Which solution has the same boiling point as 0.25 mol CaCl2 dissolved in 1000 g water?Help Please, Thanks!

0.75 mol sucrose dissolved in 1000 g water
1.0 mol ethylene glycol dissolved in 1000 g water
0.50 mol CaCl2 dissolved in 1000 g water
0.25 mol NaCl dissolved in 1000 g water

Answers

Answer 1

Answer: The boiling point of water at 1 atm is 100 degrees celsius. However, when water is added with another substance the boiling point of it rises than when it is still a pure solvent. This called boiling point elevation, a colligative property. The equation for the boiling point elevation is expressed as the product of the ebullioscopic constant (0.52 degrees celsius / m) for water), the vant hoff factor and the concentration of solute (in terms of molality).

ΔT(CaCl2) = i x K x m = 3 x 0.52 x 0.25 = 0.39 °C
ΔT(Sucrose) = 1 x 0.52 x 0.75 = 0.39 °C
ΔT(Ethylene glycol) = 1 x 0.52 x 1 = 0.52 °C
ΔT(CaCl2) = 3 x 0.52 x 0.50 = 0.78 °C
ΔT(NaCl) = 2 x 0.52 x 0.25 = 0.26 °C

Thus, from the calculated values, we see that 0.75 mol sucrose dissolved on 1 kg water has the same boiling point with 0.25 mol CaCl2 dissolved in 1 kg water.

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If the pressure, volume, and temperature of a gas are known, which can most likely be found by using the ideal gas law

Answers

the ideal gas law equation is as follows

PV = nRT

where P - pressure

V - volume

n - number of moles

R - universal gas constant

T - temperature

so if the pressure, volume and temperature are already known

we are left with n and R

since R is the universal gas constant that has a known fixed value then R too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

A.) the molar amount of gas

Hope it helps!

Carefully looking at an object or process

Answers

observation

They utilize and make use of the scientific method in order to have clear basis and evidence for their investigations. Research method is always used to answer every scientific inquiry and in gaining evidential data or knowledge. The scientific method has the following process or at least undergoes the process of
1. Observation
2. Hypothesis
3. Experimentation
4. Interpretation of data
5. Evaluating the data
6. Passing and recording the data

These steps are crucial and the empirical data that these scientists obtain are very important to keep that is why research paper, thesis and dissertations exists.

In a titration of 0.5 M HCl and an unknown concentration NaOH, 25.0 ml of NaOH was required to completely neutralize 25.0 ml of HCl. What is the concentration of the NaOH?

Answers

When an acid is neutralized by a base, that means moles of H+ = moles of OH-

moles of H+ = 0.5 M * 0.025 L HCl = 0.0125 moles H+

moles of OH- should be equal to 0.0125 moles, so
0.0125 moles = (x) * 0.025 L NaOH

x is the concentration of NaOH, which we want to find.

x = 0.5 M

The correct answer is C) 0.5 M.

List two general properties of molecular compounds

Answers

Molecular compounds often have lower melting and boiling points. Ionic compounds cannot conduct electricity when they are in a solid form.

What are molecular compounds?

Any substance made up of similar molecules with atoms from two or more different chemical elements is referred to as a chemical compound. Atoms from more over 100 specific chemical elements, both in their pure forms and when mixed to form chemical compounds, make up all matter in the universe.

For instance, the atoms that make up carbon differ from those which make it up iron, which differ from the ones that make up gold. Molecular compounds often have lower melting and boiling points. Ionic compounds cannot conduct electricity when they are in a solid form.

Therefore, molecular compounds often have lower melting and boiling points. Ionic compounds cannot conduct electricity when they are in a solid form.

To know more about molecular compounds, here:

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Low melting points and boiling points. ...Low enthalpies of fusion and vaporization These properties are usually one or two orders of magnitude smaller than they are for ionic compounds.Soft or brittle solid forms. ...Poor electrical and thermal conductivity.

Match each energy source with its description.1. most common renewable energy source
2. depends on time of day and time of year
3. most polluting energy source
4. liquid formed from remains of plants and animals
5. renewable source formed from organic material

hydropower
coal
solar
biomass
oil

Answers

The correct matches are as follows:

1. HYDRO POWER: Most common renewable energy source.

Hydro power refers to a type of energy which uses water to produce electricity. This type of energy is derived from the energy of falling water; the energy is used to drive the turbines that generate electricity. The quantity of electricity that can be generated in an hydro power plant depend on the quantity of water available and the height from which the water is falling. Hydro power is a renewable source of energy because of availability of water.

2. SOLAR: Depends on time of day and time of year.

Solar power is the type of electrical power that is derived from the energy of the sun. It is a renewable form of energy and it is considered to be the cleanest and most reliable source of energy. Solar panels are usually used to trap energy from the sun and to convert them to electrical energy. One property of solar power is that, the quantity of solar power that can be obtained depend on the strength of the sun light. On days and time of the year when there is little sunlight, little solar power can only be generated during this time.

3. COAL: Most polluting energy source.

Coal is obtained naturally from underneath the ground through mining. There are different types of coal and these coals were formed millions of years ago. Coal is a non-renewable energy source and is considered to be the most polluting energy source. Burning of coal releases greenhouse gases, which damage the ozone layers. The burning also resulted in production of gases such as carbon monoxide, which brings about acid rain. The extraction of coal also endangered the environment.

4. OIL: Liquid formed from remains of plants and animals.

Crude oil is a natural resource that is obtained from underneath the earth through the process of drilling. Crude oil was formed millions of years ago from the remains of plants and animals. Oil is one of the products that are obtained from the purification of crude oil. Oil is a fossil fuel and it is not renewable. Oil is majorly used to power vehicles and machines. Burning of oil [petrol], results in production of high amount of carbon dioxide and other gases, which pollute the environment.

5. BIOMASS: Renewable source formed from organic material.

Biomass are renewable and energy sources that are formed from organic materials. They are used to create electric power and other forms of power. Examples of materials from which biomass power are derived from are: animal wastes, forest debris, certain waste residues, certain crops and woody fuels. Energy in biomass are released in form of heat when they are burned. The heat is used to power turbines, which generate electricity.

Energy can neither be created nor be destroyed, which can only be transformed into one form or another. The energy obtained from different sources has different properties.

Which of the following energy sources matches correctly with its description?

Hydropower is the most common renewable energy source, in which water is used to generate electricity. The energy is derived from the use of turbines. It is a renewable source of energy due to the availability of water.

Solar energy depends on the day and time of the year. Solar energy refers to energy utilized from the sun's rays. The day and time of the year are important in deriving solar energy.

Coal is the most polluting energy source. It is formed from the remains of fossils billion years ago and produces harmful and toxic gases to the environment when burnt. It is the most common source of air pollution.

Oil is the liquid produced from the dead remains of plants and animals. It is also referred to as crude oil, which is used as fossil fuel and is not renewable.

Biomass is a renewable energy source that is produced from organic materials. Electric power can be generated using biomass. Animals' watches, certain residues, and forest debris are the biomass and when burnt produce heat.

Thus, energy is a vital source required to carry out many actions and activities, which can be obtained from different sources.

Learn more about energy sources here:

brainly.com/question/26035031

Chemicals secreted by glands which regulate tissues or organs are called______

Answers

Chemicals secreted by glands which regulate tissues or organs are called hormones. Endocrine glands are responsible for regulating body activities. Endocrine glands release chemicals that are called hormones which help the body to function properly. the endocrine system regulate many internal processes.

Answer:

Hormones

hope i helped!

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