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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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Nuclear power plants use a fission reaction of uranium to generate heat to power a generator. A fission reaction is a chain reac
LekaFEV [45]
ANSWER
B.

Explanation : it’s B because the control rods used are usually made of boron which boron is a non fissile material hence won’t undergo fission when bombarded or collided with neutrons.
7 0
1 year ago
What is the percentage of s-character in an sp hybrid? O 25% 50% o 75% O 66%
marishachu [46]

Answer: 50%

Explanation:

The number of electron pairs are 2 for hybridization to be sp and the electronic geometry of the molecule will be linear.

1. percentage of s character in sp hybrid orbital =\frac{\text {number of s orbitals}}{\text {total number of orbitals}}=\frac{1}{2}\times 100=50\%

2. percentage of s character in sp^2 hybrid orbital =\frac{\text {number of s orbitals}}{\text {total number of orbitals}}=\frac{1}{3}\times 100=33.3\%

3. percentage of s character in sp^3 hybrid orbital =\frac{\text {number of s orbitals}}{\text {total number of orbitals}}=\frac{1}{4}\times 100=25\%

Thus percentage of s-character in an sp hybrid is 50%.

8 0
3 years ago
The number used to measure distances outside of our solar system is a(n)
nevsk [136]

Answer:

Usually light years, or parsecs.

Explanation:

3 0
3 years ago
Please help, i will mark you as brainliest​
Mrrafil [7]

Answer:

The order of reactivity of metals is as follows, Potassium > Sodium > Lithium > Calcium > Magnesium > Aluminium > Zinc > Iron > Copper > Silver > Gold.

Explanation:

The reactivity of elements (metals) towards water decreases towards the right in a period. It also increases down the group. But zinc is more reactive towards water than iron. Hence the correct order is:

Iron<Zinc<Magnesium<Sodium

4 0
2 years ago
Read 2 more answers
Reliable results are results that can be...<br> A: communicated<br> B: evaluated<br> C: duplicated
insens350 [35]
Reliable results are results that can be... A: Communicated
4 0
3 years ago
Read 2 more answers
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