Answer:
A. Corn has changed over time due to selective breeding.
Hope this helps :)
In order to control pollution, you should reduce the need for _____________ goods and transportation.
Answer:manufacture
Explanation:
The pollution can be controlled with the help of reducing the need for the manufactured good and transportation.
What is pollution?A pollution can be given as the presence of the harmful substances in the environment. The harmful substances known as pollutants deteriorate the quality of the environment and effect the health of living organism as well.
The pollution in air has been contributed with the increased need of the manufactured goods and transportation, and thereby the reduction will be found to reduce the pollution too.
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You arrive in my class 45 seconds after leaving math which is 90 meters away. How fast did you travel?
Answer:
Speed is 2
Explanation:
Speed = distance ÷ time
90/45=2
Answer: 2
Explanation:
Distance/Time = Speed
3z-1
= 162+2.642-2
4
Z=
the answer is z = 47.214
Answer:
z = 47.214
Hope this helped
What organelle does the process of cellular respiration?
Answer:
Mitochondria
Explanation:
The mitochondrion is the site of cellular respiration. The first part of cellular respiration (glycolysis) happens in the cytoplasm. The second part of cellular respiration needs oxygen, and it occurs in mitochondria.
Complete and balance this neutralization reaction: HNO3 + Al(OH)3
Answer:
Al(OH)3 + HNO3 = Al(NO3)3 + H2O - Chemical Equation Balancer.
Explanation:
sum of all forces acting on object is it a forces, unbalanced forces , balanced forces, net forces
Answer: The answer is Net Forces.
Net force is the vector sum of forces acting on a particle or body.
Have a great day!
Answer:
it is unbalanced force
Explanation:
hope this helps u stay safe
If 23.6 grams of a substance reacts with 42.5 grams of another substance, what would we expect the mass of the products to be after the reaction?
Answer:
The correct answer is 66.1 g
Explanation:
According to Law of Conservation of the Mass, the mass of an isolated system is neither created or destroyed during chemical reactions. It is transformed. So, in a chemical reaction, the atoms of reactants are reoganizated by forming other compounds but the mass is conserved. Thus, the total mass of reactants is always equal to the total mass of products. If 23.6 g of a substance reacts with 42.5 g of another substance, the total mass of the products will be equal to the total mass of reactants:
23.6 g + 42.5 g = 66.1 g reactants = 66.1 g products
Which system produces immune cells?
A. circulatory
B. lymphatic
C. skeletal
D. respiratory
B. i think.
hope i helped! :)
Please help(15 points)
Why aren’t granite, copper, or petroleum found everywhere on Earth’s surface?
Answer: because they take a lot of tie to form
What is the concentration of a 15.0 mL sample of HCl if 28.2 mL of 0.150 M NaOH is needed to reach the equivalence point?
Answer:
0.282 M
Explanation:
Please see the step-by-step solution in the picture attached below.
Hope this answer can help you. Have a nice day!
The concentration of the 15.0 mL sample of HCl is 0.282 M.
To find the concentration of HCl, we can use the concept of stoichiometry and the balanced chemical equation for the reaction between HCl (acid) and NaOH (base):
[tex]HCl + NaOH - > NaCl + H_2O[/tex]
The balanced equation shows a 1:1 mole ratio between HCl and NaOH. Therefore, the moles of HCl that reacted will be equal to the moles of NaOH used at the equivalence point.
First, we find the moles of NaOH used:
Moles of NaOH = Volume (in L) × Concentration
Moles of NaOH = 0.0282 L × 0.150 mol/L = 0.00423 mol
Since the moles of HCl and NaOH are equal, the moles of HCl are also 0.00423 mol.
Now, we calculate the concentration of HCl:
Concentration of HCl = Moles of HCl / Volume (in L)
Concentration of HCl = 0.00423 mol / 0.0150 L = 0.282 M
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Which has more total Heat Energy/
A.) A cup of HOT coffee
B.) A thermos of HOT coffee
C.) They both have the same amount to heat energy
Answer:
The thermos should have more heat energy because of the greater mass.
Leonard adds 5 grams of sugar to 1 liter of water to make one sugar solution. Then he adds 10 grams of sugar to 1 liter of water to make another sugar solution. Which statement correctly compares these solutions?
Answer:
See explanation below
Explanation:
There are many statements and ways to compare both solutions, but the commons one are concentration or molarity, and %m/V.
Both of these statements are valid to compare both solutions, however, molarity is the best to use because with a single number, we can see which solution is more concentrated.
To calculate the molarity of any solution we use the following expression:
M = n/V
n: number of moles of solute.
V: volume of solution in liter.
Now, as the solvent of the solution is water, and the solute is a solid, the volume of solution will be the same volume of the solvent.
The common sugar is the sucrose, and the molecular formula of this is C12H22O11, the molar mass is 342.3 g/mol.
With this, we can calculate the moles:
n = m/MM
n₁ = 5/342.3 = 0.0146 moles
n₂ = 10/342.3 = 0.0292 moles
Now, it's time to see the concentration of each solution:
M₁ = 0.0146 / 1 = 0.0146 M
M₂ = 0.0292 / 1 = 0.0293 M
With this we can conclude that solution 2 is more concentrated than solution 1. In other words M₂ > M₁
What conclusion can you draw from the heating curve?
Answer:A heating curve graphically represents the phase transitions that a substance undergoes as heat is added to it. The plateaus on the curve mark the phase changes. The temperature remains constant during these phase transitions.
need help on this im super lost
Answer:
A
Explanation:
The picture given in the question is very difficult to understand. Please the picture attached below. It may help you more to understand.
..
A potential energy diagram shows the change in potential energy of a system as reactants are converted into products.
Calculate the hyrdrogen ion concentration [h+] for the aquesous solution in which [oh-] is 1 x 10-2 mol/l.Is the solution acidic,basic,or neutral? Show your work
Answer:
- [tex][H^+]=1x10^{-12}[/tex]
- Basic.
Explanation:
Hello,
In this case, given the concentration of hydroxyl ions, one could compute the pOH as shown below:
[tex]pOH=-log([OH^-])=pOH=-log(1x10^{-2})=2[/tex]
Then, since the pOH and the pH are related by:
[tex]pH+pOH=14[/tex]
One computes the pH:
[tex]pH=14-pOH=14-2=12[/tex]
Now, we compute the concentration of hydronium by:
[tex][H^+]=10^{-pH}=10^{-12}[/tex]
[tex][H^+]=1x10^{-12}[/tex]
Finally, since the pH is greater than 7 (neutral point) we conclude that the solution is basic.
Best regards.
Answer:
A. Hydrogen ion concentration, [H+] is 1x10^–12 mol/L
B. Since the pH is 12, the solution is basic.
Explanation:
Data obtained from the question. This includes the following:
Concentration of Hydroxide ion, [OH-] = 1x10^–2 mol/L
Concentration of Hydrogen ion, [H+] =.?
pH =..?
A. Determination of the hydrogen ion concentration, [H+] .
The hydrogen ion concentration, [H+] can be obtained as follow:
[H+] x [OH-] = 1x10^–14
[OH-] = 1x10^–2
[H+] x 1x10^–2 = 1x10^–14
Divide both side by 1x10^–2
[H+] = 1x10^–14 / 1x10^–2
[H+] = 1x10^–12 mol/L
B. Determination of the pH of the solution.
The pH of the solution can be obtained as follow:
pH = –Log [H+]
[H+] = 1x10^–12 mol/L
pH = –Log 1x10^–12
pH = 12.
Then pH of a solution ranges between 0 and 14.
A pH reading between 0 and 6 is termed an acidic solution, a pH reading of 7 is termed a neutral solution and a pH reading between 8 and 14 indicates an alkaline or a basic solution.
The higher the pH value, the more alkaline or basic the solution becomes.
Since the pH is 12, the solution is basic.
A 0.050L solution of Ba(OH)2 is neutralized by 0.072L of a 0.55 M HNO3 solution. What is the concentration of the Ba(OH)2 solution?
Answer:
0.396M
Explanation:
Step 1:
The balanced equation for the reaction. This is given below:
2HNO3 + Ba(OH)2 —> Ba(NO3)2 + 2H2O
From the balanced equation above,
The mole ratio of the acid (nA) = 2
The mole ratio of the base (nB) = 1
Step 2:
Data obtained from the question. This include the following:
Volume of base (Vb) = 0.05L
Concentration of base (Cb) =..?
Volume of acid (Va) = 0.072L
Concentration of acid = 0.55 M
Step 3:
Determination of the concentration of the base, Ba(OH)2.
The concentration of the base, Ba(OH)2 can be obtained as follow:
Cava /CbVb = nA/nB
0.55 x 0.072 / Cb x 0.05 = 2/1
Cross multiply to express in linear form
Cb x 0.05 x 2 = 0.55 x 0.072
Divide both side by 0.05 x 2
Cb = (0.55 x 0.072) / (0.05 x 2)
Cb = 0.396M
Therefore, the concentration of the base, Ba(OH)2 is 0.396M
How is the molar mass of an element different from the atomic mass of an element?
Discribe how an internal combustion engine works. What is drawback to the type of power?
Answer:
An internal combustion engine is a heat engine in which the combustion of a fuel occurs with an oxidizer in a combustion chamber. The force of combustion is converted into mechanical energy through the use of levers and gears. The by products of combustion include energy, water vapor, carbon dioxide (CO2), nitric oxide (NO), nitrogen dioxide (NO2), and carbon monoxide (CO). The two primary drawbacks to the internal combustion engine are the primary energy source is non-renewable (fossil fuels) and the by products can have damaging effects on the environment.
Explanation:
(a) The original value of the reaction quotient, Qc, for the reaction of H2(g) and I2(g) to form HI(g) (before any reactions take place and before equilibrium is established), was 5.56. On the following graph, plot the points representing the initial concentrations of all three gases. Label each point with the formula of the gas.
Answer:
Here's what I get
Explanation:
Assume the initial concentrations of H₂ and I₂ are 0.030 and 0.015 mol·L⁻¹, respectively.
We must calculate the initial concentration of HI.
1. We will need a chemical equation with concentrations, so let's gather all the information in one place.
H₂ + I₂ ⇌ 2HI
I/mol·L⁻¹: 0.30 0.15 x
2. Calculate the concentration of HI
[tex]Q_{\text{c}} = \dfrac{\text{[HI]}^{2}} {\text{[H$_{2}$][I$_{2}$]}} =\dfrac{x^{2}}{0.30 \times 0.15} = 5.56\\\\x^{2} = 0.30 \times 0.15 \times 5.56 = 0.250\\x = \sqrt{0.250} = \textbf{0.50 mol/L}\\\text{The initial concentration of HI is $\large \boxed{\textbf{0.50 mol/L}}$}[/tex]
3. Plot the initial points
The graph below shows the initial concentrations plotted on the vertical axis.
The initial concentration of the HI at the time 0 sec, has been 0.05 mol/L.
The balanced chemical equation for the reaction has been:
[tex]\rm H_2\;+\;I_2\;\rightarrow\;2\;HI[/tex]
The given initial concentration of hydrogen has been 0.030M, and the given concentration of iodine has been 0.015 M.
The reaction quotient for the following reaction has been:
Reaction quotient = [tex]\rm \dfrac{[HI]^2}{[H_2]\;[I_2]}[/tex]
The concentration of HI for the reaction quotient 5.56 has been:
5.56 = [tex]\rm \dfrac{[HI]^2}{[0.030]\;[0.015]}[/tex]
[tex]\rm [HI]^2[/tex] = 0.0025 M
HI = 0.05 mol/L or 0.05 M.
The concentration of the HI at the initial concentration has been 0.05 mol/L.
The graph attached has been plotted as the concentration as the function of time.
The initial concentration of hydrogen, iodine, and hydrogen iodide have been plotted as the function of time.
For more information about the reaction quotient, refer to the link:
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what is the type of bonding for ammonium lauryl sulfate?
Answer:
Hydrogen bonding.
Explanation:
Ammonium lauryl sulfate is also known as ammonium dodecyl sulfate there are two parts in Ammonium lauryl sulfate one is nonpolar hydrocarbon and other part polar sulfate group.
Due to polarity of sulfate group its form hydrogen bond very easily.
It is mainly used as foaming agent the main reason of its use is very much soluble in water and making hydrogen bond with water.
How many atoms of carbon are present in 1.5 mole of carbon.
Answer:
there is one carbon atom and there are two oxygen atoms. So, in total there are three atoms.
Explanation:
which group are most stars found in
Answer:
The White Dwarfs are very hot stars, which are small in size and relatively dim. They are found in the lower left of the H-R Diagram. The Main Sequence is a band of stars, which includes most of the stars, like our Sun. These are usually smaller stars, often dwarf stars.
Explanation:
Answer:
Found along a region called the Main Sequence
Explanation: Main sequence starts vary widely in effective temperatures but the hotter they are the more luminous they are
A radioactive isotope has a half life of 25 minutes. How many half lives have occurred after 175 minutes?
5
6
7
8
Will give Brainliest
Answer:
7
Explanation:
how many number of electrons are in nitrogen and aluminium in their ionic States?
HELPPP. What is the molarity (molar concentration) of a 500.0mL that contains 5.60g of KOH? Please show your work, with units, and include a therefore statement.
Answer:
.2 M
Explanation:
grams/molar mass=ans./volume(L)=molarity
5.6/56=ans./.500=.2 M
- Hope that helps! Please let me know if you need further explanation.
A group of tissues working together is?
Answer:
An organ
Explanation:
An organ is one or more tissues that work together to form a specific function.
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If a strong base, like NaOH, is added to a strong acid, like HCl, the pH of the resultant solution will _________. A.) Go up B.) Go down C.) Stay the same
Answer:
B.) Go down
Explanation:
Hello,
In this case, a strong base like NaOH has a high pH based on the scale wherein 7 is neutral, above 7 is basic and below 7 is acid. In such a way, by adding an acid, having a low pH, once it is added, the pH will go down until the equivalence point, which for strong base and strong acid should be 7.
Best regards.
Answer:
B) Go down
Explanation:
pH is defined as -log [H⁺], that means when concentration of H⁺ increases the pH decreases and when concentration of H⁺ decreases, pH increases.
When a strong acid as HCl is added to a solution, it is dissolved, thus:
HCl → H⁺ + Cl⁻
Thus, addition of a strong acid decreases pH because concentration of H⁺ increases.
Right answer is:
B) Go down
How many moles are there in 135g of aluminum ?
Answer:
The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Aluminium, or 26.981538 grams.
What are many earthquakes intended to do?
Answer:
rapid shaking of the earth, caused by the breaking and shifting of underground rock. Earthquakes can cause buildings to collapse and cause heavy items to fall, resulting in injuries and property damage.
Explanation:
Answer:
They tend to cause mass destruction, even destroy lots of building. I hope this helps you out.
Explanation:
Consider the nuclear equation below. Superscript 222 subscript 86 upper R n right arrow superscript 218 subscript question mark upper P o plus superscript 4 subscript 2 upper H e. Which is the missing value that will balance the equation? 84 86 88 90
Answer:
84
Explanation:
From the question given above, it is evident that 222 86Rn is emitting alpha particle since the daughter nuclei produced has a mass number lesser than 4 when compared to parent element.
Therefore, the miss value in the equation is 84.
Please see attachment for further details
Based on the calculations, the missing value that will balance the equation is: A. 84.
What is an alpha decay?An alpha decay is a type of nuclear reaction in which the atomic nucleus of a radioactive element emits an alpha particle (helium atom), thereby, producing chemical elements with a different atomic nucleus.
In this exercise, we are given the following nuclear equation with an alpha decay:
²²²R₈₆ -----> ²¹⁸Poₓ + ⁴He₂
For the subscript, we have:
86 - 2 = 84.
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