1) c = 5cents/min × m
2) x = (2+c) miles
1) Cost paid per minute = 5 cents
Or we can also write it as cost per minute = 5 cents/min
Suppose Tom uses phone for m minutes, then cost (c)will be given an expression :
c = 5cents/min × m
2) Distance covered by Clint in a week = c miles
Distance covered by Brenda = x
Brenda runs 2 miles more each week than Clint.
x = (2+c) miles
The chemical formula for a covalently bonded group of atoms is called a
"Polyatomic ion" would be the covalently bonded group of atoms.
→ Nitrate ion ()
A charged group of covalently bonded atoms is called a(n)... A covalent bond between two atoms produced by sharing two pairs of electrons is called a(n)... The simplest collection of atoms from which the formula of an ionic compound can be established is called a(n).
Which is an advantage if sexual reproduction over asexuals reproduction A. Increased number of organisms and decreased genetic variation
B. Increased genetic variation
C. Doesn’t require an organism to find a mate
D. Decreased genetic variation
E. Decreased genetic variation and decreased number of organisms
Which of these is a physical property? A) ability to burn a piece pf paper B) pure sodium reacts violently with water C) the boiling point of water is 100° C D) Helium does not tend to react with anything
Boiling of water at 100°C is a physical change as there is no change in the chemical composition of water only it's state changes.What are physical changes?
Physical changes are defined as changes which affect only the form of a substance but not it's chemical composition. They are used to separate mixtures in to chemical components but cannot be used to separate compounds to simpler compounds.
Physical changes are always reversible using physical means and involve a change in the physical properties.Examples of physical changes include melting,boiling , change in texture, size,color,volume and density.Magnetism, crystallization, formation of alloys are all reversible and hence physical changes.
They involve only rearrangement of atoms and are often characterized to be changes which are reversible.
Learn more about physical changes,here:
It's C the boling point to water is 100° C
A solution with a ph of 4 has _________ the concentration of h+ present compared to a solution with a ph of 5.