CHEMISTRY HIGH SCHOOL

What is the symbol for iron?
a. I
b. F
c. Ir
d. Fe

Answers

Answer 1
Answer: The symbol for iron is Fe. Iron is an element with an atomic number of 26 and belongs to the group of metals in the first transition series. It is the most common and known element in the Earth's crust. It is very abundant in rocky planets which includes the Earth.

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Is the following sentence true or false? The lower the ionization energy, the easier it is to remove an electron from an atom. A. True B. False

Answers

Answer: It is True

Explanation:Because  Ionization energy refers to the amount of energy required to remove an electron from an atom.

These two compounds are in the liquid phase at 293 K a. Br₂ and Hg
b. Cl2 and F2
c. NH4^{+} and H₃O^{+}
d. Fe and Co
e. Diamond and graphite

Answers

It should be br and hg

Propane and oxygen react according to the equation: C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(g).How many grams of water can be produced from the complete combustion of 2.0 moles of C₃H₈(g)?
a. 144.0
b. 82.0
c. 8.0
d. 44.8
e. 22.4

Answers

1mole of propane produced 4 moles of water
44g of propane produced 18×4=72g of water
2moles of propane=2×44=88
44:72
88:x
44x=88×72
x=2×72
x=144.0grams option (a)

Given the following two thermochemical equations, H2(g) + ICI(8) HCl(g) + HI(g) AH° = -83.1 kJ = 12(8) + HCl(g) HI(g) + ICI(8) AH° = 73.6 kJ determine the standard enthalpy change associated with the following reaction: H2(g) + 21C1(g) 2HCl(g) + 12(9) AH° = ? -9.5 kJ -283.0 kJ O 156.7 kJ 0 -156.7 kJ O 9.5 kJ

Answers

Answer:

draw line DM perpendicular to ab

What is the mass of potassium chloride when 6.75g of potassium reactants with an excess of chlorine gas the balanced chemical equation

Answers

2K+Cl₂→2KCl
First you need to find the number of moles of potassium that is present in a 6.75g sample.  To do this you need to divide the mass of potassium (6.74g) by its molar mass (39.1g/mol) to get 0.172mol K.  Since we are told that the reaction happens with excess chlorine we know that potassium is the limiting reagent and we can therefore ignore chlorine gas and convert the moles of potassium straight to the moles of potassium chloride.  Since we know that 2 moles of potassium creates 2 moles of potassium chloride we can say that 0.172mol K turns into 0.172mol KCl since the molar ratio is 2/2 which can be thought of as 1.  The final step is to multiply 0.172mol KCl by its molar mass (74.55g/mol) to get 12.85g of potassium chloride.

I hope this helps.  Let me know in the comments if anything is unclear.

Which type of chemical reaction does this equation exemplify?

Answers

The chemical reaction that this equation exemplifies is Double Replacement. As in a double replacement reaction, the atoms of the compounds are switched and are displaced with other atoms of their respective elements to form new compounds.
combustion is the chemical reaction
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