Moles of Carbon dioxide(CO2) = 2
Further explanationGiven
Reaction
2 C2H6 (g) + 7 O2 (g) —+ 4CO2 (g) + 6 H20 (g)
Required
moles of carbon dioxide
Solution
The reaction coefficient shows the mole ratio of the compounds in the reaction equation (reactants and products)
From the equation, mol ratio of C2H6 : CO2 = 2 : 4, so mol CO2 :
mol CO2 = (4/2) x mol C2H6
mol CO2 = 2 x 1
mol CO2 = 2
The portion of Earth underneath the crust containing the asthenosphere and the mesosphere is the
Answer:
lithosphere
Explanation:
Answer:
mantle
Explanation:
1. Which piece of laboratory glassware is used to make precise
concentrations of solutions?
A. volumetric flask
B. beaker
C. buret
D. test tubes
Answer: I beleive it is the volumetric flask.
Explanation:
I searched it up.
Cancer cells grow so rapidly thatthey have a higher rate of anaerobic metabolism than most body tissues, especially at the center of a tumor. Can you use drugs thatpoison the enzymes of anaerobic metabolism in the treatment ofcancer? Why, or why not?
Answer:
No, you cannot
Explanation:
One of the major properties a cancer drug must have is that, it must be highly specific. If a drug that poisons enzymes of anaerobic metabolism is used on a cancer patient, it should be noted that the drug will not only kill cancer cells but will also kill under cells that make use of anaerobic metabolism. Hence, this drug is not a specific to cancer cells but will also affect other normal cells in the patient's body. Thus, it would be wrong to use such drugs to treat cancer.
what does a negative cell voltage mean?
A. the reaction releases energy
B. the reaction is non-spontaneous
C. the reaction can never happen
D. the reaction is spontaneous
Answer:
I think its B but i may be wrong
Explanation:
Sorry if im wrong!! Took that test but i dont rm the answer well enough to be for sure
The reaction is non-spontaneous
this is the correct answer
Calculate poH if given pH of 9.3
14
4.7
5.01 x 10^-6
Answer: Option (b) is the correct answer.
Explanation:
It is known that,
pH + pOH = 14
So, pOH = 14 - pH
As the given pH is 9.3. Hence, pOH for the given solution will be calculated as follows.
pOH = 14 - 9.3
= 4.7
Therefore, pOH of the given solution is 4.7.
what do you mean by sI unit
I have a brick, dimensions 4 cm tall, 9 cm wide, and 25 cm long, with a mass of 1250 g. What is the density?
Answer:
1.389
Explanation:
P = m / V
m = 1250
V = 4x9x25 = 900
1250/900 = 1.388889
How many kilocalories of heat are released when 75 g of steam at 100 degrees Celsius is converted to ice at 0 degrees Celsius?
Answer:
∴ Q = -7.52kCal
Explanation:
Using the formula for specific heat capacity:
Q = mcΔT
where ΔT = change in temperature (final - initial) = (0 - 100)°C = -100°C
m = mass (g) = 75g
c = specific heat capacity = 4.2 J/g°C in water
⇒ Q = 75 × 4.2 × -100
= -31,500J
But 1J - 0.000239kCal
∴ Q = -7.52kCal
Let me know if I can be of further assistance.
Balance the chemical equation below using the smallest possible whole number stoichiometric coefficients.
P4(s)+NaOH(aq)+H2O(l)➪
PH3(g)+Na2HPO3(aq)
A chemical equation is said to be balanced if the quantity of each type of atom in the reaction is the same on both the reactant and product sides. In a balanced chemical equation, the mass and the charge are both equal. P₄ + 4NaOH + 2H₂O → 2PH₃ + 2Na₂HPO₃.
A chemical equation is said to be balanced if the quantity of each type of atom in the reaction is the same on both the reactant and product sides. In a balanced chemical equation, the mass and the charge are both equal.
A chemical equation must balance according to the rule of conservation of mass. According to the rule, mass cannot be generated or removed during a chemical process.
To know more about balanced chemical equation, visit;
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15. If I make 94.8 L of O2, how many grams of H2O did I start with? (Show ALL work)
Answer:
double
Explanation:
.
