Anyone know the answer to this? Explain if you do, im not sure if i understand what its asking.

Answer:

100

Explanation:

answer is to simple why it is 100.0 when you write the number down on your calculator it give you 100 because the last zero does not count

Answer:

Once in the atmosphere, CFCs drift slowly upward to the stratosphere, where they are broken up. So true.

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Answer:A

Explanation:

Answer:

Type of breath mint

Explanation:

The independent variable, in this case, would be the type of breath mint given to each study group.

An independent variable refers to a variable whose variation does not depend on another variable or factor. In research, the independent variable stands alone and the researcher can control or manipulate it in order to measure its effect on some other variables.

In the case of Mr. Krabs, the two types of breath mints administered to the two study groups represent the independent variable. Any differences in the experience of the two study groups can be attributed to the difference in the breath mint taken.

Answer:

This question is incomplete

Explanation:

This question is incomplete.

However, when all the required data are available, you can use the formula/steps below

Average speed/velocity (m/s) = distance (in metres) ÷ time (in seconds)

Time (in secs) = distance ÷ average speed/velocity

Kindly note that "blocks" is not a standard unit for distance measurement in science, hence the distance (since its a walking distance) must be in metres (or converted to metres if not in metres).

The distance in the formula is the distance from the hotel to the ice cream shop while the average speed is the distance covered per time as s/he walks to the ice cream shop and back. Hence, the answer gotten from the formula above will have to be multiplied by 2 (in order to get the time taken to walk to the ice cream shop and back) because the formula will only provide answer to one trip (time taken to walk to the shop).

After the multiplication mentioned above, the time in seconds should be converted to minutes by dividing the answer in seconds by 60

Answer:

Option B is correct.

Explanation:

Since an iron nail is solid and have very large force of attraction between the particles therefore the particles can't move freely and could only vibrate at it's place.

Answer:

Option B is correct.

Explanation:

Since an iron nail is solid and have very large force of attraction between the particles therefore the particles can't move freely and could only vibrate at it's place.

Metric relationships 103 ml = 1l, 1g = 102 centigrams and 1g = 103 kilograms are incorrect.

Metrics are a system which is based on decimal values and is used to measure the given quantity. It can be used to measure the length, volume, mass, time, speed, distance etc.

A metric quantity of mass that is equivalent to one thousand grams A mass of one kilogram weighs a little over two pounds.

Hence, option C, D and E are the incorrect options.

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Answer: The universe consists of all the energy made by the Sun and stars. The universe consists of all physical objects on Earth and in space. The universe consists of all matter and energy. The universe consists of solar systems which contain galaxies.

Explanation:  That's because the Universe does consists of all the energy made by the Sun and Stars. That is how we get our energy is from the Sun and Stars, and the Solar System contains Galaxies.

Answer: Science and Mathematics- Anthropologist, Meteorologist

Engineering and technology- Fuel Cell Technician, Computer programmer, electrical Drafter, Civil Drafter

Answer:

i have the same question  

Explanation:math and science is the meteorologs and the  anthropologist

Answer:

Explanation:

Density of a substance is given by

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

From the question

Density = 4.0 g/cm³

mass = 24g

Substitute the values into the above formula and solve for the volume

That's

[tex]4 = \frac{24}{v} \\4v = 24[/tex]

Divide both sides by 4

v = 6

We have the final answer as

Hope this helps you

Answer:

Explanation:

given volume =5.3 litres

as we know that 1 litre =1 dm3

therefore 5.3 litres =5.3 dm3

now moles =given mass /molar mass

so mass =moles*molar mass

in order to find mass of carbon we need to find moles

therefore moles=given volume/standard volume  standard volume at STP is 22.4 dm3

moles= 5.3/22.4

moles=0.236=0.24

now mass of carbon dioxide =moles*molar mass

mass = 0.24*44

mass=10.56kg

Answer:

International System of Units

Definition: A system of physical units ( SI units ) based on the metre, kilogram, second, ampere, kelvin, candela, and mole, together with a set of prefixes to indicate multiplication or division by a power of ten.

Hope this helps!

Answer:

Crushing or grinding increases the surface area of the salt that is exposed to the molecules of water. Stirring increases the speed at which the particles of salt come in contact with the water molecules.

Answer:

The new volume of the sample is halved.

Explanation:

Data obtained from the question include the following:

Initial volume (V1) = V

Initial temperature (T1) = T

Initial pressure (P1) = P

Final pressure (P2) = quadrupled = 4P

Final temperature (T2) = doubled = 2T

Final volume (V2) =?

Thus, we can obtain the new volume of the same by using the combined gas equation as shown below:

P1V1 /T1 = P2V2 /T2

P × V/T = 4P × V2/2T

Cross multiply

T × 4P × V2 = P × V × 2T

Divide both side by T × 4P

V2 = (P × V × 2T) / (T × 4P)

V2 = V/2

V2 = ½V

Therefore, the new volume of the sample is halved .

Mixtures can always be separated again into component pure substances, because bonding among the atoms of the constituent substances does not occur in a mixture. Whereas a compound may have very different properties from the elements that compose it, in mixtures the substances keep their individual properties.

Explanation:

Answer:

ΔH° = + 6.2 kJ

Explanation:

Fe₂O₃(s) + 3CO(g) –––––> 2 Fe(s) + 3 CO₂(g);        ΔH° = –26.8 kJ  ......... ( 1 )

  FeO(s) + CO(g) –––––> Fe(s) + CO₂(g);                  ΔH° = –16.5 kJ  .........( 2 )

   Multiplying equation ( 2 ) by 2 and subtracting it from ( 1 )

  Fe₂O₃(s) + 3CO(g) -2 FeO(s) -  2CO(g) ––> 2 Fe(s) + 3 CO₂(g) - 2Fe(s) -           2CO₂(g)              ΔH° = –26.8 kJ  -  ( 2 x –16.5 kJ )

Fe₂O₃(s) + CO(g) -2 FeO(s)––>  CO₂(g)              ΔH° = –26.8 kJ + 33 kJ

Fe₂O₃(s) + CO(g) ––>2 FeO(s) +CO₂(g)               ΔH° = + 6.2 kJ

Required   ΔH° = + 6.2 kJ       Ans .

Answer:

A

Explanation:

Answer:

No, air is not a good conductor of electricity.

It is poor conductor.

Answer:

Negatively charged ion.

Explanation:

Example:

Oxygen is an element containing negatively charged ions. Its valence number is minus 2.

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Answer:

[tex]a=64.7mg[/tex]

Explanation:

Hello,

In this case, we need to remember that for the required time for a radioactive nuclide as radium-226 to decrease to one half its initial amount we are talking about its half-life. Furthermore, the amount of remaining radioactive material as a function of the half-lives is computed as follows:

[tex]a=a_0(\frac{1}{2} )^{\frac{t}{t_{1/2}} }[/tex]

Therefore, for an initial amount of 100 mg with a half-life of 1590 years, after 1000 years, we have:

[tex]a=100mg(\frac{1}{2} )^{\frac{1000years}{1590years} }\\\\a=64.7mg[/tex]

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Answer:

Explanation:

ATP is used for immediate energy and short-term storage, while starch molecules are stable and can be stored for a long time

ATP is used for immediate energy and long-term storage, while starch molecules are unstable and can be stored for a short amount of time.

Answer:

The mass percentage of iron in [tex]\rm K_3[Fe(CN)_6][/tex]  (potassium ferricyanide) is approximately [tex]17\%[/tex].

Explanation:

Start by finding the formula mass of potassium ferricyanide, [tex]\rm K_3[Fe(CN)_6][/tex], using relative atomic mass data from the question:

[tex]\begin{aligned} & M(\mathrm{K_3[Fe(CN)_6]}) \\ &\approx 3 \times 39 + 56 + 6 \times (12 + 14) \\ &= \rm 329 \; g \cdot mol^{-1}\end{aligned}[/tex].

In other words, every one mole of [tex]\rm K_3[Fe(CN)_6][/tex] formula units have a mass of approximately [tex]329\; \rm g[/tex].

On the other hand, note that there is one iron [tex]\rm Fe[/tex] atom in every one mole of [tex]\rm K_3[Fe(CN)_6][/tex] formula units. Hence, there would be exactly one mole of iron atoms in every one mole of [tex]\rm K_3[Fe(CN)_6][/tex] formula units. The mass of that one mole of iron atoms is approximately [tex]56\; \rm g[/tex] (again, from the relative atomic mass data of the question.)

Therefore:

[tex]\begin{aligned}& \text{Mass percentage of $\mathrm{Fe}$ in $\mathrm{K_3[Fe(CN)_6]}$} \\ &= \frac{\text{Mass of $\mathrm{Fe}$ in one mole of $\mathrm{K_3[Fe(CN)_6]}$ formula units}}{\text{Mass of one mole of $\mathrm{K_3[Fe(CN)_6]}$ formula units}}\times 100\% \\ &= \frac{M(\mathrm{Fe}) \times (\text{Number of $\mathrm{Fe}$ atoms in each $\mathrm{K_3[Fe(CN)_6]}$ formula unit)}}{M(\mathrm{K_3[Fe(CN)_6]})} \times 100\%\end{aligned}[/tex]

[tex]\begin{aligned}&\approx \frac{1 \times 56\; \rm g \cdot mol^{-1}}{329\; \rm g \cdot mol^{-1}}\end{aligned}[/tex].

Answer:

A bond in which valence electrons are shared is called COVALENT.

HYDROLYSIS is the process of breaking large molecules into smaller ones by adding water.

If energy is released when a molecule is broken apart, it is an EXERGONIC REACTION.

The process of building up large molecules from small components is an ANABOLIC process.

A lipid with four sites lacking hydrogen saturation is a POLYUNSATURATED lipid.

Answer:

The answers to your questions are given below

Explanation:

1. 3 Na2SO4

Molecules of Na2SO4 = 3

Na (sodium) = 3 x 2 = 6

S (sulphur) = 3 x 1 = 3

O (oxygen) = 3 x 4 = 12

2. 4 Pb(NO3)2

Molecules of Pb(NO3)2 = 2

Pb (lead) = 4 x 1 = 4

N (nitrogen) = 4 x 2 x 1 = 8

O (oxygen) = 4 x 3 x 2 = 24

Answer:

3 significant numbers

Correct Answer: 0.01g

The scales and balances have various divisions and units that define the accuracy of the measurement system. The smallest division on the balance scale is 0.001 gm. This, option D is correct.

Scales have been defined as the measurement system that estimates the quantity of the various substances in various units including, centimeters, meters, kilograms, grams, milligrams, liter, milliliters, etc. These units are interconvertible.

1 gram is the while part of the gram unit, 0.1 shows one-tenth part of the gram, 0.01 shows the one-hundredth part of the gram, and 0.001 shows the thousandth part of the gram. one gram is the largest number on the scale and 0.001 gm is the smallest number on the balance.

Therefore, option D. 0.001 gm is the smallest number.

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Answer:

Explanation:

relation between energy wavelength and frequency.....

we know that energy of photon is

E=hf  but

v=fλ

f=v/λ when v=c(speed of light) then f=c/λ

putting the value of f in the equation of photon

E=hc/λ this equation gave a relation between wavelength frequency and energy in electromagnetic  waves

among electromagnetic waves UV rays are most dangerous because exposure to these radiation cause serious problems in living organism

Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. The relation that we use in case of electromagnetic wave is E=hc/λ

Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave

There is a relation between energy of wave. frequency of wave, and wavelength of wave

Mathematically,

E=hc/λ

where,

E = energy of electromagnetic wave

h is planks constant having value 6.67×10⁻³⁴js

c is speed of light that is 3×10⁸m/s

λ  is the wavelength of electromagnetic wave

Thus the relation that we use to find the energy of electromangetic wave is E=hc/λ

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Answer:

There is no limitation at all because that is the basic theory of solution electrolysis

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Limitation of Bronsted Lowey concept:

✭It doesn't describe the acidic and basic nature of organic compound.

✭It also doesn't describe the acidic, basic as well as amphoteric gaseous molecule.

✭According to Bronsted Lowery concept same compound in one reaction act as acid and another reaction act as base so, it is difficult to predict the exact acid or base.