The electromagnetic spectrum includes, from longest wavelength to shortest: radio waves, microwaves, infrared, optical, ultraviolet, X-rays, and gamma-rays.
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The equation for the pH of a substance is pH = –log[H ], where H is the concentration of hydrogen ions. A basic solution has a pH of 11. 2. An acidic solution has a pH of 2. 4. What is the approximate difference in the concentration of hydrogen ions between the two solutions?.
The approximate difference in the concentration of hydrogen ions between the two solutions is 8.7.
What is pH?
pH is the measure of how acidic and basic a liquid is. The full form of pH is potential hydrogen.
By the formula of pH
pH = -log [H +]
[tex][H^+] = 2 \times 10 ^ -^9[/tex]
[tex]pH = -log (2 \times10 ^ -^9)[/tex]
pH = 8.7
Thus, the pH difference is 8.7.
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In the measurement 0.342, which number is the estimated digit?
Answer:
"The last digit in any number is referred to as the estimated digit."
Explanation:
So it should be 2
Which two organisms are classified as secondary consumers?
Answer:
Carnivorous, or meat eaters for example wolves, crocodiles, eagles, piranhas and dragon fly larva
Omnivorous
Conservation efforts have been effective in _______. A. Increasing the number of endangered species b. Reducing all the negative impacts of human activity c. Preserving wildlife habitats d. All of the above.
Answer:
C. preserving wildlife habitats
Conservation efforts have been effective in preserving wildlife habitats.
What is conservation?They are efforts invested toward conserving or sustainable usage of natural resources.
Biodiversity conservation involves conserving plants and animal resources to prevent their abusive or wanton usage and depletion.
Through efforts at conserving biodiversity, wildlife habitats have to be preserved. By preserving habitats, biodiversity is conserved. Through habitat destruction, biodiversity is destroyed.
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Can someone help me??? Please
PLEASE GELP ME I WILL MARK BRAINLIEST
4Li + O₂ ⇒ 2Li₂O
Li₂O = 2/4 x 3.33 = 1.665
nitrogen is an atom or molecules
Answer:
Nitrogen will called as atom or molecule or ion too in the state which it exist means in which form it is present .
The solar system is the collective name for the sun, eight planets, and their moons. The
blank is the center of the solar system, and everything orbits around it.
Answer:
The sun
Explanation:
The sun is the center of the solar system and all the planets orbit around it (moons orbit around respective planets which orbit around the sun)
Answer:
The Sun.
Explanation:
☀️
The Sun is like the “power house” of the solar system, we rely on it, and everything orbits around it.
When 84. 8 g of iron (III) oxide reacts with an excess of carbon
monoxide, iron is produced.
Fe2O3(s) + 3C0 (9) > 2 Fe(s) + 3 CO2 (g)
What is the theoretical yield of iron?
Answer:
Use the balanced equation to determine the theoretical yield. Focus on the chemicals whose quantities you are given or are asked to find. CO is not important as it is excess and will make sure that all of the Fe2O3 will be changed to iron. Remember the quotients (numbers in front of formula) are the number of moles. You are given the mass of Fe2O3 in grams so you will need to convert 1 mole of Fe2O3 into grams (molar mass which, using simple atomic masses = 56x2 + 16x3 = 160g/mol but you use atomic masses that your course requires
Fe2O3(s) + 3CO(g)--> 2Fe(s) + 3CO2(g)
1 mol 2 mol
160g 112g
84.8g (112/160) x 84.8
So now you have the theoretical yield of Fe2O3 and the experimental (actual) yield = 54.3g)
Percentage Yield = (actual yield/theoretical yield) x 100
(◠‿◕)
Which of the compounds below will ionize in
water? Check all that apply.
H2SO,
NH3
NaCl
SO2
MgBr2
The compounds which will ionize in water include the following:
H2SO4NH3SO2What is Ionization?This is defined as the separation of a chemical's molecules into positive and negative ions.
