when I was really confused in science class and I think a lot but not found in book then I get help from my friend but he also don't know that and then finally my teacher solves it the question was what makes a rainbow .
A flask is filled with 50.0 ml of 0.15 M HCl acid. Exactly 0.054 grams of CaCo3 are placed in the acid,
neutralizing some of it. How many moles of NaOH must be added in a titration that neutralizes the rest
of the acid?
Answer:
See explanation
Explanation:
2HCl(aq) + CaCO3(aq) ------->CaCl2(aq) + CO2(g) + H2O(l)
Number of moles of acid present = 50/1000 * 0.15 = 0.0075 moles
Number of moles of calcium carbonate = 0.054g/100 g/mol = 0.00054 moles
2 moles of HCl reacts with 1 mole of calcium carbonate
x moles of HCl reacts with 0.00054 moles of calcium carbonate
x = 2 * 0.00054/1
x = 0.00108 moles of HCl
Amount of acid left = 0.0075 moles - 0.0075 moles = 0.00642 moles
Reaction of HCl and NaOH
HCl(aq) + NaOH(aq) ------> NaCl(aq) + H2O(l)
Since the reaction is in the mole ratio of 1:1
0.00642 moles of HCl is neutralized by 0.00642 moles of NaOH
List the stages of the Flowering Plant Life Cycle starting with the seed
16.1 g of bromine are mixed with 8.42 g of chlorine to give an actual
yield of 21.1 g of bromine monochloride.
The question is complete, the complete question is;
16.1g of bromine are mixed with 8.42g of chlorite to give an actual yield of 21.1g of bromine monochloride.
Answer:
91 %
Explanation:
Br2 + Cl2 ------>2BrCl
Number of moles of Chlorine = 8.42/71 = 0.119 moles
If 1 mole of Cl2 yields 2 moles of BrCl
0.119 moles of Cl2 will yield 0.119 moles * 2/1 = 0.238 moles of BrCl
Number of moles of Br2 reacted = 16.1/160 = 0.1 moles
If 1 mole of Br2 yielded 2 moles of BrCl
0.1 moles of Br2 yields 0.1 * 2/1 = 0.2 moles of BrCl
Bromine is the limiting reactant.
Mass of BrCl produced = 0.2 moles * 115.357 g/mol = 23.07 g
Theoretical yield = 23.07 g
Actual yield = 21.1 g
Percentage yield = Actual yield/Theoretical yield * 100
= 21.1/23.07 * 100 = 91 %
What is the last metamorphic rock
before the rock starts to melt and turn
back into magma/lava
Answer:
Explanation:
marble perhaps
I can't leave till I answer please help!!
Answer:
The answer is 2 all you do is divide the 6.02 and 3.01 and you get 2
Find the moles of CaCO3 in 23.4 g of calcium carbonate
Answer:
0.0326 moles
explanation
Answer:
0.234 mol
Explanation:
m(CaCO3) = 23.4g
n(CaCO3) = ?
M(CaCO3) = 100.09 g/mol
n = m/M
n(CaCO3) = 23.4 / 100.09
= 0.234 mol (3 s.f.)
Which intermolecular forces exist in dry ice, CO2(S)?
Answer:
Ice (solid H2O) and dry ice (solid CO2) are examples of molecular solids. Molecular solids are held together by intermolecular forces—dispersion forces, dipole–dipole forces, and hydrogen bonding. Ice is held together by hydrogen bonds, and dry ice is held together by dispersion forces.
Balance the following chemical equation
Mg + O₂ → MgO
Answer:
2Mg + O₂ → 2MgO
Explanation:
2 points
Stu Dent wants to create a salt water solution. He uses 0.614 moles of salt and 182 milliliters of water. What is the molarity of the solution?
Type your answer...
Answer: The molarity of solution is 3.37 M
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]
where,
n = moles of solute = 0.614
[tex]V_s[/tex] = volume of solution in ml = 182 ml
Now put all the given values in the formula of molarity, we get
[tex]Molarity=\frac{0.614\times 1000}{182}=3.37M[/tex]
Therefore, the molarity of solution is 3.37 M
Is neon an atom or ion
On earth what is the main force that resists all motion?
Answer: Friction
Explanation: Friction is a force that opposes motion. When two objects are in contact, friction is acts in a direction opposite to the motion of the object. Please give me brainliest!!!!!!!
Answer: friction: The resistance an object meets when moving over a surface or through a gas or liquid; it is the force that resists the motion of two surfaces that are touching each other.
Explanation:
a large molecule made up of smaller molecules called amino acids
ATP
carbohydrate
lipid
protein
phospholipid
nucleic acid
Answer:
Protein
Explanation:
Student uses a magnet to move 0.0 25 KG metal box the magnet exerts a force of 5N which causes the ball to begin moving what is the acceleration of the ball when it begins to move
Answer: 200 m/s2
Explanation:
10. Lead nitrate solution mixed with sodium sulfate solution forms lead sulfate as a
precipitate.
Pb(NO3)2+ Na2SO4-
PbSO4+ 2NaNO3
In an experiment, the theoretical yield of lead sulfate for this reaction was 2.85 g.
In the experiment only 2.53 g of lead sulfate is obtained.
Calculate the percentage yield of lead sulfate in this experiment. * IT
Answer:
88%.
Explanation:
The percentage yield of lead sulfate in this experiment is 88% if 2.53 is divided by 2.85 and multiply by 100. The percentage yield can be calculated when the experimental yield is divided by theoretical yield and then multiply by 100. The percentage yield tells us about the actual yield that is gained in the end of experiment which is lower than theoretical yield.
Why are fossil fuels considered to be a nonrenewable resources? Please help
Answer:
They're considered nonrenewable because they take millions of years to develop. They can't be renewed as fast as we're taking them.
What is the electronegativity difference between oxygen and fluorine? What type of bond is this?
Answer:
Veja, por exemplo, que os elementos mais eletronegativos são os que estão no canto superior direito da tabela, isto é, o flúor (4,0) e o oxigênio (3,5), e os menos eletronegativos são os que estão no canto inferior esquerdo, que são o frâncio (0,8) e o césio (0,8).
Explanation:
In an ionic compound a
Nisbonded to a
The element in the compound that has a positive charge is called the
while the element with the negative charge is called the
Answer:
In an ionic compound a metal is bonded to a nonmetal.
The element in the compound that has a positive charge is called the cation
while the element with the negative charge is called the anion.
Explanation:
In an ionic compound a metal is bonded to a nonmetal.
The element in the compound that has a positive charge is called the cation
while the element with the negative charge is called the anion.
In which orbitals would the valence electrons for selenium be placed ?
Answer:
Valence electrons of selenium will be placed in s and p-orbitals.
Which salt shows the least change in solubility from 0 ⁰ – 100 ⁰ C?
Answer:
From the solubility curve, which salt shows the least change in solubility as the temperature increases? NaCl
Explanation:
What is the partial pressure of hydrogen gas in a mixture of hydrogen Nitrogen, and helium if the total pressure is 700 partial pressure is 155 mmHg, and the partial pressure of nitrogen is 265 mmHg?
How does stoichiometry work?
Answer:
stochiometry works with measuring quantitative relationships and used to determine the amount of products and reactants that are produced or needed in a reaction
Answer:
Stoichiometry is the calculation of reactants and products in chemical reactions in chemistry. Stoichiometry is founded on the law of conservation of mass where the total mass of the reactants equals.
CAn someone help me with this?
Answer:
I think D. sorry if I'm wrong:)
Think about chemicals you may have in your home and list as many as you can think of:
Sucrose; C12H22O11
C9H8O4; acetyl salicylic acid
H2O2; hydrogen peroxide,
NaOH; sodium hydroxideExplanation:
What is the answer for 250 K = ? °C
Answer:
This is your answer ☺️☺️☺️
Answer:
-23.15
Explanation:
question, if thallium (atomic number 81) has an effective nuclear charge of 3+, how many core electrons does thallium have? is it 78?
Answer:
Yes it is 78 because it has lost three electrons and it has a positive nuclear charge
if 135 grams of MgCl2 are dissolved in a 1.0 L solutions, what is the molarity of the solution?
Answer: 1.418 M
Explanation:
molarity = moles of solute/liters of solution or [tex]M=\frac{mol}{L}[/tex]
first we have to find our moles of solute (mol), which you can find by dividing the mass of solute by molar mass of solute
mass of solute: 135 g
molar mass of solute: 95.21 g/mol
let's plug it in:
[tex]\frac{135 g}{95.21 g/mol} = 1.418 mol[/tex]
next, we plug it into our original equation:
[tex]\frac{1.418 mol}{1.0 L} = 1.418 M[/tex]
When bonds are (broken/formed) there is a positive energy change.
Answer: Hello i am confused are you asking a question?
Explanation:
High conductivity and malleability are characteristics of
Which of the following general trends are true for the atomic mass of elements in the periodic table?
1. The atomic mass is usually a decimal number.
II. The atomic mass is always smaller than the atomic number.
III. The atomic mass increases from top to bottom down a group.
IV. The atomic mass increases from left to right across a period.
HELP PLEASE THERE IS NO PICTURE PLZ JUST LEAVE THE ANSWER!!
Answer:
D. the atomic mass increases from left to right
Explanation:
Gaseous ethane CH3CH3 reacts with gaseous oxygen gas O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O. What is the theoretical yield of carbon dioxide formed from the reaction of 1.8g of ethane and 4.6g of oxygen gas?
Answer:
mass of CO₂ produced = 5.06 g of CO₂
Explanation:
Equation of the reaction: 2CH₃CH₃ + 5O₂ ---> 4CO₂ + 6H₂O
From the equation of the reaction, 2 moles of gaseous ethane reacts with 5 moles of oxygen gas to produce 6 moles of water.
molar mass of ethane = 30 g/mol
molar mass of oxygen gas = 32 g/mol
number of moles of ethane present in 1.8 g = 1.8/30 = 0.06 moles
number of moles of oxygen gas present in 4.6 g = 4.6/32 = 0.14375 moles
mole ratio of oxygen gas to ethane = 2.4 : 1
Therefore, oxygen is the limiting reactant
0.14375 moles of oxygen will react with 0.06 moles of ethane to produce 4/5 * 0.14375 moles of CO₂ = 0.115 moles of CO₂
molar mass of CO₂ = 44 g/mol
mass of CO₂ produced = 0.1725 * 44
mass of CO₂ produced = 5.06 g of CO₂