Answer:
[tex]\boxed {\boxed {\sf B. \ 22 \ grams}}[/tex]
Explanation:
We need to use the formula for heat of vaporization.
[tex]Q=H_{vap}*m[/tex]
Identify the variables.
The heat absorbed by the evaporating water is the latent heat of vaporization. For water, that is 2260 Joules per gram. Q is the energy, in this problem, 50,000 Joules. m is the mass, which is unknown.[tex]H_{vap}=2260 \ J/g\\Q=50,000 \ J \\[/tex]
Substitute the values into the formula.
[tex]50,000 \ J=2260 \ J/g*m[/tex]
We want to find the mass. We must isolate the variable, m.
m is being multiplied by 2260 J/g. The inverse operation of multiplication is division. Divide both sides by 2260 J/g.
[tex]\frac{50,000 \ J}{2260 \ J/g} =\frac{2260 \ J/g*m}{2260 \ J/g}[/tex]
[tex]\frac{50,000 \ J}{2260 \ J/g} =m[/tex]
Divide. Note that the Joules (J) will cancel each other out.
[tex]\frac{50,000 \ }{2260 \ g} =m[/tex]
[tex]22.1238938 \ g =m[/tex]
Round to the nearest whole number. The 1 in the tenth place tells us to leave the number as is.
[tex]22 \ g \approx m[/tex]
The mass is about 22 grams, so choice B is correct.
1. Salt has the chemical formula NaCl because it is made up of atoms of Sodium (Na) and Chlorine (CI).
Which statement most accurately describes this compound in relation to the elements it is made of?
A. When sodium and chlorine chemically combine they create a substance with completely different
properties
B. Salt has similar properties to the sodium and chlorine it is made of
C. Once salt is formed the sodium and chlorine atoms no longer exist, only salt atoms
D. Salt can easily be separated back into sodium and chlorine atoms through physical means
Answer:
A
Explanation:
When Na atom chemically combine with with Cl atom to form NaCl both atoms loose their chemical properties due to the fact that Na atom transfer an electron to cl atom. after transfer of electron Na atom become Na ion (cation) and Cl atom become Cl ion (anion)
(ii) I cannot make the payment today.
(Use 'made' without changing the tense)
Answer:
I made the payment today.
Explanation:
H2O is polar covalent or its Hydrogen bond??? PLEASE HELP!!!
Answer:
Polar covalent.
Explanation:
The covalent bonds are therefore polar, and the oxygen atoms have a slight negative charge (from the presence extra electron share), while the hydrogens are slightly positive (from the extra un-neutralized protons). Opposite charges attract one another.
compare the two types of optical telescopes
Answer: Reflectors use a mirror to collect the light, whilst refractors use a lens while, Refractor telescopes require a large lens at the front to direct the incoming light to the lens.
A bridge usually has expansion joints. They allow the bridge to become slightly longer when it experiences thermal expansion. Look at the
diagram of the bridge joint.
When the weather becomes cool, the "teeth" of the joint move away from each other. When the weather becomes warm, they move toward each
other. Which statement is true about the particles that make up the bridge?
A When the sides of the joint are close together, the particles have more kinetic energy than they do when the sides are farther apart.
B. When the sides of the joint are far apart, the particles have more kinetic energy than they do when the sides are closer together
C. The particles contain the same amount of kinetic energy no matter how much the bridge has expanded.
D. The kinetic energy of the particles changes, but the amount it changes does not depend on the temperature of the bridge,
Answer:
I need help please!!!!!!!!!!!!!!
Explanation:
An animal cell placed in a hypertonic solution will shrink in a process called crenation. An animal cell placed in a hypotonic solution will swell and potentially burst in a process called hemolysis. To prevent crenation or hemolysis, an animal cell must be placed in an isotonic solution such as 0.9% (m/v) NaCl or 5.0% (m/v) glucose. This does not mean that a cell has a 5.0% (m/v) glucose concentration; it just means that 5.0% (m/v) glucose will exert the same osmotic pressure as the solution inside the cell, which contains several different solutes. A red blood cell is placed into each of the following solutions. Indicate whether crenation, hemolysis, or neither will occur.
Solution A: 3.21% (m/v) NaCl
Solution B: 1.65% (m/v) glucose
Solution C: distilled H2O
Solution D: 6.97% (m/v) glucose
Solution E: 5.0% (m/v) glucose and 0.9%(m/v) NaCl
Drag each solution to the appropriate bin.
