CHEMISTRY HIGH SCHOOL

According to the big bang theory, approximately when did the universe begin?4 billion years ago
7 billion years ago
11 billion years ago
13 billion years ago

Answers

Answer 1
Answer:

The correct answer is 13 billion years ago.  

The Big Bang theory is the existing cosmological model for the apparent universe from the most primitive known periods via its consequent large scale evolution. The model illustrates that how the expansion of the universe took place from a very high temperature and high-density state and provides a complete illustration for a wide array of processes comprising the existence of cosmic microwave background, light elements, Hubble's law, and large scale structure.  

The complete measurements of the rate of expansion of the universe put the Big Bang at approximately 13.8 billion years ago, that is, thus regarded as the age of the universe.  
Answer 2
Answer: According to the big bang theory it would be around 13 billion years ago.

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How many moles of I2 are in 8.23 moles of NaI ?

Answers

Answer: 4.12

Explanation:

we know that the given mol is 8.23 mol and they are 2NaI and I2 so we will write the equation like this.

8.23mol NaI x 1mol of I2 ÷ 2molNaI = 4.115≅ 4.12 mol of I2

we placed NaI at the bottom to cancel out with the 8.23 mol of NaI

Which scientist invented a model of the atom that most closely resembles the modern electron cloud model?j.j. Thomson

Niels Bohr

Ernest Rutherford

John Dlaton

Answers

Neil Bohr is the scientist who  invented a model of the atom that most closely resembles the modern electron cloud model.

What is an atom?

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

Learn more about atom,here:

brainly.com/question/13654549

#SPJ2
The scientist that invented a model that shows the electron cloud is Neil Bohr. 

How many grams of KNO3 would recrystallize from 100 g of water, if a saturated solution were cooled from 50 degrees celcius to 20 degrees celcius?

Answers

Answer:

m_(cryst)=58g

Explanation:

Hello there!

In this case, according to the attached solubility chart, it is possible for us to realize that about 88 grams of KNO3 are soluble at 50 °C but just 30 grams are soluble at 20 °C in the same 100 g of water.

In such a way, the crystalized mass of this solute can be calculated by subtracting the mass at 50 °C and the mass at 20 °C:

m_(cryst)=88g-30g\n\nm_(cryst)=58g

Best regards!

Gases tend to diffuse because

Answers

Gases tend to diffuse due to concentration gradient. Diffusion is generally cause by concentration gradient to achieve equilibrium. It moves from high concentration to low concentration. This is best describe Fick's Law.

What did Bohr’s model of the atom include that Rutherford’s model did not have?

Answers

What did Bohr’s model of the atom include that Rutherford’s model did not have?

The answer is energy levels
I think it's orbitals.
I'm pretty sure...

Mass of 2.88x10^-4 mol of ascorbic acid

Answers

Molar mass C₆H₈O₆ = 176.12 g/mol

1 mole ------------------ 176.12 g
2.88x10⁻⁴ mole -------  ?

mass = 2.88x10⁻⁴ * 176.12 / 1

mass ≈ 0.05072 g

hope this helps!
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