exactly 22.0 grams
because freezing is a physical change not a chemicl change..so nothing is taken away or added
ANSWER;
exactly 22.0 grams
because freezing is a physical change not a chemicl change..so nothing is taken away or added
1. Based on the two video clips on titration from the links provided earlier on the watsApp Group and a study master, carry out the following tests , a define the forms(i) titrant (2) Strand or analyte (3) Indicator (4) end point (5) titration. b. write in point form (list), the steps inolved in titration (including the relevant apparatus used) - write a typed Laboratory report for this assignment where there is no data to put in, include the relevant headings but without data. (For those who can attempt to do some calculations based the presentations, you are encouraged The report should be handed in when you open back to college
Answer:
1. Based on the two video clips on titration from the links provided earlier on the watsApp Group and a study master, carry out the following tests , a define the forms(i) titrant (2) Strand or analyte (3) Indicator (4) end point (5) titration. b. write in point form (list), the steps inolved in titration (including the relevant apparatus used) - write a typed Laboratory report for this assignment where there is no data to put in, include the relevant headings but without data. (For those who can attempt to do some calculations based the presentations, you are encouraged The report should be handed in when you open back to college
Explanation:
the answer is end point
gas which dissolve in ammonia copper(ii) chloride but insoluble in water is
Answer:
carbon monoxide
Explanation:
yes this is the answer
Carbon mono-oxide is the gas which dissolve in ammonia copper(ii) chloride but insoluble in water.
What is carbon mono-oxide?Carbon monoxide (CO) is just a toxic gas that is colorless and odorless. It is created when various fuels, such as coal, wood, charcoal, oil, kerosene, propane, as well as natural gas, are burned incompletely.
What is gas?
One of the four basic states of matter is gas. Individual atoms, elemental molecules created from one type of atom can make up a pure gas.
Therefore, carbon mono-oxide is the gas which dissolve in ammonia copper(ii) chloride but insoluble in water.
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Carbon dioxide gas is obtained from the fermentation of glucose. If 20.0 L of carbon
dioxide (at s.t.p) are collected, calculate the number of oxygen atoms present in this gas.
Answer:
5.48 x 10´23 atoms
Explanation:
Use PV = nRT
V = 20 L
R= constant = 0,08205746 L atm / (K mol)
stp means stantdard temperature and pression
T = 273 K
P = 0.987 atm
n = PV/RT = (0.987 atm) x (20 L) = 0.88 moles
(0,082 Latm/(K mol)x 273 K
0.88 moles x [tex]6.22 x 10^{23}[/tex] molecules = 5.48 x 10´23 atoms
How did you figure out the mass of each atom?
Answer:
Yeah, if you have the atomic number and neutron number
[tex]mass = protons + neutrons[/tex]
protons is the atomic number
How many elements have properties of both metals and non-metals?
Answer:
The elements boron, silicon, germanium, arsenic, antimony, and tellurium separate the metals from the nonmetals in the periodic table. These elements, called metalloids or sometimes semimetals, exhibit properties characteristic of both metals and nonmetals.
Elements: Oxygen
A block of wood has a length of 14 cm, a width of 12 cm and a height of 17 cm. What is it’s volume? If it’s density is 8.16 g cm^3 what is its mass?
Answer: volume = 2856
Mass = 6.410496 × 10-5 m3 kg
Explanation:
What is the safe way to dispose of an acidic solution
I'd say by Neutralization so as to make it Harmless.
Or
You Over dilute it with Water
Note: You pour the acid into water...Not water into acid as it may spill and burn your skin.
Answer: D
Explanation:
Carbohydrates make up 75% of the mass of dried plant material. Cotton is at least 95% carbohydrate. Why do humans not include cotton in their diet?
Answer:
the carbohydrates in cotton are mainly cellulose, but our body does not possess the proper enzymes to process cellulose, no we don't eat cotton on in our daily diet.
a. Phenol (C6H5OH) is an aromatic compound and a colourless liquid widely used in household products
and medicine. When it reacts with chlorine liquid (chlorine is a diatomic molecule), in the presence of a
catalyst, one of the aromatic hydrogen atoms attached directly to a C atom is replaced with a chlorine
atom, and liquid chlorophenol is formed. This replacement process is called chlorination
Write a balanced chemical equation for the chlorination reaction and explain how you balanced it. Note
that hydrogen chloride gas (HCI) is also a product of this chemical reaction and you should ignore the
presence of the catalyst in the equation.
Because there are 2 Cl on the left, we will put a coefficient 2in front of HCl on the right side to balance out the Cl. This would result in an unequal amount of H, with 6 on the right side and 7 in the left, so we have to put a coefficient of 2 in front of C6H5OH and C6H4OH on both sides to balance out the H. By doing this, we would obtain an equal amount of H on both sides. The Carbon is already balanced, and so is the Oxygen.
The balanced chemical reaction equation for the reaction between aromatic phenol and chlorine gas in the presence of FeCl3 as catalyst is as follows;
C6H6O + Cl2 -------> C6H5OCl + HCl
An aromatic compound has 4n + 2 number of pi electrons. This condition is satisfied by phenol. Hence, phenol has the stability associated with aromatic compounds.
The reaction of phenol with chlorine in the presence of a catalyst such as FeCl3 is an aromatic electrophillic substitution reaction.
This reaction yields a chlorinated phenol (one of the aromatic hydrogen atoms attached directly to a C atom is replaced with a chlorine atom and chlorophenol is formed).
A balanced chemical reaction equation is one in which the number of atoms of each element at the reactant side and the product side are equal. This condition is satisfied for the reaction;
C6H6O + Cl2 -------> C6H5OCl + HCl
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Name
maddison, M
Date
Vocabulary
Write the word next to the description it matches.
mixture
solubility
solution
1.
2.
the degree to which a material will dissolve in another
substance
different materials placed together but keeping their own
properties
a mixture in which substances are spread out evenly and
will not settle
3.
Okay
Answer:
solubility- the degree to which a material will dissolve in another substance
mixture- different materials placed together but keeping their own properties
solution- a mixture in which substances are spread out evenly and will not settle
7. In the experiment discussed in the passage, what is the variable?
Answer:
A variable is anything that can change or be changed. In other words, it is any factor that can be manipulated, controlled for, or measured in an experiment.
Which of the following salts are more soluble in acidic solution than in pure water?
(A) Al(OH)3,
(B) BaF2,
(C) PbCl2,
(D) Hg2Br2,
(E) NiS,
(F) AgI
The salts which are more soluble in acidic solution than in pure water are Al(OH)₃, BaF₂, PbCl₂ and Hg₂Br₂.
Which compounds will easily dissolve in acids?Those compounds which are basic in nature will easily dissolve in the acidic solution as compare to the pure water.
Al(OH)₃ is basic in nature due to the presence of hydroxide ions in it, so it gets easily soluble in the acidic solution.BaF₂ is also basic in nature as it is a salt of strong base, so it gets easily soluble in the acidic solution.PbCl₂ is moderate basic in nature as it is a salt of weak base and strong acid, so it is not easily soluble in the acidic solution.Hg₂Br₂ is also slightly basic in nature as it is a salt of weak base and strong acid, so it is not easily soluble in the acidic solution.NiS is not soluble in acidic solution because it shows acidic behavior as it a salt of very weak base.AgI is also not soluble in acidic solution because it shows acidic behavior as it a salt of strong acid.Hence Al(OH)₃, BaF₂, PbCl₂ and Hg₂Br₂ will soluble in acidic solution.
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Assuming equimolar quantities of reactants, which compound will react to the greatest extent with boron trifluoride (BF3) in a Lewis acid-base reaction
To solve such this we must know the concept of acid-base reaction. Therefore, NH[tex]_3[/tex] is the compound that will react to the greatest extent with boron trifluoride (BF[tex]_3[/tex]) in a Lewis acid-base reaction.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
NH[tex]_3[/tex] is an example of a Lewis Base that will react extensively with BF[tex]_3[/tex] to form the compound NH[tex]_3[/tex] + BF[tex]_3[/tex] → [B (NH[tex]_3[/tex])F[tex]_3[/tex]].
