Answer:
Lithium
Explanation:
Lithium is in group 1 and group 1 elements have only 1 valence electron on their outer shell.
Beryllium is in group 2 so it has 2 valence electrons.
Boron is in group 3 so it has 3 valence electrons.
Carbon is in group 4 so it has 4 valence electrons.
(PLEASE HELP)"The most abundant isotope of Hydrogen has a mass of 1 amu. Therefore, the average atomic mass on the periodic table for Hydrogen will be 1 amu." Using the terms isotopes, abundance, average atomic mass and weighted mass to explain why this misconception is incorrect and why the abundance(amount) of each isotope of the element affect the average atomic mass.
The statement the most abundant isotope of Hydrogen has a mass of 1 amu is wrong.
What is the average atomic mass?The average atomic mass could be obtained as the sum of the products of the percentage abundance of each of the hydrogen isotopes and the mass of the isotope.
We know that every element has isotopes. In every sample of the atom, there are various isotopes of the element. Thus the average atomic mass must take into account the masses of all these isotopes.
As such, the statement the most abundant isotope of Hydrogen has a mass of 1 amu is wrong.
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PLS HELP ME WILL GOVE BRAINLIEST THIS IS URGENT
What we recall about an event is based on actual details of the particular event, plus______
A. Memory reconstruction
B. General knowledge
C. Expectations
D. All of the above
Answer:
A. Memory reconstruction
If a space shuttle can travel 17,000 miles per hour, how many meters per second does it travel?
If a space shuttle can travel 17,000 miles per hour, then it can travel 7599.68 meters per second.
What is Miles per hour ?The unit miles per hour (which is also denoted by symbol: mph) is a measurement of speed in the United States of America primary systems. It expresses the number of miles one can travelled over the period given as one hour. One Miles per hour equals accurately 1.609344 Kilometers per hour (km/h).What is Meter per Second ?A meter per second (denoted as symbol: m/s) is an SI (International System of Units) denoted unit of speed and velocity. It is denoted as the distance travelled in meters upon the amount of time taken in seconds. It is equal to accurately 3.6 kilometers per hour. It is equal to accurately 3.2808 feet per second. It is equal to accurately 2.2369 miles per hour.Now,
2.2369 miles per hour = 1 meter per second
Hence,
17000 miles per hour = (17000/2.2369) meter per second
= 7599.68 meters per second.
Thus , from the above conclusion we can say that If a space shuttle can travel 17,000 miles per hour, then it can travel 7599.68 meters per second.
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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
The energy of an orange lamp with a frequency of 5.10 x 10¹⁴ Hz is 5.88 x 10⁻⁷ is 3.38 x 10⁻¹⁹ J.
Frequency is defined as the number occurrences of repeated events per unit of time. SI unit is hertz (Hz).
Using the formula,
E = hν
where,
E = energy in joules (J)
h = Planck's constant = 6.63 x 10⁻³⁴ Js
ν = frequency in hertz
Given :
frequency = 5.10 x 10¹⁴ Hz
h = 6.63 x 10⁻³⁴ Js
Putting the values,
E = (6.63 x 10⁻³⁴) x (5.10 x 10¹⁴) J
E = 3.38 x 10⁻¹⁹ J
Therefore, the energy of an orange lamp with a frequency of 5.10 x 10¹⁴ is 3.38 x 10⁻¹⁹J.
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if you can please answer both
Answer: C & D
Explaination:
C because the atomic number increases sequentially and also the nuclear charge
D because as you're moving down a column the valance electrons does not change, only the atomic radius does.
Explain why pure iron is malleable
Answer:
Metals are malleable : They can be bent and shaped without breaking. This is because they consist of layers of atoms that can slide over one another when the metal is bent, hammered or pressed.
Explanation:
Pure iron is a bright silvery white metal which oxidizes (rusts) rapidly in moist air or in water containing dissolved oxygen. It is soft, malleable, and ductile, and is strongly magnetic (ferromagnetic).
state the types of matter
Answer:
they're
Explanation:
solid, liquid and gas
In the model below, what do the green spheres represent?
Nucleus
Protons
Neutrons
Electrons
Answer:
They represent electrons
Explanation:
2.5 g Ti, 1.7 g F2
Express your answer using two significant figures
The theoretical yield of titanium tetrafluoride is 2.79 g
What is the theoretical yield?We know that the theoretical yield is the yield of the product that we can obtain from the stoichiometry of the problem. We now have to go back to the reaction equation and write;
[tex]Ti(s) + 2F_{2} (g) --- > TiF_{4} (s)[/tex]
Number of Ti = 2.5g/48 g/mol = 0.052 moles
Number of moles of F2 = 1.7 g/38 g/mol 0.045 moles
If 1 mole of Ti reacts with 2 moles of F2
0.052 moles reacts with 0.052 moles * 2 moles/1 mole
= 0.10 moles
We can see that F2 is the limiting reactant
If 2 moles of F2 1 mole of [tex]TiF_{4}[/tex]
0.045 moles of F2 produces 0.045 moles * 1 mole/2 moles
= 0.0225 moles
Mass of titanium tetrafluoride = 0.0225 moles * 124 g/mol
= 2.79 g
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What is the energy of an electron in the n = 15 energy state?
A.) 4.91 x 10^-16 J
B.) 3.27 x 10^-17 J
C.) -1.45 x 10^-19 J
D.) Zero. The n = 15 energy state doesn't exist.
E.) -9.69 x 10^-21 J
E. The energy of an electron in the n = 15 energy state is determined as -9.6 x 10⁻²¹ J.
Energy of the electron in the n = 15 energy stateThe energy of an electron in the n = 15 energy state is calculated as follows;
E = -13.6/n²
given n = 15
E = -(13.6/15²)
E = -0.06 eV
Energy of the electron in JoulesE = -0.06 x 1.6 x 10⁻¹⁹
E = -9.6 x 10⁻²¹ J
Thus, the energy of an electron in the n = 15 energy state is determined as -9.6 x 10⁻²¹ J.
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How many moles of ethylenediamine (H2NCH2CH2NH2) are contained in 10.4 ml of 25% ethylenediamine solutions? The density of the solution is 0.950 g/mL.
Moles of ethylenediamine contained in 10.4 ml of 25% ethylenediamine solutions is 0.0388 moles
What is mole?
A mole is defined as 6.02214076 × 10²³ of some chemical unit, be it atoms, molecules, ions, or others.
Given:
volume=9.8 mL
Density= 0.960 g/mL
Percent concentration of solution= 25%
mass of nickel chloride=1.85 g
mass = density * volume
mass = 0.950 g/ml * 9.8 ml
mass = 9.31g
Since it is a 25 % solution of Ethylenediamine
mass of ethylenediamine in 25 moles
moles of ethylenediamine = [tex]\frac{2.33g}{60g/mol}[/tex] =0.0388 moles
Thus, Moles of ethylenediamine contained in 10.4 ml of 25% ethylenediamine solutions is 0.0388 moles.
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Write the name of the alkane with six carbon atoms
Hexane is an alkane with six carbon atoms.
Hexane is an organic substance having the chemical formula C6H14. It is a straight-chain alkane containing six carbon atoms. When pure, it is an odorless, colourless liquid with a boiling point of roughly 69 °C (156 °F). It is a broadly applicable non-polar solvent that is quite safe, mainly unreactive, affordable, and easily evaporable.
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Why can’t calcium ,CA, be broken down into a simpler substance?
What is the density of a metal block that has a mass of 250.00 grams and the length is 16.25 cm, the width is 2.30 cm, and the height is 6.00 cm?
Round to the correct number of significant figures. Do not include the unit in the answer.
The density of a metal block that has a mass of 250.00 grams and the length is 16.25 cm, the width is 2.30 cm, and the height is 6.00 cm is 1.11.
What is density?Density can be defined as the measurement of how tightly a material is pecked together. It is defined as mass per unit volume.
Its SI unit is g/cm3 .
Density can be expressed as
Density = mass/ volume
Volume of metal block = length x width x height
= 16.25 x 2.30 x 6.00
= 224.3 ml
Density = 250.0 / 224.3 g/ml
= 1.11 g/ml
Thus, the density of a metal block that has a mass of 250.00 grams and the length is 16.25 cm, the width is 2.30 cm, and the height is 6.00 cm is 1.11.
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Marjorie is trying to determine the identity of an unknown substance. After running tests, she determines that the substance is insoluble in CCl4 with a density of about 2.2 g/mL. Substance Density Boiling Point Solubility (in water) Solubility (in CCl4) NaCl 2.165 g/mL 1413°C soluble insoluble C10H8 1.14 g/mL 255°C insoluble soluble FeCl3 2.898 g/mL 315°C soluble insoluble SiO2 2.634 g/mL 2590°C insoluble insoluble Using the data above, which of the following substances is most likely Marjorie's unknown? A. FeCl3 B. NaCl C. SiO2 D. C10H8
Marjorie's unknown substance is sodium chloride NaCl.
The substance is insoluble in CCl₄. The density of the substance is 2.2 g/mL.
Solubility:
The fact that the chemical is insoluble in CCl₄ (tetrachloromethane), as indicated in the statement, indicates that the substance is polar in nature. Only C₁₀H₈ of the choices is soluble in CCl₄ since they are both non-polar by nature and related substances dissolve similarly. C₁₀H₈ is therefore disregarded.
Density:
There are now only three possibilities left. SiO₂, FeCl₃, and NaCl. The student discovered that the material has a density of 2.20 g/ ml. This is quite similar to sodium chloride's density (i.e., 2.165 g/mL). As a result, sodium chloride is most likely the material the student is working with.
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How does this illustration demonstrate nonverbal communication? What messages are being communicated?
In the first picture, the person seems nervous and lacks confidence while in the second one the person appears confident.
Nonverbal communication is the transfer of information through body language, facial expressions, gestures, created space, and more.
body language is essential as it makes the communication process more efficient.
facial expression depicts the nervousness and confidence of the person.
gestures involve hand movements.
In the first picture, we can see that the person's posture is bent and looking below.
In the second picture, the person has a straight posture and looks parallel.
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Which graph represents an exothermic reaction?
Answer:
This one also it is opposite of endothermic reaction
What is the volume of foil for 14.45cm times 8.55 cm times 0.550 g
The volume of foil for 14.45cm times 8.55 cm times 0.550 g is
67.95 cm^3
Volume = lenght * breadth * height
= 14.45cm * 8.55 cm * 0.550 cm
= 67.95 cm^3
Volume is the amount of space an object take upA measure of the size of a body or region in three-dimensional space.amount of space occupied by an object L x W x Hcubic centimeters is the basic unit for measuring the volume of solids and gasesvolume is a Three Dimensional existing in three dimensions; having length, width, and height.Cubic Yard is the volume of a cube is one yard on each side.Cubic Meter is the volume of a cube is one meter on each side.To know more about Volume visit :
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A pushing force of 7 N to the right is applied to a book on a table. A frictional force of 3 N is applied in the opposite
direction. In which direction will the book move? (1 point)
O The book will move to the left.
O The book will move to the right
O More information is needed.
O The book will stay stationary.
The book will move to the right.
Hope this helps! Also, if you need help with the other questions regarding this assignment, feel free to check out the study set I made on Quizlet. Thanks and good luck!
Quizlet - "Unit 6: Lesson 2 Newton's First Law QC"
h t t p s : / / q u i z l e t. c o m / 7 3 7 7 5 9 5 5 5 / u n i t - 6 - l e s s o n - 2 - n e w t o n s - f i r s t - l a w - f l a s h - c a r d s / ? n e w
If two forces acts in opposite directions on an object, they will cancel each other in magnitude. Thus if 7N force is applied to the right and 3 N to the left, the net force will be 4 N to the right. Hence, option b is correct.
What is force?Force is an external agent acts on a body to change it from the state of motion or rest. There are various kinds of force namely, frictional force, gravitational force, nuclear force, magnetic force etc.
The force acting on a body to displace from one position to other is called normal force. Frictional force is resistive force which resist the motion of a body.
If two force are acting on a body in same direction, then the resultant force be the sum of magnitudes of these force. If they are acting in opposite direction then the force will be cancelled from each other
Hence, Net force is the difference in magnitude and the direction of net force is the direction of the force which was greater in magnitude.
Therefore, here the net force on the body which undergone two opposite force of 7N to right and 3N to left is 4N to the right.
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Given that the work function of chromium is 4.40 eV calculate the kinetic energy of electrons emitted from chromium surface that is irradiated with ultraviolet radiation of wavelength 200.0 nm.
The kinetic energy of electrons emitted from chromium surface is determined as 2.9 x 10⁻¹⁹ J.
Energy of the emitted photon
The energy of the emitted photon is calculated as follows;
E = hf
E = hc/λ
where;
h is Planck's constantc is speed of lightλ is wavelength of the photonE = (6.626 x 10⁻³⁴ x 3 x 10⁸) / (200 x 10⁻⁹)
E = 9.94 x 10⁻¹⁹ J
Work function of the chromium is joulesΦ = 4.4 x 1.6 x 10⁻¹⁹
Φ = 7.04 x 10⁻¹⁹ J
Kinetic energy of the electronE = K.E + Φ
K.E = E - Φ
K.E = 9.94 x 10⁻¹⁹ J - 7.04 x 10⁻¹⁹ J
K.E = 2.9 x 10⁻¹⁹ J
Thus, the kinetic energy of electrons emitted from chromium surface is determined as 2.9 x 10⁻¹⁹ J.
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1000 in² = ? yd.
Could sb help me out
Answer:
um 27 yards..............
Pb + PbO2 + 2H2SO4 → 2PbSO4 + 2H2O
What is the mole ratio of PbO2 to water
The mole ratio of PbO2 to water is 1:2.
The mole ratio of PbO2 to water, PbO2:H2O, is 1:2 when the reaction stoichiometry is taken into consideration.
The appropriate reaction is:
2 PbSO4 + 2 H2O ⇒ Pb + PbO2 + 2 H2SO4
The following numbers of moles of each component are involved in the reaction according to reaction stoichiometry, which describes the relationship between the amounts of reagents and products in a chemical reaction:
1 mole Pb
1 mole of PbO2
H2SO4: 2 mol
2 moles of PbSO4
Water: 2 moles
Then, you can see that according to the reaction's stoichiometry, 1 mole of PbO2 produces 2 moles of water (H2O).
Therefore,the mole ratio of PbO2 to water is 1:2.
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Based on your reading you know that one elements on the periodic table are listed in order of their atomic numbers. If scientists didn't use that method, hypothesize another wav the periodic table could be organized in an orderly fashion. Write your answer below.
CAN YOU HELP ME RIGHT NOW PLEASE, THANKS YOU
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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A 25 mL sample of matter has a density of 7.9 g/ml., What is the mass of the substance?
Answer:
197.5 grams
Explanation:
To find the mass (g) of the sample, you need to multiply the given volume (mL) by the denisty. You can use the denisty to convert between mL and g because the denisty is a ratio which represents the mass of the sample per every 1 mL. The ratio should be arranged in a way that allows for the cancellation of units (mL should be in the denominator).
Denisty = 7.9 grams/ 1 mL
25 mL 7.9 grams
----------------- x ---------------------- = 197.5 grams
1 mL
**The final answer is not written with the proper sig figs.
how many significant figures are contained in 38.7g, 2x10^18m, 3486002kg, 9.74150x10^4j, 0.0613cm^3,17.0kg, and 0.014g/mL
The number of significant figures contained in the following values are as follows:
38.7g - 32 x 10¹⁸m - 23486002kg - 79.74150 x 10⁴J - 60.0613cm³ - 317.0kg - 30.014g/mL - 2What is significant figures?Significant figures are digits that is meaningful with respect to the precision of a measurement.
Significant figures are digits that is nonzero, followed by a nonzero digit, or (for trailing zeroes) justified by the precision of the derivation or measurement.
According to this question, the number of significant figures contained in the following values are as follows:
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One example of an estuary is
Responses
A The Atlantic Ocean.the Atlantic Ocean.
B Lake Superior.Lake Superior.
C the Potomac River.the Potomac River.
D the Chesapeake Bay.
NO SPAMS OR I WILL REPORT YOU AND BAN YOU IMMEDIATLEY
Answer: D I PROMISE
Explanation:
IVE TOOK THE TEST AND ITS D
What is the weighted average of a nail in the sample data given
Answer:
11.176
Explanation:
4. A steel ball has a diameter of 0.750 cm and weighs 1.765 g. What is its density in grams
per cubic centimeter?
Taking into account the definition of density, the density of the steel ball is 7.99 g/cm³.
Definition of densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space and it allows us to measure the amount of mass in a certain volume of a substance.
The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
density= mass÷volume
Density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
Density in this caseIn this case, you know that:
Mass= 1.765 gDiameter of steel ball= 0.750 cmRadius of a steel ball= diameter of steel ball÷2= 0.375 cmVolume of a steel ball= Volume of a sphere= 4/3×π×r³= 4/3×π×(0.375 cm)³= 0.2209 cm³Replacing in the definition of density:
density= 1.765 g÷0.2209 cm³
Solving:
density= 7.99 g/cm³
In summary, the density of the steel ball is 7.99 g/cm³.
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How I can convert 7 Ms to s
Answer:
Divide the time value by 1000
Explanation:
7 Ms = 0.007s
Round the answer of the following calculation to the correct number of significant figures;
3700 20.1 x 5.60 x 0.0407
The calculation gives the product 17000 to 2 significant figures
What are significant figures in a calculation?Significant figures in a calculation or a number refers to the number of non-zero numbers that are present in a number.
If the number contains a decimal point, the number of non-zero numbers before the decimal point gives the number of significant figures.
However, if a zero occurs between non-zero numbers, it is considered significant.
Significant figures are used in approximation to indicate to what point a set of numbers become significant.
In a calculation, the number significant figure is determined by the number which has the lowest number of significant figures.
In the given calculation, the lowest significant figure is in the numbers 3700 and 5.60
3700 × 20.1 × 5.60 × 0.0407 = 17000 to 2 significant figures
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