Which best describes what happens when a person sees red leaf

A. Human eyes reflect red light back to the leaf

B. The leaf absorbs res light from human eyes

C. Red light reflected from the leaf enters human eyes

D. The leaf radiates all colors of light except red to human eyes

The boiling of water and sublimation of iodine crystals are endothermic processes.

Answer: Option B & C

Explanation:

Endothermic process are the classifications of chemical reactions where the heat is absorbed by the system from the surroundings. As the matters can exists in three phases like solid, liquid and gases.

The endothermic process occurs by absorption of heat energy by the system. So according to the given options, the boiling of water and iodine crystal sublimation follows endothermic process. In the boiling of water occurs when the water molecules absorb heat from the surrounding and convert to gas phase.

Similarly, the sublimation of iodine crystals also require heat energy from the surrounding to break the bonds of the iodine crystals to sublimate to gas phase. Thus the boiling of water and sublimation of iodine crystals are the examples of endothermic processes.

Temperature... - A

1. An ice cube that is dropped into a glass of water melts because - D

2 What type of energy transformation occurs when a light bulb is turned on -

C

➷ Temperature is an indicator of the amount of thermal energy that an object possesses [option A]

An ice cube that is dropped into a glass of water melts because heat energy moves from the water to the ice [option D]

Electrical energy is transformed into heat and light energy [option C]

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Answer: Below

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Explanation:

The atomic theory is that all matter is made up of tiny units or particles called atoms. This theory describes the characteristics, structure and behavior of atoms as well as the components that make up atoms. Furthermore, the theory states that all elements are made up of identical atoms.

The atomic theory is a theory in the study of chemistry that states atoms are the building blocks of matter. Atoms contain protons, neutrons and electrons. Protons, which have a positive charge, and neutrons are found in the nucleus of the atom. Electrons, which have a negative charge, orbit the nucleus.

According to the atomic theory, all elements contain atoms. The difference is the number of protons, electrons and neutrons in that atom. For instance, hydrogen contains one proton and one electron but no neutrons. Oxygen, on the other hand contains eight protons, electrons and neutrons. The difference in protons, electrons and neutrons determines the stability and the other properties of any particular element. These elements are grouped according to their atomic masses, which depend on the number of protons and neutrons in each of the atoms. Because oxygen has more protons and neutrons than hydrogen, it has a higher atomic mass.

the answer maybe B or A

Final answer:

Fungi are more closely related to animals than plants because they are both heterotrophs, while plants are autotrophs. Fungi share characteristics such as being heterotrophic, having chitin in their cell walls, and storing carbohydrates as glycogen with animals.

Explanation:

Fungi are more closely related to animals than they are to plants because fungi and animals are both heterotrophs, while plants are autotrophs. Fungi obtain their energy by consuming complex organic compounds from outside sources, similar to animals. Fungi also share other characteristics with animals, such as having chitin in their cell walls and storing carbohydrates as glycogen.

Lustrous

Solid at room temerature

Semiconducting

Amphoteric

Brittle

Considering there are different fields of science and many career involving the matter, I'd say that option D. They learn about the world through observation. makes the most sense in this scenario.

I hope this helps! :)

I think the answer to this is D, I am sorry if I’m wrong

Consider this reaction : 2Al2O3 → 4Al + 3O2

The number of moles of Al2O3 can be determined from its mass →

Number of moles of AL2O3 = mass/molar mass

                                               =51/(27x2+16x3)

                                               = 0.5 mol

Now, calculate aluminium's number of moles from the mole ratio →

Mole ratio  4(Al) : 2(Al2O3)

Number of moles of Al = (4/2) x0.5mol = 1 mol

Mass of Al = number of moles x molar mass

                                   = 1x27

                                   = 27kg (theoretical yield)

Given, actual yield = 17kg

Therefore, percentage yield = (actual yield / theoretical yield ) x 100

                             = (17/27)x100

                               = 62.96%

They go through something called the Water Cycle,

First, they will go through the Evaporation Step where the water will evaporate into a gas and raise into the clouds.

Then, they will go through the Condensation Step where the Vapor that went into the clouds will cool down and turn back into liquid water.

Next, they will go through the Precipitation Step where the Water (which can be Rain Hail snow or Sleet) will fall out of the clouds.

Finally, all of the fallen water will collect into Lakes, Oceans, Rivers, Streams and sometimes water under the ground.

if the water is still turning into vapor from condensation it will turn to rain eventually but it cant be evaporated if heat cant get the water think as a air bubble the air remains until it pops or if its frozen in ice it will remain till the water melts and exposes the air to the world again.

Answer:D

Explanation:according to Kinetic molecular theory the kinetic energy is directly proportional to the absolute temperature.

It means that when we increase the temprature the motion of molecules increase,as a result the rate of reaction is also increased.

Which means that the effective collision is also increased.

Answer:

D) Increasing the temperature increases the energy of the molecules.

Explanation:

Increasing the temperature increases the energy of the molecules.

As temperature increases the energy of the molecules increases and the energy of the collision making it more likely for a reaction to occur.

