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
Irina18 [472]
3 years ago
5

Please help really soon (I'm confused) :|

Chemistry
2 answers:
gladu [14]3 years ago
5 0
Nitrogen, and oxygen because they are in highest ratios
Yanka [14]3 years ago
4 0

Answer: carbon dioxide was replaced with oxygen

Explanation:Comparison of Earth's prebiotic and modern atmospheres. Before life began on the planet, Earth's atmosphere was largely made up of nitrogen and carbon dioxide gases. After photosynthesizing organisms multiplied on Earth's surface and in the oceans, much of the carbon dioxide was replaced with oxygen

You might be interested in
Please help ASAP
DochEvi [55]
Aluminum. chemical element with symbol Al
4 0
3 years ago
Create and balance a chemical equation for the following statement.
m_a_m_a [10]
FeCl₂  +  2NH₄OH  →  Fe(OH)₂  +  2NH₄Cl
8 0
3 years ago
Which type of energy uses the photoelectric effect?
ikadub [295]

Answer:

My lovely people the answer is SOLAR

Explanation:

i just know

8 0
2 years ago
The molar heat of fusion of gold is 12.550 kJ mol–1. At its melting point, how much mass of melted gold must solidify to release
KATRIN_1 [288]

The mass of melted gold to release the energy would be  3, 688. 8 Kg

<h3>How to determine the mass</h3>

The formula for quantity of energy is given thus;

Q = n × HF

Where n represents number of moles

HF  represents  heat of fusion

To find the number of moles, we have

235.0 = n × 12.550

number of moles = \frac{235}{12. 550} = 18. 725 moles

Note that molar mass of Gold is 197g/ mol

Let's note that;

Number of moles = mass/ molar mass

Mass = number of moles × molar mass

Mass = 18. 725 × 197

Mass = 3, 688. 8 Kg

Thus, the mass of melted gold to release the energy would be  3, 688. 8 Kg

Learn more about molar heat of fusion here:

brainly.com/question/15634085

#SPJ1

8 0
1 year ago
On Darwin's tree of life, organisms at the base of
masya89 [10]
B - Evolve into the closest species on the tree’s trunk
3 0
2 years ago
Read 2 more answers
Other questions:
  • Help me, I don’t understand
    13·2 answers
  • Question 1 a chemist dissolves 154.mg of pure hydrochloric acid in enough water to make up 170.ml of solution. calculate the ph
    11·1 answer
  • I don’t understand this, can you help me?
    8·1 answer
  • What is the difference between mass and weight in detail?
    6·1 answer
  • Can you help.me this above question. ..​
    14·1 answer
  • (5 x 10 4) + (2.5 x 10 2) =<br> 2 x 10 2<br> 12.5 x 10 2<br> 0.5 x 10 6<br> 5 x 106
    15·1 answer
  • Which best describes the effect of J. J. Thomson’s discovery?
    13·1 answer
  • A gas sample has a volume of 222 mL at 55.0 °C and 100.0 kPa pressure. Find the volume at
    8·1 answer
  • Aqueous hydrochloric acid will react with solid sodium hydroxide to produce aqueous sodium chloride and liquid water . Suppose 1
    11·1 answer
  • when a reactive metal is added to water, bubbles or fizzing can be observed. Explain the appearance of the bubbles​
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!