How many moles are in 23 grams of CCl4?

meaning: oxidisation occurs when an element is oxidised or losses electrons. major example: rusting of iron.

meaning: digestion is the break down of food molecules into nutrients which the body later uses for energy, development, cell repair, etc. major part of digestion occurs in small intestine and begins from mouth.

Answer:

Oxidation releases energy from the food for us to use and occurs when an element is oxidized or loses electrons.

Digestion is the breakdown of food small enough to be absorbed by the cells. It turns the molecules into nutrients which the body later uses for energy, development, cell repair, etc. The digestion process occurs in the small intestine and begins from the mouth.

In conclusion, this shows how they are different.

Explanation:

Answer:

d. The particles of matter are arranged

in different ways for the different

states.

Explanation:

when you hear kinetic think hot or cold

example

water when its hot its a gas and looks different under a microscope

water when its cold its ice and looks different under a microscope

Answer:Individual contour lines on a topographical map are a fixed interval of elevation apart known as a contour interval. Common contour intervals are 5, 10, 20, 40, 80, or 100 feet. The actual contour interval of a map depends upon the topography being represented as well as the scale of the map.

Answer: Physical change

Explanation: Quite simple as the starfish opening a clam would mean the starfish is physically changing the clams look.

A starfish opening a clam is a chemical change because opening a clam will be done by the secretion of saliva from the starfish that will open the clam.

The term “physical change” refers to a change in an object's appearance. When there is a change in the surroundings of the object, such as a rise in temperature or pressure, a physical change takes place.

When candles are burned, the wax melts, but as soon as the temperature drops, the wax hardens and solidifies once more.

A chemical change is a change that can be done by a reaction between two substances that can come in contact. A starfish is opening a clam to eat the clam, it can be done by the mouth which secretes an enzyme that will open the clam.

Thus, a starfish opening a clam is a chemical change.

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Answer:

body

Explanation:

because if latic acid is conveted to pyruvic acid.

Answer:

methane-CH4

have a good day

The practical significance of scientists being able to estimate the products of a reaction before it is performed is to evaluate the result without performing any experiment that requires huge capital.

Being able to predict chemical reactions is an important skill for scientists which provides valuable information about the reaction such as products of the chemical reaction. This information is used to structure their presentation and results.

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Answer:

The number of grams is 434.5 g.

Explanation:

This problem is asking for the solubility of CO2 at both 25. °C and 60. °C in different masses of water and that of KNO3 in 40. g of water at 80 °C. At the end, the answers are 0.14 g, 0.348 g and 68. g respectively.

In chemistry, solubility is defined as the maximum amount of a solute one can perfectly dissolve without getting any precipitate or undissolved amount.

In this case, for CO2, one can start seeing that at 25. °C its solubility in 1000 g of water is approximately 1.4 g, which means that in 100. g it turns out to be:

[tex]\frac{1.4gCO_2*100.gH_2O}{1000gH_2O} =0.14 gCO_2[/tex]

However, at 60. °C it is approximately 0.6 g in 1000 g of water, which means that in 580. g it turns out to be:

[tex]\frac{0.6gCO_2*580.gH_2O}{1000gH_2O} =0.348gCO_2[/tex]

Finally, since the solubility of KNO3 at 80 °C is about 170 g in 100 g of water, one can see that in 40. of water it turns out to be:

[tex]\frac{170 gKNO_3*40.gH_2O}{100gH_2O} =68 gKNO_3[/tex]

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The mass of the substance is the product of the molar mass and the moles of the substance in the compound. The amount of the HF required in the reaction is 242 gm.

Mass is given as the product of the moles of the substance and of the molar mass of the substance in the compound.

Given,

Molar mass of Silicon dioxide = 60g/mol

mass of Silicon dioxide = 182 g

Molar mass of HF = 20 g/mol

Moles of the Silicon dioxide can be calculated as,

[tex]\begin{aligned}\rm Moles &= \rm \dfrac{mass}{molar\;mass}\\\\&= {182}{60}\\\\&= 3.03\end{aligned}[/tex]

The balanced chemical reaction can be shown as,

[tex]\rm SiO_{2} + 4HF \rightarrow SiF_{4} + 2H_{2}O[/tex]

From the reaction, it can deduce that,

1 mole of silicon dioxide reacts with 4 moles of HF

So, 3.03 moles of silicon dioxide reacts with 12.12 moles of HF

Mass of HF can be calculated as,

[tex]\begin{aligned}\text{mass of HF} &= \rm moles \times \rm molar \; mass\\\\&= 12.12 \times 20\\\\&= 242 \;\rm g\end{aligned}[/tex]

Therefore, the reaction requires 242 gm of HF.

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Answer:

because its getting converted into another form of energy, as the puck is falling its increasing its velocity at a rate which decreases its potential energy and increases its frictional energy which then converts to kinetic energy as it hits an object or the floor.

Explanation:

Answer:

CH4

Explanation:

this would have the lowest boiling point as it has the least amount of intermolecular forces and is the smallest molecule and would be easier to break apart rather than the higher boiling points (C4H10 etc)

hope this helps

Answer:

Aluminium Can not rust (Can't rust also meaning Corrode)

Because it's surface is protected by aluminium Oxide which stops the metal below from coming in contact with the air (which contains Oxygen) Unlike rust, which can flake off the surface of iron and steel objects, the layer of aluminium oxide does not flake off.

Corrode

destroy or damage (metal, stone, or other materials) slowly by chemical action.

Explanation:

a.) the ball comes back down because of the gravitational pull

b.)the car is non living because it runs on a engine (man made)

Answer:

On the basis of this explanation, if the rate of lactate production is high enough, the cellular proton buffering capacity can be exceeded, resulting in a decrease in cellular pH. These biochemical events have been termed lactic acidosis. ... Every time ATP is broken down to ADP and Pi, a proton is released

Explanation:

Aluminum foil on door knobs when we want to paint a door to avoid paint stains

Aluminium is an element of the periodic table with an atomic number 13.

Now, When painting alone, aluminum foil is used in wrapping doorknobs, and this practice is done to keep paint off.

The usage aluminum foil is an efficient way of keeping away paint from touching door knob

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Answer: As long as the parcel is unsaturated (relative humidity < 100% or whenever the dew point temperature of the parcel less than the temperature of the parcel ), the rate of cooling is 10°C for every 1000 meters the parcel is lifted. As a rising parcel cools, its relative humidity increases.

n = PV=RT

where

n = number of mole

p = pressure = 2.15 ATM

v = volume = 60.5L

r = 0.0821 atm (L)/ mol(K)

t = temperature = 25°+273.15=298.15 kelvin

Replacing with the values given

n = 2.15(60.5)/0.0821(298.15)=5.3 mole.

Answer:

Hydroxyl group of the carboxylic acid is destined to leave and the oxygen of the alcohol moiety stays with its hydrogen destined to leave.

Hope this helps, please let me know if I'm wrong.

I think zinc is not used into inverstiagte with hydrogen gas because it is non-porous in nature which causes it to have a slow reaction

Explanation:

Because Zinc is more reactive than Hydrogen

Explanation:

2H2 + O2 = 2H2O

2mol. 1mol. 2mol

2mol reacts with 1mol

13mol reacts with x

x=13mol × 1mol

2mol

x= 13mol

2mol

x= 6.5mol of oxygen

After understanding the food chain, we realize that how one organism is dependent upon another organism for survival. Here among the given organisms, seagulls receives the energy last. The correct option is D.

A food chain refers to the order of events in an ecosystem, where one living organism eats another organism, and later that organism is consumed by another larger organism. The flow of nutrients and energy from one organism to another occurs at different trophic levels.

The food chain consists of sequential stages which are called the trophic levels. A food chain starts with the producers which utilize large amount of energy from the sun and the decomposers which are the last part needs less energy.

Decomposers get energy from dead materials. Here Seagulls comes last, so it receives less amount of energy.

Thus the correct option is D.

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No, matter never disappears as it follows the law of conservation and matter changes it form from one shape to another.

Matter is something which has both mass and shape  . There are generally considered three states of matter which are solid , gas and liquid . The matter is consists of small particles known as atoms  .

Matter can never disappear as it follows the law of conservation in which the chemical and physical alterations cause the matter to change in any other form but it is conserved which states that before and after the change has occurred the quantity of matter is always exactly the same .

Variations in temperature or pressure can cause all three forms of matter to change into one another as matter can change its shape .

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Answer:

120

Explanation:

atomic number of Mercury is 80; therefore, each atom has 80 each of protons and electrons. The number of neutrons depends on the isotope, but for Hg-200, the number of neutrons is 200 - 80 = 120.

Answer:

First determine the lever arm and then multiply it times the applied force.

The equation τ = m(r^2)α is the rotational analog of Newton's second law (F=ma)

Hope this helps.

Answer: the third one 2065

Explanation:

q= (13g)(4.18)(38)

q=2064.92 ≈ 2065