during which two processes does a substance release energy
a) freezing and condensation
b) freezing and melting
c) evaporation and condensation
d) evaporation and melting
Answer:
a) freezing and condensation
Explanation:
During Freezing and condensation , substance release energy because these both are exothermic reactions.
What is freezing?The phase shift of a material from a liquid to a solid form is referred to as freezing. For example water changes to ice.This is a phase transition phenomena, which occurs when a substance changes from one state of matter to another.What is condensation?Condensation is the transformation of water vapour into liquid water. For example fluffy clouds floating over your head. When the water droplets in clouds mix, they become heavy enough to pour down on your head.What are the exothermic reactions?A process in which energy is emitted in the form of light or heat is known as an exothermic reaction. As a result, rather of absorbing energy from the surroundings as in an endothermic reaction, energy is transferred into the surroundings in an exothermic reaction. The change in enthalpy (H) in an exothermic process is negative.Hence, the correct option is A.
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Rutherford tested the ____________ atomic model by experimentation and found that it was _____________.
a. Nuclear; correct
b. Bohr; correct
c. Plum Pudding; incorrect
d.Dalton; incorrect
Answer:
C Plum Pudding; incorrect
Explanation:
Ernest Rutherford tested it through his famous gold foil experiment and found that it was incorrect.
When should you avoid looking directly at magnesium burning?
Answer:
Magnesium also reacts with nitrogen in the air to produce some magnesium nitride (Mg3N2). Safety: Do not look directly at the burning magnesium due to the intensity of the light. A dry-powder fire extinguisher should be available. Disposal: Once cooled the solid magnesium products can be thrown in the trash.
Explanation:
If an isotope has 85 protons, 110 neutrons, and 85 electrons, it has a mass number of what?
Answer:
Mass number = 195
Explanation:
Isotope:
An atom of an element that contain same atomic number but different atomic mass.
The difference in atomic mass is due to the different number of neutrons present, but the number protons and electrons are remain same.
In given isotope of an atom there are 85 protons and 85 electrons while number of neutrons are 110.
The number of electron or number of protons are called atomic number while mass number of an atom is sum of protons and neutrons. The umber of protons and electrons are always equal to make the atom electrically neutral and when an atom loses its valance electron the number of protons increases and thus positive charge increased and atom form cation.
Mass number = number of protons + number of neutrons
Mass number = 85 + 110 = 195
Which cells carry nutrients from food to the rest of the cells in the body?
Responses
blood cells
stomach cells
nerve cells
muscle cells
Answer:
Blood Cells
Explanation:
Capillaries are so small that blood cells can only move through them one at a time. Oxygen and food nutrients pass from these capillaries to the cells. Capillaries are also connected to veins, so wastes from the cells can be transferred to the blood.
Why is the aqueous environment of a cell important?
It prevents organelles in a cell from sticking together.
It allows cells to bend and change shape as needed.
It provides a constant energy source for a cell. I
t's required for all chemical reactions in a cell.
Answer: it's required for all chemical reactions in a cell.
Explanation: took the test. please vote :-)
The aqueous environment is vital for cellular functions, facilitating chemical reactions, maintaining structure, and enabling cellular processes.
Option (D) is correct
The aqueous environment within a cell, primarily composed of water and various dissolved molecules, plays a crucial role in cellular processes. It enables and supports a multitude of chemical reactions necessary for cellular metabolism, growth, and maintenance.
Water's solvent properties allow biochemical reactions to take place, aiding in nutrient transport, waste removal, and cell signaling. Moreover, water's cohesive and adhesive forces contribute to maintaining cellular structure and preventing organelles from sticking together, ensuring proper compartmentalization and functioning.
While it does not provide energy directly, the aqueous environment indirectly sustains cellular energy processes by facilitating reactions within the cell. Additionally, the fluidity of the aqueous environment enables cells to change shape, promoting functions such as migration, phagocytosis, and division.
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The complete question is:
Why is the aqueous environment of a cell important?
A) It prevents organelles in a cell from sticking together.
B) It allows cells to bend and change shape as needed.
C) It provides a constant energy source for a cell. I
D) t's required for all chemical reactions in a cell.
3. A polyatomic ion is formed from more than one atom.
True or false
Answer:
true
Explanation:
If you dilute 19.0 mL of the stock solution to a final volume of 0.310 L , what will be the concentration of the diluted solution?
Answer:
[tex]M_2=0.613M_1[/tex]
Explanation:
[tex]M_1[/tex] = Concentration of stock solution
[tex]M_2[/tex] = Concentration of solution
[tex]V_1[/tex] = Volume of stock solution = 19 mL
[tex]V_2[/tex] = Volume of solution = 0.31 L= 310 mL
We have the relation
[tex]M_1V_1=M_2V_2\\\Rightarrow M_2=\dfrac{M_1V_1}{V_2}\\\Rightarrow M_2=\dfrac{M_119}{310}\\\Rightarrow M_2=M_1\times\dfrac{19}{310}\\\Rightarrow M_2=0.613M_1[/tex]
[tex]\boldsymbol{\therefore M_2=0.613M_1}[/tex]
The concentration of the diluted solution will be 0.613 times the concentration of the stock solution.
PLEASE HELP!!! A dive tank at 3000 psi has a temperature of 30° C on the boat. What would the pressure be when diving in 14° C water? Assume the volume and number of particles stayed the same.
The pressure would be 2841.59 psi
Further explanationGay Lussac's Law
When the volume is not changed, the gas pressure in the tube is proportional to its absolute temperature
[tex]\tt \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}[/tex]
P₁=3000 psi
T₁ = 30+273=303 K
T₂=14+273=287 K
[tex]\tt P_2=\dfrac{P_1.T_2}{T_1}\\\\P_2=\dfrac{3000\times 287}{303}\\\\P_2=2841.59~psi[/tex]
Which energy transformation occurs in an
electric motor?
Answer:
Electrical energy to mechanical energy
Explanation:
In an electric motor, the energy transformation that is involve is a move from from electrical energy to mechanical energy.
For every system, according to the law of conservation of energy "energy is neither created nor destroyed but transformed from one form to another".
An electric motor converts electrical energy to mechanical energyThe electrical energy passes through and electromagnet set up. This then cause the motion to rotate. Therefore, electrical energy is transformed to mechanical energy.Label each of the following properties of sulfur as either á physical or chemical property.
Use the definition of a physical property and chemical property to back up your answer.
1. It reacts with hydrogen when heated
2. It is a yellow solid at room temperature
3. It is soluble in carbon disulfide
4. Its density is 2.97 g/cm3
5. It melts at 113°C
Answer:
Explanation:
1. It reacts with hydrogen when heated
Chemical property
2. It is a yellow solid at room temperature
Physical property
3. It is soluble in carbon disulfide
Chemical property
4. Its density is 2.97 g/cm3
Physical property
5. It melts at 113°C
Physical property
Physical properties tells us everything about what substance is when no change is occurring to its constituents.
It can be observed using apparatus and instruments. Examples are state of matter, color, odor, taste, texture, hardness, solubility in water, density, melting point and boiling point
Chemical properties are those properties that tell us about what a substance can do as regards to whether or not the substance reacts with other substances. Examples are flammability, rusting of irons, precipitation, decomposition of water by an electric current.
The leading couse of air pollution is
Answer:
Wildfires
Explanation:
Why did we use phenolphthalein and bromothymol blue in this experiment? What
do each of the colors indicate? What results would you expect for each of the
parts? Justify your answer using CO₂ and its effect on the indicators.
Phenolphthalein is a drab, vulnerable acid that is appreciably used as a hallmark in titration experiments to suggest the endpoint of the titration. The endpoint is indicated with the useful resource of the formation of red color on the grounds that this compound dissociates to shape crimson anions at the same time as dissolved in water.
Titration of an antacid consists of a strong acid-susceptible base titration whose pH at the endpoint is plenty much less than seven. therefore, bromophenol blue rather than phenolphthalein is used as a trademark because the pH range of bromophenol blue is a whole lot less than seven. The pH range of phenolphthalein lies above seven.
The use of CO₂ and its impact on the signs, Phenolphthalein is often used as a hallmark in acid-base titrations. Phenolphthalein is often used as an indicator in acid-base titrations. For this utility, it turns colorless in acidic answers and crimson in simple solutions. It belongs to the elegance of dyes referred to as phthalein dyes.
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Order the units or geologic time from the longest to the shortest era, period, epoch, eon.
Answer:
The geological time from the longest to the shortest are:
Eon,Era,Period and,Epoch.What type of friction is eating?
a. static
b. fluid
c. rolling
d. sliding
Answer:
The answer is C. rolling
Explanation:
I know this bc its the only reasonable answer since friction occurs when dealing with with solids and what is food? a solid
lol jp i dont know if this is right.
Which mineral will scratch glass?
Answer:
Quartz
Explanation:
thw table below provides data the length of day for different planets in the solar system
The day length of each planet corresponds to the amount of time it takes to complete which type of motion?
a one rotation of the planet on its as
b one reversal of magnetic poles of the planet
c one revolution of the planet around the Sun
d one orbit of the largest moon of the planet
Answer:
a one rotation of the planet on its axis
Explanation:
The two types of motion that planets undergo are;
1) rotation of the planet about its axis
2) revolution of the planet around the sun.
