Answer:
3.22
Explanation:
The pOH is defined as:
pOH = - log [OH⁻]
From the problem, we have [OH⁻] = 6.0 x 10⁻⁴.
Thus, we introduce the concentration in the equation to calculate the pOH:
pOH = - log [OH⁻] = -log (6.0 x 10⁻⁴) = 3.22
Which of these is true for a fission reaction?
A. it is an endothermic reaction
B.a heavy nucleus splits into two smaller nuclei
C.two light nuclei combine to form a single heavier nucleus
D.it is an interaction between valence electrons of a atom.
Answer:
Explanation:
The answer is B heavy nucleus splits into two smaller nuclei
calculate the volume occupied by 6.4g of oxygen, 02 at stp?,
Answer:
4.9 L O₂
General Formulas and Concepts:
Atomic Structure
Reading a Periodic TableMolesSTP (Standard Conditions for Temperature and Pressure) = 22.4 L per mole at 1 atm, 273 KStoichiometry
Using Dimensional AnalysisExplanation:
Step 1: Define
Identify variables
[Given] 6.4 g O₂ at STP
[Solve] L O₂
Step 2: Identify Conversions
[STP] 1 mol = 22.4 L
[PT] Molar Mass of O: 16.00 g/mol
Molar Mass of O₂: 2(16.00) = 32.00 g/mol
Step 3: Convert
[DA] Set up: [tex]\displaystyle 6.4 \ g \ O_2(\frac{1 \ mol \ O_2}{32.00 \ g \ O_2})(\frac{22.4 \ L \ O_2}{1 \ mol \ O_2})[/tex][DA] Divide/Multiply [Cancel out units]: [tex]\displaystyle 4.48 \ L \ O_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
4.48 L O₂ ≈ 4.9 L O₂
Al2(SO4)3+Mg(NO3)2⟶ What would be the product(s) of this reaction? *These are NOT balanced, just look for the correct products*
Answer:
[tex]Al_2(SO_4)_3+3Mg(NO_3)_2\rightarrow 2Al(NO_3)_3+3MgSO_4[/tex]
Explanation:
Hello there!
In this case, for the given reactants side, we infer this is a double replacement reaction because all the cations and anions are switched around as a result of the chemical change, we infer that the products side include aluminum with nitrate and magnesium with sulfate as shown below:
[tex]Al_2(SO_4)_3+Mg(NO_3)_2\rightarrow Al(NO_3)_3+MgSO_4[/tex]
However, we need to balance since unequal number of atoms are present at both sides, thus, we do that as shown below:
[tex]Al_2(SO_4)_3+3Mg(NO_3)_2\rightarrow 2Al(NO_3)_3+3MgSO_4[/tex]
Thus, we make 6 Al atoms, 3 S atoms, 3 Mg atoms and 30 O atoms on each side in agreement with the law of conservation of mass.
Regards!
Is this equation right?
Answer:
no
Explanation:
because the characters are invalid
Answer:
no
Explanation:
because they are not valid
Work out the relative formula mass of ammonium nitrate, NH4NO3.
Relative atomic masses: H 1; N 14; O 16.
...........................................................................................................................
...........................................................................................................................
Relative formula mass of ammonium nitrate = ...............................
Answer:
The relative molecular mass of ammonium nitrate is 80 gm
Explanation:
[tex]M_{NH4NO3}[/tex] = 14 + (4 × 1) + 14 + (16 × 3) = 80 (gm)
This gardener started with much smaller plants in this park. Over time, the garden has grown into a large display of brilliant flowers. What would you tell the gardener to explain how the plants have grown and flourished so successfully?
When there is an increase in temperature of a gas in an
enclosed container, the pressure will also increase due to the:
Answer:increase In kinetic energy of molecules
Explanation:increase in kinetic energy of molecules
When there is an increase in temperature of a gas in an enclosed container, the pressure will also increase due to the increase in the kinetic energy.
What is the relation between temperature and pressure?Temperature and pressure of gas is directly proportional to each other.
