Which of the following statements is true?

plants store excess energy in lipid molecules

sugar and starches are energy-poor

starches form sugar molecules

sugar molecules form starches

PLEASE ANSWER CORRECTLY FOR 10 POINTS

Answer:

C

H3OH(g⇌CO(g)+2H2(g)ΔH=+90.7kJ

The sign of the given value of enthalpy is positive which means the heat is released from the system.

Hence, the reaction is an endothermic reaction.

Explanation:

This problem is providing the masses of both NaHCO3 and HCl and the initial and final temperature due to the reaction. It asks for the balanced chemical equation, the direction and quantity of heat and the consumed moles.

In chemistry, calorimetry in chemical reactions basically allows us to quantify the chemical heat that is involved in a chemical change due to the rearrangement of bonds when the reactants get in contact.

In such a way, one can start this problem by writing and balancing the undergoing chemical equation between NaHCO3 and HCl, according to the law of conservation of mass:

[tex]NaHCO_3 + HCl\rightarrow NaCl+H_2O+CO_2[/tex]

Which is already balanced as equal number of sodium, hydrogen, carbon and oxygen are present on both sides of the equation.

Next, since the final temperature of the resulting solution was lower than the initial temperature, one comes to the conclusion that the reaction is endothermic, as the energy was released by the solution and absorbed by the reaction.

Thereafter, given the general equation for the calculation of heat:

[tex]Q=mC\Delta T\\\\[/tex]

One can calculate the heat involved in the reaction, assuming the specific heat of the solution equals waters:

[tex]Q=-(2.58g+49.00g)*4.184\frac{J}{g\°C}(17.4-21.4)\°C \\\\Q=-863J*\frac{1kJ}{1000J}=0.863 kJ[/tex]

Which adopts the negative sign at the beginning, because of the flow of heat which make the heat of reaction the negative of that of the solution.

Finally, we use some stoichiometry to calculate the number of moles of sodium bicarbonate and hydrochloric acid used in the reaction:

[tex]2.58gNaHCO_3 *\frac{1molNaHCO_3}{84.0gNaHCO_3}=0.0478molNaHCO_3\\ \\49.00gHCl*\frac{1molHCl}{36.46gHCl}=1.344molHCl[/tex]

Hence, since they react in a 1:1 mole ratio, we can see the excess HCl in the reaction, and thereby, the correct number of moles, reacting in the chemical reaction are just 0.0478 mol of the both of them.

a. [tex]NaHCO_3 + HCl\rightarrow NaCl+H_2O+CO_2[/tex]

b. The reaction is endothermic, as the energy was released by the solution and absorbed by the reaction

c. 0.863 kJ

d. 0.0478 mol

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5.31 g of lithium contains  4.567 x 10^23 atoms.

The average mass (in grams) of one calcium, Ca, atom is 6.64 * 10^-23 g.

The average mass (in grams) of one mole of Ca atoms is 40.0 g.

The molar mass of lithium is 7.0 g

One mole of lithium atom contains 6.02 * 10^23 atoms.

6.02 * 10^23 atoms of lithium weighs 7.0 g

4.567 x 10^23 atoms of lithium will weigh 4.567 x 10^23 * 7.0 g/6.02 * 10^23 = 5.31 g

Therefore, 5.31 g of lithium contains  4.567 x 10^23 atoms.

6.02 * 10^23 atoms of calcium weigh 40.0 g

1 atom will weigh 1 * 40.0 g/6.02 * 10^23 = 6.64 * 10^-23 g

Therefore, the average mass (in grams) of one calcium, Ca, atom is 6.64 * 10^-23 g.

The molar mass of calcium is 40.0 g

Therefore, the average mass (in grams) of one mole of Ca atoms is 40.0 g.

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Answer:

theoretical yield

Explanation:

Theoretical yield is the maximum possible amount of product obtained in a chemical reaction .

Theoretical yield is the quantity of a product obtained from the complete transformation  of the limiting reactant in a chemical reaction.

Theoretical yield is commonly expressed in terms of grams or moles.

It can be calculated from-:

The balanced chemical equation, the mass and relative formula mass of the limiting reactant, and the relative formula mass of the product.

Hence ,theoretical yield is the maximum possible amount of product obtained in a chemical reaction .

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Answer:

it should be  0-0

Explanation:

Answer:

Explanation:

if the side lengths of a triangle are equal then the angles opposite to those sides are equal . This is a case of an isosceles triangle .

And if all the sides of a triangle are equal then all the angles of a triangle will be equal . This is a case of an equilateral triangle.

Answer:

5. The excited players celebrated because they won the game. 6. Everyone at the birthday party ate the delicious birthday cake is the question

Explanation:

The acceleration can be defined as the change in velocity with respect to time. The velocity of the particle is 1200 m/s.

The movement of the particles is described with the rate of change in the position of the object with respect to time. The change in position, velocity, and acceleration is given by the Newton's kinematics equations.

The velocity of particle with respect to acceleration can be given as:

[tex]v=u+at[/tex]

Where, the initial position rest has the initial velocity, [tex]u=0\rm \;m/s[/tex]

The acceleration of the particle, [tex]a= 8. 0\;\rm m/s^2[/tex]

The time for the final velocity, [tex]t=150\;\rm sec[/tex]

Substituting the values in the equation for final velocity, v:

[tex]v= 0+ 8. 0\;\times\;150\;\rm m/s\\\textit v=1200\;m/s[/tex]

The velocity of the particle after 150 seconds is 1200 m/s.

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Explanation:

hope this helps you,

-s.

Aqueous potassium iodide reacts with aqueous copper(II) sulfate to produce iodine. The balance chemical equation for this reaction. 2CuSO4 + 4KI⟶ 2CuI + I2 + 2K2SO4.

A chemical equation is said to be balanced if the quantity of each type of atom in the reaction is the same on both the reactant and product sides. In a balanced chemical equation, the mass and the change are both equal.

The chemical equation is said to be balanced if there are no inequalities. Every element in this illustration now has the same amount of atoms on the reactant and product sides.

The law of conservation of mass states that when a chemical reaction takes place, the mass of the reactants and products should be equal. As a result, during the chemical process, the number of atoms in each element remains constant. The chemical equation must be balanced as a result.

Thus, The balance chemical equation for this reaction. 2CuSO4 + 4KI⟶ 2CuI + I2 + 2K2SO4.

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Answer:

Because scientists call vaccines reagents.

Answer:

I think this is the right answer. I researched this. I am not sure if this is the right answer.

Most of the world's active volcanoes are located along or near the boundaries between shifting plates and are called "plate-boundary" volcanoes. The double lines indicate zones of spreading from which plates are moving apart

Explanation:

The best thing to do if a hypothesis was found to be wrong after conducting an investigation would be to write a new hypothesis and conduct new experiments to explore the matter.

The formulation of hypotheses is one of the key steps in the scientific method.

Hypotheses are usually tested using experiments and are usually accepted or rejected depending on the outcome of the experiments.

If a hypothesis is rejected, it does not mean that the entire subject is abandoned. Rather, new hypotheses may be formed and experiments conducted to further explore the subject.

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Answer:

The best thing to do if a hypothesis was found to be wrong after conducting an investigation would be to write a new hypothesis and conduct new experiments to explore the matter.

Explanation:

Answer:it decreases

Explanation:

Answer:

n order to get that molecule you hgave to go into atoms like the skin of of it.... I'm just trying to sound smartI

Explanation:

Answer:

Explanation:

Hope it helps you :)

Keep Learning :)

Answer:A

Explanation:

just took the quiz

Answer:

bile salts emulsify fats and break them down into smaller particles which gives the enzyme lipase a greater surface area to act on during digestion of fats.

Explanation:

Answer:

64

Explanation:

since it's a cube all sides are equal

and to calculate volume you multiply the length by the hieght by the width

Answer:

This is true: Lunar eclipses happen more often. I think it's just a question of how big the shadows are: There is a lunar eclipse when the Earth blocks the Moon's light from the Sun. 7000 km away from the Moon, the Earth's shadow is about two lunar diameters wide. Much wider than a pancake. The reason that the moon turns red, is due to Earth's atmosphere. It bends red rays of sunlight into our planet's shadow and scatters out blue rays of light.

When the Moon casts a shadow on the Earth, it is called a solar eclipse. The Moon is a lot smaller now, and its shadow is also a lot smaller than it was before. Around 200 or 300 km across is how big the Moon's shadow is when it's far from the Earth.

Fun Facts:

- The 21st century has 224 solar eclipses and 230 lunar eclipses (all varieties of each combined)

Answer: Can pick it up and hold it, can rotate groups about bonds

and can look for symmetry

Explanation: A molecular model is a plastic model with interchangeable balls. Represents molecules and their processes.

The creation of mathematical models of molecular properties and behavior is molecular modelling, and their graphical depiction is molecular graphics, but these topics are closely linked and each uses techniques from the others.

Answer:

thanks for the pointthanks for the pointthanks for the point

Explanation:

Answer:

chemical reactions which proceed with the release of heat energy are called exothermic reactions

Answer:

The substance with a weaker molecular attraction

Answer:

"6,000-year-old seeds from an ancient culture" is one example among the following examples given in the question that carbon-14 dating would be appropriate for dating.

Explanation:

Thought you meant by something els sorry :)

Answer:

see explanation

Explanation:

(Molarity x Volume)concentrate = (Molarity x Volume)diluted

14M x V(concentrate) = 5M x 3L

V(concentrate) = (5M x 3L)/14M = 1.07L of concentrate needed

Mixing:

On mixing water directly into nitric acid at high concentrations the solution tends to hydrate very rapidly and release heat extensively and perhaps splash back solution onto surroundings. Thus, one should apply caution and wear safety clothing; i.e., gloves and protective eye ware while working with such systems.

With the hazards of mixing in mind, one should first add a small quantity of water solvent into the mixing vessel, perhaps 0.50L - 1.00L of the solvent water. Then slowly add the needed amount (in this case 1.07L of the 14M nitric acid solution) of nitric acid into the solvent water. Then dilute further with solvent water up to but not to exceed the 3L reference mark of the mixing container. Mix and carefully transfer the new solution (3L of 5M HNO₃) into an appropriate storage container and seal.

Note: As with any chemical of interest, one should review the MSDS for the reagent being used, noting hazards and proper laboratory handling in order to avoid accidents and/or injury that may occur as a result of improper use.

As a general rule, always add acid into water, NEVER water into acid. Remember A&W (acid into water) root beer.

Answer:

Jim's car travels: 12.04 meters per second.

Tara's car travels 12 meters per second.

Explanation:

Tara's car travels the fastest.

Answer:

the concentration of reactants, temperature, and shape of the molecules.

Explanation:

Hope this helps. Brainliest please

The energy of the collision must be higher than the energy of the reaction. The appropriate orientation for the collision must be used. The frequency of the collision must be higher than the frequency of the reaction. The reactants must run into each other.

According to the collision theory, for a chemical reaction to take place, the reacting particles must come into contact with one another. The frequency of collisions affects the reaction's rate. According to the idea, responding particles frequently encounter without reacting.

The type of the reactants, concentration, surface area, temperature, and catalysts are some of these variables. Because they all increase the quantity or energy of collisions, these factors all increase reaction rate.

The frequency of collisions and the number of effective collisions over time are influenced by temperature, gaseous reactant pressure, and reactant concentration, claims the collision hypothesis.

The reacting elements must collide, and they must do so with the appropriate orientation and sufficient energy.

Thus, The frequency of the collision must be higher than the frequency of the reaction.

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