7. Which object would be the least dense in a tub of
water?
A. Golf ball
B. Glass marble
C. Rubber ball
D. Beach ball

Answer:

This reaction has infinite ways to be balanced

Explanation:

To balance this equation we can use the algebraic method:

N2O4(g) + CO → NO(g) + CO2(g)+NO2(g)

Where we write each molecule as a letter:

A + B → C + D + E

Then, we write the equations according the number of atoms of each molecule. That is:

Oxygen → 4A + B = C + 2D + 2E (1)

Nitrogen → 2A = C + E (2)

Carbon → B = D (3)

Then, we have to give 1 arbitral number for a letter. For example:

B = 1; D = 1

(1) 4A + 1 = C + 2 + 2E

4A = C + 2E + 1

2A = C + E (2) Twice (2):

4A = 2C + 2E

Subtracting (1) in (2)

C + 2E + 1 = 2C + 2E

C + 1 = 2C

1 = C

Si 1 = C:

4A + 1 = 1 + 2 + 2E

4A = 2 + 2E (1)

y:

2A = 1 + E (2)

Twice:

4A = 2 + 2E

As (1) and (2) are the same equation:

For example:

N2O4(g) + CO → NO(g) + CO2(g)+NO2(g)

Answer:

Ionization Energy = 9 eV

Explanation:

If we apply the law of conservation of energy to the given situation, we will get the following equation:

[tex]Energy\ of\ Photon = Ionization\ Energy + Kinetic\ Energy\ of\ Electron\\[/tex]

where,

Energy of Photon = 10 eV

Ionization Energy = ?

Kinetic Energy of Electrons = 1 eV

Therefore,

[tex]10\ eV = Ionization\ Energy + 1\ eV\\Ionization\ Energy = 10\ eV - 1\ eV[/tex]

Ionization Energy = 9 eV

Answer:

26.9L of SO2

Explanation:

The reaction between Sulphur and oxygen is as follows:

[tex]S_2 + 2O_2 \to 2SO_2[/tex]

This implies that:

2 moles of oxygen reacts with 1 mole of sulphur to produce 2 moles of SO₂

2 moles of oxygen also yields 2 moles of SO₂

The number of moles of oxygen given is determined as:

[tex]= 26.9 \ L \ of \ O _2 \times (\dfrac{1 \ mol \ of O_2 }{22.4 \ L}) \\\\ = 1.20 \ mol \ of \ O_2[/tex]

The number of moles of SO₂ by using the ratio is:

[tex]= 1.20 \ mol \ of \ O_2 \times (\dfrac{1 \ mol \ of \ SO_2 }{1 \ mol \ O_2}) \\ \\ = 1.20 \ mol \ of SO_2[/tex]

Finally, the volume by applying the new moles is computed as:

[tex]= 1.20 \ moles \ of \ O_2 \times ( \dfrac{1 \ mo \ of \ SO_2}{1 \ mol \ of O_2}) \times ( \dfrac{22.4 }{1 \ mol }) \\ \\ = 26.9 \ L \ of \ SO_2[/tex]

Answer:

because dark colours like black attract light (sun) and heat. light colors reflect more light, (it absorbs less energy and heat from the sun)

Answer:

Because Black color absorbs light better than light-colored.

for example have you ever seen the black car on the road if you touch it very hotter than white car

1. White is the most reflective color. Does not absorb heat like black Make the house not hot.

2. White has the least radiation exposure. Therefore, during the winter night, it will help retain heat for a while. 3. Because white absorbs light as little as possible. Causing the pigment to deteriorate slowly Unlike black that absorbs light well. Causing the color to deteriorate and fade quickly until noticeable

4. If the house next to you is painted white during the day, it will help reflect light into the house.

Why that black color absorbs heat? Even though it abosrbs the light? It comes from the principle that (Substance or material) Black is what absorbs (absorbs) light in every technology.

It absorbs all widths of light, including infrared light. (The infrared itself is hot.)

Black repels self-heating the most because of all colors of light. But there is justice.

Answer:

Electrical force can pull and push

Explanation:

Answer:

The glass ball was moved into the dark, and there is more carbon in the water.

Explanation:

Reza has a glass ball filled with water that contains tiny plants and shrimp that eat those plants. No material can get in or out, but light can get through the glass when it is placed in sunlight.

The number of energy storage molecules in the plants and shrimp started out high, but then the glass ball was moved, and the number of energy storage molecules decreased. Was the glass ball moved into the light or into the dark? What happened to the amount of carbon in the water?

The glass ball was moved into the dark and the amount of carbon increased in water as there is no photosynthesis taking place.

It is defined as a process by which plants and other photosynthetic organisms convert the light energy in to chemical energy  through the process of cellular respiration.

Some of the energy which is converted  is stored in molecules of carbohydrates like sugar and starches  which are made up of from carbon dioxide and water . Photosynthetic organisms which can perform photosynthesis  are algae and cyanobacteria. Photosynthesis is largely responsible for producing and maintaining the content of oxygen in earth's atmosphere.

The process begins with proteins absorbing light energy  which are called reaction centers and contain a green pigment which is called chlorophyll . In plants ,these pigments are present inside organelles called chloroplasts while in bacteria they are present in plasma membrane.

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Answer:

a. True

Explanation:

The gases that we study are governed by different laws of physics. Gases behaves according to some given set of laws like the Universal gas laws, Boyles law, Charles law, Gay Lussac's law and many more.

But we do not see a definite pattern or rule when we study solids or liquids. The behavior of the solids and liquids are not described by the set of laws which are applied regardless of the identity of the substance.

answerA) 100 mL

Explanation:

At constant temperature and number of moles, Using Boyle's law  

Given ,  

V₁ = 200 mL

V₂ = ?

P₁ = 60 kPa

P₂ = 120 kPa

The new volume of the gas is 100mL

Boyle's law is use to calculate the volume of a gas in relation with its pressure. The Boyle's law equation is as follows:

P1V1 = P2V2

Where;

P1 = initial pressure of the gas (torr)

P2 = final pressure of the gas (torr)

V1 = initial volume of the gas (mL)

V2 = final volume of the gas (mL)

According to the information of this question, the pressure on 200mL of a gas changed from 380 torr to 760 torr. Hence;

V1 = 200mL

V2 = ?

P1 = 380torr

P2 = 760torr

Using P1V1 = P2V2

V2 = P1V1/P2

V2 = (380 × 200) ÷ 760

V2 = 76000 ÷ 760

V2 = 100mL

Hence, the new volume of the gas is 100mL

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Transition metal ions tends to absorb light in the visible range.

Transition metal is defined as an element having a d subshell that is partially filled with electrons, or an element that has the ability to form stable cations with an incompletely filled d orbital.

The transition metals are located towards the middle of the periodic table between the highly reactive metals and the noble gases.

They are the only elements that may use electrons in the next to highest—as well as the highest—energy level as valence electrons.

Transition metals are unusual in having very similar properties even with different numbers of valence electrons.

Therefore, Transition metal ions tends to absorb light in the visible range.

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Answer:

5.450 mol Si₃N₄

Explanation:

Step 1: Write the balanced equation

3 Si + 2 N₂ ⇒ Si₃N₄

Step 2: Establish the theoretical molar ratio between the reactants

The theoretical molar ratio of Si to N₂ is 3:2 = 1.5:1.

Step 3: Establish the experimental molar ratio between the reactants

The experimental molar ratio of Si to N₂ is 16.35:11.26 = 1.45:1. Comparing both molar ratios, we can see that Si is the limiting reactant.

Step 4: Calculate the moles of Si₃N₄ produced from 16.35 moles of Si

The molar ratio of Si to Si₃N₄ is 3:1.

16.35 mol Si × 1 mol Si₃N₄/3 mol Si = 5.450 mol Si₃N₄

Answer:

A) –7.8944×10-13 J/atom

Explanation:

Mass defect of a radionuclide (m)

[tex]=-8.7839[/tex]×[tex]10^{-30} kg[/tex]

Formula for binding energy

[tex]E=mc^{2}[/tex]

   [tex]=(-8.7839x10^{-30} kg)(3x10^{8} m/s)^{2}[/tex]

[tex]E=-7.8944x10^{-13} J/atom[/tex]

If the mass defect for a radionuclide is – 8.7839 × 10⁻³° kg, the binding energy per atom will be –7.8944 × 10⁻¹³  J/atom. The correct option is A.

A radionuclide is an unstable nuclide because it contains so much charge. The excess energy is used by the gamma radiation by the nucleus, the electron uses energy to move to another orbital.

Radionuclides are particles that are used to scanning or monitor the radioactive chemicals that are in the body due to swallowing or inhaling.

The binding energy per atom can be calculated by the formula

The mass of defect of a radionuclide (m) is – 8.7839 × 10⁻³° kg

E = mc²

E =  – 8.7839 × 10⁻³° x 3 x 10⁸ m/s

E = –7.8944 × 10⁻¹³  J/atom.

Thus, the correct option is A. –7.8944×10-13 J/atom.

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Answer:

Oxygen cycle, along with the carbon cycle and nitrogen cycle plays an essential role in the existence of life on the earth. The oxygen cycle is a biological process which helps in maintaining the oxygen level by moving through three main spheres of the earth which are:

Explanation:

The atmosphere is the layer of gases presents above the earth’s surface. The sum of Earth’s ecosystems makes a biosphere. Lithosphere is the solid outer section along with the earth’s crust and it is the largest reservoir of oxygen.

Answer:

Oxygen cycle, circulation of oxygen in various forms through nature. ... Free in the air and dissolved in water, oxygen is second only to nitrogen in abundance among uncombined elements in the atmosphere. Plants and animals use oxygen to respire and return it to the air and water as carbon dioxide (CO2).

Explanation:

Answer:

92.344mL

Explanation:

acording to boyle's law that PV=constant then P1V1=P2V2

Answer:

5. C

6. B

Explanation:

sana nakatulong

Archaebacteria do not have a nucleus and the probability of their presence on skin is very low.

They are divided into thermoacidophiles, halophiles, and methanogens.

Archaeal 16 S rRNA genes were found on the skin of every human subject, contributing for up to 4.23 percent of the recovered prokaryotic microbiome.

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Solar energy:-

In this way the energy generated through sun light with the help of solar panels and to be used in many works.

Wind energy:-

This is generated by moving turbines with windmills .It is used to create electric energy

Answer: The volume is 8.94 L.

Explanation:

Given: no. of moles = 0.350 mol,   Pressure = 0.980 atm

Temperature = [tex]32^{o}C = (32 + 273) K = 305 K[/tex]

Formula used to calculate the volume is as follows.

PV = nRT

where,

P = pressure

V = volume

n = number of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into above formula as follows.

[tex]PV = nRT\\0.980 atm \times V = 0.350 mol \times 0.0821 L atm/mol K \times 305 K\\V = 8.94 L[/tex]

Thus, we can conclude that the volume is 8.94 L.

Answer: Does the animal prey on other animals? Is the animal a carnivore?

Answer:

Creo que es D pero no tan segura

Explanation:

Answer:

[tex]P_{H_2}=727mmHg[/tex]

Explanation:

Hello there!

In this case, according to the given data, it is possible to infer that the gas mixture lies on the 15.0 cm-high column of water, so that the total pressure or atmospheric pressure is given by:

[tex]P_{atm}=P_{water}+P_{H_2}[/tex]

Thus, since the atmospheric pressure is 745 mmHg and the vapor pressure of water is 18 mmHg, the pressure of hydrogen turns out to be:

[tex]P_{H_2}=P_{atm}-P_{water}\\\\P_{H_2}=745mmHg-18mmHg\\\\P_{H_2}=727mmHg[/tex]

Best regards!

Answer:

See explanation

Explanation:

Hello there!

In this case, since the the concentrations are not given, and not even the Ksp, we can solve this problem by setting up the chemical equation, the equilibrium constant expression and the ICE table only:

[tex]AgCl(s)\rightleftharpoons Ag^+(aq)+Cl^-(aq)[/tex]

Next, the equilibrium expression according to the produced aqueous species as the solid silver chloride is not involved in there:

[tex]Ksp=[Ag^+][Cl^-][/tex]

And therefore, the ICE table, in which x stands for the molar solubility of the silver chloride:

       [tex]\ \ \ \ \ \ \ \ \ \ \ \ \ \ AgCl(s)\rightleftharpoons Ag^+(aq)+Cl^-(aq)[/tex]

I          -                   0             0

C        -                   +x           +x

E        -                    x             x

Which leads to the following modified equilibrium expression:

[tex]Ksp=x^2[/tex]

Unfortunately, values were not given, and they cannot be arbitrarily assigned or assumed.

Regards!

Answer:

dog 2 because it is running 1m faster a second than dog 1. Dog 2 can run 1 meter farther in a second than the other dog.

Here's the solution,

we know,

potential energy = mgh

where,

So,

=》

[tex]p.e = 0.5 \times 9.8 \times 0.8[/tex]

=》

[tex]p.e = 3.92 \: \: joules[/tex]

Answer: c????????

Explanation:

Answer:

refer to below

Explanation:

- read your textbook! especially the topics that are most confusing

- as you read, make sure to take notes/make an outline. write the words from the text in your own words. In chem, the textbook explanations are usually very detailed, so putting it in your own words will help you remember and understand what you write.

- make sure you really understand the concepts. don't just memorize what you read.

- draw diagrams and structures. seeing how things are structured will help you visualize what you learn

- ask questions to your teacher. if there is anything confusing, make sure to refer to your teacher as they will hopefully be able to explain it so  it won't be confusing

These tips have helped me pass chem with an A. Hope all of this helped!

Answer:

Explanation:

Study material, ask for help, read textbook and do practice problems, get a tutor, beg your teacher for marks,

Answer:

1.0 moles of N2

Explanation:

since

1.0 × avogadro's no# = same answer for SO2 and N2

avogadro's no#= 6.02× 10²³

The number of molecules in 1.0 mole of SO₂ is the same as the number of molecules in (3) 0.25 mole of NO₂.

Option (3) is correct.

Avogadro's number, approximately 6.022 x 10²³, represents the number of molecules or atoms in one mole of any substance. In this case, 1.0 mole of SO₂ contains the same number of molecules as any other substance with 1.0 mole, such as 1.0 mole of N₂ or 2.0 moles of Ne.

However, when comparing different moles of substances, we can use the concept of stoichiometry and molar ratios to determine the number of molecules. Given that 1 mole of SO₂ is equivalent to 1 mole of NO₂, 0.25 mole of NO₂ would also contain the same number of molecules as 1 mole of SO₂. Therefore, the number of molecules in 1.0 mole of SO₂ is the same as the number of molecules in 0.25 mole of NO₂.

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According  to law of conservation of energy, the statement which is false is kinetic energy is the energy associated with its position or composition.

According to law of conservation of energy, it is evident that energy is neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.

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Answer:

[tex]n_{O_2}=0.866molSO_2\\\\n_{SO_2}=0.577molSO_2[/tex]

Explanation:

Hello there!

In this case, according to the given balanced chemical reaction by which ZnS reacts with O2, it is possible to calculate the moles of the latter that are consumed, not produced, according the 2:3 mole ratio between them and the following stoichiometric set up:

[tex]n_{O_2}=56.25gZnS*\frac{1molZnS}{97.47gZnS}*\frac{3molO_2}{2molZnS} \\\\n_{O_2}=0.866molO_2[/tex]

But also, we can compute the moles of SO2 that are produced via the the 2:2 mole ratio of ZnS to SO2:

[tex]n_{SO_2}=56.25gZnS*\frac{1molZnS}{97.47gZnS}*\frac{2molSO_2}{2molZnS} \\\\n_{SO_2}=0.577molSO_2[/tex]

Regards!