9. Write a balanced nuclear equation for the following: The isotope Strontium-90 decays by Q-
decay (1 point)
OfSr — He +56 kr
OS → H +39 kr
o Sr + Be +38kr
99 Sr → He +3 Se
SAST +7+99 Sr
Answer: [tex]_{38}^{90}\textrm{Sr}\rightarrow _{36}^{86}\textrm{Kr}+_2^4\textrm{He}[/tex]
Explanation:
Alpha Decay: In this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. The mass number is reduced by 4 units and atomic number is reduced by 2 units.
General representation of an element is given as: [tex]_Z^A\textrm{X}[/tex]
where,
Z represents Atomic number
A represents Mass number
X represents the symbol of an element
General representation of alpha decay :
[tex]_Z^A\textrm{Sr}\rightarrow _{Z-2}^{A-4}Y+_2^4\alpha[/tex]
The balanced nuclear equation when the isotope Strontium-90 decays by Q- decay is :
[tex]_{38}^{90}\textrm{Sr}\rightarrow _{36}^{86}\textrm{Kr}+_2^4\textrm{He}[/tex]
Look at the questions labelled A, B, C, D. A How many substances are there in drinking water? B How much fluoride is in drinking water? C Is fluoride soluble in drinking water? D Should fluoride be added to drinking water? Which one of the questions cannot be answered by science alone? Tick one box.
Answer:
Magnesium, calcium and sodium.
Explanation:
Magnesium, calcium, sodium, and other beneficial minerals are the substances present in drinking water. Different regions have different fluoride concentration in their water such as in sea water, fluoride level is 1.1 mg/L while in surface water, the concentration is 0.01–0.3 ppm. Yes, fluoride is soluble in water. No, fluoride should not be added to drinking water because it harm for health. All the questions can be answered by science because it is related to chemistry.
Which of the following characterizes a covalent bond?
A. An electronegativity of greater than 1.7 for one of the atoms
B. An electronegativity difference of greater than 1.7 between two
atoms
C. An electronegativity difference of less than 1.7 between two
atoms
D. An electronegativity of less than 1.7 for one of the atoms
Answer A. The electronegativity of one atom is less than 1.7
Answer: its C
Explanation: i just got it wrong the right answer is c
What caused the shielding effect to remain constant across a period
Answer:
When moving from left to the right of a period, the number of electrons increases and the strength of shielding increases. As you move across period the number of shells remain same, the shielding effect will also remain constant.
Explanation:
PLEASE I WILL RATE YOU AND I DONT HAVE TIME PLEASEEE The volume of a substance is 20cm³ and its mass is 80 gm. Will this substance sink or float in water. Explain the reason showing calculation.
Answer:
80g=0.08kg
20cm=0.02m
density=m/v
= 0.08/0.02
=4kg/m^3
it is less than density of water so it floats
Help please How much water do you think the average household in the US uses every day?
Answer:
About 140 gallons?
Explanation:
help!!
The volume of air in the lungs of a typical human is 6.0 L. Traditional free divers, known for their ability to hold their breath during long dives while gathering objects from the ocean bottom, could descend underwater to a depth of 30 m where the pressure is four times that at the surface. What would be the volume of air in their lungs at 30 m?
please!!
Answer: these are for questions 1,2,4,5,7
Explanation: number 3: as the pressure in the volume decreases, the volume increases causing it to expand and eventually blow.
number 6: because the temperature and the amount of gas don’t change, these terms don’t appear in the equation. What Boyle’s law means is that the volume of a mass of gas is inversely proportional to its pressure. This linear relationship between pressure and volume means doubling the volume of a given mass of gas decreases its pressure by half.
hope this helps :))
What are the 3 primary states of matter?
Answer:
solid liquid gas
Explanation:
solid liquid gas
UNDERSTANDING CONCEPTS-Fill in the Blanks:
Periodic Trends: Write either INCREASE or DECREASE or VARIABLE:
17.lon size = Atom → Cation
18. Atomic radius (size) = Down a group
19. Electronegativity = Across a period left
20. Ionization energy = Down a group
Atom Anion
Across a period right
Up a group
Across a period left
Answer:
17 decrease
18 increase
19 increase
20 decrease
Explanation:
4. DBearded waste of Co-60 must be stored until it is no longer radioactive. Cobalt-60
waste weighing 14.5g has been in storage før 26.5 years. How much of this radioisotope
was present when the sample was put in storage?
464 g radioisotope was present when the sample was put in storage
Further explanationGiven
Sample waste of Co-60 = 14.5 g
26.5 years in storage
Required
Initial sample
Solution
General formulas used in decay:
[tex]\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}[/tex]
t = duration of decay
t 1/2 = half-life
N₀ = the number of initial radioactive atoms
Nt = the number of radioactive atoms left after decaying during T time
Half-life of Co-60 = 5.3 years
Input the value :
[tex]\tt 14.5=No.\dfrac{1}{2}^{26.5/5.3}\\\\14.5=No.\dfrac{1}{2}^5\\\\No=\boxed{\bold{464~g}}[/tex]
How many grams are in .705 moles of Cr?
Answer:
51.9961 grams
Explanation:
Just did worksheet
given that the mean relating atomic mass of chlorine gas is 35.5 and contains a mixture of two isotopes of mass number 35 and 37 . Calculate the ratio of each isotope in the naturally occurring element
The abundance of isotope 35 = 75%
The abundance of isotope 37 = 25%
Ratio isotope 35 : isotope 37 = 3 : 1
Further explanationGiven
Ar Cl = 35.5
Two isotopes of mass number 35 and 37
Required
The ratio of each isotope
Solution
If the abundance of isotope 35 is x%, then the abundance of isotope 37 is (100-x)%
35.5 = x%.35 + (100-x)%.37
35.5 = 0.35x+0.37(100-x)
35.5=0.35x-0.37x+37
0.02x=1.5
x=75
Balance the equation below:
Fe+CuSO4
[Fe+CuSO4 = FeSO4+Cu is not the correct answer]
Answer:
Fe+CuSO4 ⇒ FeCu+SO4
Answer:
Fe + CuSO4 = Fe2 (SO4)3 + Cu - Chemical Equation Balancer
Explanation:
To balance Fe + CuSO4 = Cu + FeSO4 you'll need to be sure to count all of atoms on each side of the chemical equation. When we balance equations with polyatomic ions, like SO4 2- it is helpful to consider the SO4 as one item as long as there is a SO4 on both sides of the chemical equation.
Once you know how many of each type of atom you have you can only change the coefficients (the numbers in front of atoms or compounds) to balance the equation.
Important tips for balancing chemical equations like Cu + FeSO4 | Iron and Copper(II) Sulfate:
- Only change the numbers in front of compounds (the coefficients).
- Never change the numbers after atoms (the subscripts).
- The number of each atom on both sides of the equation must be the same for the equation to be balanced.
Which element is most likely to have an oxidation number of +2?
O sodium (Na)
O magnesium (Mg)
O chlorine (CI)
O argon (Ar)
The answer is magnesium (Mg).
Some people have one sickle cell gene and one normal gene. They have few defctive cells and no symptoms because the sickle cell gene and one copy of a normal gene?Describe the process
Answer:
The sickle cell gene is recessive to the normal gene
Please find the description below
Explanation:
Sickle cell is a blood disease inherited genetically from one's parents. The sickle cell is associated with the blood genotype of an individual. The allele for sickle cell trait is S, while that of the normal gene is A. In this gene, the allele for normal gene (A) is dominant over the allele for sickle cell (S).
Hence, people that have one sickle cell gene (S) and one normal gene (A) will have an AS genotype. The individual will have few defective cells and no symptoms because the phenotypic expression of the sickle cell allele has been masked by the normal one.
A compound with a mass of 48.72g is found to contain 32.69g of zinc and 16.03g of sulfur. What is the percentage composition of the compound
Answer:
dic
Explanation:
What is sublimation and what type change is this?
Answer:
Sublimation is a physical change. When a substance sublimes, it changes from a solid to a gas without going through the liquid phase.
Explanation:
what is the position of lanthanides in Modern Periodic Table
Answer:
in sixth period out of 32 elements, 14 elements have been placed separately in horizontal row below periodic table.
A neutral aluminum atom is ionized and loses 3 electrons. What is the
charge of the resulting aluminum ion?
Explanation:
The neutral aluminium atom loses all 3 of its valence electrons to obtain a stable octet structure.
The aluminium ion has a positive charge of 3.
=> Al3+, Charge = +3.
Need help with this ASAP
Answer:
yes ?
Explanation:
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