Answer:
Light changes speed in a glass of water.
Explanation:
What is the name of an isotope that has 14 protons and 14 neutrons?
The name of an isotope that has 14 protons and 14 neutrons is Silicon-28
The total number of protons and neutrons in an isotope's nucleus is referred to as the mass number. This is due to the fact that each proton and neutron has a mass of one atomic mass unit.
We may get the mass of the atom by multiplying the total number of protons and neutrons by 1 amu.
The atomic number Z is 14 if there are 14 protons. Z being the quantity of large positively charged nuclear particles by definition.
Silicon is what we have if Z is the atom's identity and Z=14. The isotope of the element is 28S because the element may contain more or fewer neutrons than Z, where neutrons are heavy, neutrally charged nuclear particles.
Silicon-28 is the isotope with 14 protons and 14 neutrons.
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Ethanol (C2H5OH) melts a - 144 oC and boils at 78 °C. The enthalpy of fusion of ethanol is 5. 02 kj/mol, and its enthalpy of vaporization is 38. 56 kj/mol. The specific heats of solid and liquid ethanol are 0. 97j/g - k and 2. 3 j/g - K, respectively.
(a) How much heat is required to convert 42. 0 g of ethanol at 35 °C to the vapor phase at 78 °C?
(b) How much heat is required to convert the same amount of ethanol at - 155 oC to the vapor phase at 78 °C?
According to the given statement a) 39.367kJ heat is required AND b) 62.3kJ heat is required.
What are a molar mass and a mole?One mole of a chemical is equal to 6.022 x 1023 particles (or formula units) (ionic compound). The molar mass of a reagent is the amount of 1 mole of that chemical. In put it another way, it gives you the amount of grams per molecule of a material.
Heat required to convert 42.0 g of ethanol at 35 °C to the vapor phase at 78 °C can be calculated by;
H = mcθ + mL
m = mass of ethanol
c = specific heat capacity of ethanol
θ = temperature change
L = Latent heat of vaporization of ethanol
Adding values;
H = (42 × 2.3 × (78 - 35)) + (42/46 × 38.56 × 10^3)
H = 4154 + 35207
H = 39.367 kJ
b) Heat required to convert the same amount of ethanol at - 155°C to the vapor phase at 78 °C;
H = mLfus + mcθ + mLvap
H = (42/46 × 5.02 × 10^3) + (42 × 2.3 × 78 - (- 155)) + (42/46 × 38.56 × 10^3)
H = 4583 + 22508 + 35207
H = 62.3 kJ
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Cleaning lady to leading lady
Q 1) what are soname's dearest wishes for the future.
Subject: english
Soname's dearest wishes for the future are to become a successful leading lady and to continue to use her talents and passions to inspire and empower people.
She also hopes to continue to learn, grow, and make a positive impact on the world. Soname dreams of financial stability and security so that she can continue to provide for her family and be an example for her community. She wishes to continue to build a successful career in entertainment, both on and off screen, and to be an example of success for her peers.
Lastly, she wishes to use her voice and platform to advocate for social justice and to make a difference in the world. Soname has a strong desire to make a lasting impact and to leave a legacy that she can be proud of. She is determined to use her hard work and determination to make her dreams come true and to make the world a better place.
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What is the term for evaluation of work by others in the same field? group work peer review collaboration
Answer:
the answer is peer review!
Explanation:
A chemist dilutes 8.4 L of concentrated CaO solution to 40. L volume with a concentration of 0.65 MCQ What was the original solutions M₁V₁= M₂V2
Answer:
The original solution’s concentration was 3.09 M.
Explanation:
Dilution is the reduction of the concentration of a chemical substance in a solution, and consists simply of adding solvent to an existing solution.
The quantity or mass of the solute is not changed but only that of the solvent. That is, as only solvent is being added, the consequence is that by not increasing the amount of solute but if the amount of solvent, the concentration of the solute decreases.
A dilution is expressed as:
Cinitial*Vinitial = Cfinal*Vfinal
In this case:
Cinitial= ?Vinitial= 8.4 LCfinal= 0.65 MVfinal= 40 LReplacing:
Cinitial*8.4 L = 0.65 M*40 L
Solving:
[tex]Cinitial=\frac{0.65 M*40 L}{8.4 L}[/tex]
Cinitial= 3.09 M
The original solution’s concentration was 3.09 M.
What is the mass of 2.80 x 10 ^23 molecules of CO2?
The answer is 20.46g.
As we know that
1 mole of CO2 has 6.02 x 10^23 molecules of CO2.
Now, let's say x moles of CO2 has 2.80 x 10^23 molecules of CO2.
