An alternative method for the arrangement of elements is by the use of atomic masses of the elements.
What is the periodic table?The periodic table is an arrangement of elements based on increasing atomic number. This is what is called the modern periodic law. Before the advent of the current periodic table, there have been many other kinds of periodic table.
In the periodic table as it is now, there are about 118 elements that are arranged in groups and periods. The groups contain elements that are chemically similar and could react in the same way while the periods contain elements that have the same number of shells.
However, we know that an alternative method for the arrangement of elements is by the use of atomic masses of the elements. This was the method that was used arrange the old periodic table. However, this method did not account for periodic trends.
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Which of the following is a form of identity fraud?
A. Chipping
B. Skimming
C. Chirping
D. Skipping
Answer:
B. Skimming
Explanation:
Skimming is an electronic method of stealing a victim's credit card number and then using the information to make fraudulent purchases.
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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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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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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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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If you change the atomic mass to a whole number and subtract the atomic number from it, what does the answer symbolize?
Answer:
Based on the mass number of an element, one can determine the number of neutrons that element has. The identity of an element implies its number of protons, and thus one can subtract atomic number from mass number to determine the number of neutrons in the atom's nucleus.
Which of the following elements is most likely to have an oxidation state of
+2?
A. Strontium (Sr)
B. Oxygen (0)
C. Sodium (Na)
D. Chlorine (CI)
The element from the list that is most likely to have an oxidation state of +2 is Strontium (Sr).
What is oxidation state?The oxidation state of an element of an atom refers to the total number of electrons that is gainable or losable in order to form a bond with another atom.
The oxidation state of an atom is also known as its oxidation number.
Strontium with atomic number 38 and electron configuration of [Kr]5[tex]s^2[/tex] has 2 losable electrons in order to form a bond.Oxygen with atomic number 8 and electron configuration of [He] 2s²2p⁴ has 2 gainable electrons in order to form a bond.Chlorine with atomic number 17 and electron configuration of [Ne] 3s²3p⁵ has 1 gainable electron in order to form a bond.Thus, the element that is most likely to have an oxidation state of +2 is Strontium (sr).
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what is photosynthesis
Answer:
Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.
Answer: Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's activities.
Explanation:
A __________ is an area of land that rises very high above the land around it.
lake
mountain
plain
river
Answer:
Mountain
Explanation:
Anything which deteriorates the quality of air around us is called
A. a gas
B. a molecule
C. a pollutant
D. a component
Answer: The answer is C, a pollutant.
Explanation:
The word pollutant comes from the word pollution, pollution is when a chemical makes the air toxic.
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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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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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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What is the molar mass of 56.75 g of gas exerting a pressure of 2.87 atm on the walls of a 5.29 L container at 230 K
Molar mass is thus 70.6 g/mol.
We must first determine how many moles of gas are there in the container.
PV = nRT
where;
P - pressure = 290 802.75 Pa = 2.87 atm x 101 325 Pa/atm
Volume: 5.29 x 103 m3, or V.
quantity of moles, n
R, the global gas constant, is 8.314 Jmol K-1.
Temperature is 230 K, or T.
using these values as a substitute in the equation
n x 8.314 Jmol 1 K x 230 K = 290 802.75 Pa x 5.29 x 10 3 m3
n = 0.804 mol
the molar mass = [tex]\frac{mass present}{number of moles}[/tex]
the molar mass of gas =[tex]\frac{56.75g}{0.804 mol}[/tex]
therefore molar mass is 70.6 g/mol
Molar mass is 70.6 g/mol as a result.
The molar mass of a chemical compound is defined as the mass of the sample divided by the amount, or the number of moles, in the sample, measured in moles. A substance's molar mass is a bulk characteristic rather than a molecular one.
The phrases "molecular mass" and "formula mass," which refer to molar mass specifically for molecular compounds, are commonly used interchangeably; nevertheless, the definitions provided by the most trustworthy authorities vary.
The molar mass is the appropriate unit for converting between a substance's mass and quantity in bulk quantities.
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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). "
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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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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- 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:
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 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
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
the boiling point of butane is less that that of hexane because of increase in
Hexane, CH3CH2CH2CH2CH2CH3, has a boiling point of 69ºC, while butane has a boiling point of 0.4ºC. Both molecules are nonpolar. Describe the significant difference between these two substances' boiling points.
Intermolecular attractions are the likely cause of the significant disparity in the boiling points of butane and hexane. Due to its size (molecular weight = 86) and higher number of electrons and nuclei, hexane has stronger and more durable van der Waals forces. With a molecular weight of 58, butane is a smaller molecule with less van der Waals forces.
Hexane has a higher boiling point than butane as a result, while butane has a lower boiling point.
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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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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
Why is the percentage of food eaten a good number to use? Explain.
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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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 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 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
What is the oxidation state of O in NO₂?
OA. +2
OB. -2
O C. O
OD. -4
Answer:
Let it be x
[tex]{ \tt{ (oxidation \: state \: of \: nitrogen) + 2x = overall \: charge}} \\ { \tt{ - 4 - 2 x = 0}} \\ { \tt{2x = - 4}} \\ { \tt{x = - 2}}[/tex]