CHEMISTRY HIGH SCHOOL

You add 4.7 gg iron to 27.10 mL of water and observe that the volume of iron and water together is 27.70 mLmL . Calculate the density of iron.

Answers

Answer 1

Answer:

Answer : The density of iron is, 7.8 g/mL

Explanation : Given,

Mass of iron = 4.7 g

Volume of water = 27.10 mL

Volume of water and iron = 27.70 mL

First we have to calculate the volume of iron.

Volume of iron = Volume of water and iron - Volume of water

Volume of iron = 27.70 mL - 27.10 mL

Volume of iron = 0.6 mL

Now we have to calculate the density of iron.

$\text{Density of iron}=\frac{\text{Mass of iron}}{\text{Volume of iron}}$

Now put all the given values in this expression, we get:

$\text{Density of iron}=(4.7g)/(0.6mL)$

$\text{Density of iron}=7.8g/mL$

Thus, the density of iron is, 7.8 g/mL

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Which fuel is used for nuclear power?a. coal
b. oil
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d. uranium

Answers

Hello,

The fuel used for nuclear power is Uranium.

So uranium is used for nuclear power.

Thanks for using brainly.

Correct option is D. Uranium because atoms of uranium helps to replaces the burning of coal or gas.

Hope this helps you.. :)

How much heat is required to vaporize 50.0 g of water if the initial temperature of the water is 25.0◦c and the water is heated to its boiling point where it is converted to steam? the specific heat capacity of water is 4.18 j · ( ◦c)−1 · g −1 and the standard enthalpy of vaporization of water at its boiling point is 40.7 kj · mol−1?

Answers

Q = mCΔT
Q is heat, m is mass, C is specific heat, and ΔT is change in temp

First, find how much energy you need to raise the heat to 100C, or the boiling point
Q = (50g)(4.18)(75 degrees) = 15675 J or 15.675 kJ

Then you need 40.7 kJ extra for each mole of water to evaporate it
If you have 50 grams of water and there are 18 grams per mol
50g / 18g = 2.8 moles x 40.7 = 113 kJ extra

15.675 + 113 kJ = 128.7 kJ required

Final answer:

The total heat required to heat 50 g of water from 25 °C to boiling and then vaporize it is approximately 128.821 kJ.

Explanation:

To calculate the total heat required to boil the water, we need to consider two steps: heating the water from its initial temperature to the boiling point, and then converting the water at its boiling point to steam.

Firstly, we calculate the heat needed to heat the water to the boiling point, using equation q = mcΔT: q1 = m * c * ΔT = 50.0 g * 4.18 J/(g • °C) * (100°C - 25°C) = 15675 J = 15.675 kJ
Next, amount of heat needed to vaporize the water at its boiling point can be found using the standard enthalpy of vaporization, ΔHvap = 40.7kJ/mol. But this value is per mole, so we need to convert grams of water to moles using the molar mass of water (18 g/mol). So, the number of moles of water is 50 g / 18 g/mol = 2.78 mol. The heat for vaporization, q2 = n * ΔHvap = 2.78 mol * 40.7 kJ/mol = 113.146 kJ.

Therefore, the total heat required to heat and vaporize the water is q = q1 + q2 = 15.675 kJ + 113.146 kJ = 128.821 kJ.

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The process that ice on mount Everest goes through when heated from 10 degree f to 305 kelvin.

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water melts at 32 F and boils at 212 F
if we change these values into Kelvin then
melting point of water is 273.15 K and boiling point is 373.15 kelvin..
for melting it is necessary for ice to get warm so it attains heat 10 F to 32 F...
then ice melts but during this temperature remains constant..
the energy required for melting is 333 kJ/Kg K
then water is warmed at 305 Kelvin.... :)

Chemical A and Chemical B react in an exothermic reaction. What can be known about what will happen when Chemical A and Chemical B are mixed together?The new substance will need more energy to form its chemical bonds than the old substance will release.
More energy will be released from the old substance than the new substance will need to form its chemical bonds.
The color will change as a result of the reaction.
The substance will bubble as a result of the reaction.

Answers

More energy will be released from the old substance than the new substance will need to form its chemical bonds.

Answer:

Explanation:

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Help please! :)Why are prefixes not needed in naming ionic compounds?
A. lon charges are written as superscripts with the names of the
atoms.
B. Roman numerals are used instead of prefixes to indicate number.
C. Subscripts are used in the name to indicate number of atoms.
D. Ions combine in only one ratio.

Answers

Prefixes are not used to indicate the number of atoms when writing the chemical formula. The number of atoms are written as subscripts to their chemical symbols.

What is chemical formula?

Chemical formula of a compound is used to identify a compound and distinguishes it from other compounds. A chemical formula is written from the chemical symbols of elements which constitute the compound.

The number of atoms of each element is written as the subscripts of the symbols for each atoms. For example,magnesium chloride contains one magnesium and two chlorine atoms thus, its formula is MgCl₂.

The subscripts for each atom in the formula of an ionic compound is the charge of the other atom into which it is bonded. Similarly, the formula of iron oxide containing 2 Fe and 3 O is written as Fe₂O₃.

To find more on chemical formula, refer here:

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Answer:

Ions combine into only one ratio

Explanation:

Just took test

When a cold drink is taken from a refrigerator, its temperature is 5°C. After 25 minutes in a 20°C room its temperature has increased to 10°C. (Round your answers to two decimal places.) (a) What is the temperature of the drink after 40 minutes? 12.51 Incorrect: Your answer is incorrect. °C (b) When will its temperature be 12°C?