The atomic mass of the element X is 56 and the element can be seen to be iron.
What is the identity of element X?In this problem, we are given a compound to obtain the identity of the unknown element therein.
We already can relate that;
Number of moles = mass/molar mass
Number of moles Br = 0.04806 moles
Molar mass of Br could be obtained as 79.9 g/mol
We have;
Mass = Number of moles x molar mass
= 0.04806x 79.9
= 3.84 g
Mass of X = 4.735 - 3.84
= 0.895 g
Given that there are 3 moles of Br for every 1 mole of X. We have 0.04806 mole of Br present in 4.735 g, then the number of moles of X present would be:
0.04806/3 = 0.01602 moles
Molar mass = mass/mole
= 0.895/0.01602
= 55.87 or 56 g/mol
Hence, the element X is iron
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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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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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what consumer in the food chain is going to have to eat the most food tomeet their energy needs?
Answer:
Secondary consumer
Explanation:
The organism that eats the primary consumer to get the energy is known as the secondary consumer. They are generally meat-eaters—carnivores. Tertiary consumers eat primary consumers and secondary consumers. They are carnivore-eating organisms, like eagles or big fish.
Answer:
the producers will eat the most food
what is one of the most common causes of injury in the laboratory
Answer:
Chemical Spilling And Heat burns
Explanation:
One of the most common injurys in science labs is various chemical falling due to carless opening or handling
Heat burns are also evenly matched along with chemical spill this is cuased due to burners being left open or not wearing th eprober equipment to be next to heat
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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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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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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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). "
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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stellar equilibrium is a balance between what two things
Answer:
Outward pressure and inward gravity
Explanation:
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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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.
Which of the following statements best compares nuclear power and hydropower based on their rates of renewal?
Hydropower has a faster rate because water is continuously being recycled through the hydrogeological cycle.
Nuclear power has a faster rate because all elements are spontaneously radioactive and are a source of nuclear energy.
Hydropower has a slower rate because a large volume of water vapor that evaporates takes several years to return to water cycle.
Nuclear power has a slower rate because the nuclear waste produced is not radioactive and thus cannot be used further as a fuel.
Hydropower is best compared to nuclear power based on their rates of renewal.
Because water is continually regenerated through the hydrogeological cycle, hydropower has a higher rate.Because all elements spontaneously produce radioactive material, which is a source of nuclear energy, nuclear power has a higher rate.Because it takes a significant amount of evaporated water several years to return to the water cycle, hydropower has a slower rate.Because the nuclear waste generated by nuclear power cannot be recycled as fuel and is not radioactive, it produces waste at a slower pace.What is hydropower's primary source?Water in motion generates hydroelectricity, namely the winter and spring runoff from mountain streams and crystal-clear lakes. Water can be utilized to turn turbines and generators that produce power when it is falling due to gravity.To learn more about hydropower visit:
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A __________ is an area of land that rises very high above the land around it.
lake
mountain
plain
river
Answer:
Mountain
Explanation:
Why is the percentage of food eaten a good number to use? Explain.
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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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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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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There are only two naturally-occuring stable isotopes of lithium, the masses of which are listed in the table below. Use whatever data you need from the ALEKS Periodic Table to calculate the natural abundance of each isotope and complete the table.
The natural abundance of each isotope of lithium:
For [tex]^{6} Li[/tex] = 7.5%
For [tex]^{7} Li[/tex] = 92.5%
Due to the fact that lithium only has two stable isotopes, it follows that only two isotopes contribute to its average atomic mass.
Then, if we take x the proportional abundance of [tex]^{6} Li[/tex] it is possible to state that the decimal abundance of [tex]^{7} Li[/tex] need to be equivalent to 1−x.
Lithium's typical atomic mass will now be equal to =
avg. Atomic weight Li = Atomic weight of [tex]^{6} Li[/tex]× quantile abundance of [tex]^{6} Li[/tex]+ Atomic weight of [tex]^{7} Li[/tex]× quantile abundance of [tex]^{7} Li[/tex]
Since you are aware that the average atomic mass of lithium is
6.941 you can construct the equation as follows.
6.941 = 6.015 × x + 7.016 × (1-x)
x = 0.075
This is the decimal abundance of [tex]^{6} Li[/tex]. The decimal abundance of [tex]^{7} Li[/tex] is 1 - 0.075 = 0.925.
Percent abundances :
For [tex]^{6} Li[/tex] = 7.5%
For [tex]^{7} Li[/tex] = 92.5%
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a solution with a ph of 11.7 is how many time more basic than a solution with a ph of 8.7
Answer:
1000
Explanation:
A solution with a pH of 11.7 is ____ times more basic (alkaline) than a solution with a pH of 8.7 1000
what is the difference between copper bromide and copper chloride solution when exposed to the flame test ?
Answer:
copper chloride is green
and bromide copper is gray
Explanation:
because the copper(II) ion
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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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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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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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.
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)
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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- 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:
The photoelectron spectra above show the energy required to remove a 1s electron from a nitrogen atom and from
an oxygen atom. Which of the following statements best accounts for the peak in the upper spectrum being to the
right of the peak in the lower spectrum?
(A) Nitrogen atoms have a half-filled p subshell.
(B) There are more electron-electron repulsions in oxygen atoms than in nitrogen atoms.
(C)
Electrons in the p subshell of oxygen atoms provide more shielding than electrons in the p subshell of
nitrogen atoms.
(D) Nitrogen atoms have a smaller nuclear charge than oxygen atoms.
ntc immediately following it Select the one
Answer:
:)
Explanation:
Nitrogen atoms have a smaller nuclear charge than oxygen atoms. The correct option is D.
What is photoelectron spectra?By ionization, a photoelectron spectrum can reveal the relative energies of occupied molecular orbitals. (i.e. electron ejection).
A photoelectron spectrum can also be used to calculate the energy gap between vibrational levels of an electronic state.
Photoelectron spectroscopy is a useful tool because it allows scientists to investigate the properties of matter (gases, solids, and liquids) by measuring electron orbital energies.
The photoelectric effect is the process by which electrons are ejected or released from the surface of materials (usually metals) when light falls on them.
The photoelectron spectra show how much energy it takes to remove a 1s electron from a nitrogen atom and an oxygen atom. The nuclear charge of nitrogen atoms is lower than that of oxygen atoms.
Thus, the correct option is D.
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