The most appropriate option is :
[tex]\hookrightarrow \bf2. \: \mathrm{ \underline{oxygen \: \: and \: \: silicon}}[/tex]
Since, they are the most abundant elements found in Earth's Crust.
Oxygen (46%)Silicon (28%)[tex]\circ { \underline{ \boxed{ \sf{ \color{green}{ \mathrm{hope \: \: it \: \: helps \: \: you .....}}}}}}∘[/tex]
How many moles in 4.65 g of Helium?
Answer:
4.65 g x 1 mol/4.0026 g/mol = 1.162 mol helium
Explanation:
Adding a catalyst to a system at equilibrium lowers the activation energy required by a system, which system, which shifts the equilibrium position toward the products.
True or false?
Answer: False
Explanation: Took the test
Answer:
False
Explanation:
What is the limiting reactant in a reaction where 10.0 mol of iron is treated with 12.0 mol of bromine? The product that forms is FeBr3. First, write and balance the chemical equation. Next, calculate the moles of FeBr3 that can be made from 10.0 mol of Fe. Then calculate the moles of FeBr3 that can be made from 12.0 mol of bromine. The smaller amount of FeBr3 reveals the limiting reactant.
Answer: The limiting reagent in the reaction is bromine.
Explanation:
Limiting reagent is defined as the reagent which is completely consumed in the reaction and limits the formation of the product.
Excess reagent is defined as the reagent which is left behind after the completion of the reaction.
Given values:
Moles of iron = 10.0 moles
Moles of bromine = 12.0 moles
The chemical equation for the reaction of iron and bromine follows:
[tex]2Fe+3Br_2\rightarrow 2FeBr_3[/tex]
By the stoichiometry of the reaction:
If 3 moles of bromine reacts with 2 moles of iron
So, 12.0 moles of bromine will react with = [tex]\frac{2}{3}\times 12.0=8moles[/tex] of iron
As the given amount of iron is more than the required amount. Thus, it is present in excess and is considered as an excess reagent.
Hence, bromine is considered a limiting reagent because it limits the formation of the product.
Thus, the limiting reagent in the reaction is bromine.
Potassium (K):
g/mol?
An unknown substance weighing 42.0 g was heated from 36.0°C to 65.0°C. In this process, the
substance absorbed 5895 J of energy. What is the specific heat of the substance?
A. 5895 J/(g*C)
B. 4.18 J/(g*C)
C. 4.84 J/( g*C)
D. O.06 J/(g*C)
Answer:
A. 5895 J/g*C)
Explanation:
An unknown substance weighing 42.0 g was heated from 36.0°C to 65.0°C. In this process, the substance absorbed 5895 J of energy.
(02.01 MC) Which state of matter does this model represent?
O Solid
O Liquid
O Gas
O Plasma
Answer:
Hello There!!
Explanation:
I believe the answer is O Gas.
hope this helps,have a great day!!
~Pinky~
I need to know the answer to this question
Answer:
your awnser would be 72.1
Explanation:
hope this helps have a good day :]
How many joules are required to heat 120.5!grams of water from 5.6°C to 62.5°C
Answer:
The amount of energy required is 17 kJ.
Explanation:
On a warm sunny day, a deer is searching something to drink. The deer is most likely responding to which kind of stimulus?
Answer:
External stimulus of thirst
Answer:
your answer is: the external stimulus of thirst
Explanation:
I took the test :)) hope this helps!!!!!!
help bc i need it lol
Answer:
2 XE + 1 AB. --> 1 AE2 + 2 XB
Above equation is now balanced
The solubility of gases in liquids The solubility of gases in liquids increases as temperature increases and increases as pressure increases. increases as temperature increases and decreases as pressure increases. decreases as temperature increases and decreases as pressure increases. decreases as temperature increases and increases as pressure increases. is independent of temperature and increases as pressure increases.
Answer:
As the kinetic energy of the gaseous solute increases, its molecules have a greater tendency to escape the attraction of the solvent molecules and return to the gas phase. Therefore, the solubility of a gas decreases as the temperature increases.
Explanation:
As the kinetic energy of the gaseous solute increases, its molecules have a greater tendency to escape the attraction of the solvent molecules and return to the gas phase. Therefore, the solubility of a gas decreases as the temperature increases
Scenario 1: Sarah, your lab partner, accidentally poured too much
sodium chloride (chemical) into a beaker. She wants to pour the rest back
into the original container. What should you do? Explain
Scenario 2: You notice that yout lab partner is chewing gum and using a
beaker as a cup to get water. He then takes a drink from the beaker. He
assures you that it is clean and you don't have to worry. Why is this
dangerous in lab? Explain.
Scenario 3: In lab, you are working with an open flame (a birthday
candle) and your friend calls you over to see new background picture on
his chromebook. What should you do? Explain
Which is a characteristic of nuclear fission?
Answer:
Contrasting Nuclear Fission and Nuclear Fusion
Nuclear FissionByproducts of the reaction: Fission produces many highly radioactive particles.Conditions: Critical mass of the substance and high-speed neutrons are required.Energy Requirement: Takes little energy to split two atoms in a fission Explanation:
Angiosperms produce brightly colored blooms and sweet-smelling flowers. Why have angiosperms developed these adaptations? A. to ensure seed dispersal B. to keep predators from eating the plants C. to attract pollinators and help ensure fertilization D. to allow time for seed development
Answer:
C
Explanation:
Angiosperms have developed these adaptations because it attracts pollinators which helps the ecosystem grow.
The aximuthal quantum number of an orbital is 3. What are the possible values of m?
For a given valye of l(l shell), values of m are from -l to 0 to l, so m could be; -3, -2, -1, 0, +1, +2, +3.
Easyy!
the value of m is equal to 2l+1 so there must beseven values for m.
m can have values from -l through zero to +l so the values are -3, -2, -1, 0, +1, +2 and +3.
How does a nuclear reactor produce electricity
Answer:
Explanation:
Nuclear reactors are the heart of a nuclear power plant. They contain and control nuclear chain reactions that produce heat through a physical process called fission. That heat is used to make steam that spins a turbine to create electricity. Nuclear power plants use heat produced during nuclear fission to heat water. The heat produced during nuclear fission in the reactor core is used to boil water into steam, which turns the blades of a steam turbine. As the turbine blades turn, they drive generators that make electricity
Witch part of an atom is mostly empty space?
Which is the most likely way an automotive engineer would use chemistry?
A. By testing the maximum speed and stopping distance of a new
car
B. By doing market research to determine which types of cars
consumers want
C. By designing cars that are more aerodynamic
D. By making parts that reduce the pollutants cars emit
Answer:
by making parts... emit
Please somone help me with a chemistry question brainliest to whoever answers correctly and 20 points
Answer:
3132 is the answer
Explanation:
3BaCl2 + Al2S3 → 3BaS + 2AlCl3
Answer:
Explanation:
Hope this helps u !!
What process takes place when hydrogen-3 and hydrogen-2 combine to form
helium-4 plus a neutron?
A. Fusion
B. Alpha decay
C. Beta decay
D. Fission
Answer:
A. Fusion
Explanation:
Perform the following
mathematical operation, and
report the answer to the correct number of significant figures.
7.68 x 4.564 = [?]
Hydrogen and nitrogen react to form ammonia. The chemical equation for this reaction is shown here. 3 H2(g) + N2(g) 2 NH3(g). What amount of hydrogen will produce 44.0 mol of ammonia?
66.0 mol
88.0 mol
132.0 mol
29.3 mol
Answer:
someone already answered but i think it's 132.0 mol too
Which piece of information do you need to determine whether a hydrocarbon
is saturated or unsaturated?
A. The type of C-C bonds in the molecule
B. The number of C-C bonds in the molecule
C. The type of C-H bonds in the molecule
D. The number of C-H bonds in the molecule
Answer:
A
Explanation:
Saturated means all the carbon atoms has four single bonds around it. These bonds are strong and won't break easily therefore saturated hydrocarbons aren't very reactive
Unsaturated means in one instance the C has a double bond with another carbon. This double bond can be easily broken therefore making unsaturated compounds more reactive than saturated compounds
So saturation deals with the type of bonds the carbon has with other carbon atoms. (The C-C bonds)
Which of the following is the strongest acid?
a.pH = 12
b.pOH = 5
c.[H+] = 1 x 10-8
d.pOH = 12
Answer:
d. pOH = 12 => pH = 14 - 10 = 2 => most acidic
Explanation:
pH = -log[H⁺] => [H⁺] = 10^-pH
By definition, if ...
