a mixture can be separated by a filter
7. Which is an example of a good insulator?
iron
copper
silver
rubber
Answer:
Rubber is an insulator.
Remaining three are metals and hence conductors.
Perform the following
mathematical operation, and
report the answer to the
correct number of significant
figures.
0.0030 × 8.65= [?]
Answer: 0.02595 is your answer I looked it up
Answer:
.03
Explanation:
How many pounds of manganese are in 1.261 tons of Mn2O3?
Answer:
2000pound
Explanation:
Manganese metal is produced from the manganese(III) oxide, Mn2O3, which is found in manganite, a manganese ore. The manganese is reduced from its +3 oxidation state in Mn2O3 to the zero oxidation state of the uncharged metal by reacting the Mn2O3 with a reducing agent such as aluminum or carbon. How many pounds of manganese are in 1.261 tons of Mn2O3? (1 ton = 2000 pounds)
About 40 different substances called organophosphorus compounds are registered in the United States as insecticides. They are considered less damaging to the environment than some other insecticides because they breakdown relatively rapidly in the environment. The first of these organophosphorus insecticides to be produced was tetraethyl pyrophosphate, TEPP, which is 33.11% carbon, 6.95% hydrogen, 38.59% oxygen, and 21.35% phosphorus. It has a molecular mass of 290.190.
A quantity can be converted from one unit of measurement to another while maintaining its value. There are 2522 pounds of manganese in 1.261 tons of [tex]\rm Mn_2O_3[/tex].
It is a fundamental idea that is applied in many different disciplines such as science, engineering, math and daily life. To complete a conversion, it is necessary to know the conversion factor – the numerical relationship between the two units of measurement. With the help of this factor, you are able to convert units while keeping the value constant.
To convert tons to pounds we need to know that 1 ton is equal to 2000 pounds.
Given that you have 1.261 tons of [tex]\rm Mn_2O_3[/tex], we can calculate the number of pounds as follows:
Number of pounds = 1.261 tons * 2000 pounds/ton
Number of pounds = 2522 pounds
Therefore, there are 2522 pounds of manganese in 1.261 tons of [tex]\rm Mn_2O_3[/tex].
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What kind of reaction is symbolized by AB + C → CB + A?
O A. Synthesis
O B. Single replacement
O C. Double replacement
O D. Decomposition
Answer:
B. Single replacement.
Explanation:
The A in compound AB was replaced by C to make CB. Since there was only one instance of replacement, it is a single replacement reaction.
Complete the chemical equations and balance them
HCl + KOH → __________ + ____________
H₃PO₄ + NaOH→__________ + ____________
H₂CO₃+ Ca(OH)₂→__________ + ____________
Answer:
KCl+H2O
Na3PO+H2O
CaCO3+H2O
This is an impossible formula. If it were real, determine the molar mass of:
Fe1S1O5
Ammonium lauryl sulfate has a molar mass of 283.43 g/mol.
What is ammonium lauryl sulfate, and how does it work?Ammonium dodecyl sulfate is another name for it. It's in the shampoos we use on our hair. Both polar and non-polar solvents can dissolve it. It can irritate the skin at times.
Thus, the ammonium lauryl sulfate molar mass is 283.43 g/mol.
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Choose all the right answers.
factors produce changes in Earth's surface? You can choose multiple, giving 60 points
A. Erosion
B. Folding
C. Faulting
D. Weathering
Answer:
The answer is Erosion, Weathering,
Explanation:
These all seem to be correct but i know for a fact those two are correct.
A truck tire at 82.0L at 32.5°C and 1.9 atm has a temperature change to-15.4°C and a pressure change to 770.0 mmHg. Calculate how much the volume of the
air in the tire will change.
Answer:
+ 47.68 Liter change in volume to final volume 129.68 L
Explanation:
P1V1/T1 = P2V2/T2 RE-ARRANGE TO:
P1V1/T1 * T2/P2 = V2 (T must be in Kelvin)
1.9 * 82 / (273.15 + 32.5) * (273.15-15.4)/ (770/760) = 129.68 L
129.68 - 82=47.68 L change
What happens to the pressure and the molecules inside a unicycle tire that is being pumped up?
A. The pressure decreases, and the molecules slow down.
B. The pressure increases, and the molecules collide with the tire's inner surface.
C. The pressure increases, and the molecules slow down.
D. The pressure decreases, and the molecules collide with the tire's inner surface.
The temperature of 2,000.0 g water is raised 3.00°C. How much
energy is transferred to the water. Use the formula below and use your
notes. The specific heat (Cp) for water is 4.18 J/g • °C. Round to three
significant digits. See your notes and slides.
Answer:
25 080 j ( Rounded to 25100 j)
Explanation:
FROM THE EQUATION
?? = 4.18 * 2000 * (3) = 25 080 j
Which type of solid conducts electricity the best?
• Ionic
• Molecular
• Network
• Metallic
1- If 154.0 grams of potassium metal reacts with excess water, then how many grams of
potassium hydroxide and hydrogen gas are formed? What volume of hydrogen gas, in liters, is formed at STP? Be sure to balance the reaction first.
___K(s) + ____H2O(l) → ____KOH(aq) + ____H2(g)
2- The burning of solid sulfur in air produces sulfur dioxide gas.
S + O2 → SO2
Balance the reaction. How many moles of sulfur dioxide does the burning of 3 moles of sulfur form? Calculate the volume of sulfur dioxide produced at STP.
So
4K+4H_2O—⟩4KOH+2H_2Moles of Potassium
154/393.9molSee molar ratio is same for K,KOH,H_2O i.e 4 .
So same moles of allMass of Water
3.9(18)70.2gMass of KOH
56(3.9)218.4g#2
S+O_2—»SO_2Balanced already
3 mols of S form 3 mol SO_2
At STP 1mol=22.4L
Volume=22.4(3)=67.2Lpleaseeeeeeeeeeee help this is due today
The final temperature of the sample of gas is 689.65 Kelvin.
What is the relation between temperature and pressure?Relation between the temperature and pressure will be represented by the ideal gas equation PV = nRT, and for this question required equation is:
P₁/T₁ = P₂/T₂, where
P₁ & T₁ are the pressure and temperature of the initial sample.
P₂ & T₂ are the pressure and temperature of the final sample.
Pressure is in mmHg and on putting values from the question on the above equation, we get
T₂ = (810)(390.8) / (760) = 416.5 degree C = 689.65K
Hence required temperature of the sample is 689.65K.
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Reactions
Predict the products for the single replacement reactions given. Check to see that the equations are
balanced.
Ca + MgCl2 →?
-
O CaCl2 + Mg
O Ca + Cl2
0 Mg + Cl2
CaCl + Mg
Answer:
answer in picture
Explanation:
The balanced chemical equation will be Ca + MgCl2 → CaCl2 + Mg.
What is balanced chemical equation?An equation that has the same quantity of atoms on both sides of the arrow would be said to represent a balanced chemical reaction.
The given equation is Ca + MgCl2 →
It is known that when Ca is reacted with magnesium chloride ( MgCl2) then it will form calcium chloride (CaCl2 ) and magnesium.
Ca + MgCl2 → CaCl2 + Mg.
It can be seen that, calcium has one atom in the reactant side and one atom in product side. On the other hand, chlorine has one atom in reactant side as well as product side.
Hence, the reaction will be balanced.
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If you had five moles of sodium chloride how many moles of sodium hydroxide could you produce?
What is the [H+] in a solution if the [OH-] = 5.42 x 10-5 M
The hydrogen ion concentration is [tex]\rm[H^{+} ] = 1.8 \times 10^{-10}[/tex] M .
What is pH scale ?The pH scale is used to rank solutions in terms of how acidic or how basic they are.
It indicates the concentration of hydrogen ions (H+) and hydroxide ions (OH-) in a solution.
These ion concentrations are equal in pure water, which has a pH of 7.
The hydrogen ion and hydroxide ion are related as
[tex]\rm[H^{+} ] = \dfrac{1 \;\times 10^{-14} }{[OH^{-}] }[/tex]
[tex]\rm[H^{+} ] = \dfrac{1 \;\times 10^{-14} }{[5.42\times10^{-5} ] }[/tex]
[tex]\rm[H^{+} ] = 1.8 \times 10^{-10}[/tex] M
The hydrogen ion concentration is [tex]\rm[H^{+} ] = 1.8 \times 10^{-10}[/tex] M .
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if a helium filled ballon has a volume of 3.4l at 25°c and 1.18atm., what is its volume at STP?
Answer:
3.711 L
Explanation:
The formula you need to use is the following:
[tex]\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}\\[/tex]
3.4L / 298 K = V2 / 273 K
V2 = 3.711 L
50 POINTS PLEASE ANSWER QUICK (bad answers will be reported)
Donna is studying phase changes. She claims that since the three phases have different amounts of energy, molecules in substances gain or lose energy only during phase transitions. What is incorrect about this claim?
Molecules gain or lose energy during any temperature change, not just phase changes.
Molecules do not have any energy changes, because they have a set amount of energy all the time.
Molecules are constantly losing energy, no matter what phase change is happening.
Energy levels are not related to phase changes.
Answer: Molecules gain or lose energy during any temperature change, not just phase changes.
Explanation:
If you think of a heating or cooling curve, even when there isn't a phase change, the kinetic energy of the particles is still changing.
A small bar magnet is placed in the magnet field of a larger bar magnet that position marked why in the diagram below assuming the small bar mad and it is free to rotate how would it be positioned
Answer:
See below
Explanation:
The large bar magnet is positioned with S on the Left
the small magnet will position itself similar this with N on the right S on the left (opposites attract)
What do you predict will happen to the volume inside a container when pressure & temperature remains constant but the number of particles inside is increased? WHY?
Answer:
increase
Explanation:
The Ideal Gas Equation
PV = nRTV = nRT/PV ∝ nThe volume of a gas is directly proportional to the number of moles it contains. Hence, if the number of particles is increased, then the volume inside the container will increase
Make sure your answer includes TWO decimal places. this is an impossible formula. If it were real, determine the molar mass of:
KBr•7H2O
Molar mass is the summation of the atomic mass of the individual atoms. The molar mass of KBr•7H₂O is 244.99.
What is atomic mass?Atomic mass or weight is the number of protons and neutrons in the atom of the individual element. The atomic masses are used to calculate the molar mass of the compound.
The compound KBr•7H₂O: 1 K + 1 Br + 14 H + 7O
Inserting the atomic masses of the individual atoms as:
= 1 (39.09) + 1 (79.90) + 14 (1.00) + 7(16)
= 39.09 + 79.90 + 14.00 + 112
= 244.99
Therefore, 244.99 is the molar mass of KBr•7H₂O.
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Name the following branched alkanes. Two of these are isomers of each other, put a star ★ in their boxes.
Answer:
Structure 1:
The longest chain is made up of 4 carbons (butane). There is a 1-carbon branch (methyl). The lowest possible position of the branch is on the 2nd carbon. This makes the alkane: 2-methylbutane.
Structure 2:
The longest chain is made up of 7 carbons (heptane). There is a 2-carbon branch (ethyl). The lowest possible position of the branch is on the 4th carbon. This makes the alkane: 4-ethylheptane.
Structure 3:
The longest chain is made up of 4 carbons (butane). There are 2, 1-carbon branches (dimethyl). The lowest possible position of both branches is on the 2nd carbon. This makes the alkane: 2,2-dimethylbutane.
Structure 4:
The longest chain is made up of 3 carbons (propane). There are 2, 1-carbon branches (dimethyl). The lowest possible position of both branches is on the 2nd carbon. This makes the alkane: 2,2-dimethylpropane.
Structure 5:
The longest chain is made up of 6 carbons (hexane). There is a 1-carbon branch (methyl). The lowest possible position of the branch is on the 2nd carbon. This makes the alkane: 2-methylhexane.
Structure 6:
The longest chain is made up of 3 carbons (propane). There is a 1-carbon branch (methyl). The lowest possible position of the branch is on the 2nd carbon. This makes the alkane: 2-methylpropane.
The isomers are structures 1 and 4 because they contain the same amount of carbons (5) and hydrogens (12) while assuming different structures.
A gas has a volume of 1400 mL at a temperature of 20.00 K and a pressure
of 101.3 kPa. What will be the new volume when the temperature is
changed to 40.00 K and the pressure is changed to 50.65 kPa?
The question is Given:Gas×Temperature×Pressure
Gas=1400ml
Temperature=20.00K
Pressure=101.3kpa
140ml×20.00K×101.3 K Pa
total =6,00.00
and when the volume of temperature changed to 40.00 K and the pressure is changed to 50.65 kPa.
Solution will 40.00 K× 50.65 kPa
total of the changes is 200.
Please Help Me with this
Answer:
compared to sodium, silicon has a higher ionization energy meaning it takes more energy to remove electrons.
Explanation:
hope this helps
can u please give me and Brainlist
What is the molarity of a solution that has 450 grams of sodium chloride in 800.0 mL of
water?
Answer:
= 9.6125M
Explanation:
data:
volume = 800ml
800/ 1000 = 0.8dm^3
molar mass of NaCl = 23 + 35.5
= 58.5g
mass of NaCl = 450 g
moles= ?
molarity = ?
solution:
no. of moles = [tex]\frac{given mass}{molar mass}[/tex]
= 450 / 58.5
= 7.69 moles
now, molarity = [tex]\frac{moles}{volume in dm^3}[/tex]
= 7.69 / 0.8
molarity= 9.6125 M
At equilibrium,
a, the forward reaction rate is lower than the reverse reaction rate.
b. the forward reaction rate is higher than the reverse reaction rate.
c. the forward reaction rate is equal to the reverse reaction rate.
d. po reactions take place.
[tex]{\large{\red{\mapsto{\maltese{\underline{\green{\boxed{\blue{\underbrace{\overbrace{\pink{\pmb{\bf{Answer:}}}}}}}}}}}}}}[/tex]
C. the forward reaction rate is equal to the reverse reaction rate
Chemical equilibrium is dynamic in nature and it can be attained only if the system is a closed one. At equilibrium the forward reaction rate is equal to the reverse reaction rate. The correct option is C.
What is chemical equilibrium?The state of a system in which the measurable properties of the system do not undergo any further noticeable change under a particular set of conditions is called the state of equilibrium. The properties like pressure, concentration, etc. is constant at equilibrium and remain unchanged thereafter.
An equilibrium can be attained from either direction, i.e., from the direction of the reactants as well as from the direction of the products. At equilibrium the rate of forward reaction is equal to that of the backward direction.
In forward reaction, the reactants are converted into products and in backward reaction, the products are changed into the reactants.
Thus the correct option is C.
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Charle's Law
At 225 °C a gas has a
volume of 400 mL. What is
the volume of this gas at 127
°C?
Given:
Unknown:
Formula:
Solution:
Final answer:
Convert temperature to Kelvin
225°C=498K127°C=400KConvert vol to L
400mL=0.4LApply Charles law
V1T_2=V2T_10.4(400)=498V_2160=498V_2V_2=0.32L=320mLAnswer:
Given:[tex]V_{1} = \text{400.0 mL}[/tex]
[tex]T_{1} = 225.0^{\circ}\text{C + 273.15 = 498.15 K}[/tex]
[tex]T_{2} = 127.0^{\circ}\text{C + 273.15 = 400.15 K}[/tex]
Unknown:[tex]V_{2}[/tex]
Solution:[tex]\dfrac{V_{1}}{T_{1}} = \dfrac{V_{2}}{T_{2}}[/tex]
[tex]V_{2} = V_{1} \times \dfrac{T_{2}}{T_{1}}[/tex]
[tex]V_{2} = \text{400.0 mL} \times \dfrac{\text{400.15 K}}{\text{498.15 K}}[/tex]
[tex]\boxed{V_{2} = \text{321.3 mL}}[/tex]
Therefore, the volume of the gas at 127.0°C is 321.3 mL
[tex]\begin{gathered}\\\end{gathered}[/tex]
Define ionization energy. Describe how ionization energy impacts ionic bonding.
Answer: I can’t explain how it impacts ionic bonding but I can tell you what ionization energy is.
Explanation:
ionization energy, also called ionization potential, in chemistry and physics, the amount of energy required to remove an electron from an isolated atom or molecule.
What happens to the distance between molecules when a substance changes from a liquid to a gas? Why?
Answer: As the substance changes from a liquid to a gas, bonds within its molecules almost dissapear and the average distance between them.
Explanation:
Help me out Anyone know these Answers ?