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Damm [24]
3 years ago
5

What is a group in the periodic table of elements?

Chemistry
2 answers:
chubhunter [2.5K]3 years ago
3 0

Answer:

B. The elements that have similar densities and atomic sizes

Explanation:

xeze [42]3 years ago
3 0

Answer:

carbon

Explanation:

just took the quiz

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____H3PO4 + ____ KOH --> ______K3PO4 + ____H2O can someone please balance that chemical equation?
Murrr4er [49]

Answer:

H3PO4 + 3KOH ----> K3PO4 + 3H2O

Explanation:

The valency of K element is + 1 while that of PO4 compound is -3

Hence, at least 3 K atoms are needed to combine with PO4 to form K3PO4 compound.

Hence, the revised equation will be

H3PO4 + 3KOH ----> K3PO4 + 3H2O

Now, the number of atoms and charges of each element is a given equation are equal on both the left and right hand side.

6 0
3 years ago
A negative △H means an exothermic reaction.<br><br> True<br> False
Nostrana [21]
Your answer is False I think
6 0
3 years ago
) If I have 223.4 grams of iron, how many moles of iron do I have?
Natalija [7]

Answer:

Number of moles of iron are 4 mol.

Explanation:

Given data:

Mass of iron = 223.4 g

Number of moles = ?

Solution:

Molar mass of iron = 55.85 g/mol

Formula:

Number of moles = mass/molar mass

Number of moles = 223.4 g/ 55.85 g/mol

Number of moles = 4 mol

3 0
3 years ago
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5 0
2 years ago
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Which of the following are held together by nonpolar covalent bonds?
DaniilM [7]
The atoms of chlorine are held together by non-polar covalent bonds. Covalent bonds are formed between two or more atoms having zero or very small electronegativity difference. For homonuclear molecules where the two bonding atom are of the same kind, the electronegativity difference is zero.
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3 years ago
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