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
lukranit [14]
3 years ago
10

1. Hydrogen, Helium, Lithium?

Chemistry
1 answer:
Reika [66]3 years ago
6 0

Answer:

what happened to it, have the gone extinct

You might be interested in
What types of waves are produced by a jackhammer?
fomenos
Options? I'm thinking P Waves.

4 0
3 years ago
Read 2 more answers
What the equipment of diffusion?​
I am Lyosha [343]

Answer:

liquid

a semi permeable membrane

oxygen

Explanation:

plz give me brainiest

5 0
2 years ago
A Carnot cycle operates between the temperatures limits of 400 K and 1600 K, and produces 3600 kW of net power. The rate of entr
TiliK225 [7]

The rate of entropy change:

The rate of entropy change of the working fluid during the heat addition process is 3 kW/K

What is the Carnot cycle?

  • The Carnot Cycle is a thermodynamic cycle made up of reversible isothermal expansion, adiabatic expansion, isothermal compression, and adiabatic compression processes in succession.
  • The ratio of the heat absorbed to the temperature at which the heat was absorbed determines the change in entropy.

The entropy of a system:

The rate of heat addition is expressed as,

Q = \frac{WT_{H}}{T_{H}- T_{L}}

The entropy of a system is a measure of how disorderly a system is getting. The rate of entropy generation during heat addition is,

S_{gen} = \frac{Q}{T_{H}} = \frac{W}{T_{H} - T_{L}}

Calculation:

<u>Given:</u>

T_{L} = 400K

T_{H} = 1600K

W = 3600 kW

Put all the values in the above equation, and we get,

S_{gen} = \frac{W}{T_{H} - T_{L}} = \frac{3600}{1600-400} = 3 kW/K

The rate of entropy change is 3 kW/K

Learn more about the Carnot cycle here,

brainly.com/question/13002075

#SPJ4

3 0
2 years ago
3. the closeness of a measurment to its true value is a measure of its ____ ?
valkas [14]
The closeness of a measurement to its true value is a measure of its Accuracy.
4 0
3 years ago
The size (radius) of an oxygen molecule is about 2.0 ×10−10m. Make a rough estimate of the pressure at which the finite volume o
belka [17]

Answer:

Explanation:

We can calculate the volume  of the oxygen molecule as the radius of oxygen molecule is given as 2×10⁻¹⁰m.

We know that volume=4/3×πr³

volume =4/3×π(2.0×10⁻¹⁰m)³

volume=33.40×10⁻³⁰m³

Volume of oxygen molecule=33.40×10⁻³⁰m³

we know the ideal gas equation as:

PV=nRT

k=R/Na

R=k×Na

PV=n×k×Na×T

n×Na=N

PV=Nkt

p is pressure of gas

v is volume  of gas

T is temperature of gas

N is numbetr of molecules

Na is avagadros number

k is boltzmann constant =1.38×10⁻²³J/K

R is real gas constant

So to calculate pressure using the  formula;

PV=NkT

P=NkT/V

Since there is only one molecule of oxygen so N=1

P=[1×1.38×10⁻²³J/K×300]/[33.40×10⁻³⁰m³

p=12.39×10⁷Pascal

8 0
3 years ago
Other questions:
  • need help in getting a element superhero and the element i choose is Helium can you give me some ideas of a superhero to make us
    11·1 answer
  • Do bases contain hydrogen ions (H+)
    11·1 answer
  • Which reaction takes place in a nuclear fission reactor?
    15·2 answers
  • What has the study or fossils allowed scientists to do ?
    5·2 answers
  • The chemical formula tells the types of atoms and how many of each are contained in a compound. Please select the best answer fr
    14·1 answer
  • Which best describes a role of animal in the water cycle
    12·2 answers
  • Which formula contains a metal and a nonmetal? SO2 MgO CO H2O
    15·2 answers
  • A 3.0 L solution contains 73.5 g of H2SO4. Calculate the molar concentration of the solution.
    6·2 answers
  • Which statement about the half-life of a radioactive sample is true?
    11·2 answers
  • Please help Please Help
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!