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
erik [133]
3 years ago
7

How me and other scientists know about animals that went extinct for million people million of years ago

Chemistry
1 answer:
Natalija [7]3 years ago
6 0
The answer is fossils. they find and study them
You might be interested in
What type(s) of bond(s) does carbon have a tendency to form?
Naily [24]
Carbon has a tendency to form covalent bonds.
4 0
3 years ago
An ion with a -2 charge has? A) one missing protein B) two missing protons c) two missing electrons D) two extra electrons
Andreyy89

Answer:

D.

Explanation:

It would not be gain because it would say +6 instead of -2. Having a -2 charge means it wants to loose 2 electrons so it can form a full shell of 8 electrons. It wants to be inert (stable).

- Hope that helps! Please let me know if you need further explanation.

3 0
3 years ago
Read 2 more answers
C4H9OH(g)+O2(g)→CO2(g)+?H2O(l) what coefficient should be placed in front of H2O to balance the hydrogen atoms?
slava [35]

Answer:

5

Explanation:

To balance the hydrogen atoms, we check the number of hydrogen on the left side, this is equal to the 10 hydrogen atoms we have in the alkanol.

Now, on the right hand side, we can see we only have two hydrogen atoms in the water molecule. Now, to make equal the number of hydrogen atoms on both sides, we simply multiply the number of hydrogen there by 5 to make it 10 too

3 0
3 years ago
How many hydrogen atoms are found in the<br> hydrate (NH4)3PO4.5H2O?
igomit [66]

Answer:

22

Explanation:

3x4+  5x2

3 0
3 years ago
(a) Given that Ka for acetic acid is 1.8 X 10^-5 and that for hypochlorous acid is 3.0 X 10^-8, which is the stronger acid? (b)
Gala2k [10]

Answer:

HOAc is stronger acid than HClO

ClO⁻ is stronger conjugate base than OAc⁻

Kb(OAc⁻) = 5.5 x 10⁻¹⁰

Kb(ClO⁻) = 3.3 x 10⁻⁷

Explanation:

Assume 0.10M HOAc => H⁺ + OAc⁻  with Ka = 1.8 x 10⁻⁵

=> [H⁺] = √Ka·[Acid] =√(1.8 x 10⁻⁵)(0.10) M = 1.3 x 10⁻³M H⁺

Assume 0.10M HClO => H⁺ + ClO⁻ with Ka = 3 x 10⁻⁸

=> [H⁺] = √(3 x 10⁻⁸)(0.10)M = 5.47 x 10⁻⁵M H⁺

HOAc delivers more H⁺ than HClO and is more acidic.

Kb = Kw/Ka, Kw = 1 x 10⁻¹⁴

Kb(OAc⁻) = 5.5 x 10⁻¹⁰

Kb(ClO⁻) = 3.3 x 10⁻⁷

4 0
3 years ago
Other questions:
  • Which of the following best describes how wireless telephones are able to receive and produce sound from one person to another?
    8·1 answer
  • Everything to know about on acids and alkalines plz help me !!!
    5·1 answer
  • A student chromatographs a mixture and after developing the spots with a suitable reagent he observes the following
    12·1 answer
  • The periodic table tells you how many grams are in a mole of atoms of any
    11·1 answer
  • Which of the following is a behavioral adaptation of the Venus fly trap? A. leaves that close when touched B. leaves that perfor
    13·1 answer
  • Magnesium and nitrogen react to form magnesium nitrate. Which of the following expressions represents this chemical reaction?
    6·1 answer
  • If you took a spoonful of tea out of the cup, which would be more painful if it spilled on you? *
    14·1 answer
  • 5. Which state(s) of matter |s/ar epsilon easily compressible? Select all that apply.
    9·1 answer
  • 9. How do airbags protect the occupants of a car in a crash? Use the following words in
    15·1 answer
  • A warm front is heading toward Chicago. Which type of weather would one expect when it arrives?
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!