We can also use the activity series to predict reactions between a metal and an acid. what are the products of the reaction fe(s) + h2so4(aq)?
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Answer;
FeSO4 (aq) + H2 (g)
Explanation;
The reaction between iron and dilute sulfuric acid gives a salt and hydrogen gas. (iron (ii) sulfate and hydrogen gas).
The equation for the reaction is;
Fe(s) + H2SO4 (aq) = FeSO4(aq) +H2(g)
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b. nuclear energy.
c. sharing nuclei.
d. attractive forces.
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hope this helps
Answer:
a. Chemical bonds.
Explanation:
Hello,
In this case, it is necessary to know that when two elements are not stable by their own they should bond with an other atom of the same element via chemical bonds whereby the valence electrons act as bridges connecting the atoms. Some examples are diatomic-gaseous hydrogen, oxygen, nitrogen, chlorine, iodine, fluorine and bromine. Moreover, such chemical bonding is represented by lines binding the elements as shown on the attached picture.
Best regards.
Answers
Answers
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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b. when atoms share electrons.
c. between metals and nonmetals.
d. when electrons are transferred from one atom to another.
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B. In a chemical change, a substance changes its phase
C. In a chemical change, the molecular structure of a substance changes
D. In a chemical change, one substance dissolves into another
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Answer : The correct option is C.
Explanation :
Chemical change : It is defined as a change in which a new compounds are formed by the chemical reaction. Changes occurs in their chemical composition and properties.
The molecular structure of a substance changes in a chemical reaction is a chemical change.
- Change in molecular structure means that there is a breaking and formation of bonds in a molecule.
The example of chemical change in terms of change in molecular structure is the reaction of hydrogen with oxygen.
The reaction of hydrogen with oxygen is,
In this reaction, the H-H bond is break and O-H bond is form.
B) what mass of iron(lll) oxide, Fe2O3, must be consumed to prepare 2.50g of iron metal
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One mole of dihydrogen is required to form one mole of iron, hence you'll need
B) Likewise : 2.50g of Iron is