If a sound wave refracts, what happens to it? Select all that apply.
It changes its speed and wavelength when it bounces off of a solid surface.
B
It changes direction when it passes through an opening
С
It changes its speed and wavelength when it passes through an opening
D
It changes direction when it passes from one medium to another
E
It changes its speed and wavelength from one medium to another.
F
It changes direction when it bounces off of a solid surface.

Answer:

Oceans, Fossil fuels, atmosphere

Answer:

Mixtures are one product of mechanically blending or mixing chemical substances such as elements and compounds, without chemical bonding or other chemical change, so that each ingredient substance retains its own chemical properties and makeup.

An infrared wave has a wavelength of 0.00005 m. this wavelength in scientific notation is 5.0 × 10⁻⁵ m.

Scientific notation is also called as standard form. Scientific notation is used to express the number that is too large number  or too small is  convenient written in a decimal form. scientific notation contains two part decimal number multiply power of 10.

given data is as follows :

infrared wave has wavelength = 0.000005 m

the scientific notation of the wavelength given is = 5.0 × 10⁻⁵ m

Thus, An infrared wave has a wavelength of 0.00005 m. this wavelength in scientific notation is 5.0 × 10⁻⁵.

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Answer:12j

Explanation:

The average kinetic energy of an object's particles is thermal energy and the correct option is option 2.

The energy associated with an object’s motion is called kinetic energy.

In chemistry, kinetic energy is the energy associated with the constant, random bouncing of atoms or molecules.

Thermal energy and temperature are closely related. Both reflect the kinetic energy of moving particles of matter. However, temperature is the average kinetic energy of particles of matter, whereas thermal energy is the total kinetic energy of particles of matter.

The greater the motion of particles, the higher a substance’s temperature and thermal energy.

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Answer:

Isotopes.

Explanation:

Atoms of the same element that have different numbers of neutrons but the same number of protons are called Isotopes.

Answer:

(Physical or Chemical) properties of a substance can easily be observed. … (Physical or Chemical) properties can be used to identify substances. physical property. Oxygen is odorless and colorless.

Explanation:

a. The number of grams of sodium oxide produced by 100 g Na would be 134.85 grams while the amount produced by 60 g oxygen would be 232.5 grams.

b. The mass of excess reactant left over at the conclusion of the reaction would be 24.624 grams of oxygen.

The unbalanced equation goes thus: \(Na + O_2 -- > Na_2O\)

First, we need to balance the equation of the reaction. This balanced equation is written as:

\(4 Na + O_2 -- > 2Na_2O\)

From the equation:

With 100 g Na:

Mole = 100/23

        = 4.35 moles

Equivalent mole of \(Na_2O\) = 4.35/2

                                          = 2.175 moles

Mass of 2.175 moles of \(Na_2O\) = 2.175 x 62

                                                 = 134.85 grams

Thus, 134.85 grams of \(Na_2O\) will be produced with 100g of Na.

With 60 g of oxygen:

Mole = 60/32

        = 1.875 moles

Equivalent moles of \(Na_2O\) = 1.875 x 2

                                           = 3.75 moles

Mass of 3.75 moles \(Na_2O\) = 3.75 x 62

                                           = 232.5 grams.

Thus, 232.5 grams of \(Na_2O\) will be produced with 60 g of oxygen.

To get the excess reactant:

Mole of 100 g Na = 4.35 moles

Mole of 60 g oxygen = 1.875 moles

Mole ratio of Na to oxygen = 4:1

Thus the excess reactant is oxygen.

Actual amount of oxygen = 4.35/4

                                           = 1.0875 moles

Excess mole of oxygen = 1.857 - 1.0875

                                       = 0.7695 moles

Mass of excess oxygen = 0.7695 x 32

                                       = 24.624 grams

Thus, the mass of the excess reactant left over after the conclusion of the reaction is 24.624 grams of oxygen.

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95.3 mL of 1.20 M \(Ca(OH)_2\)(aq) is needed to completely neutralize 142. mL of 0.808 M \(HClO_4\)(aq).

What is Neutralize?

Neutralization is a chemical reaction that occurs when an acid and a base react with each other to form a salt and water. The acid donates hydrogen ions (H+) while the base donates hydroxide ions (OH-). The H+ ions combine with the OH- ions to form water (H2O), leaving behind the salt. The process results in a solution that is neutral in pH because the acidic and basic properties have been neutralized.

