1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
vivado [14]
3 years ago
9

Humans are most abundant during which geological era?

Chemistry
1 answer:
emmainna [20.7K]3 years ago
8 0

Answer:

Cenoizic

Precamborian

You might be interested in
Identify all the examples that support the Law of Conservation of Mass through chemical changes.
wariber [46]

Answer:

B

C

Explanation:

7 0
3 years ago
Read 2 more answers
Identify reagents necessary to convert cyclohexane into 1,3-cylohexadiene: notice that the starting material has no leaving grou
Vinvika [58]
<span>1,3-cylohexadiene i synthesized starting from cyclohexane in following 4 steps.

1) Free Radical Substitution Rxn:
 Halogenation of cyclohexane in the presence of UV yield chlorocyclohexane.

2) Elimination Rxn: Dehydrohalogenation of chlorocyclohexane yields cyclohexene.

3) Halogenation of Cyclohexene (Electrophillic Addition Rxn) gives 1,2-dihalocyclohexane.

4) Elemination Rxn: When dibromocyclohexane is treated with KOH and heated it gives 1,3-cyclohexadiene as shown below,</span>

4 0
3 years ago
Is melting point and boiling point chemical changes or physical changes?
mrs_skeptik [129]
Boiling water results in no chemical change. If water is just heated to its boiling temperature then there is a physical change.
4 0
3 years ago
Read 2 more answers
How many moles are in 458 grams of na2so4
shtirl [24]

# moles = mass (g) / Mr (relative atomic mass)

# moles = 458 / ((23*2)+32+(16*4)

# moles= 458 /  142 = 3.2253521126760...

= 3.23 moles

5 0
3 years ago
Which is an example of a covalent bond? Chlorine accepts an electron from calcium to form a stable bond. Ions in a bar of pure i
Ivenika [448]
Chlorine + Calcium --> Ionic Bond
Iron cannot covalently bond as it is a metal
4 0
3 years ago
Read 2 more answers
Other questions:
  • How many moles of water are In 44.99 grams
    12·1 answer
  • By paying low wages, factory owners were able to
    9·1 answer
  • The picture below shows a warm air mass caught between two cooler air masses. What is this type of front called??
    8·1 answer
  • A ________ is an electric circuit that produces a magnetic field
    13·1 answer
  • What is 0.045 rounded to the nearest hundredth?
    13·2 answers
  • Which of the following is separated by physical mean.?
    13·2 answers
  • What happens to a person's weight on smaller and larger planets?
    14·1 answer
  • Ammonia is oxidized with air to form nitric oxide in the first step of the production of nitric acid. Two principal gas-phase re
    14·1 answer
  • Question 2 (1 point)
    15·1 answer
  • Four difference between electrolytic cell and electrochemical cell​
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!