A chemistry student must write down in her lab notebook the concentration of a solution of sodium hydroxide. The concentration of a solution equals the mass of what's dissolved divided by the total volume of the solution. Here's how the student prepared the solution: The label on the graduated cylinder says: empty weight: She put some solid sodium hydroxide into the graduated cylinder and weighed it. With the sodium hydroxide added, the cylinder weighed . She added water to the graduated cylinder and dissolved the sodium hydroxide completely. Then she read the total volume of the solution from the markings on the graduated cylinder. The total volume of the solution was . What concentration should the student write down in her lab notebook? Be sure your answer has the correct number of significant digits.

Explanation:

Answer:1.067

Explanation:

look it up

Answer:

1) Electron

Explanation:

The mass of an electron is only about 1/2000 the mass of a proton or neutron, so electrons contribute virtually nothing to the total mass of an atom.

Answer:

nanograms - 7310

kilograms - 7.310000000000001e-9

Answer:

Kinetic And Potential Energy Working Together All forms of kinetic energy are the result of a previous state of potential energy. For example, the stored chemical potential energy of a battery converts to electrical kinetic energy to transport electricity to a light bulb, which radiates thermal kinetic energy.

Explanation:

Calcium carbonate is neither acid nor base, it's a SALT.

Answer:

none,It is a salt of the calcium, ion a strong base and carbonic acid, a very weak acid. Answer: calcium carbonate is a salt, it is neither acid nor base

Answer:

88.20%

Explanation:

% yields =( experimental yield /theoretical yield )x100%

           = ( 56.8 ÷ 64.4 ) x100%

            = 88.20%

The percent yield for the given reaction where in the product obtained is 56.8 g is 88.19%.

Percent yield is defined as the ratio of actual yield to the theoretical yield multiplied by 100. If the actual and theoretical yield are same then the percent yield is 100%.If actual yield is less than the theoretical yield then the percent yield is less than 100%.Reason of this condition arising is the incompletion of reaction or loss of sample during recovery process.

In cases where percent yield is over 100% it indicates that more sample is recovered than the predicted amount.This condition arises when there are other simultaneous reactions taking place leading to the formation of product. It can also arise if there is incomplete removal of impurities from the sample .In the given example , percent yield=56.8/64.4×100=88.19%.

Thus, the percent yield of reaction is 88.19 %.

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Answer:

120 cubic meters

Explanation:

Three-dimensional measurement is basically any unit of measurement cubed. Since grams is just to the first power, it is not considered three-dimensional. miles per hour is a fraction, so it is not a three-dimensional measurement of volume. 120 units are to the first power, so you are left with 120 cubic meters, which is a three-dimensional measurement of volume. Also, another way to solve this is to look at the types of measurement. The cubic meter is a measure of volume. Grams are a measurement of mass. Miles per hour is a measurement of speed. Units can be any type of measurement because you can substitute units instead of any measurement in questions.

Answer:

5/3 or 1 2/3 atmospheres.

Explanation:

If the temperature is kept constant then P*V will be constant.

The standard pressure is 1 Atm. so:

250 * 1 = 150 * V

V = 250 / 150

= 5/3 Atm.

The new pressure of gas  is 126.66 mm Hg  at constant temperature according to Boyle's law.

Boyle's law is an experimental gas law which describes how the pressure of the gas decreases as the volume increases. It's statement can be stated as, the absolute pressure which is exerted by a given mass of an ideal gas is inversely proportional to its volume provided temperature and amount of gas remains unchanged.

Mathematically, it can be stated as,

P∝1/V or PV=K. The equation states that the product of of pressure and volume is constant for a given mass of gas and the equation holds true as long as temperature is maintained constant.

According to the equation the unknown pressure and volume of any one gas can be determined if two gases are to be considered.That is,

P₁V₁=P₂V₂

∴P₂=760×250/150=126.66 mm Hg

Therefore, the final pressure  of the gas is 126.66 mm Hg.

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Electrons are negativity charge particle found in an atom. His twine is Proton who is positively charged

Answer:

when you multpily or divide powers of 10 you just add or subratact respectivley

Explanation:

(5.93 x 10 ^ 3) (2.3 x 10^ -2) = (5.93 * 2.3 ) x 10 ^ 3 +(-2)

                                             = 13.639 x 10 ^ 3-2

                                             = 13 . 639 x 10

                                              1.3639 x 10^2

Answer:

Another example of a natural law in physics is Ohm's law that describes the relationship between voltage (V), current (I), and resistance (R). Natural laws are also found within chemistry. One of the most important laws in chemistry is the law of conservation of matter.

Answer:

+1

Explanation:

Sodium has one electron in its outermost shell. Sodium can not be able to accept seven electrons because the energy required for that process is very high. Sodium would rather loose its only valence electron to form a univalent positive ion Na^+.

This is an easier process. When sodium looses one electron, it now has a charge of +1.

Answer:

The answer is Observation.

For you to observe the things around you then you need to use all your sense organs....

Answer: making an observation.

Answer:

The answer is Gain 6 electrons.

Explanation: The reason for this is that for electrons to be stable, you need a valence shell of 8 electrons. Since it is arranged 2, 8, 2 , the outer shell is 6 less than 8 meaning it needs to gain 6 electrons.

Answer:

glycerin

Explanation:

the amind acid of glycrine is 0.18 g/MLA.

Answer:

inertia and force

Explanation:

the inertia allows objects to move and force makes an object move

Answer:

Explanation:

Density of a substance can be found by using the formula

[tex]Density(\rho) = \frac{mass}{volume} [/tex]

From the question we are finding the amount of space the gas will occupy that's the volume of the gas

Making volume the subject we have

[tex]volume = \frac{mass}{Density} [/tex]

From the question

mass = 23.8 g/mL

Density = 0.68 g/mL

Substitute the values into the above formula and solve

That's

[tex]volume = \frac{23.8}{0.68} [/tex]

We have the final answer as

Hope this helps you

Answer:

False

Explanation:

It is important to give exact measurements.

Answer:

A. Condensation

B. Evaporation

Explanation:

Condensation releases energy when water vapor condenses to form water droplets. Evaporation absorbs energy whenever it changes from liquid to gas, the heat from the sun heats the water up and absorbs energy.

The correct answer is 96.80 grams

Explanation:

The density of a substance shows the total mass the substance contains in 1 mL or 1 cm3 as density is calculated by using the formula D= M (mass) / V (volume). This implies, Iron contains 7.87 grams per milliliter. Moreover, this value and formula can be used to calculate the mass or volume of any other sample. The process to calculate the mass of an iron sample with a volume of 12.3 mL is shown below.

D = M ÷ V

7.87 mL = x ÷ 12.3 mL - x represents the missing value. Now find the value of x by solving the equation

x = 7.87 · 12.3  

x = 96.80

This means a sample of 12.3 mL contains a mass of 96.80 grams. Also, you can know this value is correct because if you divide the mass by the value the density is the same (96.80 grams ÷ 12.3 mL = 7.87 g/mL)

Explanation:

thanks for the points big man

No, firstly bc stainless steel and carbon steel mixed with different things, high-density metals and carbon.

High-density metals and carbon both has different density which will affect the steel when they combined with iron. So it cant be the same.

Answer:

pure hydrogen is a pure substance even though it consists of many different types of molecules. what makes it pure substance is that it is free from contamination.

Answer:

Controlled fission chain reactions can be used to produce electricity in a nuclear-powered submarine.

4.Medical imaging devices use radioactive elements with short half-lives to see through the human body and diagnose patients

Explanation:

A submarine uses nuclear vision as a source of energy. The heat from controlled nuclear fission reactions produces steam which drives a steam turbine to power the submarine.

In the area of medicine, medical imaging is becoming a popular technique for diagnosis of many illnesses. These radioactive elements with short half lives are used to see through the human body for the purpose of diagnosis.

Answer:

"can be separated using physical means" is the answer

Answer:

See explanation

Explanation:

A force may be defined as a push or pull on an object as a result of its interaction with another object.

Thus, interaction between two objects is only possible because of the action of a force on each of the objects due to interaction between the objects.

For instance, the earth remains in its orbit due to the gravitational force of attraction between the earth and the sun. Many more examples of forces abound in science.

Answer: your body converts the food into energy and gets rid of the uneeded stuff

Explanation: A physical change is a change that doesn't create a new substance or change the substance. Usually this involves a size or shape change. ... A chemical change is a change that creates a new substance or changes the substance. Usually, this involves color change, temperature change, and/or a new substance being formed.

hope this helps

Answer:

Modern chemistry describes the composition, structure, and physical and chemical properties of substances. ... The main aim of modern chemistry is to improve the communication and conversation among the scientists, researchers, engineers, and policymakers, who are working under the area of modern chemistry

Explanation:

I hope this helps you!!