Answer:
seven on the ph scale is the neutral point
Explanation:
The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.
4
25.0 mL of a 0.625 M solution are diluted to a total volume of 100 mL. What is
the molarity of the new solution? (Report your answer to three places past the
decimal point. Moodle is looking for a number only, no units.)
Answer:
.156 M
Explanation:
diluting 25 to 100 cuts the M to 1/4 of the original
1/4 * .625 = .15625
balanced equation for bromine and potassium iodide?
Answer:
Br2+KI→KBr+I2
Explanation:
What is the lowest energy level that contains d orbitals.
Answer:
3
Explanation
it is 3
lewis acids and bases are most closely with which process?
Answer:
Lewis acids and bases are most closely associated with ELECTRON TRANSFER. A Lewis acid is defined as as a chemical specie that can accept an electron pair from a Lewis base to form a Lewis adduct while a Lewis base is defined as a specie which can donate an electron pair to a Lewis acid or an acceptor compound. Thus, Lewis base and acid has to do with electrons transfer.
Explanation:
which of these changes are endothermic and which are exothermic
baking a cake
bending a plastic ruler
cutting paper
melting ice cream
ripening of fruit
souring of milk
Answer:
exothermic - bending a plastic ruler , cutting paper, melting ice cream, ripening of fruit, souring of milk.
Explanation:
endothermic- baking of cake .
Which of the following equations represents a nuclear charge?
A) H2O(s) + Heat --> H2O(I)
B) H2CO3(aq) --> H2O(I) + CO2(g)
C) 14 14 0
C --> N + e
6 7 -1
D) H2CO3(aq) + Ca(OH)2(aq) --> CaCO3(s) + 2 H2O(I)
Select one:
a. A
b. B
c. C
d. D
Which feature of a balanced chemical equation demonstrates the law of conservation of mass?
Answer:
A balanced equation demonstrates the conservation of mass by having the same number of each type of atom on both sides of the arrow.
Explain how the moon causes high and low tides.
Answer:
gravitational pull generates something called tidal force.
Explanation:
High and low tides are caused by the moon. the moons gravitational pull generates tidal force.
When a magnet spins within a coil of wires, what is produced?
A. blue sparks
B. glowing light
C. nuclear energy
D. an electric current
and
In an electric generator, ___ will increase the output of electricity.
A. decreasing the turns of wire
B. increasing the turns of wire
C. decreasing the size of the magnet
D. decreasing the speed if the spinning magnet
lastly
Electric field defined as force per charge. It is measured in units of newtons divided by _____.
A. watts
B. coulombs
C. mass
D. grams
thanks :)
A 10.0 ml portion of 0.010 m hcl is diluted by adding it to100.0 ml of water. what is the ph of the solution
From the calculation, the pH of the solution after dilution is 3.
What is the pH?The pH is the hydrogen ion concentration of the solution. Now we know that;
C1 = 0.010 m
V1 = 10.0 ml
V2 = 10.0 ml + 100.0 ml = 110 ml
C2 = ?
C1V1 = C2V2
C2 = C1V1 /V2
C2 = 0.010 m * 10.0 ml / 110 ml
C2 = 0.00091 M
pH = -log[0.00091 M]
pH = 3
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When the sun runs out of hydrogen in its core, it will become larger and more luminous because:.
Answer:
Faster hydrogen burning means the star will grow larger and more luminous to allow the extra energy created to escape
it starts fusing hydrogen in a shell around a helium core.
Why are reaction orders not always equal to the coefficients in a balanced chemical equation?
The reaction order is given as the relationship between the concentrations of the reactants and the rate of a reaction.
The order of a rate law is the sum of the exponents of the concentration of the reactants.The rate law of a reaction is used to understand the composition of the reaction mixture. Specifically, the reaction order is the exponent to which the concentration of that reactants are raised, and it indicates that how well the concentration of a reactants affects the rate of a reaction.There are number of methods used to determine the reaction order. Reaction orders not always equal to the coefficients in a balanced chemical equation , it only determined the number of molecules per mole present in a given reaction.Learn more about order of reaction here..
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What mass of sodium chloride (nacl) forms when 7.5 g of sodium carbonate (na2co3) reacts with a dilute solution of hydrochloric acid (hcl)? type in your answer using the correct number of significant figures. na2co3 2 hcl → 2nacl h2o co2 7.5 g na2co3 = g nacl
Answer:
8.3 g of NaCl
Explanation:
Edge 2022
Answer:
8.3 g NaCl
Explanation:
Its right just type it in
We know the sun is primarily made from hydrogen and helium on the basis of its:
We know the sun is primarily made from hydrogen and helium on the basis of its spectrum.
What is Sun's spectrum?Sun's spectrum refers to the light of the Sun whose wavelength spectra can be used to identify atomic composition.
Thus spectrum (Sun's spectrum) initiates with the red light (700 nm) and ends with the blue (380 nm).
In conclusion, we know the sun is primarily made from hydrogen and helium on the basis of its spectrum.
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The temperature
of a thermometer
increases during a chemical reaction.
What happens to the energy of the
reaction (system)?
Answer:
The reaction absorbs energy ( + or exothermic)
Explanation:
When the temperature of a thermometer increases during a chemical reaction, then the reaction absorbs energy (+ or endothermic). Therefore, the correct option is B.
A rise in the temperature of a thermometer during a chemical reaction is a sign that the system is absorbing energy. This implies that the reaction is endothermic, meaning that energy must be supplied for it to proceed. Generally, endothermic reactions take heat from the environment and raise the temperature. Chemical bonds are broken and the process is accelerated by the absorbed energy.
Therefore, the correct option is B.
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How many grams of oxygen are contained in a sample of H2O that also contains 3.85 moles of hydrogen atoms?
Answer:
30.8 g oxygen
Explanation:
There are 1/2 as many Oxygen moles as hydrogen moles in H2O
so there are 3.85 / 2 * 16 gm of oxygen = 30.8 gms oxygen
valance shell example..
Answer:
Oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell.Valence electrons are the electrons in the outermost shell, or energy level, of an atom. Configuration of oxygen's valence electrons as 2s²2p⁴.Explanation:
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what does ivf stand for and sexual intercom
Answer:IVF
Explanation:
is Zinc + Hydrogen Chloride a chem. change why or why not
Answer:
When zinc reacts with hydrochloric acid, the reaction bubbles vigorously as hydrogen gas is produced. The production of a gas is also an indication that a chemical reaction is occurring.
Explanation:
Hydrogen reacts with an element to form a compound. which element would have the most valence electrons available to react with hydrogen?
Answer:
the element is oxygen
Explanation:
it will react to give H2O
All of the following are anthropogenic greenhouse gases except Group of answer choices a. carbon dioxide. b. molecular oxygen. c. chlorofluorocarbons (CFCs). d. methane.
Answer:
c
Explanation:
its not a plant based gas
1.How many sodium ions are there in 78.6 g of sodium phosphate?
Answer:
two
Explanation:
Take a small amount of water and milk in two different but similar container's. Freze them by putting them in a refrigerator .NOw melt them,in the sunshine,boil them on the same stove under the same condition ,and evaporate them completely .note there time during changing of their states .what similarities and differences you find while changing the states of noth of the materials
All liquids evaporate if exposed to certain elements.
What is Evaporation ?Evaporation is the process by which water changes from a liquid to a gas or vapor.
Evaporation is the primary pathway that water moves from the liquid state back into the water cycle as atmospheric water vapor.
All liquids evaporate if exposed to certain elements.
The rate at which a liquid evaporates depends on its molecular structure.
The other factors that affect evaporation are surface area, temperature and air movement.
We can also do a few fairly simple experiments to demonstrate the effect that the various factors have on the rate of evaporation.
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Part 1. A chemist reacted 15.0 liters of F2 gas with NaCl in the laboratory to form Cl2 and NaF. Use the ideal gas law equation to determine the mass of NaCl that reacted with F2 at 280. K and 1.50 atm.
F2 + 2NaCl → Cl2 + 2NaF
Part 2. Explain how you would determine the mass of sodium chloride that can react with the same volume of fluorine gas at STP.
explain please (for 40 pts)
Answer:
113 g NaCl
Explanation:
The Ideal Gas Law equation is:
PV = nRT
In this equation,
> P = pressure (atm)
> V = volume (L)
> n = number of moles
> R = 8.314 (constant)
> T = temperature (K)
The given values all have to due with the conditions fo F₂. You have been given values for all of the variables but moles F₂. Therefore, to find moles F₂, plug each of the values into the Ideal Gas Law equation and simplify.
(1.50 atm)(15.0 L) = n(8.314)(280. K)
2250 = n(2327.92)
0.967 moles F₂ = n
Using the Ideal Gas Law, we determined that the moles of F₂ is 0.967 moles. Now, to find the mass of NaCl that can react with F₂, you need to (1) convert moles F₂ to moles NaCl (via the mole-to-mole ratio using the reaction coefficients) and then (2) convert moles NaCl to grams NaCl (via molar mass from periodic table). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units (the desired unit should be in the numerator).
1 F₂ + 2 NaCl ---> Cl₂ + 2NaF
Molar Mass (NaCl): 22.99 g/mol + 35.45 g/mol
Molar Mass (NaCl): 58.44 g/mol
0.967 moles F₂ 2 moles NaCl 58.44 g
---------------------- x ----------------------- x ----------------------- = 113 g NaCl
1 mole F₂ 1 mole NaCl
Describe the reasoning behind using phosphorus and boron in conjunction
with one another.
defective greatest formerly knows sd ghost;
Consider the reaction below.
C₂H4(g) + H₂(g) → C₂H6(g)
Answer:
I don't see a question.
Explanation:
I do see a reaction in which tells us that the C2H4 has a double-bonded C. The additrtion of H2 breaks this bond and provides the two bonding sites needed for the 2 new hydrogen atoms.
H2C=CH2 + H2 → H3C-CH3
S + 6 HNO3 → H₂SO4 + 6 NO₂ + 2 H₂O
-
In the above equation, how many grams of water can be made when 5.8 moles of HNO3 are consumed?
Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer
as 4.0
Use the following molar masses. If you do not use these masses, the computer will mark your
answer incorrect.:
Element
Molar
Mass
Hydrogen 1
Nitrogen 14
Sulfur
32
Oxygen 16
35 g (Rounded to the nearest tenth) H₂O can be made when 5.8 moles of HNO₃ are consumed.
What is Mole ratio ?Mole Ratio is a conversion factor between compounds in a chemical reaction, that is derived from the coefficients of the compounds in a balanced equation.
The mole ratio is therefore used to convert between quantities of compounds in a chemical reaction.
The mole ratio of HNO₃ and H₂O is 6 : 2
Hence, 16.9 moles of HNO₃ will produce = 2/6 × 5.8 = 1.93 moles of H₂O
Also,
Mass = Moles × M.Mass
Mass = 1.93 mol × 18.02 g/mol
Mass = 34.83 g H₂O
= 35 g (Rounded to the nearest tenth)
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Cyclohexene oxidation with potassium permanganate gives three different products, depending on conditions. what product (one) could not be obtained
Answer:
will you help us with that one please
Practice question 1 How many moles are in 5.64e25 atoms of iron (Fe)?
1 mole is equal to 6.0220 x 1023 atoms of any element.
Match the zone to its characteristics.
Horse latitudes
Subpolar low
Doldrums
?
?
?
Heavy precipitation, little
wind
The trade winds and
westerlies originate here
Lies along the polar jet
stream
The zone and its characteristics include the following:
Subpolar low: Lies along the polar jetstream.Horse latitudes: The trade winds and westerlies originate here.Doldrums: Heavy precipitation, little wind.What is Horse latitude zone?This is referred to regions which is located at about 30 degrees north and south of the equator and forms the basis of westerlies.
The other zones such as doldrums are also found at the equator with their respective features and can be seen above. This therefore makes it the most appropriate choice.
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