CHEMISTRY HIGH SCHOOL

How many moles of lead (ii) chromate are in 51 grams of this substance? answer in units of mol?

Answers

Answer 1
Answer:

Mass of lead (II) chromate is 51 g. The molecular formula is PbCrO_(4) and its molar mass is 323.2 g/mol

Number of moles can be calculated using the following formula:

n=(m)/(M)

Here, m is mass and M is molar mass.

Putting the values,

n=((51 g)/(323.1937 g/mol)=0.1578 mol

Therefore, number of moles of lead (II) chromate will be 0.1578 mol.

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The reaction between NaOH(aq) and H2SO4(aq) was studied in a constant-pressure calorimeter: 100.0 mL portions of 1.00 M aqueous NaOH and H2SO4, each at 24.0C, were mixed. The volume of the mixture was 200.0 mL. The maximum temperature achieved was 30.6C. Neglect the heat capacity of the calorimeter and the thermometer, and assume that the solution of products has a density of 1.00 g/mL and a specific heat capacity of 4.18 J/(g·K). Calculate H, the heat (enthalpy) of reaction, in kJ per mole of acid. (Hint: You may not have the equivalent amounts of NaOH and H2SO4 in this experiment.)

Knowing the chemical properties of a substance will tell you how the substancea. looks.
c. can be broken down into atoms.
b. smells.
d. reacts with other substances.

Answers

Whereas physical properties of a substance tells us about how the substance looks, smells, etc, the chemical properties of a substance basically tells us how the substance will react with other substances. Therefore, knowing the chemical property of a substance tells us how the substance reacts with others.Hope this helps. Let me know if you need additional help!
d. reacts with other substances.

How many aluminium atoms are there in the formula for aluminium nitrate ?

Answers

The formula for Aluminium Nitrate is Al(NO _(3) )_(3).

This is because aluminium has a 3+ charge and nitrate has a 1- charge, so you need 3 of them to balance out aluminium.

Therefore, you have one ion of aluminium.

If an atom has 6 protons and 5 neutrons, what is its mass? _________ amu

Answers

Answer:An atom has 5 protons, 5 electrons and 6 neutrons The atomic number = number of protons = number of electrons = 5 The mass number = 5 protons + 6 neutrons = 11

4. What parts of Dalton’s atomic theory no longer agree with the current picture of the atom? Provide an answer using 3 – 4 sentences in your own words.

Answers

Since you did not show anypicture, I will be describing Dalton’s atomic theory. The scientist thoughtthat the atom was the smallest particle in the universe is John Dalton. Heestablished five theories relating atoms. One, elements are made of extremelysmall particles called atoms. Two, atoms of different element have differentsizes, mass and physico – chemical properties. Three, atoms cannot be dividedfurther, destroyed or created. It also follows the law of conservation ofenergy. Fourth, atoms can combine to form compounds. And lastly, in chemicalreaction, atoms can be combined, separated or rearranged. 

dalton said that the atom is the smallest particle but now we know that an atom can be divided into electron proton and neutron.

the guy below should be deleted but you cant cause its approved, he didnt even asnwer the question XD

At what temperature will the following reaction happen spontaneously, given that ΔH=8.91×103J and ΔS= –219.20 J/K? CaSO4(s) + 2HCl(g) → CaCl2(s) + H2SO4(l)A) at 298 K
B) at 100 K
C) It is spontaneous at any temperature.
D) It is not spontaneous at any temperature.

Answers

Answer:

D) It is not spontaneous at any temperature.

Explanation:

Given reaction:

CaSO4(s) + 2HCl(g) → CaCl2(s) + H2SO4(l)

ΔH = +8.91*10³ J

ΔS = -219.20 J/K

The sign of the Gibbs free energy (ΔG) determines the spontaneity of a given reaction. ΔG is related to ΔH and ΔS as follows:

\Delta G = \Delta H-T\Delta S

A reaction is spontaneous only when ΔG is negative i.e. ΔG < 0

Under the given conditions:

ΔH > 0 ; ΔS <0 and ΔH > ΔS

i.e. ΔG = ('+' value) - T( '- 'value) = + value

Therefore, irrespective of the temperature, ΔG will always be positive
DG = DH - TDS 

For this reaction DH>0 and DS<0. So, d. the reaction is not spontaneous at any temperature.

One group of scientists has proposed a new theory on Adaptation. A majority of scientists worldwide agree with the theory. The theory is most likelyA.biased.
B.incomplete.
C.accurate.
D.unchangeable.

Answers

The theory is most likely accurate and the main reason behind this process of thinking is because a majority of the scientists around the world agree with the theory. It can never be biased or incomplete. The correct option among all the options that are given in the question is the third option or option "C".

Answer: The correct answer is-

C.accurate.

As per the information in the question, a group of scientists has proposed a new theory on Adaptation, which is accepted by majority of scientists worldwide. This indicates that the proposed theory is most likely to be accurate.

A scientific theory is an explanation of certain aspects of nature that is based on some facts as well as evidences. It is tested, observed, and proven right on the basis of repeated experimentation.

As the theory on Adaptation is accepted by majority of the scientists, it means that it is most likely to be accurate.

Thus, option C) is the right answer.
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