Abbreviation for mole

Answer:

16.6g

Explanation:

D. Scientific measurements that contain data points that are average approximations of specific measurements.

A proxy climate indicator is a local record that is interpreted using physical or biophysical principles to represent some combination of climate-related variations back in time.

These proxy data are preserved physical characteristics of the environment that can stand in for direct measurements. Paleoclimatologists gather proxy data from natural recorders of climate variability such as corals, pollen, ice cores, tree rings, caves, pack rat middens, ocean and lake sediments, and historical data.

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Answer:

A

Explanation:

I Took the test

A metal does not form ionic bond with other metals. All the group 2 elements are metals. They cannot form compounds with each other. Therefore, option A is correct.

Ionic bonds are formed between metals and non-metals. Metals are all electropositive and they easily loss electrons to form corresponding cations.

Non -metals are mostly electron deficient and will gain electrons from metals to achieve octet. Non-metals form their anions and they combine with the cations electrostatically form the ionic bond.

No two metals can form a compound together. They both form positive ions and repel each other. Therefore, beryllium cannot form compounds with elements of its own group which are all metals. Hence, option A is correct.

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Answer:

0.04821 mol CaCl₂

Explanation:

Ca(OH)₂  +  2 HCl  ⇒  CaCl₂  +  H₂O

This is your reaction.

We need the chemical equation to know the stoichiometry (the numbers that in front of the compounds).  Since we are converting from Ca(OH)₂ to CaCl₂, you only need to focus on these compounds.  There are no numbers in front of Ca(OH)₂ and CaCl₂, so the ratio of the compounds is 1:1.

Now, convert grams of Ca(OH)₂ to moles of Ca(OH)₂.  The molar mass is 74.09 g/mol.

[tex]3.572 g*\frac{mol}{74.09g} =0.04821 mol[/tex]

Using moles of Ca(OH)₂ and the ratio from the stoichiometry, convert moles of Ca(OH)₂ to moles of CaCl₂.  Since the ratio is 1:1, the moles will be equal.

[tex]0.04821mol*\frac{1mol}{1mol} =0.04821mol[/tex]

You will produce 0.04821 moles of CaCl₂.

0.04821 mol CaCl₂ will be produced from 3.572 g of [tex]Ca(OH)_2[/tex] reacting with HCl.

Reaction:-

 Ca(OH)₂  +  2 HCl  ⇒  CaCl₂  +  H₂O

The ratio of the compounds is 1:1 because we are converting from  Ca(OH)₂ to CaCl₂. There are no numbers in front of Ca(OH)₂  and CaCl₂ because we are converting from  Ca(OH)₂ to CaCl₂.

Now, convert grams of Ca(OH)₂ to moles of Ca(OH)₂.  The molar mass of Ca(OH)₂ is 74.09 g/mol.

[tex]Number\ of \ moles=\frac{Mass}{Molar\ mass}[/tex]

                             [tex]\frac{3.572\ g}{74.093\ g/mol} \\=0.0482\ mol[/tex]

Hence, the 0.0482 moles of CaCl₂ will be produced.

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Answer:

The law of conservation of energy states that the total energy is constant in any process. Energy may change in form or be transferred from one system to another, but the total remains the same.

Explanation:

Answer:

D

Explanation:

Lithium has one valence electron, so it has one to give away to have an outer shell of 8.

Sulfur has 6 valence electrons, so it needs 2 to get an outer shell of 8.

If we have two Li, that means sulfur will get 2 e- and Li will give away 2 e-, so the formula is Li₂S.

Answer:

I think the answer is A.

The heat absorbed should be option A. 3,280 J.

Since A 56.8g sample of aluminum is heated from 79.5°C to 143.7°C. The specific heat capacity of aluminum is 0.900 J/(g*K).

So based on this, the following formula should be applied

= Mass of substance * specific heat * change in temperature

= 56.8 * 0.900 J * (143.7 - 79.5)

= 56.8 * 0.900 J * 64.2

= 3,280 J

hence, the first option is correct.

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Answer:

The atomic number

Explanation:

Transmutation refers to the conversion of one chemical element into another. A transmutation usually involves a change in the structure of atomic nuclei and this may be induced by a nuclear reaction.

Transmutation was first achieved in 1919 by Lord Rutherford when he successfully changed a nitrogen nucleus to an oxygen-18 isotope, producing a proton in the process.

Since transmutation often involves changing one atom into another, the atomic number or mass number of the original element always changes (to form a new element) in the process.

