CHEMISTRY HIGH SCHOOL

Hydrogen and helium in the universe were formed by which of these phenomena?a. Big bang
b. Fusion in small stars
c. Fusion in very large stars
d. Supernova

Answers

Answer 1
Answer: I think the answer is a

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Which of the following is equivalent to 3.2 mg?a
3.2 x 10-15 ug
b 3.2 x 1015 ug
С
3.2 x 10-3 ug
d
3.2 x 10'ug

Answers

Answer:

The options are not really clear, however, the answer is 3.2 × 10^3ug

Explanation:

Milligram (mg) and microgram (ug) are interconvertible measurements of mass or weight. One microgram (ug) is a millionth gram while one milligram (mg) is a thousandth gram.

Hence, one milligram is a thousandth microgram i.e. 1 mg = 1000 ug

Therefore, a measurement of 3.2mg in ug will be; 3.2 × 1000

= 3200

= 3.2 × 10^3 ug

Hence, an equivalent measurement of 3.2mg is 3.2 × 10^3ug.

The equivalent of 3.2 mg is 3.2 x 10^-3 ug. Therefore, the correct answer is option c.

3.2 mg stands for 3.2 milligrams.

The prefix "milli-" means one-thousandth (1/1000), so 1 milligram (mg) is equal to 0.001 grams (g).

To convert milligrams (mg) to micrograms (ug), we use the following conversion factor:

1 mg = 1000 ug

So, for 3.2 mg:

3.2 mg * 1000 ug/mg = 3200 ug

Now, to express this in scientific notation, we can write it as:

3200 ug = 3.2 x 10^3 ug

So, the correct equivalent of 3.2 mg is indeed:

c) 3.2 x 10^-3 ug

therefore, The correct answer is option c.

Learn more about Unit Conversion here:

brainly.com/question/32030244

#SPJ3

2. The energy of a photon that has a wavelength of 12.3 nm is _______ J.A) 2.72 x 10^-50
B) 1.62 x 10^-17
C) 4.42 x 10^-23
D) 1.99 x 10^-25
E) 1.51 x 10^-17

Answers

I think it is e sorry if I’m wrong

How will the vapor pressure of an aqueous solution of sodium chloride compare to that of pure water?

Answers

The vapor pressure of a compound refers to the pressure generated by the vapour of a compound in equilibrium with its condensed stage. The major determinant of a compound vapour pressure is temperature. The vapour pressure of an aqueous solution of sodium chloride will be lower than that of pure water. This is because, dissolution of solute in a solvent always reduces the vapour pressure of the solution as a result of interactions between the molecule of the solute and the solvent. Thus, a pure compound will always have a higher vapour pressure than a solution.
The solutions vapor pressure would be lower.

Please help me, please

Answers

Answer:

A. Metal

Explanation:

Hope this helps! :)

If this wasn't what you were looking for please don't hesitate to comment again! Have a nice day/night! :)

Answer:

Metal

Explanation:

they deleted my answer so I am putting it back sorry

H2(g) + CO2(g) + 10 kcal H2O(g) + CO(g)In another experiment involving the above reaction at 1,000°C, the equilibrium concentrations were found to be:

H2(g) = 2.0 moles per liter
H2O(g) = 4.0 moles per liter
CO2(g) = 5.0 moles per liter
CO(g) = 4.0 moles per liter

What is the equilibrium constant, Keq, for this reaction?

Answers

The equilibrium contant for the reaction is 1.6. Solution: [H2]=2.0 mol/L [CO2]= 5.0 mol/L [H2O]= 4.0 mol/L [CO]= 4.0 mol/L K = [H2O][CO] / [H2][CO2] K = (4.0)(4.0) / (2.0)(5.0) K = 1.6 Ans [ =1.6 ]

This type of heat transfer is trapped in green houses. Conduction, Convection, Or Radiation and why is it conduction, convection, or radiation?

Answers

This transfer is radiation. This type of heat transfer is composed of electromagnetic waves from the Sun either through infrared or ultraviolet rays. Radioactive heat transfer is the only way to transfer heat from one place to another without a medium.

Answer:

infrared radiation

Explanation:

Light from the Sun passes through the glass roof to heat plants and the ground inside the greenhouse. These objects then emit infrared radiation, which is absorbed in the glass roof. Thermal energy is trapped in the greenhouse, keeping the building warm.
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In the reaction Mg (s) + 2HCl (aq) H2 (g) + MgCl2 (aq), how many grams of hydrogen gas will be produced from 125.0 milliliters of a 6.0 M HCl in an excess of Mg?