Which kind of reaction does this graph represent?
A. endothermic because AHrxn = -876.8 kJ
B. endothermic because A Hoxn = 876.8 kJ
C. exothermic because Ahox = -1,099.6 kJ
D. exothermic because AHoxn = 1.099.6 kJ

Answer:

cell - basic unit of structure and function of all living things

tissue - a group of cells that work together to perform a common function

organ - a group of tissues that work together to perform a common function

organ system - group of organs that work together to perform a common function

Explanation:

What you have there is the biological level of organization. It is how living things are organized from the simplest to the most complex. Each level makes up another level.

As you can see in your exercise, the basic unit of life is the cell and cells make up tissues, while tissues make up organs and so forth. There are higher levels of organizations passed organ system.

Cell - tissue - organ - organ system - organism - population - community - ecosystem - biosphere

Thermal energy

Mechanical energy

Chemical energy

Answer:

electromagnetic

Explanation:

Answer:

(Fe(OH)2 + Na2SO4

Explanation:

Iron (II) hydroxide precipitate. Iron (II) hydroxide precipitate (Fe(OH)2) formed by adding few drops of a 1M solution of sodium hydroxide (NaOH) to 0.2 M solution ferrous sulfate (FeSO4). The reaction is FeSO4 + NaOH -> Fe(OH)2 + Na2SO4. This is an example of a double replacement reaction. Pure iron (II) hydroxide is white, however even trace amounts of oxygen make it greenish.

Answer:

38.7 g

Explanation:

first you find the molar mass of Nickle(II) Perchlorate

Nickle = 58.693 g/mol

Perchlorate is Chlorine and Oxygen combined

Molar mass of chlorine is 35.453 g/mol

Oxygen = 15.999 g/mol but since it has 4 oxygen atoms combined with chlorine you have to multiply 15.999 by 4 which is 63.996 add all the masses together and that gives you 158.142. Since you have moles you multiply the moles by the molar mass which looks like this. 0.245 * 158.142 which equals 38.74479 but with sign figs it is 38.7g as your final answer. Ask me if you are confused about something.

To find the mass of 0.245 moles of nickel(II) perchlorate, first calculate its molar mass by summing the atomic masses of nickel, chlorine, and oxygen, resulting in 257.59 g/mol. Then, multiply the number of moles (0.245) by the molar mass to get 63.11 grams.

To calculate the mass, in grams, of 0.245 moles of nickel(II) perchlorate, we need to determine the molar mass of nickel(II) perchlorate. This involves adding the atomic masses of all atoms in the formula. For nickel(II) perchlorate, Ni(ClO4)2, the calculation is as follows:

Adding these together, the molar mass of Ni(ClO4)2 = 58.69 + 70.90 + 128.00 = 257.59g/mol.

Now, to find the mass of 0.245 moles of nickel(II) perchlorate:

Mass = number of moles × molar mass = 0.245 moles × 257.59 g/mol = 63.11 grams.

Therefore, 0.245 moles of nickel(II) perchlorate has a mass of 63.11 grams.

Answer:

The answer is Cell

Explanation:

Answer:

The answer is cell. A cell is the smallest unit of a living thing.

Answer:

a

Explanation:

The difference between asexual and sexual is one letter "a". this is becuase if you subtract the first letter a off of asexual then you get sexual.

Answer: I believe it is coal

Explanation: Coal is the most polluting fossil fuel

Answer:

coal (a)

Explanation:

Answer:

Density=1.25g/dm^3

Explanation:

Density=mass/volume

Mass of nitrogen gas is 2(14)=28g

Volume at STP=22.4dm^3

Density=28/22.4=1.25g/dm^3

The mass is the molar mass of N₂ (28.01 g) and the volume is 1.25 L

To calculate the density of nitrogen gas at STP using the molar volume of a gas at STP, you can follow these steps:

1. Understand the concept: Molar volume of a gas at STP (Standard Temperature and Pressure) is 22.4 L/mol.

2. Determine the molar mass of nitrogen: The molar mass of nitrogen (N2) is approximately 28.02 g/mol.

3. Use the ideal gas law: The ideal gas law states that PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is temperature.

4. Calculate the number of moles: Since the molar volume at STP is 22.4 L/mol, and the volume is equal to 22.4 liters, the number of moles of nitrogen gas is 1 mole.

