CHEMISTRY HIGH SCHOOL

In the ground state, has only 1 electron in a p orbital.A. carbon
B. fluorine
C. hydrogen
D. nitrogen
E. aluminum

Answers

Answer 1
Answer: Aluminium is the element you are looking for
Answer 2
Answer: (E) Aluminium is the answer

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What is the energy change that will occur when 25.5 grams of oxygen gas (O2) react with excess methane (CH4) according to the reaction below? CH4 + 2 O2yields CO2 + 2 H2O delta H = -889 kJ/mol

Select one:
a. 354 kJ of energy will be given off by the reaction
b. 354 kJ of energy will be absorbed by the reaction
c. 708 kJ of energy will be given off by the reaction
d. 708 kJ of energy will be absorbed by the reaction

Answers

amount of CH4 is excess, so no need to worry about it 
but the limiting factor is the Oxygen 

according to stranded equation, 

CH4 + 2 O2 --> CO2 + 2 H2O ΔH = -889 kJ/mol 


just by taking proportions 

(-889 kJ/mol) / 2 x 0.8 mol = - 355.6 kJ 

so i think the answer is (a)

The atoms of Group 7A elements _____ electrons when they form ions.A. share
B. gain
C. lose
D. cannot be determined

Answers

There are various kind of elements that are present in periodic table. Some elements are harmful, some are halogens, some are radioactive. Option B is correct option.

What is periodic table?

Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.

Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.

Group 7A elements includes halogens elements like Fluorine, Chlorine, Bromine and iodine, whose electronegativity is very high in whole periodic table. These element gain electron very easily.

Therefore, the correct option is option B.

Learn more about periodic table, here:

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The answer is B. gain. The elements from group 7a is F, Cl, Br, I... These elements has 7 electrons at the outer shell. And they are likely to gain one electron to stay at stable status.

What is the purpose of the ligaments?A Attach muscle to muscle

B Attach muscle to bone

C Attach bone to bone

DAttach bone to blood vessels

Answers

C: attach bone to bone

What is the main product of the calvin cycle?

Answers

glucose
Hope this helps

How does this data provide evidence for base pairing in dna

Answers

Answer:

There are chemical cross-links between the two strands in DNA, formed by pairs of bases. They always pair up in a particular way, called complementary base pairing: thymine pairs with adenine (T–A) guanine pairs with cytosine (G–C)

Explanation:

Hope it helps u

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How many moles of NO3 are there in 6.2g?

Answers

Answer : The number of moles of NO_3 is, 0.1 moles

Solution : Given,

Mass of NO_3 = 6.2 g

Molar mass of NO_3 = 62 g/mole

Now we have to calculate the moles of NO_3.

\text{Moles of }NO_3=\frac{\text{Mass of }NO_3}{\text{Molar mass of }NO_3}=(6.2g)/(62g/mole)=0.1moles

Therefore, the number of moles of NO_3 present in 6.2 g is, 0.1 moles
6.2 divided by the mass number of NO3 is 0.1 moles. Anytime your trying to find the moles of something you divide it by the mass number of your combined elements.
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