The compounds which undergo ionization in water are seen above and is the most appropriate choice.
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How many mL of 2.5 M K2SO4 are required to obtain 1.25 grams of the compound?
2.87mL of 2.5 M K2SO4 are required to obtain 1.25 grams of the compound.
HOW TO CALCULATE VOLUME?The volume of a substance can be calculated by dividing the number of moles of the substance by its molarity. That is;
volume = no. of moles ÷ molarity
According to this question, 2.5M K2SO4 are required to obtain 1.25 grams of the compound. The volume can be calculated as follows:
Molar mass of K2SO4 = 174.26 g/mol
moles of K2SO4 = 1.25g ÷ 174.26g/mol
moles of K2SO4 = 0.00717moles
Volume = 0.00717moles ÷ 2.5
Volume = 0.00287 L = 2.87mL.
Therefore, 2.87mL of 2.5 M K2SO4 are required to obtain 1.25 grams of the compound.
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For the reaction A(g)
* 2B(g) the
following concentrations where measured
at 25°C. The Kc for this temperature is 1
Is the reaction at equilibrium?
[A] = 4 M
[B] =2 M
Answer:
Yes
Explanation:
By definition, the equilibrium constanct, Kc, for the reaction A ⇒ 2B is
= [A]^1 / [B]^2
Substitute [A] = 4 and [B] = 2 in the equation,
[A]^1 / [B]^2
= 4^1 / 2^2
= 1
= Kc
So yes the reaction is at equilibrium.
Let's find K_c
[tex]\\ \rm\Rrightarrow K_c=\dfrac{[B^]^2}{[A]^1}[/tex]
[tex]\\ \rm\Rrightarrow 1=\dfrac{2^2}{4}[/tex]
[tex]\\ \rm\Rrightarrow 1=\dfrac{4}{4}[/tex]
[tex]\\ \rm\Rrightarrow 1=1[/tex]
Yes it's at equilibrium
Alana drew diagrams to show how particles in a spoon move before and after the spoon is placed in hot liquid. At left a grid labeled Before of regularly arranged orange balls with large movement lines near each. At right a grid labeled After of regularly arranged orange balls with small movement lines near each. Which best explains how to correct Alana’s error? Make the particles in both diagrams larger. Show more movement in the ""Before"" diagram. Add more particles to the ""After"" diagram. Switch the labels on the diagrams.
The heating of the substance resulted in the transfer of energy and thereby increase the randomness. Thus, Alana's error can be rectified by switching the labels on the diagram.
What is the arrangement of atoms?The atoms are the smallest particles, and everything is made of atoms. The atoms in the object are arranged in a specific lattice to give shape to the object.
The heating resulted in the transfer of energy to the atoms, and the atoms started to move thereby will not be linearly arranged after heating.
Thus, the heating and the atomic arrangement effect can be explained by switching the labels on Alana's diagram. thus, option D is correct.
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Answer:
D
Explanation:
Switch the labels on the diagrams
A solution is prepared by dissolving a
certain amount of solute in 500 g of
water. The percentage by mass of a
solute in a solution is 2.38. Calculate the
mass of solute
Answer:
119g
Explanation:
Just multiply
2.38% of 500 =
119 g
solution = solute + solvent
% mass of solute:
[tex]\tt \dfrac{mass~solute}{mass~solution}\times 100\%[/tex]
for % mass of solute = 2.38%, then mass of solute:
[tex]\tt =2.38\%\times 500~g=\boxed{\bold{11.9~g}}[/tex]
Which subatomic particle is correctly paired with its properties?
A) Proton: positively charged, mass about equal to that of an electron
B) Neutron: no electric charge, mass about equal to that of a proton
C) Electron: negatively charged, mass about equal to a neutron
D) Positron: negatively charged, mass about equal to that of a proton.
Answer:
A. proton is positive charged ans and is equal to electrons
Proton positively charged, mass about equal to that of an electron subatomic particle is correctly paired with its properties.
The correct option is A.
What are subatomic particle made of?They include the heavier constituents of the small but extremely dense atom's nucleus, the positively charged protons and the electrically neutral neutrons, as well as the electrons, the negatively charged, nearly massless particles that still make up the majority of the atom's size.
Where is subatomic particle ?Two subatomic particles are bound together by the strong nuclear force to form the atomic nucleus. The proton is one of these subatomic elements. The neutron is the other. Similar in size and mass to protons, neutrons are electrically neutral or devoid of any net electrical charge.
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How many grams of KNO3 should be used to prepare 2.00 L of a 0.500 M solution?
Answer:
101 g KNO₃
Explanation:
Molarity is measued in moles per liter, mol L− 1, or molar, M, which means that a 0.500-M solution will contain 0.500 moles of potassium nitrate for every 1 L of solution.
Well, if you get 0.500 moles for every liter of solution, and your solution has a total volume of 2.0 L, it follows that it must contain 2 × 0.500 moles = 1.00 moles KNO₃
So, what mass of potassium nitrate is equivalent to one mole of the compound?
Potassium nitrate's molar mass, 101.103 g mol− 1, tells you the mass of one mole of potassium nitrate. In this case, the answer must be rounded to three sig figs, so m KNO₃ = 101 g KNO₃
Hope this helped!
101 grams of KNO₃ should be used to prepare 2.00 L of a 0.500 M solution.
What is Mole?
The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.
A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.
Given,
Volume of KNO₃ = 2 L
Concentration = 0.5 M
Moles of KNO₃ = Concentration × volume
= 0.5 × 2
= 1 mole
Mass of KNO₃ = Moles × molar mass
= 1 × 101
= 101g
Therefore, 101 grams of KNO₃ should be used to prepare 2.00 L of a 0.500 M solution.
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Mechanical waves travel best through a
medium while electromagnetic waves
travel best through a
A. vacuum
B. solid
C. liquid
D. gas
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vaccum
Explanation:
vaccum is your answer
I hope you help
How many moles are in 3.75 x 10^25 atoms of Tungsten?
Answer:
62.29 moles
Explanation:
See attached image
how many parts does the eukaryotic cell have in total
if u answer correctly u will get 20 points
Answer:
3 parts
Explanation:
Eukaryotic cells have 1) a membrane-bound nucleus; 2) numerous membrane-bound organelles and 3) several, rod-shaped chromosomes.
Observations and Conclusions
What charts, tables, or drawings would clearly show what you have learned in this lab?
Each chart, table, or drawing should have the following items:
a. An appropriate title
b. Appropriate labels
Answer:
The answer is going to be a.)An appropriate title
Explanation:
This is because the charts,tables,or drawing's that you're learning are always going to be an appropriate title
1.33 dm3 of water at 70°C are saturated by 2.25
moles of lead(II) trioxonitrate(V), Pb(NO3)2, and
1.33 dm3 of water at 18°C are saturated by 0.53
mole of the same salt\If 4.50 dm3 of the saturated
solution are cooled from 70°C to 18°C, calculate
the amount of solute that will be deposited in
(a) moles,
(Pb = 207, N = 14,0 = 16)
(b) grams.
Given that 4.50 dm³ of Pb(NO₃)₂ is cooled from 70 °C to 18 °C, the
amount amount of solute that will be deposited is 1,927.413 grams.
How can the amount of solute deposited be found?
The volume of water 1.33 dm³ of water 70 °C.
The number of moles of Pb(NO₃)₂ that saturates 1.33 dm³ of water at 70 °C = 2.25 moles
At 18 °C, the number of moles of Pb(NO₃)₂ that saturates 1.33 dm³ of water = 0.53 moles
Therefore;
Number of moles of Pb(NO₃)₂ in 4.50 dm³ at 70 °C is therefore;
1.33 dm³ contains 2.25 moles.
[tex]Number \ of \ moles \ in \ 4.50 \ dm^3 = \dfrac{2.25}{1.33} \times 4.50 \approx \mathbf{7.613 \, moles}[/tex]
Number of moles of Pb(NO₃)₂ in 4.50 dm³ at 70 °C ≈ 7.613 moles
Number of moles of Pb(NO₃)₂ in 4.50 dm³ at 18 °C is therefore;
1.33 dm³ contains 0.53 moles
[tex]Number \ of \ moles \ in \ 4.50 \ dm^3 = \dfrac{0.53}{1.33} \times 4.50 \approx \mathbf{1.79 \, moles}[/tex]
Number of moles of Pb(NO₃)₂ in 4.50 dm³ at 18 °C ≈ 1.79 moles
The number of moles that precipitate out = The amount of solute deposited
Which gives;
Amount of solute deposited = 7.613 moles - 1.79 moles = 5.823 moles
The molar mass of Pb(NO₃)₂ = 207 g + 2 × (14 g + 3 × 16 g) = 331 g
The molar mass of Pb(NO₃)₂ = 331 g/mol
The amount of solute deposited = Number of moles × Molar mass
Which gives;
The amount of solute deposited = 5.823 moles × 331 g/mol = 1,927.413 g
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if an atom has the same equal amount of electron and proton is it charged or uncharged
HELP ASAP!! BRAINLIEST!! If you added a 15.00 piece of solid Cu to an aqueous solution of silver nitrate, the silver would be replaced in a single replacement reaction forming aqueous copper(II) nitrate and solid silver. How much silver is produced if 15.00 g of Cu is added to the solution of excess silver nitrate?
1. Determine the moles of Ag produced:
2. Convert moles Ag to grams of Ag produced:
A transverse wave that has electrical and
magnetic properties is known as
A. magnetism
B. loudness
C. electricity
D. electromagnetic energy
How many moles of potassium sulfide are there in 61. 0g.
Answer:
0.62 moles
Moles of potassium sulfide is 0.62 moles
Explanation:
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50 POINTS PLEASE HELO ME
Answer:
128g
Explanation:
Simply multiply the number of moles by the molar mass of each substance (64 g/mol for SO2 and 32 g/mol for 02):
SO₂ → 2 moles × 64 g/mol =128g
O₂ → 1 mole x 32 g/mol =32g
A refrigeration lubricant with a high _____ point may have excessive wax separation, which can clog the system.
Answer:
ozone
Explanation:
A refrigeration lubricant with a high floc point may have excessive wax separation, which can clog the system.
What is floc point?The Floc point of the oil can be described as the temperature at which wax will start to precipitate from a mixture. When a mixture of 90% by volume of R-12 and 10% oil by Volume under the specified conditions.
Since the oil-soluble refrigerants lower the viscosity of the oil and affect both the pour point and cloud point. The floc point of the oil is a more important property where oil miscible refrigerants are used.
The results are used to compare the waxing tendency of the various different oils. It provides a method for determining the waxing tendency of the refrigeration lubricant. Floc point should not be confused with cloud point because cloud point is the temperature at which the wax is precipitated from the undiluted oil.
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Binary covalent compounds can be named as a function of what?
A. increasing period number
B. decreasing group number
C. increasing group number
D. octet rule
Answer:
Binary molecular (covalent) compounds are formed as the result of a reaction between two nonmetals.
Binary covalent compounds which have slight difference in their electronegativities can be named as a function of the octet rule.
What are covalent compounds?
Covalent compounds have covalent bonds which is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.
Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.
Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.
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what is considered cisgender?
Answer:
that means whatever gender you are now is the same as what was presumed for you at birth.
Which property of matter is best measured using the tool shown?
A. Reactivity
B. Volume
C. Mass
D. Ductility
Answer: B volume
Explanation: that tool is used to measure volume or liquid
Answer:
B. Volume
Explanation:
test
