How many mL of 8.00M HCl solution are needed to make a dilution with a final volume of 2,500.ml, and a
concentration of HC-0.333M?
Answer:
104.1 mL
Explanation:
c1V1 = c2V2
V1 = c2V2/c1 = (0.333 M×2500 mL)/8.00 M
V1 = 104.1 mL
Which describes a radioisotope?
A. An isotope of an element that emits radio waves
B. An isotope of an element that is radioactive
O C. An isotope of an element that has a stable nucleus
D. An isotope of an element that is not radioactive
SUBN
Answer:
B.
Explanation:
Radioisotopes are radioactive isotopes of an element. They can also be defined as atoms that contain an unstable combination of neutrons and protons, or excess energy in their nucleus.
A radioisotope describe as,
An isotope of an element that is radioactive.So, option B is correct one.
What is radioisotopes? Radioisotopes are isotopes of an element that is radioactive.An unstable forms of chemical elements that is breaks down into stable element and releases radiationThey can also be defined as atoms that contain an unstable combination of neutrons and protons, or excess energy in their nucleus.The Radioisotopes is used in medicine for treatment.Benefits of radioisotopes .The radioisotopes are used for studies of brain , bone , liver, spleen and kidney imaging.It is also used to locate leaks in the industrial pipe lines.It is also used in nuclear medicals.Learn about Radioisotopes
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If 500.0 mL of olive oil, initially at 25.0°C, receives 1.25 kJ of heat energy, what is its final temperature? (Specific heat olive oil = 2.0 J/g °C, density= 0.19 g/mL)
Answer:
500.00
Explanation:
400+20+50+49+17+59
Hello! Id like if someone could tell me this answer, thank you so much!
Answer:
Option D. ZnCl₂ and H₂
Explanation:
From the question given above, the following equation was obtained:
2HCl + Zn —> ZnCl₂ + H₂
Products =?
In a chemical equation, reactants are located on the left side while products are located on the right side i.e
Reactants —> Products
Now, considering the equation from the question i.e
2HCl + Zn —> ZnCl₂ + H₂
The products are ZnCl₂ and H₂ because from our discussion above, we said that products are only located on the right side of chemical equation.
Thus, option D gives the correct answer to the question.
Joel is studying a certain organ system of the human body. It interacts with the respiratory system to transport oxygen and carbon dioxide gases between the lungs and different parts of the body. It interacts with the digestive system to transport nutrients throughout the body, and it interacts with the urinary system to remove wastes from the body.
What is Joel studying?
A. the nervous system
B. the circulatory system
C. the skeletal system
D. the muscular system
Suppose that a sample of gas occupies 187 mL
of volume at 298 K and a pressure of 277 torr.
What would be the volume (expressed of
this sample) if the pressure were changed to
571 torr at 298 K?
Answer in units of mL.
Answer:
V2 = 90.7 mL
Explanation:
pressure and volume are inversely proportional, if the pressure is increased, the volume will decrease. In an isothermal process:
p1V1 = p2V2
V2 = p1V1/p2 = (277 torr×187 mL)/571 torr
V2 = 90.7 mL
Magnesium hydroxide is an ingredient in some antacids. Antacids react with excess hydrochloric acid in the stomach to relieve
indigestion.
a) balance the reaction that occurs between Mg(OH)2 and HCI.
(select choice) Mg(OH)2 + (select choice) HCI = (select choice) MgCl2 + (blank) H2O
b) what are the mole ratios that would be used to determine the number of moles of MgCl2 produced when HCl reacts with Mg(OH)2.
(blank) mol MgCl2/ (blank) mol Mg(OH)2
(blank) mol MgCl2/ (blank) mol HCI
Answer:
a. 2HCl + 1Mg(OH)2 → 1MgCl2 + 2H2O
b. 1 mol MgCl2/ 1 mol Mg(OH)2
1 mol MgCl2/ 2 mol HCI
Explanation:
a. The reaction of an acid (HCl) with a base (Mg(OH)2) produce water (H2O) and the salt (MgCl2):
_HCl + _Mg(OH)2 → _MgCl2 + _H2O
To balance the Cl:
2HCl + _Mg(OH)2 → _MgCl2 + _H2O
To balance the oxygen:
2HCl + _Mg(OH)2 → _MgCl2 + 2H2O
The reaction is now balanced
2HCl + 1Mg(OH)2 → 1MgCl2 + 2H2O
b. Based on the balanced reaction, the moles ratios are:
1 mol MgCl2/ 1 mol Mg(OH)2
1 mol MgCl2/ 2 mol HCI
How many moles are in 100 grams of gold?
Answer:
0.01 mole
Explanation:
how much potential energy an object has depends on the object
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The rotational axis of the Earth and its magnetic axis are one and the same axis.
Select one:
a. no the two axises are separated by 11.5 degrees and are not one and the same.
B. This is true though the magnetic axis is harder to locate
Answer:
"A"
Explanation:
The magnetic dipole axis of the earth is tilted about 11½° from the rotation axis. This means the magnetic north pole and the geographic north pole are not in the same place. ...
They are also not the sam ehtings :
Magnetic axis is the straight line joining the two poles of a magnet (as the magnetic poles of the earth)
Rotational axis i think is the straight line that joines the north and the south pole of the .earth .... NOTE: The earth is a bit tilted....
look at the daigram for reference.
The rotational axis of the Earth and its magnetic axis are separated by 11.5 degrees and are not one and the same.
What is a rotational axis?The rotational axis is an imaginary line or axis through which any object rotates and revolves.
The angular momentum vector of the object is divided by the angular momentum magnitude to find the rotational axis of an object.
The rotational axis of the earth is 23.5 degrees.
Thus, the correct option is A.
Learn more about the rotational axis
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Answer:
True True False
Explanation:
A 634.5 g sample of helium absorbs 125.7 calories of heat. The specific heat capacity of helium is 1.241 cal/(g·°C). By how much did the temperature of this sample change, in degrees Celsius?
Answer:
[tex]\Delta T=0.160\°C[/tex]
Explanation:
Hello there!
In this case, according to the following equation for the calculation of heat in this calorimetry problem:
[tex]Q=mC\Delta T[/tex]
It is possible for us to calculate to calculate the change in temperature for this process by solving for DT in the aforementioned equation:
[tex]\Delta T=\frac{Q}{mC}\\\\ \Delta T=\frac{125.7cal}{634.5g*1.241 cal/(g\°C)} \\\\ \Delta T=0.160\°C[/tex]
Best regards!
explain why carbon dioxide is a gas, water is a liquid, and salt is solid at room temperature based on how the particals are held together.
Please help I'm having a hard time explaining this.
Answer:
Carbon dioxide is held together by weak intermolecular forces (only London dispersion LD) and is a non-polar molecule. Because of this weak attraction, it exists as a gas. Water on the other hand is polar (dipole forces DP), and has a stronger hydrogen bond existing within it (in addition to LD). This makes it attract itself more than say carbon dioxide molecules, so it commonly exists as a liquid. Finally, salt like water is polar, and has ionic bonds that are even stronger than a hydrogen bond. This makes salt have a great attraction to itself, sticking together as a solid because its molecules cant easily be broken up.
Explanation:
These are the strongest intermolecular forces ranked from strongest to weakest.
1. Network Covalent
2. Ionic
3. Hydrogen Bonding
4. Dipole Dipole
5. London Dispersion
I need y’all’s help please
Answer:
6 mass
Explanation:
because the si unit of gram is mass
A liquid changes color as it cools and becomes solid. How can you confirm
the type of change that took place?
A. Determining that the mass of the solid and liquid are different
would confirm that a chemical change took place.
B. Identifying the solid and liquid as the same substance would
confirm that a physical change took place.