Therefore, NH[tex]_3[/tex] is the compound that will react to the greatest extent with boron trifluoride (BF[tex]_3[/tex]) in a Lewis acid-base reaction.
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I need 100 ml of a 20 uM solution of a protein with a molecular weight of 50,000. How much protein do I need
I need 0.1g of protein
HOW TO CALCULATE NUMBER OF MOLES?
The number of moles of a substance in a solution can be calculated by multiplying the volume by the molarity of the solution i.e.no of moles (n) = Molarity (M) × Volume (V)
In this question, 100 ml of a 20 uM solution of a protein was given.
Since 1uM = 10^-6M
20uM = 20 × 10-⁶
= 2 × 10-⁵M
1L = 1000ml
100mL = 100/1000
= 0.1L
no of moles = 2 × 10-⁵M × 0.1L
no of moles = 2 × 10-⁶mol
HOW TO CALCULATE MASS:
Mass of a substance can be calculated by multiplying the molar mass and the number of moles i.e.Mass = moles × Molar mass
Molecular mass of protein = 50,000g/mol
Mass = 2 × 10-⁶mol × 50000g/mol
Mass = 0.1g
Therefore, 0.1gram of protein is needed
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Molarity of a solution is simply defined as the mole of solute per unit litre of water.
Mathematically, it is expressed as:
[tex]Molaity = \frac{Mole }{Volume }[/tex]
With the above information in mind, we can determine the amount of the protein needed as follow:
Step 1:Data obtained from the question
Volume = 100 mL
Molarity = 20 μM = 20×10¯⁶ M
Molecular weight of protein = 50000 g/mol
Mass of protein=?Step 2Conversion of 100 mL to litre (L).
1000 mL = 1 L
Therefore,
[tex]100 mL = \frac{100 mL * 1 L}{100 mL }\\\\100 mL = 0.1 L[/tex]
Step 3Determination of the mole of the protein
Volume = 0.1 L
Molarity = 20×10¯⁶ M
Mole of protein =?Mole = Molarity × Volume
Mole of protein = 20×10¯⁶ × 0.1
Mole of protein = 2×10¯⁶ mole Step 4Determination of the mass of the protein
Mole of protein = 2×10¯⁶ mole
Molecular weight of protein = 50000 g/mol
Mass of protein =?Mass = mole × molar mass
Mass of protein = 2×10¯⁶ × 50000
Mass of protein = 0.1 gTherefore, the amount of the protein needed is 0.1 g
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25 mL of 0.010 M I- solution is mixed with another solution to give a new total volume of 60 mL. What is the molarity of I- after mixing
Answer:
the answer of this question is 0.0041M
Why does the temperature stop rising while ice melts into water?
A. Because no more heat is being added to the system.
B. The temperature does not stop rising.
C. The electrons are increasing in energy levels.
D. The energy is being absorbed to separate the particles
Please please help with #19 part a., b., and c.!! it’s due on monday and i am not terribly good at chemistry. if you could also give an elementary explanation that would be great too!
A. 0.2 mole of HCl is needed for the reaction
B. The molarity of NaOH solution is 0.04 M
C. The molarity of HCl is 0.043 M
Molarity is defined as the mole of solute per unit litre of the solution.
Molarity = mole / Volume A. Determination of the mole of HCl.We'll begin by calculating the number of mole of NaOH in the solution.
Volume = 0.1 L
Molarity of NaOH = 2 M
Mole of NaOH =?Mole = Molarity x Volume
Mole of NaOH = 2 × 0.1
Mole of NaOH = 0.2 moleFinally, we shall determine mole of HCl.
HCl + NaOH —> NaCl + H₂O
From the balanced equation above,
1 mole of NaOH required 1 mole of HCl.
Therefore, 0.2 mole of NaOH will also require 0.2 mole of HCl.
Thus, 0.2 mole of HCl is needed for the reaction.
B. Determination of the molarity of NaOH.HCl + NaOH —> NaCl + H₂O
From the balanced equation,
Mole ratio of the acid, HCl (nA) = 1
Mole ratio of the base, NaOH (nB) = 1
From the question given above above,
Volume of acid, HCl (Va) = 0.025 L
Molarity of acid, HCl (Ma) = 0.05 M
Volume of base, NaOH (Vb) = 0.034 L
Molarity of base, NaOH (Mb) =?Mava / mbvb = na/nb
0.05 x 0.025 / Mb x 0.034 = 1
0.00125 / Mb x 0.034 = 1
Cross multiply
Mb x 0.034 = 0.00125
Divide both side by 0.034
Mb = 0.00125 / 0.034
Mb = 0.04 M
Therefore, the molarity of NaOH is 0.04 M
C. Determination of the molarity of the HClFrom the question given above above,
Volume of base, NaOH (Vb) = 0.054 L
Molarity of base, NaOH (Mb) = 0.1 M
Volume of acid, HCl (Va) = 0.125 L
Mole ratio of the acid, HCl (nA) = 1
Mole ratio of the base, NaOH (nB) = 1
Molarity of acid, HCl (Ma) =?Mava / mbvb = na/nb
Ma x 0.125 / 0.1 x 0.054 = 1
Ma x 0.125 / 0.0054 = 1
Cross multiply
Ma × 0.125 = 0.0054
Divide both side by 0.125
Ma = 0.0054/0.125
Ma = 0.043 MTherefore, the molarity of the HCl is 0.043 M
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What was the variable that Sunil changed in his experiment?
Explanation:
The things that are changing in an experiment called variables. A variables is any factor , trail , or condition that can exist in differing amounts or types. The independent variables is the one that is changed by the scientist. Why just one? well, if you changed more than one variables it would be hard to fight out which be hard to fight out which change is causing what you observe . For example, what if our scientists question was:" how does the size of a dag affect how much ismts eats?" then, during your feeding experiment you changed both the size of the dog and the time of day the dags were fed.
Bio-Clemical reactions talking Place in every Cell organelles
Answer:
Each of these organelles performs a specific function critical to the cell's survival. For example, biochemical reactions in a cell's mitochondria transfer energy from fatty acids and pyruvate molecules into an energy-rich molecule called adenosine triphosphate (ATP).
Explanation:
Draw the keto and enol forms of 3,3-dimethylbutan-2-one, circle the more stable tautomer, and propose a mechanism for the conversion of one tautomer to the other in acidic conditions.
Please help thank you (15 points)
Answer:
Jupiter.
Explanation:
Jupiter has the fastest axial rotation time (day) in the list of answers, based on the fact that its day is only 10 hours long.
The specific gravity of a vegetable oil is 0.92. What is the massgrams, of 330 mL of vegetable oil?
Answer:
HOPE THIS ANSWER WILL HELP YOU
Class 8 chemistry : metals and non metals describe the process of formation of coal in the nature
Explanation:
Coal is formed when dead plantand animals matter decays into peat and is converted into coal by the heat and pressure of deep burial over millions of years.
a test tube containing liquid x is placed in a beamer of boiling water. the liquid starts to boil immediately. what is the boiling point of liquid x?
a) 100 celsius
b) above 100
c) between 0 and room temperature
d) between room temperature and 100 celsius
Answer:
100 Celsius
Explanation:
(I'm not sure if this is right but I'm confident this is the answer)
15. Which portion of a molecule of F20 has partial positive charge?
A. The central O atom
ОО
B. The partial charge on each atom is negative
C. The partial charge on each atom is zero
D. The F atoms
Answer:
the right answer is option A
Answer:
a.the central o atom oo
Explanation:
wala lang
HELP PLEASE WILL MARK BRAINLIEST!!!!!!!
Answer:
Precise
Explanation:
hope it helps!!!!!!!!
Will give brainliest
Answer:
D
Explanation:
hi
good morning
I hope right answer
Students in Mr. Brant's class designed an experiment to test which baseball bat will hit the ball the longest distance? In this experiment what is the test variable?
A . The distance the ball traveled
B. The students in the class
C. The type of baseball bat
D. A baseball helmet
what is x if x - 2 =0
Answer:
x-2 = 0
x = 2
hope this was help full
solve for x . 4x-300=-8×
Answer:
4x+8x=30
12x=300
x=300/12
x=25