First, we need to calculate the amount of substance of\(HClO_4\):

n(\(HClO_4\)) = C(\(HClO_4\)) × V(\(HClO_4\)) = 0.808 mol/L × 0.142 L = 0.1149 mol

Next, we can use the formula above to calculate the amount of \(Ca(OH)_2\)needed:

n(\(Ca(OH)_2\)) = n(HClO4)/2 = 0.05745 mol

Finally, we can use the concentration and the amount of substance to calculate the volume of Ca(OH)2 solution needed:

V(\(Ca(OH)_2\)) = n(\(Ca(OH)_2\))/C(\(Ca(OH)_2\)) = 0.05745 mol/1.20 mol/L = 0.0479 L = 47.9 mL

Therefore, 95.3 mL of 1.20 M \(Ca(OH)_2\)(aq) is needed to completely neutralize 142. mL of 0.808 M \(HClO_4\)(aq).

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The volume, in the mL, of the 1.20 M Ca(OH)₂(aq) is needed to the complete neutralization of the 142. mL of the 0.808 M HClO₄(aq) 95.61 mL.

The molarity of the solution, M₁ = 0.808 M

The volume of the solution, V₁ = 142 mL

The molarity of the solution, M₂ = 1.20 M

The volume of the solution, V₂ = ?

The neutralization expression is as :

M₁ V₁ = M₂ V₂

V₂  = M₁ V₁ / M₂

Where,

M₁ = 0.808 M

V₁ = 142mL

M₂ = 1.20 M

V₂  = ( 0.808 × 142 ) / 1.20

V₂  = 95.61 mL

The  volume of the Ca(OH)₂ needed for the neutralization is the 95.61 mL.

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Answer:

um i think 20

Explanation: because 20

Answer: Handwashing. It is estimated that washing hands with soap and water could reduce diarrheal disease-associated deaths by up to 50% 1. Researchers in London estimate that if everyone routinely washed their hands, a million deaths a year could be prevented 2.

Explanation:

Answer Electromagnetic waves are used to transmit long/short/FM wavelength radio waves, and TV/telephone/wireless signals or energies. They are also responsible for transmitting energy in the form of microwaves, infrared radiation (IR), visible light (VIS), ultraviolet light (UV), X-rays, and gamma rays.

Explanation:

Electromagnetic waves are important in society today because they are used to "transmit long/short/FM wavelength radio waves, and TV/telephone/wireless signals or energies. They are also responsible for transmitting energy in the form of microwaves, infrared radiation (IR), visible light (VIS), ultraviolet light (UV), X-rays, and gamma rays."

2. The interaction involved in the B⁺-decay is known as beta decay.

3.  The conserved quantities in the reaction are:

The quark flavor is not a conserved quantity in the given reaction of B⁺-decay.

The B⁺-decay is a type of beta decay, specifically beta plus decay. In beta plus decay, a proton (p) decays into a neutron (n), emitting a positron (e+) and an electron neutrino (νe):

p → n + e⁺ + νe

2. The interaction involved in the B⁺-decay is the weak nuclear force. The weak force is responsible for processes involving the transformation of particles, such as the conversion of a proton into a neutron in this case.

The interaction involved in the B⁺-decay is known as beta decay. Specifically, the B⁺-decay refers to the decay of a positively charged (B⁺) meson, which is a type of subatomic particle.

3. The conserved quantities in the reaction are:

Conservation of electric charge: The total charge on both sides of the reaction is conserved. The proton (p) has a charge of +1, while the neutron (n) has no charge. The positron (e⁺) has a charge of +1, which balances out the charge.

Conservation of lepton number: The total lepton number is conserved in the reaction. The lepton number of the proton and neutron is 0, while the lepton number of the positron and electron neutrino is also 0. Hence, the lepton number is conserved.

Conservation of baryon number: The baryon number is conserved in the reaction. The baryon number of the proton is 1, and the baryon number of the neutron is also 1. Therefore, the total baryon number is conserved.

Regarding quark flavor, it is not conserved in the B⁺-decay. The decay process involves the transformation of a up-type quark (u) in the proton to a down-type quark (d) in the neutron. This change in quark flavor is allowed by the weak force.

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Answer:Atomic radius gets bigger

Explanation:

Atomic radius bigger because not only do the atoms have more and more protons and neutrons, and thus more mass in general, there is also stronger shielding affect. Shielding affect is when electrons closer to the nucleus block the positive charge from reaching electrons farther from the nucleus, and thus those far electrons are not drawn towards the nucleus as strongly, and spread out more, increasing atomic radius.

Answer:

0.111

Explanation:

Step 1: Calculate the moles corresponding to 23.2 g of ethanol

The molar mass of C₂H₅OH is 46 g/mol.

23.2 g × 1 mol/46 g = 0.504 mol

Step 2: Calculate the moles corresponding to 73.1 g of water

The molar mass of H₂O is 18 g/mol.

73.1 g × 1 mol/18 g = 4.06 mol

Step 3: Calculate the total number of moles

n = nC₂H₅OH + nH₂O = 0.504 mol + 4.06 mol = 4.56 mol

Step 4: Calculate the mole fraction of ethanol

We will use the following expression.

Χ(C₂H₅OH) = nC₂H₅OH / n

Χ(C₂H₅OH) = 0.504 mol / 4.56 mol = 0.111

Answer:

b

Explanation:

According to the graph, only the reactant A was present at the beginning of the reaction.

The graph shows the concentration for the reactant A and the product that is A2. In this graph, the concentration is displayed on the vertical axis, while the horizontal axis shows the time.

In general terms, it can be observed that at the beginning only the reactant A is present, but as the reaction occurs the concentration of this reactant decreases, while the concentration of the product A2 increases.

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The states of matter in which water exists are determined by the temperature and pressure of its environment.

Water can exist in three different states of matter - solid, liquid, and gas. When water is at a temperature below 0 degrees Celsius and at atmospheric pressure, it freezes and turns into a solid state, commonly known as ice. When the temperature of the water is above 0 degrees Celsius but below 100 degrees Celsius, it exists in its liquid state. This state of matter is the most common and familiar to us, as it is the form in which we typically use and consume water. When water is heated above 100 degrees Celsius, it turns into its gaseous state, which is commonly known as steam. Therefore, the states of matter in which water exists are determined by the temperature and pressure of its environment.

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Answer:

D. The pressure of the gas on the left would double because the number of collisions would also double.

Explanation:

According to Boyle’s law, the pressure of a gas is inversely proportional to its volume.

As the number of particles was doubled in the left box, the particles have less space for movement as the volume occupied by gas particles has decreased and it will lead to the collision of gas particles with the walls of the container.

As the volume decreases as gas particles were doubled and so the pressure of the gas on the left would double.

Hence, the correct answer is "D. The pressure of the gas on the left would double because the number of collisions would also double."

Phenylacetic acid (C₆H₅CH₂COOH) reacts with different reagents to form various products. The reactions with NaHCO₃, NaOH, SOCl₂, and NaCl result in different products or no reaction, depending on the specific conditions.

a. NaHCO₃ (sodium bicarbonate): Phenylacetic acid reacts with sodium bicarbonate in the presence of water to form phenylacetic acid sodium salt (C₆H₅CH₂COONa), carbon dioxide (CO₂), and water (H₂O) as products.

b. NaOH (sodium hydroxide): Phenylacetic acid reacts with sodium hydroxide to form phenylacetate ion (C₆H₅CH₂COO⁻) and water (H₂O) as products.

c. SOCl₂ (thionyl chloride): Phenylacetic acid reacts with thionyl chloride to form phenyl acetyl chloride (C₆H₅CH₂COCl) and sulfur dioxide (SO₂) as products.

d. NaCl (sodium chloride): Phenylacetic acid does not react with sodium chloride, as it is an inert salt and does not undergo any chemical reaction with phenylacetic acid.

The specific products formed in these reactions depend on the conditions and reagents used, and may further react or undergo additional transformations depending on the reaction conditions and other factors.

It is important to carefully follow proper laboratory procedures and use appropriate protective measures when working with chemicals.

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Explanation:

HOPE IT WILL HELP YOU TO SOLVE YOUR PROBLEM

The molecular formula for a compound that is 33.38% sulfur and 66.62% oxygen and has a molar mass of 192.14 g is SO₄, and the molecular formula for a compound that is 26.37% carbon, 5.541% hydrogen, 52.70% oxygen, and 15.38% nitrogen and has a molar mass of 182.16 g is C₉H₈NO₃.

The molecular formula of a compound is a way to represent the number and types of atoms that make up a molecule and is used to identify and distinguish between different compounds, which is important in chemistry and biochemistry as it can help predict the compound's physical and chemical properties.

Hence, the molecular formula for a compound that is 33.38% sulfur and 66.62% oxygen and has a molar mass of 192.14 g is SO₄, and the molecular formula for a compound that is 26.37% carbon, 5.541% hydrogen, 52.70% oxygen, and 15.38% nitrogen and has a molar mass of 182.16 g is C₉H₈NO₃.

