Which condition will decrease the rate of reaction between excess magnesium and hydrochloric acid?
I. Decreasing temperature
II. Increasing mass of magnesium
III. Increasing the concentration of acid
IV.Using magnesium ribbon instead of power
Answers:
A. I and IV
B. I and III
C. II and III
D. II and IV
Answer:
B
Explanation:
The four factors that increase the rate of the reaction:
1.Concentration of the reactants
2.Size of the particles
3.Temperature
4.Catalyst
7. Which metal is more easily oxidated, copper or aluminum?
Answer:
alumimum
Explanation:
Aluminum oxidation happens faster than that of steel, because aluminum has a really strong affinity for oxygen. Rather than flaking though, aluminum oxide just forms a hard, whitish-colored surface skin. When all the aluminum atoms have bonded with oxygen the oxidation process stops.
hope this answers your question.
Short Essay!
Explain how scientists have used the concept of metallic bonding to account for many of the physical properties of metalssuch as electrical conductivity and malleability .
PLS HELP!!
Answer:
Explanation:
Because electrons are delocalized around positively charged nuclei, metallic bonding explains many properties of metals. Electrical conductivity: Most metals are excellent electrical conductors because the electrons in the electron sea are free to move and carry charge.
Identify the balanced chemical equation that represents a decomposition reaction.
2Fe(OH) 3 ⟶ 2FeO 3 + H 2O
CuSO 4 ⟶ CuO + 2SO 3
2Fe(OH) 3 ⟶ Fe 2O 3 + 3H 2O
P 4 + 3O 2 ⟶ P 2O 3
Identify the balanced chemical equation that represents a decomposition reaction.
2Fe(OH) 3 ⟶ 2FeO 3 + H 2O
CuSO 4 ⟶ CuO + 2SO 3
2Fe(OH) 3 ⟶ Fe 2O 3 + 3H 2OP 4 + 3O 2 ⟶ P 2O 3
Explanation:
Answer:
Option C
Explanation:
A decomposition reaction is a type of reaction in which one reactant breaks down in to two or more products.
Here in option C
On both reactant and products side
Fe=2O=6H=6Hence balanced
Pure N2 in a flask has a pressure of 1.0 atm. If O2 gas is added until the number of molecules of O2 is twice as that of N2. What is the total pressure of the flask
The total pressure of gasses (nitrogen and oxygen) in the flask is determined as 3 atm.
Balanced chemical equation of N2 and O2
The balanced chemical equation of nitrogen gas and oxygen gas is determined as follows;
N₂ + 2O₂ → 2NO₂
PV = nRT
Pressure is directly proportional to number of molesP(total) = P(N₂) + PO₂
P(total) = 1 atm + 2(1 atm)
P(total) = 3 atm
Thus, the total pressure of gasses (nitrogen and oxygen) in the flask is determined as 3 atm.
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Zinc metal is added to hydrochloric acid to generate hydrogen gas and is collected over a liquid whose vapor pressure is the same as that of pure water at 20.0°C (18 torr). The volume of the mixture is 1.7 L, and its total pressure is 0.788 atm. Determine the number of moles of hydrogen gas present in the sample.
Answer:
About 0.054 moles.
Explanation:
Apply the ideal gas law. Recall that:
[tex]\displaystyle PV = n RT[/tex]
Solve for n, the number of moles:
[tex]\displaystyle n = \frac{PV}{RT}[/tex]
Determine the pressure of the hydrogen gas. Recall that by Dalton's Law of Partial Pressures, the total pressure is equal to the sum of the partial pressures of each individual gas:
[tex]\displaystyle P_T = P_\ell + P_\text{H$_2$}[/tex]
Convert the vapor pressure of the liquid to atm (1.00 atm = 760. torr):
[tex]\displaystyle 18\text{ torr} \cdot \frac{1.00\text{ atm}}{760.\text{ torr}} = 0.024\text{ atm}[/tex]
Therefore, the partial pressure of the hydrogen gas is:
[tex]\displaystyle \begin{aligned} P_T & = P_\ell + P_\text{H$_2$} \\ \\ (0.788\text{ atm}) & = (0.024\text{ atm}) + P_\text{H$_2$} \\ \\ P_\text{H$_2$} & = 0.764\text{ atm}\end{aligned}[/tex]
Therefore, the number of moles of hydrogen gas present is (the temperature in kelvins is 273.15 + 20.0 = 293.2 K):
[tex]\displaystyle \begin{aligned} n & = \frac{PV}{RT} \\ \\ & = \frac{(0.764\text{ atm})(1.7\text{ L})}{\left(0.08206 \text{ }\dfrac{\text{L-atm}}{\text{mol-K}}\right)(293.2\text{ K})}\\ \\ & = 0.054\text{ mol H$_2$} \end{aligned}[/tex]
When servers or sellers break state, county, or municipal alcohol laws when serving or selling alcohol, the server or seller
o is not llable; the establishment's owner will de held criminally liable.
o may be fined, but cannot face criminal charges.
will not be fined, but the establishment could lose its liquor license
When servers break state, county, or municipal alcohol laws when serving alcohol, the server could be fined and the establishment could lose its liquor license.
What is Liquor license?This is defined as governmentally issued permit for the service of alcohol in an area over a period of time.
When alcohol law is broken, there may be a fine or the revoking of the liquor license.
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S + 6 HNO3 → H2SO4 + 6 NO2 + 2 H2O
In the above equation, how many grams of water can be made when 19.5 moles of HNO3 are consumed?
Answer:
117 grams H₂O
Explanation:
To find the amount, you need to (1) convert from moles HNO₃ to moles H₂O (via mole-to-mole ratio from equation) and then (2) convert from moles H₂O to grams (via molar mass from periodic table). The final answer should have 3 sig figs according the the given value (19.5).
S + 6 HNO₃ --> H₂SO₄ + 6 NO₂ + 2 H₂O
Molar Mass (H₂O): 15.999 g/mol + 2(1.008 g/mol)
Molar Mass (H₂O): 18.015 g/mol
19.5 moles HNO₃ 2 moles H₂O 18.015 grams
-------------------------- x ---------------------- x ---------------------- = 117 grams H₂O
6 moles HNO₃ 1 mole H₂O
what volume of O2, collected at 22.0C and 0.958 atm would be produced by the decomposition of 8.15g KClo3?
2KClO3(s)-----2KCl(s)+3)2(g)
Answer:
a
Explanation:
Calculate the heat absorbed when 31.6 g of ice at 0°C is completely melted
Latent heat of fusion for ice is 33600J/k
Mass=31.6J/kHeat absorbed
k_f×m31.6×336001061,740mJ1061JSome calcifiers can use bicarbonate (HCO3-) to make their shells.
How will they be affected by the decrease in pH?
Answer:
The removal of this ion from water by the calcifiers will definitely decrease the pH of water.
What is the bicarbonate ion?
The bicarbonate ion is the ion that is designated as HCO3-. We must notice that this ion is present in abundant amounts in the sea. This amount definitely make the sea slightly alkaline.
Now we must note that the removal of this ion from water by the calcifiers that require it to make their shell will definitely decrease the pH of water.
Explanation:
The removal of this ion from water by the calcifiers will definitely decrease the pH of water.
What is the bicarbonate ion?The bicarbonate ion is the ion that is designated as [tex]HCO^{3-}.[/tex] We must notice that this ion is present in abundant amounts in the sea. This amount definitely makes the sea slightly alkaline.
Now we must note that the removal of this ion from water by the calcifiers that require it to make their shell will definitely decrease the pH of water.
Hence, the removal of this ion from water by the calcifiers will definitely decrease the pH of water.
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Aluminum Oxide is formed when aluminum combines with oxygen in the air. How many grams of Al2O3 are formed when 23.6g of Al reacts completely with oxygen?
The amount of [tex]Al_2O_3[/tex] that would be formed will be 44.59 grams
Stoichiometric calculation
From the equation of the reaction:
[tex]4Al + 3O_2 --- > 2Al_2O_3[/tex]
The mole ratio of Al to [tex]Al_2O_3[/tex] is 2:1
Mole of 23.6 g Al = 23.6/26.98 = 0.87 moles
Equivalent mole of [tex]Al_2O_3[/tex] = 0.87/2 = 0.44 moles
Mass of 0.44 mole [tex]Al_2O_3[/tex] = 0.44 x 101.96 = 44.59 grams
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What kind of radioactive element is useful for dating an object?
a. one with a half-life close to the age of the object
b. one that is present in very small amounts
c. one that decays very quickly into a stable form
d. one that does not undergo transmutation
The kind of radioactive element is useful for dating an object is one with a half-life close to the age of the object.
What are radioactive elements?Radioactive elements are elements that involved in radioactivity and this comprises of atoms or particles in their nuclei whose atomic nuclei are not stable and they emit radiations to maintain stability.
Therefore, The kind of radioactive element is useful for dating an object is one with a half-life close to the age of the object.
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Name the following compound:
CH₂-CH-CH₂ - CH₂ - CH3
1
2
CH₂
CH₂
Answer:
methylhexane.
Explanation:
Because thats the answer.
(need help asap)
How much of each reactant(zinc and hydrochloric acid) is needed to produce 150 grams of hydrogen gas
Explanation:
150 grams is .15 liters
1 mole of gas at STP occupies 22.414 liters
.15 liter of hydrogen represents .15/22.414 =
0.0066922 moles of H2
equation is
Zn + 2HCl → ZnCl2 + H2
1 mole of Zn will make 1 mole of H2
0.0066922 moles of Zn will make 0.0066922 moles of H2
To convert this molar quantity of zinc into grams we simply multiply by the atomic mass of zinc, which is
65.38 g/mol;-
Mass of Zn required = 0.0066922 moles * 65.38 g/mol = 0.4375390381 grams
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atomic number of iron
Answer:
The atomic number of Fe which is iron is 26
Explanation:
uranium-235 fission given: energy released = about 200 MeV per individual reaction (mass = 235 amu) find the balanced nuclear reaction
The fission of uranium-235 leads to the equation; 235/92U + 1 neutron → 92/36Kr + 141/56Ba + 3 neutrons + energy.
What is a fission reaction?The term fission reaction refers to the reaction in which a nucleus is bombarded with a particle which causes the nucleus to break down. This leads to the release of energy.
The fission of uranium-235 leads to the equation; 235/92U + 1 neutron → 92/36Kr + 141/56Ba + 3 neutrons + energy.
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A drinking glass and a tightly sealed jar sit on the kitchen counter. both are half-filled with water and are undisturbed for several hours. will the liquid and water vapor establish equilibrium in either container? explain your answer
A tightly sealed jar will form liquid and water equilibrium but the drinking glass will not.
Will the liquid and water vapor establish equilibrium in either container?The liquid and water vapor establish equilibrium in a tightly sealed container but not in the drinking glass because in the tightly sealed jar, the water can't go into the atmosphere but in the drinking glass the water will evaporate.
So we can conclude that a tightly sealed jar will form liquid and water equilibrium but the drinking glass will not.
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A photon of light has a wavelength of 0.050 cm. Calculate its energy.
Answer:
3.96×10^−22J
Explanation:
First find the frequency of the photon from the equation
c=fλ
∴f=c/λ
=3×10⁸m/s / 0.050×10^−2m
=6×10¹¹Hz.
Energy of such photons is quantized and given by
E=hf
=(6.6×10^−34)(6×10¹¹)
=3.96×10^−22J
Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. The energy of photon is 3.96×10⁻²²J.
What is electromagnetic wave?Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave
There is a relation between energy of wave. frequency of wave, and wavelength of wave
Mathematically,
E=hc/λ
where,
E = energy of electromagnetic wave
h is planks constant having value 6.67×10⁻³⁴js
c is speed of light that is 3×10⁸m/s
λ is the wavelength of electromagnetic wave
frequency=speed of light/wavelength
=3×10⁸m/s / 0.050×10⁻²m
=6×10¹¹Hz.
E=h×frequency
=(6.6×10⁻³⁴)(6×10¹¹)
=3.96×10⁻²²J
Therefore, the energy of photon is 3.96×10⁻²²J.
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what do all atoms of any single element have in common
Explain how each property affects the energy in a wave:
Amplitude:
Wave speed:
Wavelength:
Frequency:
Answer:
frequency
Explanation:
because a wave is equally a frequency
What is a physical change?
Answer:
A physical change is when something changes on the inside, but it does not change what it is made of.
An aluminum aerosol can will burst if the pressure inside reaches 210.0 psi. if the can initially contains an ideal gas at 459.5 kpa at 298.15 k, at what temperature (in k) will the can burst?
The can will burst at 938.45 K.
What is Gay Lussac's Law ?Gay Lussac's Law states that the pressure of a fixed amount of gas is directly proportional to the absolute temperature at constant volume.
i.e. P ∝ T
P= KT
P₁ = KT₁
P₂ = KT₂
Here we have considered that the gas is at two different temperatures and pressures which is denoted by T₁ , T₂ and P₁ , P₂
It can also be written as
(P₁ /P₂ ) = (T₁ / T₂)
It is given that
P₂ = 14.29 atm
P₁ = 4.535 atm
T₁ = 298.15 K
T₂ = ?
T₂ = (298.15 * 14.29 )/ 4.54
T₂ = 938.45 K
Therefore the can will burst at 938.45 K.
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Blank measurements are useful for determining buoyancy and identifying relationships between substances.
A. Weight
B. Meniscus
C. Density
(iii) Describe one test for the presence of water
Answer:
Anhydrous copper sulphate.
Explanation:
In the presence of water anhydrous copper sulphate , a white powder, turns to blue.
Which is a cause of chemical weathering?
A) ice
B) wind
C) oxygen
D) gravity
Answer:
The answer is C.
Explanation:
Oxygen- This is also an important cause of chemical weathering.
Density is d= m/vol. If a material has a mass of 65.5 g and a volume of 32.5 ml, it has a density of
Using the given formula, the density of the material is 2.015 g/mL
Calculating DensityFrom the question, we are to determine the density of the material
From the given formula
Density = Mass / Volume
And from the given information,
Mass = 65.5 g
and volume = 32.5 mL
Putting the parameters into the equation,
Density = 65.5/32.5
Density = 2.015 g/mL
Hence, the density of the material is 2.015 g/mL.
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why is the ring around saturn
Answer:
Saturn's rings are made up of ice, dust, rocks, moons and other satellite that orbit the gas giant as its equator, where gravity is strongest.
Explanation:
A student has a sample of 1.33 moles of fluorine gas that is contained in a 23.3 L container at 314 K. What is the pressure of the sample? The ideal gas constant is 0.0821 L*atm/mol*K. Round your answer to the nearest 0.01 and include units.
1.4715 atm is the pressure of the sample 1.33 moles of fluorine gas that is contained in a 23.3 L container at 314 K.
What is an ideal equation?
The ideal gas equation, pV = nRT, is an equation used to calculate either the pressure, volume, temperature or number of moles of a gas. The terms are: p = pressure, in pascals (Pa).
Given data:
Volume (V) = 23.3 L
Number of mole (n) = 1.33 moles
Temperature (T) = 314 K
Gas constant (R) = 0.821 atm.L/Kmol
Pressure (P) =?
The pressure inside the container can be obtained by using the ideal gas equation as illustrated below:
PV = nRT
P × 23.3 L = 1.33 moles × 0.0821 ×314 K
P = 1.4715 atm
Therefore, the pressure of the sample is 1.4715 atm.
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explain how these concepts are related: species, population, and community
Answer:
Organisms that belong to the same species, form groups, and interact together in the same environment make the level of the population whereas a community has groups of different species living together in an environment. Species are the group of individuals that are genetically related to each other.
