Which family on the periodic table is least likely to enter into chemical reactions? 1 2 17 18

D. the total mass of the products will be equal to the original mass of the reactants

Answer:

it is the answer d. the total mass of the products will be equal to the original mass of the reactants

Explanation:

The exosphere is the uppermost layer of Earth's atmosphere

Answer:

The Moon and stars lie outside the Earth's Atmosphere

Explanation:

In order to understand this concept we need to understand what the atmosphere is and how high it extends from the earth's surface.

The atmosphere is a protective envelop around the Earth. It not only protects us from the harmful UV radiations but also helps to retain the heat near the surface due to Green House Effect.

From lowest to highest, the major layers of the atmosphere are:

The Exosphere on the Atmosphere extends up to 10,000 km above the Earth's Surface. The moon is the nearest celestial object to Earth. it is at a distance of 3,84,400 km from earth i.e. more than 38 times the height of the Atmosphere. Stars are farther away from the Earth sometimes almost millions of light years away.

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One way in which light waves are different from sound waves is that light waves

A. can move easily through empty space

B.are caused by rapid vibrations

C.travel more slowly

D.can be reflected

D.can be reflected

is the answer

Hello

V= m/p when V= volume, m, mass and p the density

then

V=18754000/0,7888

Remember that you first have to convert kg to gr, simply multiplied by 1000.

then

V= 23799492 cm3

Best regards

Answer:

1,620 J.

Explanation:

Q = m.c.ΔT.

where, Q is the amount of heat released from ethanol cooling,

m is the mass of ethanol (m = 60.0 g),

c is the specific heat of ethanol in the liquid phase, since the T is cooled below the boiling point and above the melting point (c = 1.0 J/g °C),

ΔT is the temperature difference (final T - initial T) (ΔT = 43.0 °C – 70.0 °C = - 27.0 °C).

∴ Q = m.c.ΔT = (60.0 g)(1.0 J/g °C)(- 27.0 °C) = - 1620 J.

Answer:

its 1600 J

Explanation:

i just got it right on the quiz

Answer:

(D) Na₂SO₄•10H₂O (M = 286).

Explanation:

ΔTf = i.Kf.m,

Where, ΔTf is the depression in freezing point of water.

i is van't Hoff factor.

Kf is the molal depression constant.

m is the molality of the solute.

(A) CuSO₄•5H₂O:

CuSO₄ is dissociated to Cu⁺² and SO₄²⁻.

So, i = dissociated ions/no. of particles = 2/1 = 2.

B) NiSO₄•6H₂O:

NiSO₄ is dissociated to Ni⁺² and SO₄²⁻.

So, i = dissociated ions/no. of particles = 2/1 = 2.

(C) MgSO₄•7H₂O:

MgSO₄ is dissociated to Mg⁺² and SO₄²⁻.

So, i = dissociated ions/no. of particles = 2/1 = 2.

(D) Na₂SO₄•10H₂O:

Na₂SO₄ is dissociated to 2 Na⁺ and SO₄²⁻.

So, i = dissociated ions/no. of particles = 3/1 = 3.

∴ The salt with the high (i) value is Na₂SO₄•10H₂O.

So, the highest ΔTf resulted by adding Na₂SO₄•10H₂O salt.

Consider this reaction  : 2KClO3 → 2KCl + 3O2  

Mole ratio = 3(O2) : 2(KClO3)

Number of moles of O2 = 3/2*7.38 = 11.07 mol

Number of moles of 02 = mass/molar mass

Therefore, mass = 11.07*(16*2) = 354.24 g

Note: It's mandatory to always balance the reaction at first

Answer:

[tex]m_{O_2}=354.24gO_2[/tex]

Explanation:

Hello,

In this case, the undergoing chemical reaction is:

[tex]2KClO_3(s)\rightarrow 2KCl(s)+3O_2(g)[/tex]

In such a way, as 7.38 moles of potassium chloride are decomposed, the resulting grams of oxygen are computed considering a 2 to 3 molar relationship in the chemical reaction:

[tex]m_{O_2}=7.38molKClO_3*\frac{3molO_2}{2molKClO_3}*\frac{32gO_2}{1molO_2} \\\\m_{O_2}=354.24gO_2[/tex]

Best regards.

Answer:

34.33 %.

34.33 %.

34.33 %.

Explanation:

W% = [(W of solute NaF)/(W of solution)] x 100.

W of solute NaF = 65.4 g.

W of solution = W of solute NaF + W of water = 65.4 g + 125.1 g = 190.5 g.

∴ W% = [(W of solute NaF)/(W of solution)] x 100 = [(65.4 g)/(190.5 g)] x 100 = 34.33 %.