Therefore,
x = 2.80 x 10^23 / 6.02 x 10^23 = 0.465
As, M = nmr
M = 0.465 *( 12 + 2x16)
= 0.465 *( 12 + 32)
= 0.465 * 44
= 20.46g
What is a chain reaction?
Responses
a chemical reaction in which the products link together and form a long chain
a chemical reaction in which the products link together and form a long chain
a chemical reaction which proceeds quickly and produces a great deal of energy
a chemical reaction which proceeds quickly and produces a great deal of energy
a process where the products released in one reaction are the stimuli and reactants for another reaction
a process where the products released in one reaction are the stimuli and reactants for another reaction
a process where the reactants used in one reaction are the products for another reaction
a process where the reactants used in one reaction are the products for another reaction
please hurry
Answer:
a process where the products released in one reaction are the stimuli and reactants for another reaction
Explanation:
A chemical reaction is described as a process in which the products promote or spread the reaction, which may accelerate dramatically under certain conditions.
Answer: chain reaction
Explanation: a chain reaction is a series of chemical reactions where the products of the reaction contribute to the reactants of another reaction. as a series of events that are each caused by the previous event. If a trash can falls over and this scares a cat who then jumps and knocks over a glass of water, thats a chain reaction. The trash can fall is the initial event, and the end result is the glass getting knocked over.
-Identify the following whether it is Physical or Chemical change.
1. freezing
6. burning of paper
2. burning wood
7. digestion of food
3. melted ice cream
8. evaporation
4. boiling water
9. sublimation
5. condensation
10. Exploding firecrackers
My answers are by the way they are written p-phy c-che
pcccpppppcWhich one of the following combinations of names and formulas of ions is incorrect? a. CIO 3 chlorate b. HCO 3 hydrogen carbonate c. NO 2 nitrate
Nitrate NO 2 It is inappropriate to use one of the following ions' names and formulas.
Chlorate's purpose is unknown.Herbicides, explosives, defoliants, paper, leather, dyes, matches, and inks are all made from it. It's also used to make cosmetics and medications. An inorganic salt of sodium with the counter-ion chlorate is known as sodium chlorate. It serves as both a herbicide and an oxidizing agent for bleaching paper.
Where can you find chlorate?Chlorate, an anion, can enter drinking water through a number of different causes, such as the use of hypochlorite or chlorine dioxide as disinfectants, the oxidation of hypochlorite or chlorite by ozone, and pesticide runoff or paper mill discharges that contaminate the source water.
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Which of the following elements when the central atom could exhibit sp 3 d 2 hybridization?
C, S, N, B
in the given following elements when the central atom could exhibit sp 3 d 2 hybridization , Sulphur(S) can exhibit the asked configuration.
Z=16 for Sulphur
Electronic configuration [tex]1S^{2} 2S^{2} 2P^{6} 3S^{2} 3P^{2} 3D^{0}4S^{0}[/tex] here we can clearly see that the energy difference between the 3p and 3d shell is very so sulphur can exhibit the asked configuration.
Z=6 for Carbon C - [tex]1S^{2} 2S^{2} 2P^{2}[/tex]
Z=7 for Nitrogen N- [tex]1S^{2} 2S^{2} 2P^{3}[/tex]
Z=5 for Boron B- [tex]1S^{2} 2S^{2} 2P^{1}[/tex]
Here we can clearly see that the atom is very small d the shell is not present in the configuration above also the energy difference between the shells will be high as they are close to the nucleus hence the asked configuration can not be exhibited.
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If you double the total amount of Na ions, but you also double the amount of water they are dissolved in, __________.
Na ion concentration will remain constant if you increase the overall number of Na ions while also increasing the volume of water in which they are dissolved.
The amount of material in a certain area is referred to as concentration in chemistry. Another definition states that concentration is the ratio of a solution's solute to its entire solution or solvent. Mass per unit volume is a common way to express concentration. However, moles or units of volume can also be used to express the solute concentration. Concentration could be per unit mass instead of volume. Concentration can be computed for any mixture, despite often being used with chemical solutions.
By mathematically dividing the mass, moles, or volume of the solute by the mass, moles, or volume of the solution, one may calculate the concentration (or, less commonly, the solvent).
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Acids such as HNO3, or H2SO4, which contain oxygen,
hydrogen and other elements are called
Answer:
oxoacids
Explanation:
Acids such as HNO3, H2SO4, which contain oxygen, hydrogen, and other elements are called oxoacids
Sort the following phrases as descriptions of alpha helices, beta turns or all alpha Helices 1st residue hydrogen- bonded to 5^th residue (that is, residue n is H- bonded to residue n + 4) all - NH groups point in the same direction Beta Sheets successive R groups point in opposite directions Beta Turns 1^st residue (that is, residue n is H- bonded to residue n+3 All contains-NH hydrogen bonded to C = O
An alpha helix is a type of secondary structure in proteins. It is a right-handed, coiled-coil structure that is stabilized by hydrogen bonds between the peptide backbone amide nitrogen and carbonyl oxygens of every fourth residue.
1st residue hydrogen-bonded to 5th residue (that is, residue n is H-bonded to residue n+4) - Alpha Helix
All NH groups point in the same direction - Beta Sheet
successive R groups point in opposite directions - Beta Sheet
1st residue (that is, residue n is hydrogen bonded to residue n+3) - Beta Turn
All contains-NH hydrogen bonded to C=O - Alpha Helix
In summary, the first phrase describes an Alpha Helix, the second and third phrases describe Beta Sheets, and the fourth phrase describes a Beta Turn, the fifth phrase also describes an Alpha Helix.
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The density of ________ is 0.900 g/L at STP? a) CO
b)CH4
c) NO
d) Ne
e) N2
Answer:ne
Explanation:
3) Which of the following is a true statement?
A: Ice cannot float on water.
B: Carbon is a part of the compound of water.
C: Water is a universal solvent.
D: Hard water is good for making soap lather.
PLS HELP ME PLS
Water is called a ‘universal solvent' because water can dissolve much more substances than any other liquid found in nature but water cannot dissolve every substance.
Is water called universal solvent?Water is referred to as a "universal solvent" because it has a considerably wider range of natural solvent properties than any other liquid. However, water is not capable of dissolving all compounds.
For instance, water cannot dissolve hydroxides, fats, or waxes because oppositely charged particles are not very soluble in water. Hydrogen and oxygen atoms are arranged polarly in water molecules.
The oxygen atom has a negative charge, while the hydrogen atom on one side has a positive charge.The water molecule can more easily attach to various compounds thanks to these charges.
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Because it can dissolve a greater variety of chemicals than any other natural liquid, water is referred to as a "universal solvent," though it does not dissolve all substances. The option C is true.
The term "universal solvent" refers to water.In comparison to other liquids, water has a much larger spectrum of natural solvent qualities, earning it the moniker "universal solvent". Nevertheless, not all substances can be dissolved by water.
Because water is not highly soluble in oppositely charged particles, it cannot dissolve hydroxides, fats, or waxes, for example. Water molecules have polar arrangements of the hydrogen and oxygen atoms.
In contrast to the hydrogen atom on one side, which has a positive charge, the oxygen atom has a negative charge.
These charges allow the water molecule to more readily bind to different substances.
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What are the 3 steps for treating a chemical burn?
Remove dry chemicals. Remove contaminated clothing or jewelry. Bandage the burn. Rinse again if needed.
A chemical burn is infection and destruction of human tissue because of exposure to a chemical, generally with the aid of direct contact with the chemical or its fumes. Chemical burns can occur in the domestic, at work or school, or as a result of an twist of fate or assault. although few humans in the united states of america die after contact with chemical substances in the home, many substances not unusual in both living and garage areas can do extreme damage.
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Why is group 17 more reactive than Group 16?
The group 17 elements need only one more electron to complete a full octet since they already possess seven valence electrons. whereas group 16 elements needs 2 more electrons that why group 17 more reactive than Group 16
Because they easily acquire an electron to complete their outermost shell, halogens were highly reactive. Since they easily shed the solitary electron in their outermost shell, alkali metals were very reactive.
Since they easily acquire an electron to complete their outermost shell, halogens were highly reactive. Although they easily lose the lone electron within their outermost shell, alkali metals were highly reactive.
Group 17 elements occur only require one electron, therefore they can easily borrow an electron from another element to achieve a stable configuration for a noble gas. They were hence very reactive as well as will rapidly receive an electron to complete their outermost shell.
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How does atomic number affect properties?
The atomic number is the number of protons in the nucleus of an atom and it directly affects the properties of an element. The atomic number also determines the element's place in the periodic table, which allows us to predict the properties of an element based on its atomic number.
As the atomic number increases, the number of protons in the nucleus increases and so does the atomic number. This increase in protons also increases the number of electrons in the atom. The number and arrangement of electrons in an atom directly affect its chemical behavior and thus the properties of the element.
The atomic number also determines the element's position on the periodic table, and elements with similar atomic numbers have similar chemical and physical properties. For example, elements in the same vertical row (group) have similar chemical properties, and elements in the same horizontal row (period) have similar electronic configurations of their atoms.
The atomic number also affects the reactivity of an element. Elements with lower atomic numbers tend to be more reactive than elements with higher atomic numbers.
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The freezing of methane is an exothermic change. What best describes the temperature conditions that are likely to make this a spontaneous change
The correct answer is option C: Low temperature only, because entropy decreases during freezing.
When a substance changes from a gas to a solid, the entropy (measure of disorder) of the system decreases. This is because the solid has a more ordered structure than the gas. The decrease in entropy is accompanied by a decrease in temperature and an increase in enthalpy (heat content).For a process to be spontaneous, the entropy change must be positive, so the freezing of methane is spontaneous only if the temperature of the surroundings is lower than the temperature of the methane. Thus, the heat released from the exothermic process will be absorbed by the surroundings, the temperature of the methane will decrease, and the entropy of the system increases, driving the process towards completion.
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The complete question is :
Methane freezing is an exothermic process. Which of the following best describes the temperature conditions that are most likely to cause this spontaneous change? Because entropy increases during freezing, any temperature. Because entropy decreases during freezing, any temperature. Only at low temperatures because entropy decreases during freezing. Only at high temperatures, as entropy
How does a meter stick measure reaction time?
We can use the distance when the meter stick fell before you caught it to figure out your reaction time.
Meterstick is either a straightedge or foldable ruler which is used to measure a length, and is especially common in the construction industry. They are often made up of wood or plastic, and often have metal or plastic joints so that they can be folded together. Metersticks are usually divided with lines for each millimeter (1000 per meter) and numerical markings as per centimeter (100 per meter), with the numbers or either in centi- or millimeter.
Formula is the basis: d = 1/2 gt2. In this formula, “d” is equals to the distance the object fell, “g” equals to gravitational acceleration (9.8 m/s2), and “t” is the time the object was falling.
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A force of 180 N to the right and a force of 180 N to the left.
Answer:
180 N + 180 N = 360N
Explanation:
since they are all force of different side, you will add them.
A gas at 110 °C exerts a pressure of 225 torr in a sealed container. The temperature drops to 65 °C. What is the pressure of the gas at the cooler temperature?
According to Gay-Lussac's law, the pressure of the gas at the cooler temperature is 132.95 torr.
What is Gay-Lussac's law?It is defined as a gas law which states that the pressure which is exerted by the gas directly varies with its temperature and at a constant volume.The law was proposed by Joseph Gay-Lussac in the year 1808.
The pressure of the gas at constant volume reduces constantly as it is cooled till it undergoes condensation .
It is given as, P₁/T₁=P₂/T₂ , therefore P₂=225×65/110=132.95 torr.
Therefore,the pressure of the gas at the cooler temperature is 132.95 torr.
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Thiamine hydrochloride (vitamin B1 hydrochloride, HC12- H17ON4SCl2) is a weak acid with Ka 5 3. 4 3 1027. Sup- pose 3. 0 3 1025 g of thiamine hydrochloride is dissolved in 1. 00 L of water. Calculate the pH of the resulting solution. (Hint: This is a sufficiently dilute solution that the autoion- ization of water cannot be neglected. )
According to the given statement The pH of the resulting solution is 13.03.
How to calculate pH?To calculate the pH of the resulting solution, we need to know the concentration of the thiamine hydrochloride ions in the solution.
The Ka value of thiamine hydrochloride is 5.3 x 10^-27. Since thiamine hydrochloride is a weak acid, it dissociates in water according to the following equation:
HC12-H17ON4SCl2 (s) <-> H+ (aq) + C12-H17ON4SCl2- (aq)
The product of the acid and the base concentrations is equal to the acid dissociation constant (Ka)
H+(aq) * C12-H17ON4SCl2- (aq) = Ka
Molarity (M) = moles of solute/liters of solution
3.0 x 10^-25 g of thiamine hydrochloride is dissolved in 1.00 L of water. The molar mass of thiamine hydrochloride is 337.29 g/mol. So we can calculate the number of moles of thiamine hydrochloride in the solution.
moles = mass / molar mass
moles = 3.0 x 10^-25 / 337.29 = 8.94 x 10^-28
Molarity = moles / liters = 8.94 x 10^-28 / 1 = 8.94 x 10^-28 M
Now we can substitute the concentration of thiamine hydrochloride into the equation for the acid dissociation constant.
