CHEMISTRY HIGH SCHOOL

The normal boiling point corresponds to the temperature at which both the liquid and gas are under the standard atmospheric pressure of 1 atm.TRUE

FALSE

Answers

Answer 1
Answer: TRUE. (Lorenzo Romano Amadeo Carlo Avogadro) Ideal Gas Law that defined as one in which all collisions between atoms or molecules are perfectly elastic in which there are no intermolecular attractive forces.  In such a gas, all the internal energy is the form of kinetic energy and any change in internal energy is accompanied by a change in temperature. That characterized by three state variables: absolute pressure (P) = 1 atm, volume (V) = 22.4 L and absolute temperature (T) = 273 K.

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Lambda=?c=299,792,458f=2x10to the 12th Hzlambda=c/fhow do I solve this?

Suppose you are asked to find the area of a rectangle that is 2.1-cm wide by 5.6-cm long. Your calculator answer would be 11.76 cm2 . Now suppose you are asked to enter the answer to two significant figures. (Note that if you do not round your answer to two significant figures, your answer will fall outside of the grading tolerance and be graded as incorrect.)

Answers

1) ALL non-zero numbers (1,2,3,4,5,6,7,8,9) are ALWAYS significant.2) ALL zeroes between non-zero numbers are ALWAYS significant.3) ALL zeroes which are SIMULTANEOUSLY to the right of the decimal point AND at the end of the number are ALWAYS significant.4) ALL zeroes which are to the left of a written decimal point and are in a number >= 10 are ALWAYS significant.

so it will be 11.76 = 12 bc 7 rounds up

Which notation represents an atom of sodium with an atomic number of 11 and a mass number of 24?

Answers

The atomic number of sodium is 11 and the mass number of sodium is 24. Mass number is equal to the number of proton and neutron present. Therefore, 12 protons and 12 neutrons are present in sodium.

What is mass number ?

The total number of protons and neutrons in an atomic nucleus is known as the mass number, often known as the atomic mass number or nucleon number. In atomic mass units, it is roughly equivalent to the atom's atomic mass.

Because it indicates the mass of the entire number of protons and neutrons in an element, the mass number of an element is so termed. The atomic number and atomic mass of an element are often listed in periodic tables, along with the chemical symbols for each element.

The concept of mass number was developed by the brilliant scientist Ernest Rutherford, who in 1911 used the gold foil experiment to break atoms and find the nucleus.

Thus, Na²⁴₁₁ 24 represent the mass number and 11 represent the atomic number.

To learn more about mass number, follow the link;

brainly.com/question/4408975

#SPJ2
Z, the lower number, is the atomic number. Therefore, Z=11.

A, the upper number, is the mass number. Therefore, A= 24.

Hope this helps~

Given chemical equations for these reactions s(s) + o2(g)  so2(g) ∆h˚ –296.8 kj•mol–1 h2(g) + ½ o2(g)  h2o(l) ∆h˚ –285.8 kj•mol–1 h2(g) + s(s)  h2s(g) ∆h˚ –20.6 kj•mol–1 what is the value of ∆h for the reaction below? 2 h2s(g) + 3 o2(g)  2 h2o(l) + 2 so2(g) (a) –603.2 kj•mol–1 (b) –562.0 kj•mol–1

Answers

Answer is: enthalpy is -1124 kJ/mol, if we divide reaction with two enthalpy is -562.0 kJ/mol.

Reaction 1: S(s) + O₂(g) → SO₂(g) ΔrH₁ = -296.8 kJ/mol.
Reaction 2: H₂(g) + ½ O₂(g) → H₂O(l) ΔrH₂ = -285.8 kJ/mol.
Reaction 3: H₂(g) + S(s) → H₂S(g) ∆rH₃ = -20.6 kJ/mol.
Reaction 4: 2H₂S(g) + 3O₂(g) → 2H₂O(l) + 2SO₂(g) ΔrH₄ = ?
Using Hess's law reaction number 4 is sum of reaction number 1 multiply with two, reaction number 2 multiply with two and reaction 3 reversed and multiply with two:
ΔrH₄ = 2 · (-296.8 kJ/mol) + 2 · (-285.8 kJ/mol) + 2 · 20.6 kJ/mol.
ΔrH₄ = -1124 kJ/mol.

An atom of the element zinc has an atomic number of 30 and a mass number of 65. How many protons does an uncharged zinc atom have?30
35
65
95

Answers

Answer : The correct option is, 30 protons

Explanation :

Element = Zinc

Atomic number = 30

Atomic mass number = 65

As we know that the atomic number is equal to the number of electrons and number of protons.

Atomic number = Number of electrons = Number of protons = 30

Number of neutrons = Atomic mass - Number of protons = 65 - 30 = 35

Therefore, the number of protons an uncharged zinc atom have 30 protons.

Answer:

30 protons

Explanation:

i took the test

On the pH scale, a solution with a pH of 7 would be classified as which of the following? A weak acid, weak base, neutral, or pure H2O?

Answers

It would be neutral.
It would be neutral ,but pure H2O is neutral in itself so it could be either of them 

How many molecules are in 10 moles of Hydrogen?

Answers

Answer:3.2

Mass:32

Molecular weight: 10

Moles: 3.2
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