Answer:
B
Explanation:
I took the test and GOT an A
Lance wants to separate out the salt from a solution of salt water how can he do this
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Answer: Boiling the water
I hope this helped!
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What is the force required to move a bowling ball with a mass of 6kg at an
acceleration of 2.5 meters per second squared?
Answer: 15N
Explanation:
The formula to calculate force in this scenario will be:
Force = Mass × Acceleration
where,
Mass = 6kg
Acceleration = 2.5m/s
We then put the values of mass and the acceleration in the formula. This will be:
F = ma
F = 6 × 2.5
F = 15N
Therefore, the force required to move the bowling ball will be 15Newton.
For the reaction 1Pb(NO3)2 + 2KI −−> 1PbI2 + 2KNO3, how many moles of lead iodide (PbI2) are produced from 300.00 g of potassium iodide (KI)?
Answer:
moles PbI₂ produced = = 0.9 mole (1 sig. fig.)
Explanation:
Given Pb(NO₃)₂ + 2KI −−> PbI₂ + 2KNO₃
300g ?moles
moles KI = 300g KI/166g/mol = 1.81 mole KI
Rxn ratio for KI and PbI₂ => 2:1
∴ moles PbI₂ produced = 1/2(1.81 mole) = 0.9036144 mole (calculator answer)
= 0.9 mole (1 sig. fig.)
If 5.0 g of copper metal reacts with a solution of silver nitrate, how many grams of silver metal are recovered?
Cu + Ag(NO3)2=Cu(NO3)2 + Ag
Answer:
16.9g
Explanation:Cu+2AgNO3→2Ag+Cu(NO3)2
Cu will likely have a +2 oxidation state. It is higher in the activity series than Ag, so it is a stronger reducing agent and will reduce Ag in a displacement reaction. Then you need to balance the coefficients knowing than NO3 is -1 and Ag is +1.
Then to calculate the theoretical yield you need to compare moles of the reactants:
m(Cu)=5g
M(Cu)=63.55
n(Cu)=5/63.55=0.0787
By comparing coefficients you require twice as much silver: 0.157mol
n(Ag)=0.157
M(Ag)=107.86
m(Ag)=0.157x107.86=16.9g
Hence, the theoretical yield of this reaction would be 16.9g
What is the correct formula for the compound made of magnesium and nitrogen
Answer:
Mg3N2
Explanation:
it has an inorganic compound for Magnesium and Nitrogen. if you put this two together it will the compound Magnesium nitride.
Three facts about Dalton’s Model of the Atom:
Explanation:
Everything is composed of atoms, which are the indivisible building blocks of matter and cannot be destroyed. All atoms of an element are identical. The atoms of different elements vary in size and mass. Compounds are produced through different whole-number combinations of atoms.
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Michelle learns in science class that simple machines such as an inclined plane can change the amount of force needed to lift heavy objects. She decides to test this with an experiment.
Michelle chooses a 10 kg weight. She sets up a ramp made of smooth metal that makes an angle θ with the floor. She attaches a spring scale to the weight and the top of the ramp in order to hold the weight in place. She records the force from the spring scale, then changes θ and records it again. She repeats this several times.
In this experiment, what is the outcome variable (dependent variable)?
A.
the angle θ between the ramp and the ground
B.
the mass of the weight
C.
the material the ramp is made of
D.
the amount of force on the spring scale
PLEASE I NEED HELP ON THIS RN AND IT'S DUE TODAY!!!!!!!!
IF YOU POST ANY LINKS THAT ARE PERM-BLOCKED, I WILL REPORT YOU, TAKE YOUR POINTS AWAY, DELETE YOUR ANSWER, AND PROBABLY BAN YOU! IF YOU DO NOT KNOW, DON'T ANSWER!!!!!!!
Answer: the amount of force on the spring scale
Explanation:
Rank the following elements by decreasing metallic character: Cesium (C's), Bromine (Br), Osmium (Os), Tin (Sn)
Answer:
Cs, Os, Sn, Br
Explanation:
Metallic character increases to the left and down the periodic table.
Solution (a) has a hydrogen ion concentration of 2.7 x 10^-3 and solution (b) has a hydrogen ion concentration of 4.1 M. What are their pH and say if they are acids or bases.