Ka = [H+] * [C12-H17ON4SCl2-]
Ka = (x)(x) = 8.94 x 10^-28
We know the Ka value and we know the concentration of thiamine hydrochloride ions. So we can use the Ka value and the thiamine hydrochloride concentration to calculate the concentration of H+ ions in the solution.
x^2 = 8.94 x 10^-28
x = √(8.94 x 10^-28)
x = 9.4 x 10^-14
[H+] = x = 9.4 x 10^-14 M
The pH of the solution is calculated by taking the negative log of the H+ concentration:
pH = -log(9.4 x 10^-14)
pH = 13.03
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Is there something wrong with the chemical equation shown? Look carefully at the equation. What would need to be done to this equation to make sure that it follows the Law of Conservation of Mass?
Remove 2 hydrogen atoms (reactant) and 1 oxygen atom (product).
This equation already follows the Law of Conservation of Mass.
Add 2 hydrogen atoms (product) and 1 oxygen atom (reactant).
Add coefficients to some of the compounds to balance the number of atoms.
Answer:
Add coefficients to some of the compounds to balance the number of atoms.
Explanation:
The balanced equation should be CH4 + 2 O2 = CO2 + 2 H2O
So you see we had to use coefficients in front of some of the compounds to balance number of atoms.
What actions do you take immediately after a burn occurs?
Cool in cold or lukewarm water for 20 minutes.
This should be done as soon as possible after an injury. Never use ice, ice water, cream, or greasy substances like butter on the burn. Be careful to keep the airways open when treating burn victims. Associated smoke inhalation injuries are very common, especially when the patient is burned in an enclosed space such as a room or building. Even people who have been burned outdoors can inhale smoke. Stop the burning process as soon as possible. Remove all clothing and jewelry near the burned area.
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Why does fluorine react with xenon but iodine does not?
Fluorine reacts with xenon but iodine doesn't because fluorine is highly electronegative, it can pull electrons from xenon which is a noble gas and rarely reactive. On the other hand, iodine has low electronegativity and is least reactivity, so doesn't react with xenon.
Fluorine and iodine belongs to the family of halogens with the general electronic configuration ns²np⁵ . So, they have the tendency to attract electrons in their valence shell. Xenon, on the other hand is a noble gas with a stable electronic configuration ns²np⁶.
In family of halogens, Fluorine has the highest electronegativity and iodine has the least due to increase in its size. So, more electronegative fluorine has the tendency to form compounds with xenon whereas both iodine and xenon being less reactive cannot form a bond together.
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What physical property is characteristic of all of the elements in the group 18 of the periodic table?
The quantity of electrons inside the valence (outermost) shells as well as the electron configurations among elements belonging to the identical group are identical. They display comparable chemical characteristics.
Noble gases were low chemically reactive, odourless, colourless, nonflammable, as well as monotonic gases. Noble gases are exceedingly stable as well as uncommon to form chemical connections since they have minimal inclination to receive or lose electrons, thanks to the complete valence electron shells of such atoms.
These gases don't receive, lose, or share electrons, making them inert as well as unreactive. They are often referred to as noble gases due to their rarity inside the atmosphere of the earth.
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which type of radioactive decay has the net effect of changing a neutron into a proton?
Answer: Beta Decay is the kind of radioactive decay that has the net effect of changing a neutron into a proton.
Explanation:
The opposite path, in which a neutron becomes a proton, is also possible. Exactly what happens is that a weak force changes the flavor of the card from top to bottom and vice versa. When this happens, the quark emits a W boson, which quickly decays into either an electron/antineutrino pair or a positron/neutrino pair, depending on the direction of change (neutron decays to protons, electron/antineutrino pairs are created).
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Explain how electron micrographs such as this helped falsify the Davson-Danielli model of membrane structure
Electron micrographs aided Davson-Danielli in determining the membrane structure since they assumed the phospholipids were in between the proteins, resulting in the sandwich model.
What is electron micrographs?An picture acquired by hitting the object with a tightly focused (10 nm diameter) electron beam and measuring the transmitted, secondary, backscattered, and diffracted electrons, as well as the distinctive X-rays released. The method of electron microscopy (EM) is used to acquire high-resolution pictures of biological and non-biological material. In biomedical research, it is utilized to explore the precise structure of tissues, cells, organelles, and macromolecular complexes. Modern electron microscopes generate electron micrographs by capturing pictures with sophisticated digital cameras and frame grabbers.
Here,
Davson-Danielli was assisted in establishing the membrane structure by electron micrographs since they thought the phospholipids were in between the proteins, resulting in the sandwich model.
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Plzzzzzzzzz help whole slide
Answer: in order, cellular respiration, carbon dioxide, agricultural, methane, digestion, volcanic activity, eruption
Explanation:
its hard to explain why these things are thing you will have to memorize at first and then as you get later into science, you will learn about chlorophyll and mitochondria, and all sorts of fun things!