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Polarization diagrams are constructed to examine the behaviour of a metal in the presence of an electrolyte in order to understand the impact of various factors on the corrosion rate and corrosion potential. Let us examine the impact of each of the factors on the corrosion rate and corrosion potential of a metal M corroding to dissolved M in an acid solution under activation control with other parameters constant:

(a) The anodic reaction's increase in ip- Increasing ip of the anodic reaction decreases the anodic. Tafel slope and shifts the anodic Tafel line to the right and up. It results in a greater corrosion rate but no effect on the corrosion potential. The cathodic reaction is unaffected. Therefore, the metal's corrosion rate is increased, but the corrosion potential is not affected.

(b) Increasing io of the cathodic reaction - Increasing io of the cathodic reaction increases the cathodic Tafel slope and moves the cathodic Tafel line to the left and down. The corrosion potential decreases, but there is no effect on the corrosion rate. The anodic reaction is unaffected. Therefore, the corrosion potential decreases, but the corrosion rate remains unchanged.

(c) Increasing the concentration of dissolved H - Increasing the concentration of dissolved H raises the equilibrium potential of the cathodic reaction. The anodic reaction is unaffected. There is no effect on the corrosion rate, but the corrosion potential shifts to a more noble (positive) value.

(d) Increasing the Tafel constant of the anodic reaction - An increase in the Tafel constant of the anodic reaction decreases the anodic Tafel slope and shifts the anodic Tafel line to the right and up. There is no effect on the cathodic reaction. As a result, the corrosion rate increases, but the corrosion potential remains unchanged.

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Answer:

Ice

Explanation:

its sooooooooooo easy

When liquid water is cooled, it contracts like one would expect until a temperature of approximately 4 degrees Celsius is reached. After that, it expands slightly until it reaches the freezing point, and then when it freezes it expands by approximately 9%.

3.6 ×10²⁴ atoms fluorine are in 410 g of UF\(_6\). Fluorine is an atomic number 9 chemical element with both the symbol F.

Fluorine is an atomic number 9 chemical element with both the symbol F. This is the smallest halogen as well as occurs as a very poisonous, pale yellow diatomic vapor under normal circumstances.

It is exceptionally reactive being the most electronegative active catalyst, reacting with all other elements save the light inert.

mole =  410 / 352.02 =1.16mole

number of atom= 1.16× 6.022×10²³=6.98×10²³

number of atom of fluorine =6× 6.98×10²³= 3.6   ×10²⁴ atoms

Therefore, 3.6 ×10²⁴ atoms fluorine are in 410 g of UF\(_6\).

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A quantity of the original isotope (18) is kept. A particular radioactive isotope's half-life is constant; it is unaffected by environmental factors and is unrelated to the starting concentration of that isotope.

These isotopes emit alpha, beta, and gamma rays as a result of their radioactive decay. A decay chain starts with a parent isotope.

The radioactive decay of parent isotopes yields daughter isotopes. Although reactions occasionally produce stable daughter isotopes, they are typically unstable and radioactive, which promotes the progression of decay chains.

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Answer:

you shoudl ask this question more clearly?

Explanation:

Answer:

The 20th Element is Calcium (Ca).

The 20 Elements are:

Hydrogen

helium

lithium

berilium

boron

carbon

nitrogen

oxygen

flourine

neon

sodium

magnesium

aluminium

silicon

phosphorus

sulphur

chlorine

argon

potassium

calcium

Lindane (hexachlorocyclohexane) is an agricultural insecticide that can also be used to treat head lice. The lowest energy chair conformation of lindane is a slightly puckered chair conformation, which is a six-membered ring of alternating single and double bonds.  The hydrogen atoms are positioned in an axial orientation and the chlorine atoms are in an axial orientation.
Lindane (hexachlorocyclohexane) is an agricultural insecticide that can also be used in the treatment of head lice. The lowest energy chair conformation of lindane isThe lowest energy chair conformation of lindane is the one with the Cl atom and the H atom in equatorial positions. The molecule of lindane consists of six carbon atoms joined together in the form of a ring.Each carbon atom is attached to one hydrogen atom and one chlorine atom. The relative orientations of the C-H and C-Cl bonds determine the conformation of the molecule. The ring can assume various conformations, and the lowest energy conformation is the most stable. The conformation of the molecule can be analyzed by assigning axial and equatorial positions to the atoms on the carbon ring. In the axial position, the atoms are oriented perpendicular to the ring. In the equatorial position, the atoms are oriented at an angle of 120° with respect to the ring. The axial orientation is less stable than the equatorial orientation because the axial atoms experience steric hindrance from the other atoms on the ring. The steric hindrance is reduced in the equatorial orientation, and this results in a lower energy conformation. Thus, the lowest energy chair conformation of lindane is the one with the Cl atom and the H atom in equatorial positions.

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