1 year ago

A is an explanation of observations that have been tested many times.

1 answer:

6 0

Answer:

The correct answer is theory. Theory is an explanation of observations from the real world. A theory is developed after a hypothesis has been observed, tested and analyzed many times.

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Calculate the enthalpy change for the reaction of hydrogen and chlorine using the bond energies below.

babunello [35]

Answer:

final-intial temperature= enthalpy change

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3 years ago

Propane burns in oxygen to produce carbon dioxide and steam. The unbalanced equation for this reaction is: C3H8 + O2 → CO2 + H2O

NemiM [27]

Here is your answer

C3H8 + O2-----> CO2 + H2O

Balancing C atoms

C3H8 + O2------> 3CO2 + H2O

Balancing H atoms

C3H8 + O2------> 3CO2 + 4H2O

Balancing O atoms

C3H8 + $\bold{5}$ O2-------> $\bold{3}$ CO2 + $\bold{4}$ H2O

Hence the equation is balanced.

HOPE IT IS USEFUL

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2 years ago

Aluminum has a density of 2.70 g/mL. A sample of aluminum weighs 67.5 g. If this sample is put into a graduated cylinder that ha

romanna [79]

Answer:

60 ml

Explanation:

Now, we know that density = mass/volume

Mass of aluminium = 67.5 g

volume of aluminium =?

density of aluminium = 2.70 g/mL

volume of aluminium = mass/density = 67.5/2.70 = 25 ml

Since volume of water in the cylinder = 35 ml

The water rises to ; 35 ml + 25 ml = 60 ml

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2 years ago

What is a liquid mixture whose parts are evenly blended?.

Ilia_Sergeevich [38]

Homogeneous mixture

5 0

2 years ago

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What is the average mass of an electron? A. 1 amu B. 1,837 amu C. 1/1,837

diamong [38]

Answer:

C. 1/1,837

Explanation:

3 0

3 years ago