Answer:
The balloon is cooled at a constant pressure until the temperature is -11°C. What is the volume of the balloon at this stage?
In the area with a large population of valuable ocean organisms is called a(n)
Answer:
fishery
An area with a large population of valuable ocean organisms is called a fishery. If it was correct mark me as brainiest
If the atomic number of chlorine is 17 and the atomic mass is 35.5 amu, then the molar mass of chlorine is?
Answer:
If the percentage abundance of Cl-35 is x , then x×35+(100−x)37100=35.5
75% of Cl-35 and 25% of Cl-37.I hope this helped!
Explanation:
what is the molarity of a solution of sodium hydroxide if it 15.0 mL requires 25.0 ml of 0.25M HCl to reach the end point
Answer:
0.42 M
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
HCl + NaOH —> NaCl + H₂O
From the balanced equation above,
The mole ratio of acid, HCl (nₐ) = 1
The mole ratio of base, NaOH (n₆) = 1
Finally, we shall determine the molarity of the base, NaOH. This can be obtained as follow:
Volume of acid, HCl (Vₐ) = 25 mL
Molarity of acid, HCl (Mₐ) = 0.25 M
Volume of base, NaOH (V₆) = 15 mL
Molarity of base, NaOH (M₆) =?
MₐVₐ / M₆V₆ = nₐ/n₆
0.25 × 25 / M₆ × 15 = 1
6.25 / M₆ × 15 = 1
Cross multiply
6.25 = M₆ × 15
Divide both side by 15
M₆ = 6.25 / 15
M₆ = 0.42 M
Therefore, the molarity of the base, NaOH is 0.42 M
Select the statement that is FLASE about this experiment. Group of answer choices Changing metal solution will affect the redox potential. To ensure consistent data, collect the redox potential values at least three times. Changing temperature will affect the redox potential. To ensure stable reading, insert the conductivity meter in the solution for at least 60 seconds. Changing concentration will affect the redox potential.
Well arranged question is;
Select the statement that is FALSE about this experiment. Group of answer choices;
A) Changing metal solution will affect the redox potential.
B) To ensure consistent data, collect the redox potential values at least three times.
C) Changing temperature will affect the redox potential.
D) To ensure stable reading, insert the conductivity meter in the solution for at least 60 seconds.
E) Changing concentration will affect the redox potential.
Answer:
D) To ensure stable reading, insert the conductivity meter in the solution for at least 60 seconds.
Explanation:
Usually, redox potential is the measure of the ability of chemical elements to gain/lose electrons from/to an electrode respectively and after which they undergo reduction or oxidation respectively.
From online sources on experiments to determine redox potential, and taking into account the nernst equation which is; E_cell = E_0 – (RT/nF)•ln Q
Where;
E_cell is cell potential
E_0 is potential of the cell under standard conditions
R is universal gas constant
T is temperature
n is the number of electrons that are transferred in the redox reaction
F is Faraday's constant
Q is reaction quotient
Now, with all that in mind and looking at the options, the one that is false is option D.
Write in exponential form: 34⋅34⋅34⋅34⋅34⋅34⋅34⋅34.
Answer:
34^8
Explanation:
Why do scientist conduct experiments on animals?
Answer:
Animals are used in scientific research to help us understand our own bodies and how they work. This is necessary to develop new medicines. Animals are also used to safety test potential medicines before they are tested in people and to check the safety of other chemicals.
Explanation:
3
Humans use energy from several different sources.
What evidence from the passage supports this statement?
dying
use
Iuch of
6. These
ecess, as
you.
A People use energy to play, study, eat, make basketballs,
and generate electricity
B People use energy from natural gas of coal the sun
wind and water
Wind turbines can affect bis bars and other wilde
derstand
Which element is in the same group as Al (aluminum)?
O A. B (boron)
O B. Si (silicon)
O C. Zn (zinc)
O D. Mg (magnesium)
Estimate the salt-to-water mass ratio that would produce the necessary change in temperature (i.e., 22-25°C.) Use the mass of salt calculated in the previous question and the water-to-salt ratio to determine the volume of water needed.
Answer:
Sea water salinity is expressed as a ratio of salt (in grams) to liter of water. In sea water there is typically close to 35 grams of dissolved salts in each liter. It is written as 35‰. The normal range of ocean salinity ranges between 33-37 grams per liter (33‰ - 37‰).
The chemical reaction between water and magnesium is?
Answer: hydrogen gas
Explanation: When magnesium interacts with water, it will form a hydrogen gas that ignites violently due to the excessive heat and oxygen supply.
State the number of neutrons in an atom of Ne-20 and the number of neutrons in an atom of Ne-22. choose two answers * 1 point Ne 20: 10 Ne 20: 11 Ne 22: 12 Ne 22: 13
Answer:
Ne 20: 10
and
Ne 22: 12
Explanation:
Ne-20:
N = A - Z = 20 - 10 = 10 neutrons
Ne-22:
N = A - Z = 22 - 10 = 12 neutrons
N: number of neutrons
A: mass number
Z: atomic number
Bubbles and fizzing can be seen instantly when baking soda is mixed with vinegar. The bubbles are evidence of which of the following?
A gas is formed when baking soda and vinegar are mixed.
Baking soda dissolves in vinegar when they are mixed.
Vinegar turns into alcohol when it is mixed with baking soda.
A precipitate is formed when baking soda and vinegar are mixed.
What has more kinetic energy? 120 180, 105
Answer:
If those values are in terms of mass, weight or velocity
Kinetic energy will be in the order 180 » 120 » 105
Answer:
105, if you're dealing with the weight of object
Explanation:
It's the amount of speed/movement an object can move. The lighter the weight the more amount of speed it has.
Hope this helps!
1. Watch how the solubility of a gas changes as pressure is increased and then decreased during the run. Which of the following statements correctly explain the relationship between the solubility of a gas and its pressure?
A. As pressure decreases, the concentration of gas molecules in the solution increases.
B. The concentration of gas particles in the solution is higher at 4.25 atm than at 1.00 atm.
C. The solubility of a gas decreases with a decrease in pressure.
D. The solubility of nitrogen gas at 2.00 atm is twice the solubility of the gas at 1.00 atm.
E. Fewer gas molecules are soluble at higher pressures.
F. More gas molecules are soluble as pressure is increased.
G. As pressure is increased, the rate at which gas molecules enter the solution decreases.
2. At a certain temperature, the solubility of N2 gas in water at 3.08 atm is72.5mg of N2 gas/100 g water. Calculate the solubility of N2 gas in water, at the same temperature, if the partial pressure of N2 gas over the solution is increased from 3.08 atm to 8.00 atm .
Answer:
A. As pressure decreases, the concentration of gas molecules in the solution increases.
D. The solubility of nitrogen gas at 2.00 atm is twice the solubility of the gas at 1.00 atm.
F. More gas molecules are soluble as pressure is increased.
The solubility is 188.3 mg of N2 gas/100 g water.
Explanation:
As the pressure on the gas decreases, the volume of gas molecules in the solution increases due to having distance from each other. The solubility of nitrogen gas at 2.00 atm is twice the solubility of the gas at 1.00 atm because there is more pressure on the gas molecules so due to more compression, the gas becomes more soluble. More gas molecules are soluble as pressure is increased. The solubility is 188.3 mg of N2 gas/100 g water if the atmospheric pressure is increases from 3.08 atm to 8.00 atm. This value is calculated with the help of formula i.e. P2/P1 = S2/S1.
Can anyone just give me the answers?
Answer:
i answered you
Explanation:
Which of the following is true?
The imaginary one subscript does not have a Greek prefix
The name of C6 H10 F6 is hexacarbide decahydrogen hexafluorine.
The name for the N2 molecule would have no Greek prefixes in it.
To name a covalent molecule you always change the ending on the metal atom.
Answer:
The name for the N2 molecule would have no Greek prefixes in it.
Explanation:
Prefixes and suffixes are used to name compounds that have many component parts.
The molecule N2 is just a simple molecule that consists of only two atoms of nitrogen. It is a diatomic molecule hence there are no Greek prefixes in the name of the molecule.
The molecule is simply identified as nitrogen gas.
When sodium chloride is dissolved in water, the freezing point of water _________. A. increases B. first increases, then decreases C. does not change D. decreases
The presence of a non-volatile salt will decrease the freezing point of water and this process is called depression in freezing point. Thus option D is correct.
What is freezing point?Freezing point of a substance is the temperature at which it converts from its liquid state to solid state where, both the states are in equilibrium. Freezing point of water is zero degree celsius.
The freezing point of a solvent depends on some parameters such as the bond type, molecular weight, temperature, pressure etc.
When a non-volatile solute is added to the solvent its freezing point decreases from its initial value. Because presence of non-volatile salts will affect the intermolecular attraction and thereby the energy that must be applied to freeze the compound.
Therefore, the freezing point of water decreases, when sodium chloride is added into it. Thus option D is correct.
To find more about freezing point, refer the link below;
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A gas is under a pressure of 760torr and occupies volume of 525cm3. If the pressure is doubled, what volume would gas now occupy? Assume the temperature is constant?
262. 5cm3.
using the Boyles law formula. p1v1=p2v2
P1=760torr.
v1=525cm³
p2=760×2=1520torr.
v2=?
p1v1=p2v2
760×525=1520×v2
v2=[ 760×525]÷1520
v2= 262.5cm³
when the pressure increases, the volume decreases.
Match the object with its characteristic.
Earth
?
Electromagnet
Venus
?
Permanent magnet
Refrigerator
magnet
?
Not magnetic
Answer:
Earth is electromagnet
Refrigerator is permanent magnet
Venus is not
Explanation:
What is the molarity of a solution?
the answer is The number of moles of a solute per kilogram of solvent
Molar concentration is a measure of the concentration of a chemical species, in particular of a solute in a solution, in terms of amount of substance per unit volume of solution.
Which acid was used in the titration curve below?
HCl
H2 S O4
HNO3
H3PO4
HNO3
Explanation:
hydrochloric acid (HCl), sulfuric acid (H 2start subscript, 2, end subscriptSO 4start subscript, 4, end subscript), nitric acid (HNO 3start
Question 5 of 25
Which type of reaction is shown by this general equation?
Reactants + energy - products
A. Synthesis
B. Combustion
C. Endothermic
D. Exothermic
Answer:
C Endothermic
Explanation:
a. p. e. x
How many moles of ammonia would be required to react exactly with 0.554 moles of copper(II) oxide in the following in chemical reaction? 2 NH3(g) + 3 CuO(s)= 3Cu(s) + N2(g) + 3 H2O(g)
(01.02 LC) Which of the following is a contact force? Select one:
a. Electrical force .
b. Frictional force
c. Gravitational force
d. Magnetic force
Answer:
Frictional Force is contact force.
Answer:
its friction force bcz in friction u become in contact with a surface that produces heat
In a simple model used to analyze UV photoelectron spectra, the orbital energies of the neutral molecule and the cation formed by ejection of an electron are assumed to be the same. In fact, some relaxation occurs to compensate for the reduction in the number of electrons by one. Would you expect the orbital energies to increase or decrease in the relaxati
Answer:
Increases.
Explanation:
The orbital energies increases when the reduction of electron number occurs due to removal from the outermost shell. When we go farther from the nucleus, the energy of orbitals increase. The electron that is farther from the nucleus experience more repulsions because of the shielding effect of other electrons that is present between nucleus and outermost electron. Due to this shielding effect, it is easier to remove the outermost electron which leads to increase orbital energies.
Which of these are an important part of a scientific process?
21. A piece of metal with a a mass of 15.2 g is heated from 17°C to 42°C. In the process it absorbs 1362 J of
energy as heat. What is the specific heat of the metal?
TO
Answer:
3.58J/g°C is the specific heat of the metal
Explanation:
The specific heat of a material is defined as the energy that 1g of the material absorbs and produce the increasing in temperature in 1°C. The equation is:
Q = S*ΔT*m
Where Q is energy = 1362J
S is specific heat of the material
ΔT is change in temperature = 42°C - 17°C = 25°C
And m is the mass of the material = 15.2g
Replacing:
S = Q / ΔT*m
S = 1362J / 25°C*15.2g
3.58J/g°C is the specific heat of the metalWhat characteristic should an isotope used for dating have?
O A. It should have a half-life much shorter than the age of the object
being dated.
B. It should have a half-life that is close to the age of the object being
dated.
O C. It should have a half-life that changes with time in the object being
dated.
O D. It should have a half-life much longer than the age of the object
being dated.
Answer:
B
Explanation:
took the test
D. It should have a half-life much longer than the age of the object being dated. When using isotopes for dating purposes, it is important to choose an isotope with a half-life that is significantly longer than the age of the object being dated.
What is the half-life time?The half-life is the time it takes for half of the radioactive isotopes in a sample to decay into stable isotopes. By measuring the ratio of the original radioactive isotope to the decay product, scientists can determine the age of the object.
The majority of the radioactive material would have decayed if the isotope had a half-life substantially less than the age of the artefact, making it challenging to precisely establish the age.
On the other hand, the dating procedure would become more challenging and unpredictable if the isotope in the object being dated (option C) has a half-life that varies over time.
As a result, an isotope with a long half-life offers a stronger basis for precise dating since it enables sufficient radioactive decay to take place, producing quantifiable and trustworthy data.
Learn more about isotope at:
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In butter, [H3O+] =6.0x10-7 M, what is the pH? Is butter acidic, basic, or neutral?
Answer:
Label each solution as acidic, basic, or neutral based only on the stated pH.
milk of magnesia, pH = 10.5
pure water, pH = 7
wine, pH = 3.0
Solution
With a pH greater than 7, milk of magnesia is basic. (Milk of magnesia is largely Mg(OH)2.)
Pure water, with a pH of 7, is neutral.
With a pH of less than 7, wine is acidic.
Fossils indicate that many organisms that lived long ago are