Photosynthesis is a….in which plants combine carbon dioxide and water to produce glucose.
a) physical reaction
b) reversible reaction
c) chemical reaction
d) none of these
Photosynthesis occurs in the presence of …….
a) sunlight
b) moonlight
c) twilight
d) none of these
When substance reacts with oxygen and releases energy, the reaction is called………
a) condensation
b) combustion
c) evaporation
d) photosynthesis
Explanation:Combustion is a chemical process in which a
substance reacts rapidly with oxygen and gives off heat. The original substance
is called the fuel, and the source of oxygen is called the oxidizer. The fuel
can be a solid, liquid, or gas, although for airplane propulsion the fuel is
usually a liquid.
If flame is
produced during combustion, the reaction is called……..
a) condensation
b) burning
c) evaporation
d)
photosynthesis
Chemical Equation And Balancing:
Chemical equations are symbolic representations of
chemical reactions in which the reactants and the products are expressed in
terms of their respective chemical formulae.
A balanced chemical equation occurs when
the number of the atoms involved in the reactants side is equal to the number
of atoms in the products side. In this chemical reaction, nitrogen (N2) reacts
with hydrogen (H) to produce ammonia (NH3). The reactants are nitrogen and
hydrogen, and the product is ammonia.
The symbolic
representation of a chemical reaction is called chemical……….
a) equilibrium
b) equation
c) process
d)
all of these
