Find the molar mass of CaCO3
Answer:
molar mass of caco3 is
100.0869 g/ mol
What is the molarity of a solution containing 29g of NaCl in 1L solution?
Answer:
hope this helps
Explanation:
1M NaCl solution is 58.5 g/1000 ml , where molecular wt of NaCl being 58.5 grams , so 29.2 g of NaCl in 1000 ml of water will be equal to : 29.2g /58.5g = 0.499145299 M , so 29.2 g NaCl dissolved in 100 ml would correspond to , 0.499145299 M X 1000 ml/100 ml = 4.99145 M or about 4.99 M
What is the concentration of a solution of HBr if 0.40 L is neutralized by 0.20 L of 0.50M solution of LiOH?
What is the systematic name of the following compound?
\text{Mn}_3 (\text {PO}_4)_2Mn
3
(PO
4
)
2
Answer:
Manganese (II) Phosphate
Explanation:
Mn3(PO4)2 is the compound given in this question. Manganese is the metal and hence it will come first in the name. Along with the name of metal it is essential to determine the valency of the metals based on the compound structure.
Here 2 PO4 attaches with 3 Mn
Valence of PO4 is -3
So the total electrons contributed by PO4 is 3*2 = 6
Now Mn has 3 atoms in the compound. Thus, per atom the valency must be 2 in order to satisfy -6 charge of PO4
Thus, valency of Mn is 2
So, the name will be
Manganese (II) Phosphate.
Calculate the change in heat (Q) that occurs when 27.58grams of liquid water at 16°C heats to water vapor at 62°C. (cp = 4.184 J/g°C)
Answer:
5308.16J
Explanation:
Using the formula;
Q = m × cp × ∆T
Where;
Q = change in heat (J)
m = mass of substance (g)
cp = specific heat capacity (4.184 J/g°C)
∆T = change in temperature (°C)
According to the information given in this question;
Q = ?
m = 27.58 grams
cp = 4.184 J/g°C
∆T = 62°C - 16°C = 46°C
Using Q = m × cp × ∆T
Q = 27.58 × 4.184 × 46
Q = 5308.157
Q = 5308.16J
Human body cells are made by doing what ?
Answer:
When cells become damaged or die the body makes new cells to replace them. This process is called cell division. One cell doubles by dividing into two. Two cells become four and so on.
Explanation:
When a solid suddenly appears when two substances are mixed, and it settles to the bottom, collects on another object, or makes a solution loudy, that solid is known as a _____. pls help ASAP!
Answer:
Precipitates Form
Explanation:
I apologize if I am wrong
Name the type of equation then balance. Sn,(PO2)2 + Fe(CIO): - Sn(CIO3)2 + FePO,
Answer:
ionic compond
Explanation:
Sn(ClO3)4
How many moles of silver nitrate are there in 80.00 grams of silver nitrate?
Answer:
0.47094837228 moles
Explanation:
silver nitrate=169.87g per mol
80/169.87 = 0.47094837228
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 0.47moles of silver nitrate are there in 80.00 grams of silver nitrate.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
number of moles of substance =given mass of substance ÷ molar mass of substance
Molar mass of 1 mole of silver nitrate=169.87g/mol
mass of silver nitrate= 80g
Substituting all the given values in the above equation, we get
number of moles of silver nitrate=80 ÷169.87
=0.47moles
Therefore, 0.47moles of silver nitrate are there in 80.00 grams of silver nitrate.
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Which of the following describes fertilization?
Answer: Fertilization defintion
Explanation:
the action or process of fertilizing an egg, female animal, or plant, involving the fusion of male and female gametes to form a zygote.
Or giving rise to new indivisual organisms or offspring and initiating development
write any 2 uses of fractionate distillation
Answer:
Fractional Distillation could be used to:
Obtain the different fractions of a crude which may have more uses and be more useful.Obtain ethanol from a mixture of ethanol and water.Fractional Distillation is used to obtain one substance from a mixture. It depends on the boiling points of the substances.
Number 1 plsssssssssssssssssssssssss
6. How is Avogadro’s number used to convert moles into particles?
Explanation:
Avogadro's number is a very important relationship to remember: 1 mole = 6.022×1023 6.022 × 10 23 atoms, molecules, protons, etc. To convert from moles to atoms, multiply the molar amount by Avogadro's number.
What is ∆G system for the system that is described by the following data?
∆H system= -232 kJ, T= 293 K, ∆S system= 195 J/K
∆G system= ∆H system - T∆S system
a. -289 kJ
b. -175 kJ
c. 256 kJ
d. 56,903 kJ
Answer:
it is a
watch for kJ vs J as the enthalpy is in kJ and entropy is in J
Explanation:
Very long question but PLZ help
20. Calculate the hydrogen-ion concentration [H + ] for the aqueous solution in which [OH – ]
is 1 x 10 –11 mol/L. Is this solution acidic, basic, or neutral? Show your work. (3 points) Use
K w to solve for the hydrogen ion concentration here. Then, once you have your numerical
answer (with units!), answer the question about the solution.
Calculate the hydrogen-ion concentration (show all set up work with calculations) – (2 pts)
Discuss your answer and how it is related to the solution being acidic, basic or neutral and then
identify your solution as acidic, basic or neutral based on your calculated hydrogen-ion
concentration. – (1 pts)
Kw = [H+][OH-]
[OH] = 1.0 x 10^-11 M
Kw = 1.0 x 10^-14
[H+] = Kw/[OH-] = 1.0 x 10^-14 / 1.0 x 10^-11 = 1.0 x 10^-3 M
The solution is acidic, because [H+] > [OH-].
How many molecules in 4NH3
Answer:
16
Explanation:
4 nitrogen (N) atoms and 12 (3×4) atoms in Hydrogen (H)
Total = 4 + 12 = 16 molecules
Complete the following table based on known properties of ionic and covalent compounds.
Answer:
structure of KF - ionic
Explanation:
Sadiq repeated the experiment by adding sulphuric acid to magnesium carbonate. Write the word equation for this reaction below:
Answer:
Sulphuric acid + Magnesium Carbonate → Magnesium sulphate + carbon dioxide + water
Explanation:
Sulphuric acid + Magnesium Carbonate
The products are;
Magnesium sulphate, carbon dioxide and water
MgCO3 (s) + H2SO4 (aq) → MgSO4 (aq) + CO2 (g) + H2O (l)
Word Equation;
Sulphuric acid + Magnesium Carbonate → Magnesium sulphate + carbon dioxide + water
A chemist determined by measurements that 0.070 moles of barium participated in a chemical reaction. Calculate the mass of barium that participated in the chemical reaction.
Be sure your answer has the correct number of significant digits.
is sugar an element or a molecure or a molecure and a compound?
Answer:
Compound
Explanation:
Table sugar, or sucrose, is a compound because it's formed when two or more elements are joined together. Its chemical formula is C12H22O11, and it contains carbon, hydrogen and oxygen.
How much water is needed to prepare a .50 molal solution using 0.50 moles of sodium chloride??
The amount of water needed to prepare a 0.50 molal solution using 0.50 moles of sodium chloride is 1L.
How to calculate volume?The volume of a solution can be calculated using the following formula:
Volume = no of moles ÷ molarity
According to this question, 0.50 molal solution is used to prepare 0.50 moles of sodium chloride. The volume of the solution is calculated as follows:
Volume = 0.50 moles ÷ 0.5M
Volume = 1L
Therefore, the amount of water needed to prepare a 0.50 molal solution using 0.50 moles of sodium chloride is 1L.
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help ........,,,,.........
◆ Atomic mass of carbon (C) = 12g
◆ Atomic mass of oxygen (O) = 16g
No of moles of carbon (C) = 42.8/12= 3.57
No of moles of oxygen (O) = 57.1/16= 3.57
Simplest ratio :-
= 3.57 : 3.57
= 1 : 1
Empirical Formula = CO
The development of a nuclear power plant at an ocean site is expected to produce an enormous amount of electric power for a large population. Ocean water will be used to cool the plant and then returned to the ocean. What unintended consequences should be analyzed before starting construction?
