does anybody know the answers to these 3 question???

Answer:

15.438g H2O

Explanation:

First you need to find the reaction equation:

2H2O+2Na=2NaOH + H2

Hydrogen is a diatomic molecule so it will have a subscript of 2 on the right hand side. From there we can balance the reaction.    

Then we can use stoichiometry:

34.2g NaOH * (1 mol NaOH/39.908g NaOH) * (2 mol H2O/2 mol NaOH) * (18.015g H2O/1 mol H20) = 15.438g H2O

It is important that when you use stoichiometry that all your units cancel out until you only have the unit you want.

of or containing water, typically as a solvent or medium.

"an aqueous solution of potassium permanganate"

like water; watery.

"a great hall of aqueous marble"

Answer:

A. Comet

Explanation:

Comet is a object which has a tail  when it passes near the Sun.

A comet is an icy, small Solar System body that warms and begins to release gases when passing close to the Sun, a process called outgassing. This produces an extended, gravitationally unbound atmosphere or coma surrounding the nucleus, and sometimes a tail of gas and dust gas blown out from the coma.

These phenomena are due to the effects of solar radiation and the outstreaming solar wind plasma acting upon the nucleus of the comet. Comet nuclei range from a few hundred meters to tens of kilometers across and are composed of loose collections of ice, dust, and small rocky particles. The coma may be up to 15 times Earth's diameter, while the tail may stretch beyond one astronomical unit.

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Answer:

For every 5 psu increase in salinity, the freezing point decreases by 0.28 degrees Celsius (0.5 degrees Fahrenheit); thus, in polar regions with an ocean salinity of about 32 psu, the water begins to freeze at -1.8 degrees Celsius (28.8 degrees Fahrenheit).

Explanation:

Freezing increases salinity, while melting decreases salinity.

took the test lol

Answer:

If m or n is zero, the reaction is zero order in A or B, respectively, and the rate of the reaction is not affected by the concentration of that reactant. The overall reaction order is the sum of the orders with respect to each reactant. If m = 1 and n = 1, the overall order of the reaction is second order

(m + n = 1 + 1 = 2).

Explanation:

Answer:

A Geminids

Explanation:

Answer:

0.055

Explanation:

Not 100% sure this is right but this is how I got it:

1 mol * 2.44 grams/44.0095 g/mol (44.0095 is one mole of CO2)

Explanation:

Newtons third law.. 100% your answer

Answer:

The answer would be A

Explanation:

If more solvent is added, the solution becomes unsaturated because in principle it is capable of dissolving more solute.

Answer:

J

Explanation:

its J

Answer:

A. is the correct choice.

Explanation:

If there are 70.00 g of Oxygen then it would be molecules, in which there is only 1 option with molecules.

I am NOT professional. There is a chance I am wrong. Please reply to me if I made a mistake.

Answer:

Explanation:How many atoms are in 70.00 grams of oxygen.

Answer:

Mass and speed

Explanation:

Mass and speed determine the amount of kinetic energy an object has. Mass is an intrinsic property of a body.

Mass refers to an intrinsic property of a body. It was traditionally believed to be related to the quantity of matter in a physical body, until the discovery of the atom and particle physics. It was found that different atoms and different elementary particles, theoretically with the same amount of matter, have nonetheless different masses.

Mass in modern physics has multiple definitions which are conceptually distinct, but physically equivalent. Mass can be experimentally defined as a measure of the body's inertia, meaning the resistance to acceleration when a net force is applied. The object's mass also determines the strength of its gravitational attraction to other bodies. The SI base unit of mass is the kilogram.

In physics, mass is not the same as weight, even though mass is often determined by measuring the object's weight using a spring scale.

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Answer:

B. Wrap more coils of wire around the nail

Increasing the number of coils in an electromagnet increases the strength of the magnetic field.

Explanation:

Answer:

153 N left

Hope this helps

Explanation:

Explanation:

A way to maintain good health is from exercise, eating healthy foods, getting enough rest, keeping .The first mention of the phrase 'you are what you eat' came from the 1826 work Physiologie du Gout, ou Medetations de Gastronomie Transcendante, in which French author Anthelme Brillat-Savarin wrote: “Tell me what you eat and I will tell you what your are.”

Answer:

A) 2.2 mol

Explanation:

Given data:

Number of moles of O₂ produced = ?

Number of moles of N₂O₅ decomposed = 4.3 mol

Solution:

Chemical equation:

2N₂O₅    →   4NO₂ + O₂

Now we will compare the moles of N₂O₅ and O₂.

            N₂O₅       :        O₂

             2            :         1

            4.3         :       1/2×4.3 = ×2.2

Thus, from 4.3 moles of  N₂O₅ 2.2 moles of O₂ are produced.

Answer:

https://quizlet.com/259730102/chemistry-unit-10-flash-cards/

Explanation:

Answer:

c- Breaking down rocks

Explanation:

The effect that weathering of the Earth's surface can have is that it can lead to the breaking down of rocks.

In fact, weathering causes the breaking down of rocks.

Weathering is the physical disintegration and chemical decomposition of rocks to form sediments and soils.

By the action of weathering agents. rocks are broken down into tiny bits or turned into chemical solutions.

Answer:

thermal

Explanation:

Answer:

0.72 moles of hydrochloric acid are needed to completely react with 0.36 mol of lead.

Explanation:

The balanced  reaction is:

Pb + 2 HCl → PbCl₂ + H₂

By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of reagent participate:

You can apply the following rule of three: if by stoichiometry of the reaction 1 mole of Pb reacts with 2 moles of HCl, 0.36 moles of Pb will react with how many moles of HCl?

[tex]amount of moles of HCl=\frac{0.36 molesof PB*2 moles of HCl}{1 mole of Pb}[/tex]

amount of moles of HCl= 0.72 moles

0.72 moles of hydrochloric acid are needed to completely react with 0.36 mol of lead.

The moles of HCl needed to completely react with 0.36 mole of lead is 0.72 moles.

Stoichiometry of the reaction tells about the relative amount of the reactants and products present in that reaction in terms of coefficient.

Given chemical reaction is:

Pb + 2HCl → PbCl₂ + H₂

From the stoichiometry of the reaction, it is clear that:
1 mole of Pb = react with 2 moles of HCl

0.36 mole of Pb = react with 2×0.36 = 0.72 moles of HCl

Hence, the required moles of HCl is 0.72 moles.

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According to the mole concept, the mass  of 1.25 moles Ca(OH)₂ is 92.61 grams.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.Mass=number of moles×molar mass=1.25×74.09=92.61 g.

Thus,the mass  of 1.25 moles Ca(OH)₂ is 92.61 grams.

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Explanation:

it is too small to be a planet as the avrage planet size

can be around 20,000 the smallest planet in the solar system mercurey has more than pluto

Answer:

two

Explanation:

The number of significant figures needed in the answer is 2.

This is because when finding the products of two numbers, the result is as accurate as the least number of significant figures of the numbers being multiplied.

Here the numbers being multiplied are;

 1.31m

 6.5m

        1.31m has 3 significant figures

          6.5m has 2 significant figures.

So, the product will have 2 significant figures

Answer:

3.01

Explanation:

Speed=distance/time

=100mtrs/33.2sec

=3.01m/s

Answer:

50662.5

Explanation:

Answer:

790000000

Explanation: