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
Rina8888 [55]
2 years ago
14

What do astronomers use to calculate the age of the universe? Check all that apply. dark energy the age of rocks on Earth the ag

e of the oldest stars patterns of background radiation how fast distant galaxies are moving away from us
Chemistry
2 answers:
Hitman42 [59]2 years ago
4 0

The answers are:

The age of the oldest stars

How fast distant galaxies are moving away from us

Patterns of background radiation

Using these techniques, and using the Big Bang as reference point, astronomers estimate that the universe may be approximately 12 billion years old.


Likurg_2 [28]2 years ago
4 0

the age of the oldest stars

patterns of background radiation

how fast distant galaxies are moving away from us

You might be interested in
How does Gibbs free energy predict spontaneity?
Kaylis [27]

Answer:

Gibbs equation helps us to predict the spontaneity of reaction on the basis of enthalpy and entropy values directly. When the reaction is exothermic, enthalpy of the system is negative making Gibbs free energy negative. Hence, we can say that all exothermic reactions are spontaneous.

5 0
2 years ago
Sandy puts a paper clip on the table. Then, she puts a magnet near the paperclip. The paperclip begins to move.
Akimi4 [234]
Applied forces/or unbalanced:i hope that helps you
3 0
3 years ago
Read 2 more answers
Where does photosynthesis occur in a plant cell? In what part of a plant cell does photosynthesis occur?
Lynna [10]

Explanation:

In plants, photosynthesis takes place in chloroplasts, which contain the chlorophyll.

3 0
2 years ago
Read 2 more answers
The value of ΔH° for the reaction below is -6535 kJ. ________ kJ of heat are released in the combustion of 16.0 g of C6H6 (l)?
Umnica [9.8K]

Answer:

the value of H° is below -6535 kj. +6H2O

Explanation:

6H2O answer solved

3 0
2 years ago
the reaction of aluminum with chlorine gas is shown 2Al + 3Cl2 -> 2AlCl3 based on this equation how many molecules of chlorin
Vanyuwa [196]

45 molecules of chlorine gas (Cl₂) are needed to react with 30 atoms of aluminum (Al)

The balanced equation for the reaction is given below:

2Al + 3Cl₂ —> 2AlCl₃

From the balanced equation above,

2 atoms of Al required 3 molecules of Cl₂.

With the above information, we can determine the number of molecules of Cl₂ needed to react with 30 atoms of Al. This can be obtained as follow:

From the balanced equation above,

2 atoms of Al required 3 molecules of Cl₂.

Therefore,

30 atoms of Al will require = \frac{30 * 3}{2}\\ = 45 molecules of Cl₂.

Thus, 45 molecules of chlorine gas (Cl₂) are needed to react with 30 atoms of aluminum (Al)

Learn more: brainly.com/question/24918379

3 0
2 years ago
Other questions:
  • Which of the following has the ability to turn light energy into chemical energy? A. a generator B. an automobile C. a tree D. w
    13·2 answers
  • Which nuclear emission is negatively charged?
    13·2 answers
  • A 40.27 g sample of a substance is initially at 24.8 °c. after absorbing 2099 j of heat, the temperature of the substance is 148
    13·1 answer
  • 15 pts The drop down items have the same options for all sections labeled choose an item
    5·1 answer
  • A model used for the yield Y of an agricultural crop as a function of the nitrogen level N in the soil (measured in appropriate
    10·1 answer
  • Write a balanced half-cell equation for the reaction occurring at the anode. ignore phases in the reaction.
    5·1 answer
  • How many silver atoms are there in 3.76g of silver?​
    10·1 answer
  • Determine The Oxidation Number for
    13·1 answer
  • Organic acids are weaker than inorganic once it is true or false​
    7·2 answers
  • The solubility for KCl is 60 g at 40 C. If a solution of KCl contains 79.5 g, is the solution saturated, unsaturated, or supersa
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!