For the Ideal Gas Law, pressure is measured in atmospheres, volume is measured in liters, and temperature is measured in Kelvin. Obviously, moles is measured in moles.

The ideal gas law measures volume in liters (L). The law also explores the relationship between pressure, volume, number of moles of the gas, and temperature. Hence, we can calculate the volume if we know the other three factors.

The ideal gas law, usually written as PV = nRT, where 'P' represents pressure, 'V' volume, 'n' the number of moles of the gas, 'R' the ideal gas constant, and 'T' the temperature, measures volume in liters (L). According to Avogadro's Law, the volume of a gas at a constant temperature and pressure is proportional to the number of gas molecules. So in the ideal gas law, if we know the pressure, temperature, and the number of moles of a gas, we can calculate its volume.

For example, if we have a vessel with a known pressure and temperature, and we insert a known quantity of gas (in moles), we can use the ideal gas law to calculate the volume that the gas will occupy under those conditions.

Remember, this is for ideal gases. Actual gases may deviate from this law under certain conditions.

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where is the work sheet?

Plz post the worksheet so that I can do it for you. Please don't report this, i am trying to help!

Because water molecules are polar, water can dissolve many other polar substances. Water can also dissolve ionic compounds such as table salt.

Soluble substances anything power like that can be broken down by water like kool aid powder sugar salt. Please give me brainliest answer.

:) Hope this helped have a good day!

In No3-1 the oxidation number of oxygen is -5 so oxidation number of N would be +5

Oxidation state on [tex]\text{N}[/tex] as in the nitrate ion [tex]{\text{NO}_3}^{-}[/tex]: +5.

The sum of oxidation states on all atoms in an ion should be the same as the charge of the ion.

The oxidation state of nitrogen N tends to vary. However, the oxidation state of oxygen O is -2 in most cases, with the following exceptions:

To find the oxidation state on N, consider the atoms in a nitrate ion:

The oxidation state of each O atom is expected to be -2. There are three O atoms in each nitrate ion. The oxidation state of the three atoms will add up to [tex]3 \times (-2) = -6[/tex].

The oxidation state of the N atom needs to be found. Charge on the nitrate ion is -1. Thus

[tex]\begin{array}{ccc}\text{oxidation state on all atoms in the ion}&= &\text{charge of the ion}\\(\text{oxidation state on N}) + 3 \times (-2) &=& -1\end{array}[/tex]

[tex](\text{oxidation state on N}) = -1 - 3\times(-2) = -1 - (-6) = -1 + 6 = +5[/tex].

Therefore, the oxidation state of the nitrogen N atom in the nitrate ion [tex]{\text{NO}_3}^{-}[/tex] is +5.

Answer:

23.34 %.

Explanation:

Cd: 112.411 g/mol, N: 14.0067 g/mol, O: 15.999 g/mol, and H: 1.008 g/mol.

Cd(NO₃)₂•4H₂O

mass of the formula unit = (At. mass of Cd) + 2(At. mass of N) + 10(At. mass of O) + 8(At. mass of H) = (112.411 g/mol) + 2(14.0067 g/mol) + 10(15.999 g/mol) + 8(1.008 g/mol) = 308.5 g/mol.

mass of water = (4 × 2 × 1.008 g/mol) + (4 × 15.999 g/mol) = 72.0 g/mol.

A neutron has a mass that is about equal to the mass of a proton, approximately 1.0087 amu, while an electron has a much smaller mass of about 0.00055 amu.

A neutron has a mass that is about equal to the mass of a proton. While the exact values can vary slightly due to isotopic differences, generally, a neutron is indeed slightly heavier than a proton, with a mass of approximately 1.0087 atomic mass units (amu), and a proton has a mass of approximately 1.0073 amu. In contrast, an electron is a much lighter particle with a mass of about 0.00055 amu. This significant difference in mass means that it would take about 1,836 electrons to equal the mass of one proton or neutron. The correct answer, therefore, is option C, that a neutron's mass is about equal to the mass of a proton.

Final answer:

A neutron has a mass that is C. about equal to the mass of a proton, not the mass of an electron. A neutron is slightly heavier than a proton and much heavier than an electron, with a weight of approximately 1.0087 amu. The correct answer is option C.

Explanation:

The mass of a neutron is about equal to the mass of a proton, which makes option C the correct answer. Specifically, a neutron has a mass of 1.0087 atomic mass units (amu) whereas a proton has a mass of 1.0073 amu. In comparison, an electron is a much lighter particle with a mass of approximately 0.00055 amu. Thus, it would take about 1800 electrons to equal the mass of one proton.

Additionally, in terms of charge, the neutron is electrically neutral with zero charge, the proton has a charge of 1+, and the electron has a charge of 1-. These subatomic particles are fundamental to the structure of atoms, with protons and neutrons making up the nucleus and electrons orbiting around it.

Answer:

Reducing or increasing the amount of H+ ions / hydronium (H3O+) ions

Explanation:

To reduce the pH (reducing the strength of the acid) can be done by adding a base (including a conjugate base such as bicarbonate ion) which will absorb the H+ ions either through adsorption or reaction.

Adding more H+ decreases the pH of the acid making it stronger. This can be done by adding HCL that will dissociate and increase the H+ ions.

Final answer:

The strength of an acid can be modified by altering its molecular structure or by changing the acid's concentration in a solution. Acid strength is directly related to the ability of the acid to donate hydrogen ions, which is influenced by the electronegativity of the atoms involved in the acid molecule.

Explanation:

It is indeed possible to change the strength of an acid. The strength of an acid depends on its ability to donate hydrogen ions (H+) in solution. Strong acids are characterized by 100% ionization in solution, while weak acids only partially ionize. The molecular structure of an acid, especially the electronegativity of its central atom, plays a significant role in acid strength. By modifying the molecular structure, such as by substituting atoms or groups with more electronegative ones, the acid strength can be changed.

For instance, adding more electronegative elements to the structure can increase the acid's ability to donate H+. Moreover, using the periodic table as a guide, we can predict the acid strength: as you move from left to right and down the periodic table, acid strength increases due to increasing electronegativity. One could also alter acid concentration or mix it with other substances (like bases) to change the pH, and thus, the perceived strength of the acid in a given solution.

10.80 ° C

From the information given;

Initial temperature of water =  24.85°C

Final temperature of water = 35.65°C

Mass of water = 1000 g

The specific heat of water ,c = 4.184 J/g °C.

The heat capacity of the calorimeter  = 695 J/ °C

Change in temperature ΔT = 35.65°C - 24.85°C

                                             = 10.80°C

the answer is d. when more solute is added

The correct answer is - False.

The soil erosion is a primary environment problem. It latter has effects that fall into the category of secondary environmental issues. The erosion of the soil is a very serious environmental issue, as it is the prime natural resources that enables the growth of plants, thus food for the living organisms, including the humans. Also, with high rates of erosion, the process of desertification significantly increases, as the soil is stripped of its top layers. The sediments that have been stripped of the soil can cause pollution of the air, though the stronger winds and storms that carry them, or with sediments getting to the water bodies and making them all murky, muddy.

it stays exactly the same

Answer:

During a physical change, items may change, but the mass is the same.

The energy transformations are similar because they result into radiant energy.

As for the lamp, Electrical energy is transformed into light when the filament

or mercury vapor glows on passage of current.

The fire- chemical energy is turned to light energy during the combustion of carbon.  Both products comprise of ultraviolet radiation which is a form of radiant energy.

Answer:

the answer is C

Explanation:

It extends 10 to 15 kilometers (6 to 10 miles) above the earth's surface depending on latitude and time of the year. The troposphere contains most of the atmosphere's water vapor.

The ozone layer is located 10-15 km above the earth's surface.

Learn more about the ozone layer here:

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It is diffusion.

In a plant it is osmosis but thats not in an area

Solution has honestly got nothing to do with it.

The last one has to do with equilibrium

SO ITS DIFFUSION

:)

Answer: diffusion

Explanation:

Osmosis is defined as the process in which molecules of a solvent tend to move through a semipermeable membrane from a region of low concentration solution to a region of more concentrated solution in a membrane.

Solution is the homogeneous mixture of solute and solvent where solute is the component which is present in smaller proportion and solvent is the component which is present in larger proportion.

Diffusion is defined as the random motion of molecules from areas of higher concentration to lower concentration.

Homeostasis is the active regulation and maintenance of a stable internal physiological state in the face of a changing external environment.

condensation is the change from a gas to a liquid.

for example, when a humid room is cooling, the water vapour particles lose kinetic energy, move closer together and become liquid water.

hope this helps! ~ •lipika•

a subshell is a subdivision of electron shells seperated by electron orbitals

Phases of meiosis II.

Prophase II: Starting cells are the haploid cells made in meiosis I. Chromosomes condense.

Metaphase II: Chromosomes line up at the metaphase plate.

Anaphase II: Sister chromatids separate to opposite ends of the cell.

Learning how our body works and other things in the world work.

Answer:

C₃H₄.

Explanation:

The no. of moles of CO₂ produced = mass/molar mass = 5.80 mg/44.0 g/mol = 0.1318 mmol.

Which is corresponding to 0.1318 mmol of C.

The no. of moles of H₂O produced = mass/molar mass = 1.58 mg/18.0 g/mol = 0.08778 mmol.

which corresponds to (0.08778 x 2) = 0.1756 mmoles of H.

The ratio of the number of moles of hydrogen to carbon in the composition of the compound will be 0.1756/0.1318 = 1.332 = 1 + 1/3 = 4/3.

D) Li + N2​

                     2Li3N(s) → 6Li(s) + N2(g)

Electric engines change electricity into magnetism

Answer:

A-Running an electric current through a magnet can create a magnetic field.

Explanation:

The answer is A-Running an electric current through a magnet can create a magnetic field. I chose B and got it wrong on my test. The correct one is A