Answer:
False
Explanation:
The increase in the temperature of a liquid also increases the rate of evaporation, as the same for the other way around. As intermolecular force increase rate of evaporation decreases. This happens because intermolecular force make it less likely for the molecules on the surface to escape from liquid and become vapour gas. As temperature increases rate of evaporation increases.
Which 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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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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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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the formula for the selenate ion is seo42−. predict the formula for selenic acid.
Answer:
The formula for selenic acid is H2SeO4.
Explanation:
Selenic acid is an oxoacid of selenium, which means that it contains selenium and oxygen atoms bonded together in a compound that also contains hydrogen atoms. The selenate ion, which has the formula SeO42-, is an ion that contains selenium and oxygen atoms bonded together. Based on these facts, we can predict that the formula for selenic acid will contain selenium, oxygen, and hydrogen atoms.
To determine the specific ratio of atoms in the formula for selenic acid, we can look at the valences of the elements involved. The valence of an element is the number of bonds it can form with other atoms. Selenium has a valence of 6, oxygen has a valence of 2, and hydrogen has a valence of 1.
Since selenium has a valence of 6, it can bond with 6 oxygen atoms. This means that selenic acid will contain at least one selenium atom bonded to 6 oxygen atoms. In addition, selenic acid will contain hydrogen atoms, which can bond with oxygen atoms. Based on these considerations, we can predict that the formula for selenic acid will be H2SeO4, which contains one selenium atom bonded to 6 oxygen atoms and 2 hydrogen atoms.
-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
pcccpppppcA 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.
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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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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If the actual yielsd of a reaction is 50 g and the theoretical yield is 60 g. What is the percent yield.
If the actual yield and percent yield are 51.4g and 77.0%, respectively, calculate the theoretical yield. We predicted a theoretical yield of 13 grams for the reaction of Na with Cl2.
Yield is determined by dividing the principal amount by the net realized return. Gains and returns on stock investments, for instance, can take one of two kinds. On the basis of the chemical equation's stoichiometry, theoretical yield is computed. Experimental data are used to determine the real yield. Calculating the ratio of actual yield to theoretical yield yields the percent yield. The % ratio of the theoretical yield to the actual yield is known as the percent yield. It is calculated as the theoretical yield multiplied by 100% divided by the experimental yield.
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What other factors of weather and climate are affected by elevation?
Answer:
Wind, Rain and Snow
Consequently, winds are stronger at higher elevations. Colder temperatures at higher elevations also create precipitation, because cold air can't hold as much moisture as warm air. Moisture condenses out of the air as snow and ice, and it falls back to the ground.
The factors that affect the weather and climate are latitude, altitude, wind, and distance from the sea.
What is climate?Climate can be described as the long-term weather pattern in an area, averaged over 30 years. Climate is the mean as well as the variability of meteorological variables over months to millions of years.
Some of the meteorological variables that are used to measure are temperature, atmospheric pressure, humidity, wind, and precipitation. The climate can be defined as the state of the components of the climate system, including the atmosphere, cryosphere, lithosphere, and biosphere, and the interactions between them.
The climate is affected by its latitude, terrain, altitude, land use, and water bodies and their currents. Climates can be classified based on the average and typical variables, most temperature, and precipitation. It is used in studying of the biological diversity and how climate change affects it.
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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 element does not form a stable ion with the same electronic configuration as neon?
A Magnesium B Fluorine C Sodium D Chlorine
Answer:
Explanation:
chlorine
Chlorine must lose 7 electrons to attain the electronic configuration of Neon and this state is precarious in the case of chlorine which is an electronegative element
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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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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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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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
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
The transfer of energy from one region of the atmosphere to another is of great importance in meteorology for it affects the weather. Calculate the heat needed to be supplied to a parcel of air containing 1. 00 mol air molecules to maintain its temperature at 300 K when it expands reversibly and isothermally from 22 dm3 to 30. 0 dm3 as it ascends
Energy transfer from one region of the atmosphere to another is critical in meteorology because it affects the weather.
What is Meteorology?
Meteorology is the science of studying the atmosphere and its phenomena such as weather, climate, and air pollution. It is a branch of the atmospheric sciences and studies the physical processes that make up the atmosphere and how the atmosphere affects the Earth and its inhabitants.
The amount of heat needed to be supplied to the parcel is given by the equation:
Q = nRT∆V
Where n is the number of moles of air, R is the ideal gas constant, T is the temperature in Kelvin and ∆V is the change in volume.
Therefore, the amount of heat needed to be supplied to the parcel is given by:
Q = (1.00 mol)(8.314 J/molK)(300 K)(30.0 dm3 - 22.0 dm3)
Q = 4, 573.2 J.
This is important because it demonstrates the amount of energy that must be supplied in order to keep the parcel of air at a constant temperature as it expands. Without this energy, the temperature of the parcel would decrease as it expands, resulting in a change in its weather patterns.
Hence, the amount of heat needed is: Q = 4, 573.2 J.
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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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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
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.
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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Convert 5,500 mg to kg. Show your work to receive full credit.
Classify: Drag out different combinations of molecules in the Gizmo and categorize them. Give at least three examples of molecule combinations for each intermolecular force.
Dipole-dipole forces
Dipole-induced dipole forces
London dispersion forces
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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:
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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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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At 298 K and 1 atm, bromine is a liquid with a high vapor pressure, whereas chlorine is a gas. This provides evidence that, under these conditions, the
At 298 K and 1 atm, bromine is a liquid with high vapor pressure, while chlorine is a gas. This proves that the intermolecular forces of bromine are greater than those of chlorine under these conditions.
At a temperature of 298 K and a pressure of 1 atm, bromine is in a liquid state due to the strong attraction between Br-Br molecules.
At the same temperature and pressure, chlorine exists in the gaseous state due to covalent bonds, while bromine has non-polar covalent bonds.
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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!
The density of ________ is 0.900 g/L at STP? a) CO
b)CH4
c) NO
d) Ne
e) N2
Answer:ne
Explanation: