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Kipish [7]
2 years ago
11

Do ghosts exists ?? ...​

Chemistry
1 answer:
Nesterboy [21]2 years ago
5 0

Answer:

no

Explanation:

it is human imagination about scary things that brought about ghost

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What elements are highlighted:<br> a. Nonmetals<br> b. Metals<br> C. Metalloids
Advocard [28]
Non metals
(It’s both halogens and noble gases ) the other ones which are white(not highlighted) are alkali metals, alkaline earth metals, and transition metals :3
6 0
3 years ago
What is the frequency of a photon with an energy of 3.26 x 10-19 J?
Kobotan [32]

Answer:

B.

from \: eisteins \: energy \: relation :  \\ E = hf  \\ h \: is \: plancks \: constant\\ 3.26 \times  {10}^{ - 19}  = 6.63 \times  {10}^{ - 34 }  \times f \\ f =  \frac{3.26 \times  {10}^{ - 19} }{6.63 \times  {10}^{ - 34} }  \\ f = 4.92 \times  {10}^{14}  \: Hz

8 0
2 years ago
A gas occupies 100 mL at 150. kPa. Find its volume at 200. kPa. You must show all your work to receive credit. Be sure to identi
PtichkaEL [24]

The Boyle-Mariotte's law or Boyle's law is one of the laws of gases that <u>relates the volume (V) and pressure (P) of a certain amount of gas maintained at constant temperature</u>, as follows:

PV = k

where k is a constant.

We can relate the state of a gas at a specific pressure and volume to another state in which the same gas is at different P and V since the product of both variables is equal to a constant, according to the Boyle's law, which will be the same regardless of the state of the gas. In this way,

P₁V₁ = P₂V₂

Where P₁ and V₁ is the pressure and volume of the gas to a state 1 and P₂ and V₂ is the pressure and volume of the same gas in a state 2.

In this case, in the state 1 the gas occupies a volume V₁ = 100 mL at a pressure of P₁ = 150 kPa. Then, in the state 2 the gas occupies a volume V₂ (that we must calculate through the boyle's law) at a pressure of P₂ = 200 kPa.  Substituting these values in the previous equation and clearing V₂, we have,

P₁V₁ = P₂V₂ → V₂ = \frac{P1V1}{P2}  

→ V₂ = \frac{100 mL x 150 kPa}{200 kPa}

→ V₂ = 75 mL

Then, the volume occupied by the gas at 200 kPa is V₂ = 75 mL

6 0
3 years ago
Elements with atomic numbers 7 and 83 have how many valence electrons? *
IRINA_888 [86]

Explanation:

element with atomic numbers 7 and 83 have 5 and 5 valence electrons

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What is the largest contributor to the greenhouse effect?
Sloan [31]

Answer:

burning of fossil fuels

Explanation:

7 0
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