Heating devices can be made by passing an electric current through a conductor of:


high resistance
low resistance
high conductivity
low conductivity

Answer:

higher temperatures increase the speed of solubility

Explanation:

This is because if the temperature of liquid is high and you place a solute inside it dissolves faster than a low temperature

Higher temperature increases the speed of solubility affect the speed with which the solute dissolves. Therefore, option A is correct.

The term solubility is defined as the maximum amount of a substance that will dissolve in a given amount of solvent at a specific temperature.

Based on the concentration of solute dissolves in a solvent, solutes are divided into highly Soluble, sparingly Soluble or insoluble substance.

When a solvent is heated, the molecules gain kinetic energy. Because of the increased rapid motion, the solvent molecules collide with the solute more frequently and with greater force. Both factors accelerate the solute's dissolution.

This is because if the temperature of the liquid is high and a solute is placed inside, the solute dissolves faster than if the temperature is low.

Thus, option A is correct.

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Answer: The phenomenon of osmosis can be seen in the surrounding as the when the raisins are put into water overnight. The water enters the raisins and it swells.

The osmosis can be defined as the biological phenomenon by which the water or any other liquid enters from an area of its higher concentration to an area of its lower concentration via semi permeable membrane.

Diffusion can take place in between gases and in between gases and liquid.

Exchange of gases in the lungs is an example of diffusion in liquids and burning an incense stick in the room is an example of diffusion in gases.

Explanation:

96.485 columbs=1 faraday will

deposit 64/2g= 32 g cu ion

therfore it will require

96,485 ×2/32 =? coulombs or 1/16 of

Faraday= 1 / 16 mole of electrons .

Answer:

A. 2Al(s) + 3Cl2(g) —> 2AlCl3(s)

B. 2Li(s) + 2H2O(l) —> 2LiOH(aq) + H2(g)

C. H2(g) + Br2(l) —> 2HBr(g)

Explanation:

A. Reaction between aluminium metal and chlorine gas.

Al(s) + Cl2(g) —> AlCl3(s)

The above equation can be balance as follow:

There are 2 atoms of Cl on the left side and 3 atoms on the right side. It can be balance by putting 3 in front of Cl2 and 2 in front of AlCl3 as shown below:

Al(s) + 3Cl2(g) —> 2AlCl3(s)

There are 2 atoms of Al on the right side and 1 atom on the left side. It can be balance by putting 2 in front of Al as shown below:

2Al(s) + 3Cl2(g) —> 2AlCl3(s)

Now the equation is balanced.

B. Reaction between lithium metal and liquid water.

Li(s) + H2O(l) —> LiOH(aq) + H2(g)

The above equation can be balance as follow:

There are 2 atoms of H on the left side and a total of 3 atoms on the right side. It can be balance by putting 2 in front of H2O and 2 in front of LiOH as shown below:

Li(s) + 2H2O(l) —> 2LiOH(aq) + H2(g)

There are 2 atoms of Li on the right side and 1 atom on the left side. It can be balance by putting 2 in front of Li as shown below:

2Li(s) + 2H2O(l) —> 2LiOH(aq) + H2(g)

Now, the equation is balanced.

C. Reaction between gaseous hydrogen and liquid bromine.

H2(g) + Br2(l) —> HBr(g)

The above equation can be balance as follow:

There are 2 atoms of H on the left side and 1 atom on the right. It can be balance by putting 2 in front of HBr as shown below:

H2(g) + Br2(l) —> 2HBr(g)

Now the equation is balanced.

Answer:

10⁻³⁶ s

Explanation:

There is much speculation, but many scientists believe the universe started expanding about 10⁻³⁶ s  after the Big Bang.

Answer:

Na

Explanation:

Answer:

It is Rb!!

for plato users

Monomers and polymers

Most large biological molecules are polymers, long chains made up of repeating molecular subunits, or building blocks, called monomers.

The long chains formed by the process of polymerization are called monomers.

In biological macromolecules, polymerization is the chemical process through which relatively tiny and smaller molecules, known as monomers, unite to form a very big chainlike or network of molecules known as a polymer.  

These monomers undergo reactions with one another to form larger molecules known as polymers. The types of monomers in biological macromolecules include:

Each of these individual monomers is critical to the survival and evolution of life.

Therefore, we can conclude that the long chains formed by the process of polymerization are called monomers.

