Answer:
The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so quantity can neither be added nor be removed.
Explanation:
Your answer should be- that in a chemical reaction mass is neither created nor destroyed.
Explanation:
Is that good?
What would be the pH after mixing!!
i need help ' please
Answer:
s orbitals - spherical shape
p orbitals - dumbbell shape
d orbitals- dxy, dyz , dzx -double dumbbell
- dx²-y²- double dumbbell (along axis)
-dz² -dumbbell with electron cloud
( along the axis)
therefore here the answer is 2s and 3s
One of the pieces of evidence supporting energy quantization was the line spectra of elements. Why does this demonstrate energy quantization?
a) Photons are packets of energy that act both as a particle and a wave.
b) The spectra is continuous and shows emission at all wavelengths.
c) There are sharp emission lines demonstrating discrete energy levels.
d) All compounds emit light in the ultraviolet and visible regions specifically.
Answer:
c) There are sharp emission lines demonstrating discrete energy levels.
Explanation:
When an element emits energy in the form of radiation, it produces a spectrum of colors on a photographic plate. This spectrum can either be continuous or discrete. In continuous spectrum the spectrum continues without any discrimination between two regions. This represents the continuous emission of radiation, and thus the continuous emission of energy without any break.
On the other hand, the line spectrum consists of discrete and sharp lines, which shows the emission of radiation in a certain amount in a certain time, with a break between emission. Hence, the line spectra supports the quantization of energy.
The correct option is:
c) There are sharp emission lines demonstrating discrete energy levels.
A sample has a PH of 4, and another sample has a PH of 9. Which sub is the base? How many times basic is it??
Answer:
the first one
Explanation:
the first one is the base because it has a lower PH
A student dissolved a 0.139g sample of oxalic acid, H2C2O4, in water in an Erlenmeyer flask. Then the student titrated the H2C2O4 solution in the flask with a solution of KMnO4, which has a dark purple color. The balanced chemical equation for the reaction that occurred during the titration is shown above. (a) Identify the species that was reduced in the titration reaction. Justify your answer in terms of oxidation numbers.
Answer:
MnO4 − was reduced
C2 O4^2- was oxidized
Explanation:
2MnO4 −(aq) +5H +(aq) +2 C2 O4^2-(aq) +6H+(aq) →2Mn2+(aq) + 10CO2(g) +8H2 O(l)
A redox reaction is characterized by a change in the oxidation number of reacting species from left to right in the reaction equation.
If we look at Manganese, its oxidation number was decreased from +7 on the left hand side to +2 on the right hand side. This implies that it gained five electrons. recall that reduction refers to electron gain.
If we look at carbon, its oxidation number increased from +3 on the left hand side to +4 on the right hand side. This indicates loss of one electron and oxidation refers to electron loss.
MnO₄⁻ was reduced and C₂O₄²⁻ was oxidized in the titration.
The balanced chemical equation for the reaction can be expressed as:
[tex]\mathbf{6H^+_{(aq0} + 2MnO_4^-_{(aq)} + 5H_2C_2O_4 _{(aq)} \to 10CO_{2(g)} +8H_2O_{(l)} + 2Mn^{2+}_{(aq)}}[/tex]
A redox reaction can be described by a variation in the oxidation number of reacting species in the chemical reaction equation from the reactant side to the product side
Oxidation takes place when a substance(atom, molecule, or compound) loses an electronReduction occurs when a substance gains an electron.Let consider Mn in MnO₄⁻, its oxidation number was decreased from +7 on the reactant side to +2 on the product side. This shows a gain of additional five electrons.
Thus, MnO₄⁻ is reduced.
Also in C₂O₄²⁻, the oxidation number of carbon increases from +3 on the reactant side to +4 on the product side. Since an electron is lost, then oxidation occurs at C₂O₄²⁻
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The density of a material is a/an
What is the stable end product of the decay of uranium 238
Lead
Explanation:
by emission of alpha particles
The end product of the decay of uranium 238 is Pb-206.
Heavy elements are generally grouped into four decay series which are; Thorium series, Uranium series and actinium series and Neptunium series.
These heavy elements decay via a series of α and β emissions until a stable nucleus is finally achieved. All these decay series usually terminate in a lead nucleus.
Uranium 238 belongs to the uranium decay series and terminates at Pb-206.
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How much force is required to accelerate a 12 kg mass at 5 m/s2?
Answer:
The answer is 60 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 12 × 5
We have the final answer as
60 NHope this helps you
Which is the state of matter shown in this figure ?
Answer:
It looks like a solid because they are densely packed kind of like an ice cube
Explanation:
The state of matter shown in this figure is solid state, because the particles are arranged densely in the form of cube.
What is solid state ?The state of matter known as a solid has a definite form, mass, and volume. Changing the temperature causes extremely little variations in volume to be seen. For instance, sand, wood, copper, ice, etc., cannot be crushed.
One of the three fundamental states of matter, along with liquid and gas. Since atoms' energy drops when they adopt a comparatively organized, three-dimensional structure, solids can emerge from liquids or gases.
Because solids have specific mass, volume, and form, their component particles are arranged compactly. Between molecules, there is little intermolecular space. As a result, there is a strong force between the constituent particles (atoms, molecules, or ions).
Thus, option A is correct.
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What is the proof of the chemical reaction?
Answer: The chemical is disrupted, also most likely causing an explosion.
Explanation:
ito ang kontinenteng nagtataglay ng pinakamaraming bansa sa lahat ng kontinente
Answer:
Africa
Explanation:
Ang Africa ay ang kontinente na mayroong pinakamataas na bilang ng mga bansa sa lahat ng mga kontinente.
Kasalukuyan, ang bilang ng mga bansa sa kontinente ay 54, ito ay 53 bago ang South Sudan ang pinakabagong sumali.
Ang bilang na ito ay pinaniniwalaang tataas sa mga darating na taon dahil sa kaguluhan ng iba't ibang mga segment sa ilang mga bansa para sa kalayaan
determine the density of a liquid if 75 mL of the liquid have a mass of 63 g
Answer:
The answer is 0.84 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
mass = 63 g
volume = 75 mL
We have
[tex]density = \frac{63}{75} = \frac{21}{25} \\ [/tex]
We have the final answer as
0.84 g/mLHope this helps you
HELP PLZ
Bonding Models How can electron dot formulas be used to illustrate the anions or cations of elements?
Answer:
the anwcer on edg 2020 is yes
HOPE THIS HELPS
Explanation:
Why can't sugar be found on the periodic table?
crystal structure of argon
Answer:
Solid argon is stable in the face-centered cubic structure at all temperatures, but it is found that it can also crystallize in a metastable form with hexagonal close-packed structure. ... Small amounts of nitrogen, oxygen, or CO stabilize the hcp phase at temperatures near the melting point.
Explanation:
Physical Science A 20-21 - Spencer / Basics of Physical Scier
1. Decide which of the following is the best observation.
The dog ate the bone hiding.
The dog ate the bone hiding under the tree.
The dog ate the bone hiding under the shady tree.
The dog ate the bone.
Answer:
The dog ate the bone hiding under the shady tree.
Explanation:
The best observation is that the dog ate the bone hiding under the shady tree. This is because it provides the most graphic details about the position and activities of the dog.
With this choice, we can properly picture the dog and the relationship it has with the tree. The more information we know about a subject of investigation, the better an observation it affords. Such a well informed observation will make analysis much better.Answer:
The dog ate the bone hiding under the shady tree.
Explanation:
It has the most detail :)
Use the information given to calculate the average atomic mass of element Z. Z- 56 is 70% abundant and Z-59 is 30% abundant.
Answer:
56.9 amu
Explanation:
Depending on the number of isotopes an element has, the Average atomic mass of isotopes of an element can be calculated using:
(atomic mass of isotope1 × decimal abundance of isotope1) + (atomic mass of isotope2 × decimal abundance of isotope2)
According to this question, two isotopes of element Z were given
- Isotope Z- 56 with atomic mass 56 is 70% abundance. This means that its decimal abundance is 0.70
- Isotope Z- 59 with atomic mass 59 is 30% abundance. This means that its decimal abundance is 0.30
Therefore, average atomic mass of element Z is:
= (56 × 0.70) + (59 × 0.30)
= (39.2) + (17.7)
= 56.9
CAN SOMEONE PLEASE HELP ME WITH THIS QUESTION
Wrong or inproper answer will be reported
The mass of unreacted zinc = 13 g
Further explanationThe reaction equation is the chemical formula of reactants and products
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reactants and products
Reaction
[tex]\tt Zn+2HCl\Rightarrow ZnCl_2+H_2[/tex]
mol ratio Zn : HCl = 1 : 2
mol of HCl[tex]\tt mol=V\times M\\\\mol=0.1~L(100~cm^3)\times 2~mol/L\\\\mol=0.2[/tex]
mol of Zn[tex]\tt \dfrac{1}{2}\times 0.2=0.1~mol[/tex]
the mass of reacted Zn :[tex]\tt 0.1\times 65=6.5~g[/tex]
the mass of unreacted Zn[tex]\tt 19.5-6.5=\boxed{\bold{13~g}}[/tex]
Define Each Piece of the Microscope
Describe What Each Microscope Lens Does
Describe How The Microscope Magnification Lens Works
1) Body tube (Head): The body tube connects the eyepiece to the objective lenses. Arm: The arm connects the body tube to the base of the microscope. Coarse adjustment: Brings the specimen into general focus. Fine adjustment: Fine tunes the focus and increases the detail of the specimen.
2)Microscopes are made up of lenses for magnification, each with their own magnification powers. Depending on the type of lens, it will magnify the specimen according to its focal strength.
3)In simple magnification, light from an object passes through a biconvex lens and is bent (refracted) towards your eye. ... The eyepiece lens usually magnifies 10x, and a typical objective lens magnifies 40x. (Microscopes usually come with a set of objective lenses that can be interchanged to vary the magnification.)
what makes alkali metals a family?
Answer:
The metals in this group are lithium, sodium, potassium, rubidium, cesium, and francium. The gas hydrogen is also put in this group because it shares similar reactivity with the alkali metals.
I don't know if this is what you wanted or not sorry if it isn't
What is a hypothesis? A. a statement that can be tested through a scientific investigation В. a statement that summarizes the results of an experiment C. a question that cannot be scientifically tested D. a description of the steps involved in an experiment
Answer:
A
Explanation:
Hope this helps :)
9. First identify the following as either homogeneous substances or
heterogeneous mixtures. Then further classify as either elements,
compounds or mixtures:
a. Earth
i. Air
b. H(9) I
j. CuSO4(s)
C. Cuso, (aq)
k. NaCl (1)
d. Magnesium solid
1. Methane gas
e. Na (s)
m. Antimony (1)
f. Sugar (1)
n. H20 (1)
g. C.H2O. (aq)
o. 02 (9)
h. NaCl (aq)
p. CO (9)
Answer:
a few days ago of course I was a in the my life pro chef chef cooking channels and then the first first place to for the you know what do not you can be you know how much
Explain how your answer to CTQ 6 is consistent with your answer to CTQ 5.
Answer:
up 1
Explanation:
i'll mark brainliest if you can answer this quick and correctly only correct cause i don't accept bad answers or i'll report you if i get a bad grade
'
Explain why you cannot use a pump like the one at the right to
lift water up to the 3rd floor of an apartment building.
Answer:
can you aks it more clerlry
Explanation:
What are the solvent and solute in a solution containing 100 grams of ethanol and 3 grams of sucrose?
Answer: I think the ethanol in the solute and the sucrose is the solvent. Hope this helps!
Explanation: i learned this last year I think it is right?
A solvent is a chemical that dissolves a solute to produce a uniform solution. A solute is a substance that dissolves in a solvent, resulting in a homogeneous mixture. The solute is sucrose, and the solvent is ethanol.
What is meant by solution ?A solution is a well-mixed solution in a solvent of one or more dissolved solutes. A solute is a substance that dissolves another substance, creating a continuous medium. A solute is a substance that dissolves in a solvent, resulting in a homogeneous mixture.A solution is formed when one substance dissolves or degrades into another. A solute is any substance that dissolves to form a solution. A solvent is a chemical that is used to disperse a solute. The solute in a sugar-water solution is sugar, and the solvent is water. A solution is a homogeneous mixture of two or more particles with diameters less than one Nano meter.To learn more about Solution, refer to:
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Which has the least potential energy?
gases
liquids
solids
Answer
The answer is SOLIDS
Explanation:
does anyone know how to do this??????
Answer:
you have to answer about what Emmy Noether was known for and how she accomplished her goal! For example Dr. Martin Luther King was known for his peaceful protests and his famous "I Have a Dream". He accomplished this goal by never giving up and sticking to his morals! I hope this helped!! ♡♡ (BTW love your profile picture)
please help timed !! due rn !! What happens to particle motion as two substances come to thermal equilibrium?
Answer:
When two substances that are of different temperatures are brought together and there is heat transfer such that the substances come to thermal equilibrium, the effect on the particle motion are as follows
1) The particle motion of the hotter body reduces, because its temperature reduces
2) The particle motion of the colder body increases, because its temperature increases
3) For gases, the volume and or pressure reduces for the hotter body, and if the temperature of the gas falls below the boiling point temperature, the gas will change into liquid
For the colder gas, only the volume and or pressure increases and the temperature rises
4) For liquids, if the temperature of the hotter liquid falls below the melting point, the hotter liquid will become a frozen solid
For the the colder liquid, if the temperature is raised above the boiling point, the liquid changes into gas and the temperature does not rise above the boiling point temperature, until all the cold liquid has evaporated
5) For solids, the vibration of the particles of the hotter substance reduces and the solid becomes more brittle
For the colder body, the rise in temperature causes an increase in vibration of the particles, and if the temperature rises above the melting point, the colder solid will begin to melt
Explanation:
I WILL GIVE YOU BRAINLIEST!!!
which sentence uses emitting correctly
A after emitting his mistake, Charlie vowed to make things better.
B Charlie should be emitting an apology.
C Charlie heard birds emitting a very strange sound.
D the emitting sound of an early moring birds woke charlie.
Answer:
its either A or C
Explanation:
Q) which sentence uses emitting correctly ?
Answer :(c) Charlie heard birds emitting a very strange sound .Explanation :
Emitting means ' to give off ' , since birds are giving off a strange sound , we say " Charlie heard birds emitting a very strange sound " .