Balanced one
2C_5H_8+13O_2—»10CO_2+8H_2OMoles of Pentyne
Given mass/Molarmass34/680.5molMoles of H_2O
8/2(0.5)4(0.5)2mol1mol releases 241.8KJ
2mol releases 241.8(2)=483.6KJ
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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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.
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answer
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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0.006kg ball is moving 5.0m/s How large is the kinetic energy from this motion?
Answer: times it by 5
Explanation:
Balanced chemical equation for the combustion of biodiesel
Answer:
carbon dioxide + water+ energy+ soot+carbon monoxide
Key Concepts
Identify the choice that best completes the statement or answers the question.
13. Basalt is a gray or black igneous rock. Pilar uses an absolute dating method to study a sample of basalt. What will the method help her learn about the basalt sample?
F the age of the sample
G the composition of the sample
H the physical structure of the sample
I the geographic distribution of the sample
Answer:
Explanation:
Answer
It tells you what method she used and what she wanted to accomplish. She is using
an absolute dating method to study a sample of basalt
So the answer you should post is F. F and the quotation above say the same thing.
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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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:
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.
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
B. which of the reef organisms are consumers?
Answer: The primary consumers are zooplankton, corals, sponges, Atlantic blue tang, and queen conch.
Explanation:
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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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.
How many grams of C8H18
is in 405,576.398 mL
[tex]Molarity X \frac{0.762 mol}{05.576398 L} = Mass[/tex] is the of [tex]C_8H_1_8[/tex] is in 405,576.398 mL.
What is molarity?Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Molarity is also known as the molar concentration of a solution.
Given data:
Molar mass of [tex]C_8H_1_8[/tex] = 0.762 mol
Volume of solution = 405,576.398 mL = 405,576.398 mL/1000 = 405.576398 L
Solution:
Step 1: Calculating moles of [tex]C_8H_1_8[/tex]
• Molarity =[tex]\frac{\;Moles \;of \;solute}{\;Volume \;of \;solution \;in \;litre}[/tex]
• Putting the value in the given formula
• Moles of solute C8H18 = [tex]\frac{\;Mass}{\;Molar \;molar \;mass}[/tex]
• Moles of solute C8H18 = [tex]\frac{\;Mass}{0.762 mol}[/tex]
Now,
Molarity =[tex]\frac{\;Moles \;of \;solute}{\;Volume \;of \;solution \;in \;litre}[/tex]
Molarity =[tex]\frac{\frac{\;Mass}{0.762 mol}}{\;Volume \;of \;solution \;in \;litre}[/tex]
Molarity =[tex]\frac{\frac{\;Mass}{0.762 mol}}{405.576398 L}[/tex]
[tex]Molarity X \frac{0.762 mol}{05.576398 L} = Mass[/tex]
Hence, [tex]Molarity X \frac{0.762 mol}{05.576398 L} = Mass[/tex] is the of [tex]C_8H_1_8[/tex] is in 405,576.398 mL.
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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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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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What information does the percent composition of an atom in a molecule give?
A. The total number of atoms of that element in a molecule
B. The total mass that element contributes to a molecule
C. The relative amount of mass an atom contributes to a molecule
D. The relative number of atoms one element contributes to a molecule
Answer:
C
Explanation:
The percent composition of an atom in a molecule gives information regarding the relative amount of mass an atom contributes to a molecule.
30cm3 of NaOH is neutralised by 12.3cm3 of 0.2mol/l HCI. What is the concentration of the NaOH. 0.82 mol/l 0.082 mol/l 82 mol/l 0.49 mol/l
Lets see
C1V1=C2V230C1=0.2(12.3)30C1=2.46C1=2.46/30C1=0.082mol/LAnswer:
Step 1: Calculate the amount of sodium hydroxide in moles
Amount of solute in mol = concentration in mol/dm 3 × volume in dm 3Amount of sodium hydroxide = 0.100 × 0.0250.= 0.00250 mol.The balanced equation is: NaOH(aq) + HCl(aq) → NaCl(aq) + H 2O(l)So the mole ratio NaOH:HCl is 1:1.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
nuclear reactions take place where?
a) ring of electrons, b) the entire atom, c) nucleus, d) none of these
What will most likely happen when stress is applied to an equilibrium reaction?
A) The system will not respond to the stress.
B) The system will use catalysts to change its equilibrium.
C) The equilibrium position will shift to increase the applied stress.
D) The system will change its concentration to shift to a new equilibrium position.
Answer:
option D is the correct answer of this question.
When stress is applied to an equilibrium reaction then the system will change its concentration to shift to a new equilibrium position.
So, the correct option is D.
What is equilibrium ?The stage at which the rate of formation of reaction is equal to rate of backward reaction in an reversible reaction is called equilibrium.
The reaction in such stage occur is called equilibrium reaction.
Factors affecting equilibrium reaction.There are some factors which affects the equilibrium.
Pressure : On increasing pressure of the gas present in reactant side shift the reaction to forward direction.Concentration : As concentration of the reactant increases then the reaction shifts in forward direction and as concentration of product is increases then the reaction moves in backward directionTemperatureNumber of moles.learn about equilibrium
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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]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]
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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When auger is dissolved in heated water ___ is the solvent and ___ is the solute? A heat, water b water, heat c water, sugar d sugar, water
Answer C
Explanation: the solute will be sugar and the solvent will be water :)
Give the correct name for the structure in the image.
Answer:
2,5,6-trimethyloctane
Explanation:
1) Count the number of carbons in the longest chain. If the structure contains a functional group (e.g. double bond, -OH), they have to be part of the chain that you're counting.
• The straight chain is the longest chain, and it contains 8 carbons
• Without the additional 3 methyl (-CH₃) substituents, it would be called octane (since it is an alkane)
2) Assign location numbers for the substituents, ensuring that they are the lowest possible numbers
• From left to right, we could name it as 2,5,6-trimethyloctane
• From right to left of the parent chain, it would be called 3,4,7-trimethyloctane
• Assigning from left to right gives us the lowest location numbers as the sum of the numbers is 13 instead of 14
• Remember to add 'tri' since we have 3 methyl groups
How many grams of BaCl2 are required to make 1.50L of a 0.60M solution?
Answer:
187.407g
Explanation:
Moles of solute = Molarity × Liters of solution
Multiply 0.60 M by 1.50L:
0.60 mol/ 1L×1.50L=0.9 mol
To obtain the mass of solute, we will need to the molar mass of BaCl2, which is 208.23g/mol:
Finally, multiply the number of moles by208.23g /mol
0.9mol×208.23g/1mol =187.407g
Boom, you have a mass of:
187.407g
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