CHEMISTRY HIGH SCHOOL

Boyle’s law states that the volume of a gas is inversely proportional to its pressure if theA. temperature and number of particles are constant.
B. temperature reaches absolute zero.
C. number of particles decreases.
D. temperature and number of particles are doubled

Answers

Answer 1
Answer:

Boyle's law states that the volume of a fixed mass of a gas is inversely proportional to its temperature if the temperature and the number of particles are constant.

Further Explanation

Boyles’s law  

  • This gas law states that the volume of a fixed mass of a gas is inversely proportional to its pressure at constant absolute temperature.
  • Therefore, when the volume of an ideal gas is increased at constant temperature then the pressure of the gas will also increase.
  • Mathematically;  Volume α 1/Pressure

                               Vα1/P

  • Therefore, constant k, is = PV

Other gas Laws

Gay-Lussac’s law  

  • It states that at constant volume, the pressure of an ideal gas I directly proportional to its absolute temperature.
  • Thus, an increase in pressure of an ideal gas at constant volume will result to an increase in the absolute temperature.

Charles’s law

  • It states that the volume of a fixed mass of a gas is directly proportional to absolute temperature at constant pressure.
  • Therefore, an increase in volume of an ideal gas causes a corresponding increase in its absolute temperature and vice versa while the pressure is held constant.

Dalton’s law  

  • It is also known as the Dalton’s law of partial pressure. It states that the total pressure of a mixture of gases is always equivalent to the total sum of the partial pressures of individual component gases.
  • Partial pressure refers to the pressure of an individual gas if it occupies the same volume as the mixture of gases.

Keywords: Gas law, Boyles's law, pressure, volume, absolute temperature, ideal gas

Learn more about:

Level: High school

Subject: Chemistry

Topic: Gas laws

Sub-topic: Boyle's Law  
Answer 2
Answer:

Final answer:

Boyle's law states the volume of a gas and its pressure are inversely related, given that temperature and number of particles are constant. Increased pressure leads to decreased volume and vice versa, providing temperature and the amount of gas remains the same.

Explanation:

Boyle's law, part of the field of Physics, specifically the subsection dealing with gas laws in Chemistry, states that the volume of gas is inversely proportionate to its pressure, under the condition that the temperature and number of particles of gas are constant. This means if the pressure of a gas increases, its volume decreases and vice versa. To clarify, let's consider an example. If you have a balloon filled with air (the gas), when you squeeze it (increasing pressure), the balloon gets smaller (volume decreases). However, this law only holds when the temperature and the number of gas particles are constant; no additional gas is added, nor heat.

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How much energy is needed to heat enough water to make a cup of tea (250 ml), if the water is initially at 20.0°C and you want to increase the temperature to 85.0°C? (1.00 mL of water has a mass of 1.00 g.)As the tea in the previous question steeps, it cools from 85.0°C to 75.0°C. How much energy is lost by the tea as it steeps?

Answers

Answer:

Heat Energy needed (Q) = 68250 J

Energy lost (Q') = 10500 J

Explanation:

Applying,

Q = cm(t₂-t₁)............. Equation 1

Where Q = heat  energy needed, c = specific heat capacity of water, m = mass of water, t₁ = initial temperature, t₂ = final temperature.

From the question,

Given: m = 250 g = 0.25 kg, t₁ = 20.0°C, t₂ = 85.0°C

Constant: c = 4200 J/kg°C

Substitute these values into equation 1

Q = 0.25(4200)(85-20)

Q = 68250 J.

Similarly, heat lost

Q' = cm(t₁-t₂)................. Equation 2

Where Q = heat lost

Given: t₁ = 85°C, t₂ = 75°C

Substitute into equation 2

Q' = 4200(0.25)(85-75)

Q' = 10500 J

One major goal of the Progressive movementwas to
(1) balance the federal budget by decreasing
spending
(2) provide unemployment insurance to workers
(3) limit direct citizen control over government
(4) pass laws to help solve economic and social
problems

Answers

Answer:

The correct answer is option 4-pass laws to help solve economic and social problems

Explanation:

Hello! Let's solve this!

The progressive movement was from the decade of 1890 until 1920. The objectives were to eliminate the problems of industrialization, corruption, urbanization.

The correct answer is option 4-pass laws to help solve economic and social problems

Final answer:

The Progressive movement aimed to pass laws to help remedy economic and social problems, rather than balance the federal budget or limit direct citizen control over the government.

Explanation:

The Progressive movement in the United States, which spanned the late 19th to early 20th centuries, primarily focused on making political, economic, and social reforms to better serve the interests of the majority of Americans. The goal of the movement was not to balance the federal budget by decreasing spending nor to limit direct citizen control over government, but to pass laws that could alleviate or address socio-economic issues. Therefore, among the options given, option (4), pass laws to help solve economic and social problems, best describes a major goal of the Progressive movement.

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Which of the following units is a derived unit?
Second
Meter
Density
Ampere

Answers

Answer : The correct option is, Density

Explanation :

S.I : It is known as the international System of Units. It is defined as a scientific method to express the magnitude of the several basics units.

There are seven basic units in the system from which the other units are derived.

The seven base unit are, meter for length, kilogram for mass, second for time, ampere for current, kelvin for temperature, mole for amount of substance and candela for intensity.

As per question, second, meter and ampere are the S.I units but the density is the derived unit.

Density : It is defined as the mass of a substance contained per unit volume.

The unit of mass is kilogram (kg) and the unit of volume is m^3. So, the unit of density will be:

Formula used :

Density=(Mass)/(Volume)=(kg)/(m^3)=kg/m^3

The unit of density is, kg/m^3

Hence, the derived unit is density.
Density because you have to use volume and mass to get it. (Density=mass/volume)

Which of the following tells the computer what to do?a. Internet Explorer
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c. Random access memory
d. Monitor

Answers

The correct answer is B. The operating system tells the computer what to do. It is the software that support's the basic functions of a computer. This includes scheduling tasks, controlling peripherals and executing applications.

Answer:

the answer is b and this how i know

Explanation:

i know that the answer is b because i just did this hope this helps tell me if its wrong it shouldnt be tho

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Answers

So platinum is a transition metal. In general transition metals are reducers, which means they can give the electrons they have, to the sodium atoms. Also in chemistry we look at sub orbitals rather that shells(2,8,8). So due to the energy from heat, the d orbital split as electrons move to a higher energy level. Some of the electrons are given to the sodium ions and therefore the flame changes colour to yellow. 
The excitation of the electrons is caused by them getting energy and so moving up an energy level. This energy is released and the electron returns to it's original state. The energy released, however, does not release in the same direction, but in different/various directions. Therefore the colour of the light changes as some energy is released in the surrounding.

Why are hydrophobic molecules such as fats and oils unable to dissolve in watery solutions?

Answers

Hydrophobic mplecules are unable to fissolve in watery solution becuse they dislike water.

Hydro= water
-phobic= fear

Hydrophobic= fear of water, or disliking water
*Think of it like this:
when you mix oil and water, do they mix, or does oil float at the top?

If your reply is "oil float to the top", then you're right. Oil and water DOES NOT mix together. Hope that help!
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