5. Calculate the density: Density (ρ) is defined as mass divided by volume. Since we have one mole of nitrogen gas, which weighs 28.02 grams, we can calculate the density as follows:

Therefore , the density of nitrogen gas at STP is 1.25 g/ L

Answer:

i like cheese pizza the best

Explanation:

it smacks

Answer:

Mass, M is 440.883g

Explanation:

Given the following;

Moles=4.5moles

Molar mass of H3PO4=

Atomic mass of Hydrogen H=(1*3)=3

Atomic mass of Phosphorus P=30.974

Atomic mass of Oxygen O=(16*4)=64

Therefore, Molar mass is;

H3PO4=3+30.974+64=97.974g/mol

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

Mass M = Number of moles × Molar mass

M = 4.5 × 97.974

M = 440.883g

The _HIGHER__ vapor pressure at high altitudes causes a liquid to boil at a _LOWER___ temperature.

Explanation:

Vapor pressure is the pressure applied by the molecule of a liquid at the surface of the liquid as it transitions into a gaseous phase. When the vapor pressure exceeds the atmospheric pressure, this is when the liquid begins to boil. Therefore when the atmospheric pressure is low, then the liquid will boil at lower temperatures, because the vapor pressure of the liquid will overcome the atmospheric pressure at lower temperatures.

Answer:

The reduced vapor pressure at high altitudes causes a liquid to boil at a lower temperature.

Explanation:

A liquid will change its form when its vapor pressure higher than the atmospheric pressure. At higher altitudes, the air pressure will be lower since there will be less air above your head compared to the sea level. This means the atmospheric pressure will be lower, and the vapor pressure needed for the liquid will be reduced.  

The pressure is directly proportional to temperature. Since the vapor pressure required is lower, the liquid can start to boil at a lower temperatures.

Answer:

low pressure which means means stormy weather

Explanation:

welcome to brainily, and hope this helps

Answer:

Low pressure

Explanation:

When there is a L it means low pressure which means rainy weather.It usually brings lots of rain and wind.

Answer:

Corn stalks  

Explanation:

Biomass fuel is produced by living or once-living organisms.

The most common biomass fuels used for energy come from plants, such as corn and soy.

B is wrong. Yellowcake is a refined form of uranium ore.  

C and D are wrong. Coal and natural gas are not biomass fuels.

Felsic magma, with its high silica content and high gas levels, leads to the most explosive volcanic eruptions due to the build-up of pressure and difficulty for gases to escape.

The type of magma that would produce the most explosive volcanic eruption is felsic magma. This kind of magma has high viscosity due to a higher silica content of around 70% SiO2 and contains a large amount of gas, making it quite thick. These characteristics prevent gases from escaping easily, resulting in a build-up of pressure within the magma chamber. When the pressure becomes too great, the magma breaks through the surface in a catastrophic explosion, sending rock, ash, and pyroclastic debris into the atmosphere. The explosiveness of felsic eruptions can be enhanced if there is rapid melting of ice or snow on a volcano, which can lead to devastating mudflows known as lahars.

Answer:

4- A material that transfers heat energy more easily than another material will experience a greater rate of thermal energy loss than an object that does not transfer heat energy easily.

Explanation:

Thermal energy loss has to do with loss of heat energy by a body to another body or its environment. The aim of the process is usually the attainment of thermal equilibrium between the body and its environment.

On a cold day, a material that transfers thermal energy more easily will loose thermal energy faster than an object that does not transfer thermal energy. The rate of heat transfer of a body determines its rate of loss of thermal energy.

The correct statement is 4. A material that transfers heat energy more easily than another material will experience a greater rate of thermal energy loss than an object that does not transfer heat energy easily.

To understand why option 4 is correct, let's consider the principles of heat transfer. Heat energy can be transferred in three ways: conduction, convection, and radiation. A material that transfers heat energy more easily is a better conductor of heat. This means that it allows heat to move through it more readily, either from a warmer to a cooler region or vice versa.

 On a cold day, an object's thermal energy will naturally tend to flow towards the cooler surroundings because of the temperature difference. If the material of the object is a good conductor of heat (i.e., it transfers heat energy more easily), it will lose its thermal energy to the environment at a faster rate compared to a material that is a poor conductor of heat (an insulator). This is because the good conductor does not impede the flow of heat energy, allowing it to move towards the colder surroundings more quickly.

 Conversely, a material that does not transfer heat energy easily, such as an insulator, will impede the flow of heat energy. This means that less thermal energy will be lost from the object to the environment over a given period of time, thus minimizing thermal energy loss.

Let's analyze the incorrect options:

 1. This statement is incorrect because a material that transfers heat energy at any rate will experience a change in thermal energy. If it transfers heat energy to its surroundings, it will lose thermal energy, not maintain the same level of energy.

 2. This statement is the opposite of the correct principle. A material that transfers heat energy more easily will actually lose thermal energy faster, not slower.

3. This statement is incorrect because a material that transfers heat energy at any rate will not necessarily experience an increase in thermal energy. On a cold day, the material will lose heat energy to its surroundings, not gain it.

 In summary, to minimize an object's thermal energy loss on a cold day, one should use materials that do not transfer heat energy easily, as they will resist the flow of heat away from the object, thus keeping it warmer for a longer period of time.

Answer:

positively charged (+2).

4th element on the periodic table

I don't know what else to say srry if I failed my mission :')

An atom with 4 protons and 2 electrons can be expressed as a cation with a charge of 2⁺ if it has lost electrons or as a neutral atom if it hasn't undergone any electron changes.

An ion is an atom or molecule that has gained or lost electrons, resulting in an electrical charge. In this case, you've provided an atom with 4 protons and 2 electrons. To express this as an ion, we need to determine whether it has gained or lost electrons and the resulting charge.

If the atom has lost electrons:

An atom loses electrons when it becomes positively charged (cation).

In this scenario, with 4 protons and 2 electrons, it has lost 2 electrons.

This results in a net positive charge of 2⁺. So, the ion is written as:

Ion: Cation with a charge of 2⁺

For example, this could be a helium atom (He) that has lost its 2 electrons, becoming He²⁺.

If the atom has gained electrons:

An atom gains electrons when it becomes negatively charged (anion).

In this case, with 4 protons and 2 electrons, it has not gained or lost any electrons, maintaining a neutral charge.

Ion: Neutral Atom

So, depending on whether the atom gained or lost electrons, it can either be a cation with a charge of 2⁺ (if it lost electrons) or simply a neutral atom (if it maintained its original electron count).

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In polymer science, the backbone chain of a polymer is the longest series of covalently bonded atoms that together create the continuous chain of the molecule.

Answer:

The molarity is 2, 408M

Explanation:

A solution molar---> moles of solute in 1 L of solution (1000ml):

120ml solution --------0,289 mol FeCl3

1000ml solution-------x= (1000ml solutionx0,289 mol FeCl3)/120 ml solution

x=2,408mol FeCl3--> 2, 408M

Final answer:

The molarity of the FeCl3 solution is 2.41 M.

Explanation:

To calculate the molarity of 0.289 moles of FeCl3 dissolved in 120 ml of solution, we need to convert the volume of the solution to liters. 120 ml is equal to 0.120 L. Molarity is defined as the number of moles of solute divided by the volume of solution in liters. Therefore, the molarity of the FeCl3 solution is:

Molarity = moles of solute/volume of solution

Molarity = 0.289 moles FeCl3 / 0.120 L solution = 2.41 M.

Answer:

   ..                                ..

   ..                                 ..

Explanation:

The Lewis dot structure of N2Br4 is attached below. A Lewis dot structure is also known as a Lewis structure or electron dot structure.

It is a visual representation of the valence electrons in an atom or molecule. It uses dots to represent the valence electrons around the atomic symbol.

The Lewis dot structure is based on the octet rule, which states that atoms tend to gain, lose, or share electrons in order to achieve a stable electron configuration with eight valence electrons (except for hydrogen, which typically only requires two valence electrons).

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This statement is TRUE.

Explanation:

Due to the high heat capacity of water, it takes much more energy to have a gram of water raised by one degree compared to one gram of land. This is why during a hot day, the ground gets hotter faster than the adjacent oceans or adjacent lakes. It also takes water to lose the same amount of energy to have its temperatures drop by one degree as compared to land. During the night, therefore, this is why adjacent water bodies remain relatively warmer than land.

Answer:

      [tex]\large\boxed{\large\boxed{x=54\º}}[/tex]

Explanation:

In the figure, two secants that intersect outside a circle form an angle with measure of xº and the measures of the arcs formed are 136º and 28º.

When two secants intersect outside a circle, the measure of the angle formed is one-half the absolute difference of the measures of the intercepted arcs.

Then, you can write and solve this equation:

           [tex]x=\dfrac{1}{2}(136\º-28\º)\\\\\\x=54\º[/tex]

Answer:

Hello, Your answer will be B,C,E, And F.

Explanation:

An element is a substance whose atoms have same number of protons which means all atoms in an element have same atomic number. Elements are simplest substances which cannot be broken down by physical changes or chemical reactions. Elements are classified by their names and symbols. Hope That Helps!

Answer:

your answer would be A,B and E

Explanation:

i got it right on edge

Answer:

Photosynthesis

Explanation:

Photosynthesis:

It is the process in which in the presence of sun light and chlorophyll by using carbon dioxide and water plants produce the oxygen and glucose.  The oxygen produced during photosynthesis is used in cellular respiration.

The sun light is converted into chemical energy in the form of sugar.

Word equation:

Carbon dioxide + water + energy →   glucose + oxygen

water is supplied through the roots, carbon dioxide collected through stomata and sun light is capture  by chloroplast.

Chemical equation:

6H₂O + 6CO₂ + energy  →   C₆H₁₂O₆ + 6O₂

it is known from balanced chemical equation that 6 moles of carbon dioxide react with the six moles of water and created one mole of glucose and six mole of oxygen.

Answer:

Explanation:

Use a upper case to identify the dominant allele and lower case to identify recessive allele.

A homozygous pea plant would be YY or gg. The homozygous recessive pea pleant would be gg (YY is dominant).

A heterozygous pea plant would be Yg (or gY which is the same).

The Punnett Square for the cross between a homozygous recessive pea plant (gg) and a heterozygous pea plant (Yg) would be:

                 g        g

       Y      Yg      Yg

       g      gg      gg

Hence, the offspring will have two Yg, which would be yellow pods, and two gg which would be green pods.

That is, 50% of the offspring will have yellow pods and 50% will have green pods.

Answer:

Explanation:

The specific heat of a substance is the amount of heat required to the raise the temperature of a unit mass of substance by 1°C.

This physical quantity is usually determined in the laboratory. It is an intensive property of substances and a constant for pure samples of material.

Specific heat for the steel wire    0.82J/g°C

specific heat for the steel wire    0.47J/g°C

specific heat for the lead pellets    0.25J/g°C

Specific heat has been defined as the amount of heat required to raise the temperature of 1 gram of substance by 1 degree Celsius.

It has been a physical quantity and has been directly proportional to the motion of molecules.

The increase in mass of the substance results in the increase in the attraction force and thus the motion of the atoms has been slow down. Thus, with the increase in mass of the element, the specific heat decreases.

The specific heat of the following elements has been:

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Answer:

12.9

Explanation:

From the question given, the concentration of the hydroxide ion is given:

[OH^-] = 1.4 x 10^ -13M

pOH =?

pOH = —Log [OH^-]

pOH = —Log 1.4 x 10^ -13

pOH = 12.9

Answer :

(i) The number of atoms present in 7 g of lithium are, [tex]6.07\times 10^{23}[/tex]

(ii) The number of atoms present in 7 g of lithium are, [tex]1.204\times 10^{24}[/tex]

(iii) The number of moles of [tex]F_2[/tex] is, 1 mole

The number of moles of [tex]CO_2[/tex] is, 0.5 mole

The number of moles of [tex]OH^-[/tex] is, 1 mole

Explanation :

Part (i) :

First we have to calculate the moles of lithium.

[tex]\text{Moles of }Li=\frac{\text{Mass of }Li}{\text{Molar mass of }Li}[/tex]

Molar mass of Li = 6.94 g/mole

[tex]\text{Moles of }Li=\frac{7g}{6.94g/mol}=1.008mole[/tex]

Now we have to calculate the number of atoms present.

As, 1 mole of lithium contains [tex]6.022\times 10^{23}[/tex] number of atoms

So, 1.008 mole of lithium contains [tex]1.008\times 6.022\times 10^{23}=6.07\times 10^{23}[/tex] number of atoms

Thus, the number of atoms present in 7 g of lithium are, [tex]6.07\times 10^{23}[/tex]

Part (ii) :

First we have to calculate the moles of carbon.

[tex]\text{Moles of }C=\frac{\text{Mass of }C}{\text{Molar mass of }C}[/tex]

Molar mass of C = 12 g/mole

[tex]\text{Moles of }C=\frac{24g}{12g/mol}=2mole[/tex]

Now we have to calculate the number of atoms present.

As, 1 mole of carbon contains [tex]6.022\times 10^{23}[/tex] number of atoms

So, 2 mole of carbon contains [tex]2\times 6.022\times 10^{23}=1.204\times 10^{24}[/tex] number of atoms

Thus, the number of atoms present in 7 g of lithium are, [tex]1.204\times 10^{24}[/tex]

Part (iii) :

To calculate the moles of [tex]F_2[/tex] :

[tex]\text{Moles of }F_2=\frac{\text{Mass of }F_2}{\text{Molar mass of }F_2}[/tex]

Molar mass of [tex]F_2[/tex] = 38 g/mole

[tex]\text{Moles of }F_2=\frac{19g}{19g/mol}=1mole[/tex]

Thus, the number of moles of [tex]F_2[/tex] is, 1 mole

To calculate the moles of [tex]CO_2[/tex] :

[tex]\text{Moles of }CO_2=\frac{\text{Mass of }CO_2}{\text{Molar mass of }CO_2}[/tex]

Molar mass of [tex]CO_2[/tex] = 44 g/mole

[tex]\text{Moles of }CO_2=\frac{22g}{44g/mol}=0.5mole[/tex]

Thus, the number of moles of [tex]CO_2[/tex] is, 0.5 mole

To calculate the moles of [tex]OH^-[/tex] ions :

[tex]\text{Moles of }OH^-=\frac{\text{Mass of }OH^-}{\text{Molar mass of }OH^-}[/tex]

Molar mass of [tex]OH^-[/tex] = 17 g/mole

[tex]\text{Moles of }OH^-=\frac{17g}{17g/mol}=1mole[/tex]

Thus, the number of moles of [tex]OH^-[/tex] is, 1 mole

1. The number of atoms in 7 g of Li is 6.02×10²³ atoms

2. The number of atoms in 24 g of carbon is 1.204×10²⁴ atoms

3. The number of mole in 19 g of fluorine is 1 mole

4. The number of mole in 22 g of carbon dioxide is 0.5 mole

5. The number of mole in 17 g of Hydroxide ion is 1 mole

From Avogadro's hypothesis,

1 mole of Li = 6.02×10²³ atoms

But,

1 mole of Li = 7 g

Thus,

7 g of Li = 6.02×10²³ atoms

From Avogadro's hypothesis,

1 mole of C = 6.02×10²³ atoms

But,

1 mole of C = 12 g

Thus, we can say that

12 g of C = 6.02×10²³ atoms

Therefore,

24 g of C = (24 × 6.02×10²³) / 12

24 g of C = 1.204×10²⁴ atoms

Mole = mass / molar mass

Mole of fluorine = 19 / 19

Mole of fluorine = 1 mole

Mole = mass / molar mass

Mole of CO₂ = 22 / 44

Mole of CO₂ = 0.5 mole

Mole = mass / molar mass

Mole of OH¯ = 17 / 17

Mole of OH¯ = 1 mole

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Reactant C should be considered as the limiting reactant in this given situation.

Since

A balanced chemical reaction is:

A + 2B + 3C → 2D + E

And, number of moles should be

A = 0.50 mole

B = 0.60 moles

C = 0.90 moles

Now here we considered A as the reactant

So,

1 mole of A reacted to form 2 moles of D

0.50 moles of A will produce  = 1 mole of D

Now considered  B as the reactant

2 moles of B reacted to form 2 moles of D

0.60 moles of B reacted to form x moles of D

x = 2 moles of D is produced.

Now considered C as the reactant:

3 moles of C reacted to form 2 moles of D

O.9 moles of C reacted to form x moles of D

= 0.60 moles of D is formed.

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