When the temperature of the gas increases, then the kinetic energy of the gas molecules are also increases. Due to increase in the velocity of gas molecules they will collide with each other as a result of which pressure of the gas is aslo increases.
Hence due to increase in kinetic energy, pressure increases.
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How many atoms are there in 6.8g of S?
Which description is true of earth’s four layers?
Answer:
The astenosphere is located below the lithosphere
The mantle is composed of silicate material
Explanation:
The Earth has several different layers, and they can be presented in two different manners, depending on their chemical composition and their physical properties. According to the chemical composition the Earth has three layers, crust, mantle, and core, while in accordance to the physical properties it has five, lithosphere, astenosphere, mesosphere, outer core, and inner core.
The astenosphere is the second layer from the top, and it lies just below the lithosphere. It is also the upper part of the mantle. The mantle is a layer that is largely composed of silicate material, mostly silicate molten rock. It can easily be seen from the volcanic activities that this layer is composed of silicate material because the magma is rich in it, and the magma comes from this layer.
How much heat is required to raise the temperature of a sample of copper from 0.0°C to 55.0°C, if its specific heat is 0.384 J/g°C and its mass is 10.00 g? Group of answer choices 351.4 2110 211.2 3.54
Answer:
211.2 J
Explanation:
Applying
Q = cm(t₁-t₂)............... Equation 1
Where Q = Amount of heat, c = specific heat capacity of copper, m = mass of copper, t₁ = initial temperature, t₂ = final temperature.
From the question,
Given: c = 0.384 J/g°C, m = 10 g, t₁ = 0°C, t₂ = 55°C
Substitute these value into equation 1
Q = 0.384×10×(55-0)
Q = 0.384×10×55
Q = 211.2 J
A container of oxygen with a volume of 60 L is heated from 300 K to 400 k, What is the new volume?
Answer:
80L
Explanation:
V1/T1 = V2/T2
V2 = V1 T2/T1
T1 = 300K
V1 = 60L
T2 = 400K
V2 = ?
V2 = V1 T2/T1
V2 = (60L)(400K) / (300K)
V2 = 80L
Please Help!! Please, this is due in a couple of minutes, please help
If 8.51×10-2 moles of SO3(g), 0.210 moles of SO2, and 0.354 moles of O2 are at equilibrium in a 15.4 L container at 1.25×103 K, the value of the equilibrium constant, K, is ____
Answer: The value of equilibrium constant, K, is [tex]7.74 \times 10^{-4}[/tex].
Explanation:
The reaction equation is as follows.
[tex]2SO_{3}(g) \rightleftharpoons 2SO_{2}(g) + O_{2}(g)[/tex]
Now, the expression for equilibrium constant of this reaction is as follows.
[tex]K = \frac{[SO_{2}]^{2}[O_{2}]}{[SO_{3}]^{2}}[/tex]
Substitute the given values into above expression as follows.
[tex]K = \frac{[SO_{2}]^{2}[O_{2}]}{[SO_{3}]^{2}}\\= \frac{(\frac{0.210}{15.4})^{2} \times (\frac{0.354}{15.4})}{(\frac{8.51 \times 10^{-2}}{15.4})}\\= 7.74 \times 10^{-4}[/tex]
Thus, we can conclude that the value of equilibrium constant, K, is [tex]7.74 \times 10^{-4}[/tex].
At 15 mph, how long does it take to travel 15 miles?
Answer:
1 hour
Explanation:
Travelling at 15 miles per hour will get take 1 hour to travel 15 miles.
A solution is made by dissolving 4.8 moles of salt in 1.6L of solution. What is the molarity
of the solution?
Answer:
3M
Explanation:
moles ÷ liters = molarity
4.8 ÷ 1.6 = 3M
Many common substances may be classified as acids or bases. Which of
the following statements best describes the materials shown?*
Answer:
Bleach is more basic while human blood is slightly basic
Explanation:
The higher the number on the pH scale, the more basic. Therefore, since bleach's number is higher than the blood, it is more basic.
Which of the following equations is balanced?
A. 2H2 + O2 → 4H2O
B. 4Na + O2 → 2Na2O
C. Fe2O3 + H2 → 2Fe + 3H2O
D. CH4 + O2 → CO2 + H2O
Answer:
B. 4Na + O2 → 2Na2O
Explanation:
Got it right on the test :)
For balanced equation the mass of reactant is exactly equal to the mass of product. atoms of reactant equal to the atoms of product is called as balanced equation.
What is balanced equation ?
The law of conservation of mass, which states that "the total mass of all the products of reaction in a chemical reaction is equal to the total mass of all the reactants," is satisfied by balancing chemical equations.
A balanced chemical equation, in which the masses of the reactants and products are equal, contains the same amount of atoms of each element on both sides of the equation.
4Na + O₂ ⇒ 2Na₂O₂
In this reaction in reactant there are four number of sodium atom and in product also four number of sodium atom. Similarly total number of oxygen at reactant is equal to the total number of oxygen at product.
Thus, option B is correct.
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44.0L of O2 react with excess Sulfur dioxide gas. All gases are kept at the same temperature, pressure, and volume. What will be the theoretical yield of Sulfur trioxide gas in Liters?
Answer:
The theoretical yield of sulfur trioxide is 88.0 Litres
Explanation:
The chemical reaction occurring between oxygen and sulfur dioxide is given in the chemical equation below :
2SO₂ + O₂ ----> 2SO₃
From the equation of reaction, 2 moles of sulfur dioxide reacts with 1 mole of oxygen to produce 2 moles of sulfur trioxide.
Volume of 1 mole of a gas at STP is 22.4 L
Number of moles of gas in 44.0 L = 44.0/22.4 moles
1 mole of oxygen reacts with 2 moles sulfur dioxide to produce 2 moles of sulfur trioxide;
44/22.4 moles of oxygen will react with excess sulfur dioxide to produce 2 × 44/22.4 moles of sulfur trioxide = 88/22.4 moles of sulfur trioxide
88/22.4 moles of sulfur trioxide will have a volume of 88/22.4 × 22.4 Litres = 88.0 Litres
Therefore, the theoretical yield of sulfur trioxide is 88.0 Litres
A gas has a volume of 25 ml, at a pressure of 1 atmosphere (1 atm). Increase the volume to 125 ml and the temperature remains constant. What is the new pressure? please help
Explanation:
The new pressure can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2 \\[/tex]
Since we're finding the new pressure
[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]
We have
[tex]P_2 = \frac{25 \times 1}{125} = \frac{25}{125} = \frac{1}{5} = 0.2 \\ [/tex]
We have the final answer as
0.2 atmHope this helps you
Three students measured the volumes of a pebble whose accepted volume is 2.71 cm3. Which list represents both accurate and precise:
A: 2.60 mL, 2.60 mL, 2.59 mL, 2.59 mL
B: 2.70 mL, 2.69 mL, 2.71 mL, 270 mL
C: 2.75 mL, 2.74 mL, 2.64 mL, 2.71 mL
D: A and B
Answer:
C
Explanation:
What is the mole to mole ratio of oxygen to water for the equation below?
C7H16 + 11 O2 -> 7 CO2 + 8 H2O
a. 11:8
b. 8:11
c. 1:11
d. 11:1
Answer:
A
Explanation:
because
O2 : H2O
11 : 8
hope this helps:)
The mole to mole ratio of oxygen to water for the chemical equation given is 11:8.
What is a mole?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.
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Please and thank you in advance. Due today
Answer:
Sorry I really don't know but can you help with one of my question I posted please thanks.
Which example in the video is a physical change?
A) Burning steel wool
B) Mixing chemicals
C) Rusting nail
D) Melting ice cream
D melting ice cream because if u know what a physical change is its a change that you can reverse chimical change are changes you cant reverse so u can freeze back ice cream so :D
Fullerenes (like the one shown) are made up of hexagonal rings of carbon atoms (like in graphite or graphene) and alternating pentagonal and heptagonal carbon rings to allow curvature of the surface producing molecules that have a complete hollow shape.
