Answer:
1)A moth bursting out of a cocoon is neither a chemical or physical change, it's a biological change. If I had to chose it would be a physical change though. Not to sure...
2)Playing with slime is a physical change.
Explanation:
1)The reason why I would chose physical change is because the moth is changing it's physical state more than it's chemical composition, but you should say both if that's an option.
2)A physical change is when the temperature, shape, or state of matter changes. A chemical change occurs when the actual substance changes. An example of this is a chemical reaction. Because the slime is changing shape and not substances, I would say that it's obviously a physical change.
Hope this helps, sorry that I'm not too sure about the 1st question.
Consider the following reactions:
3 Ni 2+(aq) + 2Cr(OH)3 (s) + 10 OH –(aq) → 3 Ni (s) + 2 CrO4 –2 (aq) + 8 H2O (l)
A) What is the value for n for this reactions?
B) Calculate the standard Gibbs Free-Energy
C) How long does it take a current of 5 A to deposit 95 g of nickel?
For the reaction
3 Ni2+(aq) + 2 Cr(OH)3(s) + 10 OH- (aq) → 3 Ni(s) + 2 CrO42-(aq) + 8 H2O(l) G = +87 kJ/mol
Given:
(Ni2+(aq) + 2 e- → Ni(s)) x 3 Ered = -0.28 V
(CrO42-(aq) + 4 H2O(l) + 3 e- → Cr(OH)3(s) + 5 OH-(aq)) x 2
_____________________________________________________________________________________
3 Ni2+(aq) + 6 e- → 3 Ni(s)
2 CrO42-(aq) + 8 H2O(l) + 6 e- → 2 Cr(OH)3(s) + 10 OH-(aq)
answer 3 questions. screenshot
Which part of the pencil is conductors?
A. The metal and point
B. The eraser and point
C. The wood and eraser
D. the wood and metal
Answer:
A. The metal and point
Explanation:
Elements that can conduct electric current are generally metals. However, the nonmetal carbon in the form of graphite is a good conductor of electricity.
AcipHex is classified as
Answer:
Rabeprazole belongs to a class of drugs known as proton pump inhibitors (PPIs).
Answer question based on the periodic table entry for bromine.
How many protons does bromine have?
a. 35
b. 36
c. 45
d. 80
what would be the best way to determine the amount of AgNO3 in the dissolved solution? Justify your answer
The best way to determine the concentration of AgNO3 dissolved in solution is by precipitation using a chloride.
Precipitation is one of the oldest and handy methods of chemical analysis. It involves the addition of a reagent which is known to form a precipitate with the test solution.
The precipitate is now recovered from solution, dried and weighed. Stoichiometric calculations show the amount of the test substance dissolved in the test solution.
In this case, NaCl can be used to carry out a precipitation as follows;
AgNO3(aq) + NaCl(aq) -------> AgCl(s) + NaNO3(aq)
The AgCl precipitate is recovered dried and weighed and then the amount of AgNO3 in the dissolved solution is determined.
Learn more: https://brainly.com/question/25292604
There are 6.02 x 10 ^ 23 atoms of carbon per 12 grams. How many atoms of carbon per pound are there?
Considering the change of units, there are 2.27×10²⁵ atoms of carbon per pound.
You know that there are 6.02x 10²³ atoms of carbon per 12 grams.
On the other hand, you must make a change of units. For that you must know that 1 gram equals 0.00220462 pounds. Then you can apply the following rule of three: if 1 gram is equal to 0.00220462 pounds, 12 grams is equal to how many pounds?
[tex]mass=\frac{12 gramsx0.00220462 pounds}{1 gram}[/tex]
mass= 0.0264555 pounds
12 grams equals 0.0264555 pounds. So if 12 grams contains 6.02x 10²³ atoms, 0.0264555 pounds contains that many moles. Then you can apply the following rule of three: if 0.0264555 pounds contains 6.02x 10²³ atoms, does 1 pound contain how many atoms?
[tex]amount of atoms=\frac{1 poundx6.02x10^{23} atoms}{0.0264555 pounds}[/tex]
amount of atoms= 2.27×10²⁵ atoms
Finally, there are 2.27×10²⁵ atoms of carbon per pound.
Learn more:
https://brainly.com/question/17353696?referrer=searchResults2. Calculate the number of moles of NaOH needed to make 300 mL of 6 M solution?
Answer:
1.8 mol
Explanation:
concentration (M) = no. of moles (mol) ÷ volume (dm³)
no. of moles = concentration × volume
= 6 × 300 / 1000
= 1.8 mol
How to write the molecular equation of the following reaction. Also, identify the net ionic equation, the total ionic ecuation and the species that gets reduced and oxidized.
NaHCO3(ac) + HCl(ac)
Answer:
a. HCl + KOH
b. HCHO₂ + LiOH
Only the first H in HCHO₂ is acidic
c. N₂H₄ + HCl
Both N atoms in N₂H₄ are basic, so the compound reacts with 2 mol of HCl.
Explanation:
What evidence supports the theory of continental drift? Select three.
Question 10 options:
Fossils of plants and animals
Distinctive rock layers and mountain ranges
Glacial scratches on rocks
Volcanic activity along the Ring of Fire
Answer:
fossils of plants and animals
distinctive rock layers and mountain ranges
Glacial scratches on rocks
Explanation: I took the quiz lol
How many ML of 0.44 M HCl are needed to dissolve 9.83 g of BaCO3
Answer:
nBACO3=m/M=9,83/197=0,05(mol) ->nHCl=0,05.2/1=0,1(mol) =>VHCl=n/CM=0,1/0,44=0,227(lít)
Explanation:
white sugar and iodized salt did the resulting look same throughout?
Because White sugar settles at the bottom of iodized salt. White sugar completely mixed with iodized salt.
In the Periodic Table, which of the highlighted elements has the greatest number of protons?
A Fluorine, F
B Iron, Fe
C Calcium, Ca
D Aluminum, AI
Answer:
since the modern periodic table is made in ascending order by the atomic number fluorine has the most protons.
The highlighted element that has the greatest number of protons is Iron, Fe. Thus, the correct option for this question is B.
What do you mean by Protons?Protons may be defined as a type of subatomic particles which are generally present in the centermost part of an atom known as the nucleus along with neutrons. These subatomic particles are positively charged in nature. Ernest Rutherford was known to discover these particles.
According to the question, the number of protons is generally governed by an atomic number of a chemical element. For example, fluorine has an atomic number of 9. It has the same number of protons in its nucleus. The number of protons in Iron is 26, while the number of protons in Calcium is 20. And the number of protons in aluminum is 13.
Therefore, an iron is the highlighted element that has the greatest number of protons. Thus, the correct option for this question is B.
To learn more about Protons and atomic numbers, refer to the link:
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#SPJ2
Which of the following correctly orders the
events in atomic history?
A. The atom has a small dense positive
nucleus.
B. The atom was a small dense sphere
C.Electrons exist in orbitals, or the most
probable location
D. The atom at electrons stuck in an overall
positive atom
E. Electrons exist in perfect orbits based on
energy levels.
The history of the atom passed through a certain sequence until our recent interpretation of atomic theory.
The correct sequence of atomic theory is;
The atom at electrons stuck in an overall positive atomThe atom has a small dense positive nucleus. Electrons exist in perfect orbits based on energy levels.Electrons exist in orbitals, or the most probable locationThe beginning of the atomic theory saw the discovery of J.J Thompson which led to the plum - pudding model in which the atom was described as a sphere in which electrons are stuck in an overall positive atom.
This was followed by Rutherford's planetary model in which he concluded that the atom has a small dense positive nucleus. This was followed by the model of Bohr in which the electrons exist in perfect orbits based on energy levels.
Lastly, the contemporary model of the atom is called the wave - mechanical model in which electrons exist in orbitals, or the most probable location.
Learn more: https://brainly.com/question/14156701
Why has the acidity of the ocean increased over the years?
A.Sediment deposits cannot replenish quick enough in order to affect the acidity
B.Not enough basic solutions in the ocean
C. Waste from ocean life
Answer:
I think it's A
Explanation:
Carbon dioxide is added to the atmosphere whenever people burn fossil fuels. ... As the amount of carbon dioxide in the atmosphere rises, the oceans absorb a lot of it. In the ocean, carbon dioxide reacts with seawater to form carbonic acid. This causes the acidity of seawater to increase.
What benefits does the food industry gets from catalysts?
Check all of the following that are mixtures.
A) Water
B) Iron
C) Milk
D)Trail mix
Kaya is riding her dirt bike eastward on a dirt road. She spots a pothole ahead. Kaya slows from 20.0 m/s to 6 m/s in 6.0 s. What is her acceleration?
[tex]\\ \sf\longmapsto Acceleration=\dfrac{v-u}{t}[/tex]
[tex]\\ \sf\longmapsto Acceleration=\dfrac{6-20}{6}[/tex]
[tex]\\ \sf\longmapsto Acceleration=\dfrac{-14}{6}[/tex]
[tex]\\ \sf\longmapsto Acceleration=-2.3m/s^2[/tex]
What structure
do plant cells have during
cytokinesis that animal cells
do not have?
Answer: See Explanation
Explanation:
Cytokinesis occurs in mitosis and meiosis for both plant and animal cells. The ultimate objective is to divide the parent cell into daughter cells.
In plants , this occurs when a cell wall forms in between the daughter cells.
In animals , this occurs when a cleavage furrow forms. This pinches the cell in half.
Some changes in matter may results to 1. _ or 2._ effects in the environment. We have to do our share in maintaining 3. environment. We must 4. too much use of electricity and gasoline. We must also avoid 5. rubber tires and plastics. We must avoid practices that will produce acid rain, increase global temperature, or deplete the ozone layer. pls i need answers
Answer:
C
Explanation:
PLEASE MARK AS BRAINLIEST!!!!!can u help me with this i confused with this
Answer:
your creating a animal/creature
Explanation:
a human is a mammal we grow use energy reproduce and change our clothes to respond to our surroundings
How many grams of O are in 705 g of N2O ?
mass:
g
Answer:
O are in 535 g of N2O
Explanation:
Under what circumstances may a health insurer charge a higher premium to a woman with a genetic disposition to breast cancer? a) Her mother has breast cancer but she doesn't. O b) She has breast cancer. c) Her sister has breast cancer but she doesn't. d) Health insurers can never discriminate based on genetic information in this way.
Answer:
D
Explanation:
No company is allowed to discriminate.
What state of matter is foam?
Answer:
Foam is not a state of matter, it is a mixture of two states: gas and (usually) liquid. There are also gas-solid foams.Explanation:
Answer:
Foam is not a state of matter, it is a mixture of two states: gas and (usually) liquid.
Explanation:
Atomic Theory questions. Will be worth 50 points.
Answer:
1. Option C
2. Option D
3. Option B
4. Option
5. Option
6. Option
7. Option
how do you expect the size of the atoms to change as you go from neon to argon to krypton
Answer:
The number of energy levels will increase.
Explanation:
As they are all Noble Gases, they are all in the same family. However, as you go further down the list of Noble Gases, the period number increases. The period number shows the number of energy levels. Hence, an increase in energy levels.
The size of the atoms (atomic radius) would increase down the group from neon to argon to krypton.
What is atomic radius?Atomic radius can be defined as a measure of the size (distance) of the atom of a chemical element, typically from the nucleus to its valence electrons.
The trends of atomic radius.Generally, the atomic radius of a chemical element decreases across the periodic table, from alkali metals (group 1 elements) to noble gases (group 8 elements). Also, the atomic radius of a chemical element increases down each group of the periodic table, typically from top to bottom (column).
In this context, the size of the atoms (atomic radius) would increase down the group from neon to argon to krypton.
Read more on atomic radius here: https://brainly.com/question/19581295
Explain how a density current might form in the Arctic Ocean
they are caused by winds and changes in seawater density.
C.5A What atom is shown below? *
8 points
19 p
20 n
Cholrine
Argon
Calcium
Potassium
Answer:
p stands for protons. You can identify the element by matching the atomic number with the number of protons.
The answer is Potassium in this case.
can you describe a carbon atoms for me please
thank you
what if two objects have the same mass but different sizes which is denser? expain
Answer:
Imagine you have 5 marbles in your hand and 5 marbles spread in front of you on the floor. Each group has the same mass, but one is contained in a smaller space. The marbles in your hand would be denser because there is more "stuff" in a smaller space.
Explanation: