Answer:
18.9 J
Explanation:
The computation of the gravitational potential energy is shown below:
In this question, we use the law of conservation of energy
As we know that
[tex]E=U+K = mgh + \frac{1}{2}mv^2[/tex]
where
U = potential energy
And K = kinetic energy
h = 0
u = 0
Now placing given values to the above formula
[tex]E_i = K_i = \frac{1}{2}mv^2[/tex]
[tex]= \frac{1}{2}(0.25 kg)(12.3 m/s)^2[/tex]
[tex]=18.9 J[/tex]
As we know that
Total mechanical energy equivalent to potential energy
[tex]E_f = U_f[/tex]
However, the mechanical energy is conserved, Ef = Ei, so
[tex]U_f = K_i[/tex]
Therefore the potential energy at the top of the flight is
[tex]U_f = K_i = 18.9 J[/tex]
Answer:
18.9
Explanation:
Calculate relative mass of chlorine and boron by the help of given data Only 30 mins are left
An isotope contains 47 protons, 47 electrons, and 60 neutrons. What is the identity of the isotope?
Answer:
To find the identity of the isotope we must first calculate the mass number
Mass number (M) = A + Z
Where
A is the atomic number
Z is the neutron number
A = 47
Z = 60
M = 60 + 47 = 107
From the options above
The answer is option A
Hope this helps you
15 Ethanoic acid reacts slowly with calcium carbonate.
Which statements explain why an increase in temperature increases the rate oft
1
The activation energy of the reaction is decreased.
2
There is an increase in collision rate.
3
The particles have more energy.
4
There will be fewer successful collisions.
А
1 and 2
B
1 and 3
с
2 and 3
D
2 and 4
Answer:
C
2and3
Explanation:
increase in temperature causes the particles to gain more energy
Globalization refers to the __________. A. idea that politics is becoming more about local community issues B. scientific community's consensus on the human causes of global climate change C. changes in transportation and communication technologies since the 1980s D. growing lack of cultural diversity
Answer:
scientific community's consensus on the human causes of global climate change
Explanation:
From where in the solar system did scientists conduct their spectral anaylses in 1948? How do you know?
Answer:
They conducted it from earth
Explanation:
There had never been anything capable of observing it from space launched at that time because Sputnik wasn't even launched
name the bleaching agent for cloth
Hydrogen peroxide is one of the most common bleaching agents. It is the primary bleaching agent in the textile industry, and is also used in pulp, paper, and home laundry applications.
bleaching agent is a material that lightens or whitens a substrate through chemical reaction. The bleaching reactions usually involve oxidative or reductive processes that degrade color systems. These processes may involve the destruction or modification of chromophoric groups in the substrate as well as the degradation of color bodies into smaller, more soluble units that are more easily removed in the bleaching process. The most common bleaching agents generally fall into two categories: chlorine and its related compounds (such as sodium hypochlorite) and the peroxygen bleaching agents, such as hydrogen peroxide and sodium perborate. Reducing bleaches represent another category. Enzymes are a new category of bleaching agents. They are used for textile, paper, and pulp bleaching as well as for home laundering. Chlorine‐containing bleaching agents are the most cost‐effective bleaching agents known. They are also effective disinfectants, and water disinfection is often the largest use of many chlorine‐containing bleaching agents. They may be divided into four classes: chlorine, hypochlorites, N‐chloro compounds, and chlorine dioxide. Except to bleach wood pulp and flour, chlorine itself is rarely used as a bleaching agent. The principal form of hypochlorite produced is sodium hypochlorite. Other hypochlorites include calcium hypochlorite and bleach liquor, bleaching powder and tropical bleach. The principal solid chlorine bleaching agents are the chlorinated isocyanurates, eg, sodium dichloroisocyanurate dihydrate. Other N‐chloro compounds include halogenated hydantoins, and sodium N‐chlorobenzenesulfonamide (chloramine B). Chlorine dioxide is a gas that is more hazardous than chlorine. Large amounts for pulp bleaching are made by several processes in which sodium chlorate is reduced with chloride, methanol, or sulfur dioxide in highly acidic solutions by complex reactions. Hydrogen peroxide is one of the most common bleaching agents. It is the primary bleaching agent in the textile industry, and is also used in pulp, paper, and home laundry applications. Hydrogen peroxide reacts with many compounds, such as borates, carbonates, pyrophosphates, sulfates, etc, to give peroxy compounds or peroxyhydrates. Peracids have superior cold water bleaching capability versus hydrogen peroxide because of the greater electrophilicity of the peracid peroxygen moiety. Lower wash temperatures and phosphate reductions or bans in detergent systems account for the recent utilization and vast literature of peracids in textile bleaching. The reducing agents generally used in bleaching include sulfur dioxide, sulfurous acid, bisulfites, sulfites, hydrosulfite (dithionites), sodium sulfoxylate formaldehyde, and sodium borohydride. These materials are used mainly in pulp and textile bleaching.
To increase the current in a circuit, which can be increased? A. voltage B. resistance C. interference D. ohms
Answer:
voltage I'm just guessing
Answer:
Option A
Explanation:
Looking at the following formula:
I = V/R
Where V is voltage, I is current and R is resistance
In the above equation, Current and Voltage are in direct relationship such that if I is increased , V is also increased and vice versa. So, To increase the current, voltage should be increased.
300mL of 0.83mol/L acetic acid reacts with 12.0g of sodium carbonate at 21 C and 100.3kPa. What volume of dry carbon dioxide is released in this reaction? Water vapour pressure at this temperature is 2.49 kPa.
Answer:
The volume that carbon dioxide release is 2.83L
Explanation:
The reaction of acetic acid (CH₃COOH) with sodium carbonate (Na₂CO₃) is:
2 CH₃COOH + Na₂CO₃ →Na₂(CH₃COO)₂ + CO₂ + H₂O
Moles of acetic acid and sodium carbonate (Molar mass: 105.99g/mol) in the reaction are:
Acetic acid: 0.300L ₓ (0.83mol / L) = 0.249 moles.
Sodium carbonate: 12g ₓ (1mol / 105.99g) = 0.113 moles.
Based on the chemical equation, 2 moles of acetic acid reacts per moles of sodium carbonate. For a complete reaction of sodium carbonate you need:
0.113 moles Na₂CO₃ ₓ (2 moles CH₃COOH / 1 mole Na₂CO₃) = 0.226 moles of CH₃COOH
As you have 0.249 moles, Na₂CO₃ is limitng reactant.
As 1 mole of sodium carbonate produce 1 mole of CO₂, from 0.113 moles of Na₂CO₃ you obtain 0.113 moles of CO₂
Using PV = nRT, it is possible to find the volume that a gas occupies, thus:
V = nRT / P
n = 0.113 moles
R = 8.314 kPa×L/mol×K
T = 21°C + 273.15 = 294.15K
P = 100.3kPa - 2.49kPa = 97.81kPa
The vapor pressure is subtracted because is the pressure that water exerted.
Replacing:
V = 0.113mol×8.314 kPa×L/mol×K×294.15K / 97.81kPa
V = 2.83L
The volume that carbon dioxide release is 2.83LIf a cell has a nucleus, then it is a
Answer:
It is a eukaryotic cell because prokaryotes don't have a nucleus, rather, they have a nucleoid.
Plz answer this ASAP
Answer:
heymate !
Explanation:
The air pressure is higher at sea level and lower at higher altitudes ( top of the mountain ) .
This is because as we go higher and higher the air in the surroundings become thinner and thinner. And this does not suit you as your blood pressure at high altitudes are comparatively higher compared to the pressure around you at the top of the mountains .
And that is why some of us face breathing issues or nose bleeding due to the imbalance in the atmosphere .
And as we go lower below the sea level the pressure of air around us increases.
And that is why swimmers were tough suits while going down below the sea level, so that their bodies don't get crushed under the extreme pressure on the bottom of the sea .
There are also chances of the skull to get crushed if we don't were the suit while we are under he sea .
hope it would help !
A scanning tunneling microscope allows imaging of _______ particles.
Answer:
Atomic particles
Explanation:
A scanning tunneling microscope is an instrument used to view any surfaces at the levels of an atom. It was invented in the nineteenth century.
How long can a virus be kept on a plastic bag?
Answer: the longest a virus that can be kept on a plastic bag is a few hours to a couple of days.
Explanation: hope that helped!(:
Practice: Solve each of the following problems using dimensional analysis (or another method). Show your work. (Use a periodic table to look up the necessary atomic masses.) A. 75 g KMnO4 = molecules KMnO4 B. 7.23 × 1024 Al atoms = grams Al C. 9.23 × 1023 Au atoms = moles Au D. 125 g H3PO4 = molecules H3PO4 E. 0.75 moles CO2 = total atoms
Answer:
Explanation:
A )
molecular weight of KMnO₄ = 158
75 g KMnO4 = 75 / 158 moles
= ( 75 / 158 )x 6.02 x 10²³ molecules
= 2.857 x 10²³ molecules KMnO4
so 75g KMnO₄ = 2.857 x 10²³ molecules KMnO4
B )
7.23 × 10²⁴ Al atoms = grams Al
72.3 X 10²³ Al atoms = 72.3 X 10²³ / 6.02 X 10²³ moles of Al
= 12 moles of Al
= 12 x 27 gm of Al
= 324 gm of Al .
7.23 × 10²⁴ Al atoms = 324 grams Al
C )
9.23 × 10²³ Au atoms = moles Au
9.23 × 10²³Au atoms = 9.23 × 10²³ / 6.02 x 10²³ moles of Au
= 1.53 moles of Au .
D )
125 g H₃PO₄ = molecules H₃PO₄
125 g H₃PO₄ = 125 / 98 moles of H₃PO₄
= (125 / 98) x 6.02 x 10²³ molecules
= 7.678 x 10²³ molecules of H₃PO₄
125 g H₃PO₄ = 7.678 x 10²³ molecules H₃PO₄
E )
.75 moles of CO₂
= .75 x 6.02 x 10²³ molecules of CO₂
= 4.515 x 10²³ molecules of CO₂.
one molecule of CO₂ = 3 atoms
4.515 x 10²³ molecules of CO₂ = 3 x 4.515 x 10²³ atoms
= 13.545 x 10²³ atoms .
The molecules, atoms, and weight of all elements and compounds has been calculated.
(A) To calculate the molecules of a compound:
Molecules = [tex]\rm moles\;\times\;avagadro\;number[/tex]
Moles = [tex]\rm \frac{weight}{molecular\; weight}[/tex]
Moles of [tex]\rm KMnO_4[/tex] = [tex]\rm \frac{75}{158}[/tex]
Moles of [tex]\rm KMnO_4[/tex] = 0.474
Molecules of [tex]\rm KMnO_4[/tex] = [tex]\rm 0.474\;\times\;6.023\;\times\;10^2^3[/tex]
Molecules of [tex]\rm KMnO_4[/tex] = 2.85 [tex]\rm \times\;10^2^3[/tex]
(B) Weight of Al:
moles = [tex]\rm \frac{atoms}{avagadro\;number}[/tex]
Moles of Al = [tex]\rm \frac{7.23\;\times\;10^2^4}{6.023\;\times\;10^2^3}[/tex]
Moles of Al = 12
Weight of Al = [tex]\rm moles\;\times\;molecular\;weight[/tex]
Weight of Al = 12 [tex]\times[/tex] 27
Weight of Al = 324 grams
(C) Moles = [tex]\rm \frac{atoms}{avagadro\;number}[/tex]
Moles of Au = [tex]\rm \frac{9.23\;\times\;10^2^3}{6.023\;\times\;10^2^3}[/tex]
Moles of Au = 1.53 mol/liters
(D) Molecules = [tex]\rm moles\;\times\;avagadro\;number[/tex]
Moles = [tex]\rm \frac{weight}{molecular\; weight}[/tex]
Moles of [tex]\rm H_3PO_4[/tex] = [tex]\rm \frac{125}{98}[/tex]
Moles of [tex]\rm H_3PO_4[/tex] = 1.275
Molecules of [tex]\rm H_3PO_4[/tex] = 1.275 [tex]\rm \times\;6.023\;\times\;10^2^3[/tex]
Molecules of [tex]\rm H_3PO_4[/tex] = [tex]\rm 7.678\;\times\;10^2^3[/tex]
(E) Atoms of [tex]\rm CO_2[/tex]:
Molecules = [tex]\rm moles\;\times\;avagadro\;number[/tex]
Molecules of [tex]\rm CO_2[/tex] = 0.75 [tex]\rm \times\;6.023\;\times\;10^2^3[/tex]
Molecules of [tex]\rm CO_2[/tex] = 4.515 [tex]\rm \times\;10^2^3[/tex]
1 molecule of [tex]\rm CO_2[/tex] = 3 atoms
4.515 [tex]\rm \times\;10^2^3[/tex] molecules = [tex]\rm 4.515\;\times\;10^2^3\;\times\;3[/tex]
Atoms of [tex]\rm CO_2[/tex] = 13.545 [tex]\rm \times\;6.023\;\times\;10^2^3[/tex]
For more information about the dimensional analysis conversion, refer the link:
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describe two ways in which sodium chloride is different from sodium
Answer:
sodium chloride is a component is a salt made of a metal Sodium and a non chlorine is a alone only and element and very less stable until bonded with them metal like a n, a, k or H
HELPPPPP ME
PLISSSSS
Answer:
pH value of a solution depends on the concentration of hydrogen ions
(pH = -log[H+(aq)].
Hydrochloric acid is a strong acid, while ethanoic acid is a weak acid. Strong acids ionize completely in water (to give ions which includes H+(aq)), while weak acids only ionize partially in water.
Therefore, even if both hydrochloric acid and ethanoic acid are monobasic acids (each molecule can ionize completely to give 1 hydrogen ion), since hydrochloric acid ionizes completely in water and ethanoic acid does not ionize completely, the concentration of hydrogen ions in hydrochloric acid is higher than that of ethanoic acid, leading to a lower pH value for hydrochloric acid, while higher for ethanoic acid.
7.What is the chemical formula for Beryllium Nitride? *
Answer:
BE3N2
Explanation:
What is a closed system? A. A system that allows energy and mass to move in or out of it B. A system that does not allow energy or mass to move I. Or out of it C. A system that allows energy to move in and out but not mass D. A system that allows mass to move in and out but not energy
Answer:
A closed system obeys the conservation laws in its physical description energy only going in and out so the answer is C
Explanation:
hope it helps
Answer:
C
Explanation:
(Help please!!! important question!!!) A neutral atom has an atomic number of 20 and a mass number of 41; how many protons, neutrons, and electrons are found within the atom? (2 points) 21 protons 21 electrons and 20 neutrons, 20 protons 20 electrons and 21 neutrons, 1 protons 20 electron and 20 neutrons, 41 protons 41 electrons and 20 neutrons
Answer: 20 protons,20 electrons and 21 neutrons
Explanation: because the number of protons is the same as the atomic number, and if the atom is neutral it has the same number of protons and electrons. if the mass number is 41 it means that there are 21 neutrons because to find the mass number you have to add protons and neutrons, so 20 + 21 = 41 and to confirm it the neutrons have been subtracted from the mass number and the atomic number, so 41-20 = 21
Which of the following is an amorphous solid?
O
A. Diamond
B. Graphite
O C. Glass
O D. Iron
Answer:
C. Glass
Explanation:
Amorphous solids have a non-crystalline structure and no order. In that case, Diamonds, Graphite, and Iron all have a crystalline structure and order. You are left with C as your answer.
The weight of the buggy was 40N on Mars. When the buggy landed on Mars it rested on an area of 0.025 m2. Calculate the pressure exerted by the buggy on the surface of Mars
Answer:
The pressure exerted by the buggy on the surface of Mars is 1600 pascals.
Explanation:
The pressure is determined by the definition of stress, which is the force exerted by the buggy on the martian surface divided by the contact area of the latter:
[tex]\sigma = \frac{F}{A}[/tex]
Where:
[tex]\sigma[/tex] - Stress, measured in pascals.
[tex]F[/tex] - Force, measured in newtons.
[tex]A[/tex] - Area, measured in square meters.
The force is the weight of the buggy (40 N) and [tex]A = 0.025\,m^{2}[/tex], the stress is now calculated:
[tex]\sigma = \frac{40\,N}{0.025\,m^{2}}[/tex]
[tex]\sigma = 1600\,Pa[/tex]
The pressure exerted by the buggy on the surface of Mars is 1600 pascals.
Carbon monoxide (CO) reacts with hydrogen (H2) to form methane (CH4) and water (H20).
CO(g) + 3H2(g) + CH4(g)+H20(9)
The reaction is at equilibrium at 1,000 K. The equilibrium constant of the reaction is 3.90. At equilibrium, the concentrations are as
follows.
[CO] = 0.30 M
[H2] = 0.10 M
[H20] = 0.020 M
What is the equilibrium concentration of CH, expressed in scientific notation?
0.0059
5.9 x 10-2
0.059
5.9 x 102
Answer: The equilibrium concentration of [tex]CH_4[/tex] , expressed in scientific notation is [tex]5.9\times 10^{-2}M[/tex]
Explanation:
Equilibrium constant is the ratio of the concentration of products to the concentration of reactants each term raised to its stochiometric coefficients.
The given balanced equilibrium reaction is,
[tex]CO(g)+3H_2(g)\rightleftharpoons CH_4(g)+H_2O(g)[/tex]
At eqm. conc. (0.30) M (0.10) M (x) M (0.020) M
The expression for equilibrium constant for this reaction will be,
[tex]K_c=\frac{[CH_4]\times [H_2O]}{[CO]\times [H_2]^3}[/tex]
Now put all the given values in this expression, we get :
[tex]3.90=\frac{x\times (0.020)}{(0.30)\times (0.10)^3}[/tex]
By solving the term 'x', we get :
x = 0.059 M= [tex]5.9\times 10^{-2}M[/tex]
Thus, the concentrations of [tex]CH_4[/tex] at equilibrium is :
Concentration of [tex]CH_4[/tex] = (x) M = [tex]5.9\times 10^{-2}M[/tex]
The equilibrium concentration of [tex]CH_4[/tex] , expressed in scientific notation is [tex]5.9\times 10^{-2}M[/tex]
Answer:B
Explanation:B
Earth's gravitational potential energy: GPE = mgh = Gravity (9.81m/s2)
Mass (kg) x Height (m)
Kinetic energy: KE 1 / m2
How would you calculate the gravitational potential energy of a 2 kg bottle of
soda falling off of a kitchen table that is 0.76 m tall?
Answer:
14.91 Joules
Explanation:
First you just plug stuff into the potential energy due to gravity equation [Potential Energy=acceleration due to gravity * Mass * Height].
PEg= (9.81m/s2)*(2kg)*(0.76 m) <<<<<<<<
(Just plug in all the values)
We get PEg= 14.91 Joules
Physics is pretty much just converting one unit to another, Joules are also known as (kg m2/s2)
HURRY IM ON A TIMER
Which types of waves requires matter to carry energy?
A.electromagnetic waves only
B.mechanical waves only
C.electromagnetic and mechanical waves
D.longitudinal and electromagnetic waves
Answer:
B: Mechanical waves only.
Explanation:
'Mechanical waves require medium in order to transport their energy from one location to another.'
Hope this helps!
Answer:
Mechanical waves requires matter to carry enegry.
As mechanical waves are defined as the wave which requires any medium to transfer enegry from one place to another place.
so, the answer is Mechanical waves.
hope it helps..
Reptiles, amphibians, and fish are all cold-
blooded animals. Their body temperatures are
determined by their surroundings. How does a
cold blooded animal's ability to digest food
change in colder temperatures?
It digests food at the same rate regardless of
the temperature.
It digests food more quickly at lower
temperatures.
It digests food more slowly at lower
temperatures.
Answer:
it digests food more slowly at lower temperatures
It digests food more slowly at lower temperatures.
• Based on the given question, it can be stated that the cold blooded animal's surroundings determine the temperature of their body and as an outcome, they possess the tendency to eat food differently.
• It can be said that the cold blooded animals like amphibians, reptiles, and fishes all digest food more gradually at the time of cold in comparison to warmer climates.
Thus, a cold blooded animal's tendency to digest food varies in colder temperatures as they digests food more slowly at lower temperatures.
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You have 3.00 m3 of a fixed mass of a gas at 150 kPa. Calculate the pressure if the volume is reduced to 1.20 m3 at a constant temperature.
Answer:
Solution:
Explanation:
V1 = 3.00m3
T1 = 150kPa
V2 = 1.20m3
T2 = x
As ,
V1 = V2
T1 T2
3.00 = 1.20
150 X
3.00 x X = 150 x 1.20
3.00X = 180
X = 180
3.00
X = 60 kPa
The final pressure can be calculated using Boyle's law. The final pressure of the gas if the volume is increased from 3 m³ to 1.20 m³ with an initial pressure of 150 kPa is obtained as 375 kPa.
What is Boyle's law?Boyle's law states that at constant temperature, the volume of a gas is inversely proportional to the pressure of the gas. Hence, volume decreases with increase in pressure and vice versa.
If P₁ and V₁ be the initial pressure and volume respectively and P₂, V₂ be their final quantities, then the relation between them can be written as:
P₁ V₁ = P₂ V₂ .
It is given that the initial volume and pressure is 3 m³ and 150 kPa and the final volume is 1.20 m³ . Then, the final pressure is calculated as follows:
P₂ = P₁ V₁ / V₂
= (3 m³ × 150 kPa) / 1.20 m³
= 375 kPa
Hence, the final pressure of the gas will be 375 kPa.
To find more on Boyle's law, refer here:
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#SPJ2
How does the government control scientific research
Answer:
The government allocates a budget for research every year. The spending of that money is determined by government priorities. Some of the money is spent directly, in government-funded research centers.
Other money is distributed to other research institutions.
Money spent by other institutions for research has no government oversight.
Explanation:
List 15 different things made of plastic in your house group them as thermoplastics and thermosetting plastics?
Answer:
Things made of thermoplastics
1) Plastic chairs
2) Plastic table
3) Plastic cups and plates
4) Nylon bags
5) Plastic cabinet
6) PVC pipes-
7) Internal electronic component such as gears
8) Vehicle dashboard
Things made of Thermosetting plastics
1) Electrical insulation
2) Handles of electrical fittings
3) Plastic hoses
4) Electric switch covering
5) Coverings of electronic gadgets
6) Silicone in adhesives
7) Keyboard
Explanation:
A plastic polymer material that becomes soft upon heating and hard once again when cooled such that the material can be repeatedly or cyclically cooled and heated numerous times with its chemical and physical properties remaining constant is known as a thermoplastic.
A plastic, polymer or resin that is hardened from its soft or liquid state by curing irreversibly such that it cannot be made soft again without a change in its chemical properties is known as a thermosetting plastic.
2. The change in internal energy for the expansion of a gas sample is -4750 J. How much work is done if the gas sample loses 1125 J of heat to the surroundings? Is this work done by the gas or done by the surroundings?
Answer:
The work done by the gas expansion is 5875 J,
Since the work done is positive, the work is done by the gas on the surroundings.
Explanation:
Given;
change in internal energy, ΔU = -4750 J
heat transferred to the system, Q = 1125 J
The change in internal energy is given by;
ΔU = Q - W
Where;
W is the work done by the system
The work done by the system is calculated as;
W = Q - ΔU
W = 1125 - (-4750)
W = 1125 + 4750
W = 5875 J
Since the work done is positive, the work is done by the gas on the surroundings (energy flows from the gas to the surroundings).
Therefore, the work done by the gas expansion is 5875 J
Next, break down the equation shown into the skeletal half-reactions for oxidation and reduction. Which of
these pairs shows the two skeletal half-reactions with their correct assignments?
reduction half reaction: HNO, NO
oxidation half reaction SH,SO,
oxidation half reaction: HNO3 -> NO
reduction half reaction: SH2SO,
reduction half reaction: HNO3 -H,SO,
oxidation half reaction S -> H2SO4
Answer:
Its answer A
Explanation:
I just took the test
Answer:
A:
reduction half reaction: HNO3-> NO
oxidation half reaction S->H2SO4
Explanation:
Primary succession is most likely caused by?
Answer:
volcanic eruption.
mark my answer as brainlest......