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
GrogVix [38]
2 years ago
12

Why does a star expand into a red giant?​

Chemistry
1 answer:
devlian [24]2 years ago
7 0

Answer:

"Hydrogen is still available outside the core, so hydrogen fusion continues in a shell surrounding the core. The increasingly hot core also pushes the outer layers of the star outward, causing them to expand and cool, transforming the star into a red giant."

You might be interested in
I Need help ASAP!
8090 [49]

Answer:

The correct answers are:

• Softer, porous, or more permeable rocks weather faster than harder rocks.

• Rocks in warmer climates weather faster than rocks in colder climates.

• The more water present, the faster the rate of weathering.

Explanation:

Weathering is the process through which the surface minerals of rock are broken down and loosened. This occurs through the action of extreme temperatures, rainwater and biological activity.

Hope this helps- Good luck ^w

4 0
2 years ago
Read 2 more answers
_ As + _ NaOH → _Na3AsO3 + _H2
Ksivusya [100]
Yesssssssssssssssssssssss
3 0
3 years ago
A 1.0l buffer solution contains 0.100 mol of hc2h3o2 and 0.100 mol of nac2h3o2. the value of ka for hc2h3o2 is 1.8×10−5. part a
Mandarinka [93]
There are two ways to solve this problem. We can use the ICE method which is tedious and lengthy or use the Henderson–Hasselbalch equation. This equation relates pH and the concentration of the ions in the solution. It is expressed as

pH = pKa + log [A]/[HA] 

 where pKa = - log [Ka]
[A] is the concentration of the conjugate base
[HA] is the concentration of the acid

Given:
Ka = 1.8x10^-5
NaOH added = 0.015 mol
HC2H3O2 = 0.1 mol
NaC2H3O2 = 0.1 mol

Solution:
pKa = - log ( 1.8x10^-5) = 4.74

[A] = 0.015 mol + 0.100 mol = .115 moles
[HA] = .1 - 0.015 = 0.085 moles

pH = 4.74 + log (.115/0.085)
pH = 4.87
6 0
3 years ago
A chemistry student is given 600. mL of a clear aqueous solution at 37.° C. He is told an unknown amount of a certain compound X
barxatty [35]

Answer:

  • <u>Yes, it is 14. g of compound X in 100 ml of solution.</u>

Explanation:

The relevant fact here is:

  • the whole amount of solute disolved at 21°C is the same amount of precipitate after washing and drying the remaining liquid solution: the amount of solute before cooling the solution to 21°C is not needed, since it is soluble at 37°C but not soluble at 21°C.

That means that the precipitate that was thrown away, before evaporating the remaining liquid solution under vacuum, does not count; you must only use the amount of solute that was dissolved after cooling the solution to 21°C.

Then, the amount of solute dissolved in the 600 ml solution at 21°C is the weighed precipitate: 0.084 kg = 84 g.

With that, the solubility can be calculated from the followiing proportion:

  • 84. g solute / 600 ml solution = y / 100 ml solution

      ⇒ y = 84. g solute × 100 ml solution / 600 ml solution = 14. g.

The correct number of significant figures is 2, since the mass 0.084 kg contains two significant figures.

<u>The answer is 14. g of solute per 100 ml of solution.</u>

7 0
2 years ago
A propane torch is lit inside a hot air balloon during preflight preparations to inflate the balloon.
Nataliya [291]

Answer: its pressure

Explanation: just trust me

7 0
3 years ago
Read 2 more answers
Other questions:
  • Differentiated animal cells and tissues include _____.
    14·1 answer
  • The nucleus of an atom contains at least one<br> proton.<br> True or false
    9·1 answer
  • predict where an unknown element that has these properties could fit in the periodic table 62 protons and electrons
    10·1 answer
  • At what Celsius temperature does 0.750 mol of an ideal gas occupy a volume of 35.9 L at 114 kPa?
    6·1 answer
  • the directions in the candy recipe for pralines instruct the cook to remove the pot containing the candy mixture from the heat w
    15·1 answer
  • Compared to the nonmetals in Period 2, the metals in Period 2 generally have larger
    15·1 answer
  • Why do you think the molarity relationship is so important to the chemist?
    7·1 answer
  • Help I WILL AWARD BRAINLIEST
    15·2 answers
  • If 0.400 moles CO and 0.400 moles O2 completely react how many grams of CO2 are produces?
    5·1 answer
  • Investigate Weathering and Erosion 1. Describe at least one part of the experimental procedure that you thought was essential to
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!