Answer:
Solution A: 3.21% (m/v) NaCl ⇒ CRENATION
Solution B: 1.65% (m/v) glucose ⇒ HEMOLYSIS
Solution C: distilled H₂O ⇒ HEMOLYSIS
Solution D: 6.97% (m/v) glucose ⇒ CRENATION
Solution E: 5.0% (m/v) glucose and 0.9%(m/v) NaCl ⇒ CRENATION
Explanation:
Isotonic solution = 0.9% (m/v) NaCl or 5.0% (m/v) glucose
Crenation will occur if the solution has a concentration higher than 0.9% (m/v) NaCl or 5.0% (m/v) glucose (hypertonic solution). This will occur in the following solutions:
Solution A: 3.21% (m/v) NaCl > 0.9% (m/v) NaCl
Solution D: 6.97% (m/v) glucose > 5.0% (m/v) glucose
Solution E: 5.0% (m/v) glucose and 0.9%(m/v) NaCl (the addition of the 2 components exceeds the osmotic pressure permitted).
Hemolysis will occur if the solution has a concentration lower than 0.9% (m/v) NaCl or 5.0% (m/v) glucose (hypotonic solution). This is the case of:
Solution B: 1.65% (m/v) glucose < 5.0% (m/v) glucose
Solution C: distilled H₂O = 0% glucose/0% NaCl < 0.9% (m/v) NaCl or 5.0% (m/v) glucose
Easy Chemistry/ Help
Magnesium reacts with hydrochloric acid to produce hydrogen gas and magnesium chloride. What
volume of hydrogen gas is theoretically produced in cubic millimeters, if 4.9 g magnesium reacts
with excess hydrochloric acid? The reaction is taking place at 101.5 kPa pressure and 20°C.
using PV=mRT/Mr
V=(4.9×8.31×(273+20))/(24.3×101.5×10^3)
=4.84×10^-3 m^3
=4.84×10^6 mm^3
I WILLL GIVE YOU BRAINLYESTTT PLEASE HELPPPP
Answer:
10.99s
Explanation:
Given parameters:
Speed of the fly = 9.1m/s
Distance flown = 100m
Unknown:
Time taken to fly this distance = ?
Solution:
Speed is distance divided by the time;
Mathematically;
Speed = [tex]\frac{distance}{time}[/tex]
Time = [tex]\frac{distance}{speed }[/tex]
Insert the parameters and solve;
Time = [tex]\frac{100}{9.1}[/tex] = 10.99s
how is all the “stuff” around us matter is because it is made up of atoms?
Answer:
Matter is the Stuff Around You
Matter is everything around you. Atoms and compounds are all made of very small parts of matter. ... Matter is defined as anything that has mass and takes up space (it has volume).
Explanation:
hope it was helpful
Need help please ! if someone can answer any of these that would be great !!
Answer:
NH4 ClBa Br2Al4 C3Na2 OK3 PO4Ca F2Li3 NBa CO3Al2 (SO4)3Mg (NO3)2Li2 SNa2 SO4Ca (HCO3)2Ag CH3 COOZn (OH)2Explanation:
Here are all of them- your picture had #1-13, but here's #1-15!Use the following to answer questions. Which of the following is/are not characteristic of an ionic compound?
I. Metal bonded to a nonmetal
II. Conducts electricity when dissolved in water
III. Called a ‘salt.’
IV. High melting point
V. Lattice structure
VI. Electrons are shared between elements
Group of answer choices
VI only
II, IV, and VI
I and III
II and V
Answer:
VI only
Explanation:
answer the question
How did the substance oxygen change the world??
Answer: The atmosphere of Earth wasn't always full of oxygen. ... An accidental mutation would some day change the world forever as these organisms would become able to feed off of the sunlight around them, and produce oxygen in a process known as photosynthesis. This oxygen, which none of these organisms could use, was toxic.
How does energy
change from
potential to
kinetic?
Answer:
An object has potential energy, stored energy, when it is not in motion. Once a force has been applied or it begins to move the potential energy changes to kinetic energy, or motion energy.
Good luck, hope this helped!
Is it necessary to prepare sodium extract to detect nitrogen in urea ?
Answer:
I think No
Explanation:
Helpppppp i hate chemistry
I will give brainiest who helps me with the correct answer
I promise
5. Name the compound which contain Strontium, Fluorine, and Oxygen.
Options:
Strontium fluorate
Strontium fluoride
Strontium chlorate
Strontium fluorine
What igneous rock is non-vesicular and glassy in texture and has a mafic composition?
Answer:
igneous rock
Explanation:
Antacids relif hyperacidity. why? plz help me!!!!
What is evidence that a chemical change has happened?
O A. The temperature of a substance increases or decreases.
B. The amount of matter increases.
C. A substance changes into a new kind of substance.
O D. You observe a color change.
Please help :) —————————————
Answer:
I can't see what the picture says
List the 5 signs of a CHEMICAL REACTION
ehat coefficient would go in the box
Answer:
1.nhl
Explanation:
What does temperature measure in a sample of matter? A.The exact speed of the particles B.The average kinetic energy of the particles C.The average number of particles D.The exact atomic number of the particles
Plz answer
Answer: its B. The average kinetic energy of the particles.
Don’t trust the person above
Explanation:
I took the quiz and i got it right
A Temperature is a unit used to represent hotness or coolness on any of a number of scales, including Fahrenheit and Celsius. The direction that heat energy will spontaneously flow depends on temperature. The average kinetic energy of the particles is indicated by temperature. The correct option is B.
Temperature and heat are connected but distinct concepts. The average kinetic energy of a substance's particles is measured by its temperature. The kinetic energy of an object increases with its temperature. A sort of energy connected to motion is called kinetic energy.
The average kinetic energy of the particles in a substance is measured by temperature. The overall kinetic energy of the particles in a substance is measured by its thermal energy. The temperature and thermal energy of a substance increase with particle mobility.
Thus the correct option is B.
To know more about temperature, visit;
https://brainly.com/question/23411503
#SPJ6
What is the frequency of a photon with an energy of 3.38 x 10-19 J?
[tex]\huge\boxed{5.1x[tex]10^{14}[/tex]Hz}[/tex]
_____________________________________DATA:E = [tex]3.38 x 10^{-19}[/tex]
h = [tex]6.625x10^{-34}[/tex]
f = ?
_____________________________________SOLUTION:Energy of Photon is given by,
E = hf
Rearrange the equation,
f = [tex]\frac{E}{h}[/tex]
where,
E = energy
h = planck's constant
f = frequency
------------------------------------------------------------------------------------------------------------
Substitute the variable in the equation,
f = [tex]\frac{3.38x10^{-19}}{6.62x10^{-34}}[/tex]
Simplify the equation,
f = 5.10 x 10^14 Hz
_____________________________________Best Regards,'Borz'
Answer:
b. 5.10 x 10^14 Hz
Explanation:
Please help meee! It would be awesome if you can!
Answer:
3) the north Pacific Ocean
Explanation:
Maritime polar air is defined officially as: Maritime polar (mP) air masses are cool, moist, and unstable. Some maritime polar air masses originate as continental polar air masses over Asia and move westward over the Pacific, collecting warmth and moisture from the ocean
Basically it's the North Pacific Ocean because of the higher latitude and colder air temperature
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Answer:
fsdafdsafdsafdsafdasfsagfd
Explanation:
HELLPPP PLEASE. 50PTS
ITS URGENT
Ella wants to construct an electrochemical cell using the following materials :
1.Salt water (as electrolyte)
2.Copper strip
3.Zinc Strip or Aluminum foil
4.Voltmeter and/or LED (to confirm the passage of electric current)
5.Two beakers
6.Insulated wires
Questions
1.If Ella can't find the copper strip can she use copper wire?
2. Are there any other materials she will need? If so state them.
3. What can she use as a substitute for insulated wire.
4.Write a step to step procedure on how she can construct an electrochemical cell using the given materials listed above.
Answer:
1. Yes, it will have the same effect.
2. No, she will not need anything else.
3. Bare wires.
4. Fill the two beakers up with electrolyte. Connect the two terminals with the wire and put electricity through. Connect the voltmeter to the circuit. And finally, put the two terminals into the two beakers.
Explanation:
Hope this helped!
What will the core contain
what happens to the temperatures when we have direct sunlight vs indirect sunlight?
Explanation:
When we have direct sunlight, the temperature is higher compared to indirect sunlight.
Direct sunlight is usually overhead whereas indirect sunlight is at an angle to the surface.
Direct sunlight impacts the surface with more energy concentrated on a smaller surface area. This warms the surface more. Indirect sunlight is diffuse and spreads over a wider area. This leads to a reduction in temperature.