Explanation: The awnser would be The effects of warmed water on aquatic life
Which of the four fundamental forces are involved in chemical bonding?
Answer:
The electromagnetic force is an important force in the chemical and biological sciences, as it is responsible for molecular connections like ionic bonding and hydrogen bonding.
the symbol for the element in period 2, group 13
Hey bedoorrr
Cheetosss
Answer:
this is really insightful, thank you
Explanation:
What color would red litmus paper turn in a solution of lime juice? Plz ans :(
Answer:
Stays redExplanation:
Red litmus + acid (lime) = stays red ✅
Red litmus + basic solution = blue
Blue litmus + acid (lime) = red
Blue litmus + basic solution = stays blue
________________
#Indonesian - kexcvi
What color would red litmus paper turn in a solution of lime juice?
Answer:Lime juice turns blue Litmus to Red so lemon juice is acidic in nature that is lime juice contains an acid. The most common indicator used for testing acids and bases in the laboratory is Litmus.Hopefully Help:)
#CarryOnLearning______ stays the same no matter what location you are in
Answer:
Mass
Explanation:
I think so
I NEED HELP PLEASE! (Made it worth A LOT of points!!!)
Selina is a scientist and is designing a portable water warmer that can help her warm up her samples while away from the lab. The device will store two chemicals separately. When she wants to warm up water, she will activate the device, which will mix the chemicals together to generate thermal energy. The thermal energy will increase the temperature of a container filled with water. Selina wants to find the best two chemicals that will generate energy in a safe and portable way. She starts by testing copper sulfate solution and zinc metal. She mixes these chemicals together in a beaker and records her observations in the table.
Time Observations
Before Combination: The copper sulfate solution is blue and zinc metal is a dull grey.
During Combination: Zinc Metal becomes dark and large amounts of thermal energy
is released.
After Combination: The Zinc is gone, a reddish-brownish residue remains, and the
solution is clear.
When copper sulfate and zinc metal interact, an atom of zinc replaces an atom of copper while the sulfate molecule, made of 5 atoms, is unchanged. How many atoms are there before and after the interaction? Select the correct answer choice.
Before: 5 atoms; after 6 atoms.
Before: 6 atoms; after 6 atoms
Before: 5 atoms; after 5 atoms
Before: 7 atoms; after 7 atoms
Answer:
the third one.
Explanation:
According to law of conservation of mass,before and after the reaction copper sulfate and zinc metal interact, an atom of zinc replaces an atom of copper while the sulfate molecule, made of 5 atoms, is unchanged. there are 5 atoms.
What is law of conservation of mass?
According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.
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A sample of gas has an initial volume of 15 L and an initial pressure of 4.5 atm. If the pressure changes to 1.8 atm, what is the new volume, assuming that the temperature remains constant?
Answer:
37.5 L
Explanation:
Initial Volume, V1 = 15L
Initial Pressure P1 = 4.5 atm
Final Pressure, P2 = 1.8 atm
Final Volume V2 = ?
The relationship between these variables is given as;
P1V1 = P2V2
V2 = PIV1 / P1
Inserting the values;
V2 = 4.5 * 15 / 1.8
V2 = 37.5 L
Answer: The new volume is 37.5L
Explanation:
The question is solved using the principle and formula of a gas law known as the Boyle's law. Boyle's law states that provided the temperature remains constant, the volume of a given mass of gas is inversely proportional to its pressure. Expressing the statement mathematically:
P ∝ 1/V, (where p is equal to pressure and V is volume)
Therefore PV = a constant
If a gas at pressure P1 and Volume V1 changes at constant temperature to pressure P2 and volume V2 then:
P1V1 = P2V2.
Using the formula to solve the question:
P1 = 4.5atm
P2 = 1.8atm
V1= 15L
V2 = ?
V2 = P1V1/P2
V2= 4.5 × 15 /1.8
V2 = 67.5/1.8
V2 = 37.5 L
Therefore the new volume is 37.5L