Answer:
0.089
Explanation:
n= m/M = 2.5/14 = 5/28 mol
ok done. thank to me :>
what is the answer to this:magnesium+oxygen
Answer:
magnesium oxide
Explanation:
Four substances at the same temperature absorb equal
amounts of energy. The specific heat of the four
substances are listed below.
Substance
A. 1.45 J/g °C
B. 2.32 J/g °C
C. 0.98 J/g °C
D. 1.95 J/g °C
Which substance would show the GREATEST increase in
temperature?
A
B
C
D
Answer:
its that DDDDDD
Explanation:
i know this because its that DDDDDDDD
Why does in the golf stream warm and provide it’s Rhode Island or Bangor Maine
An atom, X, contains 16 protons.
Which statement about Z is correct?Explain why.
A) It cannot form an ion.
B) It contains 6 electrons in the outer shell.
C) It contains 6 neutrons.
D) It had relative atomic mass of 16.
Answer:
B
Explanation: as protons no. = electrons no.= atomic number(Z)
Explain why silver iodide, Agl, a compound used in
photography, has a much higher melting point than
vanillin, C,H,O3, a sweet-smelling compound used
in flavorings.
Answer:
Vanillin consists of molecules. The attraction between particles of silver iodide is stronger than the attraction between particles of vanillin.
The silver iodide a compound used in photography because,
It affected by light.It is easily stick on the surface of photographic plate or film.Why melting point of silver iodide has higher melting point than vanillin?The ionic compound is strong than covalent compound .So, ionic compound require more energy as compare to covalent compound to break their bond between them. So, melting point of ionic compound is higher than covalent compound .Since, silver iodide is ionic compound and vanillin covalent compound.Therefore, melting point of silver iodide is higher than vanillin.learn about melting point,
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What is the energy of a photon emitted when an electron in a hydrogen atom relaxes from an orbital in ni
Answer: Ernest Z. The energy is 1.549×10-19J
Explanation:
How does the microscopic arrangement of particles affect the microscopic behavior of the solution?
Answer:
In a solid, the particles pack together as tightly as possible in a neat and ordered arrangement. ... With an increase in temperature, the particles gain kinetic energy and vibrate faster and more strongly. The attractive force in solids need not be stronger than in liquids or gases
I need uses of acid-base indicators
Answer:
to indicate the presence of acid or base in a body
What is friction? A _______ between an object and the _______ it's moving over.
Answer:
A force between an object and the surface it's moving over.
Explanation:
hope this helps. . . <3
good luck! uωu
as liquid or gases heat up, they ___________. Then as they___________ they fall, thus As liquid or gases heat up, they driving the motion the of convection.
A: Fall, Heat
B: Bubble, Overflow
C: Create Heat, Burn
D: Rise, Cool
Help please its okay if not <3
Answer:
so sorry but I need to randomly answer 2 questions
What is mechanical energy?
The energy that is associated with the motion or position of an object
The energy that travels in waves from the moon
Any energy that travels through a medium like water
The stored energy in a substance like oil or gasoline
Answer:
The energy that is associated with the motion or position of an object
or simply kinetic or potential Energy
Solve the following problems to determine the empirical formula. Show the complete
factors to calculate number of moles, then the molar ration and finally the empirical formula.
1. Calcium bromide is a compound used in photography and the manufactur of fire extinguishing
materials. Analysis of a 20.00 gram sample of calcium bromide yields 4,02 grams of calcium and
15.95 grams of bromine. Calculate the number of moles of both calcium and bromide, then
determine the mole ratio to write an empirical formula for calcium bromide,
The empirical formula of the compound (calcium bromide) is CaBr₂
From the question given above, the following data were obtained:
Ca = 4.02 g
Br = 15.95 g
Empirical formula =?Divide by their molar mass to obtain their mole
Ca = 4.02 / 40 = 0.1005 mole
Br = 15.95 / 80 = 0.199 mole
Divide by the smallest to obtain the mole ratio
Ca = 0.1005 / 0.1005 = 1
Br = 0.199 / 0.1005 = 2
Therefore, the empirical formula of calcium bromide is CaBr₂
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which is a better conductor of eclectic current: a solid ionic compound or a melted ionic compound
Answer:
Melted ionic compounds
Explanation:
This is because the ions have dissociated and for electricity to pass through a substance it is important that the substance must have ions present in it.
can someone plaexplain to me what is 'first ionisation energy' in simple words coz my small brain can't understand it
[tex] \: \: \: \: \: \: [/tex]
the first ionization energy of an element is the energy needed to remove the outermost, or highest energy, electron from a neutral atom in the gas phase.hope it helps[tex] \: \: \: \: \: [/tex]
JWhat type of evidence is gathering information through your senses or using scientific tools?
Predictions
Results
Scientific research
Observations
liquid bromine easily evaporates. explain what happens to the particles when a liquid evaporates
Answer:
they gain enough energy to break away from the bonds that keeps them a liquid
also the particles diffuse away
Explanation:
When liquid bromine evaporate,
Then space or distance between its particle increases.The bromine particles start moving freely when it evoporates .The inter-molecular force of attraction between particles is increases when liquid bromine evaporates.Why liquid bromine easily evaporates?The liquid bromine easily evaporates because of following reasons:
The liquid bromine is more denser then water.Its melting and boiling point is -7°C and 58.9°C.The liquid bromine present in the form liquid at room temperature that is why it is easy evaporates.To learn more about liquid bromine,
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Which objects are scratched?
Answer:
We would need a picture to help you out with this.
Explanation:
what are colloids ?
A solution in which the size of solute particles is intermediate between those in true solution and suspension is called as Colloids.
Answer: A colloid is a mixture in which one substance consisting of microscopically dispersed insoluble particles is suspended throughout another substance.
Hope it helps , have a nice day :>
The
( )state is the lowest possible energy level that an electron can occupy.
When the electron gains energy, it may move to a higher energy level. This is called the( )
state
Answer: ground state
Explanation: The ground state, assuming you’re talking about an electron in an atom. As far as isolated leptons go, the electron is the lowest energy among the electron, muon, and tau particles. Muons and tau particles are unstable. A tau can decay into a muon or electron or other decays, while a muon can decay into an electron and associated neutrinos or gamma rays. Each has a corresponding neutrino, all of which have really, really tiny masses. P.S not copy pasted
Ground state is the lowest possible energy level that an electron can occupy. When the electron gains energy, it may move to a higher energy level. This is called the exited state.
The ground state is the lowest possible energy level that an electron can occupy within an atom. In this state, an electron is in its most stable configuration, meaning it is closest to the nucleus and has the lowest energy level available to it.
When an electron gains energy from an external source, such as absorbing a photon of light or heat, it can move to a higher energy level. This state is known as the excited state. In the excited state, the electron is located farther from the nucleus and possesses more energy than it does in the ground state. The additional energy is stored by the electron as potential energy in its increased distance from the nucleus.
The excited state is temporary. Electrons in an excited state are not stable, and they tend to return to lower energy levels (closer to the nucleus) by releasing the excess energy in the form of photons of light. This phenomenon is the basis for various processes, including fluorescence and emission spectra.
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please help me with this
Answer:
47. C
48. d
49. a
50. b
51. e
52. c
53. c
54. a
55. b
Explanation:
Question 1 (2 points)
Which option can be classified as a pure substance?
Question 1 options:
heterogenous mixture
solution
homogenous mixture
compound
Question 2 (2 points)
Law of conservation of mass states that:
Question 2 options:
matter is destroyed
matter does not change
matter is neither created nor destroyed
matter is created
Question 3 (2 points)
What is a property of bases?
Question 3 options:
all of the above
Sour taste
Slippery touch
Ability to form hydronium ions+
Question 4 (2 points)
Which property do solutions with low pH values have?
What does it mean to have a neutral pH? - Aseptic Health
Question 4 options:
have a -OH group
feels slippery
turns litmus paper blue
tastes sour
Question 5 (2 points)
How do the products of chemical reactions compare to their reactants?
Question 5 options:
The products often have completely different properties than the reactants.
The products are usually more toxic than the reactants.
The products usuallyhave more mass than the reactants.
The products usually have more atoms than the reactants.
Question 6 (2 points)
Which of the following is an example of a physical change?
Question 6 options:
Water freezing into ice.
A piece of wood burning.
A toy car rusting.
Zinc producing hydrogen gas when mixed with water.
Question 7 (2 points)
What might happen if you mixed a strong acid with an equally strong base?
Question 7 options:
You would see an explosive chemical reaction.
The base would destroy the acid.
You'd wind up with a pH-neutral salt and water.
The acid would destroy the base.
Question 8 (2 points)
In the equation shown, what are the reactants?
2H2+O2àH2O
Question 8 options:
Hydrogen and oxygen molecules (2H2 and O2 )
Ice crystals
Hydrogen atoms (H)
Water molecules (H2O)
Question 9 (2 points)
Which phrase most accurately describes a chemical change?
