CHEMISTRY MIDDLE SCHOOL

The reaction 4Fe + 3O2 >> 2Fe2O3 is an example of what?
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Answers

Answer 1
Answer:

Answer:

Synthesis reaction

Explanation:

A synthesis reaction involves two or more reactants combining to form a single product.

4Fe + 3O2 —> 2Fe2O3

From the above reaction, the two reactants combine to form a single product. This is clearly a synthesis reaction.

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What is the molarity of a 50.0 mL solution that contains 0.0350 mol of sodium sulfate, Na2SO4?0.007 mol/L
0.07 mol/L
0.0007 mol/L
0.7 mol/l

Answers

Answer:

The molarity of a 50.0 mL solution that contains 0.0350 mol of sodium sulfate 0.7 (moles)/(liter)

Explanation:

Molarity is a concentration measure that indicates the amount of moles of solute that appear dissolved in each liter of the mixture.

So, the Molarity of a solution is determined by the expression:

Molarity (M)=(number of moles of solute)/(volume)

Molarity is expressed in units ((moles)/(liter)).

In this case:

  • number of moles= 0.0350
  • Volume=50 mL=0.05 L (1 L= 1,000 mL)

Replacing:

Molarity=(0.0350 moles)/(0.05 L)

Molarity= 0.7 (moles)/(liter)

The molarity of a 50.0 mL solution that contains 0.0350 mol of sodium sulfate 0.7 (moles)/(liter)

What must occur before clouds can form?

Answers

Condensation must occur.
condensation of water vapor also the water vapor must lose heat energy

Examples of energy being used around your class room

Answers

The statement, that describes the energy being used around your class room is "mechanical energy, heat energy, light energy and sound energy."

What is energy?

Energy is defined by scientists as the ability to perform tasks. Energy is described as the "capacity to accomplish work, which is the ability to apply a force that causes an object to move." It can be potential, kinetic, thermal, electrical, chemical, nuclear, or other. Computers, smart boards, overhead projection machines, lighting, and fans are used in the classroom.

Electrical energy is converted into mechanical energy by an electric fan.

The transfer of charge through the filament in the tubelight heats it up and causes it to glow. The tubelight transforms electrical energy to heat energy and light energy in this manner. When you switch on your computer, electrical energy is converted into sound and light energy. When the computer is turned on, electrical energy is converted to thermal energy.

Hence the correct answer is mechanical energy, heat energy, light energy and sound energy.

Learn more about energy here

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In the average classroom. You have AC and DC energy that flows through the wires and powers your computers, phones, projector (if you have one), the light-bulbs in the ceiling or around the room. Their is potential energy when an object is at rest for example your pencil or desk, There is Kinetic energy when objects are moving for example if you walk around or something is rolling around. You yourself is an example of energy.

Vinegar is a solution of acetic acid. What is the molarity of the solution produced when 125g of acetic acid (C2H4O2) is dissolved in sufficient water to prepare 1.50L of solution?

Answers

Answer: The molarity of solution is 1.39 M

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

Molarity=(n)/(V_s)

where,

n = moles of solute =\frac{\text {given mass}}{\text {molar mass}}=(125g)/(60g/mol)=2.08mol

V_s = volume of solution in L

Now put all the given values in the formula of molality, we get

Molarity=(2.08mol)/(1.50L)=1.39mol/L

Therefore, the molarity of solution is 1.39 M

What is the mass of 225 cm ^3 of ethanol? ethanol has a density of 0.789 g/cm^3

Answers

Answer:

177.53 grams

Explanation:

To find this, change the density equation from d=(m)/(v) to dv=m , doing this will allow you to multiply your given density (0.789 g/cm^3) by your given volume (225cm^3), giving your mass of 177.53 grams.

if you were going to try to get the noble gas argon to combine with another element, would fluorine be a good choice?

Answers

I guess I should say yes.
Due to its high activity, people use it to produce compounds of noble gas. Such as Xe, but for Argon and Fluorine, it requires very special conditions, super low temperature, and other conditions. 
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