Which image(s) would be considered pure substances? A) V B) I and II C) II and IV D) III and V

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).

Answer:

A) electrons

Explanation:

protons are positive , neutrons are neutral , and electrons are negative , and non-polar does not have a charge . so electrons is correct

The particle that has negative charge is electron

Hence Electrons is the correct option (A)

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Answer: 2)Vitamin A is added to rice to combat blindness.

Explanation:

The genetic engineering is a process of manipulation of the genome of the organism by either introducing new genes in an organism's genome or by removing the defective genes. This is basically performed to introduce new traits in an organism or to remove the disease causing genes.

Vitamin A is added to rice to combat blindness is the correct option because genetic engineering will ensure the introduction of the genes which are responsible for secretion of vitamin A in the rice plant as the rice species does not naturally produce vitamin A. This will help in combating the disorder of blindness in humans.  

Genetic engineering involves introducing genetic material into organisms to create traits for specific purposes.

Genetic engineering involves the artificial incorporation of genetic material from one form of life into another, creating genetically modified organisms (GMOs) like 'golden rice' or 'Bt' corn. These modifications aim to introduce desirable traits into plants for various purposes.

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)

The answer is C) Communities in an effort to beautify local neighborhoods

Answer: nature that benefit mankind

Explanation:

Ecosystem services are the benefits that mankind freely gain from nature and well-functioning ecosystems. For example, agroecosystems, forest ecosystems, grassland ecosystems and aquatic ecosystems. When these ecosystems function well, they provide benefits such as agricultural produce, timber, and aquatic organisms such as fishes and crabs. These benefits together are called 'ecosystem services'.

the answer is D i think

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

The mass per unit volume is substance called density.

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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:

17.65 %.

Explanation:

% H = [Atomic mass of (3H)/molar mass of NH₃] x 100 = [(3 x 1.0)/(17)] x 100 = 17.65 %.

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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]

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Concentration Definition. In chemistry, concentration refers to the amount of a substance per defined space. Another definition is that concentration is the ratio of solute in a solution to either solvent or total solution. Concentration usually is expressed in terms of mass per unit volume.

Concentration = no of moles of solute/solvent

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.

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

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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.

As the temperature is increased all the molecules including the gas molecules get more kinetic energy, they move faster, and more of them can escape from the solution when they hit the surface meaning fewer molecules stay inside, hence lower solubility.

Final answer:

The solubility of gases in liquids decreases with rising temperature because added thermal energy increases kinetic energy, enabling the gas molecules to overcome the attraction of the solvent molecules and escape back into the gas phase.

Explanation:

The solubility of gases in liquids is affected by temperature. As temperature increases, the kinetic energy of molecules in both the solvent and the solute also increases. Specifically for gases like HCl, NH₃, and SO₂, which are soluble under standard conditions, an increase in temperature causes these gas molecules to have a greater tendency to escape from the attraction of the solvent molecules and revert to the gas phase due to the rise in kinetic energy. Therefore, this leads to a decrease in their solubility within the solvent.

For example, when we heat a solvent that has a gas dissolved in it, we provide thermal energy that overcomes the attractive forces between the gas and solvent molecules. This process is similar to how increased temperature results in higher vapor pressure in pure liquids because thermal energy overcomes the attractive forces between the molecules, allowing them to enter the gas phase.

In summary, the dissolution of most gases is an exothermic process, meaning it releases heat, but when heat is added to the system, it facilitates the separation of the gas from the solution, thus decreasing gas solubility with the rise in temperature

Meteors are a streak of light. A meteorite is when it hits Earth's surface. So, it would be D.

Final answer:

Meteorites have struck the Earth's surface, but meteors have not. Meteorites are meteoroids that land on Earth, whereas meteors are glowing gases in the atmosphere that do not reach the surface.

Explanation:

Meteorites are meteoroids that survive the journey through the atmosphere and hit the Earth's surface. On the other hand, meteors are the glowing trail of gases formed as meteoroids heat up in the atmosphere but do not reach the Earth's surface.

Meteorites can be found on Earth, providing valuable information about our solar system, while most meteors burn up before reaching the surface. The distinction between meteorites and meteors lies in their fate upon entering the Earth's atmosphere.

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.

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.

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Wavelength and frequency are inversely proportional to each other. ... Even though the wave speed is calculated by multiplying wavelength by frequency, an alteration in wavelength does not affect wave speed. Rather, an alteration in wavelength affects the frequency in an inverse manner.

❤️Hello!❤️ This is simple question and easy to understand.

so first you use a formula to calculate frequency of the wave.

v _ stands for velocity a.k.a speed

f_ stands for frequency which you have to find.

(pronounced lemda)_ stands for wavelength.

Then you gonna place all your values according to you have in the formula as shown then solve for f.

Finally, you use the time formula

where

T_ is period a.k.a time which equal to the reciprocal of frequency or equal to 1/f.

Simply input your values according to the formula and you your answer as 0.5s Hope this helps!  ↪️ Autumn ↩️

Answer:

it is the point where the material turns to gas

Explanation:

Answer: The melting point or boiling point of a substance at a specific pressure

Explanation: That was the correct answer apex.

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.

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:

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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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 %.

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.

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:

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."

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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A.

convection and conduction, but not radiation

The answer is A, thank you boredpanda for checking my answer probably accendintly.

Hope this helps!