Question 9 options:
A change in form
A change in taste
A change on the molecular level
A change in appearance
Question 10 (2 points)
What does it mean when there is a physical change?
Question 10 options:
A new substance has been formed.
Matter has changed from one substance into a new substance.
Matter has changed size, shape or form
Matter has changed on the molecular level.
help pls ill give 20 points!
Answer:
1) Compound
2) Matter is neither created nor destroyed
3) All of the above
4) Turns litmus paper blue
5) The products often have completely different properties than the reactants.
6) Water freezing into ice
7) You'd wind up with a pH-neutral salt and water.
8) Hydrogen and oxygen molecules (2H2 and O2 )
9) A change on the molecular level
10) Matter has changed size, shape or form
Answer:
compoundmatter is neither created nor destroyedSlippery touchtastes sourThe products often have completely different properties than the reactants. Water freezing into ice. You'd wind up with a pH-neutral salt and water. Hydrogen and oxygen molecules (2H2 and O2 ) A change on the molecular level Matter has changed size, shape or formExplanation:
PLEASE HELP ASAP 30 POINTS!!!!
Voltage ______
Question 1 options:
causes current
pushes free electrons around a circuit
is measured in Volts
all of the choices
what happens when ice changes to water the link up of the atoms
Answer:
Removing heat causes water (a liquid) to freeze to form ice (a solid). When water changes to a solid or a gas, we say it changes to a different state of matter. ... This causes the hydrogen atoms in one water molecule to be attracted to the oxygen atom in another water molecule.
Explanation:
A solid magnesium flare has a mass of 1300 g and a volume of 743 cm3. What is the density of the magnesium?
Answer:
1.74 g/cm3
Explanation:
density=mass/volume
Explanation:
density = 1300/743
or density=1.74g/cm3
A model for a potential chemical reaction is shown here. Evaluate the model and the reaction shown. Which statements are correct about this model. Select ALL that apply.
A) The law of conservation of matter is followed in this model.
B) Conversation of matter is not observed because of some of the atoms are converted into energy in the reaction.
C) Conservation of matter is observed because there are the same number of each atom on both sides of the reaction.
D) Conservation of matter is not observed because there are different numbers of molecules in the reactants and the products.
Answer: b/c
Explanation:
if 15 grams of carbon is present at the beginning of a reaction,how many grams of carbon will be present in the products?
The law of conservation states that the mass of the element remains the same during the course of the reaction.
The law of reaction conformed by the following:-
Mass of reactantMass of productAccording to the question, the amount of carbon is 15g in the reactant and the amount will remain same at the end of reaction, which is product that is 15g.
Hence, the amount remain same in the reaction that is 15g.
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An ion of iron has an 26 protons, 30 neutrons, and 23 electrons. What are its atomic number, atomic mass, and net charge?
Answer:
Atomic number: 26
Atomic mass: 56
Net charge: +3
Explanation:
Which solution has the greatest number of hydrogen ions? blood, pH = 7. 2 lemon juice, pH = 2 soda, pH = 3. 5 bleach, pH = 13. 5.
Answer:
pH=2 soda
Explanation:
There are more H+ ions in more acidic (lower on the pH scale) solutions. There are more H3O+ ions in more basic (higher on the pH scale) solutions.
Hope this helps!
Answer:
b. lemon juice pH=2
Explanation:
Having studied the data for patterns and trends, you should now be able to draw
some conclusions about how knowing the half-life of the element Lokium would
help you determine the absolute age of rock in which this element is found. In a
paragraph, create an imaginary example of finding a given amount of Lokium and
DOL in a rock, and then determining the absolute age of that rock. Assume that
each trial represents 1,000 years
Answer:
The situation given here is imaginary such that the life of Rock has to be found using the half-life of the element lokium that has been found inside the rock.
Half-life of any material is the amount of time taken by that particular material to decay. Now the amount of lokium found in rock can show after how many half-lives this amount has been left out.
The time elapsed will be log (L) atoms X half-life.
Explanation:
(what is the meaning of aids?) (what is the meaning of cushions?) (name 5 citrus fruits) ( what are antibodies?) (what are hormones?)
Answer:
Aids mean
a disease in which there is a severe loss of the body's cellular immunity, greatly lowering the resistance to infection and malignancy.
Cushions mean
a swollen floral system on which several small flowers are borne.
sweet mangogrape fruitpineapplelimelemonWhat are antibodies
this is a blood protein produced in respond to an counteracting a antigen.
What are hormones
these are chemicals that the body releases during a period of time
Explanation: