Answer:
Zn + H2SO4 ZnSO4 + H2
Explanation:
Start by balancing the equation. This one is already balanced.
(1 zinc, 2 hydrogen, 1 sulfur and, 4 oxygen on each side of the equation).
The mole ratio just refers to the coefficient (the number before each molecule or atom). Since there are no numbers in this equation all coefficients are 1.
Mole ratio = 1:1
Given the [H+] = 3.89x10^-7M, what is the [OH-]?
Answer:
[H][OH] = 10^-7
[OH] = 10^-7/ 3.89x10^-7 = 0.257M
A sample of seawater contains 78.0 grams of NaCl in 2,025 mL of solution. If the molar mass of NaCl is 58.443 g/mol, what is the molarity of this sample?
0.659 M NaCl
0.823 M NaCl
1.84 M NaCl
2.08 M NaCl
Answer:
0.659 M NaCl
Explanation:
Equation: Molarity = moles of solute / liters of solution
1. To find moles of solute:
78.0 g NaCl x 1 mol NaCl / 58.44 g NaCl
= 1.334 mol NaCl
2. Calculate molarity
Transfer 2,025 mL to L
1.334 / 2.025 = 0.659 M NaCl (rounded)
The molarity of the sample of seawater that contains 78.0 grams of NaCl in 2,025 mL of solution is 0.66M.
How to calculate molarity?The molarity of a solution can be calculated by dividing the number of moles by its volume.
However, the number of moles of the substance can be calculated as follows:
no of moles = 78g ÷ 58.443g/mol
no of moles = 1.335mol
molarity = no of moles ÷ volume
molarity = 1.335mol ÷ 2.025L
molarity = 0.66M
Therefore, the molarity of the sample of seawater that contains 78.0 grams of NaCl in 2,025 mL of solution is 0.66M.
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Explain how the percentages of nitrogen , oxygens and carbon dioxide in the earth atmosphere today have changed from the earth
Answer:
See below
Explanation:
The atmosphere of the earth hundreds of millions of years ago was only water vapour and carbon, both from the one ocean that existed around the continental body of Pangea. The photosynthesis process and exache (⊕) caused the percentages to decrease.
1. If you have 200 g of Al2(CO3)3 , how many moles will you have? Show your work.
Answer: There are 0.854 moles of [tex]Al_{2}(CO_{3})_{3}[/tex] present in 200 g of [tex]Al_{2}(CO_{3})_{3}[/tex].
Explanation:
Given: Mass of [tex]Al_{2}(CO_{3})_{3}[/tex] = 200 g
As number of moles is the mass of substance divided by its molar mass.
Molar mass of [tex]Al_{2}(CO_{3})_{3}[/tex] is 233.99 g/mol.
Therefore, moles of [tex]Al_{2}(CO_{3})_{3}[/tex] is calculated as follows.
[tex]No. of moles = \frac{mass}{molar mass}\\= \frac{200 g}{233.99 g/mol}\\= 0.854 mol[/tex]
Thus, we can conclude that there are 0.854 moles of [tex]Al_{2}(CO_{3})_{3}[/tex] present in 200 g of [tex]Al_{2}(CO_{3})_{3}[/tex].
8. What is the chemical equation when calcium chloride combines with water?
Answer:
CaCI2 + H2O = Ca(OH)2 + HCI
Me podrían decir el nombre de los siguientes alcanos ramificados (the name of the following branched alkanes)
Answer:
e)3-etilo-5,6,6-trimetilodecano
If there are 3.0 liters of gas at a pressure of 2.0 atm at constant temperature, what is the pressure if the volume is reduced by one half?
Answer:
The pressure is doubled, 4.0atm
Explanation:
Based on Boyle's law, the pressure of a gas is inversely proportional to its volume at constant temperature. The equation that describes this law is:
P1V1 = P2V2
Where P is pressure and V volume at 1, initial state and 2, final state of the gas.
Computing the values of the problem:
P1 = 2.0atm
V1 = 3.0L
P2 = ?