Learn more about monomers here:

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Answer:

0.04838J

Explanation:

Heat is a form of energy that is transferred from one body to another as the result of a difference in temperature between the bodies , here heat is added to the water as a result of temperature change of 0.364 degreesC

Given:change in temperature=0.364

Mass of water=0.0318g

But we need specific heat capacity of water which is

4.2 J/g°C

Then we can calculate How much heat is added by using below formula

Energy = Mass * specific heat capacity *(change in temperature)

energy =0.0318g* 4.18g*0.364

=0.04838J

Answer:

A. 1s²2s²

B. 1s²

C. 1s²

D. 1s²2s²2p⁶

Explanation:

The valency electron is the outer electron of an element. The valency electron resides in the outermost region of the shell.

Using the general configuration for the first 20 elements 2 8 8 2 the valency electrons can be identified.

A. 1s²2s²2p⁶3s² . The valency electron here are 2p⁶ and 3s² . Removing the valency electron we have 1s²2s²

B. 1s² 2s² 2p⁶. After removing the valency electron the configuration will be 1s².

C.1s²2s². After removing the valency electron the configuration will be 1s²

D.1s²2s²2p⁶3s¹. Removing the valency electron the electron configuration will be 1s²2s²2p⁶

Answer:

You have 1680 grams of urea. It means (in it) there are 787 grams of nitrogen, 112 grams of hydrogen, 336 grams of carbon, and 448 grams of oxygen.

Explanation:

Answer:

64.9 L

Explanation:

pls mark as brainliest

Answer:

The answer is 17.75%.

Explanation:

We are given [tex]NH_{3}[/tex] (ammonia) as a chemical formula. We want to find the percent composition of the formula.

We are given the atomic masses of each element: [tex]H = 1.008 amu[/tex] and [tex]N = 14.01 amu[/tex]. Then, we need to find out how many atoms are present of each element in the compound.

N has one atom (no subscript present). H has three atoms (subscript of 3 is present).

Now, we simply multiply the masses of each element by the number of atoms present of that element.

[tex]H = 1.008amu * 3atoms = 3.024amu[/tex]

[tex]N = 14.01amu * 1 atom = 14.01 amu[/tex]

Then, we add up those products to get the mass of the formula.

[tex]3.024amu + 14.01amu = 17.034amu[/tex]

Finally, we divide the masses of each element by the mass of the formula to get the percentages of each element present in the compounds.

For hydrogen:

[tex]\frac{3.024amu}{17.034 amu} =0.1775[/tex]

[tex]0.1775 * 100 = 17.75[/tex]

Hydrogen atoms account for 17.75% of the compound.

For nitrogen:

[tex]\frac{14.01amu}{17.034amu} = 0.8225[/tex]

[tex]0.8225 * 100 = 82.25[/tex]

Nitrogen atoms account for 82.25% of the compound.

For an extra step, add up the percentages to make sure you get within 100 ± 0.01. Otherwise, you may have rounded incorrectly or miscalculated somewhere within your work.

Hope this helps!

Answer:

114

Explanation:

bottom number minus top number. just did the test

Answer:

Na2SO3 + H2O2 = Na2SO4 + H2O

The ionic equation of hydrogen peroxide reacting with sodium sulphide is Na₂SO₃ + H₂O₂ = Na₂SO₄⁻ + H₂O⁺.

A chemical equation known as an ionic equation expresses the constituents in an aqueous solution as dissociated ions. The ionic equation is written by using charge in them.

An example is  "NaCl" is "Na⁺ + Cl⁻".

To write an ionic equation, we should write by dissolving all soluble ionic chemicals into their corresponding ions. To demonstrate that an ion is present in the solution, it should be displayed with its charge and an (aq).  There is also a use of coefficient.

The reaction should be written as:

HS₂O₄ → 2H+ + (SO₄)²⁻

NaOH → Na+ + (OH)-

Na₂SO₄ → 2Na+ + (SO₄)²⁻

H2O exists in the molecular form

So we get 2H+ + (SO₄)²⁻ + 2Na+ + 2(OH)- →2Na+ + (SO₄)²⁻ + 2H₂O

Thus, the ionic equation is Na₂SO₃ + H₂O₂ = Na₂SO₄ + H₂O.

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Answer:

They are all alkali earth metals.

Explanation:

Their valence shell each has 2 electrons. Also, they are all shiny, silvery-white, somewhat reactive metals at standard temperature and pressure. They form alkaline solutions, hydroxides, when reacting with water and their oxides are found in the earth’s crust.

Answer:

magnesium (Mg)

Explanation:

Answer:

3,5-dimethyl-2-octene

Explanation:

The parent chain will be choosen based on the highest value. In this case, if we count from top to bottom, we'll get seven carbon, however if we count from the second carbon, going left and then down, we'll get eight carbon. So the parent chain is octene

The double bond is located at the second carbon and the methyl groups are located on carbon 3 & 5. Since there are two methyl groups, we add di- in front of methyl to indicate two methyl groups present.

