Answers
Related Questions
What is the molarity of a 3.00 L solution that contains 0.400 mol FeCl3?
1.20 M
0.266 M
7.50 M
0.133 M
Answers
Answer: 0.133 mol/l
Explanation: molality = concentration = 0.400 mol/3.0 l
What is the percent composition HCN?
Answers
Answer:
see calculations in explanation
Explanation:
percent = part/total x 100%
part = ∑ atomic mass of element
hydrogen = 1.008 amu (atomic mass units)carbon = 12.011 amunitrogen = 14.007 amutotal = ∑ molecular mass of compound
= H amu + C amu + Namu
= 1.008 amu + 12.011 amu + 14.007 amu
= 27.026 amu
%H = (1.008amu/27.026amu)100% = 3.730%
%C = (12.011amu/27.026amu)100% = 44.442%
%N = (14.007amu/27.026amu)100% = 51.827%
Check results ∑%values = 100%
3.730% + 44.442% + 51.827% = 99.999% ≅ 100%
What problems might there be if oxygen was very soluble in water?
Answers
Hope this help you!!
Water can dissolve oxygen gas. The oxygen that is dissolved in water is used for respiration by plants and animals that dwell in water. Therefore, oxygen gas that has been dissolved in water is crucial for the survival of aquatic creatures and plants.
What is respiration ?During respiration, carbon dioxide is expelled in the opposite direction, back into the environment, while oxygen is moved from the outside environment to the cells within tissues.
The oxygen molecules become trapped between the open spaces between the water molecules as a result of the creation of hydrogen bonds. Water is a polar solvent, as is well known.
Additionally, the oxygen molecules have pi-electrons, which give them a certain amount of polarity because they are sensitive to polar environments.
The majority of aquatic creatures need oxygen for respiration, and our aquatic ecosystems are at risk if there is an oxygen shortage in the water.
Thus, The oxygen that is dissolved in water is used for respiration by plants and animals that dwell in water.
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Why is it that 1 dm3 of ethanol
not equal to 1 kilogram of
Answers
density of ethanol is 0,79 kg/dm^3 so mass of one dm^3
Is 790 g
5 points! Please don’t guess if u don’t know!
Salts usually have a low melting point.
A. true
B. false
Answers
This is true. that's why we use it for snow
Answer:
false
Explanation:
ya thats why we use it for boiling water
What molecules can cells break down for energy?
The options
A. Very small gas molecules, like carbon dioxide.
B. Large molecules made from glucose, like starch.
C. Small sugars, like glucose.
D. Very small liquid molecules, like water.
Answers
Answer: I think the answer is C)
Explanation:
PLEASE HELP WILL GIVG BRAINLEST
Answers
Answer:
It is option #1.
Explanation:
Biotechnology is defined as, "The exploitation of biological processes for industrial and other purposes, especially the genetic manipulation of microorganisms for the production of antibiotics, hormones, etc."
Therefore, option #1 is your answer!
an unknown sample with a mass of 50.0 grams changes from an initial temperature of 22.5°C to a final temperature of 32.4°C. It is known that the sample absorbed 444 J and f heat l. Bases on this information, what substance in the table is most likely the identity of this sample?
Answers
Answer:
Aluminum
Explanation:
help me please i beg u
Answers
Answer:
none of the above
Explanation:
Which characteristics do hookworms and tapeworms share? Check all that apply.
They are types of roundworms.
They are parasitic.
They have a digestive system.
They cause diseases in humans.
They have nerve cells.
They can be used to treat illnesses.
Answers
Answer:
b,d,e
Explanation:
Predict the shape of the molecule....
Answers
Answer: trigonal bipyramidal
Explanation:
Number of electron pairs = [tex]\frac{1}{2}[V+N-C+A][/tex]
V = number of valence electrons present in central atom
N = number of monovalent atoms bonded to central atom
C = charge of cation
A = charge of anion
[tex]SbCl_5[/tex] :
In the given molecule, antimony is the central atom and there are five chlorine as monovalent atoms.
The number of electron pairs are 5 that means the hybridization will be [tex]sp^3d[/tex] and geometry of the molecule will be trigonal bipyramidal.
2 moles KCl + 3 moles O2 → 2moles KCIO3
Calculate the number of particles of each substance based on the number of moles from the balanced equation
Answers
Answer:
KCl ⇒ 1.205x10²⁴ molecules
O₂ ⇒ 1.807x10²⁴ molecules
KClO₃ ⇒ 1.205x10²⁴ molecules
Explanation:
In order to calculate the number of particles from the number of moles, we have to use Avogadro's number, which states the number of particles in one mol:
In 1 mol there are 6.023x10²³ particles (ions, molecules or atoms).So now we multiply the number of moles of each substance by Avogadro's number:
KCl ⇒ 2 mol * 6.023x10²³ molecules/mol = 1.205x10²⁴ moleculesO₂ ⇒ 3 mol * 6.023x10²³ molecules/mol = 1.807x10²⁴ moleculesKClO₃ ⇒ 2 mol * 6.023x10²³ molecules/mol = 1.205x10²⁴ moleculesHow many grams of NaOH (MW = 40.0) are there in 500.0 mL
of a 0.175 M NaOH solution?
A) 3.50
B) 114
C) 14.0
D) 2.19x10
Answers
Answer:
3.5
Explanation:
500*0.175= 8.75 *40/1000=3500/1000=3.5
Answer:
3.50 grams
Explanation:
Mastering chem
On a very hot day, could you cool your kitchen by leaving the refrigerator door open?
a. Yes, but it would be very expensive.
b. Yes, but only if the humidity is below 50%.
c. No, the refrigerator would exhaust the same amount of heat into the room as it takes out of the room.
d. No, the heat exhausted by the refrigerator into the room is more than the heat the refrigerator takes out of the room
Answers
Answer:c
Explanation:
On a very hot day, No, the refrigerator would exhaust the same amount of heat into the room as it takes out of the room.
What is refrigerator?Eliminating heat from a body but also bringing it down to the lowest temperature actually is the technique of refrigeration. The refrigeration process is carried out in refrigerators.
Therefore, keeping the doorway of an electrical refrigerator open won't help cool the room. In actuality, the refrigerator raises the temperature of the room by removing heat from the freezing compartments as well as rejecting it to the air in the room.
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Match each object to its definition.
A. meteorite
B. meteoroid
C. meteor
->
1. The remains of a rock from space that strikes Earth’s surface
2. A rock that burns up in Earth’s atmosphere
3. A small piece of rock in space
Answers
Answer:
definition 1. goes with B. meteoroid
definition 2. goes with C. meteor
definition 3. goes with A. meteorite
Answer: meteoroid - a small piece of rock in space, meteor - a rock that burns up in Earths atmosphere, meteorite - The remains of a rock from space that strike Earth's surface.
Explanation:
How does burning affect an object's property? Burning can cause an object to increase in volume. Burning changes the chemical make up of an object. Burning can create the item to increase in mass. Burning keeps the chemical make up of an object the same.
Answers
Answer: Burning changes the chemical make up of an object.
Explanation:
A chemical change can be defined as a change in the substance when it combines with other kind of substance to form a new substance. A chemical change can also occur when a substance is broken down into two or more products. These changes cannot be reversed. These changes affect the physical make up of an object. For example, burning as when an object is burned it cannot be transformed into its original form. A wood if burned can be converted into ash, water and carbon dioxide cannot regain its original form after burning so burning brings about chemical change in an object.
Photosynthesis in a plant is an example of which characteristic of living things?
1. Reproduction
2. Response to the environment
3. Growth and development
4. Ability to obtain and use energy
Answers
Answer:
4. Ability to obtain and use energyWhich answer best defines solute ?
Answers
Answer:
a substance that dissolves in another substance
Explanation:
a substance into which another substance dissolves
Answer:
sol·ute
noun
1.
the minor component in a solution, dissolved in the solvent.
A rigid container of O 2 has a pressure of 340 kPa at a temperature of 713 K. What is the pressure at 273°C ?
Answers
Answer:
260 kPa
Explanation:
To answer this problem we can use Gay-Lussac's law, which states that at a constant volume (such as is the case with a rigid container):
P₁T₂=P₂T₁Where in this case:
P₁ = 340 kPaT₂ = 273 °C ⇒ 273 + 273.16 = 546 KP₂ = ?T₁ = 713 KWe input the data:
340 kPa * 546 K = P₂ * 713 KAnd solve for P₂:
P₂ = 260 kPaA word which describes a solution which is more dilute than cytoplasm and would cause a cell to swell with water
Answers
Answer:
A hypertonic solution has increased solute, and a net movement of water outside causing the cell to shrink. A hypotonic solution has decreased solute concentration, and a net movement of water inside the cell, causing swelling or breakage.
Explanation: hope this helps :) sorry if it's wrong :(
A ___________________________ is a mixture in which the properties of thesubstances are spread evenly.
Answers
Answer:
homogenous mixture
Explanation:
Convert 678.92 cm into meters
Answers
Answer:6.7892 meters
Explanation:
Which refers to the force that one massive object exerts to attract another object?
velocity
gravity
acceleration
newt
Answers
Answer:
acceleration
mhmm..whichuksnackru?..fishnchiips OUHHHOOUUHHYESS SandyROASTthatsevenbaetterthanfishnchips
A net force of 66 newtons accelerates a child at 2.0 m/s? down a smooth playground slide. What is the mass of the
child?
A 130 kg
B68 kg
© 64 kg
D 33 kg
Answers
Answer:The answer is D 33
Explanation:
The mass of the child accelerating at 2 m/s² by a net force of 66 N is 33 Kg (Option D)
Relationship between force and accelerationForce is related to acceleration according to the following equation
Force (F) = mass (m) × acceleration (a)
F = ma
With the above formula, we can obtain the mass of the child
How to determine the mass of the child Acceleration (a) = 2 m/s²Force (F) = 66 NMass (m) =?F = ma
66 = m × 2
Divide both side by 2
m = 66 / 2
m = 33 Kg
Thus, the mass of the child is 33 Kg
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dentify whether each element is a halogen, a noble gas, or nonmetal only.
Astatine (At):
Nitrogen (N):
Krypton (Kr):
Chlorine (Cl):
Sulfur (S):
Answers
Astatine : Halogen
Nitrogen : Nonmetal
Krypton : Noble gas
Chlorine : Halogen
Sulfur : Nonmetal
i just needed the points sorryyy
Choose ALL that apply for spring tides Occur twice a month Moon, Sun, and Earth are perpendicular Highest of the high tides and lowest of the low tides. Moon, Sun, and Earth are aligned
Answers
Answer:
Twice a month, sun and earth are perpendicular
Explanation:
Answer:
2 times in a month it happens
Explanation:
hope this helps (:
What are the chemical symbols for the elements calcium, carbon, and chlorine respectively? es
A) CL, C, and Ce
B) C, Ca, and Co
C) Ca. C, and CL
D) Ca, Co, and CL
Answers
Answer:
C
Explanation:
what part of the food chain is a lemming
a:producer
b:secondary consumer
c:primary consumer
d: predator
Answers
hmm...for your answer I think it would be D
Answer:
primary consumer
Explanation:
Lemmings are primary consumers.
Is wrought iron substitutional or interstitial?
Answers
Answer:
interstitial is correct my child
Explanation:
Determine if the following statements are true or false. True Standard reduction potential is an intensive property True Reduction takes place at the anode True The half reaction with the lower standard reduction potential will be at the cathode in a galvanic cell True The half reaction with the higher standard reduction potential will be at the cathode in a galvanic cell
Answers
Answer:
Standard reduction potential is an intensive property---- True
Reduction takes place at the anode ----- False
The half reaction with the lower standard reduction potential will be at the cathode in a galvanic cell ------false
The half reaction with the higher standard reduction potential will be at the cathode in a galvanic cell ------ True
Explanation:
An intensive property is a property of a substance which is inherent in it and part of its nature. It does not depend on the amount of substance present in the substance. Standard reduction potential is an intensive property.
In a galvanic cell, oxidation takes place at the anode and reduction takes place at the cathode. At the anode, the electrode potential is more negative (an oxidation) while at the cathode the reduction potential is less negative (a reduction).
Reduction potential is an intensive property of cell, reduction takes place at cathode of galvanic cell, the half reaction with the lower standard reduction potential will be at the anode in a galvanic cell and half reaction with the higher standard reduction potential will be at the cathode in a galvanic cell.
What is Galvanic cell?
Galvanic cell is also known as voltaic cell, and in this cell electric current is originated from spontaneous redox reaction.
In the galvanic cell, anode is a negatively charged electrode in which oxidation process takes place and value of electrode potential is more negative. Cathode is a positively charged electrode in which reduction process takes place and electrode potential is less negative. And intensive property is not depends on the amount of substance.
Hence, correct statements are true, false, false and true.
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