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Answer:

The student can evaporate the liquid water.

Explanation:

The student only mixed water with the powdered tea. Therefore, if the water is evaporated from the mixture, the student will be left with the tea mixture only.

Answer:

C

Explanation:

Elements in the same groups have similar chemical/physical properties. The reason the answer isn't electron configuration is that if this was the case, there would be no reason for transition metals to exist as they can have a varying amount of electrons in their outer shell.

For example, all alkali metals (Group 1) turn into positive ions when reacting and Halogens (Group 7) all turn into negative ions after reacting.

Answer:

speed = wavelength × frequency

wavelength = Speed/frequency

wavelength = 2.998 x 10^8 m/s ÷ 6.1 x 10^9 Hz

wavelength = 0.049m

[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]

Convection is a method of heat transfer that causes heat to be transferred from one object to another object with being in actual contact but I same atmosphere.

So, the correct phenomenon that describes how heat is transferred by Convection is :

Statement 2. Warmer air rises and copl air sinks.

According to Gay lussac's law

[tex]\\ \rm\Rrightarrow P\propto T[/tex]

But according to Boyles law

[tex]\\ \rm\Rrightarrow P\propto \dfrac{1}{V}[/tex]

If volume is decreased by 4 times then pressure is increased by 4times

Answer:

ethanol

Explanation:

it is a thermometric liquid

Some applications of fission reactions are as a zero-waste energy source for generating large amounts of heat and as the energy source in nuclear weapons.

Nuclear fission reactions are reactions in which the nucleus of heavier atoms are split into two or more atoms of smaller nucleus with the release of energy and radiation.

Some of the applications of fission reactions are as a zero-waste energy source for generating large amounts of heat and as the energy source in nuclear weapons.

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The hydrocarbons that will undergo substitution reactions with chlorine would be those that are saturated.

They are hydrocarbons that contain no double or triple carbon to carbon bonds.

Such hydrocarbons cannot undergo addition reactions unlike those that contain double or triple bonds.

Alternatively, saturated hydrocarbons are able to undergo substitution reactions with chlorine in the presence of light, with hydrogen being displaced in the process.

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Answer:

c.

Explanation:

The oldest insect fossil has been proposed to be Rhyniognatha hirsti, estimated to be 400 million years old, but the insect identity of the fossil has been contested. Global climate conditions changed several times during the history of Earth, and along with it the diversity of insects.

Answer:C

Explantion:This is The oldest insect fossil has been proposed to be Rhyniognatha hirsti, estimated to be 400 million years old

The boiling point of hydrocarbons generally increases as the size of the molecules increases because more bonds are needs to be broken in larger organic molecules.

Hydrocarbons are organic compounds which here composed of hydrogen and carbon alone.

Hydrocarbons are grouped into families or homologous series based on a reactive group known as the gincyiial group

The homologous series include

The boiling point generally increases as the size of the molecules increases because more bonds are needs to be broken in larger organic molecules.

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Answer:

Answer might be Water...

A surface with a high reflectivity or low heat conductivity typically warms up at the slowest rate. Ice, snow, and some metals, like aluminium, are examples.

A smooth surface is one that doesn't have any ridges or other surface imperfections. It is smooth and devoid of any roughness, dents, or lumps. This kind of surface, which is highly reflective, is frequently seen in materials like glass, polished metal, or plastic. Rough texture: An uneven or irregular texture is indicative of a rough surface. It has lumps, ridges, or other abnormalities that microscopically obstruct the smoothness. Rough surfaces reduce the reflecting qualities of light by scattering it in many directions. Wood, concrete, or coarse fabrics are a few examples of rough surfaces.

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This is because convection is energy transfer by currents of moving liquid or gas.

Heat transfer by convection is the transfer of heat from one place to another due to the movement of fluid.

When cooking in a convection oven, for best results you place your food in the center of the oven, this is because convection is energy transfer by currents of moving liquid or gas.

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This is because convection is a type of energy transfer by currents of moving liquid or gas (Option A).

Convection is a physical natural phenomenon associated with energy transfer through a fluid.

In convection, a suitable fluid that produces what transfer can be for example air and/or water.

In conclusion, this is because convection is energy transfer by currents of moving liquid or gas (Option A).

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Currently, fossil fuels meet the 80% of needs of the society. But it is a non-renewable source, and it will extinct soon. The leading renewable source is wind power.

Non-renewable energy are the energies that will require a thousand of years to make and ones extinct, will not be prepared.

Renewable energy sources can be prepared again and again, examples are wind, solar, hydropower.

Thus, the fossil fuel and wind power is the leading source of energy that meets the needs of society.

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Answer:

A physical change is when something changes on the inside, but it does not change what it is made of.

Answer: The volume decreases

Explanation:

Because 4C is a cold temperature and atoms inside the water start to move slowly and begins to cange into a solid formation.

The density of the water increases and it is maximum at 4 degrees Celsius.

The temperature at which the liquid and solid states of the substance are in equilibrium at atmospheric pressure .

freezing point of water is 0° Celsius or 32° Fahrenheit.

Though liquids expand on heating water does not expand between 0°C to 4°C instead it contracts as water has maximum density at 4°C.

Thus the option C is the right answer , The density of the water increases as water is heated from 0 degree Celsius to 4 degree Celsius

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Isopropanol burns in oxygen to yield carbon dioxide, water, and heat. the word equation that best represents this chemical reaction is isopropanol oxygen ---> carbon dioxide + water + heat. Option C. This is further explained below.

Generally, A chemical reaction is simply defined as a process that converts compounds known as reactants into distinct substances, known as products.

In conclusion, In the presence of oxygen, isopropanol burns to produce carbon dioxide, water, and heat. This chemical reaction is best represented by the word equation isopropanol oxygen= Carbon dioxide + water + heat

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Answer:

C: isopropanol + oxygen -> carbon dioxide + water + heat

Answer:

c) Sodium chloride

Answer:

cloths/sponges can harbor harmful pathogens and spread germs if not cleaned frequently. A damp, smelly dish cloth/sponge is telling you germs are multiplying!

Explanation:

hope this is able to help you :)

Answer:

is agriculture that makes healthy food,healthy soil,healthy plants and healthy environments a priority,along with crop productivity

Answer:

According to the equation below salt is produced by BaH2s

Answer:

I think b is the correct answer

Answer:

C but read the limitation

Explanation:

Gold sample

Color wouldn't tell you much. In fact it may fool you. Fool's Gold is the same color as gold.

Gold is very malleable. That's what hitting gold with a hammer will do.  It tends to shape the gold without destroying it into lots of pieces. A lot of yellow things have that property.

If only it was that simply. Yes if you are sure there is gold in that location. You have to pick this answer, because the other 2 don't work. So this is possible, but not the best way. The best way is to subject the sample to chemical treatment. If you are left with a yellow sample, then you could make the case for it being gold.

At STP

So

Apply Boyles law

Answer:

Hess’s Law describes how the __Heat__ energy of a reaction consists of the _Enthalpy__ of the energy changes of the individual step reactions

Explanation:

Hess law is a legendary law which is given by

[tex]\\ \rm\Rrightarrow ∆H_{net}=\sum \delta H_r[/tex]

The option that would lead to the formation of precipitation, release of energy or change in color  is : Chemical change

Chemical changes leads to the formation of precipitate in the form of bubbles, release of energy or change in color for example :

Hence we can conclude that The option that would lead to the formation of precipitation, release of energy or change in color  is : Chemical change

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The structure that corresponds to the molecule name - 4-heptanol would be option A.

The name, 4-heptanol, indicates that there are 7 carbon atoms in the structure.

In addition, there is also an indication that there is a functional group on the 4th carbon - the alcohol functional group.

Option B has only 6 carbon atoms instead of 7. Option A, on the other hand, fulfills all the criteria.

Thus, A is the correct structure of 4-heptanol.

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Answer:

it is determined from known oxidation states of other elements