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schepotkina [342]
3 years ago
14

Can anyone explain this to me?

Chemistry
1 answer:
Kipish [7]3 years ago
5 0
The answer is D, the definition of standard enthalpy of formation is as follows: when one mole of a substance in the standard state (1 atm of pressure and 298.15 K) is formed from its pure elements. The last two words being especially important to this question. We would rule out A, B and C all because the product is formed from a mixture of an element and a compound and not just of elements. In other questions the reactants may all be in elemental form so you must look at the products being one mole or the reactants not being in their standard state.
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Which effect are most likely from a hurricane? Check all that apply
const2013 [10]

The correct answers are option - A , B, D and E

Damaged homes due to flooding  

Uprooted trees due to high winds

Eroded coastline due to storm surge  

Damaged personal property due to hail

Reason -

A hurricane when strikes a coastal area causes serious hazards such as heavy rains, high winds, a storm surge, and even tornadoes. A storm surge pushes the sea water on the shore and thus causes flooding near the coast. However heavy rains cause flooding in inland areas. High winds, storm surge, flooding and tornadoes causes damaging of house, personal property and car.

5 0
4 years ago
I NEED HELP ASAP!!!!!!!!!!!!!!!!!!!
Hoochie [10]

Answer:

a) 0

Explanation:

Each of the small dots surrounding the C1 represents one electron. These are where electrivity comes from. Since there is the same number of electrons in both atoms, the difference is 0 (because 6 electrons-6electrons= 0).

4 0
2 years ago
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10. Which of these measurements have four significant figures? *
anastassius [24]

Answer:

3.050 g

Explanation:

6 0
4 years ago
The particles of a solid _____ in place.
chubhunter [2.5K]
Holds the particles tightly
7 0
3 years ago
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Which pair of atoms forms a nonpolar covalent bond? which pair of atoms forms a nonpolar covalent bond? na and cl c and o n and
adelina 88 [10]

Types of Bonds can be predicted by calculating the difference in electronegativity.

If, Electronegativity difference is,

 

                Less than 0.4 then it is Non Polar Covalent

                

                Between 0.4 and 1.7 then it is Polar Covalent 

            

                Greater than 1.7 then it is Ionic

 

For Na and Cl,

                    E.N of Chlorine       =   3.16

                    E.N of Sodium        =   0.93

                                                   ________

                    E.N Difference             2.23          (Ionic Bond)


For C and O,

                    E.N of Oxygen       =   3.44

                    E.N of Carbon        =   2.55

                                                   ________

                    E.N Difference             0.89          (Polar Covalent Bond)


For N and Cl,

                    E.N of Chlorine      =   3.16

                    E.N of Notrogen     =   3.04

                                                   ________

                    E.N Difference             0.12           (Non-Polar Covalent Bond)


For B and O,

                    E.N of Oxygen        =   3.44

                    E.N of Boron           =   2.04

                                                   ________

                    E.N Difference             1.40          (Polar Covalent Bond)

8 0
4 years ago
Read 2 more answers
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