Select the molecule where free rotation around one or more bonds is not possible. Group of answer choices N2H4 C2Cl4 NH3 C2H6 CCl4

it must have been light, so it can be more mobile, and strong to penetrate skin and flesh, and easy to carve so they can put it on a spear.

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Answer:

Gaps are produced in the light spectra that correspond to wavelengths of absorbed photons.

Explanation:

When electrons in atoms absorb energy, they move from a lower energy level to a higher energy level. With time, they revert to the their original energy state emitting a photon of light of appropriate wavelength.

The absorbed photons do not show up in the spectrum. They appear as dark lines in the spectrum. Hence, the absorption spectrum is the exact inverse of the emission spectrum. The  dark lines in the spectrum indicates that the colors that ought to occupied those points there have been absorbed.

Answer:

c turns back when iodine is added result indicated a chemical reaction

We are given:

Mass of the tablet  = 2.7 grams

Number of moles of Ascorbic acid present in the tablet = 0.0109 moles

Molar mass of Ascorbic acid = 176.12 g/mol

Mass of Ascorbic Acid present in the tablet:

Mass of a given number of moles  = number of moles * molar mass

replacing the variables

Mass = 0.0109 * 176.12

Mass = 1.92 grams (approx)

Mass percent of Ascorbic acid:

Mass% = ([tex]\frac{Mass of Ascorbic Acid}{Mass of the Tablet}[/tex]) * 100

replacing the variables

Mass% = (1.92 / 2.7) * 100

Mass% = 192 / 2.7

Mass% = 71.12 %

Therefore, the tablet has 71.12% Ascorbic Acid by mass

Answer:

71.1

to 3 sig figs

Explanation:

from Khan Academy

Answer:

The nucleon number of given atom = 51

Explanation:

An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

The mass number is also called nucleon number.

The nucleon number of given atom = number of protons + number of neutrons

The nucleon number of given atom = 25 + 26

The nucleon number of given atom = 51

Answer:

Element.

General Formulas and Concepts:

Chemistry

Explanation:

Diatomic Elements are elements that are bonded to themselves. Naturally, these elements are not found alone in nature.

Diatomic Elements:

Hydrogen

Nitrogen

Oxygen

Fluorine

Chlorine

Bromine

Iodine

Since Nitrogen is a diatomic element, we would find Nitrogen in nature as N₂.

Answer:

ocean

Explanation:

Answer:

obsidian

Explanation:

because it is an igneous rock which is smooth

Answer:

B) Obsidian

Explanation:

Since the igneous glass last not very long like you could say obsidian compared to normal ones.

Answer:

Explanation:

Group 1 elements have a single electron (called the valence electron) in there outermost shell. Reactivity of group 1 elements (alkali metals) increases down a group; this is because as one moves down the group, the atomic radius increases thus causing the outermost electron/valence electron to be found further away from the nucleus, which makes it (the electron) to be easily lost due to weaker force of attraction between the single valence electron and the central nucleus.

However, in the case of group 7/halogen elements, as one moves down the group, the atomic radius also increases, but the reactivity reduces. This is because as one moves down the group and the atomic radius increases, the nucleus ability to attract an electron lowers, because of the increased number of electrons that shields against the pull of the nucleus (this is referred to as nuclear shielding). This is the reason fluorine is the most reactive halogen.

Answer:

I think it's Hydrogen is equal to aCalcuim plus b

Answer:

It depends on the identity of the outer atom

Explanation:

We must recall that the polarity of a molecule depends on difference In electronegativity between atoms as well as the shape of the molecule.

When a central atom has no lone pairs and all the groups in the molecule are bonding, the identity and arrangement  of the outer atoms will determine the polarity of the molecule.

A polar molecule is formed by certain types of outer atoms arranged in  certain ways around the periodic table and vice versa.

The identification of the outer atom determines whether the molecule is polar or non-polar. The CH4 compound, for illustration, is a non-polar compound.

There really is no dipole present here because the net dipole moments cancel one another out. As a result, the dipole moment is negligible.

The molecule CH3Cl, for instance, is a polar molecule. There is indeed a dipole force here, and the net polarization isn't zero.

As a result, it exhibits a dipole moment. As a result, the identification of the exterior atom determines whether the molecule is polar or non-polar.

Learn more:

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Answer:

Reactions where chemical bonds are broken, releasing the energy in those bonds, are often exergonic reactions.

Explanation:

Reactions where chemical bonds are broken, releasing the energy in those bonds, are often exergonic reactions. These reactions where chemicals are broken down are called “catabolism” – the destructive part of metabolism. By contrast, reactions where chemical bonds are formed are often endergonic.

Answer:

Solids have a defined shape and volume.

Liquids have a definite volume but can take the shape of a container.

Gas has no definite volume or shape.

Answer:

See Explanation for more details...

Explanation:

Solid: defined form, minimal potential energy, it is not compressible, defined mass.

Liquid: No defined form, has more potential energy than the solids, it is not compressible, defined mass.

Gas: No defined form, high potential energy, it is compressible, defined mass.

Answer:

Approx. 0.1126 mol

Answer:

The correct answer is 0.277 M HCl

Explanation:

NaOH is a strong base and HCl is a strong acid. NaOH reacts with HCl to form a salt (NaCl) and water via a neutralization reaction, as follows:

NaOH + HCl → NaCl + H₂O

At the equivalence point, the moles of NaOH added is equal to the moles of HCl present in the solution to be titrated. Moreover, the moles can be calculated as the product of the concentration of base or acid (Cb or Ca) and the volume (Vb and Va), as follows:

moles NaOH = moles HCl

Cb x Vb         =  Ca x Va

Thus, we calculate the concentration of HCl (Ca), as follows:

Ca = (Cb x Vb)/Va = (0.146 M x 47.5 mL)/(25.0 mL)= 0.277 M

Answer:

Sodium Sulfide

Explanation:

I looked it up

Answer:

The sum would be 69109.4944 ml if that's what you were asking

Answer:

Definetly not they would choke on it

Answer:

no please do not do that

Explanation:

Answer:

3 Ca(s) + 2 Al(NO₃)₃(aq) ⇒ 3 Ca(NO₃)₂(aq) + 2 Al(s)

Explanation:

Let's consider the single displacement reaction between solid calcium metal and aqueous aluminum nitrate. The unbalanced chemical equation is:

Ca(s) + Al(NO₃)₃(aq) ⇒ Ca(NO₃)₂(aq) + Al(s)

We have 3 nitrates on the left and 2 nitrates on the right, so we will multiply Al(NO₃)₃(aq) and Ca(NO₃)₂(aq) by 2 and 3, respectively, to balance them.

Ca(s) + 2 Al(NO₃)₃(aq) ⇒ 3 Ca(NO₃)₂(aq) + Al(s)

Finally, we have to add coefficients before Ca(s) and Al(s) to balance the equation.

3 Ca(s) + 2 Al(NO₃)₃(aq) ⇒ 3 Ca(NO₃)₂(aq) + 2 Al(s)

Answer:

Mass = 13.42 g

Explanation:

Given data:

Molality of potassium chloride solution = 0.721 m

Mass of water = 255 g (255 g /1000 = 0.255 Kg)

Potassium chloride added = ?

Solution:

Molality:

Molality = number of moles of solute/ Kg of solvent

0.721 m = moles / 0.255 Kg

  m = mol/Kg

Moles = 0.721mol/Kg×0.255 Kg

Moles = 0.18 mol

Mass of potassium chloride:

Number of moles = mass/molar mass

0.18 mol = Mass /74.55 g/mol

Mass = 0.18 mol × 74.55 g/mol

Mass = 13.42 g

Answer:

This question is incomplete

Explanation:

This question is incomplete. However, it should be noted that if the containers are compared with an equal average volume, the containers having solids will have larger masses than that containing liquid which will also have a larger mass than that containing gas. This is because solids have there molecules touching each other in compact manner which makes the molecule exert a certain combined force/mass. The molecules of liquid are also close to one another but are not compact like the solids and are hence exerting a lesser force/mass than solids. Gases have free molecules that are far apart and thus are usually the lightest when they occupy the same volume as liquids and solids.

Answer:

the shape of a molecule. The shape of a molecule is determined by the location of the nuclei and its electrons. The electrons and the nuclei settle into positions that minimize repulsion and maximize

Explanation:

hope this helped

Answer:

Mass of water produced= 1.8 g

Explanation:

Given data:

Mass of water produced = ?

Mass of butane = 1.36 g

Mass of oxygen = excess

Solution:

Chemical equation:

2C₄H₁₀ +13 O₂       →   8CO₂ + 10H₂O

Number of moles of butane:

Number of moles = mass/molar mass

Number of moles = 1.36 g/ 58.12 g/mol

Number of moles = 0.02 mol

Now we will compare the moles of butane with water.

                 C₄H₁₀         :        H₂O

                  2              :           10

                 0.02          :         10/2×0.02 = 0.1 mol

Mass of water produced:

Mass = molar mass × molar mass

Mass = 0.1 mol × 18 g/mol

Mass = 1.8 g

Answer:

1.62 L

Explanation:

T= 97+273.15= 370.15

R= 0.08206 atm/mol⋅K

V= 45 L

n= 2.4 mol

P= (n⋅R⋅T)/V

= (2.4 x 0.08206 x 370.15)/(45) = 1.61997 = 1.62

The pressure of the gas is 1.62 atm. This can be calculated by using ideal gas law that gives direct relation between P,V and T

This law states that pressure and volume are directly proportional to the temperature of the gas.

What information do we have?

T= 97+273.15= 370.15 K

R= 0.08206 atm/mol⋅K

V= 45 L

n= 2.4 mol

To find:

P=?

Ideal gas law is given by:

PV=n.R.T

P= (n⋅R⋅T)/V

P= (2.4 x 0.08206 x 370.15)/(45)

P= 1.61997

P= 1.62 atm

Thus, the pressure of the gas is 1.62 atm.

Find more information about Ideal gas law here:

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Answer:26.771%

Percent composition by element

Element Symbol Mass Percent

Xenon Xe 73.229%

Oxygen O 26.771%

Answer:

Germanium

Explanation:

Answer:

Percent error =  4.8%

Explanation:

Given data:

Measured value = 26.1 K

Actual value = 24.9 K

percent error = ?

Solution:

Formula:

Percent error = [ measured value - actual value/ actual value] × 100

Percent error =   [26.1 K - 24.9 K/24.9 K] × 100

Percent error = [ 1.2K /24.9K]× 100

Percent error = 0.048 × 100

Percent error =  4.8%

Answer:

The Bohr model shows that the electrons in atoms are in orbits of differing energy around the nucleus (think of planets orbiting around the sun). ... He said that the energy of an electron is quantized, meaning electrons can have one energy level or another but nothing in between.

Explanation:

Answer:

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