Answer:
b
Explanation:
PLEASE HELP ME WITH THIS CHEM WORK!!!
I’LL GIVE A BRAINIEST TO WHOEVER GETS IT RIGHT:)
1.) 50.0 grams of water at 100 degrees Celsius evaporated to water vapor 2 points
at 100 degrees Celsius. Calculate the amount of heat required for this
conversion.
2.) A student measured 15.0 grams of ice in a beaker. The beaker was then
placed on a hot plate where it was heated uniformly for a certain amount
of time. During the melting process of the ice, the student noted that the
temperature was at 0 degree Celsius. When all the ice converted to water,
the final temperature was also at 0 degree Celsius. How much heat was
used to melt the ice?
1. Q = 112.8 kJ
2. Q = 5.01 kJ
Further explanationThe heat to change the phase can be formulated :
Q = mLf (melting/freezing)
Q = mLv (vaporization/condensation)
Lf=latent heat of fusion
Lv=latent heat of vaporization
1. m=50 g=0.05 kg
Lv for water = 2256 kJ/kg
[tex]\tt Q=m.L_v\\\\Q=0.05\times 2256\\\\Q=\boxed{\bold{112.8~kJ}}[/tex]
2. m=15 g=0.015 kg
Lf for water = 334 kj/kg
[tex]\tt Q=m.L_f\\\\Q=0.015\times 334\\\\Q=\boxed{\bold{5.01~kJ}}[/tex]
7. Which of the following is always true when a substance undergoes a
phase change? *
O A. The molecules keep moving at the same average speed.
B. The substance becomes a liquid as it heats up.
C. The melting point of the substance changes.
D. The substance is made up of the same type of molecules.
The following answered has been deleted due to multiple violations to our Terms of Service.
please help! An ice cube (25 g) is removed from a freezer at 0 °C. How much energy is required to completely melt the ice cube?
Answer:
So it takes 80 calories of heat to melt 1 g of an ice cube, now do the math. (Hope this helped)
Explanation:
The picture shows a periodic table with elements X and Y.
If the atomic number of element X is 3, then what is the atomic number of element Y?
A. 5
B. 7
C. 19
D. 25
Answer:
7
the atomic number of element X is 3, then atomic number of element Y is 7
PLEASE HELP I'M DOING THIS IN CLASS RIGHT NOW
Explain exactly why metals are such good conductors according to the video you just watched. 2. Which conducts heat more efficiently- a solid, liquid or gas? Why is that (explain on molecular level)?
Answer:
hope this helps have a amazing day! :)
Explanation:
Metals are an excellent conductor of electricity and heat because the atoms in the metals form a matrix through which outer electrons can move freely. Instead of orbiting their respective atoms, they form a sea of electrons that surround the positive nuclei of the interacting metal ions.
When you connect your evidence to your claim you are using your
1. brain
2.reasoning
3. test
Answer:
2. reasoning
Explanation:
PLS GIVE BRAINLIEST
What is the smallest substance? molecule mixture compound
Answer:
Molecule is the smallest i took the quiz and it was that!
Explanation:
Hope I helped! :>
PLEASE HELPP!!!!
10. Using a Periodic Table, complete the chart below. Then, use the simulation to check your
answers by clicking on the appropriate elements to make each compound.
Answer:
Na the valency electrons is 1
The ion charge is positive 1
K the valency electrons is 1
The ion charge is positive 1
Explanation:
Mg the valency electron is 2 The ion charge is positive 2
Ca the valency electron is 2 The ion charge is positive 2
Al the valency electron is 3 The ion charge is positive 3
O the valency electron is 2 The ion charge
is negative 2
F the valency electron is 1 The ion charge is negative 1
Cl the valency electron is 1 The ion charge
is negative 1
N the valency electron is 3 The ion charge is negative 3
S the valency electron is 2 The ion charge is
negative 2
Na the valency electrons is 1, The ion charge is positive 1 and K the valency electrons is 1, The ion charge is positive 1.
What is Valency?Mg the valency electron is 2 The ion charge is positive 2, Ca the valency electron is 2 The ion charge is positive 2 and Al the valency electron is 3 The ion charge is positive 3.
O the valency electron is 2 The ion charge, is negative 2 and F the valency electron is 1 The ion charge is negative 1, Cl the valency electron is 1 The ion charge is negative 1
N the valency electron is 3 The ion charge is negative 3, S the valency electron is 2 The ion charge is negative 2.
Therefore, Na the valency electrons is 1, The ion charge is positive 1 and K the valency electrons is 1, The ion charge is positive 1.
To learn more about valency, refer to the link:
https://brainly.com/question/12744547
#SPJ2
Write the type of each chemical reaction
1. Double Displacement
2.Double Displacement
3. Single Displacement
4. Decomposition
5. Synthesis
6. Combustion
Question 107 points)
(02.04 HC
Use examples to explain how the atmosphere interacts with two other of Earth's spheres. Explain the interaction for each using complete
sentences. (7 points)
Answer:
Evaporation from the hydrosphere provides the medium for cloud and rain formation in the atmosphere. The atmosphere brings back rainwater to the hydrosphere. The atmosphere provides the geosphere with heat and energy needed for rock breakdown and erosion. The geosphere, in turn, reflects the sun's energy back into the atmosphere.
Explanation:
What is the mass in grams of 5.90 mol C₈H₁₈
Answer:
672.6 grams
Explanation:
molar mass of 1 mol of C₈H₁₈ = 114 grams
so mass of 5.9mol of C₈H₁₈ = 114* 5.9= 672.6 grams
A bond formed between a fluorine, F, atom and a fluorine, F, atom is likely to be____
A
ionic bond
B.
polar covalent
C
nonpolar covalent
D
alloy
Answer:
c) non polar Covalent
Explanation:
this is a molecule formed by atoms of the same element . they both have similar electronegativities and thus cancel out . This makes it a perfect Covalent molecule . The fact that it's a symmetrical molecule makes it non polar. a symmetrical molecule is a molecule formed by the overlap of orbitals of two atoms of the same element ( that is to say , there's no dipole )
Which of the following elements would you expect to be ductile and
malleable?
Germanium (Ge)
Argon (Ar)
O O O O
Nitrogen (N)
O Zirconium (Zr)
Answer:
ductile - germanium
mellabe - zirconium
Adaptations can only arise if
there is _______ within a species.
Answer:
Diversity?
Explanation:
Think thats bio
Calculate the percent composition of chlorine in methyl trichloride, CHCl3.
Answer:
Chlorine --> 89%
Explanation:
Step 1) Add each element's amu up to get the total mass of the compound.
12.011+1.008+3(35.453) = 119.378.
Step 2) Divide the total mass of chlorine by the total mass of the compound.
3(35.453) = 106.359
106.359/119.378 = 0.8909430548.
Step 3) Now multiply by 100 to get the percentage.
0.8909430548*100 = 89.09430548%
Step 4) Estimate and submit your answer
89.09430548% estimates to 89%
sulfur (S) = 32, and of oxygen (O) = 16.
8. The relative formula mass of a sulfate, ZSO
is 159.5. The relative atomic mass (A) of
What is the relative atomic mass
of element Z?
A
63.5
B 32.5
C 15.5
Answer:
It should be 115.5 amu but you didnt type that as an answer choice so...
Explanation:
Bruh all you had to do was add oxygen and sulfur and subtract from the total to get your answer :D.
In each case, state whether the forces are balanced or unbalanced. If unbalanced, calculate the net force and describe the direction of the resultant force.
Answer:
Check explanation section.
Explanation:
In order to understand balanced force and unbalanced forces the first law of Newton should be considered as a basic knowledge.
For Balanced forces, there is equal equality in the direction of the forces. In balanced forces, there is no acceleration.
For unbalanced forces, there is acceleration that is go say there is going to be movement. Therefore, net force is equal to unbalanced forces.
(i) Suitcase dropped from a height.
Answer: since there is movement that is acceleration, then the force here is unbalanced force. The resultant force is downwards.towards the greater force direction.
(ii) A bicycle moving with constant velocity on a straight road.
Answer: As the bicycle moves at constant velocity on the straight road the force here is Balanced. Frictional forces balances the forces from the cyclist.
(iii) The rope does not move in a tug of war on applying force at both ends.
Answer: Balanced force.
Examine the diagram of a cell. Which accurately labels the lysosome? W X Y Z
Answer: all of them
Explanation:
Answer:
The answers X i just took the test
Explanation:
Which answer best describes why water dissolve most salts? Water is polar and salts form ions in solution. Water is nonpolar and salts form ions in solution. Water has the same density as salt Water has a different density than salts
Answer: Water is polar and salts form ions in solution.
Explanation:
According to the concept of “Like dissolves like”, the polar solutes dissolve in polar solvents, and non-polar solutes dissolve in non-polar solvents.
Water being a polar solvent due to large electronegativity difference between hydrogen and oxygen is able to interact with the ions of the solute.
As water molecules are also polar in nature. So, oppositely charged ions interact with each other and dissolve in it.
Water can form hydrogen bonds with most of the substances and hence dissolve them . Thus water is considered as a universal solvent.
Answer: Water is polar, and salts form ions in solution
Explanation: Took MYA
what components of blood can be examined
Which of the following can best be described as speed plus direction?A: AccelerationB: DecelerationC: FrictionD: Velocity
Answer:
D
Explanation:
Because speed is a scalar quantity which he has only magnitude and no direction while velocity is a vector quantity because it has both magnitude and direction.
Which of the following are subatomic particles that orbit the outside of an atom?
A.
molecules
B.
electrons
C.
neutrons
D.
protons
Carbon dioxide and ____ are outputs of cellular respiration
Answer:
oxygen
Explanation:
plants use oxygen
When two balls collide, the momentum of the balls after the collision is explained by?
Answer:
(m1+m2)v
Explanation:
where m1 is the mass of the first body
m2 is the mass of the second body
v is the velocity
Water is heated to boiling and water vapor (steam) is released. Chemical change or physical change?
how does sustainable development support in a long term vision
Explanation:
meet .google .com/sxr-wgwg-vnc
Carbon dioxide contains chemical bonds between oxygen and carbon. What particles are between the carbon and oxygen atoms? What keeps those particles between the atoms?
Explanation: i stuck at this Answer:Sometimes atoms share more than one pair of electrons, for example a double covalent bond can occur, as in the carbon dioxide molecule where carbon shares 2 pairs of electrons with each oxygen atom: O=C=O. (where = represents a double bond). Another kind of covalent bonding is called co-ordinate or dative covalent.
A polar covalent bond exists between the atoms in a CO2 molecule. A carbon atom is joined by four covalent bonds to two oxygen atoms, each of which has two covalent bonds.
What are chemical bonds?A chemical bond is a long-lasting attraction between atoms, ions, or molecules that allows chemical compounds to form.
Ionic bonds are formed by the electrostatic force between oppositely charged ions, whereas covalent bonds are formed by the sharing of electrons.
One carbon atom and two oxygens combine to form the carbon dioxide molecule.
Carbon has only four outer shell electrons, whereas oxygen has six. Double covalent bonds form between the atoms, with two electrons from each atom shared, for a total of four bonding electrons.
A CO2 molecule contains polar covalent bonds between its atoms. Four covalent bonds connect a carbon atom to two oxygen atoms, each of which has two covalent bonds.
Thus, this way bond gets formed between carbon and oxygen atoms.
For more details regarding chemical bonds, visit:
https://brainly.com/question/15444131
#SPJ2
Calculate the wavelength of microwaves that have a frequency of 5.67 x 10¹¹ Hz. Please give your answer in scientific notation to the hundredths place. (Don't forget unit!) *
A train travels 846 miles in 9 hours. What is the average speed of the train?
Answer:
The answer is 94 miles an hour.
Explanation:
Speed equals distance divided by the time taken to cover that distance. So to find the average speed of the train just divide the distance covered (846 miles) by the time taken by the train to cover that distance (9 hours) and that equals 846/9 equals 94 miles in one hour.
A car is traveling with velocity of 40 m/s and has a mass of 1120 kg. The car has __________ energy.
A. Kinetic
B. Potential
Answer:
A.
Explanation:
The car has kinetic energy.