Answers
Related Questions
How do molecular shape affect polarity
Answers
Chemical Reactions
Substances in a fire extinguisher help prevent air from reaching a burning material. Why would this be a good way to fight a fire?
Answers
Answer:
It works by separating the fuel from the oxygen. The oxygen comes from the air. It is the same oxygen we breathe. Since the oxygen has to be in contact with the fuel, if you can coat the fuel with something that keeps the oxygen away, the fire will go out which is what the fire extinguisher does.
for the balanced equation: 2P + 3Br2 -> 2PBr2, how many moles of P reacted, if 0.175 moles of Br2 are produced
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0.175 moles Br2 • —— • ———
1 mole Br2 3 moles Br2
Multiply everything on top and divide by everything multiplied on bottom
Can someone please answer this.
Answers
condenation means what
Answers
Answer: Heyaa! :)
Condensation is the process of water vapor turning back into liquid water!
Explanation:
Hopefully this helps you!
-Matthew ~
If you were to look up at the moon and see the shape of the moon as a circle, what would the next observable shape in the cycle of the moon be? (2 points)
Group of answer choices
Crescent
Full circle
Half circle
Answers
Answer:
Half circle
Explanation:
because in the next day between 5O'clock the sun will rise then the moon will therefore created to be in a half moon
all the living and nonliving things in an specific area
Answers
Answer: An Ecosystem
Explanation:
How do you know the correct number of significant figures to include in an answer?
Answers
Answer:
Explanation:
1 Non-zero digits are always significant.
2 Any zeros between two significant digits are significant.
3 A final zero or trailing zeros in the decimal portion ONLY are significant.
How many moles of gas are in a 30-liter scuba canister if the temperature of the canister is 300 K and the pressure is 15,200 torr?
Answers
Answer:
n = 0.487⋅mol
Explanation
n=PVRT
=0.4⋅atm×30⋅L0.0821⋅L⋅atm⋅K−
1⋅mol−1×300⋅K
=0.487⋅mol
If 0.15M solution of HNO2 has a pH of 1.98, determine the % ionization of HNO2.
Answers
The % ionization of HN0₂ is 6.98 %
What is percentage Ionization ?
The relative strengths of acids may be determined by measuring their equilibrium constants in aqueous solutions.
In solutions of the same concentration, stronger acids ionize to a greater extent, and so yield higher concentrations of hydronium ions than do weaker acids.
Percentage Ionization is the measure of the strength of an acid is its percent ionization.
The percent ionization of a weak acid is the ratio of the concentration of the ionized acid to the initial acid concentration, times 100:
The chemical equation for the dissociation of the nitrous acid is:
HNO₂(aq)+H₂O(l)⇌NO²⁻(aq)+H₃O⁺(aq).
[tex]\rm \% \;ionization = \dfrac{[H_{3}O^{+} ] _{eq} }{[HNO_{2}]_{0} } \times 100[/tex]
[tex]\rm 10^{-pH} =[/tex] [H₃O⁺] ,
we find that with given pH of 1.98
[tex]10^{-1.98} =[/tex] 0.01047128548 M=[H₃O⁺]
Molarity of HN0₂ = 0.15 M
so that percent ionization is
[tex]\% ionization = \dfrac{0.01047128548 }{0.15 } \times 100[/tex]
[tex]\% ionization = 6.98 \%[/tex]
Therefore the % ionization of HN0₂ is 6.98 %
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What is the volume of 300. g of mercury vapor at 822K and 0.900 atm?
Answers
Answer:
112.2L
Explanation:
Volume (V) = 300g
Temperature (T) = 822K
Pressure (P) = 0.9atm
using the ideal gas equation;
[tex]PV = nRT\\\\ V = \frac{nRT}{P}[/tex]
Molar gas constant (R) = [tex]0.0821L.atm/mol.K[/tex]
Mole (n) = [tex]\frac{Mass (m)}{Molar mass (M)}[/tex] Molar mass of Mercury = 200.59g/mol
[tex]n = \frac{300g}{200.59 g/mol} \\[/tex]
= 1.496mol
Now, the volume can be calculated;
V = [tex]\frac{1.496mol* 0.0821L.atm/mol.K*822K}{0.9atm}[/tex]
∴Volume of mercury = [tex]112.2L[/tex]
Newton’s second law of motion
Answers
When an object of mass 2Kg and applied force is 10N then acceleration is 5 m/s/s.
What is Newton's second Law?Newton's second Law of motion will be represented as:
F = m.a, where
F = forcem = mass of objecta = accelerationAcceleration for the first row will be calculated as:
a = 10/2 = 5 m/s/sAcceleration for the second row will be calculated as:
a = 40/5 = 8 m/s/sMass for the third row will be calculated as:
m = 20/5 = 4kgMass for the forth row will be calculated as:
m = 45/45 = 1 kgForce for the fifth row will be calculated as:
F = (3)(3) = 9 NHence, acceleration of the object whose mass is 2kg and force on that object is 10N is 5m/s/s.
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Question 6
2 pts
The illustration shows all the forces in Newtons (N) acting on a box. The sum of all the
forces acting on the box results in a force acting on the box
5N
5N
O NF= 10 N balanced
O NF= 5N to the right
O NF= 0 Balanced
NF= 5N to the left
Answers
Answer:
Im pretty sure that 5N to the Right is correct answer
What is the mass percent of a sugar solution when 489 grams of sugar is combined with 877 grams of water?
Answers
I will mark brainliest
Answers
The equation which is balanced is S₈ + 12O₂ → 8SO₃.
What is balance reaction?Balanced reactions are those reactions in which all entities are present on the reactant side as well as on the product side of the reaction.
6S₈ + 8O₂ → 6SO₃Above equation is unbalanced as all atoms are not present in same amount.
2S₈ + 3O₂ → 2SO₃Above equation is unbalanced as all atoms are not present in same amount.
S₈ + 12O₂ → 8SO₃Above equation is balanced as all atoms are present in same amount on reactant side as well as product side.
S₈ + 24O₂ → 8SO₃Above equation is unbalanced as all atoms are not present in same amount.
Hence, S₈ + 12O₂ → 8SO₃ is a balanced equation.
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Scientific knowledge can withstand the test of time because
A.
scientific theories have been proven beyond doubt.
B.
advancements in technology have no impact on science.
C.
exceptions can be made regarding scientific laws.
D.
it is open to change as new evidence or data is discovered.
Answers
Answer:
D
Explanation:
A student hits a nail with a hammer. During the collision, there is _____.
Group of answer choices
a force on the hammer but not on the nail
a force on the nail but not on the hammer
a force on the nail and also on the hammer
no force on either object in the collision
Answers
and also the hammer
12) Which statement is not a component of the particle kinetic molecular theory of matter? A) Atoms of different elements are identical. B) Particles of matter have spaces between them. C) Particles of matter are constantly in motion. D) Atoms of the same element are essentially identical.
Answers
Answer:
c i got it right on usatestprep
Explanation:
............
What molarity should the stock solution be if you want to dilute 23.759 mL to 0.63 L and have the final concentration be 0.63 M?
Answers
M1.V1=M2V2
M1 x 23.759 = 0.63 x 0.63
M1 = 0.017 M
Ethanol is found to have a relative molecular mass of 46. If its molecular formula is C2HxOH. What is the value of X in the formula?
Answers
Answer:
The value of x in ethanol is 5
Explanation:
Given molar mass, you can subtract the molar masses of different elements present to find the missing amount of hydrogen; in other words:
Carbon*2 + Hydrogen*x + Oxygen*1 + Hydrogen*1 = 46
Molar mass carbon = 12.01
Molar mass hydrogen = 1
Molar mass oxygen = 16
12.01*2 g/mol + 1*x g/mol + 16*1 g/mol + 1*1 g/mol = 46 g/mol
Subtracting all knowns from the current molar mass gives
46 - 41.02 = 4.98
This means that x amounts of hydrogen has a molar mass of 4.98, or roughly just 5. Since each hydrogen has a molar mass of one, that means that there are 5 hydrogens missing and the complete molecular formula is C2H5OH
oxidation of Nitrogen in NO2
Answers
Explanation:
oxidation of Nitrogen in NO2 is +4
which of the following is an example of gentic engineering?]
A. A string of animo acids bonded together to form a protein that controls a trait
B. In the nucleus of a human cell, DNA strands sepreate and are used as a template for a new RNA molecule.
C. A string of three bases within an RNA molecule codes for a specific anmio acid.
D. A bacterial cell produce human insullian because human DNA has been added to the bacterial DNA.
Answers
Determine weather each of the following will be saturated or unsaturated at 50 degree celcious
Answers
The solubility of the solutes in the solution will determine whether each of the solutions will be saturated or unsaturated at 50 degree celcius.
What are saturated and unsaturated solutions?Saturated solutions are solutions which contains as much solute as they can dissolve at that temperature in the presence of undissolved solute.
An unsaturated solution is a solution which contains less solute than it can dissolve at that temperature.
The solubility of a solute determines whether its solution will be saturated or unsaturated at a given temperature.
Therefore, the solubility of the solutes in the solution will determine whether each of the solutions will be saturated or unsaturated at 50 degree celcius.
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state the equation for the formation of ethane from its elements and ghen detwrmine the value for the standard enthalpy of formation of ethane
Answers
The standard enthalpy of formation of ethane is determined as -192.5 kJ/mol.
Reaction for the formation of ethaneThe reaction for the formation of ethane is given as;
2C + 3H₂ → C₂H₆
Where;
C is carbon (graphite)H is hydrogen C₂H₆ is ethaneStandard enthalpy of formation of ethaneThe standard enthalpy of formation of ethane is calculated as follows;
ΔH = ΔH₁ + ΔH₂ + ΔH₃
where;
ΔH₁ is heat of formation of graphite = -286 kJ/molΔH₂ is heat of formation of hydrogen = -393.5 kJ/molΔH₃ is heat of formation of ethane = 1560 kJ/mol2C + 3H₂ → C₂H₆
ΔH = 2(-286) + 3(-393.5) + 1(1560)
ΔH = -572 - 1180.5 + 1560
ΔH = -192.5 kJ/mol
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oxidation of Nitrogen in N2O3
Answers
Explanation:
oxidation of Nitrogen in N2O3 is +3What is 0.0032 gallons in mL?
Answers
Answer:
14.547 ml
Explanation:
1 gallon= 4546.09 ml
Which statement illustrates the difference between a chemical reaction and a nuclear reaction?
a. A nuclear reaction releases more energy per gram and appears to violate the law of conservation of mass.
b. A nuclear reaction releases less energy per gram and appears to violate the law of conservation of mass.
c. A nuclear reaction releases more energy per gram but does not appear to violate the law of conservation of mass.
d. A nuclear reaction releases less energy per gram but does not appear to violate the law of conservation of mass.
Answers
Some main differences between the chemical and nuclear reactions are:
- The nuclear reaction releases more energy per gram.
- The nuclear reaction takes place in the nucleus of the atom.
- In the nuclear reaction, part of the mass is converted into energy, which violates the law of conservation of mass.
As the temperature of a gas increases, the volume of the gas will______ if the pressure remains the same
Answers
Answer:
increasesExplanation:
The volume of the gas increases as the temperature increases. As temperature increases, the molecules of the gas have more kinetic energyAnswer:
Explanation: stay the same
6. How much of 0.25 M KI solution, in liters, is required to completely precipitate all the Pb²+ in
0.125 L of 0.75 M Pb(NO3)2?
2 KI + Pb(NO3)2 → Pbl₂ + 2 KNO3
Please help me
Answers
If we write the equation of the reaction that will take place, it is:
2HNO₃ + Na₂CO₃ → 2NaNO₃ + H₂CO3
The molar ratio of 2HNO₃ : Na₂CO₃ = 1 : 2
Therefore, we can set up the equation:
M₁V₁ = 2M₂V₂
Where the left side of the equation has the molarity and volume of HNO₃ and the right side has the molarity and concentration of Na₂CO₃. Substituting:
M₁ = (2 x 0.108 x 35.7) / 25
M₁ = 0.308
The amount of 0.25 M KI solution is needed is 0.38 L.
What is solution?Solution is defined as a homogeneous mixture of two or more substances in relative amounts that can be continually altered up to what is known as the limit of solubility.
It can also be defined as a combination of one substance dissolved in another with the same properties throughout.
The solution can be homogenous or heterogenous mixture.
2 KI + Pb(NO3)2 → Pbl₂ + 2 KNO3
As per the reaction
The ratio is KI : Pb(NO3)2 is 1:1
So, we use M1V1 = M2V2
As given, M1 = 0.25 M
M2 = 0.75 M
V2 = 0.125 L
So, V1 = M2 V2 / M1
V1 = 0.75 x 0.125 / 0.25
V1 = 0.38 L
Thus, the amount of 0.25 M KI solution is needed is 0.38 L.
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write the action of aqua regia on gold
Answers
Answer:For alloys greater than 14 K, aqua regia is used to test the gold. Aqua regia dissolves gold itself (as well as dissolving the silver and copper components) and for this reason it is used to test higher karat gold alloys.
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