You should do it often. There you go.
C) The bonding between carbon atoms allows for branches in carbon chains.
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Answer:
oxygen
Explanation:
oxygen ions will be oxidised to form oxygen gas at the anode
Answer:
The molarity of a solution of KCl is 1.33
Explanation:
The Molarity (M) or Molar Concentration is the number of moles of solute that are dissolved in a given volume. In other words, the molarity is the number of moles of solute per liter of solution.
Molarity is determined by the expression:
Molarity is expressed in units ().
So in this case you need to know the number of moles. For that you must know the molar mass of KCl. You know:
- K= 39.10 g/mol
- Cl= 35.45 g/mol
So the molar mass of KCl is: KCl= 39.10 g/mol + 35.45 g/mol= 74.55 g/mol
Then the following rule of three applies: if 74.55 grams of KCl are in 1 mole, 149.2 grams of KCl in how many moles will they be?
moles= 2
So you know:
- number of moles= 2
- volume= 1500 mL=1.5 L (being 1 L=1000 mL)
Replacing in the definition of molarity:
Solving:
Molarity= 1.33
The molarity of a solution of KCl is 1.33
Answer:
The compound is most likely to be MgCl2.
Explanation:
Let the element with 2 valence electrons be X
Element with atomic number 17 is Cl.
The compound formed can be obtained as follow:
1. X will lose the 2 valence electrons to form X^2+ as shown below:
X —> X^2+ + 2e- (1)
2. Two Cl atoms will receive the 2 electrons as shown below:
2Cl + 2e- —> 2Cl- (2)
3. Combine equation 1 and 2.
X + 2Cl 2e- —> X^2+ +2Cl- + 2e-
Cancel out the electrons
X + 2Cl —> X^2+ + 2Cl-
X + 2Cl —> XCl2
Now, X is a group 2 element since it has 2 valence electrons. Therefore, X is most likely to magnesium, Mg.
Mg + 2Cl —> MgCl2.
Therefore, the compound is most likely to be magnesium chloride MgCl2