The periodic table has the shape it has due to the arrangement of electrons in atoms.
What is Periodic table?This is referred to as the arrangement of the chemical elements in a tabular manner and it consists of 18 groups and 7 periods and are arranged in the order of increasing atomic number which have unique chemical properties.
The periodic table has that type of shape due to it having a resemblance of the pattern of how electrons fill the sub shells which is also the same as how they are arranged in atoms which is therefore the most appropriate choice.
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1. Which wave below has the highest frequency (A-E)?
Gamma ray have the highest frequency.
Gamma ray has the shortest wave length. it has the highest energy and highest frequency. Gamma Radiation region has the highest frequency.
Electromagnetic spectrum is the range of frequencies of the EM radiations and their wavelengths.
Frequency is the number of waves that pass a point at unit time. It can be also defines as the number of cycles or vibrations .Its Formula is,
f=1/T
were f= frequency,
T= time period.
Time period is the duration of time in which an activity occurs.
In Gamma ray their wavelengths are shorter that the nucleus of the atom, because of this they have high frequencies. Their frequencies are greater than 1019Hz.
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How many moles of atoms are there in 65 molecules of calcium chloride?
There are 65 moles of atoms in 65 molecules of CaCl2 ( Calcium chloride )
In stoichiometry,
1 moles of any substance = 6.022 × 1023 molecules or atoms.
x moles of CaCl2 = 65 * 6.022 × 1023
Cross multiplying this equations
x * 6.022 × 1023 = 1 * 65 * 6.022 × 1023
6.022 × 1023x = 65 * 6.022 × 1023
x = 65 * 6.022 × 1023 / 6.022 × 1023x
x = 65 moles.
This means that there are 65 moles in 65 molecules of CaCl2
What is mole?Mole simply refers to the quantity of atoms, molecules or particles that an atom of an element contains.
1 moles of any substance equals 6.022 × 1023 molecules or atoms.
So therefore, there are 65 moles in 65 molecules of CaCl2 ( Calcium chloride )
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The periodic table is arranged by various patterns is there a pattern with regard to iconic change
Cells are not as large as this cube.Explain why in terms of a cell’s surface area-to-volume ratio.
Cells cannot be as large as a cube because the surface area to volume ratio decreases as cell size increases.
What are cells?
The cell is the fundamental structural and functional unit of all living things. Every cell is made up of cytoplasm surrounded by a membrane that includes several biomolecules such as proteins and nucleic acids.
Cells cannot be as large as a cube because the surface area to volume ratio decreases as cell size increases. As a result, if the cell develops beyond a certain point, the cell contents will be unable to cross the cellular membrane as quickly in order to accommodate the increased cellular volume.
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Calculate the velocity of an electron ejected if 690.0 nm of light is applied to the surface. A wavelength of 795 nm has sufficient energy
to eject electrons.
The speed of an electron expelled from a surface when light with a wavelength of 690.0 nm is delivered. A wavelength of 795 nm has sufficient energy to eject electrons is v = 2.886 × 10⁵ m/s.
What are frequency and wavelength?The wavelength, which will also apply to troughs, is the separation between two wave crests. The frequency is measured in cycles per second (Hz), which is the quantity of vibrations that cross a specific area in a second (Hertz). In this article, the relationship between wavelength and frequency is covered.
Briefing:hf = Φ + KE
Φ = Work function is energy required to remove an electron in (J)
h = Planck’s constant = 6.626 x 10⁻³⁴ J • s
f = threshold frequency or higher
KE = maximum kinetic energy of emitted electrons (J)
Electron mass is 9.109 x 10⁻³¹ kg kg and the speed of light is 2.998 x 10⁸ m/s
The energy of a photon of 795 nm light will give the work function Φ.
λ = 795 nm = 7.95 x 10⁻⁹ m
E = (hc/λ) = 2.499 x 10⁻¹⁹ J
Find the energy of a photon with wavelength λ = 336.0 nm = 3.360 x 10⁻⁷ m
m = 9.1 * 10⁻³¹ kg
1/2mv² = hc (1/690×10⁻⁹ - 1/795 × 10⁻⁹)
1/2mv² = 6.62 × 10⁻³⁴ × 2.998 ×10⁸ (10⁹/690 - 0.001258 × 10⁹⁹)
1/2mv² = 19.874 × 10⁻²⁶ (0.001449 × 10⁻⁹ - 0.001258 × 10⁻⁹)
1/2mv² = 19.847 × 10⁻²⁶ (1.44 * 10⁻⁶ - 1.258 × 10⁶)
1/2mv² = 19.847 × 10⁻²⁰ (1.449 - 1.258)
1/2mv² = 19.847 × 10⁻²⁰ × 0.191
1/2mv² = 3.791 × 10⁻²⁰
v² = 3.791 × 10⁻²⁰/m
v² = 7.582 × 10⁻²⁰/9.1 × 10⁻³¹
v² = 0.8332 × 10¹¹
v² = √8.332 × 10¹⁰
v = 2.886 × 10⁵ m/s.
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1. Of the following groups of three, the elements whose properties are
most nearly alike are those having atomic numbers
A) 1, 2, and 3
B) 5, 13, 31
C) 5, 6, and 7
D) 3, 11, and 19
2. Which set of elements is listed in order of increasing metallic
reactivity?
A)Cu, Na, Pb, Sn
B) Sr. Ca, Mg, Be
C) K, Sc, V. Sn
D) B, Al, Ga, In
3. In the periodic table, elements known as metals are
A) in one row
B) in one column
C) on the left side
D) on the right side
4. Of the elements listed below, which element will have the most
vigorous reaction with water?
A) sodium, Na
B) magnesium, Mg
C) potassium, K
D) cesium, Cs
Answer:
Explanation:
1. D
2. B
3. C
4. A
Label each of the digits as significant or not significant.
0.04600
When determining the significance of digits in a number, the general rule is as follows:
1. Non-zero digits are always considered significant.
2. Leading zeros (zeros to the left of the first non-zero digit) are not considered significant.
3. Captive zeros (zeros between non-zero digits) are considered significant.
4. Trailing zeros (zeros to the right of the last non-zero digit) may or may not be significant, depending on whether they serve as placeholders.
In the number 0.04600, we can label each digit as follows:
0.04600
The first zero is a leading zero and is not considered significant.
The digit 0 after the decimal point is considered significant as it is a captive zero.
The digits 4 and 6 are non-zero digits and are considered significant.
The last two zeros are trailing zeros, and their significance depends on whether they serve as placeholders.
If the zeros in 0.04600 are intended to indicate the precision of the measurement or represent significant figures, then the trailing zeros are significant. In this case, all the digits in the number (0.04600) are significant.
However, if the zeros in 0.04600 are not intended to convey the precision or significant figures, and they are just placeholders, then only the first three digits (0.046) are significant, and the trailing zeros are not significant.
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jays instanteous speed at 35 min
Answer
0.6 km/min2
Explanation:
Answer:
?????????
Explanation:
classify matter, compounds, an chemical reaction
The substance is pure matter, it is either an element or a compound. If a substance can be divided into its component elements matter, it is a compound.
If a substance is not chemically pure, it is either a homogeneous mixture or a heterogeneous mixture.
If the composition remains the same throughout, the combination is homogeneous.
The two major categories into which matter can be categorised are pure substances and mixtures. Pure substances and mixtures are the two major categories into which matter may be divided.
A sort of matter known as a pure substance has qualities that are continuous throughout the sample and a stable composition that makes it the same everywhere. A matter is a substance made up of two or more different components.
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Just as energy flows through an ecosystem, matter also moves from organism to organism and from organisms to the environment. Using either a kelp forest or a hydrothermal vent ecosystem as an example, explain how carbon can move through the organisms in that ecosystem
All life on Earth depends on the atom carbon. All plant and animal life involves the ingestion and expulsion of carbon, whether it be for the purpose of producing food or as part of respiration. Carbon is always moving from one location to another.
Explain how carbon can move through the organisms in that ecosystem.
Carbon moves from photosynthetic plants to other consumers in the kelp forest. Carbon is transferred from bacteria to other consumers when at hydrothermal vents.
Ecosystem of the kelp forest:
Oceans are the sallow water ecosystem.driven by photosynthesis and sunlightAlgae and kelp are the main producers.Small fish consume this kelp.Big fish eat little fish.Water-heating vent Ecosystem:
Ecosystem deeppowered by an inorganic compound's energy.Bacteria are the primary producers.These bacteria coexist symbiotically with the primary consumer.
On the principal consumer, the other consumers feed.
As a result, we can infer that carbon is transferred from photosynthetic plants to other consumers in kelp forests. Carbon is transferred from bacteria to other consumers when at hydrothermal vents.
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Watch the video above and write a short summary of some of the major steps.
Make sure to use the following words in your summary:
mandrel
graphite or carbon fiber
flag
blank
epoxy
emery powder
guides
seat
wrap
and anything else you found interesting.
Answer:
Explanation:
5568 is c
Answer:
the carbon fiber hood on the drift car guided eyes to the car and the driver in the seat blankly stairs
How many P atoms are there in 4.35 moles of P?
Answer:
2.6187E24 same as 2.6187 × 10^24
Explanation:
we must use 1 conversion fact 6.02E23
1. Convert to Atoms of P from Moles of P
4.35 × 6.02E23 = 2.6187E24
Please let me know if i need to further eloborate :)
If a patient receives a dose with an activity of 52.6 mCi of technetium-99m for cardiac imaging, how much radioactivity will be left in the patient’s body 96 hours after injection?
Express the radio activity to 3 sig figs and include the units.
The amount of the technetium-99m that will remain in the patient’s body 96 hours after injection is 0.000803 mCi
How to determine the number of half-livesWe'll begin by obtaining the number of half-lives that has elapsed. This can be obtained as follow:
Time (t) = 96 hoursHalf-life (t½) = 6 hoursNumber of half-lives (n) =?n = t / t½
n = 96 / 6
n = 16 half-lives
How to determine the amount remainingThe amount of the radioactivity remaining in the patient's body can be obtained as follow:
Original amount (N₀) = 52.6 mCiNumber of half-lives (n) = 16Amount remaining (N) =?N = N₀ / 2ⁿ
N = 52.6 / 2¹⁶
N = 0.000803 mCi
Thus, the amount remaining is 0.000803 mCi
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DEPARTMENT OF CHEMISTRY
UNIVERSITY OF LIBERIA
1. A 105.5mg sample of a white substance, suspected of being
cocaine (C17H21NO4), forms 2.79.3mg of CO2 and 66.46mg of
water on combustion. Chemical analysis shows that the
compound contains 4.68% N by mass. Would you conclude that
the white solid is cocaIne?
If 105.5mg sample of a white substance, suspected of being
cocaine (C17H21NO4), forms 2.79.3mg of CO2 and 66.46mg of
water on combustion, then the white solid is cocaine.
What is Combustion reaction?A Combustion reaction is defined as the chemical reaction which is generally a fuel that undergoes an oxidation by the reaction by the help of an oxidizing agent, which further results in the emission of energy.
It is mainly an exothermic process. It reaction between fuels and oxidents. Fuels such as wood and coal undergoes an endothermal pyrolysis. This result in the creation of fuel. Types of cocaine:Pure CocaineCrack CocaineSynthetic CocaineBlack CocaineThus, we concluded that the white solid is cocaine if If 105.5mg sample of a white substance, suspected of being
cocaine (C17H21NO4), forms 2.79.3mg of CO2 and 66.46mg of water on combustion.
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Who created the airbag a engineer or scientist or both?
why does oil float in water?
Answer:
Lower density than water
explanationThe answer to the question “Why does oil float on water?” is that oil floats on water because of its lower density than water. Oil and water molecules do not mix with each other due to the polarity of water molecules and the non-polarity of oil molecules. The volumetric mass of a liquid, expressed in cubic meters, is its density.
A farmer weighs out 32.0 kg of chicken eggs. What mass of quail eggs would he need to weigh out to have the same number of eggs in both
mass of quail eggs he need to weigh out to have the same number of eggs in both is 2 Kg
Despite being smaller than chicken eggs, quail eggs are heavier in terms of fat, protein, iron, riboflavin, and vitamin B12. They are more difficult to find and more expensive than chicken eggs, though.In this problem we have to find out mass of quail eggs by taking reference to chicken eggs, so this could be example of relative mass theory.mass of standard chicken egg is 37.44g
mass of standard quail egg is 2.34g
Ratio of mass of eggs 16:1
Given,
farmer weighs out 32 Kg of chicken eggs
let x be the mass of the quail eggs he needed
let's calculate mass of quails eggs he needed
1/16 = x/32
x = 2kg
Therefore, mass of quail eggs he needed to weigh out same number of eggs in both is 2kg
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Which statement about trend lines is true?
