When does boiling occur?
Water boils at 100 Degrees Celsius or 212 degrees Fahrenheit
PLZZZ HELP CHEM!!!!!!! Easy points!!!!!
Answer:
H+
Explanation:
Answer:
OH-
Explanation:
An Arrhenius base is any species that increases the concentration of
OH
Do liquids have higher coefficients of expansion than solids do
Answer: yes they do.
Explanation:
I'm tryna get more points because my other account got blocked for the next 48 hours.
(Don't be mad at me please)
Convert 4.6 atm to mmHg.
How many grams of H20 will be formed when 32.0 g H2 reacts with 16.0 g
O2? *
2H2 + O2 + 2H2O
9.00 g
16.0 g
18.0 g
32.0g
Answer:
18.0 g
Explanation:
M(H2) = 2.0 g/mol
32.0g * 1 mol/2 g= 16 mol H2
M(O2) = 32 g/mol
16.0 g * 1mol/32 g= 0.5 mol O2
2H2 + O2 ---> 2H2O
from reaction 2 mol 1 mol
given 16 mol 0.5 mol
We see that O2 is a limiting reactant.
2H2 + O2 +-------> 2H2O
from reaction 1 mol 2 mol
given 0.5 mol x mol
x =(0.5*2)/1= 1 mol H2O
M(H2O)= 18 g/mol
18 g/mol* 1 mol = 18 g H2O
How many carbon and hydrogen atoms are there?
Answer:
13 carbon and 24 hydrogen
Explanation:
There are 24 hydrogen atoms.
There are 13 carbon atoms.
is it true that Different atoms of an element have the same number of protons.
Answer:
No.
Explanation:
All the elements have the different number of protons .
Answer:
no it is not true because atoms may have the same number of neutrons but they never have the same number of protons
Explanation:
If a hypothetical future Earth has increased the amount of radiation emitted to 604 W/m, calculate the hypothetical global surface temperature in degrees Kelvin and then in Celsius
Answer:
Explanation:
For amount of radiation from a hot body there is Stefan's Boltzman's law which is given below .
E = e σ T⁴
E is amount emitted , e is emissivity , σ is stefan's constant = 5.67 X 10⁻⁸ W / m² . for earth e =.85 approx
E = .85 x 5.67 X 10⁻⁸ x T⁴
604 = .85 x 5.67 X 10⁻⁸ x T⁴
604 = 4.82 x 10⁻⁸ T⁴
T⁴ = 125.31 x 10⁸
T = 3.3457 x 10²
= 334.57K
Temperature in Celsius = 334.57 - 273
= 61.57 Celsius .
The combustion of 0.1240 kg of propane in the presence of excess oxygen produces 0.3110 kg of carbon dioxide. What is the limiting reactant?
PLEASE I REALLY NEED HELP!!!!
Answer:
The limiting reactant is the propane gas, C₃H₈ while the percentage yield is 83.77%
Explanation:
Here we have
Propane gas with molecular formula C₃H₈, molar mass = 44.1 g/mol combining with O₂ as follows
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Therefore, 1 mole of C₃H₈ combines with 5 moles of O₂ to produce 3 moles CO₂ and 4 moles of H₂O
Mass of propane = 0.1240 kg = 124.0 g
Number of moles of propane = mass of propane/(molar mass of propane)
The number of moles of propane = 124/44.1 = 2.812 moles
The molar mass of CO₂ = 44.01 g/mol
Mass of CO₂ = 0.3110 kg = 311.0 g
Therefore, number of moles of CO₂ = mass of CO₂/(molar mass of CO₂)
The number of moles of CO₂ = 311.0 kg/ 44.01 g/mol = 7.067 moles
Therefore, since 1 mole of propane produces 3 moles of CO₂, 2.812 moles of propane will produce 3 × 2.812 moles or 8.44 moles of CO₂
Therefore;
The limiting reactant is the propane gas, C₃H₈, since the oxygen is in excess
Hence
[tex]The \ percentage \ yield = \frac{Actual \, yield}{Theoretical \, yield} \times 100 = \frac{7.067}{8.44} \times 100 = 83.77 \%[/tex]
The percentage yield = 83.77%.
What is the name for a star that has two shells of hydrogen and helium undergoing fusion?
A.
asymptotic giant branch star
B.
supergiant
C.
hypergiant
D.
supernova
Answer:
I am not so sure but I think it is A.
Explanation:
If i got it wrong sorry.... :(
Answer:
the answer is A hope it helps
why is the international space station in orbit
Answer:
The ISS provides a location in the relative safety of low Earth orbit to test spacecraft systems that will be required for long-duration missions to the Moon and Mars.
