How much energy is required to completely melt a 250 gram ice cube that is already at 0 degrees Celsius? Show your work & units. Expected Answer = 83,500 J

Answer:

chlorine and hydrogen atoms form a single covalent bond. in hydrogen chloride gas because the electrons are shared, not transferred from one atom to another.

Answer:

False!

Explanation:

Energy can only be transformed, changed from one form to another. List 6 forms of energy related to changes in matter.

Is this helpful? :D

Answer:

False

Explanation:

All forms of energy can cause change to occur.

Answer:

Your answer to your current question is D.20!

Explanation:

If the ball is rolling down from a ramp, it should start at the top, which is 20, then it rolls down to the bottom. But since the ball starts from the top, 20 is the speed since that number is at the top as well, showing what the speed measurement is.

Hope this helped and have a good day! :D

Answer:

b, pure.

Explanation:

an element is a pure substance and it cannot be broken down hope this helped :)

Answer:

An element is a pure substance made up of identical atoms.

Explanation:

hope it helps

and brainliest if helped......

make me brainliest

Explanation:

The observations are as follows:  Initially with the plates in the dark, no electrons pass between the plates and no current flows.   As we shine light on the plates, going from low energy red to high energy blue, suddenly current begins to flow.  How?

Einstein explained the result be describing the light waves as packets of energy.  He called the packets of energy photons.  Each photon has a specific energy, the shorter the wavelength, the higher the energy.  When a high-energy photon hits the plate (such as a green or blue), the photon has enough energy to knock out an electron and then the electron, being negative, will fly to the positive side.  At this point, current flows.

The lower energy photons are unable to know out the electrons and no energy can flow.

The exciting thing to note is the treatment of energy as a particle or a packet, it is consistent with the fact energies are not additive.  If we can bump electrons with light at 600 tera-hertz , we can�t just use 300 tera-hertz for twice the time and still expect to bump electrons.

What if the photon has greater than the threshold energy required to pop out an electron?  The extra energy just goes into the kinetic energy of the electron.  This relationship can be described by the following equation.

hf = w + KE

where hf is the energy of the photon.

w is the energy required to bump an electron.

KE is the kinetic energy of the electron.

If the photon has less energy than w, no electron is emitted.

Answer:

Like magnetic poles repel each other

Explanation:

Among the following statements, the one that is true is Like magnetic poles repel each other.

Magnets are substances which possess their own magnetic field this magnetic field basically arises from the circular movement of negatively charge electrons. The elements which have unpaired electrons and have spin angular momentum or orbital angular momentum or they are together present are called as Magnets.

The magnetic field present is invisible but it is definitely responsible for the most notable property of a magnet. Magnetic force is a force that pulls on other ferromagnetic materials, such as iron, steel, nickel, cobalt, etc. and attracts or repels other magnets.

Therefore, Among the following statements, the one that is true is Like magnetic poles repel each other.

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Answer:

Mass

Explanation:

Answer:

There is solid proof that global warming is increasing and getting worse by t he day. The ice caps slowly melt more and more each year due to this which is a proven fact. On top of that, it has been proven that carbon emission by humans is bad for the environment and it helps increase the problem of global warming by weakening our atmosphere. As for the cold days, just because we have global warming doesn't mean the earth weather wont be cold. global warming is something that slowly happens and over time the temperature global has actually been increasing at a not very notice able pace.

Explanation:

Yes, climate is changing because of the human activities which are causing harm to the environment causing global warming.

Global warming is the long-term warming of Earth's climate system that has been seen from the pre-industrial period (between 1850 and 1900) as a result of human activity, principally fossil fuel combustion, which raises heat-trapping greenhouse gas levels in the atmosphere.

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Answer:

The total amount of carbon in the world is not changing. Because matter is

conserved in all processes and reactions, carbon must decrease in one place if it increases in another.

Explanation:

hope this helped!

Answer:

A force of attraction between things that have mass. Gravity can act between objects that are not even touching. In fact, gravity can act over very long distances. However, the farther two objects are from each other, the weaker is the force of gravity between them.

Answer:

I'm pretty sure the answer would be B

Explanation:

A few months ago I had an obsession with this volcano book but it sounds the most accurate I mean everything else on there would cause stuff but earthquakes cause so much damage to the earth.

Answer:  A is your answer

Explanation:

Answer:

Explanation:

H3PO4.

Answer:

I'm pretty sure it's H3PO4

Answer:

The answer is Nitrogen has a larger radius and one less proton than oxygen.

Explanation:

Nitrogen is a gas and gas expands to fill up an area so oxygen would be pushed out and the Nitrogen would take over.

Answer:

The answer is Nitrogen has a larger radius and one less proton than oxygen.

Answer:

Water moves through the help of living organisms in an ecosystem. ... Plants absorbs water through their root system and loss by transpiration. Water also moves through the living organisms in an ecosystem. Other nonliving processes such as evaporation, precipitation, water returns back into the atmosphere.

Explanation:

hope this helps you

evaporation!

Explanation: i know im late but i hope this helps other people aswell! <3

Answer:

ok :)

Explanation: genetically modified organisms (GMOs) are being made by inserting a gene from an external source such as viruses, bacteria, animals or plants (etc) into foods. Genetically modified foods seem to be not as healthy as unmodified foods, according to research. also many people are against it due to the fact that some people go overboard and add too many genetically modified organisms, which causes health risks and unfortunately harms people. sometimes genetically modified food contains toxins and antibiotics. srry i couldnt find much on the process but this is based off my background knowledge so yeah

Answer:

There is no change in the angle at which sunlight strikes the ground. When the inclinatio n angle is 23 degrees, the longest sunlit period is about 15 hours, and the shortest is about 9 hours.

Explanation:

Answer:

a compound of the elements hydrogen, carbon, and oxygen. (also carbonic acid is a compound not a mixture ^-^)

Explanation:

hope this helps dude

According to the concept of solubility, carbonic acid is a mixture of water and carbon dioxide.

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.

A mixture of water and carbon dioxide under high temperature and pressure forms carbonic acid as it is highly soluble,thus carbonic acid is a mixture of water and carbon dioxide.

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Answer:

grass

Explanation:

it is a plant, hope this helps

Answer:

Only I

Explanation:

rabbits and foxes are not plants so it does not go through photosynthesis (they eat food to get their energy instead) . A mushroom is a decomomposer that breaks things down to get it's energy thus make the grass the only plant that goes through photosynthesis.

1. Manipulated: Water

Responding: Growth Height

2. Manipulated: Chocolate Given

Responding: Amount of Homework

3. Manipulated: Trees with Leaves

Responding: Number of Bird Nests

4. Manipulated: Acid Rain

Responding: Fish Population

5. Manipulated: Calcium Given

Responding:  Bone Strength

Think about the manipulated variable as the changing item in the experiment. If this changes, the response will. (This is the Independent Variable)

Think of the Responding Variable as the result of the variable only can change when Manipulated is changed. (This is the Dependent Variable)

Hope This Helps :)

Manipulated variable in each case are watering of plants, number of chocolates, trees having leaves,water in acid rain, amount of calcium respectively and responding variables are growth  height, amount of homework,number of bird nests,fish population,bone strength.

Variables are defined as any characteristics, number or quantity which can be measured . It can also be called as a data item . It is called as variable because they can vary and can have variety of values.

There are three types of variables 1) manipulated variable where in a condition is specified, 2) responding variable which is dependent on manipulated variable 3)controlled variable  which do not change

Example of manipulated variables are number of hours spent by a student studying , that of responding variable is result of a student and temperature is an example of controlled variable.

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Answer:

D

Explanation:

because it is changing to its own compound of chemicals.

Answer:

copper

Explanation:

because copper melts at 1,083

gold at 1 064

mercury at - 38

Answer:D

Explanation:

Answer:

here the answer would be D

Explanation:

if the two substances together have a different weight then the substance split but added together then this suggest that a new substance with a whole new mass was formed.

Answer:

A. Each organelle carries out only one role in the life functions of the cell.

Explanation:

Answer:

D

Explanation:

I'm on the same question and my teacher said I was right if I'm wrong I do apologies

Answer:

A

Explanation:

Answer:

Explanation:

It can be several answers as long as you verify your point on why.

Newton's Law of action-reaction says that 'For every action, there is an equal and opposite reaction.'

A: the toy car will be rolling down the ramp, there will be friction and kinetic energy.

C: A toy boat  The toy boat pushes against the water (action force), the water pushes back on the boat (reaction force) and pushes it forward.

Sorry if i'm wrong

Answer:

straight line down then left and right that should be it

Explanation: