What are the three elements found in a molecule of calcium carbonate? Give their atomic numbers and chemical symbols. How many atoms of each are found in one molecule of calcium carbonate?

Answers

Answer 1

Answer: Calcium carbonate is CaCO3.
So there is calcium, symbol is Ca and an atomic number of 20.
Carbon: symbol is C and an atomic number of 6.
Oxygen: symbol is O and an atomic number of 8.
In one molecule of CaCO3, there is one atom of Ca, one atom of C, and three atoms of O as shown by the subscript next to O in the formula. There are no other subscripts to indicate more than one atom of the other elements, so there is only one atom of the other two elements

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The standard enthalpy change for the reaction of SO3(g) with H2O(l) to yield H2SO4(aq) is ΔH∘ = -227.8 kJ . Use the following information S(s)+O2(g)→SO2(g), ΔH∘ = -296.8kJ SO2(g)+12O2(g)→SO3(g) , ΔH∘ = -98.9kJ to calculate ΔH∘f for H2SO4(aq) (in kilojoules per mole). [For H2O(l),ΔH∘f = -285.8kJ/mol].

Two very stable compounds, Freon-12 and Freon-14, are used as liquid refrigerants. A Freon-12 molecule consists of one carbon atom, two chlorine atoms, and two fluorine atoms. A Freon-14 molecule consists of one carbon atom and four fluorine atoms.81 In the space in your answer booklet, draw a structural formula for Freon-12. [1]

82 To which class of organic compounds do Freon-12 and Freon-14 belong? [1]

Answers

81. There is 1 carbon, 2 chlorine and fluorine atoms in Freon 12. To draw them it forms a cross with C in the middle and Cl and F both on the opposite side.
Cl
l
F - C- F
l
Cl

82. Freon-12 and Freon-14 are called halocarbons or just halides.

Answer:

- The structural formula for Freon-12 (CCl2F2)

Cl - C - Cl

It has the same structure as methane (CH4) with Hydrogen atoms replaced by Chlorine and Fluorine

- Freon-12 and Freon-14 belong halocarbons, a compound in which the Hydrogen of a hydrocarbon is replaced by halogens, like Chlorine and Fluorine.

All of the following statements about electrons are true except?

Answers

A . Electrons are found in the nucleus of an atom

According to your information, it would be your answer,

Hope this helps!

Na2S2O3 + KBrO3 + H2SO4 = Na2S4O6 + K2SO4 + Na2SO4 + Br2 + H2O

Answers

It helps writing it down on a piece of paper, and doing these problems with a pencil and good eraser. I like to make a grid at the bottom of my paper listing all the elements on the left side and the right side to see which part of the equation I need to balance.

22 Na2S2O3 + 10 KBrO3 + 7 H2SO4 = 8 Na2S4O6 + 5 K2SO4 + 14 Na2HSO4 + 5 Br2

Which of the following has a positive enthalpy without a temperature change? condensing gas

evaporating a liquid

cooling a solid

cooling a liquid

Answers

A cooling solid because a cooling liquid would turn into a solid

i think the answer is cooling a liquid

How many grams of NaOH were dissolved to make a 1.25 L solution of 2.92 M NaOH?

Answers

Answer:

146. g

Explanation:

1) Data:

a) mass of solute = ?

b) volume of solution = 1.25 liter

c) M = 2.92 mol/liter

d) solute NaOH

2) Formulae:

a) Molarity, M = number of moles of solute / volume of solution in liters

b) mass in grams = molar mass × number of moles

3) Solution:

a) Calculate number of moles of solute:

M = number of moles of solute / volume of solution in liters

⇒ number of moles of solute = M × volume of solution in liters

⇒ number of moles of solute = 2.92 mol/liter × 1.25 liter = 3.65 mol

b) Molar mass of NaOH = 39.997 g/mol (you can take this number from internet or calculate it using the atomic masses of Na, O, and H).

c) Calculate the mass of solute:

mass in grams = molar mass × number of moles = 39.997 g/mol × 3.65 mol = 145.98905 g = 146. g

The answer must be reported with 3 significant figures, so it is 146. g.

What is the best description of the Bohr model of the atom?A.)The atom consists of a positively charged material with negatively charged electrons embedded within it.
B.)The atom consists of a nucleus with electrons orbiting randomly around it.
C.)The atom consists of a nucleus with electrons orbiting at specific energy levels. Absorbed photons cause electrons to jump between energy levels.
D.)The atom consists of a nucleus surrounded by a region containing electrons. Electrons cannot be located exactly within this region, but the probability that they will be found in an area can be stated.

Answers

The best description of the Bohr model of the atom is that the atom consists of a nucleus with electrons orbiting at specific energy levels. Absorbed photons cause electrons to jump between energy levels. The answer is letter C.

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