Answer:

Answer is B Hanley Cells

Explanation:

The concentration of CH3OH in the solution is found by converting the given mass to moles and then dividing by the volume of the solution in liters, resulting in a concentration of approximately 1.7 M.

To find the concentration of CH3OH in the solution, we first need to convert grams to moles. The molar mass of CH3OH (methanol) is approximately 32.04 g/mol, so you divide 12.5g by 32.04 g/mol to get the amount in moles: around 0.39 mol. Now, concentration is defined as the number of moles of solute (CH3OH in this case) per liter of solution. As the volume given is in mL, we need to convert it to liters by dividing 230 mL by 1000 to get 0.23 L. Finally, dividing the moles of CH3OH by the volume of the solution in liters gives the concentration in M (Molarity), which is about 1.7 M.

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Photosynthesis is process by which green plants and certain other organisms use the energy of light to convert carbon dioxide and water into the simple sugar glucose. In so doing, photosynthesis provides the basic energy source for virtually all organisms. An extremely important byproduct of photosynthesis is oxygen, on which most organisms depend.

Photosynthesis is the process in which the a plant gets energy from the sun also photosynthesis can happen when water gets into the roots of the plant.

Please provide more info

Answer:

C₅H₁₂.

Explanation:

Which is corresponding to 0.03477 mol of C.

which corresponds to (0.042 x 2) = 0.084 moles of hydrogen.

Answer:

150.0 mL.

Explanation:

∵ (MV) before dilution = (MV) after dilution.

∴ V before dilution = (MV) after dilution / M before dilution = (0.15 M)(500.0 mL)/(0.50 M) = 150.0 mL.

A pedigree chart tracks inherited traits, and a Punnett square is used to predict the genotype of offspring. A pedigree chart provides a visual representation of the inheritance of traits within a family, while a Punnett square is a tool used to predict the likelihood of an offspring inheriting particular genotypes from its parents.

The answers to the questions are as follows:

1) The probability of producing offspring with genotype Rr when crossing a pea plant with round seeds (RR) with another pea plant with wrinkled seeds (rr) is 100%. This is because all offspring will inherit one R allele from the round-seeded parent and one r allele from the wrinkled-seeded parent, resulting in the Rr genotype for all offspring.

 2) A completely filled circle on a pedigree chart represents a male with a disease. An unfilled circle represents a female with a disease, a half-filled circle represents a carrier female, and a half-filled square represents a carrier male.

3) Based on the Punnett square described, with the female parent being Yy and the male parent being YY, the expected percentage of offspring with green seeds (yy) is 0%. This is because the male parent can only contribute the Y allele, and the female parent can contribute either Y or y, but not both recessive alleles needed for green seeds in the same offspring.

4) Offspring 4, which is represented by a completely shaded square on the pedigree chart, describes a male having the disease. This is because a completely filled square represents an affected male, while a half-shaded square would represent a carrier male.

 5) The statement that accurately describes a pedigree chart is: A pedigree chart tracks inherited traits from parents to offspring. Pedigree charts are used to analyze the pattern of inheritance within a family, but they do not predict genotypes or percentages of offspring with specific traits. They show the phenotype and carrier status of individuals based on observed traits over generations.

 6) For the Punnett square with a tall pea plant (Tt) crossed with a short pea plant (tt), the correct match of the box numbers and the genotype of the offspring is:

- Box 1: Tt

- Box 2: Tt

- Box 3: tt

- Box 4: tt

This is because the tall plant can contribute either a T or a t allele, and the short plant can only contribute a t allele.

 7) The true statement is: A pedigree chart tracks inherited traits, and a Punnett square is used to predict the genotype of offspring. A pedigree chart provides a visual representation of the inheritance of traits within a family, while a Punnett square is a tool used to predict the likelihood of an offspring inheriting particular genotypes from its parents.

Answer:

They all include an exchange of gases between the atmosphere and living organisms.

Explanation:

The carbon, oxygen, and nitrogen cycles are known as biogeochemical cycles this means that the gases spend a portion of the cycle in living things ( biological systems) and a portion in the nonliving environment (geographical systems). All the nitrogen, oxygen and nitrogen cycles involves movement of masses of gases through the atmosphere as the gases leave or enter living organisms.

Answer:

Option C:- concentration of products

Explanation:

According to Le Chateleir's principle,

if the forward reaction is favored in the equilibrium then concentration of products will increase and concentration of reactants will decrease.

If the reverse reaction is favored in the equilibrium then concentration of products will decrease and concentration of reactants will increase.

When the forward reaction is favored in a chemical equilibrium, the concentration of products will increase as the equilibrium shifts to the right, in accordance with Le Chatelier's principle.

When a chemical reaction reaches equilibrium and the forward reaction is favored, we observe that the equilibrium shifts to the right or toward the product side. This means that there will be an increase in the concentration of products. In a dynamic equilibrium, when we increase the concentration of the reactants, the system will respond by shifting the equilibrium to the right to use up the excess reactants and produce more products.

This behavior adheres to Le Chatelier's principle, which informs us that the system will adjust to minimize the change, leading to an increase in product concentration until equilibrium is reestablished.

For example, if the concentration of a reactant such as SCN- (aq) is increased, the rate of the forward reaction will increase, leading to a decrease in the concentration of this reactant as it is converted into the product FeSCN²+ (aq), consequently, the concentration of FeSCN²+ will increase as the equilibrium shifts to the right.

Talc has a soapy feel.  

Also, gypsum can scratch talc, but talc cannot scratch gypsum.

Hope This Helps!      Have A Nice Feeling!!

Answer:

B. Talc has soapy feel.

Explanation:

Gypsum is a hydrated calcium sulphate mineral .

The chemical formula of gypsum is [tex] CaSO_4.2H_2O[/tex]

It consist of calcium, sulphur, oxygen and hydrogen.

It is soft sulphate mineral. It is used in plaster  formation. It is used  in blackboard chalk formation.It is used as a fertilizer.It Talc can not  scratch gypsum  because it is harder than talc.It has no soapy feel.

Talc is hydrous magnesium silicate mineral . It is usually green ,gray, white , brown or colourless.It is a translucent mineral . It has pearly luster.

It is soften known mineral. The chemical formula of talc is [tex]Mg_3Si_4O_{10}(OH)_2[/tex].It consist of magnesium, silicon, oxygen and hydrogen.It has extreme softness and greasy. It has soapy feel. Gypsum is harder than talc and more difficult to scratch.

Hence, the option B is true.

Answer: B. Talc has soapy feel.

The mass per volume of a substance is called its density.

The mass per unit volume is substance called density.

Hope this helps

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adhesion and cohesion.

Answer:

Cohesion and adhesion properties of water, and capillarity property.

Explanation:

Cohesion refers to the attraction forces of water molecules between them. These cohesive forces are possible due to the water capacity to generate hydrogen bonds.

The cohesive forces are responsible for superficial tension, an example of this is when you fill a glass of water and then put some tears into, it not spills but it forms like a dome of water - You can see the image attached -, anyway this superficial tension is the responsible of make liquids more stablish to break itself when are subdue to stress or tension. The water molecules form hydrogen bonds and "glue" each other with their neighbors and with the molecules who are more deeply into the liquid.  

On the other hand, Adhesion allows water "glue" itself, but also adhere to other molecules or material. Adhesion is the attraction of different kinds of molecules, and water can make it very strongly, more if the molecule has positive or negative electric properties.

Adhesion is responsible for capillarity, it happens when water up through a thin glass tube (you can see the image 2 attached), or in the roots of the plants to their leaves. The water climbs through the stem of the plants due to their capacity to adhere to the molecules of the steam, and their capillarity property.

the balanced equation for the reaction is

Ca(OH)₂ + 2HNO₃ ---> Ca(NO₃)₂ + 2H₂O

Molar ratio of Ca(OH)₂ to HNO₃ is 1:2

Number of moles of Ca(OH)₂ reacted - 0.5 moldm⁻³ x 50.0 x 10⁻³ dm³

number of Ca(OH)₂ moles  - 0.025 mol

according to the molar ratio

1 mol of Ca(OH)₂ reacts with 2 mol of HNO₃

therefore 0.025 mol of Ca(OH)₂ reacts with - 2 x 0.025 = 0.05 mol of HNO₃

there are 0.05 mol of HNO₃ in 125 mL

and concentration = number of moles / volume in 1 dm³

concentration = 0.05 mol / 125 x 10⁻³ dm

concentration of HNO₃ = 0.4 mol/dm³

The concentration of HON3 can be determined by understanding the molar relationship between Ca(OH)2 and HNO3. In this scenario the concentration of HNO3 is found to be 0.4 M.

The subject of this question is chemistry, specifically the topic of titration in acid-base reactions. To find the concentration of HNO3, we need to understand the molar relationship between Ca(OH)2 and HNO3. Each molecule of Ca(OH)2 can neutralize two molecules of HNO3 because it provides two OH- ions.

The moles of Ca(OH)2 used can be calculated as:
Moles = Molar concentration * volume.
So, 0.5 M * 50.0 mL/1000 = 0.025 mol. Since each mole of Ca(OH)2 neutralizes two moles of HNO3 0.025 mol of Ca(OH)2 will neutralize 0.05 mol of HNO3.

Now, we can find the concentration of HNO3 by dividing the moles of HNO3 by its volume:
Concentration = Moles/volume.
Therefore HNO3 concentration = 0.05 mol / (125 mL/1000) = 0.4 M.

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It is part of oceans, air, rocks, soil and all living things. Carbon doesn't stay in one place. It is always on the move! In the atmosphere, carbon is attached to oxygen in a gas called carbon dioxide.

Hope this helps.

B. White Dwarf.

The star would eventually run out of hydrogen fuel in the core. The core would shrink and heats up. As the temperature in the core increases, some of the helium in the core will undergo the triple-alpha process to produce elements such as Be, C, and O. The triple-alpha process will heat the outer layers of the star and blow them away from the core. This process will take a long time. Meanwhile, a planetary nebula will form.

As the outer layers of gas leave the core and cool down, they become no longer visible. The only thing left is the core of the star. Consider the Chandrasekhar Limit:

Chandrasekhar Limit: [tex]1.4 \;M_\odot[/tex].

A star with core mass smaller than the Chandrasekhar Limit will not overcome electron degeneracy and end up as a white dwarf. Most of the outer layer of the star in question here will be blown away already. The core mass of this star will be only a fraction of its [tex]0.5 \;M_\odot[/tex], which is much smaller than the Chandrasekhar Limit.

As the star completes the triple alpha process, its core continues to get smaller. Eventually, atoms will get so close that electrons from two nearby atoms will almost run into each other. By Pauli Exclusion Principle, that's not going to happen. Electron degeneracy will exert a strong outward force on the core. It would balance the inward gravitational pull and prevent the star from collapsing any further. The star will not go any smaller. Still, it will gain in temperature and glow on the blue end of the spectrum. It will end up as a white dwarf.

Pressure is directly related to density implies increase in pressure results in increase in density. Hopes this helps,love! <3

Answer:

Pressure is directly proportional to density.

Explanation:

Answer:

They decrease, because of the stronger effective nuclear charge.

Explanation:

Thus, the right choice is: They decrease, because of the stronger effective nuclear charge.

Answer: They decrease, because of the stronger effective nuclear charge (C)

Answer:

A base is A. a substance that increace the concentration of OH- ions in solution.

Explanation:

According to Arrhenius Theory, a base is any substance that, when dissolved, releases hydroxyl ions (OH–). The bases are also known as alkalis, because when the hydroxyl groups dissociate and release, the pH of the solutions increases, that is, the solution becomes alkaline. Then its pH is greater than 7.

According to the Brønsted-Lowry Theory, a base is a substance capable of accepting protons (H +) in solution.

According to Lewis Theory, the bases are also considered those substances capable of donating or transferring electrons.

So, a base is A. a substance that increace the concentration of OH- ions in solution.

Answer:

its an observation about chemical equilibrium of reactions . it states that changes in the temperature, pressure, volume, or concentration of a system will result in predictable and opposing changes in the system in order to  achieve a new equilibrium state.

Explanation:

LeChatelier's Principle is an "equilibrium subjected to a stress tends to adjust itself so as to relieve the stress."

C red light isn't an efficient source of light

Answer:

Bright red light.

Explanation:

The light when strikes on an object has the ability to show the photoelectric effect. Different light has different wavelength that determines their photoelectric effects.

The ultraviolet light emit the large amount of energy whereas the redllight emits the least amount of energy. The bright red light is least likely to produce the photoelectric effect.

Thus, the correct answer is option (C).

Electromagnetic Waves

Explanation:

Electromagnetic waves do not require a medium to propagate whereas mechanical wave does.

Example: Sound wave is mechanical wave. It needs a medium to transfer energy from one place to another.

And, X-rays. These are electromagnetic waves & these transfer energy via electric & magnetic fields.

An electromagnetic wave does not require a medium to propagate, whereas a mechanical wave does require a medium.

The electromagnetic wavs are waves that consist of oscillating electric and magnetic fields. They can travel through vacuum or empty space, such as through the vacuum of outer space. Examples of electromagnetic waves include radio waves, microwaves, infrared waves, visible light, ultraviolet rays, X-rays, and gamma rays. These waves can travel through the vacuum of space or air, as well as through other mediums like water or solids.

On the other hand, mechanical waves require a medium, such as a solid, liquid, or gas, to propagate.

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the answer is D i think