Answer:
32
Explanation:
The total valence electron is available for the Silicon tetrachloride
lewis structure is 32
Electrons have a maximum capacity of 2 electrons in the lower most shell
then in the second shell it has the maximum capacity of 8. What about the third shell is it 8 or 18 (please explain with the reason)
Answer:
18
Explanation:
The third shell has maximum capacity of 18 electrons. The maximum capacity of a shell can be calculated by the formula 2n^2. Where n is shell no. such as 3
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answer
Terbium-147 undergoes positron emission to become a stable atom. what is that stable atom? a. b. c. d. e. f.
Terbium-147 undergoes positron emission to become a stable atom, the stable atom is ₆₄Gd¹⁴⁷.
What are radioactive decay series?Series (or family) of natural radioactive decay is the set of elements with unstable nuclei, which follow an orderly sequence of spontaneous decay, that is, they emit alpha and beta particles, until a stable lead nucleus is created.
In this case, natural radioactive decay occurs when the nucleus of the atom of some chemical element is unstable and then it "breaks", releasing electromagnetic radiation and disintegrating.
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Which of these metals must release the most heat to expenence a given decrease in temperature per gram of metal? Aluminum, Lead, and Iron.
Aluminium is the metal which must release the most heat to experience a given decrease in temperature per gram of metal.
What is Thermal conductivity?This is as a result of free electrons and is the ability of a substance to conduct heat.
Aluminium has the highest thermal conductivity in this case which is why it will release the most heat to experience a given decrease in temperature per gram of it.
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81. Predich Describe what might happen if you put a sealed glass container full of water into a freezer.
Answer:
When liquid water reaches the freezing point, it expands. After placing a sealed glass container full of water into the freezer, we might expect it to freeze, expand, and either crack or shatter the glass.
Explanation:
Which elements will form a cation?
Oxygen
Helium
Magnesium
Sulfur
Answer:
Magnesium
Explanation:
Magnesium is a metalMetals have tendency to give up the electrons of the outermost shell and forms cation.[tex]Mg \longrightarrow Mg^{2+} + 2e^-[/tex]Balanced chemical equation for the combustion of biodiesel
Answer:
carbon dioxide + water+ energy+ soot+carbon monoxide
B. which of the reef organisms are consumers?
Answer: The primary consumers are zooplankton, corals, sponges, Atlantic blue tang, and queen conch.
Explanation:
What is the best choice for cleaning up a water filter used in the filtration of unknown small particles from polluted stream water
Answer:
Reverse Osmosis
Explanation:
Reverse osmosis systems are able to remove more contaminants than carbon, making them a popular choice for many consumers.
What would the total surface area be if our large cube were divided into 8000 cubes with each side having a length of 1 cm?
48,000 cm2
8000 cm2
36,000 cm2
96 cm2
Answer:
48 000 cm^2
Explanation:
8000 1cm cubes
each 1 cm cube side is 1 cm^2 and there are six sides to the cube , so each cube has 6 cm^2 surface area
and there are 8000 of them 8000 * 6 cm^2 = 48 000 cm^2
A student is balancing an equation in her chemistry class. What fact is she using to check her work?
A ).The number of atoms on each side of the reaction arrow must be different.
B).The number of atoms on each side of the reaction arrow must be the same.
C).The number of molecules on each side of the reaction arrow must be the same.
D).The number of elements on each side of the reaction arrow must be the same.
3Na+3CI+AI—>3Na+3CI+AI
Answer:
The answer is B. The number of atoms on each side of the reaction arrow must be the same.
Explanation:
Check your work to make certain you have the same number and type of atoms on the reactants side as on the products side
15.a. Classify the following alkanes according to their increasing density. C₂Hs , C2H56, C11H24, C₂H6. C36H74
The order of alkanes according to their increasing density can be seen below:
C₂H5C₂H6C2H56C11H24C36H74What is Alkane?This is referred to a hydrocarbon with a single carbon to carbon bond and examples include butane etc.
Its density increases with increasing number of carbon and hydrogen atoms thereby making it the most appropriate choice.
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Where are taste buds located?
the tongue and roof of mouth
the roof of the mouth only
the roof and side of mouth
the tongue only
the tongue and roof of the mouth
would be the answer
Answer:
The tounge and roof of the mouthExplanation:
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If you have 10,000 grams of a substance that decays with a half-life of 14 days, then how much will you have after 28 days?
Round to the nearest whole number.
Answer:
2500g
Explanation:
Half-life like the name suggests cuts the amount by half. So 10,000 grams would be 5,000 grams in one half-life (14 days). But 28 days is two halflives (14 + 14 = 28), thus 5,000 would be cut in half again to finally be 2500 g.
a.
Convert these temperatures to Kelvin:
A. -22 °C
b. 206 °C
C. 50 °C
d. 8 °C
Like this
-22°C + 273.15 = 251.15K
206°C + 273.15 = 479.15K
50°C + 273.15 = 323.15K
8°C + 273.15 = 281.15K
Ethanol, an organic compound, has the following structural formula.
H
H
H-C-C-0-H
I
1
H H
What is the chemical formula for ethanol?
O CHO
O
C₂H5O
C₂H5O2
O C₂H6O
Answer:
hope this will help you
Explanation:
[tex]the \: structural \: formula \: is \: ch3 - ch2 - oh \\ \\ and \: chemical \: formula \: is \: c2h6o[/tex]
The chemical formula for ethanol is [tex]C_2H_5OH[/tex], where there are 2 carbon atoms, 6 hydrogen atoms, and 1 oxygen atom are there.
What is the chemical formula?A chemical formula tells us the number of atoms of each element in a compound.
The methyl group ([tex]CH_3-[/tex]) carbon attaches to the methylene group ([tex]CH_2-[/tex]) carbon, which binds to the oxygen of the hydroxyl group (-OH).
Hence, the chemical formula for ethanol is [tex]C_2H_5OH[/tex], where there are 2 carbon atoms, 6 hydrogen atoms, and 1 oxygen atom are there.
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Convert 4.92 L of hydrogen at STP to moles.
a 0.202 mol H2
b 0.444 mol H2
C 0.220 mol H2
d 4.55 mol H2
Answer:
c. 0.220 mol H₂
Explanation:
No. of moles
Volume present / Volume at STP4.92 L / 22.4 L0.220 mol H₂[tex]{\huge{\fcolorbox{yellow}{red}{\orange{\boxed{\boxed{\boxed{\boxed{\underbrace{\overbrace{\mathfrak{\pink{\fcolorbox{green}{blue}{Answer}}}}}}}}}}}}}[/tex]
[tex] \sf C) \: 0.220 \: mol \: H_2[/tex]
Explanation:
1 mol = 22.4 litres
4.92 = how many moles?
[tex] \sf \implies \frac{4.92}{22.4} \\ \\ \sf \implies 0.2196 \\ \\ \sf \implies 0.220 \: mol \: H_2[/tex]
Molly inflates a beach ball to a volume of 8 liters in her air-conditioned house where
the temperature is 19°C. Later that day, Molly takes the beach ball to the beach. The
temperature at the beach was 33°C, and the air pressure at the beach is the same as
it was at the house.
What will happen to Molly's beach ball when she is at the beach?
The temperature at the air-conditioned house is 19° C. The temperature increases to 33° C in the beach. Molly's beach ball's volume will increase with increase in temperature.
What is the Charles law?Charles' law states that volume of gas increase with an increase in the temperature of the gas.
When pressure remain constant, if temperature increases, the volume of the ball will also increase.
Thus, Molly's beach ball's volume will increase with increase in temperature.
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I need help I will give crown
Answer:
This is a scientific model.
Explanation:
A scientific model is a representation of systems of ideas, events or processes.
This drawing offers explanations that enables the water cycle to be predicted.
Use the drop-down menus to classify each of the following compounds.
HR: H
HH
H-C-C-O-C-C-H
H-C-C-
-C-C-H
A
H
RETRY
>
-H
>
HH Br
H-C-C-C-H
Answer:
ester, ether, haloalkane
Explanation:
EDG.2022
When the fish water had pH of 8.0, the hydronium ion concentration is 1.0x 10^-8 mole per liter. What is Hydornium ion con ent ration when water had pH of 7.0
The hydronium ion concentration when pH = 7 is : 8.75 * 10⁻⁹ mole/liter
Determine hydronium ion concentration when pH = 7
Given that :
pH = 8.0
Hydronium ion concentration = 1 * 10⁻⁸ mole/liter
Resolving the question
8.0 = 1 * 10⁻⁸ mole/liter
7.0 = x
therefore :
x = 7 ( 1 * 10⁻⁸ ) / 8.0
= 8.75 * 10⁻⁹ mole/liter
Hence we can conclude that The hydronium ion concentration when pH = 7 is : 8.75 * 10⁻⁹ mole/liter
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How much sample will remain after 40 days for as 200 g sample of Radon-222? The half-life of Radon-222 is 4 days.
Answer:
[tex]\boxed{N_t =0.1953125 \: grams}[/tex]
Explanation:
Formula:
[tex]N_t = N_0( { \frac{1}{2} })^{ \frac{t}{t_ \frac{1}{2} } } [/tex]
Where Nt is the amount of substance remaining after time t,
N0 is the amount of substance at time t = 0,
t is the time at which we have to find out how much substance disintegrated from t = 0 to t = t
& t_1/2 is the half life corresponding radioactive sample.
Given:
N0 = 200g
t= 40 days
t1/2 = 4 days
To find:
Nt =?
Solution:
Substituting given data in above formula,
[tex]N_t = N_0( { \frac{1}{2} })^{ \frac{t}{t_ \frac{1}{2} } } \\ N_t = 200( { \frac{1}{2} })^{ \frac{40}{4 } } \\ N_t = 200 \times 0.0009765625 \\ \boxed{N_t =0.1953125 \: grams} [/tex]
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Name these compounds according to IUPAC.
IUPAC is the universal nomenclature method that is used to give the names of the chemical compounds. The compounds are ethene, propionaldehyde, and propanone.
What are functional groups?Functional groups are the particular side groups that are added to the main chain to exhibit a specific property and character to the atom. In the first compound, the presence of the double bond makes it alkene, and the two carbons make the compound ethene.
The second compound has an aldehydic group with suffix -al and three carbon making it propanal, similarly, the third compound is propanone as it has ketone as the functional group and three carbon atoms in the chain.
Therefore, the compounds are ethene, propanal, and propanone.
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What is the mass of one mole of product? (Remember the law of conservation of mass)
Answer:
To calculate the no. of moles you must know mass and molar mass of the product
Explanation:
# of moles = mass/molar mass
Weather is influenced by global patterns of atmospheric movement. Winds and
ocean currents are evidence for the process of
Winds and ocean currents are evidence for the process of regulating and stabilizing the climate patterns.
What are winds and ocean currents?Ocean current is the flow or movement of water in a direction by gravity, wind, and difference in density of the water.
Wind currents pull water and create ocean currents. The current flow to westwards, which is called Coriolis effect.
Thus, Winds and ocean currents are evidence for the process of regulating and stabilizing the climate patterns.
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Name these compounds according to IUPAC.
Answer:
10. Butanoic acid
11. Methylpropanoate
Explanation:
In this case first you need to identify the functional group,secondly identify the longest chain that contains the particular functional group:
10. The functional group for this compound is a carboxylic acid due to the "CHO2" group..we have four carbons which makes the parent chain to be butane.since it's acarboxylic acid we replace the "e" at the end to "oic acid".
11. The functional group is ester "RCOOR".For the ester the longest chain is counted from the part of the carboxylic acid which in this case is a propane,and the part from the alcohol becomes a substituent. With esters you replace the "e" at the end of the parent name to "oate". When you write it down you begin with the substituent in this case "methyl" and the rest follows...
hope it is clear enough
0.006kg ball is moving 5.0m/s How large is the kinetic energy from this motion?
Answer: times it by 5
Explanation:
Put the following events in the order for a digital recording to become sound waves through a speaker. put the first event at the top of your list.
The events in the order of top to bottom for a digital recording to become sound waves through a speaker include:
Sound is encoded on a digital recording as an electrical signal.The digital recording plays the sound as an electrical signal.The electric signal moves through a voice coil.The voice coil produces a magnetic field.Changing the magnetic field pushes and pulls on the diaphragm.What is Sound wave?This is defined as a pattern of disturbance caused by movement of energy along a medium.
The order of events which produces the sound heard by audience can be seen above.
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Acids are released and food is mixed and mashed into a soupy sludge in the ___________.
Answer: Is it multiple choice? The answer should be stomach.
Explanation:
Answer:
Blank = Stomach
The stomach mixes food with acids to create chyme, a, "soup" that helps digestive enzymes complete their work.
Name two other substances with giant covalent substances
Answer:
diamond, graphite (types of carbon) and silicon dioxide (silica).
Explanation:
Substances with giant covalent structures are solids with very high melting points. All the atoms are linked by strong covalent bonds, which must be broken to melt the substance.