Answer:
3). 1.30 × 10^(24) molecules
Explanation:
From avogadro's law which state that equal volume of all gases at the same temperature and pressure contain the same number of molecules.
We can relate it to this question as;
V₁/n₁ = V₂/n₂
Where;
V₁ is initial volume
n₁ is initial number of molecules
V₂ is final volume
n₂ is final number of molecules
Thus at STP, we have V₁ = V₂ and as such Plugging in the relevant values gives;
5/(1.30 x 10^(24)) = 5/n₂
n₂ = 1.30 x 10^(24) molecules
Answer:
1.30 X 1024 molecules
Explanation:
just took the test :D
have a miraculous day!!! <3
GIVE ME ANSWERS
i will give you a brain list
Part II: Fill in the Blank-Complete each sentence; you may put more than one word in a
blank.
9. _____________ have a mass number of 0.
10. Particles found in the nucleus are called ______________________.
11. _____________________________ is when electrons are released by a hot filament.
12. The number of protons and neutrons in an element is called the _______________ number.
13. ____________________ was the first atomic bomb dropped.
14. _________________ would be an example of a spontaneous change to the nucleus.
15. _____________ decay results in the release of two protons and two neutrons.
16. __________________ are particles that would be attracted to a positively charged plate.
17. __________________________ coined the word radioactivity.
18. ____________________________________ is used to produced radioactive isotopes by
forcing nuclear reactions.
19. During __________________, the nucleus of a Uranium 235 atom is split into lighter
elements, neutrons, and energy.
20. _________________ are the fastest form of radiation.
21. The number of protons in an element is called the _______________ number.
22. Irene Curie used ___________________ as the source of alpha particles for her research.
23. Uranium goes through _____________ decay ____________ (a number) times to produce
Plutonium.
24. ________________ is a raw Uranium ore which was central to the discovery of radioactivity.
25. The ____________________ was cited in the letter signed by Einstein as having ore with
high concentrations of U-235.
Answer:
uh.. How many do you want done??
Explanation:
Balance the chemical equation. Based on the equation, how many grams of bromine are produced by the complete reaction of 11 grams of potassium bromide? Use the periodic table to get the weights of the elements. Carry out your calcuation in the same way as you did in parts A, B, and C. That is, begin by converting grams of KBr to moles of KBr, then use the mole ratio of KBr to Br2.
Answer:
Explanation:
The balanced chemical equation is Cl2 + 2KBr → 2KCl + Br2. The amount of bromine is calculated as follows:
11.0 g KBr (1mol KBr/119.002g KBr * 1mol Br2/2mol KBr * 159.808g Br2/1mol Br2= 7.39 g Br2.)
The balanced chemical equation is Cl₂ + 2 KBr → 2 KCl + Br₂.7.39 g of bromine are produced by the complete reaction of 11 grams of potassium bromide.
What is chemical equation?The Chemical equation is a symbolic representation of a chemical reaction is written in form of symbols and chemical formulas.The reactants are present on the left hand side while the products are written on the right hand side of the chemical equation.
A plus sign is written between reactants and products if they are more than one reactants or products in any case and an arrow is present which points towards the product side which indicates the direction of the reaction in which it is proceeding.There are coefficients present next to the chemical symbols and formulas .
The balanced chemical equation is Cl2 + 2KBr → 2KCl + Br2. The amount of bromine is calculated as follows:
11.0 g KBr which is 1 mole of KBr/119.002 g KBr × 1 mole of Br₂/2 mole KBr × 159.808 g Br₂/1 mole of Br₂= 7.39 g Br₂.
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If u have 10 moles of C2H2 how many mole of O2 would you need
Answer:
i dont know04487448700
Help out please????
Answer:
B. X= Elements, Y= Compounds
Explanation:
An element is a substance that is made up of only one type of atom. The atoms of an element can combine together chemically to form a molecule but can still exist as an individual atom e.g. Hydrogen atom; H can form molecule H2. Since only one atom makes up an element, its electrons act independently.
Compounds, on the other hand, are substances that are made up of more than one type of atom chemically combined. A compound can only exist as a molecule because it always contains more than one atom bonded together. However, since more than one atom are involved in the chemical bond that holds them together, electrons are shared with other atoms. Example of a compound is H20 containing atoms of hydrogen and oxygen that are chemically combined.
Which substance is the least toxic?
a. chlorine (LD50 = 850 mg/kg)
b. vitamin A (LD50 = 2000 mg/kg)
c. cola (LD50 = 140 mg/kg)
d. aspirin (LD50 = 200 mg/kg)
Answer:
I believe it's D. I searched up a lethal table chart and it states Aspirin is even more toxic than chlorine. As for the other two, it didn't specifically state it was toxic with one dose - meaning you have to take more than one dose for toxicity to take effect.
Explanation:
What does this demonstration show?
HELP PLZ ITS DUE IN 10 MIN "Jack's model includes one object consisting of two molecules and one object consisting of six molecules. He put 16 energy cubes in each object and stated that his model showed the two objects at equilibrium. Explain what is wrong with Jack's model."
(I know it looks long but basically I just need help with finding what's wrong with the model)
Answer: the molecules have different energy and the system is not in equilibrium
Explanation:
The model developed by Jack has the same energy for each of the two objects, but as each object is made up of a different number of molecules, in the system with more molecules, object 2, each one has approximately 2.4 less energy and the molecules of Object 1 have an E / 2 energy.
So when you book them together the molecules have different energy and the system is not in equilibrium
Jack presented the model as if the two objects were in energy balance, but this is not possible, as each object has a different number of molecules.
We can arrive at this answer because:
For the system presented in Jack's model to be in energetic balance, it would be necessary for the two objects present in the model to have the same number of molecules.This is because, with equal amounts of molecules, each object would be able to emit the same amount of energy.However, the object with fewer molecules tends to emit less energy than the object with more molecules.This allows for an uneven, unbalanced emission of energy in the system and this unevenness is not presented in Jack's model.
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Pls help me with this question: This diagram represents the process of?
A.selective breeding
B.natural selection
C.metamorphosis
D.germination
Answer:
A
Explanation:
Selective Breeding
Is your answer because if you look closely to the pic you see the process
Hope this helps:)
Pls mark brainlist
Answer:
A
Explanation:
What determines whether a material melts or burns when heated?
The combustion temperature of a material determines whether a material melts or burns
Materials whose combustion temperatures are lower than their melting point gets burnt instead of melting, because before the temperature of the material is raised up to the melting point temperature, the materials gets combusted at a lower temperature known as the combustion temperature
Melting is physical change and is controlled by the physical property ( melting point ) while burning is chemical change which is irreversible.
Hence we can conclude that The combustion temperature of a material determines whether a material melts or burns
You spill some acid on your clothes, causing a large hole to form where the acid touched the cloth. chemical or physical change.
Answer: Chemical
Explanation:
Answer:
Ah I think it's Chemical
Explanation:
Maybe, because it wasn't just move onto something, it changed it.
what is unique about the intertidal coastline ?
Answer: The intertidal or littoral zone maintains a balance between the land and the sea. It provides a home to specially adapted marine plants and animals.
Explanation: The intertidal zone is the area where the ocean meets the land between high and low tides. A tide pool within Monterey Bay National Marine Sanctuary. Intertidal zones exist anywhere the ocean meets the land, from steep, rocky ledges to long, sloping sandy beaches and mudflats that can extend for hundreds of meters.
D. conduction and induction
8. Which phrase describes grounding?
A. charging an object by polarization
B. providing a safe path for electrons to flow
C. changing a substance from a conductor to an insulator
D. using a device that prevents the flow of electric current
The answer that you are looking for is
Answer:
B
Answer:
D
Explanation:
using a device that prevent the flow of electric current.
This is your answer because it describes it
(Popcorn Stand) A salt shaker has 2.91 moles of NaCl, how many grams of NaCl are in the salt shaker?
Answer:
170 grams NaCl
Explanation:
Find the mass of NaCl by adding the two elements atomic mass
Na: 22.99
Cl: 35.45
22.99+35.45=58.44 g
Convert moles to grams.
2.91 mol NaCl * 58.44 g NaCl= 170.0604 g
How many moles of bromine are needed
Answer:
8.0 moles
Explanation:
Imagine disease kills 85 percent of the wolf population. How will it affect the other organisms?
Answer:
There would most likely be an overpopulation of the animals the wolfs ate.
Explanation:
Answer:
Many populations will grow way to much. Also others will drop in numbers drastically.
Explanation:
Due to the fact that wolves are predators, the prey they eat will grow 85% more. Now, 85% of the wolf population dies, that`s a lot of prey not eaten. Then the prey that are predators to other animals who are over hunted by their predators will most likely drop in numbers drastically, by I mean 85%. This will throw the ecosystem off so much, humans could be at grave risk.
what is the electrical charge of an atom
What is the final, balanced equation that is formed by combining these two half reactions? 2 equations: first: upper C u right arrow upper C u superscript 2 plus, plus 2 e superscript minus. Second: upper N upper O subscript 3 superscript minus, plus 2 e superscript minus, plus 2 upper H superscript plus right arrow upper n upper O subscript 2 superscript minus plus upper H subscript 2 upper O.
Answer: [tex]Cu+NO_3^-+2H^+\rightarrow Cu^{2+}+NO_2^-+H_2O[/tex]
Explanation:
Oxidation-reduction reaction or redox reaction is defined as the reaction in which oxidation and reduction reactions occur simultaneously.
Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation state of the substance increases.
[tex]Cu\rightarrow Cu^{2+}+2e^-[/tex] (1)
Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of the substance gets reduced.
[tex]NO_3^-+2e^-+2H^+\rightarrow NO_2^-+H_2O[/tex] (2)
Combining (1) and (2) we get:
[tex]Cu+NO_3^-+2H^+\rightarrow Cu^{2+}+NO_2^-+H_2O[/tex]
The balanced reaction equation for the reaction described in the question is; Cu + NO3^- + 2H^+ ------> Cu^2+ + NO2^- + H2O
What is a balanced reaction equation?
An equation is said to be balanced when the total number of atoms of each element on the right hand side of the reaction equation is equal to the total number of atoms of the same element on the left hand side of the reaction equation.
The balanced reaction equation for the reaction described in the question is; Cu + NO3^- + 2H^+ ------> Cu^2+ + NO2^- + H2O
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How is space like a vacuum?
what is the density of a small block of wood with a mass of 35g and a volume of 70 cm3
Help plz
Answer:
The density of the wood is 0.5 g/cm³
Explanation:
To calculate density you need to use the formula D = M/V
D = Density
M = Mass (in grams)
V = Volume (in cm³ for solids and mL for liquids)
So, just plug in your given values: D = 35 g ÷ 70 cm³ = 0.5 g/cm³
Voila, you just calculated the density of that piece of wood!
5.Apply six atoms of Element A combined with eight atoms of Element B
to produce sic compound particles. How many atoms of Elements A and
B does each particle contain? Are all of the atoms used to form
compounds?
Answer:24
Explanation:axtizent
Explain why electrons in the outer
energy levels are less stable than
those closer to the nucleus.
Answer:
Explanation:
The electrons in the outer shell can be stripped from their main atom more easy than the inner shell electrons.
How many moles are in 28.0 grams of H0? (Hint: molar mass of H20 is 18.015 g/mol)
1232.25 moles
o
1.55 moles
0.64 moles
O
57.21 moles
Answer:
1.55 moles if i am correct.
List the producers in this food web
Answer:
Tree and Grass?
Explanation:
hope it helps pleass mark me as brainliest answer
what is the physical state of water at - 25°C , 0°C and 100°C
have a great day
Answer:
The liquid form of water starts to become solid (ice) at this temperature.
Which nitrogen base sequence is the partner of C-A-T-C-G-A?
Answer:
G-T-A-G-C-T
this is the answer
Energy of vibrating particles is....
electrical energy
thermal energy
sound energy
mechanical energy
your answer would be sound energy
Explanation:
my brain
Whats the correct answer ??
Answer:
creo que es R no se puede ser
5) Check all the following boxes that are true about electrons
A) The number of electrons must be the same as the number of protons.
B) Changing the number can make atoms unstable.
C) They are mostly located in the nucleus (center) of the atom.
D) Electrons must be removed from the outer rings before they can be removed from
the inner rings.
E) The inner shell has a maximum number of 2 electrons
Other:
Answer:
Explanation:
A isnt true bc there can be isotopes
B: Yes that's true
C: C is false: only protons and neutron live in the nucleus
D that is true: we can see that with ions
E that is true
Can you help with this thanks
Answer:
Steam escapes from a teapot. Is a chemical reaction occurring? No, because liquid to gas would be a physical change, not a chemical change
Explanation:
An equimolar mixture of X (g) and Y (g) is placed inside a rigid container at constant temperature. The particle diagram above represents the changes that occur over time. Based on the particle
diagram, which of the following best predicts whether or not the system has reached equilibrium by 300 s?
a. It is not possible to determine that the system has reached equilibrium by 300 s because the stoichiometry of the reaction is not known.
b. it is not possible to determine that the system has reached equilibrium by 300 s because the amounts of X, Y, and XY have continued to change
c. The system has reached equilibrium by 300 s because the rate of formation of XY is constant
d. The system has reached equilibrium by 300 s because the rates of consumption of X and Y are equal
Answer:
B
Explanation:
t= 300s has more XY than t=200s, which means that it continues to change
*i think
The system has been predicted to be not possible to reach equilibrium as changing X and Y concentration. Thus, option B is correct.
Equilibrium has been described as the condition in the reaction mixture, when the concentration of the product and the reactant are equal.
The given reaction has been represented as:
[tex]\rm X+Y\rightarrow\;XY[/tex]
Reaction mixture at 300 sThe given reaction has been represented as, with the increase in time, there has been the consumption of the reactant and the formation of product.
The concentration has been continuously changing with time. Thus, the determination of the equilibrium has been difficult with changing X and Y concentration.
Thus, option B is correct.
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