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Svet_ta [14]
3 years ago
6

Physical Changes

Chemistry
1 answer:
Talja [164]3 years ago
7 0
C. Physical changes do not change the identity of a substance, only the physical appearance such as shape or form. If you break a pencil in half, it is still composed of the same material and therefore keeps its identity as the substance it was before the physical change. Phase changes, such as ice melting, is also a physical change because it changes form. But ice is still made of H20 just like water and steam are comprised of H20.
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Need help figuring out these questions did I do them right
Bas_tet [7]

Answer:

The answer to your question is: more less

Explanation:

I suggest you these answers:

a)     PCl₅ (s)     ⇒    PCl₃ (s)  + Cl₂ (g)

b)  ZnBr₂ (aq) + Li₃CO₃ (aq)  ⇒  ZnCO₃ (s)  + LiBr (aq)

c) C₂H₄  + O₂   ⇒    CO₂ (g) + H₂O (l)

Do you have to balance them?

8 0
3 years ago
What does this picture represent?
Sunny_sXe [5.5K]
This picture represents electrons
4 0
2 years ago
Read 2 more answers
How many grams of \text{NaCl}NaClstart text, N, a, C, l, end text will be produced from 18.0 \text{ g}18.0 g18, point, 0, start
Nezavi [6.7K]

Answer:

18.7887 g of NaCl

Explanation:

<em>The question reads - How many grams of NaCl will be produced from 18.0 g of Na and 23.0 g of Cl2?</em>

Let us start by writing out the balanced equation of the reaction:

Na + Cl2 ---> NaCl2

1 mole, each of Na and Cl2 is required to produce 1 mole of NaCl.

mole = mass/molar mass

Therefore

18 g of Na = 18/23 = 0.7826 mole

23 g of Cl2 = 23/71 = 0.3239 mole

In this case, the Na is in excess and the Cl2 becomes the limiting reagent. Hence

0.3239 mole of Cl2 will react with 0.3239 mole of Na to yield 0.3239 mole of NaCl.

mass of 0.3239 mole NaCl = 0.3239 x 58 = 18.7887 g

<u>Hence, 18.7887  grams of NaCl will be produced from 18.0 g of Na and 23.0 g of Cl2.</u>

3 0
3 years ago
Is cocoa mix a solubility
rusak2 [61]
No, pure cocoa powder is not very soluble. A hot cocoa mix will dissolve well under warm temperatures.
3 0
2 years ago
Sodium bicarbonate is sometimes used to neutralize acid spills. If 2.0 L of 1.0 M H2SO4 is spilled, what mass of sodium bicarbon
UkoKoshka [18]

Answer:

168.0 g

Explanation:

First thing, write a balanced chemical equation:

H_{2}SO_{4}+ 2NaHCO_{3}  ----> Na_{2}SO_{4} + 2H_{2}O+2CO_{2}

n(H2SO4) = concentration * volume

                = 1.0 M * 2.0 L

                = 2.0 mol

According to the balanced equation, 1 mol of acid requires 2 mol of sodium bicarbonate. This means that 2 mol of acid requires 2 mol of sodium bicarbonate. What mass of sodium bicarbonate is this?

mass (NaHCO3) = number of moles * molar mass

                           = 2.0 mol * 84.0065 g/mol

                           = 168.0 g

4 0
3 years ago
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