Answer:
The required numerical set up is;
RAM = (19.78% * 10) + (80.22% * 11)
Explanation:
The relative atomic mass is the sum of the products of the mass of each isotope and its relative abundance.
Hence the relative atomic mass of Boron is obtained form;
RAM = (19.78% * 10) + (80.22% * 11)
RAM = (1.978) + (8.8242)
RAM =10.8022
In the above picture a solid aluminium rod is being heated by a flame. Explain the main reason why Glob
of wax A melts first.
TE from the candle moves through the air and Glob A feels the heat first
TE from the candle transfers particle to particle by touch through the rod to the wax
TE from the candle is carried by particles as they flow though the rod to the wax.
TE travels up as heat rises to the wax
Answer:
TE from the candle is carried by particles as they flow though the rod to the wax.
Explanation:
A scoop of potassium oxide was placed in
55g of water which produced 67g of
potassium hydroxide. What mass of
potassium oxide was used?
A scoop of potassium oxide was placed in 55g of water which produced 67g of potassium hydroxide then mass of potassium oxide was used is 12g
Potassium oxide is used widely in the agricultural industry as a fertilizer
Here given data is
Potassium oxide was placed in 55g of water which produced 67g of potassium hydroxide
We have to calculate mass of potassium oxide was used =?
Then the reaction is
K₂O + H₂O → KOH
x + 55g = 67g
x = 67g - 55g
x = 12g
Therefore mass of potassium oxide was used is 12g
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ine element and compound with example.
What is symbol? Write its significance.
Define mixture. Write its types.
Write the difference between mixture and compound.
What is a chemical equation? What are the essentials of
chemical equation? What information is conveyed by
chemical equation? What are its limitations and how are they
removed?
What do you understand by balancing of a chemical equation
Why 'partial equation method' is considered to be better than
"hit and trial method'?
What information is
Explanation:
an element is a substance which cannot be spilt upto two or more simple substances.For eg gold,silvera compound is the substance produced by the union of two or more elements in a definite proportion by weight .For eg water,carbon dioxideI dont knowA mixture is a substance formed by mixing two or more elements are compounds in any proportion by mass .Its types are:Hetregeneous mixture and homogeneous mixture.the difference between mixture and compound is that a mixture is a substance formed by mixing two or more elements are compounds in any proportion by maths and compound is a substance produced by the union of two or more elements in a definite proportion by weight.chemical equation is defined as the symbolic representation of a chemical reactionWhich of the following best describes the material that makes us the mantle?
Answer:
A- a rigid solid
Explanation:
The Earths mantle is mainly made up of rock and rocks are rigid and are solid.
Iron (ii) chloride solution is changed into Iron(iii) chloride solution after sometime,
give a reason. ( 26Fe)
Answer:
See explanation
Explanation:
When left to stand, a solution of Iron II chloride is converted to Iron III chloride by oxidation in air.
The Iron III chloride is composed of weak field ligands in its coordination sphere. These weak field ligands mostly occur in a high spin configuration hence, the central iron atom can be converted from Fe[(H20)6]^2+ .2Cl^-(high spin d6) to Fe^3+[(H20)6]^3+ .3Cl^-(high spin d5).
What is a net ionic equation?
A. An equation that is balan
B. An equation that shows a
Answer:
Explanation:
An equation showing only what is involved in the reaction.
a o e x
word equation for reaction between copper and chlorine
You have 0.21 moles of Al how many atoms do you have
Number of atoms : 1.26 x 10²³
Further explanationThe mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
0.21 moles of Al, so n = 0.21
Number of atoms :
[tex]\tt N=0.21\times 6.02\times 10^{23}\\\\N=1.26\times 10^{23}[/tex]
For the reaction H2(g) + 12(g) = 2HI(g), Kc = 50.2 at 445°C. If
[H2] = [12] = [HI] = 1.75 x 10-3 Mat 445°C, which of the
following is true based on the above?
Qc < Kc, the reaction proceeds from left to right to reach equilibrium
Further explanationGiven
K = 50.2 at 445°C
[H2] = [I2] = [HI] = 1.75 × 10⁻³ M At 445ºC
Reaction
H2(g) + I2(g) ⇔2HI(g)
Required
Qc
Solution
Qc for the reaction
[tex]\tt Qc=\dfrac{[HI]^2}{[I_2][H_2]}\\\\Qc=\dfrac{(1.75.10^{-3})^2}{1.75.10^{-3}\times 1.75\.10^{-3}}=1[/tex]
Qc < Kc ⇒ reaction from left(reactants) to right (products) (the reaction will shift on the right) until it reaches equilibrium (Qc = Kc)
Select the correct answer.
What is the heat content, q, of the reaction when glucose burns?
OA. q=0
OB. q> 0
O C. q<0
OD. 920
Answer: C. q < 0
Explanation: sorry if I'm wrong
Convert 4.92L of hydrogen at STP to moles
Answer:
0.22moles
Explanation:
Given parameters:
Volume of gas = 4.92L
Unknown:
Number of moles = ?
Condition = STP
Solution
At STP, the number of moles of a given gas is expressed as;
Number of moles = [tex]\frac{volume given}{22.4}[/tex]
Number of moles = [tex]\frac{4.92}{22.4}[/tex] = 0.22moles
What are the different states of matter and how do they transition from one to
the other? Help plz
Solid is the state in which matter maintains a fixed volume and shape; liquid is the state in which matter adapts to the shape of its container but varies only slightly in volume; and gas is the state in which matter expands to occupy the volume and shape of its container.??.....
cellular respiration is when what energy from sugar/glucose is converted to cellular
Answer:
The correct answer is - cellular respiration is when chemical energy from sugar/glucose is converted to cellular energy in the form of ATP.
Explanation:
Cellular respiration is a set of metbolic reaction that takes place inside the cell and breaking the sugars or nutrients to convert the chemical energy present in the nutrients into the cellular energy whic is used by cells that is ATP and release water and carbon dioxide as waste.
In this process the ammount of energy store in the cellular currecncy or ATP which is the form of energy that is utilized by the to perform its sunction. The chemical energy that is present in the nutrients or sugar is come from light energy which is stored in the nutrients by photosyntheis process.
6.3 moles of water h20
Answer:
6.3 moles of water = 6.3*18=113.4 grams per mole
Explanation:
Hey please answer this for me thanks.
Explanation:
Moles of N2 = 84/28 = 3.0mol
Moles of H2 = 29/2 = 14.5mol
Hence amount of ammonia produced = 6.0 * 17 = 102g.
The constant collisions of the moving particles of a gas with the walls of the container produce the characteristic called
Answer:
Pressure
Explanation:
Apply the definition of pressure to this problem.
Answer:
energy or pressure
Explanation:
Which statement best describes what happens to the energy of the particles when water vapor begins to cool?
A. The average potential energy decreases.
B. The average kinetic energy decreases.
C. The average potential energy remains the same.
D. The average kinetic energy remains the same.
Average kinetic energy is the average sum of all kinetic energy of all the molecules of gases. Therefore, the correct option is option B that is average kinetic energy decreases.
What is kinetic energy?It is a energy which is possess by a moving object. It is very difficult to find the correct value of kinetic energy so we find average kinetic energy. Which is very easy to calculate as compared to calculating kinetic energy. It is not dependent on the type of gases or mass of gases.
Mathematically,
K.E=1/2mv²
Where,
m= mass of particles
v= velocity of particles
Water vapor condenses when it cools. Water undergoes a phase shift, transitioning from the gas to a liquid. Evaporation is the inverse of condensation. When water vapor begins to cool, average kinetic energy decreases.
Therefore, the correct option is option B.
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12. Study the chemical reaction below, what are the product(s) in the reaction and what are the reactant(s) in the reaction (Short answer)
Aluminum + copper chloride ---> copper + aluminum chloride
Explanation:
The reactants are Aluminium and Copper chloride.
The products are Copper and Aluminium chloride.
how does a tiny seed turn into a tree overtime?
