Calculate the molarity of 0.50 mol MgCl2 in 750 ml of solution.

a) 0.38 M

b) 0.67 M

c) 0.75 M

d) 0.95 M

Answer:magnets, iron, cobalt, nickel, steel (because it is mostly iron), manganese, gadolinium and lodestone.

Explanation:

Hope I helped

Answer:

Atmosphere.

Explanation:

Carbon moves from fossil fuels to the atmosphere when fuels are burned. When humans burn fossil fuels to power factories, power plants, cars and trucks, most of the carbon quickly enters the atmosphere as carbon dioxide gas.

Answer:

CH2O

Explanation:

Pretend you have a 100 gram sample.

39.99 g C * (1 mol/12.01 g) = 3.33 moles C

53.28 g O * (1 mol/16 g) = 3.33 moles O

6.73 g H * (1 mol/ 1.008 g) = 6.676 moles H

You can see from this data that there are double the number of moles of H compared to the moles of C and O.

To find the empirical formula, you divide all the moles by the least number of moles. In this case, the least number of moles is 3.33. So for carbon and oxygen, divide 3.33 by 3.33... this equals 1. For H, divide 6.676 by 3.33... this is about equal to 2. Therefore, the empirical formula is CH2O. :)

Hope this was helpful!

Answer: [tex]COH_2[/tex]

Explanation:

39.99% C

53.28% O

6.73% H

First step:

Change % to g

39.99g C

53.28g O

6.73g H

Second step:

Calculate the number of g/mol using atomic mass.

[tex]39.99gC(\frac{1mol}{12g} )=3.332mol[/tex]

[tex]53.28gO(\frac{1mol}{16g})=3.330mol[/tex]

[tex]6.73gH(\frac{1mol}{1g} )=6.73mol[/tex]

Third step:

Determine the smallest number of moles and divide each compound by it. When you get the result, simply put the whole number, not decimals.

[tex]C=\frac{3.332mol}{3.330mol}=1[/tex]

[tex]O=\frac{3.330mol}{3.330mol} =1[/tex]

[tex]H=\frac{6.73mol}{3.330mol}=2[/tex]

Fourth step:

Rewrite those number under the compounds.

This empirical formula should be: [tex]COH_2[/tex]

Answer:

16.48mL

Explanation:

The following data were obtained from the question:

Initial pressure (P1) = 1 atm

Initial temperature (T1) = 0°C = 0°C + 273 = 273K

Initial volume (V1) = 30mL

Final temperature (T2) = 27°C = 27°C + 273 = 300K

Final pressure (P2) = 2atm

Final volume (V2) =..?

Applying the general gas equation, the final volume of the gas can be obtained as follow:

P1V1/T1 = P2V2/T2

1 x 30/273 = 2 x V2/300

Cross multiply to express in linear form

273 x 2 x V2 = 30 x 300

Divide both side by 273 x 2

V2 = (30 x 300)/(273 x 2)

V2 = 16.48mL

Therefore, the new volume of the gas is 16.48mL

The volume of a sample of gas that starts at 1.00 atm, 0.00 degrees celsius, and 30.0 mL is 16.48mL. Details about volume can be found below..

The volume of an ideal gas can be calculated by using the following formula:

P1V1/T1 = P2V2/T2

Where;

1 × 30/273 = 2 × V2/300

0.109 = 2V2/300

32.97 = 2V2

V2 = 16.48mL

Therefore, the volume of a sample of gas that starts at 1.00 atm, 0.00 degrees celsius, and 30.0 mL is 16.48mL.

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Since 4.184 Joules equals one calorie, simply we need to make a cross multiply equation.

4.184J/1cal=x J/230000cal

Then we can multiply the crosses and set them equal to each other. 4.184(230000)=1x

962320=x

The healthy breakfast supplies 962320 joules worth of food.

a sort of cell division that outcomes in two girl cells each having indistinguishable number and sort of chromosomes from the parent core, average of conventional tissue development.

Answer:

Mitosis is a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus, typical of ordinary tissue growth.

Mitosis is also the basis for healing wounds and fighting off invading pathogens that cause sickness. Certain organisms lose millions of cells per day as part of their normal function. Mitosis allows old cells to be replaced by new ones, ensuring an army of fully functioning cells.

