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igomit [66]
3 years ago
15

Thea is doing a chemistry experiment. The instructions say she needs to use pure water. Hamza offer her a bottle labelled “100%

Pure Spring Water”. Suggest why this water is unlikely to be suitable for the experiment [2]
A scientist is comparing 2 samples of the same compound. One is pure and the other is impure. The compound is a solid at room temperature. Explain how the scientist could tell which is the pure compound. [2]

The melting point of pure asprin is 136oC. The melting point of a sample of asprin is measured as being between 128 – 132oC. Give two reasons that suggest the sample is not pure asprin. [2]
Gunpowder is a formulation of potassium nitrate, charcoal and sulphur in the ratio 15 : 3 : 2
What is meant by the term “formulation” [2]
Calculate the mass of charcoal in 40g of gunpowder [1]
if you can just give me hints that would be great
Chemistry
1 answer:
Diano4ka-milaya [45]3 years ago
5 0
How is this going to help us in life wat the fawk
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How many grams of O2 are required to burn 18 grams of C5H12?<br><br> C5H12 + 8O2  5CO2 + 6H2O
DIA [1.3K]
Molar mass :

O2 = 31.99 g/mol

C5H12 = 72.14 g/mol

<span>C5H12 + 8 O2 = 5 CO2 + 6 H2O
</span>
74.14 g ----------------- 8 x 31.99 g
18 g -------------------- ? ( mass of O2)

18 x 8 x 31.99 / 74.14 =

4606.56 / 74.14 => 62.133 g of O2

hope this helps!
4 0
3 years ago
Read 2 more answers
2. Write a balanced chemical equation from the following descriptions.
Kitty [74]

Answer:

AgNO3 + NaCl ---> AgCl + NaNO3

4 0
4 years ago
How many liters of fluorine gas, at standard temperature and pressure, will react with 23.5 grams of potassium metal? Show all o
Sladkaya [172]

Potassium 23.5g/39.0983g/mol = 0.601mol

The Ratio of reactants is 2 to 1 so (0.601mol)/2 = 0.3005mol

Therefore 0.3005mol of F2 is needed to find liters use

formula V = nRT/P (V)Volume = 22.41L

(T)Temperature = 273K or 0.0 Celsius

(P)Pressure = 1.0atm

<span>(R)value is always .08206 with atm n = 0.3005moles (273)(.08206)(0.3005)/1 = V V = 6.7319 Liters</span>

8 0
3 years ago
Read 2 more answers
Tin reacts with nitric acid according to the following equation. What substance is the reducing agent? Sn(s) + 4HNO3(aq) → SnO2(
kipiarov [429]
The reducing agent will go through oxidation reaction and lose electrons then the valence will increase. So the reducing agent in this reaction is Sn(s).
3 0
4 years ago
Read 2 more answers
Explain the Anchoring Phenomenon (summary)
Virty [35]
An anchoring phenomenon anchors all of the learning within a unit. So, it is a unit level event that the classroom is trying to make sense of as they engage in a series of lessons.

Since the questions the students ask about the anchor drive the learning within the unit, the anchor should be complex and require an understanding of several big science ideas to explain.

At strategic moments, the class revisits the anchoring phenomenon to review their initial questions to see which they have answered, which they are making progress on, and what new questions they may have to help us continue learning about the phenomenon.

Throughout the unit, the classroom and each student should be given opportunities to share their thinking and how it relates to the anchoring phenomenon.
YOU SHOULD PUT IT IN YOUR OWN WORDS THOUGH <3
3 0
3 years ago
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