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
Molodets [167]
3 years ago
9

Humans first appeared in the _____ period.

Chemistry
2 answers:
Ira Lisetskai [31]3 years ago
6 0

Answer:

They first appeared in the fossil record around 66 million years ago, soon after the Cretaceous–Paleogene extinction event that eliminated about three-quarters of plant and animal species on Earth, including most dinosaurs.

Explanation:

vlabodo [156]3 years ago
4 0

Answer:

A or b I learned this in history

You might be interested in
Which of the following is not true of carbon?
photoshop1234 [79]

We have to know which of the given statement is not true of carbon.

Not true statement of carbon is - it forms strong ionic bonds.

It can not form ionic bond. to produce ionic bond, carbon has to be converted into either C⁴⁺ or C⁴⁻.

The electronic configuration of C-atom is 1s²2s²2p⁴.

To form C⁴⁺ cation, four electrons must be removed from outermost shell of carbon atom which requires huge energy to supply.

To form C⁴⁻ anion, four electrons must be added to outermost shell of carbon atom which is not possible as outermost shell of C-atom does not have 2d orbital to accommodate extra electrons.

6 0
3 years ago
The density of gold is 19.3 grams per cubic centimeter. What is the mass of a bar of gold that measures 15.24 cm in length, 10.1
kumpel [21]

Answer:

40.75

Explanation:

15.24   ×   5.08   ×   10.16 =786.579072

786.579072/19.3=40.75

4 0
3 years ago
QuODUUII IU VI<br> 2 Points<br> What is molarity?
Julli [10]

Answer:

Molarity is similar to Concentration

Explanation:

Molarity (M) is the amount of solute in a solvent, similar to concentration.

5 0
4 years ago
Read 2 more answers
The circle on the left shows a magnified view of a very small portion of liquid water in a closed container. What would the magn
vovangra [49]
Once the water evaporates, you will start to see the minerals that were present in the water before it changed state. If the water was from the ocean, you will see salt crystals in the evaporated water. If the water was fresh, you may see other minerals typically found in fresh water.
8 0
3 years ago
Read 2 more answers
If a 1.45 M solution has 2.43 g HCl dissolved, what is the volume of solution? (Change g Hl into mol using molar mass)
GrogVix [38]

Answer: 0.0459

Explanation:

3 0
3 years ago
Other questions:
  • What is the empirical formula for a compound that contains 0.0134 g of iron, 0.00769 g of
    13·1 answer
  • Butane (c4 h10(g), hf = –125.6 kj/mol) reacts with oxygen to produce carbon dioxide (co2 , hf = –393.5 kj/mol ) and water (h2 o,
    14·2 answers
  • A student reacted NiS2 (MM = 122.83 g/mol) with O2 (MM=32.00 g/mol) to make SO2 (MM=64.07 g/mol) according to this balanced equa
    9·1 answer
  • A rock has a mass of 210 grams and occupies a volume of 70 cm3. What is its density?
    10·1 answer
  • It rate of effusion of a particular gas was measured and found to be 24.0 ml/min. under identical conditions the rate of effusio
    9·1 answer
  • What is the mass percentage of JUST water in the hydrate CuSO4 ∙5H2O? The molar mass for the whole compound is 249.71 g/mol.
    14·1 answer
  • Label the layers of the earth
    8·1 answer
  • who wants to be my pen pal if you want to know what that is it means a person who writes letters to each other.
    5·2 answers
  • El acido nitrico se obtiene industrialmente por oxidacion de amoniaco (nh3), de acuerdo con la ecuacion: 4nh3 + 702 - h2o + hno2
    15·1 answer
  • What does a line of best fir shows you in a a scatee plot
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!