[H⁺] > 10⁻⁷ > [OH⁻] => pH < -log(10⁻⁷) < 7 => pOH > 14 - 7 > 7 => acidic solution
[H⁺] = 10⁻⁷ = [OH⁻] => pH = -log(10⁻⁷) = 7 => pOH = 14 - 7 = 7 => neutral solution
[H⁺] < 10⁻⁷ < [OH⁻] => pH > -log(10⁻⁷) > 7 => pOH < 14 - 7 < 7 => basic solution
∴ From most basic to most acidic ...
a. pH = 12 => most basic
b. pOH = 5 => pH = 14 - 5 = 9
c. [H⁺] = 1 x 10⁻⁸ => pH = -log(10⁻⁸) = -(-8) = 8
d. pOH = 12 => pH = 14 - 10 = 2 => most acidic
If you could somehow travel inside an atom and look around, what part of the atom would you want to look at? What would you want to understand better as a result of your "travels"? Write your answers in 2-3 paragraphs.
Answer:
See explanation
Explanation:
The interior of the atom is composed of electrons which move around in orbits and the nucleus. The nucleus contains protons and neutrons. The electrons are negatively charged while the protons are positively charged, the neutrons have no charge at all.
The atom is held together by electrostatic interaction between the electrons and protons in the nucleus. The protons and neutrons account for most of the mass of the atom.
The greatest wonder that I will like to really understand in the interior of the atom is the nature of the interaction between the neutrons and protons in the atomic nucleus which holds the nucleons together. The neutrons have no charge while the protons are positively charged. What sort of interaction could exist between an uncharged particle and a charged particle? That is what I will like to understand better as a result of my travels into the interior of the atom.
Answer:
help
Explanation:
Can you identify what object is being represented by the model on the right? A. Arc of a circle B. Amount of radiation C. Area of a circle
Answer:
C area of a Circle.
Explanation:
Got it right. Edg2021.
Answer:
C
) area of a circle
Explanation:
edge 2023
Jello has a density of 1.14 g/mL. A box of Jello makes 475 mL of Jello and has 13 g of sugar. Determine the % m/m of sugar in the Jello. (Hint: d=m/v)
Answer:
2.34 %
Explanation:
Since the density of the Jello, ρ = 1.14 g/mL and ρ = m/v where m = mass of jello and v = volume of jello = 475 mL.
So, m = ρv
substituting the values of the variables into the equation, we have
m = ρv
m = 1.14 g/mL × 475 mL = 541.5 g
Since we have 13 g of sugar in the jello, the total mass present is 13 g + 541.5 g = 554.5 g
So, the percentage by mass of sugar present % m/m = mass of sugar present/total mass × 100 %
= 13 g/554.5 g × 100 %
= 0.0234 × 100 %
= 2.34 %
So, the percentage by mass of sugar present % m/m = 2.34 %
One way industrial chemists aim to improve manufacturing and sales is by manipulating extemal factors to increase the rate of the reaction.
As an industrial chemist you have been asked by the CEO of your company to propose conditions that will increase the rate of production of
acetaminophen (the active ingredient in Tylenols). In a well-written letter to the CEO include three possible methods for increasing the
reaction rate and explain why each proposed change will increase the reaction rate Justity your recommendations using scientinc principles
The chemical synthesis of acetaminophen C.H.NO, is represented by the following equation
There are several methods that can be employed to increase yield in the chemical synthesis of acetaminophen.
What is chemical synthesis?The term chemical synthesis has to do with the method of producing a chemical substance from other chemical substances.
It is usual in industrial chemistry to seek to optimize the yield of the target product. In the chemical synthesis of acetaminophen as shown in the image attached, the yield of the product can be increased by;
1) Removal of the ethanoic acid byproduct to drive the forward reaction
2) Increasing the concentration of each of the reactants to ensure that more product is obtained.
3) Operating the process at a higher temperature to ensure that reaction is more efficient.
Learn more about rate of reaction:https://brainly.com/question/13440548
#SPJ1
What makes plants the beginning of the food chain?
please answer my question aswell as my last one!
Answer: A
Explanation:
i just took the quiz and it was right!
The ideal gas law equation is: PV = nRT
Use the ideal gas law to calculate the moles of gas in a container that has a pressure
of 700kpa, volume of 2L and a temperature of 450K.
Answer:
The answer is the first option 0.37 moles
Explanation:
the ideal gas law is PV = nRT, so in the terms of n,
n = PV/RT (divide both sides by RT to let n stand alone)
given: P = 700 kpa, V = 2L, T = 450 K , R = 8.31
n = (700 * 2) / (8.31 * 450)
= 1400/3739.5
= 0.34