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kotykmax [81]
3 years ago
13

You find a nail on the ground in the parking lot, in a small puddle of water. Rust has formed on the outside of the nail. Was th

is a physical or chemical change? Explain
Chemistry
2 answers:
pantera1 [17]3 years ago
6 0
Something with rust means that it has oxidized which is a chemical change. The reason it is a chemical change is because the iron had a chemical reaction with the oxygen and water which resulted in the creation of a new compound (that is a chemical change). You can't change the nail to not having any rust form because the rust will still exist ( If you clean it the rust will still be there but on another object )
Luden [163]3 years ago
5 0
Physical change. There was no chemical to make the nail rust
You might be interested in
Now molecules: Choose... molecules of H 2 + Choose... molecules of O 2 → Choose... molecules of H 2 O
kirill [66]
Consider this balanced chemical equation:
2 H2 + O2 → 2 H2O
We interpret this as “two molecules of hydrogen react with one molecule of oxygen to make two molecules of water.” The chemical equation is balanced as long as the coefficients are in the ratio 2:1:2. For instance, this chemical equation is also balanced:
100 H2 + 50 O2 → 100 H2O
This equation is not conventional—because convention says that we use the lowest ratio of coefficients—but it is balanced. So is this chemical equation:
5,000 H2 + 2,500 O2 → 5,000 H2O
Again, this is not conventional, but it is still balanced. Suppose we use a much larger number:
12.044 × 1023 H2 + 6.022 × 1023 O2 → 12.044 × 1023 H2O
These coefficients are also in the ratio of 2:1:2. But these numbers are related to the number of things in a mole: the first and last numbers are two times Avogadro’s number, while the second number is Avogadro’s number. That means that the first and last numbers represent 2 mol, while the middle number is just 1 mol. Well, why not just use the number of moles in balancing the chemical equation?
2 H2 + O2 → 2 H2O
6 0
2 years ago
(You do) If you have 47.2 mol of Na available, along with an excess of Cl₂, how many grams of NaCl can you produce?
IrinaVladis [17]

Answer:

2,760 grams NaCl

Explanation:

To find grams of NaCl, you need to (1) convert moles of Na to moles of NaCl (via mole-to-mole ratio from reaction) and (2) convert moles of NaCl to grams (via molar mass from periodic table). The final answer should have 3 significant figures based on the given measurement.

2 Na + Cl₂ --> 2 NaCl

Molar Mass (NaCl) = 22.99 g/mol + 35.45 g/mol

Molar Mass (NaCl) = 58.44 g/mol

47.2 moles Na           2 moles NaCl              58.44 grams

----------------------  x  ---------------------------  x  -------------------------  =
                                   2 moles Na                   1 mole NaCl

= 2,758.368 grams NaCl

= 2,760 grams NaCl

5 0
1 year ago
A student burns 1.50 mol C3H8 according to the following reaction:
g100num [7]

1.50 mol C3H8 X (3 mol CO2 / 1 mol C3H8) X (44.0 g CO2 / 1 mol CO2) = 198 g CO2

3 0
3 years ago
Read 2 more answers
What are valency and radicals
PolarNik [594]
Valency- it means the combing capacity if an element.
<span> radical- it  is an atom, molecule, or ion that has unpaired valence electrons or an open electron shell.
</span>
6 0
3 years ago
Hi I’m kurama have some of my points!
Burka [1]
✨Tysm for the points kurama :)✨
6 0
2 years ago
Read 2 more answers
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