Answer:
for 1 mole CH4 1 mole of CO2 and 2 mole of H20 is produced.
if 2.5 mole CH4 is reacted 2.5 mole CO2 and 5 mole of H20 is produced
What is weather? Can you explain?
Answer:
weather is the state of the air at a particular place and time.
Explanation:
weather can be warm or cold, dry or wet, windy or cloudy
helpppp me pleaseeee asaaap
kaloy also pala spark kabootan paano
Four members of a school first eleven cricket team are also members of the first fourteen rugby team How
many boys play for at least one of the two teams?
Select one
a 12
b 22
C. 14
d 21
Answer:
total 11+14 is 25
now 4 are common and counted twice so subtract 4 so answer is 21
For the reaction represented by the equation 2h+O2– 2H2O, how may grams of water are produced from 6.00 mol of hydrogen?
Atomic mass of hyorogen = 1.0gmol
Atomic mass of oxygen = 16.0 omo
Answer:
Mass = 108 g
Explanation:
Given data:
Mass of water produced = ?
Number of moles of hydrogen = 6.00 mol
Solution:
Chemical equation:
2H₂ + O₂ → 2H₂O
Now we will compare the moles of hydrogen with water.
H₂ : H₂O
2 : 2
6 : 6
Mass of water:
Mass = number of moles × molar mass
Mass = 6 mol × 18 g/mol
Mass = 108 g
What happens to the particles of a gas when the gas changes into a liquid? (5 points)
Oa
They move faster.
Oь
They slow down
Oc
They increase in size,
Od
They decrease in size.
Answer:
ь
They slow down
Explanation:
Decide which element probably forms a compound with oxygen that has a chemical formula most and least similar to the chemical formula of the compound formed by oxygen and magnesium.
Comparing chemical formula of compound formed with oxygen:
strontium potassium selenium lithium
most similar to magnesium
least similar to magnesium
Answer: most similar o magnesium : strontium
least similar to magnesium : selenium
Explanation:
For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
Magnesium forms a cation having an oxidation state of +2 called as [tex]Mg^{2+}[/tex] and oxygen forms an anion with oxidation state of -2. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral [tex]MgO[/tex]
Thus an element which will form cation with same oxidation state of +2 will be strontium and form [tex]SrO[/tex].
Lithium and potassium both belong to group 1 and thus will form cations with oxidation state of +1 and form [tex]Li_2O[/tex] and [tex]K_2O[/tex] respectivley.
Selenium is a non metal and thus will form covalent compound with formula [tex]SeO_2[/tex]
100 points PLEASEEE HELP ASAPPPP PLEASE Identify the kinds of bonds present between/among the given atoms/elements:
Sodium (Na) and Chlorine (Cl) _____________
Oxygen( O) and Oxygen ( O) ______
Sulfur ( S) and Oxygen ( O) ______
Nitrogen (N) and Nitrogen ( N) ________
Aluminum (Al ) and Bromine ( Br) ______
Answer:
20, 50, 25
Explanation:
I just figured it out somehow in my brain.
Can anyone help me with my Chemistry homework? I’m struggling and i need help. Since I can’t message anyone in here, I will you my number. Comment yes if you can, I’d really appreciate it
Answer:
yes i can help you ig ........
Which statement explains why astronauts appear to bounce when they are walking on the moon?
The force of gravity acting on the astronauts is stronger on the moon than on Earth
The force of gravity acting on the astronauts is weaker on the moon than on Earth.
The force of air resistance acting on the astronauts is weaker on the moon than on Earth.
The force of air resistance acting on the astronauts is stronger on the moon than on Earth
Astronauts appear to be bouncing on the moon because the force of gravity is weaker on the moon.
What is the importance of the force of gravity?On planets such as Earth and natural satellites such as the moon, gravity causes objects are pulled towards the center of the planet/natural satellite.
