Answer:
the one with the lower ionization energy is more likely to be positive as it is easier to remove the valence electron that causes the positive charge
element a is likely in the s block as that is a low ionization energy and they get larger as you move up and to the R in the table
and element b is likely in the p block for the same reason
Explanation:
To prepare 800mL of 1M phosphate buffer of pH 7.2 (PKa=7.1), by using salt = K2HPO4 and acid = KH2PO4, the quantity of salt required is
Answer:
78.04g of 0.448 moles must be added
Explanation:
Using H-H equation we can find the pH of the buffer:
pH = pKa + log [A⁻] / [HA]
Where pH is the pH of the buffer = 7.2
pKa = 7.1
[A⁻] = [K₂HPO₄]
[HA] = [KH₂PO₄]
Replacing:
7.2 = 7.1 + log [K₂HPO₄] / [KH₂PO₄]
0.1 = log [K₂HPO₄] / [KH₂PO₄]
1.2589 = [K₂HPO₄] / [KH₂PO₄] (1)
And as the concentration of the buffer is:
1M = [K₂HPO₄] + [KH₂PO₄] (2)
Replacing (2) in (1):
1.2589 = 1M - [KH₂PO₄] / [KH₂PO₄]
1.2589 [KH₂PO₄] = 1M - [KH₂PO₄]
2.2589 [KH₂PO₄] = 1M
[KH₂PO₄] = 0.44M
And [K₂HPO₄] = 0.56M
In 800mL = 0.8L:
0.8L * (0.56mol / L) = 0.448 moles K₂HPO₄. The mass is -Molar mass K₂HPO₄: 174.2g/mol-:
0.448 moles * (174.2g / mol) =
78.04g of 0.448 moles must be addedWhich layer over time due to chemical and physical weathering leads to the other layers?
Answer:
chemical weathering occurs on the surface of minerals, the water and acids that control chemical weathering require access to the surface. Physical weathering breaks the rock to provide that surface
How many grams of Sn will be created when 114 grams of SnO2 react with excess H2? SnO2 + H2 ->Sn + H2O
I
Explanation:
CNN vfbtgnynynynynyuybunujy
What is the number of moles of 60.7 liters of oxygen molecules?
Answer:
2.17 moles of gas.
Explanation:
PLEASE HELP ASAP I'LL MARK BRAINLIEST
Thank you :)
8. A meteor moving 468 km per minute traveling in a south-to-north direction passed near Earth in 2013.
Does this statement describe the meteor’s speed or velocity? 1pt
9. Why did you choose the answer above (explain why)? 1pt
Answer:
Its velocity was 7.8 km/s northward.
Explanation:
Because the meteor was only 45 m wide and was 27,700 km above Earth's surface it was not visible with the aid of a telescope.
How to convert 1348celsius to kelvin in stoichiometry reaction of a gas. The gas turned white not green.
Answer:
1621 K
Explanation:
How to convert 1348 celsius to kelvin
Celsius and Kelvin are both units for temperature. The relationship between both units is given as;
Kelvin (K) = Celsius ( °C ) + 273
Inserting the values from the question;
Kelvin (K) = 1348 + 273 = 1621 K
Explain why the elements in group 7 have 7
valence electrons.
Answer:
The periodic table was made that way by the scientists who created it
Explanation:
to make things easier for the users.
In the cycle, after a new moon, _______________ means light appears on the _____________ side of the moon and continues to ________________.
Answer:
Explanation:
In the cycle, after a new moon, waxing means light appears on the right side of the moon and continues to increase.
How can a compound not conduct electricity as solid but do so when liquid?
HELP
Explanation:
Ionic compounds conduct electricity when molten (liquid) or in aqueous solution (dissolved in water), because their ionsare free to move from place to place. Ionic compoundscannot conduct electricity when solid, as their ions are held in fixed positions and cannot move.
Why do surface waves break along the shore?
Answer:
because the global sea level rises while the poles temperature increases
Explanation:
Which statement best explains a way in which a cell gets rid of wastes?
Answer:
I would say B but you don't have to take my word for it
Answer:
D
Explanation:
For each of the following unbalanced equations indicate how many moles of the second reactant would be required to react exalt with 0.275 mole of the first reactant. Balance the equation.Co(s) + P4 (s) Co3P2 (s)
Answer:
0.183 mol
Explanation:
so balenced equation is 6Co+4P=2(Co3P2)
so so the ratio is 6:4
so .275/6*4
=0.183 mol I think
The Answer will be: 0.183 mol
so that the balanced equation is 6Co+4P=2(Co3P2) When the ratio is 6:4so that .275/6*4
=0.183 mol.
When According to the A balanced chemical is equation has been equal numbers of atoms that are for each element they are involved in the reaction and its represented on the reactant and its product sides.Also that This is a better requirement that makes the equation must be satisfied and also that to be consistent with the law of conservation of the matter. then It may occur that it is confirmed by simply summing the numbers of atoms and also molecules on it either side of the arrow and it's comparing these sums to ensure that they are equal.( 1 CO 2 molecule × 2 O atoms CO 2 molecule) + ( 2 H 2 O molecule × 1 O atom H 2 Molecule ) = 4 O atoms
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Which of the 3 molecules: Methane, Propane, Butane would release the most energy when combusted?
Answer:
butane
Explanation:
How much energy is needed to heat 9.3 grams of silver metal from 21 °C to 52 °C, if the
specific heat of silver metal is 0.240 J/g °C?
Question 5
4 pts
How much heat must be added if 160 grams of water is heated from 24 °C to 85 °C?
(The specific heat of water is 4.184 J/g °C)
Look at picture
ASAP please will mark as brainlist don’t got much time
Answer:
question 4. 69.19J
question 5. 40835.84J
Explanation:
question4.
heat needed = mass × specific heat capacity × change in temperature
= 9.3× 0.240×(52-21)
=69.192J
question 5.
heat added = 160× 4.184×(85-24)
= 40835.84J
What do atoms consist of?
Answer:
protons, neutrons, electrons
Answer:
Atoms consist of 3 particals:Protons,Neutrons,and Electrons
1)Water takes this form above 100c (solid, liquid or gas)
2) Water takes this form below 0c (solid, liquid, or gas)
3) Water takes this star between 0 and 100c (solid, liquid, or gas)
4) Water changes to this state above 100c (solid, liquid, or gas)
Science wasn’t a subject so I chose chemistry but this is for my science class
Answer:
I say the 1st one I'm so terrible sorry if I'm wrong
Explanation:
Water can take many forms. At low temperatures (below 0°C), it is a solid. When at “normal” temperatures (between 0°C and 100°C), it is a liquid. While at temperatures above 100°C, water is a gas (steam).
The state the water is in depends upon the temperature. Each state (solid, liquid, and gas) has its own unique set of physical properties.
what type of bond holds different water molecules together
I WILL GIVE BRAINLIST!!!!!!!!!!!!!!!!!!!!!! PLZZZZZZZZZ HELPPPPPPPPPPPPPP
Explain how proper motion will affect the constellation as seen from the earth.
Water can exist in all three states of matter.
Describe the arrangement and movement of particles in each of the three states of matter. Explain what happens to the particles in a liquid during boiling.
I'll give someone brainly and thanks if they answered the question correctly. 30 points!!
Answer:
The particles in a liquid move very quickly due to heat while it is boiling and gradually turns to gas
What is one energy transformation that is taking place in the photo?
radiant energy to thermal energy
thermal energy to nuclear energy
chemical energy to thermal energy
radiant energy to chemical energy
Answer:
Radiant energy to chemical energy
Explanation:
Got it right on edge 2021
One energy transformation that is taking place in the photosynthesis process is radiant energy to chemical energy.
What is energy transformation?Energy transformation is the process in which one form of energy converted into another form of energy.
What is photosynthesis process?Photosynthesis process is defined as the process in which plants makes their own food by using the carbon dioxide, water and sunlight in the chlorophyll.
The balanced chemical equation of photosynthesis process is
6CO2 + 6H2O → C6H12O6 + 6O2.
Since, it have 6 atoms of carbon, 12 atoms of hydrogen and 18 atoms of oxygen on both side. So, it is balanced.
Since, sunlight which it take is in the form of radiant and convert it into chemical energy.
Thus, we concluded that the energy transformation that is taking place in the photosynthesis process is radiant energy to chemical energy.
learn more about photosynthesis process:
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I NEED A WORK EQUATION AGAIN HELLPPP PPLS!!!
Answer:
calcium+ethanoic acid= carbon dioxide + water
Zinc + ethanoic acid= zinc ethanoate+water
Answer:
calcium + ethanoic acid → calcium ethanoate + water
zinc + ethanoic acid → zinc ethanoate + water
How many grams of gasoline were
burned if 1.63 x 1023 molecules of
water were produced? Only report
number (no units) and use correct sig
figs.
Answer:
31.0 g C8H18
Explanation:
Gasoline is equivalent to C8H18
to convert molecule to gram you have to convert molecules to mols first.
Using Avocado's number we can figure that out.
(1.63 x 10²³ molecules C8H18) (1 mol C8H18/ 6.022 x 10²³) = 0.271 mols C8H18
Then we convert mols to grams using the molar mass of C8H18
C - 8(12.011) = 96.088 g/mol
H - 18(1.008) = 18.144 g/mol
add that together: 114.232 g/mol
(0.271 mol C8H18) (114.232 g/ 1 mol C8H18) = 31.0 g
31.0 g C8H18
P.S: SORRY IF THIS DOESNT HELP!! I dont know if they are talking about the actual formula for gasoline.
Why does lowering the pressure cause a liquid to boil?
A. It becomes easier for molecules to escape.
B. It pushes molecules out of the liquid.
C. It causes the temperature to rise.
D. It changes the volume of the liquid.
Lowering the pressure in a container will cause the liquid in the container to boil faster because it becomes easier for the molecules to escape.
What causes boiling?Boiling happens when the vapor pressure of a liquid equals the atmospheric pressure.
By lowering the atmospheric pressure, the vapor pressure of a liquid takes a lower time to equal the atmospheric pressure.
Thus, it becomes easier for the molecules of the liquid to escape from each other.
More on boiling and pressure can be found here: https://brainly.com/question/2510654
Help please I am so lost my teacher is no help
Answer:
B - CALCIUM
Explanation:
Hopes it helps
Lightning storms trigger wildfires that burn up a lot of the plants and grasses in the ecosystem. Trees are mostly spared. what is the cause of this
Answer:
B
Explanation:
:)
PLEASE ANSWER URGENT Write the electron configurations for the following three atoms.
1. Nitrogen
2. Chlorine
3. potassium
Answer:
[He] 2s2 2p3
[Ne] 3s² 3p⁵
[Ar] 4s¹
Which of the following is not a part of the digestive system
A. Mouth
B.Esophagus
C.Intestines
D.Kidneys
Answer:
Kidneys •_•
Hope this helped <3
Given the reaction: 2 H2 + O2 => O2 = 2 H2O.
What is the total mass of water formed when 497.80 g of oxygen reacts with hydrogen?
How many atoms of tin are found in 3.50 moles of tin?
Answer:
2.11x10²⁴ atoms
How do you know when a redox equation is balanced?