The pOH of the substance is known to be given by the hydroxide ions. A substance has a pOH of 5.9. The [OH-] of the substance is 7.23.
What is pOH?By estimating the concentration of OH ions in a solution, pOH can be used to gauge both acidic or alkaline a solution is. The OH ion concentration's negative logarithm is known as pOH.
pOH = -[tex]\rm -Log_{10}[OH]^{-}[/tex]
In this problem,[tex]\rm -Log_{10}[OH]^{-}[/tex]
pOH = ] = [tex]\rm -Log_{10}[OH]^{-}[/tex]
- log₁₀[5.9] = 7.23
A substance has a pOH of 5.9. The [OH-] of the substance is 7.23 .
Once you get the value of pOH we will get the value of pH.
pOH = 14 - pH
pH = 14 - 3 = 11
An acid that is weak is [tex]\rm H_{2} S[/tex]. As a result, has a pH of 3.92.
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Claire made the diagram above to show how the puddle she saw on the way to school disappeared
by the end of the day. She wanted to show her idea that heat from the sun caused the water to
evaporate into the air. However, Claire's diagram is incomplete.
Think about what's missing. What would you add to the diagram to better show Claire's idea?
Another arrow showing the heat coming from the sun will compete the diagram.
What is missing?We know that evaporation occurs when the molecules that are at the surface of the liquid receive sufficient energy to escape from the attractive forces of the other molecules in the liquid.
We can see from the diagram that the molecules of water are moving upwards. The question now is, why are the molecules evaporating? The molecules of water are evaporating because of the heat from the sun thus another arrow showing the heat coming from the sun will compete the diagram.
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1. True or False. The sound of a cat purring is caused by vibrations. O True O False
Answer:
True.
Explanation: " Most now say that purring begins in the brain. A rhythmic, repetitive neural oscillator sends messages to the laryngeal muscles, causing them to twitch at the rate of 25 to 150 vibrations per second (Hz). "
stellar equilibrium is a balance between what two things
Answer:
Outward pressure and inward gravity
Explanation:
HELP PLEASE!!
Choose something living to observe, either outdoors or indoors. If you’re observing your puppy playing in your backyard, you must not only record the puppy’s actions, but the time of day, the weather, the sounds around you, who else is there, etc. All of these things are important, and should anything surprising happen, it becomes very helpful to have all the information.
For example, if you don’t record that a thunderstorm is approaching, and you just say “the puppy suddenly stopped chasing the stick and hid under a bush,” you are not recording all of the information. So use all your senses and record carefully and thoroughly. Be sure to be objective. Instead of saying “my puppy kept jumping up happily,” you should say “my puppy jumped 15 cm off the ground 6 times, wagging his tail.” That way the reader decides if he is happy or not! A record of at least 25 observations should be made.
The above observation is made as follows:
There is a bird circling right above where we sit. It appears to be a hawk. It has circled round our location five time each time being at least 25 meters above the ground. It is to be noted that the weather as at this time is sunny. and it is about noon. After the fifth time, it swoops down at a terrific speed of about 80 miles per hour. Then it snatches a lizard off the ground and flies off to a tree which is about 50 yards from where we are. As it flies off, the sounds of the wings beating against the air can be heard faintly.
What is observation?Observation is the active gathering of information from primary sources. In living things, observation uses the senses. In science, observation can also involve capturing and recording data using scientific instruments.
Why is observation relevant in Science?Science relies heavily on observation. Scientists gather and record data through observation, which allows them to develop and test hypotheses and ideas.
Scientists observe in a variety of ways, using their own senses as well as instruments like microscopes, scanners, and transmitters to enhance their vision or hearing.
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If you found the mass of the Styrofoam packing peanuts and bricks and divided their mass by their
volumes, which of these would you find to have a higher density?
By dividing the found mass by volume, the density of the object will be obtained. The density of Styrofoam packing peanuts and bricks are almost similar.
Mass of a substance is the quantity of matter present in the substance. The unit of mass is kg.
A substance's volume is how much room it occupies. The unit of volume is [tex]m^3[/tex].
Density of a substance is the mass of the substance present in the given volume.
Density = Mass / Volume
The unit of density is [tex]kg/m^3[/tex].
Objects made from the same substance have the same density.
The density of Styrofoam packing peanuts is 2.3-2.4 pounds per cubic foot and Styrofoam bricks is 2-3 pounds per cubic foot and hence are similar with a slight difference.
Therefore, the density of Styrofoam packing peanuts and bricks is almost same.
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What is reduced in the reaction below?
2H₂ + O2 → 2H₂O
O A. H₂
OB. H₂0
O C. 0₂
OD. Reduction does not occur.
Answer:
C. O2Explanation:
explaination is in attachment.
What is capillary action? Describe how capillary action shown by water is useful for plants and animals on Earth.
Answer:
Capillary action :-the movement of liquid along a surface of a solid caused by the attraction of molecules of the liquid to the molecules of the solid
Capillaries/xylem:- narrow pipes take the water drops up through the roots of the tree
Transpiration pull :-helps to get water to the top of the tree
Alison mixes baking soda and vinegar in a clear glass container. She places a blue balloon over the mouth of the container. Which condition tells Alison that a chemical change is taking place?
The balloon fills and expands.
The mixture is cloudy in appearance.
The balloon gets lighter blue as it expands.
The container holds a mixture of a solid and liquid.
Answer:
The balloon fills and expands.
Explanation:
The balloon expands because of the carbon dioxide being made by the mixture. That's the chemical reaction.
What is the landform in the image?
Image of a large area of flat or gently rolling land with low relief
Dune
Hill
Lake
Plain
Answer: Plain
Explanation: A plain is a large area of flat or gently rolling land.
I just took the test got it right your Answer is (PLAIN)
20 POINTS
A diatomic molecule shares a single pair of electrons. What type of bond is present in the molecule?
A single covalent bond because each atom requires one more electron to complete its octet.
A single covalent bond because each atom requires two more electrons to complete its octet.
A double covalent bond because each atom requires four more electrons to complete its octet.
A double covalent bond because each atom requires two more electrons to complete its octet.
What is formed is a single covalent bond because each atom requires one more electron to complete its octet.
What is the type of bond?Let us recall that a bond is formed between two atoms when we have to atoms bonded together, the atoms are connected by means of a chemical bond. There are different kinds of bonds that are used to connect atoms together such as;
Ionic bondsCovalent bondsMetallic bonds and Dative bondsWhen we talk about a diatomic molecule, we are talking about a molecule that is composed of two atoms that are exactly the same. This implies that the electronegativities of the atoms must be the same and the bond that is formed would be a nonpolar covalent bond. There are so many of such kinds of molecule that we have in chemistry such as the oxygen molecule, the hydrogen molecule, the fluorine molecule and so on.
Thus, given that diatomic molecule shares a single pair of electrons, we can say that this is a single covalent bond because each atom requires one more electron to complete its octet.
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please help with question
give the answer in correct scientific notation with the correct number of significant figures
the density of water is close to 1.00g/ml. If an object is more dense than water, would you expect the slope of the resulting line plot of mass and volume data to be greater than of water, less than of water or the same?
The slope of the line plot of mass and volume of the object will be greater than of water.
What is the density of a substance?The density of a substance is the ratio of the mass of the the substance and its volume.
Density = mass/volumeDensity measures the compactness or the amount of space present in a given substance of known mass and volume. The higher the density of a substance the more compact the substance is.
The density of water is close to 1.00g/ml.
The slope of a line plot of mass and volume will give the density of the substance.
The slope of a line plot of mass and volume of volume of water will give a value close to one.
A substance which is denser than water will have a density greater than 1 g/mL
Therefore, the slope of the resulting line plot of mass and volume of the object will be greater than of water.
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How you come up with the molecular formula for benzocaine from it's skeletal formula?
The benzocaine molecule has 23 atoms in all (s). There are two oxygen atoms, nine carbon atoms, one nitrogen atom, and eleven hydrogen atoms (s). Therefore, the chemical formula for benzocaine is:
C9H11NO2
Unlike the empirical formula, which gives the numerical proportions of atoms of each type, the molecular formula, as shown above, indicates the numbers of each type of atom in a molecule without providing structural information.
Stoichiometry, or the computation of the relative quantities of reactants and products in chemical processes, is based on the chemical formula above. The quantity of each element specified in the chemical formula must remain constant according to the law of conservation of mass.
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Nitrates are pollutants. They are harmful when they enter the water supply. Humans are the source of most nitrate pollution Nitrates come from overuse of fertilizer, large-scale animal farms, and septic tanks. The table shows the amount of nitrates the Colorado River over time. Time Period Nitrates Entering Water (lbs) 100,000 150,000 250,000 500,000 800,000 1,200,000 1,400,000 1976-1980 1981 - 1985 1986-1990 1991 - 1995 1996-2000 2001-2005 2006-2010 Which conclusion is best supported by the information in the table?
A. Scientists need to measure the effect of pollution instead of the amount of pollution.
B. Problems associated with an increase in nitrates will continue to get worse over time.
C. Scientists need to reject the data because it only measures one kind of water pollution.
D. The population in the area must have grown exponentially to explain the increase in nitrates.
Help Me Please
Scientists need to measure the effect of pollution instead of the amount of pollution.
What are nitrate pollutants?Ingesting large amounts of nitrate, a frequent groundwater contaminant, can have detrimental effects on one's health. Nitrate has no flavor, no aroma, and no color. Nitrate that occurs in nature at low concentrations can be normal, but excessive amounts can contaminate groundwater.
Effect of nitrate on human life :Stomach acid cannot degrade nitrates on its own. Instead, your gut biome may convert nitrate into nitrite, which may result in health issues like a higher risk of cancer. An inorganic, water-soluble chemical is nitrate.
A growing body of research suggests possible links between nitrate/nitrite exposure and other health issues like elevated heart rate, motion sickness, headaches, and cramps in the abdomen.
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PLEASE HELP ME I AM STRUGGLING SO BADLY ACELLUS
What is the energy of an orange lamp with a frequency of 5.10 x 10^14 Hz
? X 10^? <----- ANSWER LIKE THAN PLEASE
I just need the coefficient
Answer:
5.88235.10-7
Explanation:
Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. The the energy of orange lamp with a frequency of 5.10 x 10¹⁴ Hz is 3.40×10⁻¹⁹J.
What is electromagnetic wave?
Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave, light wave.
There is a relation between energy of wave. frequency of wave, and wavelength of wave
Mathematically,
E=hv
where,
E = energy of electromagnetic wave
h is planks constant having value 6.67×10⁻³⁴js
v is the frequency of electromagnetic wave =5.10 x 10^14 Hz
Substituting the given values
E= 6.67×10⁻³⁴js×5.10 x 10^14 Hz
E= 3.40×10⁻¹⁹J
Therefore, the energy of orange lamp with a frequency of 5.10 x 10¹⁴ Hz is 3.40×10⁻¹⁹J.
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7. A bottle found on a shelf contains either ethanol (density 0.789g/mL) or antifreeze (ethylene
glycol density 1.11g/mL). All you have available to measure volume is a measuring cup showing
ounces. You perform the following experiment in the pictures in Fig 7. Given that 1mL= 0.0338 fl
oz. Calculate the density of the substance and identify what it is. Must show your work/setup for credit
The substance is ethylene glycol.
What is density?The term density is the ratio of mass to volume. We have two substances here which are ethanol and ethylene glycol. We have the mass of the solution as shown in the image in question 7 in the attachment to the question.
Mass of the solution = 381 - 250 = 131 g
Volume of the solution = 4 fl oz
1mL= 0.0338 fl
x = 4 fl oz
x =4 fl oz* 1mL/0.0338 fl oz
x = 118.34 mL
Density = mass/volume = 131 g/118.34 mL = 1.11 g/mL
The substance is ethylene glycol.
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ASHTON WANTS TO FIND THE VOLUME OF A BLOCK OF WOOD
Explanation:
need help in a question u stuck in??
Determine the volume of liquid in the graduated cylinder and report it to the correct number of significant figures.
depends on the graduated cylinder's size and the volume between marks. Generally speaking, you can interpolate (guess) to increase the precision a little beyond the volume markers, but whether it will give you an extra sig fig varies.
For instance, a 10-mL graduated cylinder contains markings every 0.1 mL. Your reading will have two sig figs if you simply use the reading as the nearest marking: 4.5 mL, 9.7 mL, etc. However, you can become a little bit more accurate by interpolating. How close is the liquid level to the halfway point between the markings? exact center? So, instead of 4.5 mL, it is 4.55 mL. Approximately halfway? How much? 4.53 or 4.54.
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The molar mass of water (H₂O) is 18.02 g/mol. Yun has 0.025 mol of H₂O for a laboratory experiment.
How many grams of water does she have?
The amount of water Yun has for experiment is 0.45 gram.
One mole of any substance is equal to the Avogadro number. we can obtain number of moles of any element If it's given mass and molar mass are known.number of moles = given mass / molar massThe proportionality factor that connects the quantity of substance in a sample to the number of constituent particles in that sample is called the Avogadro constant. ( 6.023 × 10²³)Given,
molar mass of water (H₂O) is 18.02 g/mol.
Yun has 0.025 mol of H₂O
we have to find out amount of water she has for her experiment
number of moles of water = given mass of water / molar mass of water
mass of water = number of moles of water × molar mass of water
= 0.025 × 18.02
= 0.45 gram
Therefore, Yun has 0.45 gram of water for experiment.
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- What mass of NaoH required to make 500 ml of 3M solution?
Answer:
The molar mass of NaOH is given to be 39.99 g/mol. Therefore, we need 59.985 grams of NaOH.
Explanation:
Polly wants to learn if males or females have a more negative attitude towards rodents. She gives each of her classmates the following confidential questionnaire:
Gender:
Please rate how strongly you agree with the following statements according to this scale:
1. strongly disagree
2. disagree
3. neither agree nor disagree
4. agree
5. strongly agree
Rodents are cute
Rodents are scary
Rodents are gross
Rodents are nice
Which data table should Polly use to tabulate and organize the data from the completed questionnaires?
Answer:
x
Explanation:
The qualitative data required can only be obtained from table X.
What is a questionnaire?A questionnaire is a document that could be used to obtain the views of other people regarding a matter. The questionnaire serves the purpose of helping us to gather qualitative data.
In this case, the qualitative data that Prolly wants to gather is to find out if males or females have a more negative attitude towards rodents. She has ensured that this is a confidential questionnaire.
Looking at the four tables as we can see them from the image that is attached to the question, the qualitative data required can only be obtained from table X.
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Question 12 (Essay Worth 7 points) (01.01 HC) Describe the role of consumers in a food web. Are consumers heterotrophs? Justify your answer. please help it's due today
Consumers are organisms which depend on the producers or autotrophs for their food and nutrition.
Consumers are also known as heterotrophs, and they feed on the producers (autotrophs or self-feeders or plants) and herbivores (animals that eat plants) for food and energy. They don't produce their own food.
There are four types of consumers:
1) Primary – Herbivores are known as primary consumers and their source of food is plants or the first trophic level of the food chain. Example, Rabbits, Butterflies, Zooplanktons, etc.
2) Secondary – these consumers eat both plants and herbivores and are therefore also known as omnivores. Example, Ants, Crabs, Rats, Humans, etc.
3) Tertiary – these consumers eat primary and secondary consumers. Thus, they can be omnivores as well as carnivores. Example, Hawks, Snakes, Lions, etc.
4) Quaternary – these consumers prey on the tertiary consumers. Example, Polar bear, Alligator, etc.
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How are deltas and rivers similar?
Both are composed of ice.
Both feed into other bodies of water.
Both have high elevations.
Both travel in a north-south direction.
A river delta is a land form shaped like a triangle, created by deposition of sediment that is carried by a river and enters slower-moving or stagnant water. This occurs where a river enters an ocean, sea, estuary, lake, reservoir, or (more rarely) another river that cannot carry away the supplied sediment.
With this information you can infer that it is B, Both feed into other bodies of water.
using Venn diagram, describe the characteristics of elements and compounds
we can understand similarities and differences of elements and compounds through Venn diagram.
COMPOUND
Compounds contain elements in predetermined ratios.Each compound has a certain set of characteristics.Only chemical breakdown can separate compounds.Compound particles only come in one type.They are identical and homogeneous.ELEMENTS
They solely contain one type of atom, such as Na, H, O, or ClThey possess different qualities from the substances they create. Example: Water is not flammable, but hydrogen and oxygen are.They are the fundamental unit and cannot be further subdivided.SIMILARITIES:
Both are made out of atoms.atoms of these substances are bonded togetherBoth fall under the category of pure substances.both have uniform or homogenous appearance. both of these substances are bonded together.This is how we can understand differences and similarities between elements and compounds through Venn diagram.
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4. The volume of a liquid sample is measured as 15.43 L. We need to know the volume in
mL.
3.
b.
What conversion factor would be used in the calculation?
Calculate the volume in mL.
Conversion factor used to convert volume is 1L = 1000 mL.
15.43L = 15430mL
The same attribute is expressed using a unit conversion but in a different unit of measurement. For instance, time can be expressed in minutes rather than hours, and distance can be expressed in kilometers, feet, or any other measurement unit instead of miles. Measurements are frequently offered in one set of units, like feet, but are required in another set, like chains. A conversion factor is a mathematical equation that facilitates an equal exchange of feet for chains.
A conversion factor is a number that is used to multiply or divide one set of units into another. If a conversion is required, it must be done using the correct conversion factor to get an identical value.
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What frequency corresponds to an absorption line at 527 nm? A. 5.69 x 1014 Hz B. 3.77 x 10¹4 Hz C. 1.76 x 10¹4 Hz D. 6.71 10¹4 Hz
Taking into account the definition of wavelength, frecuency and propagation speed, the correct answer is option A.: The frequency corresponding to an absorption line at 527 nm is 5.69×10¹⁴ Hz
WavelengthWavelength is the minimum distance between two successive points on the wave that are in the same state of vibration. It is expressed in units of length (m).
FrequencyFrequency is the number of vibrations that occur in a unit of time. Its unit is s⁻¹ or hertz (Hz).
Propagation speedThe propagation speed is the speed with which the wave propagates in the medium.
The propagation speed relate the wavelength (λ) and the frequency (f) inversely proportional using the following equation:
v = f×λ
All electromagnetic waves propagate in a vacuum at a constant speed of 3×10⁸ m/s, the speed of light.
Frequency in this caseIn this case, you know:
v= 3×10⁸ m/sf= ?λ= 527 nm= 527×10⁻⁹ m (1 nm= 1×10⁻⁹ m)Replacing in the definition of propagation speed:
3×10⁸ m/s= f× 527×10⁻⁹ m
Solving:
f= 3×10⁸ m/s ÷ 527×10⁻⁹ m
f= 5.69×10¹⁴ Hz
In summary, the correct answer is option A.: The frequency corresponding to an absorption line at 527 nm is 5.69×10¹⁴ Hz
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matter and energy lab report (iced tea debate) (the salty soup debate)
1. What phrase changes did you observe?
2. What kinds of energy transfers did you notice in each scenario?
3. Identify an example of matter and energy conservation in the world around you.
The questions regarding matter and energy lab report (iced tea debate) (the salty soup debate) are answered below.
1. What phrase changes did you observe?
The liquid tea is transformed into a solid. This demonstrates that when the status of the tea is altered, no matter is lost.
The water in the soup evaporates and is converted to vapor in the lab's salty soup.
2. What kinds of energy transfers did you notice in each scenario?
In each of the cases, I observed an electrical unit transferring energy.
3. Identify an example of matter and energy conservation in the world around you.
The table is an illustration of the matter. The act of turning off the lights is an example of energy conservation.
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Application: Address incorrect information and explain correct reasoning
"4s2 is the amount of energy in the atom"
Use and CAPITALIZE the terms
ENERGY LEVEL
SUBLEVEL
NUMBER OF ELECTRON
Explain WHY this misconception is incorrect
Describe what "4", "s" and "2" represent in electron configurations.
a. The statement "4s2 is the amount of energy in the atom" cannot be correct because 4s2 represents part of the electronic configuration of the atom.
b.
the term 4 represents the ENERGY LEVEL of the atom, the term s represents the SUBLEVEL or orbital of the atom, and the term 2 represents the NUMBER OF ELECTRONS in the SUBLEVEL of the atom.What is electronic configuration of an atom?
The electronic configuration of an atom is the spatial arrangement of atoms around the nucleus of the atom into orbitals and subshells.
a. Explain WHY this misconception is incorrect?The statement "4s2 is the amount of energy in the atom" cannot be correct because 4s2 represents part of the electronic configuration of the atom.
Also, the complete electronic configuration must start from a lower energy level.
What is an energy level?An energy level is a level or position around the nucleus where atoms which have that amount of energy can be found.
So, statement "4s2 is the amount of energy in the atom" cannot be correct because 4s2 represents part of the electronic configuration of the atom.
b. Describe what "4", "s" and "2" represent in electron configurations?In the term 4s2,
the term 4 represents the ENERGY LEVEL of the atom, the term s represents the SUBLEVEL or orbital of the atom, and the term 2 represents the NUMBER OF ELECTRONS in the SUBLEVEL of the atom.Learn more about electronic configuration here:
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Aluminum powder is placed in a container filled with chlorine gas.
Answer: aluminium metal comes in contact with chlorine gas in presence of heat, violent reaction get started and Aluminium chloride powder/granule forms. This is an exothermic reaction
Explanation:
According to the chemical changes, when aluminum powder is placed in a container filled with chlorine gas aluminium chloride is formed.
What are chemical changes?Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.
There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical changes:
1) inorganic changes
2)organic changes
3) biochemical changes
During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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Which of the following is a benefit of using a debit card for a purchase?
A. You do not need a pin to withdraw funds or make purchases.
B. You can get cash back.
C. You can share it with friends and family.
D. You can use it as a credit card and pay off your debt on a monthly basis.
Answer: D
Explanation: you can use a debit card for many things besides paying off your debt like avoiding fees and charges, staying accountable for your spending, lower tax payments with credit cards, etc.