O c. The color change and the formation of a solid confirm that a
chemical change took place.
D. The formation of a solid from a liquid confirms that a physical
change took place.
Answer: Hello, There! your answer is Below.
D. The formation of a solid from a liquid confirms that a physical
change took place.
Explanation:
The change from the liquid state to the solid state is called freezing. As the liquid cools, it loses thermal energy. As a result, its particles slow down and come closer together. Attractive forces begin to trap particles, and the crystals of a solid begin to form.
Hope this helps you!!!
Have a great day!!!
When a liquid undergoes solidification and change of phase it is called freezing. The physical change can be confirmed by changes in the state of matter from liquid to solid. Thus, option D is correct.
What are physical changes?Physical changes are the modification in the matter or object that can be reversed back to its original state. They do not produce substances that are irreversible.
The change of the phase of the matter from liquid to solid when water substance undergoes freezing is a physical change as no new compound is created and the solidified substance can get converted back to liquid.
Therefore, option D. solid from liquid shows a physical change.
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What is the pH of a solution that has a [OH-] = 6.217 x 10-10 M?
The pH of a solution that has a [OH⁻] is 4.8
What is the relation between pH & pOH?Relation between the pH and pOH is shown by the given equation as:
pH + pOH = 14
Given that concentration of OH⁻ ion = 6.217×10⁻¹⁰ M
We know that, pOH = -log[OH⁻]
pOH = -log(6.217×10⁻¹⁰) = 9.2
pH will be calculated as:
pH = 14 - 9.2 = 4.8
Hence value of pH is 4.8.
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When [H+] = 3.33 x 10-7 what is the ph?
Answer:
6.48Explanation:
The pH of a solution can be found by using the formula
[tex]pH = - log ([ {H}^{+} ])[/tex]
From the question we have
[tex]pH = - log(3.33 \times {10}^{ - 7} ) \\ = 6.477555...[/tex]
We have the final answer as
6.48Hope this helps you
How can you tell when a solid substance dissolves in water and does not
react?
A. Gas bubbles form in the water.
B. The substance starts to fizz in the water and gives off an odor.
O C. When the water evaporates, the substance is left behind.
O D. The water changes color and grows warm.
Explanation:
when the water evaporates the substance is left behind
Identifica el elemento según su configuración electrónica, 1s2 2s2 2p6 3s2 3p6 4s2 3d8 *
níquel
hierro
cobalto
cobre
Answer:
nickel is the correct answer
Look at the chemical equation:
Zn + 2HCl → ZnCl2 + H2
How many atoms of hydrogen (H) are present on both sides of the equation?
1
2
3
4
Answer:
B). 2
Explanation:
The atoms of hydrogen (H) present on both sides of the given equation
Zn + 2HCl → ZnCl2 + H2 are 2.
What are atoms ?Atoms are the smallest fundamental unit of particle which can't be destroyed further by any chemical mean.
What is Hydrogen(H) ?Hydrogen is the lightest element in the periodic table having molecular formula(H2) . It is combustible, tasteless, odorless, colorless gas
What is Equation?Equation in chemical science is the way to represent change in the conversion of reactants to product in reaction using symbols given by IUPAC.
The given reaction is
Zn + 2HCl → ZnCl2 + H2
There are two moles produces two moles of hydrogen, hence there are two atoms of hydrogen on both sides.
Hence, there are two atoms of hydrogen(H) are present on both sides of the equation.
Hence, option B is correct.
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HNO3(s) → H+(aq) + NO3(aq)
Which statement about this equation is FALSE?
A. It shows the dissociation of nitric acid.
B. It is a decomposition reaction.
C. It forms anions and cations.
D. The resulting solution does not conduct electricity.
Answer:
D. The resulting solution does not conduct electricity.
Explanation:
Hello there!
In this case, for the given chemical reaction we can say that:
A. it is true because the nitric acid ionizes into hydrogen and nitrate ions
B. it is a decomposition reaction because the acid is partitioned into the composing ions.
C. it is ionized to hydrogen cations and nitrate anions.
D. this is incorrect because nitric acid is a strong electrolyte able to conduct the electricity.
Regards!
A sample of Cd(OH)2 is added to pure water and allowed to come to equilibrium at 25ºC. The concentration of Cd +2 = 1.7 x 10 -5M at equilibrium. Calculate Ksp.
Answer:
[tex]Ksp=2.0x10^{-14}[/tex]
Explanation:
Hello there!
In this case, given the solubilization of cadmium (II) hydroxide:
[tex]Cd(OH)_2(s)\rightleftharpoons Cd^{2+}(aq)+2OH^-(aq)[/tex]
The solubility product can be set up as follows:
[tex]Ksp=[Cd^{2+}][OH^-]^2[/tex]
Now, since we know the concentration of cadmium (II) ions at equilibrium and the mole ratio of these ions to the hydroxide ions is 1:2, we infer that the concentration of the latter at equilibrium is 3.5x10⁻⁵ M. In such a way, the resulting Ksp turns out to be:
[tex]Ksp=(1.7x10^{-5})(3.4x10^{-5})^2\\\\Ksp=2.0x10^{-14}[/tex]
Regards!
Is hydrogen the only non-metal positive ion?
Answer:
Why hydrogen is the only non-metal elements which loses electron to form positive ions ? ... When hydrogen bonded with most electronegative element then it forms a positive ions but when it bonded with less electronegative element then it forms a negative ion.
what is the difference between a substance that low concentration and one high concentration
Answer:
Explained below
Explanation:
First of all we need to know that diffusion is the movement of molecules from a region of higher concentration to a region of lower concentration.
Now, the meaning of a substance having higher concentration or lower concentration is that the amount of solute of a given concentration is higher in the higher concentration region than that in the region of lower concentration.
Please help lol. Please i don’t wanna fail
Answer: A
Explanation:
because it is
.How many moles of NaCl are in 28.0 g?
Answer:
0.48 mols
Explanation:
to convert moles to mass u need to divide mass by the molar mass of NaCl which is 58.44g/mols.
28g ÷ 58.44g/mol = 0.48 mols
Earthquake can produce a sudden vertical change in the seafloor. What can
happen as a result?
O A. Shaking ground
B. Tsunami wave
O C. Pyroclastic flow
D. Sheet erosion
Answer:
Tsunami wave
Explanation:
lol 100% sure
What two types of elements are ionic compounds made of?
Answer:
ionic compounds are made from metal and non mental elements
Explanation:
in this case it is know as an ionic compound because it contains a charge. For example, NaCl is simply a compound as it contains no charges (the charges cancel out as Cl is -1 and Na is +1)
but OH- is an ionic compound as it has a charge if -1 (O has a -2 charge and H has a +1 charge, so -2+1=-1 so OH has -1 charge)
help me pleaseeeee #5
Answer:
Red
Explanation:
the molarity of 8 grams of an aqueous solution of sodium hydroxide in 2 liters of solute is
Answer: The molarity of 8 grams of an aqueous solution of sodium hydroxide in 2 liters of solute is 0.1 M
Explanation:
Given: Mass of solute = 8 g
Volume of solution = 2 L
Molar mass of NaOH is 40 g/mol.
Number of moles of NaOH are calculated as follows.
[tex]No. of moles = \frac{mass}{molar mass}\\= \frac{8 g}{40 g/mol}\\= 0.2 mol[/tex]
As molarity is the number of moles of solute present in a liter of solution. Therefore, molarity of given solution is calculated as follows.
[tex]Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{0.2 mol}{2 L}\\= 0.1 M[/tex]
Thus, we can conclude that the molarity of 8 grams of an aqueous solution of sodium hydroxide in 2 liters of solute is 0.1 M.