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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 particles are in 5.0 ml of Fe
nordsb [41]

f it is solid iron, use the density to get the mass. D x V = mass  

Use the mass to find the moles of Fe. Mass/atomic mass = moles  

Moles x Avogadro's number will give you the particles, assuming that you mean atoms.

7 0
3 years ago
How many of the electrons in a molecule of ethane are not involved in bondind​
vovikov84 [41]

Ethane consists of 6C−H bonds and 1C−C bond. Total number of bonds is 7. Each bond is made up of two electrons

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7 0
3 years ago
A gas occupies a volume of 650.0 mL when the pressure is 3.50 atm. What will the new volume be if the pressure is reduced to 1.6
Gemiola [76]

The new volume will be 1379 mL.

Explanation:

As per Boyle's law, the product of initial volume and initial pressure of any gas molecule is equal to the product of final volume and final pressure of those molecules.

So here the initial volume is 650 ml and the initial pressure is 3.50 atm. As the temperature is said to be constant, then this system will be obeying Boyle's law. So, the final pressure is given as 1.65 atm. As there is a reduction in the pressure, the volume of the gas is tend to get expanded.

P_{1} V_{1} = P_{2} V_{2}

So, (650*10^{-3}*3.50)=(1.65*V_{2})

V_{2} = \frac{650*10^{-3}*3.50}{1.65} = 1379 mL

So, the new volume of the gas on reduction in pressure is 1379 mL.

7 0
3 years ago
It’s science, the subject is light and color
vladimir1956 [14]

Answer:

22)convex

23)sun (sunlight reflect of the off the surface of the moon

24)because of the way the atmosphere interacts with sunlight

25) transparent : glass,contact lenses,water,air

translucent: wax paper, oil paper, thin sheets

opaque : plastic, wood, leather

26)when light react with opaque: none of it passes though

when it reacts with transparent : it passes through

when it react with translucent : only some of it passes through, the light does not pass directly through the material

Explanation:

24 blue light is scattered in all directions by the tiny molecules of air in earth's atmosphere

8 0
3 years ago
What is the opposite of malleable?<br> A) brittle<br> B) ductile<br> C) insulative<br> D) conductive
inysia [295]

Answer:

A) brittle

Explanation:

5 0
3 years ago
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