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Which Is a result of topsoil loss A increase soil fertility B poor crop production C soften soil surface D deposition of aggregate

Answer:

it is Ph of solution that tells you the acdic and basic nature of solution

if PH is lower than 7 the soution is acidic and if PH is larger than 7  the solution is basic

Explanation:

Answer:

A. Ph

Explanation:

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:

112mL

Explanation:

We'll begin by calculating the number of mole in 0.640g of SO2.

This is illustrated below:

Molar mass of SO2 = 32 + (16x2) = 64g/mol

Mass of SO2 = 0.640g

Number of mole of SO2 =.?

Mole = mass /molar mass

Number of mole of SO2 = 0.640/64

Number of mole of SO2 = 0.01 mole

Next, we shall determine the number of mole of O2 required for the reaction. This is illustrated below:

2SO2(g) + O2(g) —> 2SO3(g)

From the balanced equation above,

2 moles of SO2 reacted with 1 mole of O2.

Therefore, 0.01 mole of SO2 will react with = (0.01 x 1)/2 = 0.005 mole of O2.

Therefore, 0.005 mole of O2 is required for the reaction.

Finally, we shall determine the volume of O2 required for the reaction as follow:

Note: 1 mole of a gas occupy 22.4L (22400mL) at stp.

1 mole of O2 occupy 22400mL at stp.

Therefore, 0.005 mole of O2 will occupy = 0.005 x 22400 = 112mL

Therefore, 112mL of O2 is required for the reaction.

Answer:

the answer is C

Explanation:

i did the test on edg and got it right

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:

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:

234.9 grams

Explanation:

Hope this helps

Answer:

c

Explanation:

Answer:

tends to split along bands

Explanation:

Answer: C

Explanation: E2022

Answer:

2 atm

Explanation:

Different symbols have different meanings in chemistry. For example, the symbol Δ = adding energy to the reactants.

To identify whether the reactants combine with a specific pressure, we have to use the symbol atm, in such a case 2 atm.

Hope that helps!

Answer:

Visible light waves

Explanation:

Visible light waves are the only electromagnetic waves we can see. We see these waves as the colors of the rainbow. Each color has a different wavelength. Red has the longest wavelength and violet has the shortest wavelength.

Answer:

alkali metals hydrogen lithium sodium potassium rubidium cesium francium alkaline earth metals beryllium magnesium calcium strontium barium radium group 3 boron aluminium gallium indium thalium carbon family carbon silicon germanium tin lead

Explanation:

i hope this will help you :)

There's Hydrogen and Helium

Then Lithium, Beryllium

Boron, Carbon everywhere

Nitrogen all through the air

With Oxygen so you can breathe

And Fluorine for your pretty teeth

Neon to light up the signs

Sodium for salty times

Silicon

(Phosphorus, then Sulfur) Chlorine and Argon

(Potassium) And Calcium so you'll grow strong

(Scandium) Titanium, Vanadium and Chromium and Manganese

This is the Periodic Table

Noble gas is stable

Halogens and Alkali react aggressively

Each period will see new outer shells

While electrons are added moving to the right

Iron is the 26th

Then Cobalt, Nickel coins you get

Copper, Zinc and Gallium

Germanium and Arsenic

Selenium and Bromine film

Answer:

Fabric is made of cotton.

Explanation:

Hope that helps :)

Answer:

Hey mate your answer is

cotton

hope it helps you

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Answer:

artificial polymer fibers that melt upon heating

Explanation:

Answer:

B. N2

Explanation:

The triple bonds pull the atoms closer together, and since N2 is the only molecule with the triple bond, it is the shortest bond length.

Answer:

B and BBr3

Explanation:

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

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

Answer: When the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation is halved and has its sign changed.

Explanation:

Hess’s law of constant heat summation states that the amount of heat absorbed or evolved in a given chemical equation remains the same whether the process occurs in one step or several steps.

According to this law, the chemical equation is treated as ordinary algebraic expressions and can be added or subtracted to yield the required equation. This means that the enthalpy change of the overall reaction is equal to the sum of the enthalpy changes of the intermediate reactions.

The overall chemical reaction follows:

[tex]CaO(s)+CO_2\rightarrow CaCO_3(s)[/tex]     [tex]\Delta H^o_{rxn}=?[/tex]

The intermediate balanced chemical reaction are:

(1) [tex]Ca(s)+CO_2(g)+\frac{1}{2}O_2(g)\rightarrow CaCO_3(s)[/tex]    [tex]\Delta H_1=-812.8kJ[/tex]  

(2) [tex]2Ca(s)+O_2(g)\rightarrow 2CaO(s)[/tex]     [tex]\Delta H_2=-1269kJ[/tex]

The expression for enthalpy of the reaction follows:

[tex]\Delta H^o_{rxn}=[1\times (\Delta H_1)]+[\frac{1}{2}\times (-\Delta H_2)][/tex]

Hence, when the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation is halved and has its sign changed.

Answer:

A. is halved and has its sign changed.

Explanation:

just took the test on edge

Answer:

Na2SO4 + CaCl2 → 2Na+ SO4 2- + Ca2+ 2Cl-

Hope this helps.

Answer:

2Na+(aq)+SO42-(aq)+Ca2+(aq)+2Cl-(aq)->CaSO4(s)+2Na+(aq)+2Cl-(aq)

Explanation:

Answer:

The answer is option A.

Distilled water

Since all the chemicals that will cause hardness in the water has been removed.

Hope this helps.

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:

-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:

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.

To learn more about the solubility, follow the link;

https://brainly.com/question/29661360

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Answer:

acid rain

Explanation:

When sulfur dioxide combines with water and air, it forms sulfuric acid, which is the main component of acid rain. Acid rain can: cause deforestation.

Answer:

The answer is OXIDATION REACTION.

Answer:

There's no other metal.

Explanation:

Iron reacts only with water and air to get the object rusted. There is no other metal which reacts with iron to get the object rusted.

However,

Zinc can be used to protect Metal from Rusting.

Answer:

this is the answer

Explanation:

If someone tells Atomic mass of oxygen is 16, then it means that One the mass of an atom of a oxygen expressed in atomic mass units is 16 It is approximately equivalent to the number of protons and neutrons in the atom of oxygen (the mass number) or to the average number allowing for the relative abundances of different isotopes of oxygen.

Atomic mass Of oxygen is 15.99u or 15.99 amu.

And the mass no. Of oxygen is 16 because total no. Of protons and neutrons (in oxygen 16) is 16.

8 protons+ 8neutrons

So we can say that mass no. And atomic mass are different things.

Then, the atomic mass of oxygen is not 16 rather 15.99amu or 15.99u

Answer: Water, alcohols, aldehydes, and ketones.

Explanation:

Answer:

Examples of Partially Miscible and Immiscible Liquids: Illustrations of immiscible liquids are cooking oil and water, milk and oil, gasoline and water, and liquid metals and water. There are as well partially miscible liquids such as honey and water, butanol and water, and potassium chloride and water.

Explanation:

Hope it helps

Answer:

D.

The concentration of reactants and the concentration of products are constant.

Explanation:

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