How is gravity different on the moon?On the moon, this force is weaker than on the Earth. Indeed, the gravity of Earth is equivalent to 9,807 m/s, while the gravity on the moon is 1,62 m/s.
This causes objects are still pulled towards the center of the moon but they are pulled with a much weaker force. Therefore, when people walk on the moon they seem to bounce.
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Which of the following are examples of conservable quantities? a. potential energy and length c. mechanical energy and mass b. mechanical energy and length d. kinetic energy and mass
Answer:
b
Explanation:
The conserved quantities obeys the conservation laws. Among the given options mechanical energy and mass are examples of conservable quantities. The correct option is C.
What are conserved quantities?A conserved quantity is defined as something which remains constant in amount over time and it cannot be created nor destroyed. In an isolated system, energy is an example of a conserved quantity.
The conserved quantities can change form one state to another, for example from light to heat, but the total amount of energy in the system will not change. Some of the other examples of conserved quantities are electric charge, momentum and angular momentum.
The mass can neither be created nor be destroyed, so it is a conserved quantity. Similarly the mechanical energy which is the sum of potential and kinetic energy is also conserved.
Thus the correct option is C.
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what are evidence that a chemical change has occurred
Answer:
Gas Bubbles Appear. Gas bubbles appear after a chemical reaction has occurred and the mixture becomes saturated with gas.
Formation of a Precipitate.
Color Change.
Temperature Change.
Production of Light.
Volume Change.
Change in Smell or Taste.
A sample of nitrous oxide has a volume of 120 L at 1.500 mm Hg and = 10°C. Calculate
its pressure when its volume is compressed to 50 L and its temperature increased to
34°C
Answer:
3.91 mmHg
Explanation:
From the question given above, the following data were obtained:
Initial volume (V₁) = 120 L
Initial pressure (P₁) = 1.5 mmHg
Initial temperature (T₁) = 10 °C
Final volume (V₂) = 50 L
Final temperature (T₂) = 34 °C
Final pressure (P₂) =?
Next, we shall convert 10 °C and 34 °C to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273
Initial temperature (T₁) = 10 °C
Initial temperature (T₁) = 10 °C + 273
Initial temperature (T₁) = 283 K
Final temperature (T₂) = 34 °C
Final temperature (T₂) = 34 °C + 273
Final temperature (T₂) = 307 K
Finally, we shall determine final pressure of the gas as follow:
Initial volume (V₁) = 120 L
Initial pressure (P₁) = 1.5 mmHg
Initial temperature (T₁) = 283 K
Final volume (V₂) = 50 L
Final temperature (T₂) = 307 K
Final pressure (P₂) =?
P₁V₁/T₁ = P₂V₂/T₂
1.5 × 120/283 = P₂ × 50 / 307
Cross multiply
P₂ × 50 × 283 = 1.5 × 120 × 307
P₂ × 14150 = 55260
Divide both side by 14150
P₂ = 55260 / 14150
P₂ = 3.91 mmHg
Thus, the new pressure of the gas is 3.91 mmHg
what are qualitative and quantitative significance of chemical equation.
Explanation:
Well, the qualitative significance of a chemical equation is that it shows us concisely, and economically how matter interacts chemically in the breaking, and making of chemical bonds to form new substances…
Quantitatively, ALL stoichiometrically balanced equations show us that MASS is CONSERVED, and that “TANSTAAFL” , i.e. “there ain’t no such thing as a free lunch” , operates. And so 5∙g , 5∙kg , 5∙tonne of total REACTANT from all sources, leads to AT MOST to 5∙g , 5∙kg , 5∙tonne of total PRODUCT…. and in practice, we are not even going to get that… Electronic charge is also conserved in every chemical reaction … and we use this conservation principle when we write redox equation…
Chemical equations are the symbolic expression of the compounds and elements. It shows the quality and quantity by the chemical interaction and stoichiometry coefficient.
