What is the main idea and Detail/Evidence of Light microscopes​

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:

D.1 proton and 1 neutron is the correct answer    

Explanation:

Final answer:

A number placed in front of a compound or an element in a chemical equation, such as 13 in front of oxygen, is a coefficient that indicates the number of molecules present, meaning there are 13 oxygen molecules in the reactants.

Explanation:

When you see a number placed in front of a compound or an element in a chemical equation, such as the number 13 placed in front of oxygen, this number is referred to as a coefficient. Coefficients are used in chemical equations to indicate the number of molecules or atoms involved in the reaction. Unlike subscripts, which denote the number of atoms of an element within a molecule, coefficients tell us how many units of a molecule or an elemental atom are present. Therefore, if we see a 13 in front of oxygen in a chemical equation, it indicates the presence of 13 oxygen molecules. This means that the correct answer is "C) It is a coefficient representing that there are 13 oxygen molecules in the reactants".

Answer:

A. How well a current will flow in a material and it's measured in volts.

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:

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:

237/93 np

Explanation:

sub to tkwick

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:

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:

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: 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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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:

16.6g

Explanation:

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:

The answer is B. H2SO4/Na2SO4

Explanation:

Answer:

b

Explanation:

When the same force is applied to two objects with different masses, the object with the smaller mass will experience a greater acceleration.

This is in accordance with Newton's second law of motion, which states that acceleration is inversely proportional to mass when force is constant.

Less massive objects accelerate more easily in response to a given force, while more massive objects require a greater force to achieve the same acceleration.

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The object with the smaller mass will have the greater acceleration.

According to Newton's second law of motion, the acceleration of an object is directly proportional to the net force applied to it and inversely proportional to its  mass. This relationship is given by the equation:

[tex]\[ a = \frac{F}{m} \][/tex]

where [tex]a[/tex] is the acceleration, [tex]F[/tex] is the force applied, and [tex]m[/tex] is the mass of the object.

 Given that the same force [tex]F[/tex] is applied to two different objects, the acceleration [tex]\( a \)[/tex] of each object will depend on its mass [tex]\( m \).[/tex] If we denote the force as \( F \), and the masses of the two objects as [tex]\( m_1 \) and \( m_2 \),[/tex] with [tex]\( m_1 < m_2 \)[/tex], the accelerations [tex]\( a_1 \) and \( a_2 \)[/tex] can be calculated as:

[tex]\[ a_1 = \frac{F}{m_1} \][/tex]

[tex]\[ a_2 = \frac{F}{m_2} \][/tex]

Since [tex]\( m_1 < m_2 \)[/tex], the fraction [tex]\( \frac{F}{m_1} \)[/tex] will be greater than [tex]\( \frac{F}{m_2} \),[/tex]which means that \[tex]( a_1 > a_2 \).[/tex]

Therefore, the object with the smaller mass [tex]\( m_1 \)[/tex] will have the greater acceleration [tex]\( a_1 \)[/tex] when the same force [tex]\( F \)[/tex] is applied to both objects.

This conclusion is consistent with the inverse relationship between mass and acceleration as described by Newton's second law.

Answer: The new volume is 2.4 L

Explanation:

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]

where,

[tex]P_1[/tex] = initial pressure of gas = 150 kPa

[tex]P_2[/tex] = final pressure of gas =  101 kPa (at STP)

[tex]V_1[/tex] = initial volume of gas = 1.5 L

[tex]V_2[/tex] = final volume of gas = ?

[tex]T_1[/tex] = initial temperature of gas = 250 K

[tex]T_2[/tex] = final temperature of gas = 273 K ( at STP)

Now put all the given values in the above equation, we get:

[tex]\frac{150\times 1.5}{250}=\frac{101\times V_2}{273}[/tex]

[tex]V_2=2.4L[/tex]

Thus the new volume is 2.4 L

To find the new volume at STP, the combined gas law is used. The initial conditions (150kPa, 1.5L, and 250K) are set equal to the final conditions at STP (101.3kPa, V2, and 273K), then solved for V2 to get the new volume in liters which is 2.42L.

To determine the new volume of the gas at standard temperature and pressure (STP), we can use the combined gas law which states that the ratio of the product of pressure and volume and the absolute temperature of a gas is constant, provided the amount of gas remains constant. For the 1.5L sample of a gas at 150kPa and 250K when changed to STP, we assume the STP conditions to be 0°C (or 273K) and 101.3kPa.

First, we convert the initial pressure to kPa if it is not already, and we confirm that the initial temperature is in Kelvin. Then we can plug our known values into the formula:

P1 * V1 / T1 = P2 * V2 / T2

Where P1 and V1 are the initial pressure and volume, T1 is the initial temperature, P2 and V2 are the final pressure and volume, and T2 is the final temperature at STP.

In this case, we have:

150kPa * 1.5L / 250K = 101.3kPa * V2 / 273K

When we solve for V2, we get:

V2 = (150kPa * 1.5L / 250K) * 273K / 101.3kPa

V2= 2.42L

Performing the calculation we get the new volume of the gas at STP which is 2.42L.

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:

C. Liquid

Explanation:

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

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

What is hydrogen concentration?

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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 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:

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 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: 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:

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.

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:

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:

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:

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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