Answer:
No reaction is observed
Explanation:
The activation energy is the minimum energy that reactants must have in order to cross the energy barrier and become converted into products.
When reactant molecules do not possess the required activation energy, collision between the reactant molecules becomes purely elastic and no reaction occurs.
Hence, colliding reactant molecules are only converted into product molecules when they possess the required activation energy.
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)
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
Help meeeeeeeeeeewweeee
Reason:- The Mechanism of Diffusion In the case of food coloring in water, the water is the solvent while the food coloring is the solute. Once they've mixed, they make a solution. Diffusion takes time, though how much time depends on the kinetic energy of the molecules randomly bouncing among each other.
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Answer:
Red
Explanation:
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
Match each term with the appropriate definition.
spectroscopy
the study of the absorption and emission of
light by atoms
absorption spectrum
represents energy absorbed as dark bands
atomic spectrum
represents energy emitted or absorbed
during electron jumps
emission spectrum
represents energy emitted as colored lines
Answer:
Spectroscopy — the study of the absorption and emission of light by atoms
Absorption spectrum — represents energy absorbed as dark bands
Atomic spectrum — represents energy emitted or absorbed
during electron jumps
Emission spectrum — represents energy emitted as colored lines
Explanation:
Spectroscopy is an analytical technique to study and analyze using spectrum. It has been the absorption and emission of other light by the atoms. The correct matches are A.1, B. 2, C.3, and D.4.
What is spectroscopy?Spectroscopy is the technique used in chemistry where matter absorbs and emits radiations of a certain wavelength. The absorption spectrum is used to represent absorbed energy in the form of dark bands or lines. Thus, options A.1 and B.2 are correct.
The atomic spectrum is characterized by the black-colored bands that depict the energy absorbed and emitted by an excited atom during electron transitions. Whereas, the emission spectrum shows the colored lines that is the energy emitted when an electron transits from higher to lower energy levels. Thus, options C.3 and D.4 are 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!
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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.
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How many moles are in 100 grams of gold?
Answer:
0.01 mole
Explanation:
Which of the following is best classified as a compound?
A. Oxygen, because it contains two of same
B. Carbon dioxide, because it contains two different types of atoms
Answer:
The answer is B
Explanation:
Carbon dioxide is a chemical compound that consists of two oxygen atoms and one carbon atom. Carbon Dioxide (CO2) is a gas with a molecular structure composed of two oxygen atoms and one carbon atom.
Hope this helps!
There are 8.6 x 1025 atoms in a block of Tin (Sn). How many moles is the block of Tin?
Answer:
142.8096978mol
Explanation:
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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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
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
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.
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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.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
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!
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]
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I need y’all’s help please
Answer:
6 mass
Explanation:
because the si unit of gram is mass
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
Me podrían decir los nombres comunes de los siguientes hidrocarburos!! URGENTE AYUDA
Answer:
fdhhdhdhdhhshdgdvdvebehbehdhehdhhddhdf
Answer:
No Se Espanol
Explanation:
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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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:
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Answer:
True True False
Explanation:
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
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
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.
Marcus has a mass of 75 kg here on Earth. What would his mass be if he was standing on
the Moon?
Remember, gravity on Earth is 9.8 m/s2 gravity on the moon is 1.6 m/s2.
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Answer:
It is given that the mass of a man is 75 Kg in earth. Then his mass would be same in moon as mass of anything cannot be changed. The weight of the man in earth can be calculated by W=mg=75×9.8=735 N.
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.