CHEMISTRY HIGH SCHOOL

The table below gives information about the nucleus of each 4 atoms Atom Number of protons Number of neutrons

A 6 6

D 6 7

G 7 7

E 7 8

How many different elements are represented by the nuclei in the table?

A 1

B 2

C 3

D 4

Answers

Answer 1
Answer:

Atom Number of protons Number of neutrons. 2 elements are represented by the nuclei in the table

What is the difference between atomic number and atomic mass ?

Atomic number of an element  is defined as total number of protons present in the nucleus, neutrons carry no net electrical charge, so it is the charge number of the nucleus.

atomic mass of an element can be defined as the atomic weight is measured total mass of an element’s atom, the total number of neutrons and protons in the nucleus of an atom.

Both Atomic mass and an atomic number of elements are closely related if  atomic number is high, then the atomic mass is also said to be high.

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Answer 2
Answer:

Answer:

B.

Explanation:

BECAUSE IT IS B.

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the titration of 80.0 ml of an unknown concentration phophorice acid solution requires 252 ml of 0.218 m potassium hydroxide solution. what is the concentration of the phosphoric acid solution (in mi?

Answers

The concentration of the phosphoric acid solution required for the titration of 252 ml of 0.218 M potassium hydroxide solution is 0.2289 M.

To determine the concentration of the phosphoric acid solution, we can use the titration equation:

mole of acid = moles of base

Phosphoric acid (H3PO₄) reacts with potassium hydroxide (KOH) in a 1:3 ratio:

H₃PO₄ + 3KOH → 3H2O + K₃PO₄

Now, we can calculate the moles of KOH using its volume and concentration:

moles_KOH = volume_KOH × concentration_KOH
moles_KOH = 0.252 L × 0.218 M
moles_KOH = 0.054936 mol

Since H3PO4 reacts with 3 moles of KOH:

moles of H₃PO₄ = moles KOH / 3
moles of H₃PO₄ = 0.054936 mol / 3
moles of H₃PO₄ = 0.018312 mol

Now, we can determine the concentration of H3PO₄:

concentration of H₃PO₄ = moles_H3PO4 / volume_H₃PO₄
concentration of H₃PO₄ = 0.018312 mol / 0.080 L
concentration of H₃PO₄ = 0.2289 M

So, the concentration of the phosphoric acid solution is approximately 0.2289 M.

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Which is an example of pseudoscience? A. use of X-rays to observe the bones of the arm B. use of DNA analysis to determine paternity C. use of vaccines to prevent the occurrence of disease D. use of astrology to predict the personality of a child

Answers

Answer is D. use of astrology to predict the personality of a child

Astrology is not a science, astronomy is a science.
Astrology is more related to myths, legend and human interpretation of the sky, universe, planets.
Which is an example of pseudoscience? 
Answer:
D. use of astrology to predict the personality of a child 

what volume of .123 m naoh, in milliliters, contains 25.0 g of naoh? (density of the solution is 1.05 g / ml)

Answers

Answer:

8.46 liters of 0.123 NaOH contains 25.0 grams of NaOH.

Explanation:

Molar is defined as Moles/Liter.  0.123 M means there is 0.123 moles of NaOH per 1 liter.  We are asked to determine how many milliliters of this concentration NaOH it would take to deliver 25.0 grams of NaOH.

Use the units to guide the calculation.

Remember that:    Concentration x Volume = Moles

 (0.123 moles/liter)*(V) = moles

 We want 25.0 grams of NaOH.  Let's convert that to moles using the molar mass of NaOH:

(25.0 grams NaOH)/(24.0 g/mole) = 1.04 moles NaOH.

Now we can write:

 (0.123 moles/liter)*(V) = 1.04 moles NaOH

V = (1.04/0.123) Liters

V = 8.46 liters

How did Diocletian try to improve Rome’s economy

Answers

He divided the empire into provinces. 

What group of elements least strongly attract electrons from other atoms in a compound

Answers

well there are two possibilities. The noble gases technically have the lowest electronegativitey, but often they are referred to as being non reactive and stable. In which case for elements that are reactive group 1 has the lowest electronegativitey and tends to lose its electron.

A hydrocarbon is said to be saturated if: A)           one end of the molecule is hydrophilic while the other end is hydrophobic.
                B)            it has one or more double bonds between carbon atoms.
                C)            it contains more than one functional group.
                D)           each internal carbon atom is covalently bonded to two hydrogen atoms.
                E)            its functional groups include at least one aromatic ring.

Answers

D. If each eternal carbon is bonded to 2 hydrogen atoms, the hydrogen carbon is saturated. An easier way to remember if a hydrocarbon is saturated or not is to look for a double bond between 2 carbons in the chain, if this if present the hydrocarbon is UNsaturated, if this is not present the hydrocarbon is saturated.
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