CHEMISTRY HIGH SCHOOL

Which type of attraction can be used to explain the high boiling point of H2O?1. ionic bonding
2. hydrogen bonding
3. polar covalent bonding
4. nonpolar covalent bonding

Answers

Answer 1
Answer:


The answer is Hydrogen bonding.

Hydrogen bonding among water molecules is responsible for the high specific heat of water the result of which water gains heat very slowly.

 Specific heat is the amount of  heat per unit mass that is required  to raise the temperature by one degree Celsius.

The specific heat of water is 4.186 joules/gram Celcius, which is higher than any other common substance. It is higher than that of a metal.

Thus due to this, water tends to boil at high temperature.

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How many moles of ethyl alcohol, C2H6O, are in a 18.0 g sample?

Answers

To find moles in this sample, you would divide grams by molar mass of ethyl alcohol
(18.0g)/(46.07g/mol) = 0.391mol C2H6O

What coefficients must be added to balance the following reaction __Sn+___H3PO4___=H2+___Sn3(PO4)4

Answers

answer 3Sn+ 4H3pO4= 6H2+Sn(PO)4

1 Sn                                  3 Sn
3 H                                    2 H
1 P                                    4 P
4 O                                    16 O
 then you have to make the numbers the same for each side

so you get by putting the 3 infront of Sn 4 infront of the H3PO4  and 6 infront of the H2
3 Sn                                   3 Sn
12 H                                    12 H
4 P                                      4 P
16 O                                     16 O

Choose the letter of the choice that best completes the statement or answers the question. Elements in the same group have the same __________. A. atomic radius
B. energy level of outer electrons
C. nuclear charge
D. number of valence electrons

Answers

I think the correct answer from the choices listed above is option D. Elements in the same group have the same number of valence electrons. They have the same number of electrons in the outer orbital. They are the electrons that are involved with chemical bonding with other elements.
Elements in the same group have D. Same number of valence electrons.

How do you decide whether an observed property of matter is a physical or a chemical property?

Answers

By the object's composition and the acting agent to which factors the change of the substance or entity.
The effect of physical property of matter on the object or substance can be better identified when the object doesn't change in composition or in nature. Unlike chemical property which has changed in its composition and atomic structure that was caused by chemical change or reaction due to an agent. Physical property is identified thru physical reactions or changes that has never changed the object in an atomic level, like cutting paper into smaller sizes. The aforementioned example illustrates physical proerty but being cut into smaller buts without changing the object from paper to any other substance, thus, its structure remain and its still called paper regardless of size, mass and texture. 
Because a physical property doesn't change the substance if you apply it. A chemical property will change its matter into a new substance.
Example of physical : cutting, because it will grow back to how it was
Example of chemical : flammability because if you burn it.....it wont go back to its original form.

Explain why phosphoric acid is needed for the battery to operate

Answers

Phosphoric acid can act like the acetic acid (vinegar) that can convert chemical energy into electrical energy.

Can someone help me with my chemistry homework?!

Answers

Answer:

calculate grams and use mole ratio lol

Explanation:

Answer:

Explanation:

23

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