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erik [133]
3 years ago
11

A teacher wants to perform a classroom demonstration that illustrates both chemical and physical changes. Which

Chemistry
2 answers:
wariber [46]3 years ago
5 0
It would be dissolving sugar in water/burning a candle
NeX [460]3 years ago
3 0

Answer:

dissolving sugar in water

burning a candle

Explanation: these both have chemical and physical changes happening to them.

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Plz Answer all three questions thx ;)
rosijanka [135]
How do scientist communicate their results and conclusions?
6 0
3 years ago
If a sample of pure cadmium has a mass of 18.2 grams, how many moles of cadmium are in the sample?
Mars2501 [29]
Atomic mass cadmium = 112.41 amu

1 mole Cd ------------ 112.41 g
?? moles Cd --------- 18.2 g

18.2 x 1 / 112.41 => 0.161 moles of Cd

hope this helps!
3 0
3 years ago
If water has no color, why does your hair get darker when water makes contact with it?
Simora [160]

Answer:

The water makes your individual hairs stick close together. ... When more light is absorbed by your wet hair, less light gets reflected back to your eyes. The result is that your hair appears darker than when it's dry.

6 0
3 years ago
Using the Rydberg formula, calculate the initial energy level when an electron in a hydrogen atom transitions into n= 2 and emit
EleoNora [17]

Answer:

1

Explanation:

Using the Rydberg formula as:

\frac {1}{\lambda}=R_H\times Z^2\times (\frac {1}{n_{1}^2}-\frac {1}{n_{2}^2})

where,

λ is wavelength of photon

R = Rydberg's constant (1.097 × 10⁷ m⁻¹)

Z = atomic number of atom

n₁ is the initial final level and n₂ is the final energy level

For Hydrogen atom, Z= 1

n₂ = 2

Wavelength = 410.1 nm

Also,

1 nm = 10⁻⁹ m

So,

Wavelength = 410.1 × 10⁻⁹ m

Applying in the formula as:

\frac {1}{410.1\times 10^{-9}}=1.097\times 10^7\times 1^2\times (\frac {1}{n_{1}^2}-\frac {1}{2^2})

Solving for n₁ , we get

n₁ ≅ 1

3 0
3 years ago
Read 2 more answers
Please answer quickly ​
Stolb23 [73]
Inherited it from his grandfather
8 0
2 years ago
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