Responses
a. A trend line shows the general pattern of the data, but does not try to connect all the data points.
b. A trend line connects the x-axis and y-axis.
c. A trend line connects all points drawn on the graph.
d. Trend lines are used instead of points.
"A" is the correct answer!
The statement stating that a trend line shows shows the general pattern of data but does not connect all points is true.
What are the characteristics of a trend line?The characteristics of a trend line are as follows:
1) It must be explained mathematically-It should support the observations through the mathematical calculations.
2)It must be self-proving-It should be self-explanatory for it's origin.
3)It should be able to make the data look linear.
4)It should be a curved line when the data fluctuates.
5)It should be a visual representation of data.
6)It denotes the overall direction of the data.
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how many helium atoms have have the same mass as four atom of lithium
Answer:
1 helium has 4 atomic mass and 1 sulfur has 32 atomic mas.
An ice bag containing 206 g of ice at 0 °C was used to treat sore
muscles. When the bag was removed, the ice had melted and the
liquid water had a temperature of 16.0 °C.
The heat absorbed is 6.69 kJ.
What is the heat absorbed?We know that heat is a form of energy that exists due to a temperature change. Now heat could be added to or removed from a body. The specific heat capacity is a measure of the heat that is required to raise the temperature of 1 g of a substance by one degree Celsius. The higher the specific heat capacity, the more the heat that could be taken in by a body without a corresponding temperature change.
Now we have the following words of information from the question;
Mass of ice = 206g
Initial temperature = 0 degrees Celsius
Final temperature = 16 degrees Celsius
From the literature, we know that the specific heat capacity of ice is obtained as 2.03 J/g∘C
Thus we could write;
H = m c θ
H = heat absorbed/emitted
C = specific heat capacity
Θ = temperature change
H = 206g * 2.03 J/g∘C * ( 16 – 0)
H = 6.69 kJ
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Missing parts;
An ice bag containing 206 g of ice at 0 °C was used to treat sore
muscles. When the bag was removed, the ice had melted and the
liquid water had a temperature of 16.0 °C. How many kilojoules of heat were absorbed?
A model rocket has a mass of 0.2 kg, with a motor that can provide a force of 100 N. A second model rocket is being built with
the same motor, but it is being designed to accelerate half as much as the first rocket. What kind of change can be made in
the design to achieve this objective? (1 point)
O The mass of the second rocket should be 0.2 kg."
O The mass of the second rocket should be 0.01 kg.
O The mass of the second rocket should be 0.1 kg.
O The mass of the second rocket should be 0.4 kg.
A model rocket has mass 0f 0.2 kg with motor that provide force of 100N. a second rocket model is being built with the same ,but designed to accelerate half as much first .the mass of second rocket should be 0.4 kg.
Mass of first rocket m1 = 0.2 kg
force of first rocket F1 = 100 N
force of first rocket F1= force of second rocket F2
mass of second rocket m2 = ?
acceleration of first rocket = a1
acceleration of second rocket = a2
Force = mass × acceleration
a1 = F1 / m1 and a2 = F2 / m2
F1 / m1 = F2 / m2
F1 = F2
it is given that acceleration of second rocket is half as much as the first rocket,
therefore,
F1 / 2m1 = F1 / m2
m2 = 2m1
m2 = 2 × 0.2kg
= 0.4kg
Hence,A model rocket has mass 0f 0.2 kg with motor that provide force of 100N. a second rocket model is being built with the same ,but designed to accelerate half as much first .the mass of second rocket should be 0.4 kg.
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Draw two cyclic constitutional isomers of trans-1,2-dimethylcyclopentane with the same size ring.
Constitutional isomers, they only differ in the position of the substituents.
What are constitutional isomers?The term isomers refers to the compounds that have the same molecular formula but different structural formulas. This implies that the atom to atom connection and the and the position of the substituents tend to differ quite markedly.
Now when we talk about the constitutional isomers, they only differ in the position of the substituents. The two compounds are essentially the same in the carbon structure but the placement of the substituents do differ. The two cyclic constitutional isomers of trans-1,2- dimethyl cyclopentane with the same size ring are shown in the image attached.
