Which statement best describes what happens to the carbon dioxide produced by humans?.
what is chemical formula of benzaldehyde?
Answer:
the chemical formula of benzaldehyde is C₇H₆O
3. Which of the following statements is true?
a. A lithium ion has a 1+charge because it gained
one electron.
b. A magnesium ion has a 2-charge because it
lost two electrons.
c. A sulfide ion has a 2-charge because it gained
two electrons.
d. A chloride ion has a 1+ charge because it gained
one electron.
e. An aluminum ion has a 3-charge because it lost
three electrons.
c. A sulfide ion has 2- charge because it gaines two electrons
thia statement is true.
The half-life of cobalt-60 is 5 years. How old is a sample of cobalt-60 if only one-eighth of the original sample is still cobalt-60?.
[tex]\tt \large{\boxed{\bold{Nt=No.(\frac{1}{2}) ^{\frac{T}{t1/2} } }}[/tex]
Nt/No = 1/8
T = duration of decay
t 1/2 = half-life
[tex]\tt \dfrac{1}{8}=\dfrac{1}{2}^\dfrac{T}{5}}\\\\(\dfrac{1}{2})^3=\dfrac{1}{2}^\dfrac{T}{5}}\\\\3=\dfrac{T}{5}\rightarrow T=15~years[/tex]
Calculate the number of atoms in 5 moles H₂O.
Answer:
90.35 × 10²³ atoms
Solution:
1 molecules of H20 contains 3 atoms,.
And we know that one mole of any molecule contains 6.023 × 10²³ atoms from Avogadro's number,
hence 5 moles of H20 will contain = 5× 6.023 × 10²³ × 3 atoms = 90.35 × 10²³ atoms!
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The balanced equation for the aerobic reaction is:
Zn + 2 HCl → ZnCl2 + H2
How much hydrogen gas is produced from 5 g of HCl?
Please show work and be detailed.
Answer:
1.85 g of hydrogen gas will form!
Explanation:
1. Write the balanced equation.
Zn
+
2HCl
→
ZnCl
2
+
H
2
2. Calculate the moles of
Zn
.
Moles of Zn
=
30.0
g Zn
×
1 mol Zn
65.38
g Zn
=
0.4589 mol Zn
3. Calculate the moles of
H
2
.
Moles of H
2
=
0.4589
mol Zn
×
2 mol H
2
1
mol Zn
=
0.9177 mol H
2
4. Calculate the mass of
H
2
.
Mass of H
2
=
0.9177
mol H
2
×
2.016 g H
2
1
mol H
2
=
1.85 g H
2
Why is most space exploration
accomplished with spacecraft that do not have
crews on board?
Answer:
why is most space exploration accomplished with spacecraft that do not have crews on board? humans face many challenges in space. what is one advantage of using an orbiter to study objects in space? can be used for long periods of time.
Can grasshoppers fly?
Answer:
Yes, because they have strong wings..
After some wood has completely burned in a fire some of the matter that made up the wood has been destroyed
Answer:
Because it went through a chemical change which changes its atomic form
Draw the structure of the organic product formed by heating succinic acid.
The product of heating succinic acid is succinic anhydride, which is a structure with four carbon atoms, four hydrogen atoms, and three oxygen atoms.
What happens if you heat succinic acid?If succinic acid is heated the initial reactant (succinic acid) releases water, which changes the identity of the substance as succinic acid becomes succinic anhydride.
How to draw the product of this reaction?Draw the formula of the product which is C4H4O3.Using the formula draw the structure.Learn more about chemical reactions in: https://brainly.com/question/22817140
What is the density of a substance with a mass of 20.0 g and a volume of 4.0 mL?
Answer:
20÷4=5g/ml, bcz it is in mL but in other situations you will need to convert it to L by dividing it by 1000
Mass= 20.0g
Volume= 4.0mL
To Find,Density of substance
We Know,[tex]\text{Density} = \frac {\text{Mass}}{ \text{Volume}}[/tex]
Inserting The Values[tex] \text{Density} = \frac{20.0 \text{ \: g}}{4.0 \: \text{mL}} \\ \\ \text{Density} = \frac{ \cancel{20.0}\text{ \: g}}{ \cancel{4.0} \: \text{mL}} \\ \\ \text{Density} = 5.0 \: \text{g/mL}[/tex]
[tex]\therefore \text{Option B}= 5.0 \: \text{g/mL is the correct answer}[/tex]
Hope this helpsWhat role does sulfuric acid play in the fischer esterification?.
Answer:
It plays the role of a catalyst.
The second-order rate constant for the decomposition of NO2 (to NO and O2) at 573 K is 0.54 M-1 s-1. Calculate the time for an initial NO2 concentration of 0.20 mol/L to decrease to a) one-half; b) one-sixteenth; c) one-ninth of its initial concentration.
The rate of second order reaction depends on the change in the concentration of the reactants.
Second order reaction:A second order reaction is one in which the rate of reaction depends on the concentration of reactants.
For a second order reaction;
1/[A] = kt + 1/[A]o
When concentration deceresases to one-half;
1/0.1 = 0.54t + 1/0.20
1/0.1 - 1/0.20 = 0.54t
10 - 5/0.54 = t
t = 9.3 s
When concentration deceresases to one-sixteenth;
1/0.0125 = 0.54t + 1/0.20
1/0.0125 - 1/0.20 = 0.54t
80 - 5 = 0.54t
t = 80 - 5/0.54
t = 149 s
When concentration deceresases to one-ninth;
1/0.022 = 0.54t + 1/0.20
1/0.022 - 1/0.20 = 0.54t
45 - 5 = 0.54t
t = 45 - 5/0.54
t = 74 s
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What is a trade-off?
Don't mind the highlighted yellow circle
Answer:
a new scientific discovery that benefits the environment
what are the hydrogen ion and hydroxide ion concentrations in water? what is the pH and pOH of pure water?
Answer:
The pH of pure water is 7, the negative logarithm of 1 X 10-7. A neutral solution is one that is neither acidic nor basic. The hydrogen ion concentration equals the hydroxide ion concentration, and both equal 1 X 10-7 M. In a neutral solution, then, pH = pOH = 7.
Explanation:
The hydrogen ion concentration equals the hydroxide ion concentration, and both equal to [tex]1 X 10^{-7}[/tex] M. Hence, in a neutral solution, then, pH = pOH = 7.
What is pH?pH is a quantitative measure of the acidity or basicity of aqueous or other liquid solutions.
pOH is calculated by taking negative logarithm of hydroxide ion concentration.
The pH of pure water is 7, the negative logarithm of [tex]1 X 10^{-7}.[/tex]
A neutral solution is one that is neither acidic nor basic.
The hydrogen ion concentration equals the hydroxide ion concentration, and both are equal to [tex]1 X 10^{-7}[/tex] M.
Hence, in a neutral solution, then, pH = pOH = 7.
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Identify the products of this single-replacement reaction between sulfuric acid and aluminum. Then balance the equation. (2 points)
___H₂SO₄ + ___Al → ___ + ___
The products of this reaction between aluminum and sulfuric acid are two: hydrogen and aluminum sulfate.
What are the products in a reaction?This concept refers to the substances obtained at the end of the reaction.
What does it mean to balance an equation?It means to make sure there are the same molecules in the reactants and products.
What are the products in this reaction?Al + H2SO4 = Al2 (SO4)3 + H2 Al2 (SO4)3 = Aluminium sulfateH = HydrogenWhat is the balanced equation?2Al + 3H2SO4 = Al2 (SO4)3 + 3H2
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7.25 moles of air are pumped into a car tire. At 80°C, the pressure inside the tire is 506.625
kPa. What is the volume of the tire?
NEED IT ASAP!PLEASE HURRY
Answer:
snow, or freezing rain?
Explanation:
because freezing rain can occur then, but snow is more common.
Predict the species that will be reduced first if a mixture of molten salts containing the following ions undergoes electrolysis:
Zn2+, Mn2+, Na+, Al3+, Li+
Hint! You may need to consult the table of Standard Reduction Potential on the data sheet.
Answer: Zn2+
Explanation:
The standard reduction potential of the given species is as follows:-
[tex]\begin{aligned}&Z_{(aq)}^{2+}+2 e^{-} \longrightarrow {Zn}(\mathrm{s}) \quad E^{\circ}=-0.76 \mathrm{~V}\\&\mathrm{Mn}_{(\text {aq) }}^{2+}+2 e^{-} \longrightarrow \mathrm{Mn}(\mathrm{s}) \quad E^{\circ} = -1.03 \mathrm{~V}\\&\mathrm{Na}^{+}_{(\text {aq) }} + e^{-} \longrightarrow \mathrm{Na}\text{(s)} \quad E^{\circ}=-2.71 \mathrm{~V}\end{aligned}[/tex]
[tex]\begin{aligned}&\mathrm{Al}_{(\text {aq) }}^{3+}+3 e^{-} \longrightarrow \text {Al}\text{(s)}\quad E^{0}=-1.66 \mathrm{~V}\\&\mathrm{Li}^{+}(aq)+{e}^{-} \longrightarrow \mathrm{Li}\text{(s)} \quad E^{0}=-3.05 \mathrm{~V}\end{aligned}[/tex]
In the electrochemical series, the species having the lowest electromotive force—the lowest negative value—will be reduced first and the species having the highest negative value will be reduced last
Therefore, Zn2+ will be reduced first and Li+ will be reduced last
The reduction has been defined as the loss of electrons. The species of molten salt that reduces first has been zinc ion in electrolysis.
What is electrolysis?The electrolysis has been defined as the process of the ionization of the salt under the influence of the electric field.
The species with the lowest reduction potential will reduce first. The reduction potential of the following is:
Zinc ion = -0.76 VManganese ion = -1.03 VSodium ion = -2.71 VAluminum ion = -1.66 VLithium-ion = -3.05 VZinc has the lowest reduction potential and thus is the reduced first among the others.
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40 points please help me very easy!
Answer:
it is charles's law
Explanation:
volume does matter with pressure
What type of galaxy is most common?
Elliptical
Irregular
Lens
Spiral
what determines the boundaries of a water shed
The boundary of a watershed is defined by the highest elevations surrounding a lake or river segment. A drop of water falling outside of the boundary will drain to another watershed.
Answer:
The boundary of a watershed is defined by the highest elevations surrounding a lake or river segment. A drop of water falling outside of the boundary will drain to another watershed.
Explanation:
WE DO: The mechanism shown here is proposed for the reaction:
2A → 2B + C
2A k1↔ B + D (Fast, equilibrium)
B + D k-1→ E + C (Slow)
E → 2B (Fast)
Propose a rate law consistent with the mechanism.
Please show and explain everything.
Based on the mechanism shown above, the correct rate law that is consistent with the sample reaction is [tex]B+D \rightarrow ^{k_{-1}} E+C[/tex].
What is the rate law?Rate law can be defined as a chemical equation that is used to relate the initial (forward) chemical reaction rate with respect to the concentrations of both the chemical reactants and constant parameters.
Mathematically, the rate law is given by this formula:
[tex]R = K[A]^x[B]^y[C]^z[/tex]
Where:
k is the rate constant.A is the concentration of reactant A.B is the concentration of reactant B.C is the concentration of reactant C.x, y, and z are the order of the reaction.Based on the mechanism shown above, the correct rate law that is consistent with the sample reaction is as follows:
[tex]B+D \rightarrow ^{k_{-1}} E+C[/tex]
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At a temperature of 273K, a 400 mL gas sample has a pressure of 760 mm Hg. If the pressure is changed to 380 mmHg, at which temperature will this gas have a volume of 551mL?
Answer: The correct answer is 188.03K.
Explanation:
As a result, the gas sample will have a volume of 551mL at a temperature of 188.03K.
What is the name of the molecule shown below?
A.2-octene is the name of the molecule shown below.
How many carbons does 2-octene have?The oct part of the name indicates the parent chain. In this case, oct- is an abbreviation for octane, which means that there are 8 carbons in the parent chain. The first part of the name, cis-2. 2 is used to indicate the first atom that forms the double bond above.
Alkenes are classified into higher olefins and alpha olefins. This means that the double bond is in the alpha (primary) position, which makes the compound more reactive and provides useful chemistry.
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A sample of iron having a mass of 93.3 g is heated to 65.58 oC and is placed in 75.0 g of water raising the temperature of the water from 16.95 o C to 22.24 o C. Find the specific heat capacity for this iron sample. (Specific Heat of Water (C) = 4.184 J/go C)
Answer:
0.271J/g°C
Explanation:
mass of iron=93.3g
∆°C=65.58
mass of water=75g
C of water=4.184
∆°C=22.4-16.95=5.29°C
mc∆°C of iron = mc∆°C of water
93.3×C×5.29=75×4.184×5.29
C=75×4.185×5.29/93.3×65.58
C=0.271J/g°C
Work out the specific heat capacity of each metal from the data given:
Gold- the temperature of 2.00g of gold is raised by 11.7°C when 3.00J of energy is supplied
Answer:
C) Solar Energy, i,e, Energy that comes from the sun
Ferrous ammonium sulfate is what kind of test method.
A FAS-DPD titration is as simple as a test for total alkalinity or calcium hardness. A buffered DPD indicator powder is added to a water sample and reacts with chlorine to produce the pink color characteristic of the standard DPD test.
In which method ferric ammonium sulphate is used as an indicator?
Chemical analysis is the name of the method when ferric ammonium sulphate is used as the indicator. Basically, this method is used in the making of pharma elements. It is used in standardizing the formulation.
What is a DPD test?
The DPD test is used extensively in water treatment to determine the level of disinfectant present. In most cases, this is Free Chlorine but it can be used to measure other parameters ( oxidants ). It is a quick and relatively easy test which requires little background or skill to perform.
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Elaborate on the method used to extinguish each class of fire
Pls help with question 10
Answer:
Formula/Molecular Mass = 147.77415g/mol = 148g/mol (to 3 significant figures)
Explanation:
Given the Law of the Conservation of Mass, the amount of H2O produced will be equal to 10.00g-4.40g = 5.6g
Given equation n=m/M ,
n(H2O)= 5.6/ (1.008×2)+(15.999) = 0.318520677 moles
∴ x=0.318520677 moles
∴ Molecular mass (hydrated sodium sulfate) =
= (22.990×2)+(32.06)+(15.999×4)+[0.318...((1.008×2)+(15.999))]
= 147.77415g/mol
Answer:
Answer is in the attachment:
x=10
Explanation:
