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AnnZ [28]
3 years ago
5

Which phrase describes a hypothesis? a. reviewing information related to the problem b. testing a factor, or variable, in an exp

eriment c. suggesting a solution to a problem after studying it carefully d. performing a controlled experiment
Chemistry
1 answer:
monitta3 years ago
4 0

Answer:

c. suggesting a solution to a problem after studying it carefully

Explanation:

Hypothesis generally refers to an assumption made. This assumption can either be true or false. It is a reasoning presented in order to explain a phenomenon and is the starting point for further investigation.

Among the options, the closest that best describes it is option C.

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Which are properties of an electromagnetic wave? Check all that apply.
MA_775_DIABLO [31]

Answer: All are correct except for "carries energy only through matter

Explanation: E2020

7 0
4 years ago
How many joules of heat are absorbed to raise the temperature of 650 grams of water from 5.00c to it's boiling point, 100c
xenn [34]

Answer : The amount of heat absorbed are, 258485.5 J

Solution :

Formula used :

Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})

where,

Q = heat gained  = ?

m = mass of water = 650 g

c = specific heat of water = 4.186J/g^oC      

\Delta T=\text{Change in temperature} 

T_{final} = final temperature = 100^oC

T_{initial} = initial temperature = 5^oC

Now put all the given values in the above formula, we get the final temperature of copper.

Q=650g\times 4.186J/g^oC\times (100-5)^oC

Q=258485.5J

Therefore, the amount of heat absorbed are, 258485.5 J

7 0
3 years ago
Ans with solution...
Licemer1 [7]

Answer:

The answer to your question is:

Vol of NO2 = 11.19 L

Vol of O2 = 2.8 L

Explanation:

Data

N2O5 = 56 g

STP     T = 0°C = 273°K

           P = 1 atm

MW N2O5 = 216 g

Gases law = PV = nRT

Process

                   216 g of N2O5 ---------------- 1 mol

                     54 g               -----------------  x

                    x = (54 x 1) / 216

                    x = 0.25 mol of N2O5

                   2 mol of N2O5 -----------------  4 mol of NO2

                   0.25 mol          ------------------    x

                   x = (0.25 x 4) / 2 = 0.5 mol of NO2

                   V = nRT/P

                   V = (0.5)(0.082)(273) / 1 = 11.19 L

                   2 mol of N2O5 ----------------- 1 O2

                   0.25 N2O5 ----------------------  x

                   x = (0.25 x 1) / 2 = 0.125 mol

                   Vol = (0.125)((0.082)(273) / 1 = 2.8 L

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Explanation:

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