Answer:
A group of cells ready to form roots a stem and the first leaves
Compare and contrast a thermodynamically stable compound and a kinetically stable compound at room temperature with respect to overall energy change, spontaneity with which decomposition occurs, and reaction rate.
Answer:
"im different"
Explanation:
What is
the commission amount on 500000 at rate of 6%
Answer:
30000
Explanation:
6/100×500000 =30000
How do particles change as the temperature increases in a system? Is this a chemical or physical change?
Answer:
chemical change
Explanation:
particals react to temperature wheteher its cold or warm
The particles begin to move at a higher speed. It is a physical change.
Temperature is defined as the average kinetic energy of the particles of a body. Hence, when a body is heated, the kinetic energy and consequently the speed of its particles increases.
This increase in particle speed is reversed when the system cools down. Recall that a physical change is easily reversible while a chemical change is not easily reversible.
As such, this increase of particle speed with temperature is a physical and not a chemical change.
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Lithium is a metal,chlorine is a non metal,so LiCl would be a ______bond
a.Metallic
b.Covalent
c.Ionic
Explain how a light can be seen when sent through a colloid mixture, but not a solution.
i have 5 minutes pls help
what is the water write example
Answer:
Water, a substance composed of the chemical elements hydrogen and oxygen and existing in gaseous, liquid, and solid states. It is one of the most plentiful and essential of compounds. A tasteless and odourless liquid at room temperature, it has the important ability to dissolve many other substances.
Explanation:
Answer/Explanation:
Water is a colorless and tasteless liquid that makes up an organism or body of any sort.
The meaning of the (holy)water is the spirit that flows in each person that will keep their hearts satisfied. Jesus used this term when talking to a Samaritan at a well. Water is also the source of the living water that springs up into eternal life. When talking about this water, Jesus was referring to himself. For His water(blood) had not yet been poured out and it could not yet cleanse (those who believed in him would be gushing out with the living water).
What is the chemical equation for photosynthesis?
A. carbon dioxide + water + glucose yields sunlight + oxygen
B. glucose + oxygen + water yields carbon dioxide + helium + light energy
C. carbon dioxide + oxygen yields light energy + water
D. carbon dioxide + water + light energy yields glucose + oxygen
Answer:
D.
Explanation:
This is the correct equation for photosynthesis! :)
wo people push on the same door from opposite sides as shown.
A man pushes on a door from the left. A woman pushes on the door from the right.
They will only see the door move when
both people exert the same force so that the forces are unbalanced.
neither person exerts a force on the door so that the net force is zero.
one person exerts more force than the other so that the forces are unbalanced.
both people exert the same force so that the forces are balanced.
Answer is:
When one person exerts more force than the other so that the forces are unbalanced........ maybe, im not sure if im right
Answer:
c
Explanation:
What is the name of the compound (NH4)2SO4
Which of the following elements is most reactive.
A Chlorine
B Bromine
C Fluorine
D Helium
Answer:
c.
Fluorine
Explanation:
The temperature of a reaction vessel with liquid reactants is lowered to one-third of the original temperature. What will happen to the rate of the reaction?
A) It will increase because fewer particles will have the required activation energy.
B) It will decrease because fewer particles will have the required activation energy.
C) It will increase because surface area of the particles will increase.
D) It will decrease because surface area of the particles will increase.
Answer:
B) It will decrease because fewer particles will have the required activation energy.
Explanation:
Temperature is one of the important factors that affect the rate of a chemical reaction. An increase in the temperature of a reaction will cause the reactants to gain more kinetic energy and hence, reduce the energy required for reactants collision (start) to occur i.e. activation energy.
Note that, once the activation energy is reduced, the rate of reaction is increased. In this case, the temperature of a reaction vessel with liquid reactants is lowered to one-third (1/3) of the original temperature. Due to a reduction in the reaction's temperature, the rate of reaction will also decrease because fewer particles will have the required activation energy.
Answer:
B. It will decrease because fewer particles will have the required activation energy.
Explanation:
I took the text :)
