Answer:
[tex]Cr_{2} O_{4}[/tex]
Explanation:
[tex]\frac{molecular weight}{molar mass}[/tex] = [tex]\frac{168}{83.99}[/tex] = 2.00
[tex]CrO_{2}[/tex] x 2 = [tex]Cr_{2} O_{4}[/tex]
3. What does the double-ended arrow indicate in
the following chemical equation?
CaCO3 = Ca2+ + CO32-
Answer:
⇌ means that the equation is reversible, The reactants can become products and vice versa
Explanation:
Answer:
See below ~
Explanation:
The reaction :
CaCO₃ ⇄ Ca²⁺ + CO₃²⁻The double sided arrow represents that this is a reversible reaction.
Just as calcium carbonate can dissociate into calcium ion and carbonate ion, it can form calcium carbonate when calcium ion and carbonate ion are bonded together ionically.
7Mg(OH)2 how many elements are they?
Answer:
3
Explanation:
magnesium
oxygen
hydrogen
Please help me i dont understand this
Considering the Avogadro's Law, 1.52 moles are left in the container.
Avogadro's LawAvogadro's Law is a gas law that establishes the relationship between the amount of gas and its volume when temperature and pressure are held constant.
This law states that the volume is directly proportional to the amount of gas: if the amount of gas increases, the volume will increase; while if the amount of gas decreases, the volume decreases.
Mathematically the law can be expressed as:
[tex]\frac{V}{n}=k[/tex]
Assuming that you have a certain amount of gas n1 that occupies a volume V1 and the amount of gas varies until a new value n2, then the volume will change to V2, and the following will be true:
[tex]\frac{V1}{n1}=\frac{V2}{n2}[/tex]
Amount of moles left in this caseIn this case, you know:
V1= 65 Ln1= 2 molesV2= 49.4 Ln2= ?Replacing in the Avogadro's Law:
[tex]\frac{65 L}{2 moles}=\frac{49.4 L}{n2}[/tex]
Solving:
[tex]n2x\frac{65 L}{2 moles}=49.4 L[/tex]
[tex]n2=\frac{49.4 L}{\frac{65 L}{2 moles}}[/tex]
n2= 1.52 moles
Finally, 1.52 moles are left in the container.
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If the temperature of a 50ml sample of gas is changed from 200k to 400K under constant pressure what is a new volume of the gas?
Answer: 100 mL
Explanation:
( 20 points plus brainliest! )
Which best describes DDT as a pesticide? Select all that apply.
A) DDT is able to target destructive insects.
B) DDT decomposes very slowly.
C) DDT can be controlled so it does not spread to other areas.
D) DDT results in antibiotic formation in livestock.
E) DDT is readily absorbed by animal tissue.
F) DDT contaminated ground water and runoff into streams, rivers, and oceans.
Derek needs a tool that delivers 5.00 ml of a sodium hydroxide solution. which tool would be best for him to use? a beaker a pipette a graduated cylinder an erlenmeyer flask
Because 5.00 mL is a small amount, the best tool he could use is a pipette.
What is a pipette?Pipette or sometimes spelled as pipet can be used to transport liquid samples. It is made out of glass or plastic and can is usually used to transfer measured volumes of liquid from one container to another.
Before the pipette was invented, scientists used to use straws and they would suck in the samples carefully.
Hence 5.00 mL is a small amount, the best tool he could use is a pipette.
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An unknown substance is found to have a hydrogen concentration of 1.2 * 10 ^ - 2 , what is the pOH? Is it acidic or basic?
Answer:
12.1; acidic
Explanation:
I'm assuming the hydrogen concentration is H+.
So, first we must find pH.
pH = -log[H+]
I simply just plugged in the concentration.
I get 1.9 as the pH. This means that the substance is very acidic since it has a low pH.
Now to find poH.
poH + pH = 14
I simply plugged in once again!
I get 12.1 as the poH. This also determines that the substance is very acidic since it has a high poH.
Within a period, as atomic number increases, electrical conductivity of each element in the solid state generally
1) decreases
2) increases
3) remains the same
Answer:
decreases
Explanation:
Atomic size gradually decreases from left to right across a period of elements. This is because, within a period or family of elements, all electrons are added to the same shell.
Compounds where a metalloid with a relatively high oxidation number bears a hydroxyl group are usually:
Compounds where a metalloid with a relatively high oxidation number bears a hydroxyl group are usually amphoteric and impossible to predict.
What is a metalloid?A metalloid is an element whose properties lie at te boarder line between the properties of metals and nonmetals . This means that a metalloid can behave as an acid/base.
Hence, compounds where a metalloid with a relatively high oxidation number bears a hydroxyl group are usually amphoteric and impossible to predict.
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Which factor is NOT important when choosing a conversion factor? *
•Unit placement of the numerator and denominator (top and bottom)
•Changing the value
•The value must equal 1
•Equivalent things in the numerator and denominator (top and bottom)
The factor that is not important when choosing a conversion factor is that the value must equal 1.
What is a conversion factor?The conversion factor is used to convert values form one unit to another. This operation is common in science when calculations are made that involves units.
Now, the factor that is not important when choosing a conversion factor is that the value must equal 1.
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What property of a substance does the titration process identify?
Concentration
Density
pH value
Mass
Answer:
Explanation:
Concentration. Titration is a process in which a solution of unknown concentration is determined by using a solution of known concentration
Please help me quickly and provide work, will mark brainliest
Answer:
4.7 Liters of NO2
Explanation:
mole weight of HNO3 (from periodic table) = ~~ 63 gm/mole
12 grams of this is 12/63 = .19047 mole
From the equation, you should be able to see that 3 moles of NO2 produces 2 moles of HNO3
so you need 3/2 * moles HNO3 = .2857 moles of NO2 needed
PV = nR T n = moles R = .082057 L-atm/(k-mole) 25 C = 298.15 K
1.6 (V) = .2857 (.082057)(298.15)
solve for V = 4.37 liters of NO2
why neon is special from other chemical elements
The electrolysis of water forms h2 and o2. 2h2o right arrow. 2h2 o2 what is the percent yield of o2 if 10.2 g of o2 is produced from the decomposition of 17.0 g of h2o? use percent yield equals startfraction actual yield over theoretical yield endfraction times 100.. 15.1% 33.8% 60.1% 67.6%
The percent yield of oxygen if 10.2 g of O₂ is produced from the decomposition of 17.0 g of H₂O is 67.6%.
How do we calculate moles from mass?Moles (n) of any substance can be calculated by using their mass as:
n = W/M, where
W = given mass
M = molar mass
Given chemical reaction is:
2H₂O → 2H₂ + O₂
Moles of 17g H₂O = 17g / 18.02 g/mol = 0.943 moles
From the stoichiometry of the reaction it is clear that,
2 moles of H₂O = produces 1 mole of O₂
0.943 moles of H₂O = produces 1/2×0.943=0.471 mole of O₂
Now mass of this 0.471 moles of O₂ = (0.472mol)(32g/mol) = 15.104 grams
Actual mass of oxygen = 10.2g (given)
Now on putting vales on the percent yield formula, we get
% yield = (10.2 / 15.104)×100% = 67.53% = 67.6%
Hence the required value of percent yield is 67.6%.
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Answer:67.6
Explanation:bc im just that good
A solution is created by measuring 3. 60 x 10-3 moles of NaOH and 5. 95 x 10-4 moles of HCl into a container and then water is added until the final volume is 1. 00 L. What is the pH of this solution? Please answer as quickly as possible
Answer: 11.478
Explanation:
M = MBVB- MAVA/VA + VB
= number of moles of base - number of moles of acid/total volume
= 3.6*10^-3 - 5.95*10^-4/1
= 0.0036-0.000595 = 0.003005
[OH^-] = M = 0.003005M
POH = -log[OH^-]
= -log0.003005
= 2.522
PH = 14 - POH
= 14 - 2.522
= 11.478
Therefore, the pH of the solution is 11.478
What is the naming process of alkanes, alkenes, and alkynes
Answer: Heyo Kenji Here! Here's your answer- Higher alkenes and alkynes are named by counting the number of carbons in the longest continuous chain that includes the double or triple bond and appending an -ene (alkene) or -yne (alkyne) suffix to the stem name of the unbranched alkane having that number of carbons.
Explanation: Hope this helps!
Have a nice day!
- Kenji ^^
Answer:
Alkene and alkyne compounds are named by identifying the longest carbon chain that contains both carbons of the double or triple bond.
Explanation:
How many carbon atoms does one molecule of pyruvate contain?.
Hi!one molecule of pyruvate contains three carbon atoms.
Glycolysis produces two pyruvate molecule and there are three carbon atoms are present in each pyruvate molecule.
What is glycolysis ?Glycolysis is the process in which glucose is broken down to produce energy. It produces two molecules of pyruvate, ATP, NADH and water. The process takes place in the cytoplasm of a cell and does not require oxygen. It occurs in both aerobic and anaerobic organisms.
There are two pyruvate molecules produced at the end of glycolysis for every molecule of glucose metabolized. Therefore, two of the six original carbons will have been eliminated as CO2 at the end of this step.
The main purpose of glycolysis is to provide pyruvate for the trichloroacetic acid (TCA) cycle, not to make adenosine 5′-triphosphate.
Thus, there are three carbon atoms are present in pyruvate compound.
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What is the pH of a solution that has a [H+] of 2.5x10-OM.
Answer:
[tex]ph \: of \: a \: solution \: = - \: log \: ( {h}^{ + } ) \\ given \: ( {h}^{ + } ) = 2 \times {10}^{ - 5} \\ = ph = - log \: (2 \times {10}^{ - 5} ) \: = 5 - log \: 2 = 4.7[/tex]
Suppose you heat 4.24 g of S8 with 5.00 of Cl2, what would be the theoretical yield of S2Cl2? If the actual yield of S2Cl2 is 6.55g, what is the percent yield
S8 (l) + 4Cl2 (g) ------> 4S2Cl2 (l)
Answer:
Explanation:
Part 1: Theoretical yield
5.00 + 4.24 = 9.24 grams
Part 2: Percent yield
Percent yield = (actual yield)/(theoretical yield) * 100 = (6.55)/(9.24) * 100 = 70.9%
Where does reduction occur in an electrochemical cell?
O A. Cathode
O B. Porous barrier
O c. Anode
O D. Conducting wire
The solubility of a gas is 0.980 at a pressure of 116 kPa. What is the solubility of the gas if the pressure is decreased to 101 kPa, given that the temperature is held constant
The solubility of the gas when the pressure is decreased to 101 KPa at constant temperature is 0.853
Henry's lawThis states that the solubility of a gas in liquids at constant temperature is proportional to its pressure. Mathematically, it can be expressed as
S₁ / P₁ = S₂ / P₂
Where
S₁ is the initial solubility P₁ is the initial pressure S₂ is the new solubility P₂ is the new pressure How to determine the new solubilityFrom the question given above, the following data were obtained
Initial solubility (S₁) = 0.980Initial pressure (P₁) = 116 KPa New pressure (P₂) = 101 KPaNew solubility (S₂) =?S₁ / P₁ = S₂ / P₂
0.98 / 116 = S₂ / 101
Cross multiply
116 × S₂ = 0.98 × 101
Divide both side by 116
S₂ = (0.98 × 101) / 116
S₂ = 0.853
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What is the pH of a solution that has a [OH-] of 5.08x10^-5 M
Answer:
The pH of a solution that has a [OH-] of 5.08x10^-5 M is 5
Explanation:
just took the test
onedg2020
What element goes in the middle of the Lewis structure?
Answer:
The atom that requires the largest number of electrons to complete its octet
Explanation:
hope this helps
Only smart people can answer 50points
Answer:
can you give brainliest please
Molar mass of Mg(NO_3)_2
24+2(14+48)24+2(62)24+124148g/molMoles of solute:-
35/1280.27molNow
Volume of solution=0.1LMolarity:-
moles/volume0.27/0.12.7MIf two reactant particles collide, but bounce away unaffected, this is called a(n).
a)ineffective collision
b)effective collision
C)nonspecific collision
d)rearrangement of atoms
If two reactant particles collide, but bounce away unaffected, this is called an ineffective collision.
The Collision theoryAccording to the collsion theory, the reaction between particles occur as a result of the collsion of particles that have energy that is in excess of the activation energy.
Now if two particles, do not posses the activation energy, they collide and rebound from each other. This is called an ineffective collision.
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Which scenario would be classified as potential energy?
A car driving up a hill
A car sitting on top of a hill
The plane flying the skydiver to the jump mark
Answer:
a car sitting on top of a hill
Explanation:
if it's sitting it has no kinetic energy
Pure water freezes at 0° C (32* F) and boils at 100° C (212' F), a large range for a
liquid, and has an extremely high heat capacity. Why are these properties of water
important?
High specific heat capacity and long liquid range of water make it a good coolant especially in the nuclear plants
High specific heat capacity and long liquid rangeHigh specific heat capacity implies that it takes a very large amount of heat for the temperature of water to change by 1K. This means that water does not heat up easily and does not loose heat easily. Ideally, this informs the long liquid range of water.
These properties together make water a good coolant especially in the nuclear plants where temperatures could get very high.
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10 g of sodium hydrogen carbonate dissolved in 20 cm cubed water in a boiling tube .Lemon juice was added dropwise with shaking until there was no further change explain observation made in the boiling tube when the reaction was in progress
Answer:
it says the answer bro
look
Explanation:
How many moles of nitrogen gas are in 2.00 L of N2 gas at STP
The number of mole of nitrogen gas in the 16.8 L container is 0.75 mole
Data obtained from the question
Volume (V) = 16.8 L
Pressure (P) = STP = 1 atm
Temperature (T) = STP = 273 K
Gas constant (R) = 0.0821 atm.L/Kmol
Number of mole (n) =?
How to determine the number of mole
The number of mole of the nitrogen gas can be obtained by using the ideal gas equation as illustrated below:
PV = nRT
Divide both side by RT
n = PV / RT
n = (1 × 16.8) / (0.0821 × 273)
n = 0.75 mole
Thus, the number of mole of the gas present is 0.75 mole
Particle theory states that particles are attracted to each other??
True or false
Answer:
true
Explanation:
Students often have no experience with the idea that some things (particles) can’t be divided. If sand is ground up into tiny pieces it is still sand. There seems no reason why the dividing can’t keep on going to smaller and smaller pieces. This is often described as a continuous view of matter.
Even when children are introduced to the idea of matter being made of particles, most consider there is still ‘stuff’ between the particles and that something like air fills the empty space. After all, when liquid is poured from a glass so that it is empty it still contains air.
These ideas are further explored in ‘Hannah’s Question,’ a classroom practice vignette.
Research: Loughran, Berry, Mulhall & Gunstone (2001), Novick & Nussbaum (1981)
Particles are often assumed to behave in the same way as the substances they make up. For example students can believe that particles themselves can swell, shrink and melt or that the particles in stone are harder than the particles in rubber. Many students consider that ice molecules melt to little droplets of water.
Scientific view
The properties of matter can best be explained using a model in which all materials are composed of tiny particles (atoms, molecules and ions).
There is empty space between particles and particles are constantly moving (their speed is changed by temperature). The particles in solids and liquids are quite close to each other, while those in gases are a very long way apart. (There is commonly an increase in volume of at least 1000 fold when substances move from solid or liquid to gas).
Changes of state involving solids, liquids and gases as well as a range of other phenomena can be explained by changes in arrangement and speed of the particles.