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3 years ago

15

Cats are aliens send to spy on us. Is the statement printed on this poster about cats scientific theory? Explain your answerr, i

ncluding whether you can provide evidence to support the statement

2 answers:

GREYUIT [131]3 years ago

3 0

Answer:

No, there is no evidence or proof that proves the scientific theory. Therefore, the statement is not a scientific theory.

alexdok [17]3 years ago

3 0

Answer:

Well heck. We better run......

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PLEASE HELP ASAP. I WILL MARK BRAINLIEST!!!

iris [78.8K]

I Cant Answer your question but maybe this will help

Volume Changes for Gases

Particles in a gas have more freedom of movement than they do in a liquid. According to the ideal gas law, the pressure (P) and volume (V) of a gas are mutually dependent on temperature (T) and the number of moles of gas present (n). The ideal gas equation is PV = nRT, where R is a constant known as the ideal gas constant. In SI (metric) units, the value of this constant is 8.314 joules ÷ mole - degree K.

Pressure is constant: Rearranging this equation to isolate volume, you get: V = nRT ÷ P, and if you keep the pressure and number of moles constant, you have a direct relationship between volume and temperature: ∆V = nR∆T ÷ P, where ∆V is change in volume and ∆T is change in temperature. If you start from an initial temperature T0 and pressure V0 and want to know the volume at a new temperature T1 the equation becomes:

V1 = [n • R • (T1 - T0) ÷ P] +V0

Temperature is constant: If you keep the temperature constant and allow pressure to change, this equation gives you a direct relationship between volume and pressure:

V1 = [n • R • T ÷ (P1 - P0)] + V0

Notice that the volume is larger if T1 is larger than T0 but smaller if P1 is larger than P0.

Pressure and temperature both vary: When both temperature and pressure vary, the the equation becomes:

V1 = n • R • (T1 - T0) ÷ (P1 - P0) + V0

Plug in the values for initial and final temperature and pressure and the value for initial volume to find the new volume.

6 0

3 years ago

Read 2 more answers

A sample of gas is kept at a temperature of 300 k, a volume of 1.45L, and a pressure of 3.00 kPa. How many moles of has are in t

klasskru [66]

Answer:

the number of moles of the gas is 0.00174 mol.

Explanation:

Given;

temperature of the, T = 300 K

volume of the gas, V = 1.45 L

Pressure of the gas, P = 3.0 kPa

The number of moles of the gas is calculated using Ideal gas equation, as follows;

PV = nRT

Where;

n is number of moles of the gas

R is the ideal gas constant, = 8.315 L.kPa/mol.K

n = PV / RT

n = (3 x 1.45) / (8.315 x 300)

n = 0.00174 mol.

Therefore, the number of moles of the gas is 0.00174 mol.

7 0

3 years ago

Why should you avoid the flammable range for a chemical?

mina [271]

The air is too "rich" to burn above the upper limit, but the situation might soon deteriorate into danger: For instance, increasing the air in a space can quickly reduce the product's vapor percentage to levels that are within its flammability range, which could have explosive effects.

<h3>Why should we handle combustible materials carefully?</h3>

Flammable liquids and gases need to be handled and stored carefully since they have low flash points. Never assume that these items won't catch fire. You must continually keep in mind the safety precautions for handling and storing combustible products if you want to keep both you and your company safe.

<h3>What must be kept out of the vicinity of combustible chemicals?</h3>

To prevent them from getting engaged and stoking a fire, combustible objects including cardboard, paper towels, sawdust, and waste must be kept away from flammable storage spaces. All flammable liquid containers must be kept closed while not in use to further help avoid fires.

learn more about flammable chemical here

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6 0

2 years ago

Which electrons are responsible for the emission of colored lights and how is emission occurring?

densk [106]

Answer:

When the electron changes levels, it decreases energy and the atom emits photons. The photon is emitted with the electron moving from a higher energy level to a lower energy level. The energy of the photon is the exact energy that is lost by the electron moving to its lower energy level.

7 0

3 years ago

Reaccionan 49 gr de acido nitrico , con 36 gr de hidroxido de calcio , en un proceso donde se obtienen 97 gr de nitrato de calci

yan [13]

Answer:

Balanced reaction: 2HNOc + Ca(OH)₂ → Ca(NO₃)₂ + 2H₂O

Limiting reactant: HNO₃

Produced calcium nitrate + Produced water = 63.8 g+ 14 g = 77.8 g

This will be the theoretical yield, so you could not produce 97 g. Something's wrong.

Explanation:

The reactants are HNO₃ and Ca(OH)₂

The products are: Ca(NO₃) and H₂O

This is a neutralization reaction: 2HNO₃ + Ca(OH)₂ → Ca(NO₃)₂ + 2H₂O

We determine the limting reactant (mass / molar mass, to convert to moles):

49 g / 63 g/mol = 0.778 moles of nitric acid

36 g / 74.08 g/mol = 0.486 moles of hydroxide

1 mol of hydroxide reacts with 2 moles of acid

Then, 0.486 will react with (0.486 . 2) /1 = 0.972 moles of HNO₃

We do not have enough acid, because we need 0.972 moles and we have 0.778 moles, therefore the HNO₃ is the limtiing reactant:

Ratio between the nitric acid and nitrate is 2:1, so let's propose a rule of three:

2 moles of acid can produce 1 mol of nitrate

Then, 0.778 moles of acid will produce (0.778 . 1) /2 = 0.389 moles of nitrate

We convert the moles to mass: 0.389mol . 164.08 g / 1mol = 63.8 g

Ratio between the nitric acid and water is 2:2. For 0.778 moles of acid, I can produce the same amount of water. We convert the moles to mass:

0.778 mol . 18 g/mol = 14 g

Produced calcium nitrate + Produced water = 63.8 g+ 14 g = 77.8 g

This will be the theoretical yield, so you could not produce 97 g. Something's wrong.

Percent yield = (produced yield / theoretical yield) . 100

6 0

3 years ago