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.
What is the relation of the mass and moles?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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1. How many grams of CO2 will dissolve in 100. g water at 25.°C?
2. How many grams of CO2 will dissolve in 580. g water at 60.°C?
3. How many grams of KNO3 will dissolve in 40. grams water at 80.°C?
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.
SolubilityIn 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 number of protons In 200 80hg
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.
A starfish opening a clam is physical change or chemical change?
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.
What are physical and chemical changes?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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Explain the difference between oxidation and digestion
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:
A fixed mass of gass occupies a volume of 200cm at 21°c calculate it's volume at standard temperature
aluminium can not rust why .
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.
A car begins at rest and rolls down a hill and reaches a velocity of 95 m/s after 10 seconds. What is the car's acceleration?
Answer:
The car has an acceleration of 9.5m/s²
Explanation:
Since:
a= change in velocity / change in time
a= 95m/s / 10s = 9.5 m/s²
What determines how much an air parcel will cool?
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.
Why put aluminum foil on door knobs when you are alone.
Aluminum foil on door knobs when we want to paint a door to avoid paint stains
Aluminum foil UsageAluminium 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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Which property is the basis of the purification technique recrystallization?.
How many grams of solid calcium hydroxide are in 250mL of a 1. 5M solution
Which evidence cannot be found in spoiled foods?
a. production of gas
b. change of color
c. change of state
d. precipitate found
Answer:
a. Change of state
Explanation:
Because you will see that the state has changed
How many grams are there in 3.3 x 1023 molecules of N2I6?
Answer:
The number of grams is 434.5 g.
Explanation:
What kind of animal is more likely to have taste buds for umami flavors, a carnivore or an herbivore? Explain.
A. A carnivore is more likely to have taste buds for umami flavors because herbivores do not have taste buds. Herbivores rely on their sense of smell which their brains interpret as taste and smell at once.
B. A carnivore is more likely to have taste buds for umami flavors so it can taste the flavors of meat, while a herbivore is less likely because plants do not generally have umami flavors.
C. An herbivore is more likely to have taste buds for umami flavors so it can taste the flavors of plants, while a carnivore is less likely because meats do not generally have umami flavors.
D. An herbivore is more likely to have taste buds for umami flavors because carnivores do not have taste buds. Carnivores rely on their sense of smell which their brains interpret as taste and smell at once.
it is c because canivores eat only meat while herbivores eat only plants so it is most likely a herbivore because it knows flavours that are good for it
A carnivore is more likely to have taste buds for umami flavors so it can taste the flavors of meat, while a herbivore is less likely because plants do not generally have umami flavors. Hence, option B is correct.
What is umami flavor ?One of the five fundamental flavors is umami. It has been characterized as savory and is present in cooked meats and broths. Glutamates and nucleotides, which are plentiful in meat broths and fermented foods, trigger the taste receptors that allow us to detect umami.
Meats, shellfish, fish (including fish sauce and preserved fish like maldive fish, Katsuobushi, sardines, and anchovies), tomatoes, mushrooms, hydrolyzed vegetable protein, meat extract, yeast extract, and cheeses are examples of foods with a strong umami flavor.
Carnivores are eating meat while herbivores are plant eaters. Hence, slight chance for herbivores to taste the umami flavor. Therefore, option B is correct.
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Explain the practical significance of scientists being able to estimate the products of a reaction before it is performed.
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.
Significance of estimation of productsBeing 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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hich statement
is true?
Select one:
a. Matter consists of only large
molecules.
b. Matter is made up of only charged
particles.
c. The particles of matter have zero
kinetic energy and potential energy.
d. The particles of matter are arranged
in different ways for the different
states.
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
What amount of moles does 60.5 L of carbon dioxide occupy at 50.5 kPa and 20 degrees C?
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.
After anaerobic exercise, lactic acid is converted to pyruvic acid, which enters the ____________ pathway and can be used for energy
Answer:
body
Explanation:
because if latic acid is conveted to pyruvic acid.
What is in lactic acid that it can lower pH levels?.
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:
Given the equation: 2H2 + O2 → 2H2O, how many moles of oxygen are needed to react with 13 moles of 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
The diagram shows a food chain found in an ocean ecosystem.
Algae
Minnows
Crabs
Seagulls
Which part of the food chain receives energy last?
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.
What is a food chain?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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What is the counter interval and the relief of this topographic map
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.
A sample of oxygen at 40.°C occupies 820. mL. If this sample later occupies 1250 mL at 60.°C
and 1.40 atm, what was its original pressure?
[tex]\tt \dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]
T₁=40+273=313
T₂=60+273=333
P₁.820/313 = 1.4.1250/333
P₁=2.006 atm
What is the leaving group when converting a carboxylic acid to an ester?.
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.
Write and balance the equation for the complete combustion of ethane, c2h6. Phase symbols and energy changes are optional.
[tex]2C_2H_6 + 7O_2[/tex] → [tex]4CO_2 + 6H_2O[/tex] is the balanced equation for the complete combustion of ethane.
What is a balanced chemical equation?The chemical equation in which the number of atoms of each element is equal in the reactant and the product of the reaction is called a balanced chemical equation.
[tex]2C_2H_6 + 7O_2[/tex] → [tex]4CO_2 + 6H_2O[/tex] is the balanced equation for the complete combustion of ethane.
Reactants contain 4 carbon atoms, 12 hydrogen atoms and 14 oxygen atoms. The same is true for products too.
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The equation for the combustion of ethane is 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O .
What is Combustion Reaction ?Combustion, or burning, is a high-temperature exothermic redox chemical reaction between a fuel and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke.
Balanced equation for the combustion of ethane :
2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O .
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A dog has a total of 78 chromosomes. Through the process of meiosis, new cells are
created. How many chromosomes would the parents' cells have?
[tex] \qquad \qquad \huge \sf question[/tex]
Name the compound in attachment !
I have tried it myself and I think I'm correct, but my friend doesn't agree with that.
please help ~
[ Chapter : Nomenclature - Organic Chemistry ]
The IUPAC name of the given compound is 4-methylene-1,7-heptadiene
What is organic chemistry?Organic chemistry is the chemistry of carbon together with other elements such as oxygen, nitrogen, sulfur, hydrogen and phosphorus.
Organic compounds forms the core of organic chemistry.
In naming organic compounds, the IUPAC nomenclature is used.
The IUPAC name of the given compound is 4-methylene-1,7-heptadiene.
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why is zinc oxide not used to investigate this property of hydrogen gas
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
Give reasons for the following the given statements:
a) If you throw a ball upwards, it comes down.
b) Cars will move but it is not living things.
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)
Why can't we make matter disappear?
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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