What is a chemical equation?A chemical equation expresses the chemicals of the reactant and the product side in the form of symbols and mathematical expressions. They are quantitatively significant as they represent the stoichiometry coefficient. It tells about the moles needed by the reactants needed for product formation.
They also are qualitatively important as they depict the phases of the reactants and the products and tell the type of reaction like the decomposition, oxidation, reduction, combustion, etc. undergone by the substances.
Therefore, the chemical equation is significant both qualitatively and quantitatively.
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A particular first-order reaction has a rate constant of 1.35 × 10^2 s−1 at 25.0 ∘C. What is the magnitude of k at 65.0∘C if Ea = 55.5 kJ/mol.
The magnitude of k at 65.0∘C : 1912.7 /s
Further explanationGiven
k at 25 °C = 1.35 x 10² /s k1
T₁=25 + 273 = 298 K
T₂=65 + 273 = 338 K
Required
the magnitude of k at 65.0∘C
Solution
Arrhenius Equation :
[tex]\tt ln(\dfrac{k_1}{k_2})=(\dfrac{1}{T_2}-\dfrac{1}{T_1})\dfrac{Ea}{R}[/tex]
R : gas constant= 8.314 J/molK
Input the value :
[tex]\tt ln(\dfrac{1.35\times 10^2}{k_2})=(\dfrac{1}{338}-\dfrac{1}{298})\dfrac{55.5.10^3}{8.314}\\\\ln(\dfrac{135}{k_2})=-2.651\rightarrow \dfrac{135}{k_2}=e^{-2.651}\rightarrow k_2=1912.7[/tex]
Temperature,
[tex]T_1 = 25^{\circ} C[/tex] or, [tex]298 \ K[/tex][tex]T_2 = 65^{\circ} C[/tex] or, [tex]338 \ K[/tex]Rate constant,
[tex]1.35\times 10^2 \ s^{-1}[/tex]Gas constant,
[tex]R = 8.314 \ J/mol[/tex]By using the Arrhenius equation, we get
→ [tex]ln (\frac{k_1}{k_2} ) = (\frac{1}{T_2} - \frac{1}{T_1} )\frac{Ea}{R}[/tex]
By substituting the values, we get
→ [tex]ln (\frac{1.35\times 10^2}{k_2} ) = (\frac{1}{338} - \frac{1}{298} )\frac{55.5\times 10^3}{8.314}[/tex]
→ [tex]ln (\frac{135}{k_2} ) = -2.651[/tex]
[tex]\frac{135}{k_2} = e^{-2.651}[/tex]
[tex]k_2 = 1912.7[/tex]
Thus the response above is right.
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Describe what happens in the cell before the chemical reaction.
___________________________________________________________
Answer:
Chemical reactions that take place inside living things are called biochemical reactions. The sum of all the biochemical reactions in an organism is referred to as metabolism. Metabolism includes both exothermic (heat-releasing) chemical reactions and endothermic (heat-absorbing) chemical reactions.
___________________________________________________________
In one of his experiments, Lavoisier placed 10.0 grams of mercury (II) oxide into a sealed container and heated it. The mercury (II) oxide then reacted in the presence of heat to produce 9.3 grams of mercury. Oxygen gas was another product in the reaction. According to the law of conservation of mass, how much oxygen gas would have been produced?
Oxygen gas produced : 0.7 g
Further explanationGiven
10.0 grams HgO
9.3 grams Hg
Required
Oxygen gas produced
Solution
Reaction⇒Decomposition
2HgO(s)⇒2Hg(l)+O₂(g)
Conservation of mass applies to a closed system, where the masses before and after the reaction are the same
mass of reactants = mass of products
mass HgO = mass Hg + mass O₂
10 g = 9.3 g + mass O₂
mass O₂ = 0.7 g
When poured into water, glycerol (also a liquid) falls to the bottom of the
beaker. Which of the following is a true statement? *
The water is less dense than the glycerol
An object that floats in water will always float in glycerol
O An object that floats in glycerol will always float in water
Answer:
im going to go with the water is less dense than the glycerol
Explanation:
The salinity of sea water represents the amount of NaCl (salt) dissolved in the water.
True
False
Jay and Jeff were responsible for recording the class weather data each day in march. What weather instrument, seen here, should they use for measuring the daily wind speed
Answer:
east
Explanation:
If an archaebacterial species lives in a pool that is 0.01 M HCl(aq), what is the pH of the water
Answer:
2
Explanation:
From the question given above, the following data were obtained:
Molarity of HCl = 0.01 M
pH =?
Next, we shall determine the concentration of the hydrogen ion, [H⁺] in the pool. This can be obtained as follow:
HCl (aq) <=> H⁺ (aq) + Cl¯ (aq)
From the balanced equation above,
1 mole of HCl produced 1 mole of H⁺.
Therefore, 0.01 M HCl will also produce 0.01 M H⁺.
Thus, the concentration of the hydrogen ion, [H⁺] in the pool is 0.01 M
Finally, we shall determine the pH of the pool.
This can be obtained as follow:
Concentration of the hydrogen ion [H⁺] = 0.01 M
pH J?
pH = – Log [H⁺]
pH = – Log 0.01
pH = 2
Therefore, the pH of the pool is 2.
A: moving away from
B: moving towards
C: sliding past
Answer:
B.moving towards each other
Answer:
B. moving towards
they move towards each other to create the trench
so what exactly is motion?
Answer:
just the process or action of moving or being moved lol
What is the molar solubility of nickel(II) sulfide in 0.091 M KCN? For NiS, Ksp = 3.0 × 10 –19; for Ni(CN) 4 2–, Kf = 1.0 × 10 31.
Answer:
The value is [tex]x = 0.0227 \ M[/tex]
Explanation:
From the question we are told that
The concentration of [tex]KCN \ \ i.e \ \ CN^{-}[/tex] is [tex]M_1 = 0.091 \ M[/tex]
The solubility product constant for [tex]NiS[/tex] is [tex]K_{sp} = 3.0 *10^{-19}[/tex]
The stability constant for [tex]Ni(CN)_4 ^{2-}[/tex] is [tex]K_f = 1.0 *10^{31}[/tex]
Generally the dissociation reaction for NiS is
[tex]Ni S \underset{}{\stackrel{}{\rightleftharpoons}} Ni^{2+} + S^{2-}[/tex]
Generally the formation reaction for [tex]Ni(CN)_4 ^{2-}[/tex] is
[tex]4CN^- + N_i ^{2+} \underset{}{\stackrel{}{\rightleftharpoons}} \ Ni(CN)^{2-}_{4}[/tex]
Combining both reaction we have
[tex]4CN^ - + NiS \ \underset{}{\stackrel{}{\rightleftharpoons}} \ Ni(CN)^{2-}_4 + S^{2-}[/tex]
Gnerally the equilibrium constant for this reaction is
[tex]K_c = K_{sp} * K_f[/tex]
=> [tex]K_c = 3.0 *10^{-19 } * 1.0 *10^{31}[/tex]
=> [tex]K_c = 3.0*10^{12}[/tex]
Generally the I C E table for the above reaction is
[tex]4CN^ - \ \ \ + \ \ \ NiS \ \ \ \ \ \ \ \underset{}{\stackrel{}{\rightleftharpoons}} \ \ \ \ \ Ni(CN)^{2-}_4 \ \ \ \ \ \ \ \ \ + \ \ \ \ \ \ \ \ \ S^{2-}[/tex]
initial [ I] 0.091 0 0
Change [C] -4x +x + x
Equilibrium [E ] 0.091 - 4x x x
Here is x is the amount in term of concentration that is lost by [tex]CN^-[/tex] and gained by [tex]Ni(CN)_4 ^{2-}[/tex] and [tex]S^{2-}[/tex]
Gnerally the equilibrium constant for this reaction is mathematically represented as
[tex]K_c = \frac{[Ni (CN)_4^{2-} ] [S^{2-} ] }{ [CN^{-}]^4}[/tex]
=> [tex]3.0*10^{12} = \frac{x * x}{ [0.091 - 4x ]^4}[/tex]
=> [tex]3.0*10^{12}* [0.091 - 4x ]^4 = x^2[/tex]
=> [tex][0.091 - 4x ]^4 = \frac{x^2}{3.0*10^{12}}[/tex]
=> [tex][0.091 - 4x ] = \sqrt[4]{ \frac{x^2}{3.0*10^{12}}}[/tex]
=> [tex][0.091 - 4x ] = \frac{\sqrt{x} }{1316}[/tex]
=> [tex]119.8 - 5264x =\sqrt{x}[/tex]
Square both sides
[tex](119.8 - 5264x)^2 =x[/tex]
=> [tex]14352.04 - 1261255 x + 27709696x^2 = 0[/tex]
=> [tex]27709696x^2 - 1261255 x + 14352.04 = 0[/tex]
Solving using quadratic equation
The value of x is [tex]x = 0.0227 \ M[/tex]
Hence the amount in terms of molarity (concentration) of [tex]Ni(CN)_4 ^{2-}[/tex] and [tex]S^{2-}[/tex] produced at equilibrium is [tex]x = 0.0227 \ M[/tex] it then means that the amount of NiS (nickel(II) sulfide) lost at equilibrium is [tex]x = 0.0227 \ M[/tex]
So the molar solubility of nickel(II) sulfide at equilibrium is
[tex]x = 0.0227 \ M[/tex]
What is the formula for trihydrogen dioxide?
H2O or just water if you need to be simple
Which phrase describes a liquid?
O A. Changing shape and fixed volume
OB. Fixed shape and changing volume
O C. Changing shape and volume
O D. Fixed shape and volume
Answer:
C. Changing shape and volume
Explanation:
If a volume is fixated it can't have free motion/roam like your typical liquid.
A waterfall is an example of:
A.
energy being destroyed.
B.
energy being created.
C.
kinetic energy is converted into potential energy.
D.
potential energy is converted into kinetic energy.
Answer:
D
Explanation:
PE highest at top of waterfall, 0 at bottom, while 0 KE at top and max KE at bottom. PE becomes KE as water falls down the waterfall
When, particles starts moving they gain a kinetic energy. During waterfalls the potential energy is converting to kinetic energy. Hence, option D is correct.
What is kinetic energy?Kinetic energy is a form of energy generated by virtue of the motion of an object. Whereas potential energy is generated by virtue of the position of the object. Potential energy is stored in an object when it is in rest.
Kinetic energy is gained by the movement of particles. When particles starts moving by a force or with the aid of thermal energy, they acquire the energy for displacing from their position where, their potential energy get reduced by moving.
When water is trapped in a dam it is in rest and it have only potential energy. But when it is flowing it have some kinetic energy and if it is falling down, the energy will be higher by the downward force of gravitation and thus gains more kinetic energy. Thus, option D is correct.
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The pH scale for acids and bases ranges from
A. 17
B. 0-14
C. 1-14
D. 1-12
Answer: 0-14
Explanation: Hope this helps
CaSO4.1/2 H2O molecular mass
I don't care but one another time and I have any questions about this email
What could an experimenter use to distingush between a strong acid and a strong base ?
Answer: methyl orange indicator
Explanation: Any indicator is actually suitable since the pH range is very high for strong acid and strong base reaction. You could also use phenolphthalein and methyl red indicator
what happens to energy when sally kicks a soccor ball
Answer:
it is turned into kinetic energy
Explanation:
Answer:
Kinetic energy is transferred from the leg to the soccer ball. or C
Explanation:
Hope this helps