Answer:
Scientific Notation: 3.45 x 10^5
E Notation: 3.45e5
Explanation:
The picture below is of oxygens bonded together. This forms a...
a) molecule
b) element
c) molecular compound
d) atom
Answer:
Explanation:
The picture shows two similar structures bonded together so it can not be an atom or molecular compound .
It is a molecule . Each structure ( lobe ) represents atom of oxygen . Molecule of oxygen contains two atoms bonded together .
Molecule of oxygen = O₂ .
Why is most of the Earth’s fresh water unavailable?
Answer:
2.5% of the earth's fresh water is unavailable: locked up in glaciers, polar ice caps, atmosphere, and soil; highly polluted; or lies too far under the earth's surface to be extracted at an affordable cost.
Explanation:
115 mL of a 2.35 M potassium
fluoride (KF) solution is diluted with 1.28 L of water. What is the new concentration in molarity?
? M KF
The new concentration : = 0.194 M
Further explanationGiven
115 mL(0.115 L) of a 2.35 M Potassium fluoride (KF)
1.28 L of water
Required
The new concentration
Solution
Dilution is the process of adding solvent to get a more dilute solution.
The moles(n) before and after dilution are the same.
Can be formulated :
M₁V₁=M₂V₂
M₁ = Molarity of the solution before dilution
V₁ = volume of the solution before dilution
M₂ = Molarity of the solution after dilution
V₂ = volume of the solution after dilution
V₂=0.115 + 1.28 = 1.395 L
Input the value :
M₂ = (M₁V₁)/V₂
M₂ = (2.35 x 0.115)/1.395
M₂ = 0.194
Answer: 0.194
Explanation:
pls help. the picture is above. thanks!!
What is the molar mass of Ba3(PO4)2?
Answer:
601.93 g/molexplanation:Problem: The Ba3(PO4)2 (molar mass = 601.93 g/mol) precipitate that formed from a salt mixture has a mass of 0.667 g.
The molar mass of barium phosphate is 601.93 g/mol.
What is molar mass?Molar mass is defined as the mass of a compound divided by the number of moles which is the amount of substance .It is a bulk quantity and not a molecular property of a substance . They are mostly calculated by adding the atomic masses of constituent elements in a compound.
It is an average of many particles or molecules.Molar mass is an intensive property as it does not depend on size of the sample.It has units of kg/mol. Molar masses of elements is given by relative atomic mass of element whereas that of compounds is given by the sum of relative atomic mass multiplied by the molar mass constant.
They are never measured directly , they are measured from the standard atomic masses.
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Which one show more vapour pressure?
A. alcohol B. gasoline C. water D. both a & b
6. A father rabbit had long ears while the mother rabbit had short ears. Which of these statements
explains why one of the baby bunnies could have long ears?
a
The baby bunny inherited its copies of the gene for ear length from its father and not from
its mother. Those genes connect together to make its ears long.
b
The baby bunny inherited its copies of the gene for ear length from its father and not from
its mother. Just like its father's genes, those genes instruct for proteins that connect in
ways that make its ears long.
С
The baby bunny inherited one copy of the gene for ear length from its father and one copy
from its mother. That gene combination instructs for proteins that connect in ways that
make long ears.
d
The baby bunny inherited one copy of the gene for ear length from its father and one copy
from its mother. Those genes connect together to make its long ears.
Answer:
D if I’m correct
Explanation:
PLS HELP omg im gonna fail :')
why is it important that the level of the sea water does not go above the level of the filter paper
Answer:
The water (the substance) that passes through the filter paper is called the filtrate. If your mixture is a solution, such as salty water, then filtering will not separate the salt from the water. Instead, by heating the soluton the solvent (water) evaporates leaving the solid (salt) behind.
Explanation:
PLEASE HELP 5TH GRADE SCIENCE Select the statement that correctly compares the sun and a comet.
O A. The sun and a comet orbit around the planets in space.
O B. The sun and a comet are bright and made up entirely of gas.
O C. The sun is at the center of the solar system, and the comet orbits around it.
O D. The sun is very small in size compared to a comet.
Answer:
c
Explanation:
The sun is at the center of the solar system, and the comet orbits around it.
The sun is at the center of the solar system, and the comet orbits around it. Therefore, option C is correct. Comets are orbiting around sun through the elliptical orbit.
What are comets ?Comets are tiny spatial objects that are composed of ice, dust and gases. Comets go around the sun in a highly elliptical orbit. They can spend hundreds and thousands of years out in the depths of the solar system before they return to sun at their perihelion.
Like all orbiting bodies, comets follow Kepler's Laws - the closer they are to the Sun, the faster they move. While a comet is at a great distance from the Sun, its exists as a dirty snowball several kilometers across.
But as it comes closer to the sun, the warming of its surface causes its materials to melt and vaporize producing the comet's characteristic tail. Comet tails can be as long as the distance between the Earth and the Sun. Hence, option C is correct.
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HURRY!!!!!!Find the moles of sulfur produced, if 2.5 moles of sulfur dioxide are used in the following chemical reaction: SO2 + 2H2S → 2H2O + 3S
A. none of the above
B. 2.50 mol
C. 1.25 mol
D. 7.5 mol
E. 0.833 -- It is not this one
Answer:
7.5 MOL
Explanation:
C₃ H8
What is the subscript for carbon in this molecule?
Answer:
3
Explanation:
Subscript basically tells you the number of element or ions present in a compound. In this case the subscript of carbon which is 3 denotes that only three carbon atoms is present in the compound.
define "seperation of centrifugation"
plz answer
have a great day
Answer:
ur answer, hope it helps you...
Answer:
Centrifugation is a technique used for the separation of particles from a solution according to their size, shape, density, viscosity of the medium and rotor speed. The particles are suspended in a liquid medium and placed in a centrifuge tube. The tube is then placed in a rotor and spin at a define speed.
What does the line of red semicircles mean on a weather map?
a warm front
a cold front
a stationary front
an occluded front
Answer:
A warm front
Explanation:
Answer: A warm front
Explanation:
D. If you were talking to an elderly person who was having trouble hearing you, would it
be better to talk in a deeper voice (low-frequency sound) or a higher voice (high-
frequency sound)?
Answer:
Deeper Voice (low-frequency sound)
Explanation:
For me, I would talk to an elderly person who has trouble hearing me in a deeper voice because at least it's not too loud. If you talk to a person with a higher voice (high-frequency) it can just affect their hearing more.... when you scream, that a high-frequency and sometimes it bothers your ears, so for me in general I would use a deeper voice.
Hope this helped!
Have a supercalifragilisticexpialidocious day!
pls help
How many atoms do you have for each element in C₃H₈O?
Answer:
c-3 h-8 o-1 total-12
Explanation:
you just count the atoms
Help me with this pls
Sodium chloride reacts with phosphoric acid to form sodium phosphate and hydrochloric acid.
Answer in a balanced chemical equation.
Answer:
3NaCl + H₃PO₄ → Na₃PO₄ + 3HCl
Explanation:
The reactants in this reaction are:
Sodium chloride - NaCl
Phosphoric acid - H₃PO₄
Products of the reaction:
Sodium phosphate - Na₃PO₄
Hydrochloric acid - HCl
Therefore;
NaCl + H₃PO₄ → Na₃PO₄ + HCl
To balance this reaction expression, assign variables a,b, c and d to it;
aNaCl + bH₃PO₄ → cNa₃PO₄ + dHCl
Conserving Na; a = 3c
Cl; a = d
H; 3b = d
P; b = c
O; 4b = 4c
let c = 1, b = 1, a = 3 and d = 3
So;
3NaCl + H₃PO₄ → Na₃PO₄ + 3HCl
Which physical property is demonstrated when you dissolve koolaide in
water?
Answer:
The dissolving of the Kool-Aid powder into water is a physical change. The powder, the solute, is dissolved in water, the solute, forming a Kool-Aid solution.
Can someone plz help? Thanks so much!
An atom that contains 6 protons 6 neutrons and 6 electrons has a mass of approximately
1) 12 u
2) 12 g
3) 18 u
4) 18 g
Answer:
12 grams
Explanation:
Electrons do not contribute to mass. The proper unit to use is G
During the naval battles of the South Pacific in World War II, the U.S. Navy produced smoke screens by spraying titanium tetrachloride into the moist air where it reacted according to the equation:
TiCl4 + H2O TiO2 + HCl
a. How many moles of H2O are needed to react with 6.50 moles of TiCl4? (13.0)
b. How many moles of HCl are formed when 8.44 moles of TiCl4 react? (33.8)
Explanation:
The reaction given is;
TiCl4 + H2O --> TiO2 + HCl
The reaction is not balanced, upon balancing it is given as;
TiCl4 + 2H2O → TiO2 + 4HCl
a. How many moles of H2O are needed to react with 6.50 moles of TiCl4?
From the reaction;
1 mol of TiCl4 requires 2 mol of H2O
6.50 mol of TiCl4 would require x mol of H2O
1 = 2
6.5 = x
x = 6.5 * 2 / 1 = 13.0 mol
b. How many moles of HCl are formed when 8.44 moles of TiCl4 react?
From the equation of the reaction;
1 mol of TiCl4 reacts to form 4 mol of HCl
8.44 mol of TiCl4 reacts to form x mol of HCl
1 = 4
8.44 = x
x = 8.44 * 4 / 1 = 33.76 mol
what mass of ZnCI2 can be prepared from the reaction of 3.27 grams of zinc with 3.30 grams of HCI?
Zn + 2HCI —-> ZnCI2 + H2
Answer:
Zn. + 2 HCl ----------> ZnCl2. + H2
Explanation:
Mass of Zn in mole = 3.27/ 65.38= 0.050010.... mol
Mass of HCl in mole = 3.3/ 73= 0.044....mol
Hence, limiting reagent is HCl
Molar mass of ZnCl2= 136.38g
Let mass of ZnCl2 be x
x = 3.3*136.38÷ 73 = 6.165...
So, the mass of ZnCl2 is 6.17 g
A metal can form
A.
a stable nucleus
B.
an anion
C.
a new family
D.
a cation
what are two examples of x-ray waves?
Need help ASAP plzzzzzz
Answer:
Biodiesel has a higher oxygen content (usually 10 to 12 percent) than petroleum diesel. ... Biodiesel is more chemically active as a solvent than petroleum diesel. As a result, it can be more aggressive to some materials that are normally considered safe for diesel fuel. Biodiesel is much less toxic than petroleum diesel.
Why do we sometimes use roman numerals in naming ionic compounds?
We use roman numerals to indicate the oxidation state of metal atoms when naming compounds especially in the case of coordination compounds. It is a standard system of nomenclature.
What is oxidation state?Oxidation state of a species is the number electrons gained or lost. Oxidation state increases if electrons are lost from the atom and it will be decreased if electrons are gained.
For example, copper is in + 2 oxidation state in CuSO₄, thus it can be indicated as Cu(II). Copper can exists is +3 oxidation too. Thus the representation will be Cu (III).
All the transition metals like copper exhibit various oxidation state. So it is important to indicate in which oxidation state they are in a particular compound. In the compound Fe₂O₃, iron is in + oxidation state whereas in FeSO₄, it can be +2 . Thus it is important to note whether it is Fe (II) or Fe (III).
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What is the percent of N in
Li3N?
(Li = 6.94 amu, N = 14.01 amu)
Answer:
The percent of n would be 7.10
Explanation:
Which phase do the chromosomes line up in the middle
Answer:
metaphase
Explanation:
the cells chromosomes line themselves in the middle of the cell through a type of cellular tug of war.
Answer:
metaphase
Explanation:
During metaphase, the cell's chromosomes align themselves in the middle of the cell through a type of cellular "tug of war." The chromosomes, which have been replicated and remain joined at a central point called the centromere, are called sister chromatids.
A solution of baking soda has a pH of 9. Baking soda
(blank)
Answer: is a base
Explanation:
Predictions about the future based on the position of planets is an example of physics biology earth science pseudoscience
Answer:
Pseudoscience
Explanation:
Predicting the future based solely on the position of the planets is an example of pseudoscience.
Pseudoscience is a body of knowledge that is not based on the scientific method but on some unverifiable/unprovable claims.
Predictions about the future can only be valid if it is based on the scientific method, not just about the position of the planet. The scientific method involves observation, hypothesis formulation, testing of the hypothesis through repeatable experiments, and arriving at conclusion.
Any other statement or belief that is not based on these procedures is said to be pseudoscientific.
Answer:
The answer to your question is pseudoscience.
Explanation:
I took the module 1 exam and got it right, yesterday.