⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻
[B] Calorific Value
⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻
Explanation:
The correct answer is [B] Calorific value
Calorific Value ⇒ Amount of energy (heat) produced on burning 1 kg of a fuel completely in air. Which expressed in a unit called kilojoule per kilogram. (kj/kg)
Hence, [B] Calorific value is the answer.
~Lenvy~
Answer:
B. calorific value
Explanation:
Fuel efficiency is measured in terms of calorific value, which is measured in kilojoules per kilogramme. It is the amount of heat produced by the complete combustion of one kilogramme of fuel.
I am joyous to assist you at any time.
Please help! Choose one of the chemical reactions seen in the images on the last activity 1. Explain what happens in terms of energy/ enthalpy change. 2. Is AH negative or positive? The reaction choices are Fire, Photosynthesis, condensation, cokking an egg, or melting ice you can choose any one.
Answer:
there's no images we need pictures
Why is better separation of two liquids achieved by slow rather than fast distillation?.
Answer:
A one mL per minute rate (or slower) is recommended for best results in a fractional distillation; simple can go faster. Slow, gradual distillation essentially allows the best equilibration and heat transfer. If you heat too fast, vapors may not condense as quickly as desired, and may waste some of the column.
1: What type of acid-base reactions are solely defined by how protons are given up or are taken? (0.5pt)
2: What is a Hydroxide ion? (0.5pt)
3: What two products do all acid-base neutralization reactions produce (0.5pt)?
4: Calculate the pH of a 0.25M solution of H3O+ (0.5pt)
5: Calculate the pH of a 6.3x10-8M solution of H3O+ (0.5pt)
6: Look at your answer for 4 and 5 which one is a base? (0.25pt)
7: Look at 4 and 5 which one is a strong acid (be careful with this one I will know that you didn't watch the recording if you get it wrong) (0.25pt)
An acid-base reaction involves the exchange of one or more hydrogen ions H+ which leads to the production of water and salt.
What is a acid–base reaction?An acid–base reaction is a type of chemical reaction that involves the exchange of one or more hydrogen ions H+ means proton, between reactive species. For example, the hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH) produces a solution of sodium chloride (NaCl) and water molecules.
What is a Hydroxide ion?The hydroxide ion is a negatively charged molecule that made up when hydrogen atom bonded to oxygen atom at 1:1 form. It acts as a base that forms ionic compounds when bonded to a positively charged ion molecule.
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What two methods brings conductivity to semiconductors?
Calculate the volume of 0. 410 moles of hydrogen at 47. 0° C and 1. 20 atm, R=. 0821
Answer:
V = 9
Explanation:
n = 0.410
T = 47.0C (must be convert to K by + 273.15) = 320.15 K
P = 1.20 atm
R = 0.08205
V = ?
To solve this equation, we must follow the equation below:
PV = nRT
1.20 x V = 0.410 x 0.08205 x 320.15 K
1.20 x V = 10.8
V = 9
So the answer is 9.
Why is water less dense when it is in a frozen state.
Answer: Your answer is, close to the freezing point, the water molecules start to arrange locally into ice-like structures. This creates some "openness" in the liquid water, which tends to decrease its density.
Hope this helps!
Using information from the periodic table,
explain why radium forms chemical bonds in the
same way as calcium does.
Bothe calcium and radium are second group elements in periodic table with two valence electrons. They exhibit similar physical and chemical properties.
What are groups in periodic table?All the elements in periodic table are classified into different groups and periods. The horizontal rows in periodic table are called periods. From left to right in a period the atomic number increases.
The vertical columns in the periodic table are called groups. Down a group the number of shells increases thereby the atomic size also. A group contains elements with same number of valence electrons and similar physical and chemical properties.
Calcium and radium are in the second group of periodic table and they are called the alkaline earth metals. Both contains two valence electrons and they will participate in chemical bonding by losing these two electrons and thus are divalent cations.
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Pressure is defined as _______.1
Answer:the perpendicular force per unit area
pressure, in the physical sciences, the perpendicular force per unit area, or the stress at a point within a confined fluid.
Explanation:
mark me brainliest!!
6. Identify a factor that is NOT responsible for the formation of sedimentary rocks.
A
glacier
B
magma
o
С
river
D
wind
Answer:
Magma is not a factor responsible for the formation of sedimentary rock.
