The statements in the table summarize what Johannes Kepler stated in the early 1600s about the motion of planets.
Kepler's Statements
The orbit of a planet around the sun is an ellipse.
As a planet orbits the sun, a line between the planet and the sun sweeps out equal areas during equal periods of time.
There is a mathematical relationship between the time it takes a planet to orbit the sun and the average distance the
planet is from the sun.
Over the last four hundred years, predictions based on his statements have proven true. Which best describes
Kepler's statements?
O hypothesis
O theory
law
explanation

Answer:

sorry to do this but I really needed some points to ask my question from someone else so that's why I am doing so really sorry and thank you for free points

The number of atoms of any element in the given chemical formula is the number that is written on the foot of the symbol of that element. Therefore, the correct option is option C.

Atom is the smallest particle of any matter. Atom combines to form element and element combine to form molecule or compound.

Atom consists of electron, proton and neutron. The total mass of atom is inside the nucleus. Inside the nucleus proton and neutron is there. So calculate mass of an atom, total mass of all protons is added to the total mass of neutron. Electrons revolve around the nucleus.

If an electron of hydrogen gets excited and drops from energy level 2 to level 1 to release  least energy. The level shows the energy levels.

Therefore, the correct option is option C.

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The compound is ethanol

Saponification number = (V × M × F × 56.1) / W

Where:

V = volume of HCl used in the back titration

M = molarity of HCl

F = factor of KOH (which is 1 for pure KOH)

W = weight of the butter sample used in grams

First, we need to calculate the amount of KOH used in the saponification reaction:

0.5131 M KOH = 0.5131 moles KOH / liter

25.00 mL KOH = 0.02500 L KOH

moles KOH used = 0.5131 moles/L × 0.02500 L = 0.0128 moles KOH

Since the saponification reaction is a 1:1 reaction between KOH and the triacylglycerol in the butter sample, the amount of butter used is also 0.0128 moles.

Next, we need to calculate the amount of HCl that reacted with the excess KOH:

0.5000 M HCl = 0.5000 moles HCl / liter

10.26 mL HCl = 0.01026 L HCl

moles HCl used = 0.5000 moles/L × 0.01026 L = 0.00513 moles HCl

Since the reaction between HCl and KOH is also a 1:1 reaction, the moles of KOH that were not used in the saponification reaction is equal to the moles of HCl used in the back titration:

moles KOH not used = moles HCl used = 0.00513 moles HCl

To find the saponification number,

Saponification number = (V × M × F × 56.1) / W

Saponification number = (0.01026 L × 0.5000 moles/L × 1 × 56.1) / 2.085 g

Saponification number = 6.50

Therefore, the saponification number for this sample of butter is 6.50.

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Answer:

If you ran one hour straight west at 5 km/h and then changed direction quickly and ran one hour straight north at 5 km/h, your total displacement would be 7 km NW.

Explanation:

This is because your total change in position would be 5 km to the west and 5 km to the north, resulting in a displacement of 7 km NW.

After running one hour straight west at 5 km/h and then changing direction quickly and running one hour straight north at 5 km/h, the total displacement would be 7 km NW, rounded to the nearest whole number.

The molarity of the solution prepared by dissolving 0.355 moles of NH₃ in enough water to make 3.84 L of solution is 0.092 M

First, we shall list out the given parameters from the question. This is given below:

Molarity of a solution is defined as mole per unit volume i.e

Molarity of solution = mole / volume

Inputting the various parameters, we have:

Molarity of solution = 0.355 / 3.84

Molarity of solution = 0.092 M

Thus, from the above calculation, it is evident that the molarity of the solution is 0.092 M

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Answer:

Chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.

Explanation:

Answer:

a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.

Explanation:

Here's an example. When you burn wood, It releases Carbon dioxide, water vapor, and ashes. It just depends what chemicals you use ^^

The heat absorbed by the water is 25.9 KJ

To solve the question given above, we'll begin by calculating the change in the temperature of the water. This can be obtained as follow:

Initial temperature (T₁) = 25 °C  

Final temperature (T₂) = 32.50 °C

ΔT = 32.50 – 25

Finally, we shall determine the heat absorbed by the water. This can be obtained as follow:

Mass of water = 825.4 g

Change in temperature (ΔT) = 7.5 °C

Specific heat capacity of water = 4.184 J/gºC

Q = 825.4 × 4.184 × 7.5

Q = 25901.052 J

Divide by 1000 to express in KJ

Q = 25901.052 / 1000

Therefore, the heat absorbed by the water is 25.9 KJ.

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Answer:

The disruption of the bonds or attractions occurs during protein hydrolysis which results in the loss for the primacy structure. The peptide bonds is the bond affected in this scenario.

The disruption of the bonds however only exist in the process of denaturation and this results in a change in the confirmation which could be secondary, tertiary, and quaternary structural related. And example of the bonds affected include salt bridges, disulfide bridges, hydrogen bonds etc.

Answer:

C

Explanation:

because its the answer

Answer:

acids

Explanation:

acids because if the rain comes from cloud is acid it can be weathered or if the water is slightly acidic

The complete reaction, according to the law of conservation of mass is:

XX + YY → 2XY

The Law of Conservation is a fundamental principle in chemistry and physics. It states that in a closed system, mass cannot be created or destroyed during a chemical reaction or a physical change. The total mass of the substances involved before the reaction or change must equal the total mass of the substances after the reaction or change.

This principle is based on the understanding that atoms are not created or destroyed, but they can combine or separate to form different substances.

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Answer:

yes

Explanation:

Water contains molecular bonds and because it is  made from more than one element and they are oxygen and hydrogen.

ozone would be considered a molecule because it has three oxygen atoms formed together and is 21% of the gases found on earth

The pressure (in mmHg) of O₂, given that CO₂ has a pressure of 560 torr is 222.8 mmHg

We'll begin by converting 1.03 atm to torr. This can be obtained as follow:

1 atm = 760 torr

Therefore,

1.03 atm = (1.03 atm × 760 torr) / 1 atm

1.03 atm = 782.8 torr

Next, we shall determine the pressure of O₂. This can e obtained as follow:

Total pressure = pressure of CO₂ + pressure of O₂

782.8 = 560 + pressure of O₂

Collect like terms

Pressure of O₂ = 782.8 - 560

Pressure of O₂ = 222.8 torr

Finally, we shall convert 222.8 torr to mmHg. This is illustrated below

Recall

760 torr = 760 mmHg

Therefore,

222.8 torr = 222.8 mmHg

Thus, we can conclude that the pressure of O₂ is 222.8 mmHg

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Answer:

Positive charge.

Explanation:

Hello!

In this case, since elements belonging to groups 1A, 2A and 3A are mostly metals, we infer they have the capacity to lose electrons and therefore they become positively charged.

Some examples may be:

\(Na^+\\\\H^+\\\\Ca^{2+}\\\\Al^{3+}\\\\Sr^{2+}\)

Best regards!

Answer:

2.4 grams of ClF3

Explanation:

First let us determine the moles of Cl2 and F2,

Cl2 = (  ( 337 )( 2.05 L ) / ( 0.082 )( 298 K ) ) * ( 1 atm / 780 ),

Cl2 = ( 690 / 24.436 ) * ( 1 / 780 ),

Cl2 = ( About ) 0.036 moles of Cl2

_________________________________________________

F2 = ( ( 729 )( 2 L ) / ( 0.082 )( 298 K ) ) * ( 1 atm / 780 ),

F2 = ( 1458 / 24.436 ) * ( 1 / 780 )

F2 = ( About ) 0.078 moles of F2

Now let us identify the limiting reactant, considering the ratio between ClF3 and Cl2 / F2. In this case F2 is the limiting reactant, as it forms a smaller molar ratio;

The theoretic yield is thus performed with the limiting reactant F2,

0.078 * ( 2 / 3 ) * ( 92.45 / 2 ) = ( About ) 2.4 grams of ClF3

Answer:

B

Explanation:

A is not the answer.  Although the statement is accurate in regards to gases, it does not explain why liquids and gases can flow.

B is the answer.  Solids are in fixed structures.  When you apply heat or pressure, these structures are broken apart and allowed to move freely.

C is not the answer.  This is inaccurate.  Changing the phase of a substance does not change the size of the particle.

D is not the answer.  The opposite of this statement is true.  The attractive forces between particles in a solid allow the substance to hold its structure.  When you apply heat or pressure, the attractive forces are overpowered and the structure is broken.

Answer:

B)  The structure of liquids and gases is not fixed, so particles can slide past each other.

Explanation:

they are correct took the test

The statement that describes the appearance of a temperature-vs.-time graph : c)Horizontal lines where temperature is constant during phase changes connect upward-sloping lines where temperature increases.

As the temperature is constant during phase change (melting or boiling), so the graph is a horizontal line. A temperature-energy graph shows energy and temperature changes as water turns from solid, ice, to a liquid, water,  to a gas, water vapor.

Temperature increases when a single phase (solid, liquid, or gas) is heated, so graph for these changes has upward slope.

A is wrong as horizontal line shows a constant temperature. B is wrong as there are no vertical lines in heating curve. D is not correct as horizontal line does correspond to an increase in temperature.

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Answer:

The molecular formula for A is C2H4(NO3)2

The molecular formula for B is C2H6O2

Explanation:

I linked an image that will show the work.

Answer:

shale and siltstone

Explanation:

The Triceratops dinosaur fossils are approximately 70 million years old, because they are found in shale and siltstone that contain volcanic ash radiometrically dated at 70 million years.

Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, in shale and siltstone, Scientists would most commonly find a fossil of triceratops.

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.

Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.

So as we saw that matter has some mass so mass can be measured in gram only. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter.

Scientists would most commonly find a fossil of triceratops in shale and siltstone that contain volcanic ash radiometrically dated at 70 million years.

Therefore, in shale and siltstone, Scientists would most commonly find a fossil of triceratops.

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The number of molecules in the permanganate is 4.8 * 10^22 molecules

We know that if we are to obtain the number of molecules form the number of the moles of the substances then as a matter of necessity we would have to turn to the Avogadro's law and that is what we are going to do here.

We have that;

If 1 mole contains about 6.02 * 10^23 molecules

0.08 moles would contain 0.08 * 6.02 * 10^23/ 1

= 4.8 * 10^22 molecules

Hence, we have about 4.8 * 10^22 molecules in the permanganate

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Answer:

B

Explanation:

Answer:

xylem

Explanation:

The pH of the buffer solutions as determined using the Henderson–Hasselbalch equation are:

The pH of a buffer is determined using the Henderson–Hasselbalch equation shown below:

A. Volume of acetic acid = 5 mL; Volume of sodium acetate = 5 mL; pka of acetic acid = 4.75

The solutions of acetic acid and sodium acetate are equimolar;

pH = 4.75 + log(1)

pH = 4.75

B. Volume of acetic acid = 5 ml; Volume of sodium acetate = 1 mL; pka of acetic acid = 4.75

The solutions of acetic acid and sodium acetate are equimolar;

pH = 4.75 + log(1/5)

pH = 4.05

C. Volume of acetic acid = 10 ml; Volume of sodium acetate = 1 mL; pka of acetic acid = 4.75

The solutions of acetic acid and sodium acetate are equimolar;

pH = 4.75 + log(1/10)

pH = 3.75

D. Volume of acetic acid = 1 ml; Volume of sodium acetate = 10 mL; pka of acetic acid = 4.75

The solutions of acetic acid and sodium acetate are equimolar;

pH = 4.75 + log(10/1)

pH = 5.75

E. Volume of acetic acid = 1 ml; Volume of sodium acetate = 5 mL; pka of acetic acid = 4.75

The solutions of acetic acid and sodium acetate are equimolar;

pH = 4.75 + log(5/1)

pH = 5.45

In conclusion, the pH of the buffer solutions are determined using the Henderson–Hasselbalch equation.

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Answer: 4

Explanation: because the zero doesn't count

Answer:

C

Explanation:

Answer:

A.)

Explanation:

The new volume assuming that the pressure and temperature remain constant is 0.46 L and the correct option is option 1.

The Ideal gas law is the equation of state of a hypothetical ideal gas. It is a good approximation to the behaviour of many gases under many conditions, although it has several limitations. The ideal gas equation can be written as-

                        PV = nRT

where,

P = Pressure

V = Volume

T = Temperature

n = number of moles

Given,

Initial volume = 1.5 L

Initial moles = 7.5 moles.

Moles remaining = 2.3 moles

\(\frac{n_{1} }{V_{1} } = \frac{n_{2} }{V_{2} }\)

\(\frac{7.5}{1.5 } = \frac{2.3}{V_{2} } }\)

V₂ = 0.46 L

Thus, the ideal selection is option 1.

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Answer:

19 °C

Explanation:

Step 1: Given and required data

Step 2: Calculate the temperature change (ΔT)

We will use the following expression.

Q = c × m × ΔT

ΔT = Q/c × m

ΔT = 300.2 J/(0.790 J/g.°C) × 20 g = 19 °C