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shusha [124]
3 years ago
6

What does the survival of the fittest mean

Chemistry
1 answer:
Tomtit [17]3 years ago
7 0
It means that the fit and well adjusted ones thrive and "make it", and the weak ones that can't adapt die.
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Where are the rare earth metals located on the periodic table
maksim [4K]
They are found in group 3 of the periodic table.
7 0
3 years ago
Calculate the molecular formula of a compound with the empirical formula C5H11 and a molar mass of 142.32 grams/mole
MA_775_DIABLO [31]
Relative formula mass C₅H₁₁ = 71

Now divide the molar mass by the RFM = 142.32 / 71 = 2

Now C₍₅ₓ₂₎H₍₁₁ₓ₂) = C₁₀H₂₂

Hope that helps
6 0
3 years ago
Which of the following statements describes a difference between a chemical change and a physical change in a substance
siniylev [52]

Explanation:

A physical change is one that alters the physical properties of matter (particularly the form and state).

A chemical change is one in which new kind of matter is formed. It is always accompanied by energy changes (evolution or absorption of energy in form of heat or light or both).

Now, the salient differences between physical and chemical changes;

  1. Physical changes are easily reversible whereas chemical changes are not easily reversible.
  2. Physical changes lead to the production of no new kinds of matter whereas chemical changes leads to the production of new kinds of matter.
  3. Physical changes involves no change in mass whereas chemical changes involves change in mass.
  4. Physical changes require little energy whereas considerable amount of energy is needed for chemical changes.
8 0
3 years ago
A speed time graph shows that a car moves at 20 m/s for 15s. The car's speed steadily decreases until it comes to a stop at 40s.
ladessa [460]
0s to 15s: constant speed/zero acceleration
15s to 40s: constant gradient, therefore constant deceleration
4 0
2 years ago
Given the reaction that occurs in an electrochemical cell:
KatRina [158]

Answer:

c) +2 to 0

Explanation:

SO4 has a charge of -2, so the Cu attached to that has to be a +2 since the polyatomic molecule has no overall charge

Cu(s) is a solid metal and they have no charge, therefore it is zero

Copper undergoes Oxidation (gain of electrons)

8 0
3 years ago
Read 2 more answers
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