Note: The functional group has to be prioritise and it needed to be a part of the parent chain. In this case, the functional group is the double bond. (alkene)

Answer:

210

Explanation:

according to vectors since they are in two different direction u minus them

F1 =10 F2=220

F1 has a forward direction

while f2 goes backward

Answer:

-210N

Explanation:

you say acting force minus opposing force 10N-220N= -210N

Answer: The total pressure of the mixture is 2.76 atm

Explanation:

According to Dalton's law, the total pressure is the sum of individual pressures.

[tex]p_{total}=p_A+p_B+p_C...[/tex]

Given : [tex]p_{total}[/tex] =total pressure of gases = ?

[tex]p_{O_2}[/tex] = partial pressure of oxygen = 0.00461 atm

[tex]p_{N_2}[/tex] = partial pressure of nitrogen = 1.78 atm

[tex]p_{Ar}[/tex] = partial pressure of argon = 0.975 atm

putting in the values we get:

[tex]p_{total}=0.00461atm+1.78atm+0.975atm[/tex]

[tex]p_{total}=2.76atm[/tex]

Thus the total pressure of the mixture is 2.76 atm

Answer:

234.9 grams

Explanation:

Hope this helps

Answer:

this option is the correct they move to an area with lower oxygen concentration because gas molecules can pass through semi-permeable and do not need transport proteins for the movement

Explanation:

i hope this will help you

can confirm that

They move to an area with a lower oxygen concentration

if the correct answer :)))

Explanation:

ape-x

Answer:

Structural formula shows the atoms and bondsin an organic compound.

Explanation:

Structural formula of methane shows

1 Carbon atom is singly bonded to 4 hydrogen atoms.

Answer:

Oxygen Doesn't change

However, Li is oxidized (0 to +1), Na is reduced (+1 to 0)

Explanation:

On reactant side, Oxygen has -2 oxidation charge because we know common oxidation states such as oxygen -2, hydrogen +1 etc.

So NaOH, O is -2, H is +1, so Na has to be +1 to equal total charge of compound

In product side, LiOH, again O has to be -2, H is +1, so Li +1 as well..

We see that oxygen oxidation state doesn't change. However, for Li it becomes oxidized going from 0 to +1 whereas, Na is reduced going from +1 to 0.

vice versa: atoms are elements, so elements are made of atoms specifically 1 atom or multiple of the same kind

Answer:

Vibration.

Explanation:

Answer:

vibration best describes it

Explanation:

Answer:

-169°C to -104°C

Explanation:

Ethene, also known as ethylene exists in solid, liquid and gaseous states. Ethene is an aliens with condensed structural formula C2H4. Athens is a colourless gas. It is flammable and is also a sweet smelling gas in its pure form. It is the monomer in the production of polyethylene which is of great importance in the plastic industry. In agriculture, it is used to induce the ripening of fruits. It can be hydrated in order to produce ethanol.

The liquid range of ethene refers to the temperatures at which ethene is found in the liquid state of matter. It is actually the difference between the melting point and the boiling points of ethene. Hence the liquid range of ethene is -169°C to -104°C

Answer:

B and BBr3

Explanation:

1) 3HBr + B = BBr3 + H2 (double all equation because H2)

2) 6HBr + 2B = 2BBr3 + 3H2

Answer:

The advantages of the pig's heart over the heart formed by the stem cells is that they come in many size so it is possible to have heart for every age group of people.

There are less chances of rejection as pigs also are mammals and moreover there will be no ethical issues as such because a huge number of pigs are slaughtered everyday for human consumption and if their heart can be used for some beneficial purpose it would be good cause.

The risks related to stem cell transplantation includes tumour formation, rejection of the transplanted stem cells, infection and haemorrhage which can be quite risky for the patients.

It is not that pig's heart is always acceptable but the chances are less as compared to stem cell.

Answer:

A = 8

B = 8

C = Oxygen (O)

D = 26

E = 30

F = Iron (Fe)

Explanation:

protons    neutrons    atomic number    mass number     element

A               7                 B                           15                        C

D               E                 26                         56                       F

mass number = protons + neutrons

E = 56 - 26 = 30

A = 15 - 7 = 8

protons = atomic number

B = 8

D = 26

From atomic number:

C = Oxygen (O)

F = Iron (Fe)

Answer:

8

8

o

26

30

fe

Explanation:

edge 21