d none
IV answer in one word
1.is argob element or compound
2.atoms of two different elements are
V answer the following
1. what do you understand by a balanced chical equation? exaplain with the help of an example
2.balance the following reactions
Zn+HNO3--》 Zn(NO3)2+H2
what is a compound .exaplain with example.