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zaharov [31]
2 years ago
11

BRAINLIEST! Please help me answer the following questions:

Chemistry
1 answer:
Vlada [557]2 years ago
6 0

Explanation:

1) from the periodic table for example if u looking for K it is from the group 1A so the valancey = +1 that is mean it loses one electron to reach a stable state. and this applied for the 1A , 2A, 3A groups.

if u looking for N it is from group 5A so its valency is -3

so it gain 3 electrons to reach a stable state to complete its orbital to 8 electrons. this applied to 5A, 6A,7A

for the transition metals and simimetals other rules.

2) neutral if the element does not hold any charge like

H2, O2, N2, Fe, Au, Cu ...

isotope : if the 2 elements have same symbol and atomic number but they differ in the mass number because the have different numbers of neutrons.

if the element is charged then it is considered as an ion ex: Fe2+ then it is iron cation ( +ion)

F- then it is fluoride anion (-ion)

if u have any doubt just writ a comment ( ;

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prohojiy [21]
The periods inside the Periodic Table is B. a horizontal row, and is numbered 1 through 7


hope this helps
7 0
3 years ago
Which of the following is the best example of potential energy?
strojnjashka [21]
Answer :

A car stopped at the top of a hill

Explanation :

Definition of potential energy : energy stored that depends upon the relative position of various parts of a system
5 0
2 years ago
Hannah wants to make some toast for breakfast, but she has 3 minutes before she has to leave for school.
marusya05 [52]

Answer: increase the temperature of the toaster oven.

Explanation:

3 0
3 years ago
Calculate how many moles of NH3 form when each quantity of reactant completely reacts according to the equation:
Leya [2.2K]
<span>1) Use the balanced chemical equation to find the molar ratios (proportions) of each product and reactant.

3N2H4(l)→4NH3(g)+N2(g)

=> molar ratios: 3 mol N2H4 : 4 mol NH3

2) Use the product to reactant molar ratio, and the quantity of reactant to determine the yield:

2.0 mol N2H4 * [4mol NH3] / [3mol N2H4] = 2*4/3 mol NH3 = 2.7 mol NH3

Answer: 2.7 mol
 
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8 0
3 years ago
A gas was held at a constant temperature in a closed system. The initial
zaharov [31]

Answer:

1.84 atm

Explanation:

P2=V1P1/V2

Temp is irrelevant because it is constant, so all you have to do is rearrange the ideal gas law.

You can check this by knowing P and V at constant T have an inverse relationship and therefore makes this the correct answer.

- Hope that helps! Please let me know if you need further explanation.

7 0
3 years ago
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