Answer:
The molarity of 2.0 liters of an aqueous solution that contains 0.50 mol of potassium iodide is 0.25M.HOW TO CALCULATE MOLARITY:The molarity of a solution can be calculated by dividing the number of moles by its volume. That is;Molarity = no. of moles ÷ volumeAccording to this question, 2.0 liters of an aqueous solution that contains 0.50 mol of potassium iodide. The molarity is calculated as follows:Molarity = 0.50mol ÷ 2LMolarity = 0.25MTherefore, the molarity of 2.0 liters of an aqueous solution that contains 0.50 mol of potassium iodide is 0.25M.Learn more about molarity at: brainly.com/question/2817451
Explanation:
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this fossil is evidence that insects lived on earth long ago
which of these modern insects is most likely to be the closest relative of the insect in the fossil ?
Answer:
c.
Explanation:
The oldest insect fossil has been proposed to be Rhyniognatha hirsti, estimated to be 400 million years old, but the insect identity of the fossil has been contested. Global climate conditions changed several times during the history of Earth, and along with it the diversity of insects.
Answer:C
Explantion:This is The oldest insect fossil has been proposed to be Rhyniognatha hirsti, estimated to be 400 million years old
When trees are cut down in a forest it increases the amount of runoff going into nearby streams and rivers true or false
Isopropanol burns in oxygen to yield carbon dioxide, water, and heat. which word equation best represents this chemical reaction? isopropanol right arrow. carbon dioxide water heat isopropanol right arrow. carbon dioxide water oxygen isopropanol oxygen right arrow. carbon dioxide water heat isopropanol oxygen heat right arrow. carbon dioxide water
Isopropanol burns in oxygen to yield carbon dioxide, water, and heat. the word equation that best represents this chemical reaction is isopropanol oxygen ---> carbon dioxide + water + heat. Option C. This is further explained below.
What are chemical reactions?Generally, A chemical reaction is simply defined as a process that converts compounds known as reactants into distinct substances, known as products.
In conclusion, In the presence of oxygen, isopropanol burns to produce carbon dioxide, water, and heat. This chemical reaction is best represented by the word equation isopropanol oxygen= Carbon dioxide + water + heat
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Answer:
C: isopropanol + oxygen -> carbon dioxide + water + heat
A 500-gram C6H12O6 solution has a concentration of 300 ppm. How many grams of C6H12O6(s) are in this solution?
Considering the definition of ppm, there are 0.15 grams of C₆H₁₂O₆ in the solution.
What is ppmParts per million (ppm) is a unit of measurement for concentration that refers to the number of units of the substance in each million units of the whole.
In other words, ppm indicates the ratio of the concentration of one substance to the concentration of another, as one unit of solute dissolved in one million units of solvent.
ppm of solid and liquid elements is calculated by weight:
[tex]ppm=\frac{weight of the substance analyzed}{ overall weight} x10^{6}[/tex]
Mass of C₆H₁₂O₆In this case, you know:
ppm= 300weight of the substance analyzed= ?overall weight= 500 gramsReplacing in the definition of ppm:
[tex]300ppm=\frac{weight of the substance analyzed}{500 grams} x10^{6}[/tex]
Solving:
[tex]weight of the substance analyzed=\frac{300 x 500 grams}{10^{6}}[/tex]
weight of the substance analyzed= 0.15 grams
Finally, there are 0.15 grams of C₆H₁₂O₆ in the solution.
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What are some applications of fission reactions? as a zero-waste energy source for generating large amounts of heat for creating stable elements from unstable ones for creating new, heavier elements as the energy source in nuclear weapons
Some applications of fission reactions are as a zero-waste energy source for generating large amounts of heat and as the energy source in nuclear weapons.
What are nuclear fission reactions?Nuclear fission reactions are reactions in which the nucleus of heavier atoms are split into two or more atoms of smaller nucleus with the release of energy and radiation.
Some of the applications of fission reactions are as a zero-waste energy source for generating large amounts of heat and as the energy source in nuclear weapons.
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A student dissolves powdered tea in water. How can the student separate the parts of the mixture?
Answer:
The student can evaporate the liquid water.
Explanation:
The student only mixed water with the powdered tea. Therefore, if the water is evaporated from the mixture, the student will be left with the tea mixture only.
What is one element that is found in the human body, air, or the universe ?
Answer:
Hydrogen
Explanation:
It is pretty much present everywhere :)
Describe in your own words, why a balloon, after it has been rubbed on a sweater, floats back towards the sweater when released.
Your answer must contain electric force, attract, electrons, and protons.
Explanation:
By rubbing the balloon on a sweater, you can transfer negative charges onto the surface of the balloon
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Which statement describes how heat is transferred by convection?
Question 4 options:
Air molecules touch the warm ground, heating them up
Warm air rises and cool air sinks
Sunlight travels through space
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Convection is a method of heat transfer that causes heat to be transferred from one object to another object with being in actual contact but I same atmosphere.