Explanation:
What mass in grams of hydrogen is produced by the reaction of 2.0 g of magnesium? (Make sure to balance the reaction first)
Mg(s) + H2O(1) --> Mg(OH)2(s) + H2 (8)
Answer:
0.164541341 g H2
Explanation:
1) Convert grams to moles by dividing by RMM of Magnesium (24.31g).
2g Mg * (1 mol Mg / 24.31 g Mg) = 0.082270671 mol of Mg
2) Use the balanced equation's ratio of 1 mol Mg: 1 mol H2.
0.082270671 mol of Mg = 0.082270671 mol of H2
3) Convert the mol of H2 back into grams by multiplying by H2's RMM (2 g).
0.082270671 mol of H2 * 2 g H2 = 0.164541341 g H2
* Answer can be rounded to your liking *
1.
__________ are the most organized state of matter.
Solids
Liquids
Gases
2.
States of matter change when ________ is added or removed.
Plasma
Energy
3.
Which state of matter has the most movement of its particles?
Solid
Liquid
Gas
Solids are the most organized state of matter. States of matter change when energy is added or removed. Gas is the state of matter has the most movement of its particles.
What are the states of matter?The states of matter are the different forms of the matter in which it can exist. They are solids, liquids and gases. Solids are the states of matter in which molecules are very near to each other. They have fixed shape and volume. Liquids is the states of matter in which molecules are a little far from each other. They have different shape and fixed volume. Gas is the states of matter in which molecules are a very far from each other. They have different shape and different volume.
There are two more states of matter which are called as Plasma, Bose Einstein Condensate.
Plasma have highest energy and Bose Einstein Condensate have lowest energy.
Therefore, Solids are the most organized state of matter. States of matter change when energy is added or removed. Gas is the state of matter has the most movement of its particles.
To learn more about States of matter click:
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What are some true statements about light
Answer:It allows us to see things so we know where we are going that’s why at night we had lamp posts
Explanation:
What is similar about igneous rock and metamorphic rock formation?
Answer:
I think they both need heat.
Explanation:
What mass of chromium would be produced from the reaction of 57.0 g of potassium with 199 g of chromium(II) bromide according to the following reaction? 2 K + CrBr2 2 KBr + Cr *
Answer:
38g of Cr
Explanation:
Step 1:
The balanced equation for the reaction:
2K + CrBr2 —> 2KBr + Cr
Step 2:
Determination of the masses of K and CrBr2 that reacted and the mass of Cr produced from the balanced equation.
This is illustrated below:
Molar mass of K = 39g/mol
Mass of K from the balanced equation = 2 x 39 = 78g
Molar Mass of CrBr2 = 52 + (80x2) = 212g
Mass of CrBr2 from the balanced equation = 1 x 212 = 212g
Molar Mass of Cr = 52g/mol
Mass of Cr from the balanced equation = 1 x 52 = 52g
From the balanced equation above,
78g of K reacted with 212g of CrBr2 to produce 52g of Cr.
Step 3:
Determination of the limiting reactant.
This is illustrated below:
From the balanced equation above,
78g of K reacted with 212g of CrBr2.
Therefore, 57g of K will react with = (57 x 212)/78 = 154.92g of CrBr2.
From the above calculation, we can see that a lesser mass (i.e 154.92g) than what was given ( i.e 199g) of CrBr2 is needed to react completely with 57g of K. Therefore, K is the limiting reactant and CrBr2 is the excess reactant.
Step 4:
Determination of the mass of Cr produced by the reaction.
In this case, the limiting reactant will be use because it will give the maximum yield of Cr as all of it is used up in the reaction process. The limiting reactant is K and the mass of Cr produced is obtained as follow:
From the balanced equation above,
78g of K reacted to produce 52g of Cr.
Therefore, 57g of K will produce = (57 x 52)/78 = 38g of Cr.
Therefore, 38g of Cr is produced from the reaction.
In most mirrors, the virtual image appears to come from behind the mirror. True False
Answer
False
Explanation:
In the water cycle diagram above, which letter represents
groundwater?
Select One:
Q
S
T
R
Answer:t
Explanation:bc
What is the molariity of a 50.0 mL aqueous solution containing 10.0 grams of copper (II) sulfate, CuSO4?
Answer:
The molarity is 1.26 [tex]\frac{ moles}{L}[/tex]
Explanation:
Molarity is a unit of concentration that is based on the volume of a solution and represents the number of moles of solutes contained in a liter. The molarity of a solution is calculated by dividing the moles of the solute by the liters of the solution and is expressed in units (moles / liter).
[tex]Molarity=\frac{number of moles of solute}{Volume}[/tex]
You must calculate the number of moles of CuSO₄. So, being:
Cu: 63.54 g/moleS: 32 g/moleO: 16 g/molethe molar mass of CuSO₄ is
CuSO₄=63.54 g/mole + 32 g/mole + 4* 16 g/mole= 159.54 g/mole
Then it is possible to apply the following rule of three: if 159.54 g of CuSO₄ are present in 1 mole, 10 g in how many moles are they?
[tex]moles=\frac{10 g*1 mole}{159.54 g}[/tex]
moles= 0.063 moles
Then:
number of moles of solute= 0.063 molesVolume= 50 mL= 0.05 L (Being 1L=1000 mL)Replacing in the definition of molarity:
[tex]Molarity=\frac{0.063 moles}{0.05 L}[/tex]
Molarity= 1.26 [tex]\frac{ moles}{L}[/tex]
The molarity is 1.26 [tex]\frac{ moles}{L}[/tex]
How killers cover up their crimes
Answer:
They hide their evidence and destroy any if absolutely necessary. You also would need to wear gloves, so you dont put your identity everywhere. Also, you need to flee and just forget that what you did, did not happen. And hope you dont get arrested xD
Explanation:
Why is 4,4dimethyl hexane name is wrong
Answer:
3,3-dimethyl hexane
Explanation:
CH3
I I I I I I
- C - C - C - C - C - C-
I I I I I I
CH3
50 POINTS!!!! Please Help I'm being timed and this would help so much! 50 POINTS!!!!
Calculate the hydrogen ion concentration [h+] for the aqueous solution in which [oh-] is 1 x 10^-2 mol/l. Is this solution acidic, basic, or neutral? Show your work.
Answer:
[H⁺] = 1.0 x 10⁻¹² M.
Explanation:
∵ [H⁺][OH⁻] = 10⁻¹⁴.
[OH⁻] = 1 x 10⁻² mol/L.
∴ [H⁺] = 10⁻¹⁴/[OH⁻] = (10⁻¹⁴)/(1 x 10⁻² mol/L) = 1.0 x 10⁻¹² M.
∵ pH = - log[H⁺] = - log(1.0 x 10⁻¹² M) = 12.0.
∴ The solution is basic, since pH id higher than 7 and also the [OH⁻] > [H⁺].
I think- IDK
5. Which statement is NOT true?
a. Light travels with or without a medium.
b. Sound must have a medium to travel through.
c. Both light and sound must have a medium to travel through.
d. Light travels faster than sound.
Answer:
A: true.
B: true.
C: false
D: true.
Explanation:
Light is an electromagnetic wave which travels regardless of whether there is medium. sound is a wave disturbance in medium meaning it must have matter. Also light is much faster then sound.
3 hazards that occur in teaching and learning of science
True or False? The Grand Canyon was probably formed through wind abrasion.
Answer:
True.
Explanation:
Wind abrasion is a form of erosion.
Hope I helped ya.
< Sarah >
Which term describes this reaction?
A- addition
B- condensation
C- elimination
D- substitution
Answer:
C.
Explanation:
This is a reaction of elimination, because the water was removed and because of it double bond is formed.
10. You can protect yourself from radiation by
going up to a higher elevation
increasing the time you are exposed
increasing your water intake
getting further away from the radiation source
Answer:
You can protect yourself from radiation by getting further away from the radiation source .
If matter is neither created nor destroyed, why can’t we just go directly from grams of reactant to grams of product?
According to the law of conservation of mass, there is no net change in the reactants' and products' masses before and after a chemical reaction.
What is chemical reaction?Chemical reaction is defined as a procedure where one or more compounds, known as reactants, are changed into one or more new substances, known as products. When atoms establish or break chemical bonds, chemical reaction take place.
Law of conservation of mass is defined as a chemical reaction requires that the total mass of the reactants and products be equal. Law of conservation of mass also stated that mass is always conserved throughout chemical reactions and cannot be created or removed.
Thus, according to the law of conservation of mass, there is no net change in the reactants' and products' masses before and after a chemical reaction.
To learn more about law of conservation of mass, refer to the link below:
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What type of elements are ionic bonds composed of?
Answer:
A metal and a nonmetal
Explanation:
Picture NaCl, the most famous example of an ionic compound. Two ions, Na+ (sodium) and Cl- (chlorine) are joined by an ionic bond.
Sodium, the metal, gives up an electron to chlorine.
Chlorine, the nonmetal, accepts an electron from sodium.
That way both have 8 electrons in their outer shell! This is the way ionic bonds function.
pH of a 0.00072 M HCl solution.
Answer:
3.14
Explanation:
pH=-log(H+)
- Hope that helps! Please let me know if you need further explanation.