V2 = 3.0L / 2 = 1.5L
Replacing:
2.0atm*3.0L = P2*1.5L
6.0atmL / 1.5L = P2
4.0atm = P2
The pressure is doubled, 4.0atmWhat effect does the Earth's surface have on solar radiation?
Answer:
Thus, the proportion of Earth's surface that is covered by ice and snow affects how much of the Sun's solar radiation is absorbed, warming the planet, or reflected. Therefore, snow and ice which are covered in soot from pollution no longer reflect sunlight, but absorb it and so melting increases.
Answer:
Half of the solar radiation is absorbed and converted to infrared (heat).
Explanation:
What is the oxidation number of carbon in the compound carbon dioxide, CO2?
A) +3
B)+2
C)-3
D)+4
Answer:
the oxidation number is 4
The specific heat capacities of some metals (in J g−1 K−1) are given below. Copper: 0.385 Magnesium: 1.020 Mercury: 0.138 Platinum: 0.130 If 100 kJ of heat is added to 10.0 g samples of each of the metals above, all at 25°C, determine which metal will have the smallest increase in temperature.
Answer: Magnesium metal will have the smallest increase in temperature.
Explanation:
Given: Specific heats are as follows.
Copper = 0.385 J/g K, Magnesium = 1.020 J/g K
Mercury = 0.138 J/g K, Platinum = 0.130 J/g K
Heat energy = 100 kJ (1 kJ = 1000 J) = 100000 J
mass = 10.0 g
Initial temperature = [tex]25^{o}C[/tex]
Formula used to calculate the increase in temperature for each of the given elements is as follows.
[tex]q = m \times C \times (T_{2} - T_{1})[/tex]
where,
q = heat energy
m = mass
C = specific heat
[tex]T_{1}[/tex] = initial temperature
[tex]T_{2}[/tex] = final temperature
The change in temperature for copper is calculated as follows.[tex]q = m \times C \times (T_{2} - T_{1})\\100000 = 10.0 g \times 0.385 J/g K \times (T_{2} - 25)\\T_{2} = 25999.026^{o}C[/tex]
The change in temperature for magnesium is calculated as follows.[tex]q = m \times C \times (T_{2} - T_{1})\\100000 = 10.0 g \times 1.020 J/g K \times (T_{2} - 25)^{o}C\\T_{2} = 9828.92^{o}C[/tex]
The change in temperature for mercury is calculated as follows.[tex]q = m \times C \times (T_{2} - T_{1})\\100000 = 10.0 g \times 0.138 J/g K \times (T_{2} - 25)^{o}C\\T_{2} = 72488.77^{o}C[/tex]
The change in temperature for platinum is calculated as follows.[tex]q = m \times C \times (T_{2} - T_{1})\\100000 = 10.0 g \times 0.130 J/g K \times (T_{2} - 25)^{o}C\\T_{2} = 76948.08^{o}C[/tex]
Thus, we can conclude that magnesium metal will have the smallest increase in temperature.
Match each chemical reaction with the type of reaction that best describes it
Explanation:
Types of Chemical ReactionCombination Reaction.Decomposition Reaction.Displacement Reaction.Double Displacement Reaction.Oxidation and Reduction Reaction.stay safe healthy and happy.Which galaxy is represented in the
image above?
A. Irregular galaxy
B. Spiral galaxy
C. Elliptical galaxy
D. Electromagnetic galaxy
Answer:
I need to see the galaxy to answer your question
Alternative fuel sources such solar and wind energy are gaining popularity and replacing fossil fuels in many applications. While there are many positive benefits to this technology, what negative impacts do they present?
Answer:
Environmental limitations.
Explanation:
The nonrenewable sources of energy include coal, oil natural gas, and nuclear power. While the renewable source of energy include tidal, solar, geothermal, and wind power. All the sources of nonrenewable energy are called fossil fuels. There are many positives of this alternate energy such as clean and clear energy. Though there may be some negative impacts such as land use changes for setting up solar panels, and windmill farms. These techniques are costly to maintain and implement in all sectors.What is the mass number and atomic number of Ca0
Answer:
56.0774g/mol
Explanation:
hope you like it ☺️
A 5.00 mL sample of hydrochloric acid is titrated with 0.1293 M ammonia (a base). If the titration required 28.15 mL of ammonia, determine the following:
the original concentration of the acid
the original pH of the acid
Answer:
1. C = 0.73 M.
2. pH = 0.14
Explanation:
The reaction is the following:
HCl + NH₃ ⇄ NH₄⁺Cl⁻
From the titration, we can find the number of moles of HCl that were neutralized by the ammonia.
[tex] n_{a} = n_{b} [/tex]
Where "a" is for acid and "b" is for base.
The number of moles is:
[tex] n = C*V [/tex]
Where "C" is for concentration and "V" for volume.
[tex] C_{a}V_{a} = C_{b}V_{b} [/tex]
[tex] C_{a} = \frac{0.1293 M*28.15 mL}{5.00 mL} = 0.73 M [/tex]
Hence the initial concentration of the acid is 0.73 M.
The original pH of the acid is given by:
[tex] pH = -log([H^{+}]) [/tex]
[tex] pH = -log(0.73) = 0.14 [/tex]
Therefore, the original pH of the acid is 0.14.
I hope it helps you!
What is the state of matter involved in a solution and colloid
Explanation:
colloid is a mixture in which one substance of microscopically dispersed insoluble particles are suspended throughout another substance. However, some definitions specify that the particles must be dispersed in a liquid,[1] and others extend the definition to include substances like aerosols and gels. The term colloidal suspension refers unambiguously to the overall mixture (although a narrower sense of the word suspension is distinguished from colloids by larger particle size). A colloid has a dispersed phase (the suspended particles) and a continuous phase (the medium of suspension). The dispersed phase particles have a diameter of approximately 1 nanometre to 1 micrometre.[
hope it helps.
Answer:
colloids are mixtures in which one or more substances are dispersed as relatively large solid particles or liquid droplets throughout a solid ,liquid or gaseous medium .The particles of a colloid remain and do not settle due to gravity ,and they are often electrically charged
hope it helpedHow many molecules of hydrogen gas was produced if
5.0 moles of lead was consumed?
Answer:
3.01×10²⁴ molecules of H₂
Explanation:
Reaction that can produce hydrogen gas from Pb can be this:
Pb + H₂S → PbS + H₂
1 mol of Pb can react to 1 mol of H₂S to produce 1 mol of PbS and 1 mol of H₂
Ratio is always 1:1.
In conclussion 5 moles of lead will produce 5 moles of H₂.
Let's apply the NA to count molecules
1 mol contains 6.02×10²³
Then, 5 moles must contain (5 . 6.02×10²³) = 3.01×10²⁴ molecules
Identify the element that cannot participate in nuclear fission reactions. (Hint: Think about the size of the atom.)
A.
hydrogen
B.
uranium
C.
thorium
D.
plutonium
How many Oxygen atoms are in 2NA(OH)3
Answer:
3 oxygen atom
hope it helps.
Answer:
Explanation:
There are 3 oxygen atoms.
have a nice day!Can you choose me brainliest?
Please help!!!! Best answer will get brainliest
Answer:
covalent network
Explanation:
trust me on this one
What type of reaction occurs when energy is released?
is smoke a compound or a mixture? explain your answer.
Explanation:
hope it is helpful to you ☺️
Complete the sentence. A substance that is more basic has a___pH
than a substance that is acidic. *
the same
higher
lower
none of the above
Answer:
Higher
Explanation:
who is really good with chemistry and can help me with some questions/equations?
Answer:
I can help
Explanation:
(copper is cu) How many copper atoms in 3CuSO,
Answer:
3
Explanation:
because 3CuSO and the 3 in front present how many it has
A cylinder is labeled \"PENTANE.\" When the gas inside the cylinder is monochlorinated, five isomers of formula C5H11Cl result. Was the gas pure n-pentane, pure isopentane, pure neopentane, or a mixture of two or all three of these?
Answer:
a mixture of two these
Explanation:
The number of isomeric monochlorides depends on the structure and number of equivalent hydrogen atoms in each isomer of pentane.
n-pentane has three different kinds of equivalent hydrogen atoms leading to three isomeric monochlorides formed.
Isopentane has four different types of equivalent hydrogen atoms hence four isomeric monochlorides are formed.
Lastly, neopentane has only one type of equivalent hydrogen atoms that yields one mono chlorination product.
Hence the cylinder must contain a mixture of isopentane and neopentane which yields four and one isomeric monochlorides giving a total of five identifiable monochloride products as stated in the question.
3. Designing the caisson…Using technology you think would be available in the late 1800s, what could you do to keep temperatures in the caisson as low as possible? How else can you protect your workers from the dangers of high heat?
Answer:
By using insulating material.
Explanation:
By making the material cover with insulator in that way the we can protect the workers from the dangers of high heat because the insulator are the poor conductor of heat so the heat from the surrounding environment did not enter inside the metal. There are certain materials which remain cool if they receive heat from the surrounding environment so by using these types of materials can be useful on the cover of caisson to reduce heat in the inner side and protect the workers from the dangers of high heat.
9. Thallium-208 has a half-life of 3.053 min. How long will it take for 120 g of it to decay
to 7.5 g?
Answer:
12.213 minutes will be taken for 120 g-Thalium-208 to decay to 75 grams.
Explanation:
Radioactive isotopes decay exponentially in time, the mass of the isotope ([tex]m(t)[/tex]), in grams, is described by the formula in time ([tex]t[/tex]), in minutes:
[tex]m(t) = m_{o}\cdot e^{-\frac{t}{\tau} }[/tex] (1)
Where:
[tex]m_{o}[/tex] - Initial mass of the isotope, in grams.
[tex]\tau[/tex] - Time constant, in minutes.
In addition, the time constant associated with the isotope decay can be described in terms of half-life ([tex]t_{1/2}[/tex]), in minutes:
[tex]\tau = \frac{t_{1/2}}{\ln 2}[/tex] (2)
If we know that [tex]m(t) = 7.5\,g[/tex], [tex]m_{o} = 120\,g[/tex] and [tex]t_{1/2} = 3.053\,min[/tex], then the time taken by the isotope is:
[tex]\tau = \frac{t_{1/2}}{\ln 2}[/tex]
[tex]\tau = \frac{3.053\,min}{\ln 2}[/tex]
[tex]\tau \approx 4.405\,min[/tex]
[tex]t = -\tau \cdot \ln \frac{m(t)}{m_{o}}[/tex]
[tex]t = -(4.405\,min)\cdot \ln \left(\frac{7.5\,g}{120\,g} \right)[/tex]
[tex]t \approx 12.213\,min[/tex]
12.213 minutes will be taken for 120 g-Thalium-208 to decay to 75 grams.
12.21 minutes will it take for 120 g of Thallium-208 to decay
to 7.5 g.
What is half life period?Half life period is that time in which half of the reactant is convert into product.
In the question it is given that,
Initial mass of Thallium-208 = 120g
Final mass after decay = 7.5g
And half life of this decay = 3.053 min
Here we can calculate the total time of decay by the formula : T = t × n.
Where, T = total required time
t = half life
n = no. of half life required to decompose reactant.
120 → 60 →30 → 15 → 7.5
From the above sequence it is clear that we require 4 times of half life to decompose 120g to 7.5g.
So, T = 3.053 × 4 = 12.21 minutes
Hence, 12.21 minutes will it take to decay.
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how many atoms are equal to 1.5 moles of hellium
Answer:
There are 1.8×1024 atoms in 1.5 mol HCl
Explanation:
molecular formula of calcium oxide
Answer:
Calcium oxide, commonly known as lime, is a chemical compound with the formula CaO.