So, the correct phenomenon that describes how heat is transferred by Convection is :
Statement 2. Warmer air rises and copl air sinks.
based on location on the periodic table, which metal is likely to be less reactive than both strontium and sodium?
Answer:
Magnesium is likely to be less reactive than both strontium and sodium
Answer:
The answer is Magnesium (Mg)
Which option is a nonrenewable resource?
O at least some types of lumber
O solar energy
O oil
O wind
Which hydrocarbon will undergo a substitution reaction with chlorine.
The hydrocarbons that will undergo substitution reactions with chlorine would be those that are saturated.
What are saturated hydrocarbons?They are hydrocarbons that contain no double or triple carbon to carbon bonds.
Such hydrocarbons cannot undergo addition reactions unlike those that contain double or triple bonds.
Alternatively, saturated hydrocarbons are able to undergo substitution reactions with chlorine in the presence of light, with hydrogen being displaced in the process.
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The type of surface that warms up the slowest is .
Answer:
Answer might be Water...
A surface with a high reflectivity or low heat conductivity typically warms up at the slowest rate. Ice, snow, and some metals, like aluminium, are examples.
A smooth surface is one that doesn't have any ridges or other surface imperfections. It is smooth and devoid of any roughness, dents, or lumps. This kind of surface, which is highly reflective, is frequently seen in materials like glass, polished metal, or plastic. Rough texture: An uneven or irregular texture is indicative of a rough surface. It has lumps, ridges, or other abnormalities that microscopically obstruct the smoothness. Rough surfaces reduce the reflecting qualities of light by scattering it in many directions. Wood, concrete, or coarse fabrics are a few examples of rough surfaces.
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The specific heat capacity of water is 4.184 J/gC. The specific heat capacity for ethanol is 2.46 J/gC. If both liquids start at the same temperature and exactly 30J of heat are added to each, which liquid's temperature will increase more
Answer:
ethanol
Explanation:
it is a thermometric liquid
Name these compounds according to IUPAC. (ASAPP)
The chemical's IUPAC names of the given compound are propanal and acetone.
What is IUPAC naming?IUPAC is the international union of practical and applied chemistry. It set rules for standard naming of the compound.
Propanal, or propanaldehyde, is an aldehyde that has one double bond and one oxygen atom.
Acetone is a kind of ketone. Ketones have the functional group R2CO.
Thus, chemical's IUPAC names of the given compound are propanal and acetone.
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in a given homologous series of hydrocarbons, the boiling point generally increases as the size of the molecules increases. the best explanation for this statement is that in larger organic molecules
The boiling point of hydrocarbons generally increases as the size of the molecules increases because more bonds are needs to be broken in larger organic molecules.
What are hydrocarbons?Hydrocarbons are organic compounds which here composed of hydrogen and carbon alone.
Hydrocarbons are grouped into families or homologous series based on a reactive group known as the gincyiial group
The homologous series include
alkanesalkenes alkynesThe boiling point generally increases as the size of the molecules increases because more bonds are needs to be broken in larger organic molecules.
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What happens to water when it is heated from 0 °C to 4 °C? (5 points)
It freezes.
It expands.
Its density increases.
Its composition changes.
Answer: The volume decreases
Explanation:
Because 4C is a cold temperature and atoms inside the water start to move slowly and begins to cange into a solid formation.
The density of the water increases and it is maximum at 4 degrees Celsius.
What is Freezing Point ?The temperature at which the liquid and solid states of the substance are in equilibrium at atmospheric pressure .
freezing point of water is 0° Celsius or 32° Fahrenheit.
Though liquids expand on heating water does not expand between 0°C to 4°C instead it contracts as water has maximum density at 4°C.
Thus the option C is the right answer , The density of the water increases as water is heated from 0 degree Celsius to 4 degree Celsius
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you don’t have to do all of the questions, but it would really be appreciated
Answer:
good
Explanation:
excellent news and great job on the purpose and basic activities of the business
Why does the hemisphere that is titled away from the sun experience winter?
(science)
why is it necessary to use clean sponge and cleaning rags in dishwashing?
Answer:
cloths/sponges can harbor harmful pathogens and spread germs if not cleaned frequently. A damp, smelly dish cloth/sponge is telling you germs are multiplying!
Explanation:
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What is/are defined in elements of the same group?
A. Atomic stability
B. Electron configuration
C. Chemical/physical properties
D. Exponentially increasing atomic weight
Answer:
C
Explanation:
Elements in the same groups have similar chemical/physical properties. The reason the answer isn't electron configuration is that if this was the case, there would be no reason for transition metals to exist as they can have a varying amount of electrons in their outer shell.
For example, all alkali metals (Group 1) turn into positive ions when reacting and Halogens (Group 7) all turn into negative ions after reacting.
illustrate an oxygen atomic drawing
A gas occupies a volume of 131.0-mL at 165.2-kPa. What volume will the gas occupy at 170.8-kPa if the temperature remains the same?
The relationship between the pressure and the volume of the gas at a constant temperature is given by Boyle's law. The volume, of the gas at 170.8 kPa is 126.70 mL.
What is Boyle's law?Boyle's law states the inverse relationship between the pressure and the volume of the gas. The formula for the law can be given by:
[tex]\rm P_{1}V_{1} = P_{2}V_{2}[/tex]
Given,
Initial pressure = 165.2 kPa
Initial volume = 131.0 mL
Final pressure = 170.8 kPa
The final volume is calculated as:
165.2 * 131.0 = 170.8 * V
V = 126.70 mL
Therefore, the final volume of the gas is 126.70 mL.
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What is a constant in an investigation?
Answer: Heyaa! ~
A constant in an investigation is a quantity
that does not change...
something that is not variable. In statistics, and survey research in particular, responses are typically described as random variables.Hopefully this helps you! ^^
What is a physical change?
Answer:
A physical change is when something changes on the inside, but it does not change what it is made of.
Others would be the formation of precipitate, the release of energy, or change in odor.
The option that would lead to the formation of precipitation, release of energy or change in color is : Chemical change
Characteristics of Chemical changeChemical changes leads to the formation of precipitate in the form of bubbles, release of energy or change in color for example :
Rusting of Iron : As Iron rusts the color of the Iron will changeBoiling of liquid : As water or any other form of liquid boils the precipitate forms in the form of bubbles and energy in the form of heat is given offHence we can conclude that The option that would lead to the formation of precipitation, release of energy or change in color is : Chemical change
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When cooking in a convection oven, for best results you place your food in the center of the oven. This is because convection is energy transfer
A. by currents of moving liquid or gas
B. from a reaction system to its surroundings
C. by direct matter contact
D. by electromagnetic waves
This is because convection is energy transfer by currents of moving liquid or gas.
What is heat transfer by convection?
Heat transfer by convection is the transfer of heat from one place to another due to the movement of fluid.
When cooking in a convection oven, for best results you place your food in the center of the oven, this is because convection is energy transfer by currents of moving liquid or gas.
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This is because convection is a type of energy transfer by currents of moving liquid or gas (Option A).
What is convection?Convection is a physical natural phenomenon associated with energy transfer through a fluid.
In convection, a suitable fluid that produces what transfer can be for example air and/or water.
In conclusion, this is because convection is energy transfer by currents of moving liquid or gas (Option A).
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If a gas is compressed from 4L to 1L, and the temperatures remained constant, what happens to the pressure?
According to Gay lussac's law
[tex]\\ \rm\Rrightarrow P\propto T[/tex]
Pressure is directly proportional to temperatureTemperature is constant so no use of thisBut according to Boyles law
[tex]\\ \rm\Rrightarrow P\propto \dfrac{1}{V}[/tex]
If volume is decreased by 4 times then pressure is increased by 4times
The reactions listed below are either chemical reactions or nuclear reactions. which are nuclear reactions? check all that apply. upper h superscript plus, plus upper o upper h superscript minus right arrow upper h subscript 2 upper o. superscript 185 subscript 79 upper a u right arrow superscript 181 subscript 77 upper r d plus superscript 4 subscript 2 upper h e. 4 upper f e plus 3 upper o subscript 2 right arrow 2 upper f e subscript 2 upper o subscript 3. superscript 210 subscript 84 upper p o right arrow superscript 206 subscript 82 upper p b plus superscript 4 subscript 2 upper h e.
The equations that are nuclear reactions are as follows:
superscript 185 subscript 79 upper Au right arrow superscript 181 subscript 77superscript 210 subscript 84 upper Po right arrow superscript 206 subscript 82 upper Pb plus superscript 4 subscript 2 upper He.What is nuclear reaction?A nuclear reaction is a reaction that involves the fission of an atomic nucleus, or the fusion of one or more atomic nuclei and/or subatomic particles in which the number of protons and/or neutrons in a nucleus changes.
The products of a nuclear reaction may contain a different element or a different isotope of the same element.
Therefore, the equations that are nuclear reactions are as follows:
superscript 185 subscript 79 upper Au right arrow superscript 181 subscript 77superscript 210 subscript 84 upper Po right arrow superscript 206 subscript 82 upper Pb plus superscript 4 subscript 2 upper He.Learn more about nuclear reaction at: https://brainly.com/question/19752321
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Answer:
b. Reaction B involves a greater change and a change in element identity.
Explanation:
i got it wrong
Convert these pressures:
820 mm Hg =____ atm
206 kPa =
atm
0.6 atm =
kPa
1520 mm Hg = __ kPa
850 kPa =
mm Hg