Which are physical changes?
Select all that apply.
O curling hair with rollers
O cutting cheese with knife
O cooking egg whites in skillet
O cleaning stains with bleach

The food substance which gives energy for humans are the carbohydrates.

It follows that among the classes of food substances, the group of food or diet which has the highest calories supply of energy are the carbohydrates. These carbohydrates are the energy giving food.

Aside carbohydrates, other food classes include the following:

The proteins helps in building the body. The vitamins are the body regulating and protecting food.

So therefore, we can now deduce that when we consume foods such as rice, maize and others forms of carbohydrates, it gives us energy.

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At the equivalence point moles H+ = moles OH- so pH = 7.00  is the pH of the resulting solution.

There are two ways to measure pH calorimetrically with indicator fluids or sheets and electrochemically with electrodes and a millivoltmeter for greater accuracy (pH meter).

Moles HClO₄ = 0.05 L x 0.100 M = 0.005

Moles NaOH = 0.02 L x 0.200 M=0.004

Moles HClO₄ in excess = 0.005 - 0.004 =0.001

Total volume = 0.07 L

[H+]= 0.001/ 0.07L=0.01428 M

pH = - log 0.01428=1.84

At the equivalence point moles H+ = moles OH- so pH = 7.00

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Answer:

Explanation:

The heater may still work for a few seconds because of the battery, and until the wind starts again the heater would not work

when two polar molecules are close together, the partial positive charge on one molecule will attract the partial charge on the other. this type of intermolecular force is called a dipole-dipole interaction.

Dipole- dipole forces are the attractive force between polar molecules of the positive end of one polar molecule and negative end of other polar molecule. A polar molecule have a partial positive end and partial negative end.

Example of dipole dipole interaction between polar molecules ios HCl ( hydrogen chloride ).

Thus, when two polar molecules are close together, the partial positive charge on one molecule will attract the partial charge on the other. this type of intermolecular force is called a dipole-dipole interaction.

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Facts about toy cars is toy car move with a friction motor

Toy car means a miniature nonfunctioning replica of car and this is play a children called as toy car and the fact of toy car is

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Helium has the smallest atomic radius.

An atom is the smallest unit of regular count number that paperwork a chemical detail. each stable, liquid, gas, and plasma consists of impartial or ionized atoms. Atoms are extremely small, commonly around 100 picometers across.

An atom is a particle of be counted that uniquely defines a chemical element. An atom consists of a primary nucleus this is surrounded by way of one or greater negatively charged electrons. The nucleus is definitely charged and includes one or more notably heavy debris referred to as protons and neutrons.

An atom is any particle of count number at its maximum fundamental stage which incorporates at least one proton. right here are a few examples of the atoms: hydrogen H and neon Ne.

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O will form a 2- ion because it gains 2 electrons is the correct prediction for  an oxide ions charge.

So, option D is correct.

How to predict the oxide ion charge?

Oxide ion charge can be predicted by looking at where it is on the periodic table. The metals form positive ions while the non-metals form negative ions.

The total charge of the element is based on in which column the element is located.

The oxide ion will have a charge of 2− as a result of gaining two electrons.

In conclusion, in the case of oxide formation it carries two negative charges. Negative charge come due to the transfer of electron.

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Explanation:

The molecular formulas for the reactants and products are:

Aluminum acetate - Al(CH3COO)3

Potassium hydroxide - KOH

Aluminum hydroxide - Al(OH)3

Potassium acetate - KCH3COO

Therefore the unbalanced reaction equation can be written as:

Al(CH3COO)3+KOH→Al(OH)3+KCH3COO

The nucleus, which has a positive charge, is the center of an atom. The nucleus of an atom contains almost all of its mass, and the electrons orbit the nucleus in precise ways.

DNA is organized into chromosomes and is located in the nucleus, which is in the center of each cell. A double nuclear membrane (outer and inner) that separates the cytoplasm from the nucleus is called the nuclear envelope, which encircles the cell. The nucleus houses the genes, structures that hold the hereditary information, and regulates and controls the functions of the cell (such as growth and metabolism). In the nucleus, nucleoli, which are tiny bodies, are frequently seen. Nucleoplasm is the matrix that resembles a gel and contains the various nuclear parts.

The nucleus of a cell is made up of chromosomes, nucleoplasm, nucleolus, and a nuclear membrane known as the nuclear envelope. The matrix that exists within the nucleus is referred to as nucleoplasm, also known as karyoplasm. The cytoplasm and the nucleus' components are separated by the nuclear membrane.

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In space light waves move fastest, which is C. This is due to the fact that space is completely open and unrestricted and contains nothing that would do so.

What is Light waves?
The region of the electromagnetic spectrum that the human eye perceives as light, or visible light, is made up of electromagnetic radiation. Typically, visible light is characterised as having wavelengths between 400 and 700 nanometers (nm), or frequencies between 750 and 420 terahertz, which fall between the longer-wavelength infrared and the shorter-wavelength ultraviolet (with shorter wavelengths). The term "light" in physics can be used to more broadly describe electromagnetic radiation of any wavelength, whether or not it is visible. Gamma rays, X-rays, microwaves, and radio waves are all forms of light in this sense. Intensity, propagation direction, frequency or wavelength spectrum, and polarisation are the four main characteristics of light.

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C6H12 is its molecular formula.

What is molecular formula?

Two or more atoms that have been chemically bonded make up a molecule. A molecular formula is the chemical representation of a molecular compound that lists the types and quantities of atoms that make up each molecular unit.

% Carbon equals 85.63%.

Hydrogen percentage:

100% - 85.63% = 14.37%

84.16 g/mol for molar mass

Molecular formula is: =?

% should be treated as mass (g) and their atomic mass divided.

C = 85.63 / 12 = 7.14

H = 14.37 / 1 = 14.37

Subtract the smallest number from both.

C = 7.14 / 7.14 = 1

H = 14.37 / 7.14 = 2.01

, CH2 is the empirical formula.

Empirical weight is equal to 12 + 2 = 14.

n = Molecular weight/Empirical weight

n = 84.16 / 14 = 6.01

Empirical formula times n yields the molecular formula.

Now,

C6H12 = (CH2)n = (CH2)6

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Answer:

Elastic potential energy is what causes a ball to bounce, or rebound, because it is transformed into kinetic energy, which is then used to bring the ball back up.

Explanation:

Oxygen has 6 Valence electrons

Valence shell gains two electrons to achieve complete Valence shell

Sulfur has 6 Valence electrons

valence shell gain 2 electrons to achieve full valence shell.

Fluorine, Chlorine, Bromine and Iodine have 7 Valence electrons and gain 1 electron to achieve full valence shell.

Helium has two Valence electrons and gain 2 electron to achieve full valence shell.

Neon, Argon, Krypton, Xenon and Radon have 8 Valence electrons and have full valence shell.

Elements like fluorine , chlorine, bromine and iodine are called halogens. They are the high reactive non-metals in group 17 of the periodic table. They have seven valence electrons and therefore gain one electron to have a full valence shell.

Non-reactive, non-metallic elements in group 18 of the periodic table that include helium , neon , argon  krypton , xenon , and radon are noble gases. They the least reactive of all known elements, because they have  eight valence electrons and hence outer energy levels are full.

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The statement that correct are a, c and d, which are saying, "Ionic bonds are generally formed when a metal bonds with a non-metal"; "Na+ and Cl- share electrons to form a stable compound. and Na loses an electron to form the cation Na'.

The chemical bond that is formed when the complete sharing of electrons take place, is called a Ionic bond.

Generally, metals loses and electron and non-metals tend to gain an electron. This is why Ionic bonds are usually formed between metals and non-metals.

The ionic bonds are formed when sharing of electron takes place not only by the attraction.

Na⁺ and Cl⁻ shares electrons to form bonds, this statement is true.

Also, the statement saying that Na⁺ cation is formed by the losing of one electron by Sodium. It is true.

Because sodium is a metal, it loses an electron and chlorine is a non-metal, it gains an electron so that they both can form a bond between the, share there electrons and form a stable compound.

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The formula s = -iCRT can be used to compute solute potential. As long as there are solutes in solution, the solute potential is negative. I denotes the number of ions into which the solute dissociates (or breaks apart).

The lower the solute potential, the more ions the solute can break down into. = S + P is the formula for computing water potential. The osmotic potential is proportional to the concentration of the solute. When the solute concentration of a solution increases, the potential for osmosis of the water in that solution diminishes. The change in mass and molarity of sucrose have a direct proportional relationship because as the amount of sucrose in the dialysis bag grows, so does the change in mass.

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answer:pubchem or potassium iodate

Question: What is the name of KIO3?

Answer: Goodmorning: }  The name for KIO3 is  Potassium iodate | KIO3 - PubChem.

Explanation: Potassium Iodate tablets are used at the time of a nuclear emergency; the tablets stop the thyroid gland (situated in your neck) taking up radioactive iodine, which may be released into the environment following a nuclear accident.

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Answer:

6

Explanation:

there always has to be the same number of atoms on both sides of the equation

Divers are most at risk when they return to the surface due to the decreased solubility of nitrogen gas in the blood.

In the reaction, the acid is H₂Se, the base is H₂0, the conjugate acid is H₃O⁺, and the conjugate base is SeH.

Increasing the concentration of HA will increase the number of red (H₃O⁺) and blue (A⁻) particles in the solution in chemical equilibrium.

Divers are individuals who dive to great depths in the oceans.

Divers may dive freely without extra gas cylinders or they may dive with gas cylinders containing a mixture of oxygen and nitrogen.

Since gas solubility increases with pressure and decreases with pressure, nitrogen gas bubbles form as divers surface from the depths.

2. Acids are substances that donate protons, whereas bases accept protons.

Conjugate acids are formed when acids donate protons, whereas conjugate bases are formed when bases accept protons.

3. The equation of the reaction is given below:

According to the principle of chemical equilibrium, equilibrium will shift to a position that annuls any constraint placed on the system in equilibrium.

Therefore, increasing the concentration of Ha will result in an increase in H₃O⁺ and A⁻ particles in the solution.

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Answer:

solid: Relatively rigid, definite volume and shape. In a solid, the atoms and molecules are closely bonded that they vibrate in place but don't move around. liquids: Definite volume but able to change shape by flowing. In a liquid, the atoms and molecules are loosely bonded.

Explanation:

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A mixture of gases contains 12. 0 grams of n2 and 15. 0 grams of ar, under a total pressure of 1. 32 atm. What is the partial pressure of n2?.

The partial pressure of n2 in the mixture of above gases is 0.7atm.

What is partial pressure?

Each gas in a mixture of gases has a partial pressure, which is the pressure that would exist if that gas alone had filled the complete volume of the original mixture at the same temperature.

N=12.0, Ar=15.0

Total pressure=1.32

Partial pressure of n2=?

WN2=12.0

WAr =15.0

nN2=12/28 =0.42

nAr=15/40 =0.37

Xn2=0.42/0.42+0.37 =0.53

Pn=Xn2×Ptotal

=0.53×1.32=0.69atm that ie nearly equal to 0.7atm

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Answer:

3.39 mol

Explanation:

n = m/M, where n is moles, m is mass and M is molar mass.

n = 149/44.01

n = 3.38559418314 mol

n = 3.39 mol

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When calculating the number of neutrons you subtract the mass number from the atomic number?

Since the vast majority of an atom's mass is found its protons and neutrons, subtracting the number of protons (i.e. the atomic number) from the atomic mass will give you the calculated number of neutrons in the atom. In our example, this is: 14 (atomic mass) – 6 (number of protons) = 8 (number of neutrons).

A chemical element with the atomic number 4 and the symbol Be is known as beryllium. It is an alkaline earth metal that is steel-gray in color, tough, light, and brittle. It is a divalent element that only naturally occurs in minerals when combined with other elements. Beryl and chrysoberyl are well-known gemstones that contain a lot of beryllium.

Any element's atomic number indicates how many protons or electrons are found in that element.

Since beryllium has an atomic number of 4, it is obvious that it contains 4 protons and 4 electrons.

On the other hand, the mass number of an element denotes the total number of protons and neutrons that make up an element's atomic nucleus.

Since beryllium has a mass of nine, there are also nine protons and neutrons in its mass.

Thus, there are 9 - 4 = 5 neutrons in the system.

As a result, there are 4, 4, and 5 protons, electrons, and neutrons present in beryllium, respectively.

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CH3CH CH3 ch2ch2ch3 stand for Five carbon atoms make up the longest carbon chain. A methyl group can be found at carbon-3 as well. Thus, 3-methylpentane is its IUPAC designation.

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E = h v, where E is the energy (in SI units of J), h is the Planck constant (h = 6.626 x 10-34 J s), and is the frequency of the radiation, gives the energy associated with a single photon (SI units of s–1 or Hertz, Hz)

One photon's energy (E) is (6.626 x 10(-34)Js) x (5x x 10(10)s) s(-1) ` '=33.1 xx 10^(-24)J'  Energy of a single mole of photons is equal to "Energy of a single photon" x "Avogardro's number of photons" It reads "=(33.1 xx10(-24)J)xx (6.022 xx 10(23))=19.93J".

Radiation can be thought of as either waves or as discrete particles known as photons. A single photon's energy is given by the formula E = hv, where E is its energy (measured in SI units of J), h is Planck's constant (6.626 x 10-34 J s), and ∨ is the radiation's frequency (measured in SI units of s-1 or Hertz, Hz) (see figure below).

Wavelength and frequency are connected by the formula λ = c/∨, where c is the speed of light, which is 2.998 x 108 m s-1. Wavenumber, or σ = 1/λ, is another quantity that you will frequently see. It is typically expressed in units of cm-1.

A single photon with wavelength has the following energy:

E = (hc / λ) = (1.983 x 10 ^(-16) J nm/photon) / λ

Em = (hcNa / λ) = (1.196 x 10^8 J nm/mol)/λ

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The two liquids being measured when obtaining an absorbance spectrum are called the absorbance (A) and the transmittance (T) solutions.

Absorbance is measured using a spectrophotometer or microplate reader, that's an device that shines light of a special wavelength via a sample and measures the quantity of mild that the pattern absorbs.

Absorption spectra (additionally called UV-Vis spectra, absorbance spectra and electronic spectra) display the change in absorbance of a sample as a characteristic of the wavelength of incident light, and are measured the usage of a spectrophotometer.

Definition of absorption spectrum: an electromagnetic spectrum wherein a decrease in depth of radiation at precise wavelengths or ranges of wavelengths characteristic of an soaking up substance is manifested specially as a sample of darkish lines or bands.

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Option A is correct. a standard comparison of measurements. Regardless of precision and accuracy, all measurements are subject to some degree of uncertainty.

This is due to two things: the measuring device's limitations (systematic error) and the measurement skills of the experimenter (random error). A variance or its square root, which is a standard deviation, is used to measure uncertainty. The term "standard error" is also (and more frequently) used to refer to a statistic's standard deviation. Variability leads to the emergence of uncertainty. The standard deviation serves as the foundation for the definition of standard uncertainty, which is represented by a small u. Here, it's important to emphasize three key aspects of standard uncertainty: Even for non-normally distributed quantities, the standard deviation can be calculated.

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concept employed

According to the Bohr model, electrons orbit the nucleus at constant energies. Higher energy levels are present in orbits that are farther from the nucleus. Light is released as energy when electrons drop to a lower energy level.

1) With electron energy levels specified by the formula -k/n2, where k is a constant and n is the primary quantum number of the specific level the electron is occupying (usually, ground state, unless perturbed).

2) Assume that the electron in this problem is being moved between the three numbered energy levels; otherwise, you would need to use the additional data that E1 = -13.6 eV. However, since you were unaware of this, the energy levels of the electron must have been clearly defined.

3) The variations in the energies of those energy levels are represented by the wavelengths of the absorbed and emitted light. The n1 level has energy 1/n12, and the n2 level has energy 1/n22, assuming the ground state has reference energy of 1/12 (omit the minus sign for convenience throughout).

4) Now, simply translate the two energy changes into ratios: The ratio is reversed in relation to the corresponding energy level differences for 388.8/94.57nm since the energies are reciprocal to the wavelengths = 3.87142 = (1-1/n1^2)/(1/n1^2 - 1/n2^2 ) . All that remains is more algebraic labor; first, create the common denominators, and then eliminate all of the (n1 + n2) common denominators. Thus, n22*(n12 -1) / (n22 - n12) = 3.87142 is obtained.

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Answer:

the fish is the organism that evolved last