Glycerine is known as a negative catalyst.why?
Answer:
The presence of 1-2% ethanol as catalyst, suppresses the oxidation of chloroform with oxygen to give a poisonous gas called phosgene. ... Here glycerol acts as negative catalyst. Criteria or characteristics of catalysts. i. The mass and chemical composition of catalyst should remain unchanged at the end of the reaction.
Explanation:
What do the results tell you about your hypothesis(es)? How do the data support your claim above?
Answer: It tells you if your hyposthesis was incorrect or correct from the data. The data supports this because you tested and got your results correctly which will help you to form a hypothesis.
Explanation:
Answer:
It tells you if your hyposthesis was incorrect or correct from the data. The data supports this because you tested and got your results correctly which will help you to form a hypothesis.
Explanation: its right trust me
explain the impact of water cycle to humans. I couldnt find the subject science so it science
Answer:
we get rain and the water cycle grows our plants too
Explanation:
I really need help with this ASAP
Answer:
1) Reaction rate, in chemistry, the speed at which a chemical reaction proceeds. It is often expressed in terms of either the concentration (amount per unit volume) of a product that is formed in a unit of time or the concentration of a reactant that is consumed in a unit of time.
2) By collecting the hydrogen gas that is produced over water or in a syringe, rate graphs can be produced. The volume of gas produced and the time taken need to be recorded. The rate of the same reaction could be monitored by measuring the change in the mass of reactants as they react to form products.
How do the elements in each group differ? How are they similar?
Explanation:
All the elements in one group have the same number of valence electrons. The valence electrons are those on the energy level the most distant from the nucleus. These valence electrons are those involved in bonding with other atoms to form compounds.
In the periodic table elements in the same group posses similar physical and chemical property and this is due to the similarity in the number of valence electrons found in their valence shells.
While in the periodic table as we move down a group the atomic number of the elements will continue to increase because elements in the same group are located in different periods as well.
Hence we can conclude that the difference in the elements located in a group is that they have different atomic numbers while the similarities is that the posses the same number of valence electrons.
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How does the mass of an oxygen nucleus
compare to the mass of the 8 protons and
8 neutrons that make up the nucleus?
Answer: The mass of the nucleus is less than the mass of the 8 protons and 8 neutrons.
Explanation:
is Sc2S3 polar or non polar or ionic
Answer: Ionic
Explanation:
SOMEONE HELP ME PLS!!!!
When salt is added to water, the entropy, S,
of the system can be described by an
inequality.
Ssolution > Swaler + Ssalt
According to the inequality, what increases
when salt is added to the water?
A. Internal energy
B. state of disorder
C. number of particles
D. strength of attraction between particles
Answer:
C. number of particles
Explanation:
Entropy is the measure of disorderliness of a system. Remember that when you dissolve salt in water, you increase the number of particles in the solution. The greater the number of particles in solution, the greater the entropy of the solution system.
Hence dissolution of a salt in water increases the entropy by increasing the number of particles in solution leading to the inequality; Ssolution > Swater + Ssalt.
A mole is blank objects
Answer:
Well what I found was that this was this answer
Explanation:
A mole is 6.022 x 1023 objects of any kind - atoms, electrons, molecules, cars, people, etc... . It is known as Avogadro's number after the scientist who discovered ... Blah blah I think you get it.
Which Group 2A element would you expect to be the most reactive?
beryllium (Be)
calcium (Ca)
barium (Ba)
radium (Ra)
Answer:
Calcium
Explanation:
It has the largest atom
PLEASE HELP ASAPP!!!!!!!!!!!!!!!!!!!!!!!! TIMED TEST!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!A man pushes a box with a force of 75.0 N across a 12.0 m loading dock. How much work did he do on the box? (Use formula W = F x d)
Answer:
Answer:
Work done, W = 900 joules
Explanation:
It is given that,
Force acting on the man, F = 75 N
Distance, d = 12 m
We need to find the work done by the man on the box. Let it is given by W. The work done of an object is equal to the product of force and distance. Mathematically, it can be calculated as :
W = F × d
W=75\ N\times 12\ mW=75 N×12 m
W = 900 joules
So, the work done by the man on the box is 900 joules. Hence, this is the required solution.
hope it is helpful
Which of these is the correct Lewis dot structure for LiCl.
Help me with my Science assignment please its graded.
Answer:
i think use water displacement with just one 10c
Explanation:
What’s the definition of renewable energy
Answer:
energy from a source that is not depleted when used, such as wind or solar power.
Explanation:
Explanation:
renewable energy is energy from a source that is not depleted when used such as wind or solar power.
Hope this helps :)
How many atoms are in this iron nail?
Answer:
The atomic mass of iron (Fe) is 55.85 amu. The atomic mass of radium (Ra) is 226 amu. One mole of atoms of any element contains 6.022 X 1023 atoms, regardless of the type of element.
Iron (Fe) has an atomic mass of 55.845 g/mol. So if you have 13.2 grams, you have 13.2/55.845 mol = 0.2364 moles.
Hope this helps!
Explanation:
A student uses visible spectrophotometry to determine the concentration of CoCl2(aq) in a sample solution. First the student prepares a set of CoCl2(aq) solutions of known concentration. Then the student uses a spectrophotometer to determine the absorbance of each of the standard solutions at a wavelength of 510nm and constructs a standard curve. Finally, the student determines the absorbance of the sample of unknown concentration.
The original solution used to make the solutions for the standard curve was prepared by dissolving 2.60g of CoCl2 (molar mass 130.g/mol) in enough water to make 100.mL of solution. What is the molar concentration of the solution?
A) 0.200 mol
B) 0.500 mol
C) 1.00 mol
D) 5.00 mol
Answer:
A
Explanation:
2.60 g of CoCl2 was dissolved in water to make 100 mL of solution.
Number of moles of CoCl2 dissolved = mass/molar mass
= 2.60/130
= 0.02 mole
Molar concentration of solutions = number of moles/volume (dm3)
= 0.02/0.1
= 0.200 M
Hence, the molar concentration of thesolution is 0.200 molar.
Correct option = A
A student prepared a solution used to make the solutions for the standard curve by dissolving 2.60g of CoCl₂ (molar mass 130. g/mol) in enough water to make 100. mL of solution. The molar concentration of the solution is 2.00 M.
First, we will convert 2.60 g to moles of CoCl₂ using its molar mass (130. g/mol) as the conversion factor.
[tex]2.60 g \times \frac{1mol}{130. g} = 0.0200 mol[/tex]
0.0200 moles of CoCl₂ are in 100. mL (0.100 L) of solution. The molar concentration of the solution is:
[tex]M = \frac{0.200 mol}{0.100 L} = 2.00 M[/tex]
A student prepared a solution used to make the solutions for the standard curve by dissolving 2.60g of CoCl₂ (molar mass 130. g/mol) in enough water to make 100. mL of solution. The molar concentration of the solution is 2.00 M.
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Why is sublimation such a critical component for the water cycle in cold climates?
Answer:
Sublimation is a critical component for the water cycle in cold climates where water in the solid form or ice is prevalent because sublimation which is the transformation of a solid substance to a liquid without passing through the liquid phase including when ice transforms directly into vapors, readily takes place when the relative humidity is low and the wind is dry, which are conditions that can be found combined mainly in cold climates
Explanation:
The density of alcohol is found to be 0.772 g/mL (true value is 0.798 g/mL)
m=d/g
m=0.772/9.8
m=0.0787755102
now,
d=m/v
0.772=0.0787755102/v
v=
The number that represents a neutral pH is _______.
Numerical Answers Expected!
Answer for Blank 1: _______________
Answer:
7
Explanation:
the number that represents a neutral pH is 7
Answer:
7
Explanation:
The neutral p H like Water is 7.
The smallest particle of an element that retains the properties of that element is a(n) ____. a. atom c. proton b. electron d. neutron
Answer: proton
Explanation:
They are what give an atom it’s identity
How many atoms are in 3.2 moles of KCl? (show work if you can plz)
Answer:
I really hope this helped❤
Explanation:
welll, in chemistry and physics, the Avogardo constant is the number of constituent particles, usually atoms or molecules that are contained in the amount of substance given by one mole and is equal to 6.02 × 10**23. so 3 moles of carbon atoms would be 18.06 × 10**23.
How do we represent a shared pair of electrons when drawing the Lewis structure of a covalent bond
Answer:
Please mark as Brainliest!!
Explanation:
The former, known as a 'Lewis dot diagram,' indicates a pair of shared electrons between the atomic symbols, while the latter, known as a 'Lewis structure,' uses a dash to indicate the pair of shared electrons that form a covalent bond. More complicated molecules are depicted this way as well.
what are all the ways you can change a piece of binder paper?
Answer:
you can burn it.
Explanation:
that is the way to change paper
Identify 5 properties of matter that you encounter every day. Be detailed in your explanation.
Answer:To proceed scientifically, you could measure several properties of the unknown liquid and compare them with the properties of known substances. You might observe and measure such properties as color, odor, texture, density, boiling point, and freezing point.
Explanation:
PLEASE HELP!!!!!
What role do chemical processes play in the operation of the flashlight?
How many molecules are there in 5H20?
A.5
B.7
C.10
D.11
Compared to H2S, the higher boiling point of H2O is due to the
1.
greater molecular size of water
2.
stronger hydrogen bonding in water
3.
higher molarity of water
4.
larger gram-formula mass of water
Answer:
2, stronger hydrogen bonding
Explanation:
[tex]\rm H_2O[/tex] has higher boiling point than [tex]\rm H_2S[/tex], as there has been stronger hydrogen bonding in [tex]\rm H_2O[/tex]. Thus, option 2 is correct.
The boiling point has been the temperature at which the liquid has been converted to the gaseous form. The boiling point has been based on the intemolecular attractions between the atoms.
Higher boiling pointBased on the intermolecular interactions, the compound with higher intermolecular force required more energy to break the bond and change the state, and thus have high boiling point.
The hydrogen sulfide and water has hydrogen bonding. The hydrogen bonding has been based on the electronegativity of the atom involved. The more electronegative atom, stronger will be hydrogen bonding and thereby higher boiling point.
In [tex]\rm H_2S[/tex] and [tex]\rm H_2O[/tex], the oxygen has been more electronegative than sulfur and thus results in stronger hydrogen bonding.
Thus, [tex]\rm H_2O[/tex] has higher boiling point than [tex]\rm H_2S[/tex], as there has been stronger hydrogen bonding in [tex]\rm H_2O[/tex]. Thus, option 2 is correct.
Learn more about boiling point here:
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g Identify the true statements regarding α-1,6 linkages in glycogen. At least four glucose residues separate α‑1,6 linkages. The number of sites for enzyme action on a glycogen molecule is increased through α‑1,6 linkages. New α‑1,6 linkages can only form if the branch has a free reducing end. The reaction that forms α-1,6 linkages is catalyzed by a branching enzyme. Exactly four residues extend from these linkages.
Answer:
At least four glucose residues separate α‑1,6 linkages.
The number of sites for enzyme action on a glycogen molecule is increased through α‑1,6 linkages.
The reaction that forms α-1,6 linkages is catalyzed by a branching enzyme.
Explanation:
Glycogen is a polymer of glucose and is the primary carbohydrate storage form in animals. The polymer is composed of glucose units linked in alpha(1-4) straight chains and alpha(1-6) branches which occur on average every 8-12 straight chain glucose residues. It has a reducing and non-reducing end. The end of the molecule containing a free carbon number one on glucose is called a reducing end. The other ends are all called non-reducing ends.
During the breakdown of glycogen, glucose units are removed one at a time from the non-reducing end until a point about four glucose residues away from a branch which will require a debranching enzyme to act for further breakdown to occur. Since many such branches occur in a glycogen molecule, it makes it possible for breakdown of glycogen to occur at many points speedily.
Glycogen branching enzyme is required to make alpha (1-6) glycosidic bonds. It transfers 6 to 7 glucose units from the non-reducing end of a straight chain glycogen molecule to an interior position of the same or another glycogen molecule forming alpha (1-6) bonds.
Which of the following best illustrates the law of corkervation of energy?
A
The work done stretching a spring is transformed into stored energy in the spring
B
Leak-proof batteries are able to store chemical energy for long periods of time.
С
Ajogger conserves her energy by reducing the rate at which she jogs.
D
Ice water changes into liquid water when it absorbs heat energy.
Answer:
A . The work done stretching a spring is transformed into stored energy in the spring
Explanation:
The work done stretching a spring is transformed into stored energy in the spring is clear indication of the law of conservation of energy.
The law of conservation of energy states that "energy is neither created nor destroyed but transformed from one form to another".
In this problem, mechanical energy is used to stretch the spring. The mechanical energy is converted to stored potential energy.This is an energy transformation process.