Which statement below best describes kinetic energy?

A :Kinetic energy is energy that exists due to position
B: Kinetic energy is energy that exists because something is moving
C: Kinetic energy is energy from an object's chemical makeup.
D: Kinetic energy is energy derived from an object's molecular structure.

Answer:

B. Zinc burns in the air.

Explanation:

A chemical property of an element is known as the property of that specific element that is apparent or visible when the element has gone through a chemical reaction with other substances or elements under investigation.

In this case, the correct answer is option B which is " Zinc burns in the air" because it shows zinc to react chemically with air which then changes its properties.

The others are just physical properties of zinc

Answer:

could you explain your question more

Explanation:

Diagram represents an element that is likely to form covalent bonds is a purple circle with 3 concentric circles around it

Covalent bond means it consist of mutual sharing of one or more pair of electron between two atom and covalent bond diagram consist of in the middle the small circle which is purple color and three concentric circles around the purple circle and covalent bond diagram show the electron dot formulas and they often reffred to as lewis structure and are little different than electron dot formula used to represent the ionic bond

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Answer:

D 4,3,2

Explanation:

4 Co + 3 O2 ----> 2 Co2O3

At pOH value  of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)

In this question we will apply the formula

      pH +pOH = 14 . . . . . . . . . . . . .(1)

where pH = concentration of [\(H^{+}\) ] ion

pOH = concentration of [\(OH^{-}\) ] ion

As per the question

pOH =6.0

Putting the value of pOH in equation (1) we get the value of pH

              pH + 6.0 =14

             pH = 14 -6.0

             pH  = 8.0

 The value of pH if the pOH value is 6.0 is 8.0

To find the concentration of \(H^{+}\) ion we will use the following formula

This is calculated by the formula

                                 [\(H^{+}\)} = \(10^{-pH}\)

where we will write the values of pH

Hence the concentration of [\(H^{+}\)} ion is \(10^{-8}\)

Therefore at  pOH of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)

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The complete question is -

What is the pH value and concentration of [\(H^{+}\) ] ion of the following if the pOH value of the solution is 6.0 ?

D.

Light contains energy, Snails contain mass, and so does iron.

Answer:

24.31 g/mol.

Explanation:

moles =mass/molar mass

n=w/m

To form ionic bonds, atoms transfer electrons. Consider sodium as: It is permanent in its anionic form and has one valence electron.

Ionic connections are created when specific electrons are fully transferred from one atom to another. When atoms lose one or more electrons, cations are produced (positively charged ions). When an atom receives one or more electrons, it produces an anion (negatively charged ion) .

Ionic bonding is demonstrated via the synthesis of sodium fluoride (NaF) from sodium and fluorine atoms. The sodium atom's lone valence electron is accepted in this process by a fluorine atom that has just enough area to accommodate it. Ions or charged molecules are referred to as "ionic" compounds. Ionic bonds are the interaction between ions with different charges. If we glance at the adjective, ionic, we can tell that the subject is science. Ionic bonds hold two or more atoms together to form ionic molecules.

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The density of air at exactly 35°C and 1.00 atm (assuming that air is 80.0 percent N2 and 20.0 percent O2 is 1.1 g/L.

Density is described as the substance's mass per unit of volume.

Density of a gas d is given as  = PM/ RT

where d ⟶ Density of the gas

P ⟶ Pressure of the gas

M⟶ Molar Mass of the gas

R⟶ Universal Gas Constant

T⟶ Absolute temperature

we have that the pressure of air is P=1.00 atm, and the temperature is T=35∘C=308K.  The molar mass of air can be assumed to be the weighted average of its components.

The air is 80% nitrogen and 20% oxygen, so 1 mole of air will contain 0.80 moles of nitrogen and 0.20 moles of oxygen. So, the molar mass of air will be:

Molar Mass of air= 0.80 MN2 + 0.20MO2 = 0.80 (28.00g/mol) + 0.20 (32.00g/mol) = 28.8 g/mol

Substituting the values into the equation of d = PM/ RT, we have

density = 1.1g/L

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-1113.5kJ is the theoretical enthalpy of combustion.

What makes energy different from enthalpy?

The entire amount of heat energy that is either absorbed or released in a thermodynamic system is measured by enthalpy. Internal energy denotes all of the potential or moving energy present in a thermodynamic system.

Enthalpy of combustion is the term used to describe the change in a system's enthalpy that occurs when one mole of a substance fully burns in oxygen or air at a specific temperature.

C₂H5OH()+302(g) → 2CO2(g) + 3H₂O(1)

Reactants:

5 C-H : 5*412

1 C-C : 348

1 C-O: 358

3 O=O: 3* 496

1 O-H: 463

Products:

2*2 C=O : 4*743

2*3 O-H: 6*463

Enthalpy of Vaporization (kJ mol-¹) for :

Ethanol 42.5

Water 41​

Enthalpy of combustion : (5*412 + 348 + 358 + 3* 496 + 463 + 42.5) - ( 3*41 + 4*743 + 6*463)    

                                        : -1113.5kJ

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Answer:

A process that involves rearrangement

Explanation:

A chemical reaction is the process that involves rearrangement of the molecular or ironic structure of a substance, as a distinct from a change in physical form or a nuclear reaction.

Answer:

Explanation:

Chemistry

The chemical reaction H2(g) + ½ O2(g) → H2O(l) describes the formation of water from its elements.

The reaction between iron and sulfur to form iron(II) sulfide is another chemical reaction, represented by the chemical equation:

8 Fe + S8 → 8 FeS

Answer:

linear ,trigonal planar,tethradral geometry

Answer:

linear

trigonal planar

tethradral geometry

Explanation:

edge

The grams of AgCl are generated when 85 g of BaCl₂ reacts is 10.86 g.

The balanced equation is given as :

BaCl₂    +    2AgNO₃   ----->   2AgCl   +   Ba(NO₃)₂

the mass of the BaCl₂ = 85 g

molar mass of BaCl₂  = 208.23 g/mol

moles of BaCl₂  = mass / molar mass

                          = 85 / 208.23

                          = 0.408 mol

1 mole of BaCl₂  produce 2 moles of AgCl

0.408 moles of BaCl₂  = 2 × 0.408

                                      = 0.816 mol of AgCl

moles of AgCl = 0.816 mol

mass of AgCl = moles × molar mass

                      = 0.816 g × 143.32 g/mol

                      = 10.86 g

Thus,  The grams of AgCl are generated when 85 g of BaCl₂ reacts is 10.86 g.

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Answer:

you travel 100 miles in 5 gallon of gas

20 miles in 1 gallon of gas

Answer:

E

Explanation:

We want to determine the amount of methanol (CH₃OH) needed to prepare 175 mL of a 1.00 M CH₃OH solution.

First, determine the amount of moles of CH₃OH needed. Recalled that molarity is simply moles per liter volume (mol / L):

\(\displaystyle\begin{aligned} & 175\text{ mL} \cdot 1.00\text{ M CH$_3$OH} \\ \\ = & 175\text{ mL} \cdot \frac{1.00\text{ mol CH$_3$OH}}{1\text{ L}} \cdot \frac{1 \text{ L}}{1000\text{ mL}} = 0.175\text{ mol CH$_3$OH} \end{aligned}\)

Convert from moles of CH₃OH to grams:

\(\displaystyle 0.175\text{ mol CH$_3$OH} \cdot \frac{32.05\text{ g CH$_3$OH}}{1\text{ mol CH$_3$OH}} = 5.61\text{ g CH$_3$OH}\)

In conclusion, the answer is E.

A methane molecule (CH4) is considered symmetrical because it possesses a symmetric structure and exhibits symmetry operations.

Symmetry refers to a balanced arrangement of elements that can be divided into equal parts by a plane, axis, or center. In the case of methane, it exhibits several symmetrical characteristics.

Firstly, methane has a tetrahedral molecular geometry, with the carbon atom at the center and four hydrogen atoms positioned around it. This geometry ensures that the molecule is symmetrical in terms of its spatial arrangement.

Each hydrogen atom is located at one of the vertices of the tetrahedron, forming equal angles and distances with respect to the central carbon atom. This symmetry is maintained regardless of the orientation of the molecule.

Additionally, methane possesses rotational symmetry. It can be rotated around any of the carbon-hydrogen bonds, and the molecule will retain its overall appearance.

The symmetry of methane arises from its molecular structure and the equal distribution of electron density around the central carbon atom. The four hydrogen atoms are bonded to the carbon through sigma bonds, which have a cylindrical symmetry. This balanced arrangement of the atoms contributes to the overall symmetry of the molecule.

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Answer:

Any Group 2A element (Be, Mg, Ca, Sr, Ba, Ra)

Explanation:

According to the Octet Rule, Sulfur would want to gain two electrons in its outermost shell to achieve an octet (8 total electrons).  The elements that could accomplish this in a one-to-one ratio would be Group 2A on the periodic table (alkaline earth metals).

There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, alkaline earth metals are the suitable elements.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.

The compound that is ionic in nature can be dissociated very easily in water. Since ionic compounds are polar in nature, they readily dissolve in water.  The elements that could accomplish this in a one-to-one ratio would be  alkaline earth metals

Therefore, alkaline earth metals are the suitable elements.

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The proximity of unsaturated groups (C=C, C=O, aromatic) and electronegative atoms (O, N, halogen) has an impact on the proton NMR chemical shift. Electronegative groups shift to the left (down field; ppm rise).

The chemical shift in nuclear magnetic resonance (NMR) spectroscopy refers to the atomic nucleus' resonant frequency in relation to a standard in a magnetic field. The location and quantity of chemical changes frequently serve as diagnostic indicators of molecular structure.

You take into account the chemically non-equivalent proton(s) one at a time while making chemical shift predictions. Find the origin of each proton or proton pair that is not chemically comparable. Whether the proton(s) is/are linked to a methyl, methene, or methine determines the beginning point.

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Metals and non-metals interact chemically to produce ionic bonds. If a metal gains enough electrons to create a full valence shell and becomes positively charged, it is by definition considered to be relatively stable. Similar to how a non-metal solid gains stability, a non-metal solid gains electrons to finish off its valence shell and acquire a negative charge.

Metals and non-metals interact chemically to produce ionic bonds. If a metal gains enough electrons to create a full valence shell and becomes positively charged, it is by definition considered to be relatively stable. Similar to how a non-metal becomes stable, a non-metal can do so by gaining electrons to finish out its valence shell and become negatively charged.

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Answer:

The answer is 76.36 torr

Explanation:

using P1V1=P2V2

Since temperature did not change

P2=P1V1/V2

P2=262×21/75

P2=73.36 torr

steam takes up the largest volume but  surprisingly as ice has larger volume than liquid.

In Water the  molecules are attracted to each other while at low temperature these molecules are held together in a rigid structure called as ice.

When temperature increases the molecules gains more energy which enables them to escape the lattice state and converted into water form, flow.  

At the highest temperature these molecules  gain huge amount of energy in which they can easily overcome the inter-molecular attraction that is gaseous state.

In gaseous state the molecules move freely.

The intermolecular forces in solid state of water are very strong while in liquid state it is moderate and in gaseous state  it is very weak.

The chemical composition of water in all three states can not change like physical state change.

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Answer:

Osmium

Explanation:

When the moving car brakes to the stop the kinetic energy of car will be converted to the heat energy.

The mechanical brake will be applies to the friction force and it convert the kinetic energy of the car into the thermal energy that which then dissipates on atmosphere. The process of the braking will follow the principle of the conservation of the energy.

The conservation of the energy is the principle, that is expressed in its the most general form, and it is the first law of the thermodynamics. The first law of thermodynamics explains that "the energy of the universe remains the same."

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This question is incomplete, the complete question is :

A car in motion has kinetic energy. A moving car is suddenly stopped. Why does the car stop? Where did the energy go?

The density of the iron pyrite cube is 1.343 g/cm³.

Given,

Side of iron pyrite cube = 0.31 cm

Mass of iron pyrite = 0.040 g

The volume of iron pyrite cube = s³ cm³

Or, volume = 0.029791 cm³

We have to find the density of the sample.

Density is defined as the mass per unit volume. Or, it is the ratio of mass to the volume of the substance.

Using the formula for density, we get,

Density = mass/volume

Or, density = 0.40/0.029791

Or, density = 1.343 g/cm³

Hence, the density of the iron pyrite cube is 1.343 g/cm³.

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Answer:

ok, here is your answer

Explanation:

AI-generated answer

To find the mass of oxygen that reacted, we need to use the Law of Conservation of Mass, which states that in a chemical reaction, the mass of the reactants equals the mass of the products.

First, we need to find the number of moles of hydrogen that reacted:

Molar mass of hydrogen (H₂) = 2.016 g/mol

Number of moles of H₂ = mass/molar mass = 46.2 g/2.016 g/mol = 22.92 mol

Next, we need to use the balanced chemical equation to find the number of moles of water produced:

hydrogen + oxygen → water

2H₂ + O₂ → 2H₂O

From the equation, we can see that for every 2 moles of H₂, 1 mole of O₂ is required to produce 2 moles of H₂O. Therefore, the number of moles of O₂ required to produce 22.92 moles of H₂O is:

Number of moles of O₂ = 1/2 x 22.92 mol = 11.46 mol

Finally, we can find the mass of oxygen that reacted by using its molar mass:

Molar mass of oxygen (O₂) = 32.00 g/mol

Mass of oxygen = number of moles x molar mass = 11.46 mol x 32.00 g/mol = 366.72 g

Therefore, the mass of oxygen that reacted is 366.72 g.

Answer: Where is the folowing?

Explanation:

Answer: B

Explanation: Formaldehyde molecules do not form an extended structure and can freely move past each other

2p: 4

3d: 2

2s: 1

4f: 5

1s: 3

Explanation: got it all right

Answer:

1: n = 2, l = 0   2p: 4

2: n = 3, l = 2  3d: 2

3: n = 1, l = 0   2s: 1

4: n = 2, l = 1   4f: 5

5: n = 4, l = 3   1s:  3