Answer:

The answer is B. H2SO4/Na2SO4

Explanation:

Answer:

b

Explanation:

Answer:

C. Liquid

Explanation:

Gas has no definite shape but liquid takes form of whatever container it is placed in

Answer:

Equilibrium Constant = (3.60 × 10⁶²)

Explanation:

The change in Gibb's free energy for a galvanic cell is given as

Δ = -nFE°

where n = number of electrons transferred = 5 for this reaction

F = Faraday's constant = 96500 C

E° = cell potential = +0.74 V

But the change in Gibb's free energy for galvanic cell reaction is also given as

ΔG = -RT In K

R = molar gas constant = 8.314 J/mol.K

T = absolute temperature in Kelvin = 25 + 273.15 = 298.15 K

K = Equilibrium constant.

Equating these two expressions

-nFE° = - RT In K

RT In K = nFE°

In K = (nFE°) ÷ (RT)

In K = (5 × 96500 × 0.74) ÷ (8.314 × 298.15)

In K = 144.04

K = e^(144.04)

K = (3.60 × 10⁶²)

Hope this Helps!!!

The equilibrium constant for the galvanic cell has been [tex]\rm \bold{e^1^4^4^.^0^4}[/tex].

Gibb's free energy has been defined as the reversible work performed by the thermodynamic system.

The Gibbs free energy can be given as:

[tex]\Delta[/tex]G = -nF[tex]\rm E^\circ[/tex]

The [tex]\Delta[/tex]G for the galvanic cell can also be given as:

[tex]\Delta[/tex]G = -RT ln K

Thus, for the galvanic cell:

-nF[tex]\rm E^\circ[/tex] = -RT ln K

There has been the transfer of 5 moles of electrons, thus:

- 5 mol × 96500 C × 0.74 V = - 8.314 J/mol.K × 298.15 K × In Equilibrium constant (K)

357,050 = 2,478.8191 K

In K = 144.04

K = [tex]\rm e^1^4^4^.^0^4[/tex]

The equilibrium constant for the galvanic cell has been [tex]\rm e^1^4^4^.^0^4[/tex].

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Answer: beta plus decay

Explanation:

just did it on edge :)

Answer:

The answer is C) beta plus decay

Explanation:

I took the assignment, i hope it helps

Answer:

B Temperature is clear cause of carbon dioxide levels

Answer:

B Temperature is clear cause of carbon dioxide levels

Explanation:

Increases in greenhouse gases such as carbon dioxide (CO2) result in the atmosphere retaining more heat.

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Answer:

Chloroplasts

Explanation:

Chloroplasts contain disc-shaped structures called thylakoids, which contain the pigment chlorophyll. Chlorophyll absorbs certain portions of the visible spectrum and captures energy from sunlight.

Answer:

1 L

Explanation:

V1=P2V2/P1

Checking this, it is correct because P and V at constant T has an inverse relationship.

- Hope that helps! Please let me know if you need further explanation.

Answer: the rate of the forward reaction is equal to the rate of the reverse reaction

Explanation:

A chemical reaction reaches equilibrium when the rates of the forward and reverse reactions are equal, causing the reactant and product concentrations to remain constant, signifying a dynamic equilibrium. If disturbed, the system will adjust to restore equilibrium.

When a chemical reaction reaches equilibrium, it means that the rate of the forward reaction is equal to the rate of the reverse reaction. This state is referred to as a dynamic equilibrium because the reactions continue occurring but the concentrations of the reactants and products remain unchanged. The reaction quotient (Q) equates to the equilibrium constant (K) at this point, and the system's macroscopic properties stay constant. If the system at equilibrium is disturbed by changing conditions, such as a change in reactant concentration, the system will adjust itself to re-establish equilibrium according to Le Chatelier's principle.

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The correct answer is Hydrogen concentration = 7.94×10^-3 M

What is hydrogen concentration?

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Answer:

I think A sorry if its wrong

Explanation:

All plants and animals have mechanisms or ways to transport nutrients within the cell. The correct option is a.

Water is a nutrient that aids in the movement of substances through our bodies and the control of body temperature. The growth, development, and maintenance of the tissues and cells in our bodies depend on minerals like calcium and iron.

While the Phloem carries organic nutrients in plants, the Xylem carries water and minerals.

Animals' intestines absorb the water we drink, which is then transported throughout the body as bodily fluids like blood. These carry out a variety of tasks that keep us alive. They provide the cells with oxygen and nutrition and remove waste products, which are eventually expelled through urination.

Therefore, the correct option is a. transport nutrients within the cell

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Answer:

Rock to Magma

Explanation:

Lava to Rock is incorrect because its "Freezing" The Lava

Magma to Lava basically a name change. No type change.

Rock to Sediment is Erosion of the rock.

Rock to Magma Is the Rock being super-heated, melting it. Similar to Ice and water but more extreme.

Rocks and sediment change their form as they move through the rock cycle.Rock to magma  change involves melting. Therefore, option C is correct.

Any rock type can be altered to form a metamorphic rock by extreme pressure from burial, increasing temperature at depth, and a long period of time. If the newly formed metamorphic rock is allowed to continue heating, it will eventually melt and become molten (magma).

The rock is pulled down by movements in the earth's crust and becomes increasingly hot as it descends. It takes temperatures ranging from 600 to 1,300 degrees Celsius (1,100 to 2,400 degrees Fahrenheit) to melt a rock, transforming it into magma (molten rock).

Rock to magma is the Rock being overheated and melting? Ice and water are similar, but more extreme.

Thus, option C is correct.

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Answer:

237/93 np

Explanation:

sub to tkwick

Answer:

THE NEW PRESSURE OF THE HELIUM GAS AT 2.98 L VOLUME IS 124.8 kPa.

AT AN INCREASE ALTITUDE, THERE IS A LOWER PRESSURE ENVIRONMENT AND THE HELIUM GAS PRESSURE DECREASES AND HENCE AN INCREASE IN VOLUME.

Explanation:

The question above follows Boyle's law of the gas law as the temperature is kept constant.

Boyle's law states that the pressure of a fixed mass of gas is inversely proportional to the volume, provided the temperature remains constant.

Mathematically, P1 V1 = P2 V2

P1 = 150 kPa = 150 *10^3 Pa

V1 = 2.48 L

V2 = 2.98 L

P2 = ?

Rearranging the equation, we obtain;

P2 = P1 V1 / V2

P2 = 150 kPa * 2.48 / 2.98

P2 = 372 *10 ^3 / 2.98

P2 = 124.8 kPa.

The new pressure of the gas when at a height which increases the volume of the helium gas to 2.98 L is 124.8 kPa.

Answer: 11.2 L of [tex]CH_4(g)[/tex] at 273K and 202kPa

Explanation:

According to ideal gas equation:

[tex]PV=nRT[/tex]

P = pressure of gas = 202 kPa = 1.99 atm  ( 1kPa= 0.0098 atm)

V = Volume of gas = 11.2 L

n = number of moles = ?

R = gas constant =[tex]0.0821Latm/Kmol[/tex]

T =temperature =[tex]273K[/tex]

[tex]n=\frac{PV}{RT}[/tex]

[tex]n=\frac{1.99\times 11.2}{0.0821 L atm/K mol\times 273K}=0.99moles[/tex]

According to avogadro's law, equal number of moles occupy equal volumes and contain equal number of molecules at same temperature and pressure conditions.

As 11.2 L of [tex]CH_4(g)[/tex] at 273K and 202kPa will have same moles as 11.2L of He (g) at 273K and 202kPa, thus they have same number of molecules.

Using Avogadro's Law which states that equal volumes of gas at the same temperature and pressure have the same number of molecules, the gas that has the same number of molecules as 11.2L of He (g) at 273K and 202kPa would be 11.2L of CH4(g) at 273K and 202kPa.

The concept we need to understand to answer this question is the Avogadro's law, which states that equal volumes of all gases, at the same temperature and pressure, have the same number of molecules. Thus, regardless of the specific gas, 11.2L of any gas at 273K and 202kPa will have the same number of molecules.

Therefore, the sample that would have the same number of molecules as 11.2L of He (g) at 273K and 202kPa would be 11.2L of CH4(g) at 273K and 202kPa. The other two samples have different conditions and thus would not have the same number of molecules.

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Answer:

72g of H2O.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

2H2 + O2 —>2H2O

Next, we'll determine the mass of O2 that reacted and the mass of H2O produced from the balanced equation.

This is illustrated below:

Molar Mass of O2 = 16x2 = 32g/mol

Molar Mass of H2O = (2x1) + 16 = 18g/mol

Mass of H2O from the balanced equation = 2 x 18 = 36g

Summary:

From the balanced equation above,

32g of O2 reacted to produce 36g of H2O.

Now, we can obtain the mass of H2O produced when 64g of O2 react as follow:

From the balanced equation above,

32g of O2 reacted to produce 36g of H2O.

Therefore, 64g of O2 will react to produce = (64 x 36)/32 = 72g of H2O.

From the calculations made above, 72g of H2O is produced from the reaction.

Answer:

The volume would be 44.8 L

Explanation:

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Answer:

the correct answers is 100 22.7 and 24.6

Explanation:

did it on edgunity

The metal is initially heated to a temperature of 100°C. The water's original temperature is 22.4 °C. Both have a final temperature of 27.1°C.

The initial temperature, which is established following the movement or movement of the full and closed container, is indeed the average temperature of the lowest container to be taken into account at the start of the hot temperature cycle.

Initial temperature refers to the average interior temperature of the coldest processing container at the start of the thermal processing cycle, as assessed following a thorough stir or shake of the filled and sealed containers.

Thus, the metal is initially heated to a temperature of 100°C. The water's original temperature is 22.4 °C. Both have a final temperature of 27.1°C.

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Your question is incomplete, most probably the complete question is:

Measure the initial temperature of the water to the nearest 0.1c record in the date table.

Initial temperature of metal =

°C

Initial temperature of water =

Final temperature of both =

Answer:

A. A whole number that appears in front of a compound or element in a balanced chemical equation.  

Explanation:

That's the definition of a coefficient.

B, C, and D are wrong. Subscripts are not coefficients.

Answer:

34.91 atm

Explanation:

Step 1:

Data obtained from the question include:

Volume (V) = 50L

Number of mole (n) = 45 moles

Temperature (T) = 200°C

Pressure (P) =?

Note: Gas constant (R) = 0.082atm.L/Kmol

Step 2:

Conversion of celsius temperature to Kelvin temperature.

T (K) = T (°C) + 273

T (°C) = 200°C

T (K) = 200°C + 273

T (K) = 473K

Step 3:

Determination of the pressure.

The pressure inside the container can be obtained by using the ideal gas equation as follow:

PV = nRT

Divide both side V

P= nRT / V

P = (45 x 0.082 x 473) / 50

P = 34.91 atm

Therefore, the pressure inside the container is 34.91 atm

The pressure inside a 50 liter container that holds 45 moles of gas at a temperature of 200 degrees is 34.90 atm.

Ideal gas equation is a hypothesis which shows the behavior of gas at different conditions and it will be represented as:

PV = nRT, where

P = pressure of gas = to find?

V = volume of the container = 50 L

n = moles of gas = 45 moles

R = universal gas constant = 0.082atm.L/Kmol

T = temperature = 473 K

On putting all these values on the above equation, we get

P = (45)(0.082)(473) / (50)

P = 34.90 atm

Hence required pressure is 34.90 atm.

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Answer:

The plane flew for a total of 3, 614 miles.

Explanation:

Speed, V = [tex]\frac{distance}{time}[/tex]

Since units is given in miles per hour (mph), there isn't any need to convert to standard units.

Solving for distance = speed × time

∴ Total distance travelled

= (2 × 467) + (5 × 536)

=3, 614 miles.

Answer:

The plane flew 3614 miles

Explanation:

Answer:

6x-1 feet

Explanation:

perimeter = ( 4x-1 ) + 2x

= 6x-1 feet

Answer:

3.066g

Explanation:

Step 1:

The balanced equation for the reaction. This is given below:

2Li + H2S —> Li2S + H2

Step 2:

Data obtained from the question.

Volume (V) of H2 = 4.5L

Temperature (T) = 315K

Pressure (P) = 1.258 atm

Note:

Gas constant (R) = 0.0821atm.L/Kmol

Number of mole (n) of H2 =..?

Step 3:

Determination of the number of mole of H2 produced.

This can be obtained by using the ideal gas equation as follow

PV = nRT

Divide both side by RT

n = PV /RT

n = 1.258 x 4.5 / 0.0821 x 315

n = 0.219 mole

Therefore, 0.219 mole of H2 is produced.

Step 4:

Determination of the number of mole of Li that will produce 0.219 mole of H2.

This is shown below:

2Li + H2S —> Li2S + H2

From the balanced equation above,

2 moles of Li reacted to produce 1 mole of H2.

Therefore, Xmol of Li will react to produce 0.219 mole of H2 i.e

Xmol of Li = 2 x 0.219

Xmol of Li = 0.438 mole

Step 5:

Conversion of 0.438 mole of Li to grams.

Number of mole of Li = 0.438 mole

Molar Mass of Li = 7g/mol

Mass = number of mole x molar Mass

Mass of Li = 0.438 x 7

Mass of Li = 3.066g

Therefore, 3.066g if Li is needed for the reaction.