The extremely small diameter of the nanoparticle fullerenes (which act like a cage) allows them to readily pass through cell membranes and be readily absorbed into the body.
What potential benefit does this have in the pharmaceutical industry as well as medicine?
A)
The very small fullerene molecules would keep cancer cells from invading other healthy cells. As a result, it would keep cancer from spreading.
B)
The very small fullerene molecules could allow surgeons to see the insides of cells with tiny cameras as they perform complex surgery.
C)
The very small fullerene molecules could obstruct hazardous chemicals from getting into absorbed into cells.
D)
The very small fullerene molecules could easily deliver drugs directly into cells in a highly controlled manner.
Answer:
Your answer choice is D
Explanation:
I just got it right on USATestprep :))
Chemistry help!
Zoom in to see better!!
Answer:
2.5 moles of Al
Explanation:
We'll begin by calculating the number of mole in 127 g of Al₂O₃. This can be obtained as follow:
Mass of Al₂O₃ = 127 g
Molar mass of Al₂O₃ = 101.961 g/mol
Mole of Al₂O₃ =?
Mole = mass / molar mass
Mole of Al₂O₃ = 127 / 101.961
Mole of Al₂O₃ = 1.25 mole
Finally, we shall determine the number of mole of Al that reacted. This can be obtained as follow:
4Al + 3O₂ —> 2Al₂O₃
From the balanced equation above,
4 moles of Al reacted to produce 2 moles of Al₂O₃.
Therefore, Xmol of Al will react to produce 1.25 moles of Al₂O₃ i.e
Xmol of Al = (1.25 × 4)/2
Xmol of Al = 2.5 moles.
Thus, 2.5 moles of Al is needed for the reaction.
Why is carbon dioxide a covalent bond?
Explanation:
One atom of carbon (2.4) combines with two atoms of oxygen (2.6) to form the compound carbon dioxide CO2 (only the outer shell of carbon's electrons are shown). ... The carbon dioxide molecule is held together by the strong C=O. carbon–oxygen double covalent bonds by sharing electrons.
A volume of 3.0 L of air is warmed from 50 degrees celsius to 100 degrees celsius. What is the new volume if the pressure remains constant?
Answer:
3.45 L
Explanation:
Temperature and volume are linearly related (when one increases or decreases, so does the other).
Convert the temperature to Kelvin:
50 °C = 323 K
100 °C = 373 K
To find the rate of change, divide 373 by 323 to get roughly 1.15
Multiply the amount of liters by this factor to get your answer
Find the pH of a solution with a [H+] of 0.045M.
Answer:
1.35Explanation:
The pH of a solution can be found by using the formula
[tex]pH = - log ([ {H}^{+} ])[/tex]
From the question
[H+] = 0.045 M
We have
[tex]pH = - log(0.045) \\ = 1.346787...[/tex]
We have the final answer as
1.35Hope this helps you
Answer:
1.35
Explanation:
After a hurricane, plant A began to do poorly and plant B began to thrive. After several large rainstorms, plant A began to thrive and plant B began to do poorly. What hypothesis is best supported by this information?
Answer:Plant A does best in high salinity water and soil, and plant B does best in low salinity water and soil.
Explanation: Because plant A in a hurricane dost bad bot Plant B doest well
Answer:
Plant A does best in high salinity water and soil, and plant B does best in low salinity water and soil
Explanation:
This is due to hurricanes decreasing salinity of water while Rainstorms increase salinity.
Gases at high temperatures and low pressures behave like ideal gases. True or False?
Answer:
Very true
Explanation:
less energy was entering Earth's
2. When more energy enters than exits the Earth system, what happens to temperatures on Earth?
(select one)
The temperatures on Earth increase
The temperatures on Earth decrease
The temperatures on Earth do not change
「ロロロ
Answer:
The temperatures on Earth increase
Explanation:
more energy results in more heat.