In which chemical reaction will the heat content of the reactants be more than that of the products?

Answers

Answer 1

Answer: When the heat content of the reactants be more than that of the products, this reaction is most likely is an endothermic reaction. This type of reaction is characterized by the absorbing heat into the system or the addition of energy into the system for the reaction to occur.

Answer 2

Answer: Exothermic. On Plato it will be answer D.

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Henri Becquerel discovered radium and polonium.Please select the best answer from the choices providedTF
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Find the grams of iron in 79.2 g of Fe2O3.

Answers

First you find the RFM (Relative Formula Mass) of Fe2O3
Fe2 = 56 x 2
= 112
O3 = 16 x 3
= 48

112 + 48 = 160

Moles = mass/RFM
   = 79.2/160
   =0.495

Then you rearrange the formula
Mass= moles x RFM
      = 0.495 x 112
      = 55.44 g
(To find mass of Iron have to use RFM of total iron in the substance example Fe2 ^^)

Based on the results of testing colorless solutions with indicators, which solution is most acidic?(1) a solution in which bromthymol blue is blue
(2) a solution in which bromcresol green is blue
(3) a solution in which phenolphthalein is pink
(4) a solution in which methyl orange is red

Answers

On litmus paper (the slip of paper that changes color to measure acidity), the redder the color is, the more acidic it is.
Therefore, the solution that is most acidic is methyl orange because it was a darker red then any of the others.

Answer: Methyl Orange (#4)

Hope this helped!! :D

Bromothymol blue is blue in a basic solution (yellow in acid).Bromocresol green is blue in a basic solution (yellow in acid).
Phenolphthalein is pink in a basic solution (colorless in acid).Methyl orange is red in an acidic solution. Therefore, the most acidic solution is #4.

Each level of energy transfer in an ecosystem or food chain is called a(n) trophic level

energy level

consumer level

food level

Answers

The correct answer is the first option. Each level of energy transfer in an ecosystem or food chain is called a trophic level. It comprises organisms that share the same function in the food chain in relation to the primary sources of energy.

The correct option is the first one

Provide a balanced equation for the reaction between lead nitrate and sodium chloride

Answers

Answer:

Pb(NO3)2 + 2NaCl = PbCl2 + 2NaNO3

Explanation:

Lead nitrate is Pb(NO3)2

Sodium Chloride is NaCl

The basic reaction is:

Pb(NO3)2 + NaCl = PbCl2 + NaNO3

Now we need to balance the equation. Note that the lead nitrate contributes 2 (NO3) units, but there is only 1 NO3 on the product side. So start by adding a second NaNO3:

Pb(NO3)2 + NaCl = PbCl2 + 2NaNO3

Now we have 2 Na atoms on the right side, so add a "2" to the NaCl:

Pb(NO3)2 + 2NaCl = PbCl2 + 2NaNO3

This is starting to look good. Lets check the atom/unit counts on both sides of the equation:

Reactants Products

Pb 1 1

NO3 2 2

Na 2 2

Cl 2 2

The equation is now balanced. Pb(NO3)2 + 2NaCl = PbCl2 + 2NaNO3

Predict the changes in the number of particles based the diagram.A) Pressure is indirectly related to moles.
B) Volume is proportionally related to moles.
C) Moles remains constant as pressure changes.
D) Temperature is directly related to the moles.

Answers

Pressure is indirectly related to volume.

As the volume increases at a constant temperature, the pressure decreases.

The changes in the number of particles based on the diagram is that Volume is proportionally related to moles. The answer is letter B. The rest of the choices do not answer the question above.

Which one of the following is smallest in size?

N3- O2- F- Na

Answers

F- is the smallest because it accepts 1 electron 2 make its atomic number 10 making it have jst 2 orbitals but O²-,N³- and Na have their atomic number to be 18,17 and 11 respectively with 3 orbitals..
hope this helps *winks*

F- is the smallest. Na is largest, so that would not be correct 100%

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