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
Inessa [10]
3 years ago
15

In which era did the first fish appear?

Chemistry
1 answer:
VARVARA [1.3K]3 years ago
5 0
C Because Mesozoic Is An Era The First Fish Seen
You might be interested in
Which process is caused by an increase in thermal energy
Over [174]

Answer:

They're different - heat and thermal energy. ... The heat, in turn, speeds up the molecules within the pot and the water. If you place a thermometer in the water, as the water heats up, you can watch the temperature rise. Again, an increase in internal energy will result in an increase in temperature.

8 0
3 years ago
Please help: A 0.200 M NaOH solution was used to titrate a 18.25 mL HF
algol [13]

The molar concentration of the original HF  solution : 0.342 M

Further explanation

Given

31.2 ml of 0.200 M NaOH

18.2 ml of HF

Required

The molar concentration of HF

Solution

Titration formula

M₁V₁n₁=M₂V₂n₂

n=acid/base valence (amount of H⁺/OH⁻, for NaOH and HF n =1)

Titrant = NaOH(1)

Titrate = HF(2)

Input the value :

\tt 0.2\times 31.2\times 1=M_2\times 18.25\times 1\\\\M_2=0.342

7 0
3 years ago
Which technique would be best for separating sand and water?
ipn [44]

Answer:

A. filtration

Hope it helps

3 0
3 years ago
Elements that exceed the octet rule must have an _______________. unoccupied s-orbital unoccupied p-orbital unoccupied d-orbital
Irina18 [472]
Elements that exceed the octet rule must have an unoccupied d orbital. I believe.
7 0
4 years ago
The monoprotic acid from among the following is
oksian1 [2.3K]

Monoprotic acid are acids having only one hydrogen atoms after dissociation into ions from its compound. The monoprotic acid from among the following is HCl. The answer is letter D. HCl → H+ + Cl-. Note that there is only one H+ ion upon dissociation.

3 0
3 years ago
Read 2 more answers
Other questions:
  • Write the formula and name of the compound formed from the following ionic interactions:
    13·1 answer
  • Use electron transfer or electron shift to identify what is oxidized and what is reduced in each reaction :
    5·2 answers
  • . Mitosis allows one cell to grow and split into 2 new cells. Will those 2 new cells split again explain.
    9·1 answer
  • Which one of the following equations represents the net ionic equation for the reaction between aqueous potassium chloride and a
    7·1 answer
  • Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.
    9·1 answer
  • Calculate the mass of 29.8 mL of aluminum, which has a density of 2.00 g/mL.
    7·1 answer
  • In a first-order decomposition reaction. 58.6% of a compound decomposes in 11.7 min. How long (in min) does it take for 80.2% of
    10·1 answer
  • A wave transfers from one place to another
    6·2 answers
  • Need help with this science question............
    15·1 answer
  • The phase change that occurs when a liquid goes to a gas?
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!