Explanation:
Write the balanced chemical equation for the combustion of docosane C22H46.
Please help!! :(
which of the following is one part of a chemical formula
1. a number that shows the total atomic mass of the substance
2. the full name of each element shown
3. the symbol of each element in the substance
Answer:
3. the symbol of each element in the substance
Explanation:
A 10 liter tank of CO2 is at a pressure of 3.5 atm and a temperature of
25°C. How many moles of CO2 are in the tank?
The moles of CO2 are in the tank is mathematically given as
n=1.431
What are moles of CO2 are in the tank?Question Parameters:
A 10-liter tank of CO2 is at a pressure of 3.5 atm and a temperature of
25°C.
Generally, the equation for the ideal gas is mathematically given as
PV=nRT
Therefore
n=PV/RT
n=354.638kpa*10/8.314 J/mol·K *298k
n=1.431
In conclusion, moles of CO2 is in the tank is
n=1.431
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A gas at a constant pressure occupies 2.24 L at 52 C. If the sample is cooled United it takes up 1.66 L what is the new temperature?
A. 0.01 K
B. 0.01 C
C. 32 C
D. 241 K
PLS SHOW WORK
Answer:
D is the answer!Explanation:
Using Charles's Law to solve this question: V1/T1 = V2/T2
V1 = 2.24L
T1 = 52C (covert to Kelvin by plus 273.15) = 325.15K
V2 = 1.66L
T2 = ?
V1/T1 = V2/T2 must change to V2×T1/V1 = T2
1.66 x 325.15/2.24 = V2
V2 = 240.96K ≈ 241K
Balance the three equations below by adding the coefficient next to the element(s).
Cr2O3 + 3Mg —> __Cr + 3MgO
__H2 + 1O2 —> 2H2O
2 NaBr + Cl2 —> __NaCl + Br2
Answer:
2Cr
2H2
2NaCl
Explanation:
what is the standard cell notation for a galvanic cell with aluminum and gold electrodes
The standard cell notation for an Galvanic cell with aluminum and gold electrodes is Au(s)| Au³⁺ || Al³⁺| Al (s)
What is an Electrolytic Cell ?A device in which electrical energy is converted into chemical energy or chemical energy is converted into electric energy is called an Electrolytic cell
The electrolytic cell consists of two metallic electrodes and an electrolyte.
In this cell nomenclature, the electrode to the left of the salt bridge is always assumed to be the anode, and the accompanying half-equation is always stated as an oxidation , while right side is cathode and the half equation is Reduction.
Reaction at Anode:Au(s) → Au³⁺(aq) + 3e⁻ ..........(oxidation)
Reaction at Cathode:Au³⁺(aq) + 3e⁻ →Au(s) ..............(reduction)
Therefore, The standard cell notation for an electrolytic cell with aluminum and gold electrodes Au(s)| Au³⁺ || Al³⁺| Al (s)
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Answer:
AI(s) I AI3+(aq) ii Au+(aq) I Au(s)
Explanation:
I just got it wrong
Which statement is true about molecule speed? (1 point)
a. Faster molecules have more energy than slower molecules.
b: Slower molecules are smaller than faster molecules.
c;Slower molecules are oriented better than faster molecules
d:Faster molecules have fewer collisions than slower molecules.
Faster molecules have fewer collisions than slower molecules is True about molecular speed.
What is Molecular speed?Molecular speed refers to the average distance gases or molecules travelled atca particular time rate.
It is valid in ideal gas, where the molecules do not interact with others.
Average molecular speed = Square root (3 (ideal gas constant) * (Temperature)/m)
Therefore, Faster molecules have fewer collisions than slower molecules is True about molecular speed.
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Plants and animals are both multicellular eukaryotes, but only animals are what?
A. Autotrophic
B. Heterotrophic
C. Prototropic
D. Homotrophic
PLEASE HELP I NEED RIGHT NOW 30 POINTS!!
A boat is at sea, where there are sea currents. The boat uses its engine against the currents and is stationary in the water. If the force generated by the boat to push it forward is 24,000 N, what can be said about the force applied by the current? It is zero.
A: It is zero
B: It is greater than 24,000 N.
C: It is less than 24,000 N and greater than zero.
D: It is exactly 24,000 N.
Answer:
D
Explanation:
according to newtons 3rd law action is accompanied by an equal reaction that is equal in magnitude but opposite in direction so magnitude of force should be same
If the force generated by the boat to push it forward is 24,000 N, force applied by the current is exactly 24,000 N. Therefore, the correct option is option D.
What is force?A force in physics is an effect that changes the velocity of a mass-moving object, causing it to accelerate from rest, for example. It is a vector quantity since it's capable of being a push or a pull and always has magnitude and direction. It is denoted by the letter F and is measured in newtons (N), the SI unit of force.
The net force that an object experiences is equivalent to the pace that its momentum varies over time, according to Newton's second law in its original formulation. This equation suggests that an object's acceleration seems inversely proportional to the total force that it experiences if the item's mass remains constant. If the force generated by the boat to push it forward is 24,000 N, force applied by the current is exactly 24,000 N.
Therefore, the correct option is option D.
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In which section(s)/point(s) is the car not moving/at rest?
Answer:
a-b and e-f
Explanation:
No change in distance during these periods as there is change in time.
Answer:
[tex]\huge\boxed{\sf\: e \: -\: f \:\: and \:\: a \: -\: b}[/tex]
Explanation:
The car is not moving / is at rest from section(s) e to f & a to b.
Here, from e to f & a to b, we can see in the distance-time graph that the car shows no motion & is present in the same direction even though the time changes. Hence, we can infer that the car is at rest.
If the line goes up then the speed increases, if it's moving down then the speed decreases & if the line is the same then the car is at rest.
[tex]\rule{150}{2}[/tex]
A sample of sulfur dioxide (SO2) is initially at a temperature of 105C, a volume of 15 L, and a pressure of 1.5 atm. If the volume changes to 25 L and the temperature increases to 181C, what is the new pressure? Show your work.
The new pressure is 1.08 atm
Gas lawsFrom the question, we are to determine the new pressure
Using the General gas equation,
[tex]\frac{P_{1}V_{1} }{T_{1}} = \frac{P_{2}V_{2} }{T_{2}}[/tex]
Where
P₁ is the initial pressure V₁ is the initial volumeT₁ is the initial temperature P₂ is the final pressure V₂ is the final volume T₂ is the final temperatureFrom the given information,
P₁ = 1.5 atm
V₁ = 15 L
T₁ = 105 C = 105 + 273.15 = 378.15 K
V₂ = 25 L
T₂ = 181 C = 181 + 273.15 = 454.15 K
P₂ = ?
Putting the parameters into the equation, we get
[tex]\frac{1.5 \times 15}{378.15} = \frac{P_{2} \times 25 }{454.15}[/tex]
[tex]P_{2}= \frac{1.5 \times 15 \times 454.15}{25 \times 378.15}[/tex]
P₂ = 1.08 atm
Hence, the new pressure is 1.08 atm
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Please someone help me ASAP. This assignment is due in 10 min!!
Answer:
Baseball: PE
Satellite: KE
Sky Diver: KE
Basketball: PE
Arrow: KE
Cliff Diver: PE
Swinging Girl: PE
Grasshopper: PE
Bobsled: KE
Slingshot: PE
Explanation:
For a thrown object, KE and PE are in a sort of equilibrium. As the object climbs towards its highest point, it slows down as the initial KE that initiated the movement runs out. At the highest point, it is out of kinetic energy and full of potential energy. Gravity then pulls on the object and causes it to accelerate, thus giving it more KE. The PE at the top of the arc is because at that point, the object has the potential to fall to earth. This is the reasoning behind the baseball, swinging girl, and grasshopper.
This is, in a way, the same reasoning behind the other potential energy cases as well. The basketball, cliff diver, and slingshot are all about to start moving. The first two will be pulled by gravity and the last one will be propelled be the stretchy slingshot material attempting to snap back into place.
All of the KE examples are due to the object or person actively moving towards or around something. This means that they have kinetic energy--the energy of movement!
Answer:
Baseball: Potential Energy
Satellite: Kinetic Energy
Sky Diver: Kinetic Energy
Basketball: Potential Energy
Arrow: Kinetic Energy
Cliff Diver: Potential Energy
Swinging Girl: Potential Energy
Grasshopper: Potential Energy
Bobsled: Kinetic Energy
Slingshot: Potential Energy
Explanation:
Which planets are the most dense?
the outer planets Jupiter, Saturn, Uranus, Neptune
the inner planets Jupiter, Saturn, Uranus, Neptune
the inner planets Mercury, Venus, Earth, and Mars
the outer planets Mercury, Venus, Earth, and Mars
Answer:
mars is the most dense I believe
Answer:
A the outer planets Jupiter, Saturn, Uranus, Neptune
Explanation:
Please help its urgent
Answer:
C
Explanation:
I picked C because the plant is interacting with the sun which is a nonliving part of the environment.
A, B and D are wrong because seaweed, horses, and trees are living things.
Answer:
C) A plant bending towards the sunlight
Explanation:
A) is incorrect because both the lobster and the seaweed are organisms! Likewise, so are B) and D). D) might seem a little tricky, but ultimately the squirrel is interacting with the tree by living inside it.
A plant bending towards the sunlight, however, is an organism having a response to a factor in its environment.
An entire, intact organism may be preserved in ____ and ____. A. imprints; petrified B. amber ; ice C. casts; trace fossils D. molds , cast
letter B
Explanation:
An entire, intact organism may be
preserved in amber and ice
Bisphenol A is a fat soluble chemical and can get stored in the fat cells of humans. Steven henteges , a spokesman for the American chemistry council said the new data on a consumer exposure to BPA in Canada is very reassuring. Do you think this statement is reassuring? Explain your reason.
(Help me pleaseee!) URGENTLY
Answer:
what do you need to know to decide whether this statement is correct?
10. The hottest stars in the sky are A about 200,000°c B about 5,800°c C about 22.000.
Help this is timed ! help me please
Answer: 22,000 C
Explanation:
Break the numbers apart to make them smaller then multiply and add them back to the big number and there is your answer
Answer:
The hottest known star, WR 102, is one such Wolf-Rayet, sporting a surface temperature more than 35 times hotter than the Sun.
Wolf-Rayet stars come in a variety of flavors.So I'd say B about 5,800°cHope this helps, have an awesome day.What is the percentage of oxygen in carbon dioxide (CO2)
Explanation:
carbon dioxide has a percent composition of 72.7% oxygen, i.e. for every 100 g of carbon dioxide you get 72.7 g of oxygen.
can someone explain this to me please?
Answer:
Concentration of this solution = 12g/60dm3
Concentration of this solution = 0.2g/dm3
Explanation:
Just use 12 ÷ by 60 as they want the simplify answer
A student heats the same amount of two different liquids over Bunsen burners. Each liquid is at room temperature when the student begins. If Liquid 1 has a higher specific heat than Liquid 2, then Liquid 1 will evaporate sooner. evaporate sooner. take longer to increase in temperature. take longer to increase in temperature. condense over a longer period. condense over a longer period. chemically break down at a faster rate.
If Liquid 1 has a higher specific heat than Liquid 2, then Liquid 1 will take longer to increase in temperature because the higher specific heat of a liquid needs more thermal energy for heating a liquid.
What is specific heat?Specific heat of a substance refers to the quantity of heat that is required to raise the temperature of one gram of a substance by one Celsius degree so we can conclude that Liquid 1 will take longer to increase in temperature
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What is the molality of a CaCl2 solution that contains 166.5 g CaCl2 and is dissolved in 3.5kg of water? 0.429 molal 47.6 molal 5.25 molal 1.50 molal
The molality of the CaCl₂ solution given that 166.5 g of CaCl₂ dissolves in 3.5 Kg of water is 0.429 M
What is molality?This is the defines as the mole of solute per unit mass (in Kilogram) of water.
Molality = mole / mass of water (in Kg)
How to determine the mole of CaCl₂The mole of 166.5 g of CaCl₂ can be obtained as illustrated below:
Mass of CaCl₂ = 166.5 gMolar mass of CaCl₂ = 40 + (35.5×2) = 111 g/moleMole of CaCl₂ = ?Mole = mass / molar mass
Mole of CaCl₂ = 166.5 / 111
Mole of CaCl₂ = 1.5 moles
How to determine molality of the solutionThe molality of the CaCl₂ solution can be obtained as illustrated below:
Mole of CaCl₂ = 1.5 molesMass of water = 3.5 KgMolality of CaCl₂ = ?Molality = mole / mass of water (in Kg)
Molality of CaCl₂ = 1.5 / 3.5
Molality of CaCl₂ = 0.429 M
Thus, the molality of the solution is 0.429 M
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