Chemical reactions
What is photosynthesis?
A process in which plants transform light energy into chemical energy.
Does chlorine or Helium have zero valency?
Helium has zero valency
Can sound waves generate heat?
Yes sound can generate heat
What is the fastest speed on earth?
The speed of light is the fastest speed in the milky way
What is an adaptation in science?
An evolutionary process in which an organism becoems better able to live in its habitats
What is a chemical reaction?
A process in which two or more molecules interact to form a new chemical substance .
While moving down in a group the metalic character
…..
Increases
Can wind travel faster then the speed of light?
Light travels faster since speed of light is the fastet thing in the world
When a ray of light travels from water to air it bends…
..Away from the normal
Give an example of an organisms adaptation
Polar bear used to have thinner fur but due to living in very cold climates its furs got very thick
is rust a chemical reaction? ( explain why)
Rusting is a chemical reaction because: it involves a reaction that changes iron into a new substance (iron oxide)
What is the maximum number of electrons that can accommodate in a k shell?
a K shell can accommodate a maximum of 2 electrons .
What is meant by sound?
Sound is a combination of low and high pressure waves which is generated by a vibrating body
Name three natural sources of light
Natural sources of light are sun, lightning, glowworms
What is DNA?
DNA is a molecule found in the nucleus of cells that holds the genetic information of an organism.
Why is digestion considered a chemical reaction?
The food undergoes many chemical changes, before being absorbed by the body. The complex substances that we eat is changed into simpler substances
Metals are found on the left and in the middle.
Which is the medium through which sounds travel the fastest?
The sound waves move quickest through solids
Can air make shadows?
It can cast reflections via refractions
What phenotype is produced from an XY genotype?
These are make phenotypes
What is decomposition? Why is it considered a chemical reaction? Back it up.
Decomposition is a chemical process of breaking down an organic substance through either biotic or abiotic means
How many metals are there int he periodic table?
93 elements out of 118 are metals
Which is the medium through which sounds travel moves the slowest?
The sound waves move the slowest through gases
What colour is the sun?
Tye sun is white but due to sun emitting all colours of the rainbow at ocne we can’t see it and call it “white”
What type of trees can be used to examine close genetic relationships?
Genetic connections can be depicted by a phylogenetic tree