Answer:
25%
Explanation:
I assume you menat 20 cm^3 of water
5 gm / 20 gm = 25 %
Which statement best describes how potassium bonds with bromine?
Potassium will donate an electron to bromine.
Bromine will donate an electron to potassium.
Bromine will donate seven electrons to potassium.
Potassium will share seven electrons with bromine.
Answer:
Potassium will donate an electron to bromine.
Explanation:
When potassium and bromine come together, the more electronegative bromine will snatch that solitary valence electron from the potassium atom. This will lead to the formation of the potassium cation, K+ , and the bromide anion, Br− .
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I need a mnemonic for the reactivity server of metals please
Potassium
Sodium
Lithium
Calcium
Magnesium
Aluminium
Carbon
Zinc
Iron
Nickel
Tin
Lead
Hydrogen
Copper
Mercury
Silver
Gold
Platinum
Explanation:
Lithium Sodium Potassium group 1
Hydrogen proton +1
Iron Fe2+
A mixture of heptane (bp 98oC) and 1-propanol (bp 97oC) is not fully resolved using SE-30 as the stationary phase, but is easily separated using a column of DEGS. Explain with your own words.
A mixture of heptane and 1-propanol easily dissolved using DEGS because diethylene glycol sussinate (C8H14O6) 1 propanol easily dilutes and retain surface.
What is mixture?Generally, a mixture speaks to the joining of two different substance in other to achieve a different substance or something combining or becoming matched.
In conclusion, SE-30 is neutral in nature, DEGs is a stationary phase containing a non-volatile liquid phase. It also includes polar group OH types,
Hence, using Hydrogen bonding it can easily bind 1-propanol.
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Calculate the poh of this solution. round to the nearest hundredth. ph = 1.90 poh =
Answer:
10.25
Explanation:
There I proved it
Answer:
pOH = 12.10
Explanation:
pOH = 14 - pH = 14 - 1.90 = 12.10
A buffer solution must contain: Select one: a relatively high amount of both an acid and its conjugate base dissolved in water a relatively high amount of the conjugate base dissolved in water a solution that is at pH 7 a relatively high amount of a weak acid dissolved in water a solution that does not contain water
A buffer solution must contain relatively high amount of both an acid and its conjugate base dissolved in water.
What is a Buffer Solution?A buffer solutrion is a soltion that contains appreciable amounts of a
A mixture of a weak acid and its conjugate base A mixture of a weak base and its conjugate acidweak conjugate acid-base pairBuffer solutions resist any small change in pH when small amounts of a strong acid or a strong base are added
Examples of a buffer solution is
The solution of acetic acid and sodium acetate (CH3COOH + CH3COONa),this contains a weak acid and its salt.The solution of ammonia and ammonium chloride (NH3(aq) + NH4Cl(aq), This contains a weak base and its salt.Learn more here on Buffer solution:https://brainly.com/question/10643807
How many moles are contained in 39 L of F2 gas at STP?
The number of moles contained in 39 L of F2 gas at STP is 1.74mol. Details on how to calculate number of moles can be found below.
How to calculate number of moles?The number of moles of a gas at STP can be calculated using the following formula:
PV = nRT
Where;
P = pressureV = volume n = number of moles R = gas law constantT = temperatureAt STP, the following applies:
T = 273KP = 1 atmR = 0.0821 Latm/molK1 × 39 = n × 0.0821 × 273
39 = 22.41n
n = 1.74mol
Therefore, the number of moles contained in 39 L of F2 gas at STP is 1.74mol.
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How does tension affect the speed of a wave in a rope
How are fluids used and controlled in manufactured devices?
Answer:
Fluid power systems perform work by a pressurized fluid bearing directly on a piston in a cylinder or in a fluid motor. A fluid cylinder produces a force resulting in linear motion, whereas a fluid motor produces torque resulting in rotary motion. Within a fluid power system, cylinders and motors (also called actuators) do the desired work. Control components such as valves regulate the system.
Which scientist first applied DNA Analysis techniques to crime scene evidence?
a)Tommy Lee Andrews
b)Colin Pitchfork
c)Stephen Jones
d)Alec Jeffreys
What is the brown liquid for that the grasshopper may “spit” out?
Answer:
It is called "tobacco juice"
Explanation:
When a grasshopper is picked up they spit the brownish liquid known as "tobacco juice." They use it as some sort of defense mechanism to protect them from attacks by predators.
Hope this helps:)...if not then sorry for wasting your time and may God bless you:)
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What is the power output of the stickman that pushes the box 5 meters in 3 seconds with a constant force of
12 N?
Answer:
20W
Explanation:
the power of qn object doing work w in a given time t is given by
p= w/t
Giving brainiest and 55 points!
Answer:
C
Explanation:
Hot and humid weather, accompanied by thunderstorms, is generally due to maritime tropical air massoriginate in the tropical oceans of both the hemispherescharacterized by high temperatures and are rich in moisture contentair mass during winter moves towards the land areas in the form of wind breeze affecting placesexperiences hot and humid weather during the summer seasonA liquid has an empirical formula CCl2, and a boiling point of 1 21 oC. When vapourised, the gaseous compound has a density of 4.93 g/L at 785torr and 1 50oC. What is the molar mass of the compound and what is its molecular weight?
Based on the data given, the molar mass of the gas is 165.5 g/mol while the molecular weight of the gas is 165.5 amu
How can molar mass of a gas be obtained from density, temperature and pressure?The molar mass of a gas can be obtained from density, temperature and pressure using the formula below:
molar mass = density × molar gas constant × temperature/pressureMolar gas constant, R = R = 0.082 L.atm/mol/K.
Temperature = 150 °C = 423 K
Pressure = 785 torr = 1.033 atm
density = 4.93 g/L
molar mass of gas = 4.93 × 0.082 × 423/1.033
molar mass of gas = 165.5 g/mol
Then, molecular weight of the gas = 165.5 amu
Therefore, the molar mass of the gas is 165.5 g/mol while the molecular weight of the gas is 165.5 amu
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What is the 2nd step in the process of natural selection?
Answer: Selection proper
Explanation:
it's an anti-chance process, but subject to many constraints
how wind can affect the cooling of the air parcels
Answer:
Wind pushes air parcels even higher in the troposphere, where it is colder. The air parcels will then lose more energy and more rain can happen.
Explanation:
Answer:
Wind propels air packages upward into the troposphere, which is cooler. As a result, the air packets will lose more energy and more rain may fall.
Explanation:
The modern day three little pigs will need to choose from the following materials to build their energy efficient home: Vibranium, Beskar, and Gundarium
order for the three little pigs to be successful in building an insulated home that loses as little heat as possible, they will need to choose the materal with ta
highest specific heat, Cp-
Vibranium
Choosing the material with the highest specific heat capacity is ideal and true.
What is Specific heat capacity?This is defined as the quantity of heat needed to raise the temperature per unit mass.
Insulators have a higher specific heat capacity as it takes more time for them to absorb heat thereby making it ideal in building an insulated home.
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how is a convection current created.
Answer:
it is created by movement of molecules with higher energy upwards and the movement of molecules with lower energy downwards
Explanation:
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Propane gas, C3H8, burns in excess oxygen gas. When the equation for this reaction is correctly balanced and all coefficients are reduced to their lowest whole-number terms, the coefficient for O2 is
(A) 4 (B) 5 (C) 7 (D) 10 (E) 22
Answer:
5
Explanation:
First find the balanced equation for this rxn
C3H8 + 5O2 ====> 3 CO2 + 4 H2O
To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. The correct option is option A.
What is Balanced equation?Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, displacement reaction.
Propane gas, C[tex]_3[/tex]H[tex]_8[/tex], burns in excess oxygen gas. When the equation for this reaction is correctly balanced and all coefficients are reduced to their lowest whole-number terms, the coefficient for O[tex]_2[/tex] is 5.
C[tex]_3[/tex]H[tex]_8[/tex] + 5O[tex]_2[/tex] [tex]\rightarrow[/tex] 3 CO[tex]_2[/tex] + 4 H[tex]_2[/tex]O
Therefore, the correct option is option B.
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a
Scientists have observed that the average surface temperature of the Earth has been increasing. This increase has
affected the oceans. Glaciers and ice sheets melt, and water from this melting process becomes part of the oceans.
The increasing temperature of the Earth's surface also warms ocean waters. As a result, the volume of the oceans
expands. These two events affect sea level.
What would happen to sea level if the average surface temperature trend that was observed since the 1960s
continues?
A) Sea level will rise, then will suddenly fall.
B) Sea level will remain the same.
C) Sea level will continue to fall.
D) Sea level will continue to rise.
Please select the best answer from the choices provided
O A
OB
Save and Exit
Next
Submit
Mark this and return
Answer:
D) Sea level will continue to rise
How many moles in 16 grams of oxygen?
Answer:
Half mole or 0.5 moles
__________________________________________________________
SolveOxygen has a molar molar mass of 32 g.
This means that O2 will have half that amount of grams, half-mole-substance.
6.022*10^23 molecules are present in one mole of any substance, so half it for O2.
6.022 × 10²³ [tex]-- >[/tex] 3.011 × 10²³
And simplified, that would make your answer 0.5 moles.
________________________________________________________
Questions?Ask in the comments box, please.
what the symbol of sodium peroxide
Answer:
The Symbol Of Sodium Peroxide Is Na2O2
Answer:
Na2O2
Explanation:
Riley took a train ride to Florida for vacation. It
took 67 hours to travel a distance of 1,546
kilometers. What was the speed of the train?
Answer: 23
I hope this helps! Have a good day! :)
In 1-2 sentences, describe what happens to atoms of a compound when a chemical reaction occurs
In a chemical reaction, bonds between atoms in the reactants are broken and the atoms rearrange and form new bonds to make the products.
The atoms get rearranged into new substances.
Can anyone help me please
Explanation:
The Animal meat contains Vitamins, proteins and carbohydrates and many more,
The other food group includes various minerals, (like copper, Calcium, Sodium, Phosphorus, selenium, cobalt, iron, zinc etc) various Amino acids, Fatty acids, water and albumin
The sources of vitamin like B12 are animals, and vegetarian should consume plant based supplements to fulfill the need of essential macromolecules!
[Side note: Meat consumption is secondary cause of increasing global warming Go vegan!]
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The balanced equation for the aerobic reaction is:
Zn + 2 HCl → ZnCl2 + H2
How much hydrogen gas is produced from 5 g of HCl?
Answer:
1.85 g of hydrogen gas will form!
Explanation:
1. Write the balanced equation.
Zn
+
2HCl
→
ZnCl
2
+
H
2
2. Calculate the moles of
Zn
.
Moles of Zn
=
30.0
g Zn
×
1 mol Zn
65.38
g Zn
=
0.4589 mol Zn
3. Calculate the moles of
H
2
.
Moles of H
2
=
0.4589
mol Zn
×
2 mol H
2
1
mol Zn
=
0.9177 mol H
2
4. Calculate the mass of
H
2
.
Mass of H
2
=
0.9177
mol H
2
×
2.016 g H
2
1
mol H
2
=
1.85 g H
2
How many chromosomes do humans without chromosomal abnormalities have?
a)46
b)16
c)23
d)92
Answer:
A. 46
Explanation:
Human cells normally contain 23 pairs of chromosomes, for a total of 46 chromosomes in each cell .
What happens to climate and weather over a summer?
Answer:
summers get hotter, and it can get more sticky or humid sometimes.
Explanation:
think of the seasons and the tempatures.
write any two conditions due to which demagnetization occur
Answer:
1) because of heating
2) because of hammering
which phrase explains the apparent motions of planets in the night sky?
The east to west daily motions of stars, planets, the Moon, and the Sun are caused by the rotation of the Earth on its axis. The Earth and all the planets revolve around the Sun on circular orbits. This produces the change in constellations observed from one time of year to the next.
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