CHEMISTRY HIGH SCHOOL

Which professional is most likely to suffer damage from lead contamination?A. doctor
B. farmer
C. painter
D. carpenter

Answers

Answer 1
Answer: its c because lead comes from paint The use of lead-based paints for homes, children's toys and household furniture has been banned in the United States since 1978. But lead-based paint is still on walls and woodwork in many older homes and apartments. Most lead poisoning in children results from eating lead-based paint chips. hope this helps
Answer 2
Answer: Farmer because a farmer needs the soil to grow his crops and if a power plant leaks he will have no more crops

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As water is added to a 0.10 M NaCl aqueous solution, the conductivity of the resulting solution

Answers

There are two types of conductance

a) molar conductance

b) specific conductance

specific conductance is also known as conductivity

Molar conductance [the conductance offered by one mole of electrolyte dissolved in any volume of solution] increases with increase in dilution. The reason for weak and strong electrolytes are different.

i) for weak electrolytes the molar conductance increases due to increase in degree of dissociation

ii) for strong electrolytes the molar conductance increases due to decrease in inter ionic interactions

Conductivity (specific conductance) is the conductance offered by one unit volume of an electrolytic solution

The conductivity decreases with increase in dilution due to less number of ions per unit volume of solution.

so here the conductivity of resulting solution will decrease if water is added to a 0.10 M NaCl  solution
The more water added the lower the conductivity. The Na+ and Cl- ions allow the solution to be conductive. The lower the concentration, the less conductive the solution will get until it is not conductive at all. 

In which compound is the percent by mass of oxygen greatest?A. BeO
B. MgO
C. CaO
D. SrO

Answers

Answer: BeO

Explanation:

percent by mass of oxygen=\frac{\text {mass of oxygen}}{\text {Total mass of substance}}* 100\%

percent by mass of oxygen in BeO=(16g)/(25.01g/mol)* 100=63.97\%

percent by mass of oxygen in MgO=(16g)/(40.30g/mol)* 100=39.70\%

percent by mass of oxygen in CaO=(16g)/(56.08g/mol)* 100=28.53\%

percent by mass of oxygen in SrO=(16g)/(103.62g/mol)* 100=15.44\%
The answer is A
Hide the Oxygen for a minute
Mass of elements:
Be:9.012
Mg:24.305
Ca:40.078
Sr:87.62
Out of all these choices, Be is the lightest

Which of the following atoms has the same number of neutrons as 19F?a. 16O
b. 18F
c. 20Ne
d. 23Na

Answers

C. 20Ne

19F has 19-9=10 neutrons

Ne=20-10=10 neutrons

An example of a physical property of an element is the element’s ability to(1) react with an acid(2) react with oxygen(3) form a compound with chlorine(4) form an aqueous solution

Answers

Answer is: 4) form an aqueous solution.

Physical property can be observed and measured without any changes in molecular composition. The same substance is present before and after the change.  Making aqueous solution is physical change (solvatation).

Element reactions with acids, oxygen and chlorine are chemical change (chemical reaction combustion), because new substances are formed, the atoms are rearranged and the reaction is followed by an energy change (exothermic reaction because energy is released).
4: Form An Aqueous Solution 

This is the only answer that can be observed without testing gear and with the naked eye.... Hope I helped ^-^

How many moles of O2 would be consumed if 13.673 g of V were consumed according to the reaction below?

Answers

To determine how many moles of O2 would be consumed if 13.673 grams of V (vanadium) were consumed in a chemical reaction, you'll first need to know the balanced chemical equation for the reaction. I'll assume the reaction is as follows:

V + O2 → VO2

From the balanced equation, you can see that 1 mole of V reacts with 1 mole of O2 to form 1 mole of VO2. This means that the mole ratio of V to O2 is 1:1.

Now, calculate the number of moles of V in 13.673 grams:

Moles of V = Mass (grams) / Molar mass (g/mol)

The molar mass of V is the atomic mass of vanadium, which is approximately 50.94 g/mol.

Moles of V = 13.673 g / 50.94 g/mol ≈ 0.2684 moles

Since the mole ratio of V to O2 is 1:1, the number of moles of O2 consumed will also be approximately 0.2684 moles.

So, 0.2684 moles of O2 would be consumed if 13.673 grams of V were consumed in the reaction.

Differentiate between atoms, elements, molecules and compounds

*URGENT

Answers

Atoms are the simpliest form of matter. But an atom can be classified as an element and an element can be presented various substance. An element can be oxygen, hydrogen and so on. The combination of two or more elements is a compound. A compound can be a molecule, same as the atom to element.  
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