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Why does water freeze at the temp it does in comparison to isopropyl alcohol??
Answer: A hydrogen bonded to an oxygen is more “attractive” than a carbon bonded to an oxygen. So, water molecules are “stickier” than ethanol molecules – making it easier for water molecules to get “stuck”.
Explanation:
a king brings a bar of gold to you and tells you he was told it was real gold, but he is wondering if that is true. his gold bar has a mass of 10 grams and has a volume of 1.05. using the chart below, is the kings gold bar real gold, if not, what metal is it?
The density of the given gold bar is 9.52 .
The density of gold metal used for jewellery is 19.32g/cm³
Given gold bar has mass of 10 grams and has volume of 1.05.
Density = mass /volume ⇒D =10/ 1.05= 9.52 g/cm³
so, the gold bar king has is not pure gold.
The acid test for gold is by rubbing the gold-colored item on black stone, which will leave an easily visible mark. The mark is then tested by applying nitric acid, which dissolves the mark of item that is not gold. If the mark remains same, it is tested by applying aqua regia (nitric acid and hydrochloric acid).
In a nitric acid test, a jeweler places a few drops of the acid on the piece of item and watches for the reaction. With copper, the reaction causes the liquid to turn green, give off fumes, and bubble. This response is called a hard cupric reaction and indicates that the item is not real gold
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Phthalonitrile (C₈H₄N₂) is produced by the ammoxidation of o-xylene (C₈H₁₀) according to the following reaction:
C₈H₁₀(l) + O₂(g) + NH₃(g) → C₈H₄N₂(s) + H₂O(l)
How many moles of water would be produced by the complete ammoxidation of 145.0 grams of o-xylene?
0.6066 moles of water are produced by complete ammoxidation of 145 g of o-xylene.
How are number of moles calculated?Number of moles are calculated by dividing the mass by the molar mass of the substance.In the reaction between o-xylene ,ammonia and oxygen pthalonitrile is produced.
Here, the number of o-xylene is calculated by the above mentioned formula which is 1.365 moles.Then, as per stoichiometry and balanced chemical equation ,
1.365 moles of o-xylene×8 moles of water/1 mole of xylene ×18 g water
=0.6066 moles
Thus,0.6066 moles of water are produced from 145 g of o-xylene.
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Which of the following shows examples of things that convert light energy to electrical energy? (5 points)
•Fan and wind turbine
•Light bulb and blender
•Airplane and human body
•Solar panels and solar cells
Answer:
d) solar panels and solar cells
1. If the absorbance of a 0.000040 M dye sample is 0.43 in a cuvette of path length 1.0 cm, what is the extinction coefficient of the dye?
The molar extinction coefficient of the given dye will be calculated as 10,750 M⁻¹cm⁻¹ which is done by the formula given by Beer Lambert's Law.
According to the Beer-Lambert law, there is a linear relationship between a solution's concentration and absorbance, making it possible to determine a solution's concentration by observing its absorbance.
Beer Lambert's -equation is as follows:
A=ϵbc
where:
A is absorption
ϵ represents the molar extinction coefficient.
b is the length of the path (in cm)
c here refers to molar concentration
The data provided for the stock solution can be used to compute the molar extinction coefficient:
A= ∈bc
0.43= ∈(1cm) ( 0.000040)
∈=10,750 M⁻¹cm⁻¹
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Which subatomic particle has the least mass?
URGENT
Subject/SCIENCE
A. electron
B. proton
C. neutron
D. the atom
Answer:
I thinnk neutron bcoz its is a charge less particle and it's contains less atom so it has less mass
100 points! In the picture below
how many quantum numbers were derived from schrodinger wave equation? a)2 b)3 c)4 d)6
Three quantum numbers were derived from Schrodinger wave equation.
How are quantum numbers derived from Schrodinger equation?Quantum numbers can be obtained while solving Schrodinger wave equation by the boundary conditions which can be applied while solving the equation in order to obtain solution which fits all the physical conditions.
Out of the four quantum numbers the principal quantum number,azimuthal quantum number and magnetic quantum number can be obtained from solving Schrodinger wave equation.
The only quantum number which cannot be obtained from solving the Schrodinger wave equation is spin quantum number,because it is related spin of the electrons which is explained by the Pauli's exclusion principle.
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