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3 years ago

Which element was first discovered in space before it was discovered on Earth?

2 answers:

8 0

Helllllooo Friend __________________________:-) :-):-) :-)

©©©©©here is your answer©©©©©

Helium is named from the Greek helios, "the Sun", where the element was discovered through spectroscopy.

Hope this answer help you!!!!!!!!!!! :-) :-) :-) :-) :-) :-)

faltersainse [42]3 years ago

7 0

Helium was first discovered in space before it was on earth

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Calculate the final Celsius temperature when 634 L at 21 °C is compressed to 307 L.

Illusion [34]

Answer:

- 130.64°C.

Explanation:

We can use the general law of ideal gas: PV = nRT.

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

If n and P are constant, and have two different values of V and T:

V₁T₂ = V₂T₁

V₁ = 634.0 L, T₁ = 21.0°C + 273 = 294.0 K.

V₂ = 307.0 L, T₂ = ??? K.

∴ T₂ = V₂T₁/V₁ = (307.0 L)(294.0 K)/(634.0 L) = 142.36 K.

∴ T₂(°C) = 142.36 K - 273 = - 130.64°C.

5 0

4 years ago

What two parts of an amino acid are involved in a peptide bond?

Lemur [1.5K]

Answer:

The answer to your question is below.

Explanation:

Amino acids are composed by one amino group, one carboxyl group and one chain.

The parts of the amino acid that are involved in a peptide group are the amino group (- NH₂) and the carboxyl group (-COOH).

6 0

3 years ago

the equilibrium concentration of hydroxide ion in a saturated iron(ii) hydroxide solution is 1.2 x 10^-5 M at a certain temperat

Anit [1.1K]

From the calculation as shpwn in the procedure below, the equilibrium constant of the substance is 6.9 * 10^-15.

<h3>What is equilibrium constant?</h3>

The equilibrium constant for the solubility of aa solid in solution is called the solubility product Ksp. The Ksp shows the extent to which a solid is dissolved in solution.

Given that;

Fe(OH)2 ⇄Fe^2+ + 2(OH)^-

Ksp = s(2s)^2

We have s as 1.2 x 10^-5 M

Ksp = 4s^3

Ksp = 4( 1.2 x 10^-5 )^3

Ksp = 6.9 * 10^-15

Learn more about Ksp:brainly.com/question/27132799

#SPJ1

8 0

2 years ago

Analyze complete and balance the following equation co2(g)+hcl(aq)

Anna007 [38]

Answer:

$CO_{2} (g)+4HCl(aq)->2H_{2} O(g)+CCl_{4} (g)$

This is a double displacement reaction, C goes with Cl in the products side and O2 goes with H. All that is left is to balance the equation, making sure each side has equal amounts of atoms.

4 0

3 years ago

Which of the following occurs when sodium and chlorine bond together to form sodium

Mumz [18]

(a) chlorine gains an electron from a sodium atom

7 0

2 years ago