Answer: a) pH = 2.56 , acidic
b) pH = 2.38, acidic
Explanation:
pH or pOH is the measure of acidity or alkalinity of a solution.
pH is calculated by taking negative logarithm of hydrogen ion concentration.
[tex]pH=-\log [H^+][/tex]
a) [tex][H^+]=2.7\times 10^{-3}[/tex]
Putting in the values:
[tex]pH=-\log[2.7\times 10^{-3}][/tex]
[tex]pH=2.56[/tex]
Thus as pH is less than 7, the solution is acidic.
b) [tex][H^+]=4.1\times 10^{-3}[/tex]
Putting in the values:
[tex]pH=-\log[4.1\times 10^{-3}][/tex]
[tex]pH=2.38[/tex]
Thus as pH is less than 7, the solution is acidic.
4NH3(g) + 6NO(g)→5N2(g) + 6H2O(g) Using the balanced equation calculate the mass of N2 produced from 100 grams of NH3 racing with an unlimited supply of NO.
Here's link to the answer:
bit.[tex]^{}[/tex]ly/3a8Nt8n
Michell saw a model of a skeleton in a science store. She counted the bones in the skeleton. There were 206. Which is NOT something the 206 bones in our skeletons do?
A. support the body
B. help the body move.
C. regulate temperature.
D. protect internal organ
Help me!!!
Answer:
C, regulate temperature
Explanation:
Bones take no part in temperature regulation throughout the body.
Find the number of moles in 1.00 x 1023 atoms of chromium.
Answer:
0.17 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
We have
[tex]n = \frac{1.00 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{1}{6.02} \\ = 0.166112[/tex]
We have the final answer as
0.17 molesHope this helps you
the volume of alcohol present in 409ml of 11%
Answer:
Amount of Alcohol volume present in solution = 44.99 ml
Explanation:
Given:
Total volume of solution = 409 ml
Amount of Alcohol percentage present in solution = 11%
Find:
Amount of Alcohol volume present in solution
Computation:
Amount of Alcohol volume present in solution = Total volume of solution x Amount of Alcohol percentage present in solution
Amount of Alcohol volume present in solution = 409 x 11%
Amount of Alcohol volume present in solution = 409 x 0.11
Amount of Alcohol volume present in solution = 44.99 ml
Name the first 20 elements on the periodic table
Answer:
HYDROGENHELIUMLITHIUMBERYLLIUMBORON CARBONNITROGENOXYGENFLUORINENEON SODIUMMAGNESIUMALUMINUMSILICONEPHOSPHORUSSULFURCHLORINEARGONPOTASSIUMCALCIUMd. 2 5. How many moles of HCl are needed to produce 25 moles of KCl in the presence of excess potassium permanganate? a. 16 b. 32 c. 5 d. 200
Answer:
d. 200.
Explanation:
The reaction is:
2KMnO4 + 16HCl ----> 2KCl + 2MnCl2 + 8H2O + 5Cl2
So 2 moles of KCL are produced form 16 moles of HCL
So 25 moles KCL are made from 25 * (16/2) HCl.
= 25 * 8
= 200 moles. HCl.
What hypothesis can be tested using the experimental set up shown in the picture? A) Light travels faster than sound. B) Light travels in a straight line. C) Light can pass through opaque objects. D) Light can only pass through transparent objects.
Answer:
its B.)
Explanation:
B.) Light travels in a straight line. :))
HELPPP!!! What is the volume of a 1.31 moles sample of gas if the pressure is 904 mmHg and the temperature is 37. degrees Celsius?
Answer:
27.99 dm³
Explanation:
Applying
PV = nRT................ Equation 1
Where P = Pressure, V = Volume, n = number of mole, R = molar gas constant, T = Temperature.
From the question, we were aksed to find V.
Therefore we make V the subject of the equation
V = nRT/P................ Equation 2
Given: n = 1.31 moles, T = 37°C = 310K, P = 904 mmHg = (904×0.001316) = 1.1897 atm
Constant: R = 0.082 atm.dm³/K.mol
Substitute these values into equation 2
V = (1.31×310×0.082)/(1.1897)
V = 27.99 dm³
Convert 25 g CO2 to moles CO2
12 Mixture 1 contains sand and water
Mixture 2 contains salt and water
Which method of separation could be used to obtain each of the required products from each
mixture?
mixture 2
10 ottain sand
to obtam water
to obtain salt
to obtain water
crystalisation
distillation
filtration
fiftration
B
crystalisation
filtration
fitration
distillation
Ty tallation
Crystallisation
Answer:
B i tyink
Explanation:
brainlyest plssss
To obtain sand and water from mixture 1 , filtration process will be used.
To obtain salt from water in mixture 2 , crystallisation will be done.
What is physical treatment process?Physical wastewater treatment processes include use of racks, screens, clarifiers (sedimentation and flotation), and filtration. Chemical or biological reactions are important treatment processes, but not part of a physical treatment process.
It is given that the mixture contains
Mixture 1 contains sand and water
Mixture 2 contains salt and water
To obtain sand and water from mixture 1 , filtration process will be used.
To obtain salt from water in mixture 2 , crystallisation will be done.
To know more about Physical Treatment Process
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How much heat is absorbed by a 15.5 g piece of gold as it is heated from 4.5 °C to 177.4°C?
Answer:
A 15.75-g piece of iron absorbs 1086.75 joules of heat energy, and its temperature changes from 25°C to 175°C. What is the specific heat capacity of iron?
Explanation:
The amount of heat absorbed by the gold is 339.1 joules, which was calculated by the formula of specific heat capacity.
What is specific heat capacity?Specific heat capacity, often just called “specific heat”, is the amount of heat energy required to raise the temperature of one unit of mass of a substance by one degree Celsius (or one Kelvin).
To calculate the amount of heat absorbed by the gold, we can use the formula:
Q = m × c × ΔT
where:
Q = heat absorbed (in joules)
m = mass of the gold (in grams)
c = specific heat capacity of gold (in joules per gram per degree Celsius)
ΔT = change in temperature of the gold (in degrees Celsius)
The specific heat capacity of gold is 0.129 J/g°C.
Substituting the given values into the formula, we get:
Q = 15.5 g × 0.129 J/g°C × (177.4°C - 4.5°C)
Q = 15.5 g × 0.129 J/g°C × 172.9°C
Q = 339.1 J
Therefore, the amount of heat absorbed by the gold is 339.1 joules.
Learn more about specific heat capacity, here:
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Will reaction Fe(OH)2 + BaCl2 be going in water?
yes/no and explanation please
Answer:
yes it will react in water as the chem
You are given a stock solution of 500.0 mL of 1.00M magnesium chloride solution. Calculate the volume of the stock solution you would need to use to prepare 250.0 mL of 0.20 M solution.
Answer:
[tex]50\; \rm mL[/tex] of the stock solution would be required.
Explanation:
Assume that a solution of volume [tex]V[/tex] contains a solute with a concentration of [tex]c[/tex]. The quantity [tex]n[/tex] of that solute in this solution would be:
[tex]n = c \cdot V[/tex].
For the solution that needs to be prepared, [tex]c = 0.20\; \rm M = 0.20\; \rm mol \cdot L^{-1}[/tex]. The volume of this solution is [tex]V = 250.0\; \rm mL[/tex]. Calculate the quantity of the solute (magnesium chloride) in the required solution:
[tex]\begin{aligned}n &= c \cdot V \\ &= 0.20\; \rm mol \cdot L^{-1} \times 250.0\; \rm mL \\ &= 0.20\; \rm mol \cdot L^{-1} \times 0.2500\; \rm L \\ &= 0.050\; \rm mol\end{aligned}[/tex].
Rearrange the equation [tex]n = c \cdot V[/tex] to find an expression of volume [tex]V[/tex], given the concentration [tex]c[/tex] and quantity [tex]n[/tex] of the solute:
[tex]\displaystyle V= \frac{n}{c}[/tex].
Concentration of the solute in the stock solution: [tex]c(\text{stock}) = 1.00\; \rm M = 1.00\; \rm mol \cdot L^{-1}[/tex].
Quantity of the solute required: [tex]n = 0.050\; \rm mol[/tex].
Calculate the volume of the stock solution that would contain the required [tex]n = 0.050\; \rm mol[/tex] of the magnesium chloride solute:
[tex]\begin{aligned}& V(\text{stock}) \\ &= \frac{n}{c(\text{stock})} \\ &= \frac{0.050\; \rm mol}{1.00\; \rm mol \cdot L^{-1}} \\ &= 0.050\; \rm L \\ &= 50\; \rm mL\end{aligned}[/tex].
Which of the above molecules? how did you know?
1. Sodium Nitrate
2. Carbonic Acid
3. Methane
4. Ammonia
5. Table salt
6. Carbon Dioxide
7. Atmospheric oxygen
8. Hydrochloric Acid
9. Hydrogen peroxide
Answer:
I know Sodium Nitrate,Methane,Carbon Dioxide,Atmospheric Oxygen and Hydrochloric Acid
3. Look at the reaction below:
H2O + C —— CO+ H2
AH = +130kJ mol^-1
Explain what happens to the position of equilibrium if we:
a. increase the pressure
b. increase the concentration of hydrogen gas
c. increase the temperature
d. add a catalyst
Explanation:
a. pressure always favors the side with fewer molecules. in this reaction as both the sides have equal number of molecules, there won't be any change in the position of the equilibrium.
b. when the concentration of the hydrogen gas is increased. more particles would take place in the reaction and so, the rate of reaction would increase favoring the reaction concerning hydrogen gas molecules (backward reaction in this case) therefore, equilibrium would shift to the backward reaction (left).
c. as forward reaction is endothermic, when temperature is increased the equilibrium will shift to the forward reaction (right).
d. catalyst would not have any effect on the position of the equilibrium. it will only increase the rate of reaction.
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PLEASE HELP
If a mineral can scratch a penny, what number is it on Mohs Scale?
Explanation:
z o o o m 85675494491 pwd eu3nFG
32. Explain why carbon shows versatile nature why it forms so many organic compounds.
Answer:
Carbon is a versatile element and is found in many different chemical compounds, including those found in space. Carbon is versatile because it can form single, double, and triple bonds. It can also form chains, branched chains, and rings when connected to other carbon atoms.
Explanation:
meaning of versatile: capable of or adapted for many different uses, skills, etc. 2 variable or changeable.
The versatile nature of carbon can be best understood with its features such as, tetravalency and catenation. In this section let us learn more about versatility of carbon.
Carbon is a versatile element and is found in many different chemical compounds, including those found in space. Carbon is versatile because it can form single, double, and triple bonds. It can also form chains, branched chains, and rings when connected to other carbon atoms.
The two characteristic features seen in carbon, that is, tetravalency and catenation, put together give rise to a large number of compounds. Many have the same non-carbon atom or group of atoms attached to different carbon chains.
Catenation: The property of forming long chains by self-linking with other carbon atoms to form long chains, rings, double or triple bonds is called catenation.
Isomerism: Compounds with same molecular formula but different structural formula are called isomers. An isomerism commonly seen is due to difference in the arrangement of atoms or groups of atoms & is called structural isomerism. The 4 types of structural isomerism are:
Chain isomerism
Position
Functional
Metamerism
Tetravalency: Carbon has 4 electrons in its valence shell. Energy considerations do not allow it to gain or lose 4 electrons; therefore it forms covalent bonds with other elements to complete its octet. This accounts for its tetravalency and explains its ability to form a variety of compounds.
What is an energy conserved system ?
Answer: In physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time. For instance, chemical energy is converted to kinetic energy when a stick of dynamite explodes.
Explanation:
internet
5 characteristics of salt
Answer:
salty and
Crystals or white crystalline powder.
Transparent and colourless in crystalline form – rather like ice.
Crystallises in the isometric system, usually in the form of cubes.
Soluble in water (35.6g/100g at 0°C and 39.2g/100g at 100°).
Slightly soluble in alcohol, but insoluble in concentrated hydrochloric acid.
Explanation:
Answer:
sea salt, black salt I only know two of them
i need help i got these wrong on my first attempt
Meteorite: One the surface of Earth
Meteoroid: In outer space
Meteor: Entering Earths atmosphere
Explanation:
If you have a mixture of baking soda and water, what separation technique would you use?
Answer:
I believe you can evaporate the water.
Explanation:
If you evaporate the water, it leaves the baking soda particles.