In every planet there are days as shown in the image attached to the question. However, the length of day in each planet is determined by the time required for the planet to complete one rotation on its axis.
It takes the earth 1 earth day (24 hours) to complete rotation on its axis.
which animal can be both primary and secondary consumers
Homo Sapiens themselves are the primary consumers as they feed on fruits, vegetables, etc.
Also, they are the secondary consumers as they feed on other organisms too like pigs, chickens, etc.
An 85.0 kg patient being treated for a serious infection is to receive an iv infusion of 1 /mg kg gentamicin, a powerful antibiotic. the pharmacy has prepared a 250. ml iv bag of normal saline in which 0.500 g of gentamicin has been dissolved. what is the total volume of the iv solution that should be given to the patient? round your answer to the nearest ml
Answer: 1/ms=8mk
Explanation:
If a motorcyclist accelerates from rest to 40 m/s in 8 seconds, what is their acceleration?
A: 5m/s^2
B: -5m/s^2
C: 320 m/s^2
please answer asap, this class is hard, is it multiplication? I have no idea. (doing test corrections)
please help me with this basic organic conversion.
use the shortest way to do it
Answer:
See explanation
Explanation:
This conversion must go through a sequence of steps as i have shown in the image attached to this answer.
The acetone is converted to propan-2-ol using LiAlH4, THF and acid. The propan-2-ol may be converted to propene by E2 elimination. Addition of HBr yields 2-bromo propane.
The Wurtz reaction converts 2-bromo propane to 2,3- dimethyl butane. This can be brominated in the presence of light to yield 3-bromo-2,3-dimethyl butane. Elimination of HBr using a base leads to the formation of the required product as shown.
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When swinging on a park swing when is your kinetic energy the least?
Question 1 options:
Kinetic energy is least at the lowest point of your swing when you are closest to the ground.
Kinetic energy is the least when you are halfway between the highest point of the swing and the bottom.
Kinetic energy is least at the at the top of the swing when you are still for a moment just before falling again.
Kinetic energy is least as you are moving past the bottom of the swing and going back up to the highest point.
Question 2 (3 points)
In the EXPLORE section of your lesson 4.08 on Potential energy there were several animations to watch that provided a graphic illustrating how the PE and KE in a system changed as a skateboarder rides a halfpipe or a pendulum moves, why did the bar for the total energy remain constant?
Question 2 options:
all answers given are correct
Because these models do not take into account the impact of friction and air resistance and are helping to solidify the concept of energy conservation and that the total mechanical energy remains constant in that model.
Energy is converted from kinetic to potential and potential to kinetic, but the total amount of energy is conserved.
This is because no energy is being created or destroyed in this system
Question 3 (3 points)
Studying energy involves determining the amount of energy an object has. This energy can be kinetic or potential, or it could be a combination of both. Consider a 2-kg bowling ball sits on top of a building that is 40 meters tall. It falls toward the ground. Think about the amount of kinetic energy the bowling ball has as it falls, select when the ball would have the most kinetic energy from the choices given.
Question 3 options:
after it hits the ground and is no longer moving.
as it sits on top of a building that is 40 meters tall.
as it is halfway through the fall and it has reached a speed of 19.8 meters per second.
just before it is to hit the ground and it has reached a speed of 28 meters per second.
Question 4 (3 points)
How can you increase the gravitational potential energy (GPE) of an empty shoe box on the middle shelf of a bookcase?
Question 4 options:
raise the box to a higher shelf
add items to the box and raise it to a higher shelf
all of the options listed here will increase the GPE
add items to the box to increase its mass on the self it is on
Question 5 (3 points)
Which is an example of an object increasing its kinetic energy
Question 5 options:
an airplane after parking at the gate on the airport runway
a rocket resting in the docking claps just before the launch sequence it to begin
a jogger running faster after spotting a mountain lion following him on the trial
a train that is no longer moving and has come to a complete stop at the station platform so people can board
Question 6 (3 points)
Changing which factor would NOT influence the total kinetic energy of a moving shopping cart?
Question 6 options:
Decreasing the mass or the speed of the cart
increasing the rate of speed you push it down the aisle
increasing the mass of the cart by adding items while moving
Turning a different direction at the end of the aisle while continuing to move at the same speed.
Question 7 (3 points)
Mechanical energy is defined as
Question 7 options:
potential energy
Energy of machines and tools
the energy of motion and position, which is represented by the formula KE + PE = ME
Energy of motion
Question 8 (3 points)
Two children are waiting to go down a slide. The first child goes down and then stays sitting at the bottom of the slide. If there is no friction involved and all of the mechanical energy is conserved what would happen to the energy of the second child from the top to the bottom of the slide?
Question 8 options:
All energy stays the same, it does not change
The energy is destroyed
Kinetic energy would turn in to Potential energy at the bottom
Potential energy from the top of the slide would turn to Kinetic energy as they slide down, in turn the kinetic energy of the child coming down the slide will be given to the child sitting at the bottom when they collide.
Question 9 (3 points)
Conservation of mechanical energy is defined as
Question 9 options:
Energy of motion
Potential energy added to kinetic energy
Law of conservation of energy
The sum of the kinetic and potential energies of an object remains a constant value unless there are forces acting on the object that cause a loss of energy overall, such as friction and air resistance
Question 10 (3 points)
Which is an example of gravitational potential energy only.
Question 10 options:
a puppy walking around under a tree
an apple resting on the teacher’s desk
a rolling skateboard going down a hill
an elevator moving up to the 3rd floor
Answer:
kinetic energy is least at the top of the swing when u are still for a moment just before falling down because kinetic energy was converted to potential energy ND the total amount of energy was conserved just before it hit the ground and reach a speed of 28m/sall the options can increase the gravitational potential energy a jogger running faster after spotting a mountain lion following him on the trial turning a different direction at the end of the aisle while continuing to move at the same speed kinetic energy will turn to potential energy at the bottom potential energy from the top slide will turn tokinetic energy as they slide down, in turn the kinetic energy of the child coming down to the slide will be giving to the child sitting at the bottom when they collidepotential energy added to kinetic energy an Apple resting on the teacher's deskFacts about Mars
Named after the Roman God of war, Mars is the fourth planet from the sun in our solar system.
Mars is also known as the 'Red Planet' because, well, it's red! ...
Mars is the second smallest planet in the solar system after Mercury.
Answer:
I don't get the question? what am I supposed to be answering? these facts are all true if that's what you're looking for.
Answer:
Thanks
Explanation:
Who is the kingdom of plants?
Answer:
i think you mean what is the kingdom of plants, but its "Kingdom Plantae".
Kingdom Plantae traits: eukaryotic/have nucleus, multicellular and autotrophic. (they photosynthesis)
2nd largest kingdom
Answer:
Introduction: All the plants are placed in the Kingdom- Plantae, according to the five-kingdom classification by R.H. Whittaker. The Kingdom- Plantae consists of multicellular plants with eukaryotic organization and chlorophyllous cells.
Explanation:
What is the kingdom for plants called?
What are the 3 plant kingdoms?
Kingdom Plantae Organisms
Ferns: They fall under the division Pteridophyta and are known to have vascular tissue. ...
Mosses: They fall under the division Bryophyta and have no vascular system. ...
Cone-bearing plants: They fall under the division Spermatophyta, sub-division gymnosperms
Cl2 +
NaBr
what’s this answer?!
5.
This ancient element symbol
means ...
A. copper
B. silver
c. gold
D. tin
Answer:
A im pretty sure
Explanation:
how acetophenone can be converted to phenol by reaction?
a) m-CPBA followed by base catalysed hydrolysis
b) conc. HNO3
c) iodine and NaOH
d) Singlet oxygen followed by base catalysed hydrolysis product
Answer:
m-CPBA followed by base catalysed hydrolysis
Explanation:
The scheme of this reaction is shown in the image attached.
We can see here that the acetophenone reacts with metachloroperoxybenzoic acid (m-CPBA) as shown in the image to yield phenyl acetate.
Phenyl acetate is now hydrolysed by a base as shown to yield the acetate ion and phenol.
Which of the following describes Rutherford's model of the atom? (1 pt)
*
1 point
solid sphere like a marble but unique to the element it makes
numerous positive charges floating around in a sea of negative charge (plum pudding)
positive nucleus surrounded by a blob of negative charge
positive nucleus surrounded by electrons in circular orbits
positive nucleus surrounded by electron orbitals with complex 3-D shapes and assigned energies.
Rutherford model of the atom states that positive nucleus surrounded by a blob of negative charge.
What is Nucleus ?
The positively charged area at the centre of each atom is known as the nucleus .
It is made up of two different subatomic particle kinds that are closely clustered.
Protons, which have a positive electric charge, and neutrons, which have no electric charge, are the particles.
According to Rutherford's theory, an atom's nucleus is surrounded by electrons that are negatively charged.
He also asserted that the electrons that surround the nucleus travel in a circular pattern at extremely high speeds. He gave these elliptical routes the name orbits.
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Help a man out I just gotta pass
Answer:
D.
Explanation:
Honestly not sure just a guess
Planets that orbit farther away from the Sun than Earth have ____ years than we do.