Answer:
19 dollar fortnite card who wants it
Explanation:
and yes it is free
20.328 liters of oxygen gas, at STP, are produced by the decomposition of 0.605 moles of potassium chlorate.
What is STP?STP stands for standard temperature and pressure. STP refers to a specific pressure and temperature used to report on the properties of matter.
According to IUPAC( International Union of Pure and Applied Chemistry), it is defined as -
Temperature of 0 degree celsius (273K)Pressure of 1 atmIt is generally needed to test and compare physical and chemical processes where temperature and pressure plays an important role as they keep on varying from one place to another.
One mole of a gas under STP conditions occupies a volume of 22.4L.
Given,
Moles of potassium chlorate = 0.605 moles
From the reaction, 2 moles of potassium chlorate give 3 moles of oxygen.
Therefore, 1 mole of potassium chlorate will give 3÷2 moles of oxygen.
Thus, 0.605 moles give ( 3÷2) × 0.605 moles of oxygen
= 0.9075 moles of oxygen.
1 mole occupies 22.4 L of volume
So, 0.9075 moles will occupy 0.9075 × 22.4
= 20.328 L
Therefore, 20.328 liters of oxygen gas, at STP, are produced by the decomposition of 0.605 moles of potassium chlorate.
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if a gas occupies a volume of .06 L at 250 K, what will it’s volume be at 325 K?
Answer:
Explanation:
Explanation:
If you treat it as an ideal gas, then
P
V
=
n
R
T
where P is pressure, V is volume, n is number of moles, R is the gas constant and T is temperature in K.
If you assume pressure is constant, and we know that the amount of substance will remain constant, and of course the gas constant is a constant, then
V
varies directly with
T
. So for the two temperatures you can say:
V
1
.
T
1
=
V
2
.
T
2
V
2
=
V
1
.
T
1
T
2
T
2
, the higher of the two temperatures, will be 273 K and
T
1
will be 20 degrees lower, so 253 K.
Now plug in the numbers:
V
2
=
3
.
253
273
=
2.78
litres.
write an ionic half equation for the formation of hydrogen during this electrolysis
Answer:
A half-equation shows you what happens at one of the electrodes during electrolysis. Electrons are shown as e-. A half-equation is balanced by adding, or taking away, a number of electrons equal to the total number of charges on the ions in the equation.
When positive metal ions (cations) arrive at the negative electrode (the cathode), they gain electrons to form neutral metal atoms. This is called reduction. For example:
Pb2+ + 2e- → Pb
When negative non-metal ions (anions) arrive at the positive electrode (the anode), they lose electrons to form neutral atoms or molecules. This is called oxidation. For example:
2Br- → Br2 + 2e-
Writing half equations
Cations go to the cathode. They need to gain enough electrons to make them neutral. So an Al3+ ion needs to gain three electrons:
Al3+ + 3e- → Al
Half-equations for non-metal anions are more difficult to balance. For example, chloride ions make chlorine gas. Most non-metal elements formed in electrolysis are diatomic molecules (eg Cl2). For example:
Cl- → Cl2
Add in two electrons to balance the charge so that both sides have the same charge. The two electrons need to go on the right-hand side, so that both sides have an overall charge of -2. For example:
2Cl- → Cl2 + 2e-
Although your question lacks some information a general answer is provided
The ionic half equation = [tex]2H^{+} (aq) + 2e^{-} ----> H_{2} (g)[/tex]
The formation of hydrogen takes place at the negative electrode in a cell and the ionic half reaction that shows the formation of the hydrogen gas at the electrode is written as :
[tex]2H^{+} (aq) + 2e^{-} ----> H_{2} (g)[/tex]
Ionic half equation is the representation of the chemical activity ( reaction ) occurring at one of the electrodes of a cell. to balance a half reaction we add or remove electrons equal to charges on the ions.
Hence the Ionic half equation for the formation of hydrogen during electrolysis is written as ; [tex]2H^{+} (aq) + 2e^{-} ----> H_{2} (g)[/tex]
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Classify the following as homogeneous or heterogeneous mixtures, or pure
we
is a pure substance, whether it is an element or a
Mixture: homogeneous/
Substance
heterogeneous
Pure substanca
element companie
2.1 Sugar
2.2 Magnesium ribbon
2.3 Vegetable soup
2.4 Bath oil
2.5
Tin of assorted biscuits
2.6
Peanuts and raisins
2.7 Copper wire
2.8
Bicarbonate of soda
(Baking soda)
Explanation:
Sugar - Pure substance
Magnesium Ribbon - Pure Substance
Vegetable soup Heterogeneous mixture
Bath oil - Homogeneous mixture
Tin of assorted biscuits - Heterogeneous mixture
Peanuts and raisins - Heterogeneous mixture
Copper wire - Pure Substance
Bicarbonate of soda (Baking soda) - Pure Substance
A teacher tells the student to dlaw the same wave with double the frequency, while keeping the amplitude the same. How would the student draw the new wave?
Answer:
A.
Explanation:
Frequency is how often one complete cycle or wave takes place. Amplitude is the height of the wave from the midpoint to the crest.
The new drawing should have twice as many waves in the same period of time, with the same height wave.
Answer:
A.)
Explanation:
Frequency is how often one complete cycle or wave takes place. Amplitude is the height of the wave from the midpoint to the crest.
The new drawing should have twice as many waves in the same period of time, with the same height wave.
For the reaction N2+3H2⇌2NH3, the metals Fe and Mo used as catalyst. which of the following is NOT a reason that catalysts have no effect on the equilibrium state?
A. In the presence of a catalyst, the same amounts of reactants and products will be formed as would form in the uncatalyzed reaction.
B. The addition of a catalyst speeds the rate of both the forward and reverse reactions, resulting in no change to the equilibrium.
C. Catalysts reduce the required activation energy and allow a reaction to reach equilibrium more quickly.
D. Catalysts get used up in the formation of the product.
The calorimeter pictured below shows the final temperature after calcium chloride was added to water. (The initial temperature was 25°C.) Which of the following best describes what occurred within the calorimeter?
A. Only Bond forming occurred
B. The bonds that formed were the most part stronger than the bonds that were broken
C. More energy was absorbed in breaking bonds than was released when new bonds form
D. As the powder dissolved, the breaking of bonds released energy
Answer:
The answer is acctualy B
Explanation:
I did the gizmo
The calorimeter has the final temperature rise with the addition of calcium chloride as formation of bonds stronger than the bonds that are broken. Thus option B is correct.
There has been increased in the temperature as the breaking of bonds has released energy in the solution. With the high energy in the solution, the part of the energy has been used for the bond formation. However the rise results as the bonds formed are stronger than the bonds broken.
The calorimeter has the final temperature of [tex]\rm 52^\circ C[/tex]. The addition of calcium chloride results in a rise in temperature. This has resulted in the formation of bonds stronger than the bonds that are broken. Thus option B is correct.
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Which choice represents a compound?Required to answer. Single choice.
(1.5 Points)
Cu
Fe
CO
Br
Answer:
CO
Explanation:
Elements will only one capital letter, that may/may not have a lower case letter after it. CO has a capital letter followed by another capital, so it's a compound
How many protons are in an oxygen atom.
Answer:
Hello
there are 8 protons in oxygen atom
Explanation:
thanks...hope it helps
A student has a salt water solution. When the student adds more salt to the solution it completely dissolves. What type of solution did the student start with?
unsaturated
saturated
supersaturated
Answer:
SaturatedExplanation:
Asaturated solution is a solution that contains the maximum amount of solute that is capable of being dissolved. Table salt (NaCl) readily dissolves in water.
Calculate the change in heat (Q) that occurs when 7.58grams of steam at 101°C cools to liquid water at 40°C. (cp = 4.184 J/g°C)
Answer:
Q = 19065.4 J
Explanation:
Q₁ = the required energy for phase change of H₂O from vapor to liquid
Q₁ = mass of H₂O * heat of vaporization
Q₁ = 7.58 g * 2260 J/g
Q₁ = 17130.8 J
Q₂ = energy required to cool the water fro 101°C to 40°C
Q₂ = mass of H₂O * specific heat of H₂O * ΔT
Q₂ = 7.58 × (4.184 J/gC) × (101 - 40)
Q₂ = 1934.6 J
Q = Q₁ + Q₂
Q = (17130.8 + 1934.6) J
Q = 19065.4 J
What are the properties of CuF2?
HELP WITH THIS WORD PROBLEMStudents want to gather evidence for the claim that the number of atoms present before a chemical reaction is equal to the number of atoms present after the chemical reaction. They decide to react vinegar and baking soda in a sealed plastic bag. Which of the following would provide the evidence the students need?
The mass of the plastic bag, baking soda, and vinegar before the reaction was equal to the mass after the reaction.
Bubbles were produced during the reaction, which meant that a gas was being produced
.The plastic bag did not change in any way, indicating that it was not involved in the reaction.
The mass of the baking soda was exactly equal to the mass of the vinegar used to create the chemical reaction.
Cars require multiple energy transformations. Gasoline is put in the tank to burn for the car to go. The car battery provides the energy for other functions of the car as well.
Which of the following type of energy is NOT used in a car?
A.Chemical Energy
B.Electrical Energy
C.Kinetic Energy
D.Sound Energy
PS: I Need This Right Now, Please Help You Will Get 10 Points For Answering The Question. Give TRUE HONEST Opinion That YOU Think Is Right. This Is Due Today ( Friday March 5th 2021 ) America’s Date.
The energy is found to has a specific physical meaning. There are different forms of energy on earth. The ability to do the work is defined as the energy. Here chemical energy is not used by the car. The correct option is A.
What is Kinetic energy?The measure of the work an object can do by virtue of its motion is defined as the kinetic energy. To accelerate an object, it is very important to have the kinetic energy. Activities like walking, jumping, and falling involve kinetic energy.
The energy which is stored in the molecules and atoms and is converted to other forms of energy is defined as the chemical energy. The fuel and air are chemical energy which is transformed to mechanical for a race car. Here kinetic energy inside the engine is transformed from chemical energy to mechanical energy.
So electrical energy, kinetic energy and sound energy are used by cars.
Thus the correct option is A.
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answer pls ill give brainly
How is energy from the sun used as food energy by organisms in an ecosystem?
Energy from the sun is absorbed as heat by consumers.
Energy from the sun is absorbed by fungi, and it is then passed on to consumers.
Energy from the sun is converted into food energy by producers, which is then passed on to consumers.
Energy from the sun is converted into food by consumers, which is then passed on to producers.
Answer:
its absorbed by heat from consumers
Balance the equation by putting the correct number in front of each compound. You can work this out mathematically or by drawing pictures on a piece of paper like the videos.
AgCl + Cu --> Ag + CuCl2 cleaning silver
Give me lil reasoning so I know your not lying for points
:(
(I’ll mark you as brainlister )
Answer:
C
Explanation:
An inverse relationship means that as one increases the other decreases. From the negative slope of this graph, you can tell that as volume increases, pressure decreases. If you look at the data point for 20 on the volume axis, it matches up with about 240 on the pressure axis.
Calculate the molarity of a solution containing 21.9g of MgCl, in enough water to
make a 750.mL solution.
Blood is carried to the lungs by the
Answer:
heart
Explanation:
Answer:
arteries carry blood to the lungs
What is the volume in liters of 3.80 moles of CO2gas at STP?
Answer:
V = 85.2
Explanation:
STP = 273K and 1 atm
Considering what we know about STP, we get the moles, temperature, and pressure. Using the ideal gas law we can find the volume (PV = nRT). Plug in our variables: (1 * V = 3.80 * R * 273). Since we are dealing with atm and not kPA or mmHg, we use the constant for atm (0.0821) which we use for R. (So.. now our equation is 1 * V = 3.80 * 0.0821 * 273). We now multiply the right side to get 85.17054. So... V = 85.2 considering sigificant figures (this is the part where I am the least sure of, since I havent done sig figs in a while)
does copper react more quickly with oxygen than iron?
Answer:
copper rally isn't useful like iron we have cars and all that but copper is made for like copper coins and wires
Explanation:
Iron is more reactive than copper as copper has less outer shells than iron so copper is less likely to react with another element as it has a stronger hold over the electrons.
Ionic/Covalent=NaBr
Answer:
NaBr is ionic.........
Answer:
NaBr is ionic
(in the image is lewis structure and simplified)
Hope it helps you ✨
- Wind and water sometimes carry
topsoil from one place to another. A
word that describes this process is?
A Substratum
B> Flow
Erosion
D Decay
Answer:
erosion is the right answer
80g of Sodium react with 40g of Chloride to produce a product of Sodium Chloride. How many grams of sodium chloride will be present after this chemical reaction?
Na2 + 2Cl2 —> 2NaCl2
Students in Ms.Tillman’s class added 100 grams of copper to 15 grams of oxygen. A chemical reaction occurred produced copper oxide, as shown in the equation below
2 Cu + ___O2 —> 2 CuO
What type of reaction is this?
How many total grams should be present at the end of the chemical reaction?
what is similar about the comparison of pluto and ceres?
Answer:Difference between Ceres and Pluto
Nestled in the asteroid belt between Mars and Jupiter, Ceres is a tiny loner, while Pluto — in the Kuiper Belt at the edge of the solar system — is nearly three times as big and hosts a handful of moons. A mixture of rock and water ice dominates Ceres' landscape, while methane and nitrogen ices cover Pluto
Explanation:
Define what a precipitate is and identify it in the reaction below Pb(NO3)3(aq) + 3KI(aq) --> PbI3(s) + 3KNO3(aq)
Answer:
PbI₃ is the precipitate in the reaction
Explanation:
A precipitate is defined as a substance than appears after a chemical reaction because of the formation of an insoluble compound.
You can identify yhe precipitate in a chemical reaction because its state is solid (s). For example, in the reaction:
Pb(NO₃)₃(aq) + 3KI(aq) → PbI₃(s) + 3KNO₃(aq)
The Pb(NO₃)₃ and KI are soluble salts (Because are in (aq) medium) but the reaction produce a solid, PbI₃ and a soluble salt, KNO₃. The solid,
PbI₃ is the precipitate in the reactionStep 7: Measure Pressure and Volume with the Book
and 2 kg of Weight
Total the mass on the syringe. Record it in the
correct row of the data table.
kg
Answer:
1) 2.498
2) 1.27
3) A) 40.5
4) 51.4
Explanation:
Answer: 2.498
Explanation:
I’m taking it rn and got it wrong so y’all could get it right
How many atoms in this molecule have a tetrahedral molecular geometry?
In the given molecular geometry, two atoms (C and O) have a tetrahedral molecular geometry.
What is tetrahedral geometry?The tetrahedral geometry is formed when there are four bonds all on one central atom. According to the VSEPR theory, the bond angles between the bonds are 109.5°.
Methane has tetrahedral geometry and the four equivalent bonds in 3 D corresponding to the four corners of a tetrahedron centered on the carbon atom.
In the given molecule, the carbon is attached to three hydrogens and one carbon atom with bond angles of 109.5° have a tetrahedral geometry and shape.
The oxygen atom is attached to two carbon atoms with bond angles of approximately 104.5° and contains two lone pairs. The oxygen atom has a tetrahedral molecular geometry. The oxygen atom is of the form AX₂E₂ and has bent shapes similar to the shape of water.
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Two atoms (C and O) in the specified molecular geometry have a tetrahedral molecular geometry.
When four bonds are present on the same core atom, the tetrahedral geometry is created. The bond angles between the bonds are 109.5° in accordance with the VSEPR hypothesis.
The four analogous bonds in three dimensions that make up methane correspond to the four corners of a tetrahedron that is centred on the carbon atom. Methane has a tetrahedral shape.
One carbon atom with a bond angle of 109.5° and a tetrahedral geometry makes up the carbon in the given molecule, which is joined to three hydrogen atoms.
Thus, with bond angles of roughly 104.5° and two lone pairs, the oxygen atom is joined to two carbon atoms. Tetrahedral molecular geometry characterises the oxygen atom.
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Which statement best describes how antibiotics are used?
A. Antibiotics are added to the public water supply to prevent people
from getting sick.
B. Antibiotics are used to kill animals that commonly spread
diseases to people.
O C. Antibiotics are given to cure infections caused by bacteria or other
microorganisms.
D. Antibiotics are given to help treat infections caused by viruses.
Answer:
C
Explanation:
I got it right on a p e x
A student wants to carry out flame tests on these three chemicals. Describe how to carry out a flame test.
Answer:
Flame test is one of the chemical tests that can be used to identify a metal or metaloid
in an ionic compound.
Explanation:
Flame test is guided by a principle that when an unknown metal is heated, heat of the flame converts the metal ions into atoms which become excited and emit visible light.
To carry out flame test in a laboratory the following instruments are required:
--> a wire loop
--> Bunsen burner
--> the chemical compound under observation
--> protective wears.
The procedure involves the following steps:
--> turn on the Bunsen burner and adjust the barrel of the burner roll the flame is blue.
--> using a clean wire loop deep into a beaker containing hydrochloric acid.
--> to ensure that the loop is clean, it will give the same blue colour of the flame when heated.
--> deep the loop in the acid again and then use it to pick few grains of the metal.
--> place the wire loop in the side of the flame and observe the colour of the flame.
Result of flame tests of some metallic ion will show the following:
--> sodium ion will give yellow colour flame
--> potassium ion will give lilac colour flame
--> calcium ion will give orange-red colour flame
the reaction 2F2+ 2H2O + 4HF + 02 find the number of moles of oxygen produced from 10 moles of fluorine
Answer:
20 moles of Oxygen
Explanation:
2F2 + 2H20 -> 4HF + O2
We have 10 moles of fluorine. Based on the reaction equation, we see that:
n O2 = 2 * n F2 (n is the number of moles)
=> n O2 = 2 * 10 = 20 (moles)
Because of this, the number of moles of oxygen is 20 moles.