(Hope this helps) Sky

Answer:

A

Explanation:

Answer:

es la A

Explanation:

Answer:

THE NEW PRESSURE OF THE HELIUM GAS IS 124kPa AFTER THE VOLUME WAS INCREASED FROM 2.48 L TO 2.98 L

Explanation:

Using Boyle's law which states that at constant temperature, the pressure of a given gas is inversely proportional to the volume occupied by the gas.

Mathematically,

P1 V1 = P2 V2

P1 = 150 kPa = 150 * 10^3 Pa

V1 = 2.48 L

V2 = 2.98 L

P2 = ?

Rearranging the formula making P2 the subject of the equation, we obtain;

P2 = P1 V1 / V2

P2 = 150 * 10^3 * 2.48 / 2.98

P2 = 372 * 10 ^3 / 2.98

P2 = 124.83 * 10^3 Pa or 124.8kPa

In other words, the new pressure of the helium gas after its volume was increased from 2.48 L to 2.98 L is 124.8kPa.

Answer:

red

Blue litmus paper turns red under acidic condition

Explanation:

Answer: Acidic Ph Levels: Lime green, yellow, orangle, and red

Explanation:

Alkaine Ph Levels: Purple, blue, and light green.

Neutral Ph Level: A bright green.

Acidic Ph Levels: Lime green, yellow, orangle, and red

Therefore, once the Ph paper indicates if the color is lime green, yellow, orangle, or red then that means it's acidic.

I hope this helps!

Answer: C. Rectum

Explanation:

Answer:

Uranium

Explanation:

Answer:

Uranium

Explanation:

Answer:

I. hurricanes

Explanation:

Answer:

C

Explanation:

Reptiles generally pose some sort of natural bewilderment to most people.

Answer:

Total heat required to raise the temperature of water from 45.7°C to 103.5°C

= 249,362.4 J

Explanation:

The Heat required to raise the temperature of 100.0 g of water from 45.7°C to 103.5°C will be a sum of;

- The heat required to raise the 100 g of water from 45.7°C to water's boiling point of 100°C

- The Heat required to vaporize the 100 g of water at its boiling point

- The Heat required to raise the temperature of this vapour from 100°C to 103.5°C

1) The heat required to raise the 100 g of water from 45.7°C to water's boiling point of 100°C

Q = mCΔT

m = 100 g

C = 4.18 J/g.°C

ΔT = change in temperature = (100 - 45.7) = 54.3°C

Q = 100 × 4.18 × 54.3 = 22,697.4 J

2) The Heat required to vaporize the 100 g of water at its boiling point

Q = mL

m = 100 g

L = ΔHvaporization = 2260 J/g

Q = mL = 100 × 2260 = 226,000 J

3) The Heat required to raise the temperature of this vapour from 100°C to 103.5°C

Q = mCΔT

m = 100 g

C = 1.90 J/g.°C

ΔT = change in temperature = (103.5 - 100) = 3.5°C

Q = 100 × 1.9 × 3.5 = 665 J

Total heat required to raise the temperature of water from 45.7°C to 103.5°C

= 22,697.4 + 226,000 + 665

= 249,362.4 J

Hope this Helps!!!

Answer:

249362.4 J

Explanation:

The following were Data were obtained from the question:

Mass (M) = 100g

Initial temperature (T1) = 45.7°C

Final temperature (T2) = 103.5°C

Heat of vaporisation (ΔHv) = 2260 J/g

Specific heat capacity (C) of steam = 1.90 J/g

Specific heat capacity (C) of water = 4.18 J/g

To calculate the heat needed to increase the temperature of water from 45.7°C to 103.5°C, the following must be observed:

Step 1:

Determination of the heat needed to raise the temperature of water from

45.7°C to its boiling point 100°C.

This is illustrated below:

Mass (M) = 100g

Initial temperature (T1) = 45.7°C

Final temperature (T2) = 100°C

Specific heat capacity (C) of water = 4.18 J/g

Change in temperature (ΔT) = T2 – T1 = 100°C – 45.7°C = 54.3°C

Heat (Q1) =?

Q = MCΔT

Q1 = 100 x 4.18 x 54.3

Q1 = 22697.4 J

Step 2:

Determination of the heat needed to vaporise 100g of water.

This is illustrated below:

Mass (M) = 100g

Heat of vaporisation (ΔHv) = 2260 J/g

Heat (Q2) =?

Q2 = MΔHv

Q2 = 100 x 2260

Q2 = 226000 J

Step 3:

Determination of the heat needed to raise the temperature of steam from 100°C to 103.5°C.

This is illustrated below:

Mass (M) = 100g

Initial temperature (T1) = 100°C

Final temperature (T2) = 103.5°C

Specific heat capacity (C) of steam = 1.90 J/g

Change in temperature (ΔT) = T2 – T1 = 103.5°C – 100°C = 3.5°C

Heat (Q3) =?

Q3 = MCΔT

Q3 = 100 x 1.9 x 3.5

Q3 = 665 J

Step 4:

Determination of the overall heat needed.

This is simply obtained by adding all the heat calculated above. This is illustrated:

QT = Q1 + Q2 + Q3

Q1 = 22697.4 J

Q2 = 226000 J

Q3 = 665 J

Total heat (QT) =..?

QT = Q1 + Q2 + Q3

QT = 22697.4 + 226000 + 665

QT = 249362.4 J

Therefore, the heat needed to increase the temperature of 100g of water from 45.7°C to 103.5°C is 249362.4 J

Answer:

A system is a group of related parts that work together as a whole.

Explanation:

edmentum.

A system is a set of interacting elements regarded as a distinctive entity for the purpose of study or observation. It can be physical like planets in a solar system, abstract like the systems operating in a computer, or organic like our nervous system.

A system can be defined as a set of elements that interact with each other and can be considered as a single entity, often for the purpose of study or analysis. This grouping can be physical, such as planets in a solar system, or conceptual, like the motor and visual systems in the human body. Systems, whether isolated, closed, or open, abide by certain laws, including conservation laws. Isolated and closed systems have minimal interactions with their environment, while open systems can exchange energy and/or matter with their surroundings.

Examples of systems can be seen everywhere, from how your computer operates as a system, to natural systems such as your nervous system processing sensory information and controlling your body's functions.

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complete question:

Calculate the volume of each solution, in liters.

b. a 0.5 M solution containing 250 g of manganese (II) chloride (MnCl₂)

c. a 0.4 M solution containing 290 g of aluminum nitrate (Al(NO₃)₃)

Answer:

b. L ≈ 4.00 litres

c. L ≈ 3.4 litres

Explanation:

Molarity is the number of moles of solute per litre of solution. Together a solute and a solvent makes a solution. The formula for molarity can be represented below

M = number of moles of the solute(mol)/L

where

M = molarity

mol = number of moles of the solute

L = litre of the solution.

Therefore ,

The volume of each solution can be computed below

b. a 0.5 M solution containing 250 g of manganese (II) chloride (MnCl₂)

M = number of moles of the solute(mol)/L

number of moles of MnCl₂ = mass/molar mass

molar mass of MnCl₂ = 55 + 71 = 126 g/mol

number of moles of MnCl₂ = 250/126

number of moles of MnCl₂ = 1.9841 moles

0.5 = 1.9841/L

cross multiply

0.5L = 1.9841

L = 1.9841/0.5

L = 3.97

L ≈ 4.00 litres

c. a 0.4 M solution containing 290 g of aluminum nitrate Al(NO₃)₃

M = number of moles of the solute(mol)/L

number of moles = mass/molar mass

molar mass of Al(NO₃)₃ = 27 + 14 × 3 + 48 × 3 = 27 + 42 + 144 = 213

number of moles = 290/213 = 1.3615 moles

M = number of moles of the solute(mol)/L

0.4 =  1.3615/L

cross multiply

0.4L = 1.3615

divide both sides by 0.4

L = 1.3615/0.4

L = 3.4 litres

Answer:

your answer

Explanation:

Answer:

B.) A new substance is not formed

Explanation:

hope this helps

Ice melting is not a chemical change because a  new substance is not formed.

Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.

There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical changes:

1) inorganic changes

2)organic changes

3) biochemical changes

During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

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Answer:

6.02 x10^23

Explanation:

just did it on edge

The value gives the number of particles in 1 mol of a substance is 6.02 Times. 1023. Therefore, option C is correct.

The International System of Units uses the mole (symbol: mol) as the unit of material quantity. How many elementary entities of a particular substance are present in an object or sample is determined by the quantity of that material. It is specified that the mole contains exactly 6.022 * 1023 elementary entities.

The mole, often known as mol, is a SI unit that counts the particles in a given substance.One mole is equal to 6.02214179×1023 atoms, or other elementary units such as molecules.

Avogadro's number is another name for this number. Keep in mind that a mole is defined as a quantity of stuff. A mole is the amount (10) of material containing 6.02214 × 1023 particles. 1 mol = 6.02214 × 1023 particles.

Thus, option C is correct.

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Answer:

Over 700,000 lives are taken by the AIDs virus every year. Hepatitis C claims the lives of over 200,000 people each year and haemorrhagic fevers caused by viruses such as Ebola have resulted in over 20,000 deaths.

Explanation:

Answer:

Phase change from a liquid to a gas occurring at a specific  temperature and pressure

Explanation:

Boiling is a physical process in which a substance changes its state from liquid to vapor state.

In this context ,boiling point is the threshold temperature at which changes of state from liquid to vapor occurs. The boiling point also depends upon atmospheric pressure of environment as well. For the same substance, boiling point at  two different pressure will differ significantly.

For example : Boiling point of water at sea level is 100 degree Celsius

while at 6,250 ft , Boiling point of water  is 93.4 degree Celsius.

Based on above discussion option B Phase change from a liquid to a gas occurring at a specific  temperature and pressure is the correct answer.

Answer: B) Phase change from a liquid to a gas occurring at a specific temperature and pressure.

Answer:

drought

Explanation:

In an ecosystem, some plant seeds are adapted to sprout with a limited amount of water. They are adapted to drought.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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Answer:

The moon's path around Earth is tilted compared to Earth's orbit around the sun. The moon can be behind Earth but still get hit by light from the sun. In this diagram, you can see that the moon's orbit around Earth is at a tilt. This is why we don't get a lunar eclipse every month.

So, I think it is A.

Explanation:

I hope that helps. I don't know if it is right or wrong, but good luck :)

Answer:

Explanation:

They both have the same effect just one is whole and the other is half

Answer:

K-47 undergoes beta decay

Hg-190 undergoes electron capture or alpha decay

Th-232 undergoes alpha decay

Na-20 undergoes positron emission

I-137 undergoes beta decay

Explanation:

Stability of a nucleus is decided by the neutron /proton (n/p) ratio. For lower elements of atomic number 1-20, n/p=1. Elements with higher atomic numbers tend to have a slight excess of neutrons to reduce the repulsive forces between the protons.

Beta emission decreases the n/p ratio, positron emission increases the n/p ratio, electron capture increases the n/p ratio and alpha decay increases the n/p ratio.

Note that a nucleus may undergo several decay processes before stable nucleus (nuclei) is/are formed.

The decay mode of radioactive isotopes is primarily determined by the atomic number (Z) and the neutron-proton (n/p) ratio. For example, K-47 and Hg-190, with high n/p ratios, would decay through β emission. Th-232, having Z≥84 and a high n/p ratio would undergo α emission. Na-20, being a light nucleus with a low n/p ratio would do positron emission, and I-137 with high n/p ratio would do β emission.

Based on our understanding of nuclear stability and decay, radioactive isotopes decay in a way that brings them closer to a state of stability. They do this by adjusting their neutron to proton ratios (n/p) through various forms of decay. The mode of decay depends largely on the Z number (atomic number) and the n/p ratio.

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Answer:

The stoichiometric coefficients in your balanced chemical equation can represent molecules or moles or molarity.

When you balance an equation, you can use the coefficients to determine the quantity of either products or reactants. If the reaction occurs in water, then you can either do the conversion from reactants to products using moles or molarity.

Explanation:

For example, if you have a 1.5M solution of H2SO4, then the concentration of SO4-2 in solution can be determined by the balanced dissociation equation H2SO4 = 2H+ + SO4-2.

1.5M H2SO4(1M SO4-2/1M H2SO4) = 1.5 M SO4-2

Final answer:

Molarity is a key conversion factor in stoichiometry that relates the amount of a solute in moles to the volume of solution, facilitating calculations involving solution concentrations and chemical reactions.

Explanation:

Molarity can be used in stoichiometry calculations to determine quantities in chemical reactions. When dealing with stoichiometry problems involving solutions, molarity serves as a direct conversion factor because it is based on the mole unit. For instance, consider the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH):

HCl(aq) + NaOH(s) → H₂O(l) + NaCl(aq)

To find out how many liters of aqueous HCl will react with a given mass of NaOH, we perform the following steps:

Note that the molarity acts as a bridge between the amount of solute (HCl) and the volume of the solution.