Answer:
the atomic weight of mass is 196.96657 u
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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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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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
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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For the reaction shown, identify the oxidation half-reaction and the reduction half-reaction. KNO3 → KNO2 + O₂ Which pair of half-reactions represents the balanced half-reactions? N5+ + 2e →N³+ 0² →0₂ + 4e 2N5+ + 4e¯ → 2N³+ 20²- → 0₂ +4e 4N5+ 2e4N³+ 20² → 20₂ + 4e¯
N5+ + 2e →N³
here Nitrogen gains electron so, its reduction half-reaction
20²- → 0₂
here oxygen loss electron so, its oxidation half-reaction
20² → 20₂ + 4e¯
here oxygen loss electron so, its oxidation half-reaction
2N5+ + 4e¯ → 2N³
here nitrogen gains electron so, its reduction half-reaction
When an atom loses electrons, it is said to be oxidising; when it acquires electrons, it is said to be reduced. A redox reaction occurs when both of these reactions take place at the same time.When a molecule oxidises, it implies it either gives or loses electrons to another molecule. As a result, the reaction between a molecule of oxygen and a molecule of hydrochloric acid may be shown below. Because it has to combine with hydrogen to create a proper molecule, the oxygen molecule in this process is unstable. Four extra hydrogen molecules are available for disposal in the hydrogen chloride molecule. Thus, although the hydrochloric acid transforms into chlorine gas, all of the hydrogen from the acid unites with the oxygen molecule to form water.To know more about oxidation visit : https://brainly.com/question/13003361
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Will mark BRAINLYEST
When you place your hand in water it appears to be larger. explain why this happens
Answer:
because the water is like a magnified glass Its on your hand and your hand apears bigger
Explanation:
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:
38.7g - 32 x 10¹⁸m - 23486002kg - 79.74150 x 10⁴J - 60.0613cm³ - 317.0kg - 30.014g/mL - 2Learn more about significant figures at: https://brainly.com/question/14359464
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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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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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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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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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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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In the model below, what do the green spheres represent?
Nucleus
Protons
Neutrons
Electrons
Answer:
They represent electrons
Explanation:
1000 in² = ? yd.
Could sb help me out
Answer:
um 27 yards..............
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
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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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 I can convert 7 Ms to s
Answer:
Divide the time value by 1000
Explanation:
7 Ms = 0.007s
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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Which graph represents an exothermic reaction?
Answer:
This one also it is opposite of endothermic reaction
The density of copper is 8.92g/cm³. If a 10.00g sample is placed in a graduated cylinder that
contains 15.0mL of water, what is the total volume?
The total volume of sample with given density and mass of copper is 16.815 cm³.
Equation :volume of copper = mass / density
v = 10.00g / 8.92g/cm³
v = 1.121 cm³
So to calculate total of volume of given sample,
Total volume = Volume of copper x Volume of water
V = 1.121 x 15.0
V = 16.815 cm³
What is volume ?A solid shape's capacity is measured using volume, a three-dimensional quantity. It implies that a closed figure's volume determines how much three-dimensional space it can occupy. A derived unit called the cubic meter (m3) serves as the SI unit of volume. The cubic decimeter is referred to as a "liter" (L) (dm3).
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state the types of matter
Answer:
they're
Explanation:
solid, liquid and gas
(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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3. In a chemical reaction, the final amount of the products is determined by the
A. Universal Gas Law
B. catalysts involved
C. air pressure
D. temperature
E. limiting reactant
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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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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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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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.
Why can’t calcium ,CA, be broken down into a simpler substance?
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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