An educated guess which explains observations is called:  

a a law  
b an experiment
 c a hypothesis  
d a variable​

Answer:

'An ion has a non-zero electric charge. A radical has an atom with unfilled electron shells and so is very reactive, but is electrically neutral.'

'Atoms are single neutral particles. Molecules are neutral particles made of two or more atoms bonded together.'

'The primary difference that lies between these organic compounds and inorganic compounds is that organic compounds always have a carbon atom while most of the inorganic compounds do not contain the carbon atom in them.'

Organic and inorganic compounds:

Similarities:::---

1) In both organic and inorganic compound, the elements joining in making compound complete their octet.

2) Organic compound shows isomerism (R/S , E/Z , cis/trans, enantiomers, diastereomers, etc), just as inorganic compound do (Δ/Λ, enantiomers, R/S enantiomers, cis/trans, fac/mer isomers, etc).

3) Organic compound and inorganic compounds can be very active in chemical reactions, e.g. organolithium reagents could be flammable or even pyrophoric (generally stored under 10°C), while inorganic reagents like in this paper are quite rapid...

Differences:::---

1) Organic compound are very long in size so they can make polymer but inorganic compound are not very long but its structure might me complex.

2) The boiling,melting point of organic compound is lass than inorganic compound.

3) Organic compound always contains carbon but inorganic compounds might not.

4) Organic compound

_____________________________

Ion and Radical Atoms:

In some sense they are a bit similar. The main difference is that a neutral radical has no charge imbalance between the protons and electrons, but the cation or anion does.

Ions are written with an explicit charge because of that charge imbalance, but radicals may or may not have an imbalance of charge. Just because a molecule is a radical doesn't mean it's neutral.

For example, if you shoot 2-pentanone with an electron beam for Electron "Impact" Mass Spectroscopy, where you essentially study molecules whose structures break into smaller pieces as a result of interacting with stray electrons to identify the molecules, you get a cationic radical (middle, or far right of the following diagram).

Answer:

1.3 x 10²⁴ atoms Fe

Explanation:

To convert moles to atoms, you need to multiply your given value by Avogadro's Number. This causes the conversion to occur because Avogadro's Number exists as a ratio. It is the ratio that allows for the cancellation of units during multiplication. This is why atoms should be in the numerator of your conversion. The final answer should have 2 sig figs to reflect the given value.

Avogadro's Number:

1 mole = 6.022 x 10²³ atoms

2.1 moles Fe          6.022 x 10²³ atoms
---------------------  x  -------------------------------  =  1.3 x 10²⁴ atoms Fe
                                        1 mole

From the calculations, the percentage of the mineral left is 6.25%.

The term half life refers to the time that it takes for only half of the number of radioactive isotopes to remain.

From;

N/No = (0.5)^t/t1/2

N = ?

No = ??

t = 2000

t1/2 = 500

N/No =(0.5)^(2000/500)

N/No = 0.0625

Thus the percent left = 0.0625 * 100 = 6.25%

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The approximate distance from the far edge of one lobe to the far edge of the other is 2,100,000 light-years.

This distance measures the outer space between the edges of the two lobes in a given time.

The approximate distance from the far edge of one lobe to the far edge of the other in a solar system is about 2,100,000 light-years.

Thus, the approximate distance from the far edge of one lobe to the far edge of the other is 2,100,000 light-years.

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Red algae and euglena evolved from a symbiotic relationship of organisms, which resulted in eukaryotic organisms containing chloroplasts

Theory of endosymbiosis:

Early eukaryotes developed by the symbiotic connection of prokaryotes, in accordance with the endosymbiosis idea. Which two protists underwent symbiotic evolution, leading to the development of eukaryotic creatures with chloroplasts.

-Symbiotic relationships between two or more prokaryotic cells led to the evolution of the first eukaryotic cells. Greater prokaryotic cells invaded or devoured smaller prokaryotic cells. The connection provided a secure home and nourishment for the tiny cells. By absorbing part of the organic molecules or energy generated by the endosymbionts, the bigger cells (now referred to as hosts) profited.

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The work function of the metal is obtained as 5.1 eV

The cutoff frequency is the frequency below which photo electric effect can not occur as electrons are not removed from the metal surface.

Now;

fo = 1.22 x 10^15 Hz

Wo = hfo

Wo = 6.6 * 10^-34 * 1.22 x 10^15

Wo = 8.1 * 10^-19 J

If 1 eV = 1.60 x 10-19 J

x eV = 8.1 * 10^-19 J

x = 8.1 * 10^-19/ 1.60 x 10-19

x = 5.1 eV

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The number of moles of H₂O is  0.36 mol.

The number of moles of LiClO₄ is  0.0521  mol.

Mole is an important standard unit used for the measurement of large quantities of atoms, molecules, or other particles. One mole is equal to 6.022×10²³ units.

The number of moles of a substance is calculated by:

Moles =[tex]\frac{mass}{molar \;mass}[/tex]

To find the number of moles of H₂O:

Mass of H₂O in the sample = 6.579 g

The molecular weight of H₂O = 18.02g

Moles = [tex]\frac{mass}{molar \;mass}[/tex]

Moles = [tex]\frac{6.579 g}{18.02g}[/tex]

Moles = 0.36

To find the number of moles of [tex]ZnSO_4[/tex]:

Mass of [tex]ZnSO_4[/tex] in the sample = 8.421 g

The molecular weight of [tex]ZnSO_4[/tex]= 161.47 g/mol

Moles =[tex]\frac{mass}{molar \;mass}[/tex]

Moles = [tex]\frac{8.421 g}{161.47 g/mol}[/tex]

Moles = 0.0521 moles

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Answer:

sharks have cartilaginous skeletons

Explanation:

Sharks are an example

52.66 grams of acetylene are in the tank.

PV=nRT is the formula for ideal gases, where P is the pressure and R is the constant and T is the temperature (P is 1.39 atm in this case)

Volume = 35.0 L

Gas constant = 0.08206 L.atm/K.mole

Temperature = 20.0 °C  = 293 °C

We also know that we can apply the formula ;

Number of mole(n) = [tex]\frac{MmPV}{RT}[/tex]

m = ( 26.04 × 1.39 × 35 )/ (0.08206 × 293.15)

m = 52.66 g

Thus, the mass is 52.66 grams.

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Answer:

It is in the same phase as the reactants.

Explanation:

i took the test

The granite block transferred 4,080 joules of energy, and the mass of the water is 35.8 grams.

Heat transfer in any system can be calculated as follow:

q = mCΔT

Given ;

Putting all the values in folowing equation,

q = mCΔT

we get

q = 126.1 × 0.795 × -40.7 = -4080 J

Now by using same formula, we can also calculate the mass of water in the following way:

m = q / CΔT

where

Putting all these values ;

m = -4080 /  4.186 × 27.2 = 35.8 g.

Hence, 4,080 joules of energy is transferred by granite block and 35.8 g is the mass of water.

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Answer:

Moles Lost = 0.0335 moles

Explanation:

This type of question requires the Ideal Gas Law equation. The equation looks like this:

PV = nRT

In this formula,

-----> P = pressure (kPa)

-----> V = volume (L)

-----> n = number of moles

-----> R = constant (8.314 L*kPa/mol*K)

-----> T = temperature (K)

(Step 1)

To find how many moles were lost, you first need to find how many moles you had to begin with. This can be done by plugging the starting values into the equation and solving for "n". But first, you need to convert Celsius to Kelvin (by adding 273.15).

P = 225 kPa                  R = 8.314 L*kPa/mol*K

V = 2.75 L                     T = 25°C + 273.15 = 298.15 K

n = ?

PV = nRT

(225 kPa)(2.75 L) = n(8.314 L*kPa/mol*K)(298.15 K)

618.75 = n(2478.8191)

0.250 = n

(Step 2)

Next, you need to find the number of moles in the container after it has been re-sealed. The volume is the same because the container did not change. The process should be the same as above.

P = 185 kPa                   R = 8.314 L*kPa/mol*K

V = 2.75 L                     T = 10°C + 273.15 = 283.15 K

n = ?

PV = nRT

(185 kPa)(2.75 L) = n(8.314 L*kPa/mol*K)(283.15 K)

508.75 = n(2354.1091)

0.216 = n

(Step 3)

Finally, you can find the number of moles lost by subtracting the final amount of moles from the original amount. When doing this calculation, I used the value of the moles saved in my calculator (with more decimal places) to get a more accurate number.

Moles Lost = Initial Moles - Final Moles

Moles Lost = 0.250 moles - 0.216 moles

Moles Lost = 0.0335 moles

Answer:

the asymmetrical arrangement of hydrogen atoms in a molecule of water causes the molecule to be polar, with the hydrogen atoms having a slightly positive charge, and the oxygen atom having a slightly negative charge.

Answer:

See below

Explanation:

Simply :    2.357 g / 75 ml = .03142  gm/ml   or  31.42  gm / liter

Answer: 324 g (to 3 sf)

Explanation:

Based on the coefficients of the equation, we know that when 3.00 mol of water is consumed, 3.00 mol of carbon dioxide is also consumed.

Thus, the formula mass of carbon dioxide is:

[tex]6(15.9994)+12.011=108.0074[/tex] g/mol.

Thus, 3.00 mol has a mass of (108.0074)(3.00)=324 g (to 3 sf)

The AP Biology teacher is measuring out 638.0 g of dextrose (C6H12O6) for a lab the moles of dextrose is this equivalent to is 3.6888 moles.

A mole is described as 6.02214076 × 1023 of a few chemical unit, be it atoms, molecules, ions, or others. The mole is a handy unit to apply due to the tremendous variety of atoms, molecules, or others in any substance.

To calculate molar equivalents for every reagent, divide the moles of that reagent through the moles of the restricting reagent. The calculation is follows:

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did anyone able to look up this question

the ratio for the H is 3.9901

MM Zn(NO₃)₂ = 189.36 g/mol

mass 1 mol Zn(NO₃)₂ = 189.36 g

mass hydrate = 100 / 63.67 x 189.36 = 297.409 g

mass 1 mol hydrate = 297.409 g

MM hydrate = 297.409 g/mol

MM hydrate = MM Zn(NO₃)₂ + MM xH₂O

297.409 = 189.36 + x(18)

x = 6

Answer:

i think the answer is Continental polar air masses

Explanation:

Answer:

185 gms o NaBr

Explanation:

Na Br  mole weight = 22.989 +79.904 = 102.893  gm/mole

1.083 x 10^24  molecules / 6.022 x 10^23 molecules / mole = 1.798 moles

102.893  *  1.798 = 185 gms

Answer: when a reaction absorbs heat or decreases the entropy of the system,

Explanation: :)

Answer: bromine

Explanation:

There are a total of 2+2+6+2+6+2+10+5=35 electrons, meaning there are 35 protons. The element with atomic number 35 is bromine

Answer:

a.  P=188mmHg

Explanation:

A gas undergoing a change of volume and pressure at constant temperature (and not changing the number of molecules), follows Boyle's Law:  [tex]P_1V_1=P_2V_2[/tex]

The units of these quantities can be any measure of pressure and volume, so long as long as the units are the same between beginning and ending conditions.

Substitute and solve:

[tex]P_1V_1=P_2V_2[/tex]

[tex](685[mmHg])(131[mL])=P_2(478[mL])[/tex]

[tex]\dfrac{(685[mmHg])(131[mL\!\!\!\!\!\!\!\!\!{--}])}{478[mL\!\!\!\!\!\!\!\!\!{--}]}=\dfrac{P_2(478[mL]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----})}{478[mL] \!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----}}[/tex]

[tex]187.730125523[mmHg]=P_2[/tex]

Accounting for significant figures, [tex]P_2=188[mmHg][/tex]

Answer:

An exergonic reaction releases free energy, and an endergonic reaction absorbs free energy.

Explanation:

hope it helps

The activity series of metals as well as the electrode potential of metals can be used to compare the reactivity of metals.

The reactivity of metals can be compared using their electrode potentials which is a measures of the ability of the metal to donate electrons to another metal.

When comparing the reactivity of metals, the metal with the lesser negative electrode potential will be more reactive than another with a greater negative or positive electrode potential.

Therefore, the activity series of metals as well as the electrode potential of metals can be used to compare the reactivity of metals.

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Hydrometeorological hazards are caused by extreme meteorological and climate events, similar as cataracts, famines, hurricanes, tornadoes, or landslides.

Therefore these are the hydro-meteorological hazards.

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