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]
Balance the following chemical equation
Complete and balance each of the following equations for gas evolution reactions HCl(aq)+ZnS(s)>
2HCl(aq) + ZnS(s) ⇒ ZnCl₂(aq) + H₂S(g)
Further explanationEqualization of chemical reactions can be done using variables. Steps in equalizing the reaction equation:
1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c, etc. 2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index (subscript) between reactant and product 3. Select the coefficient of the substance with the most complex chemical formula equal to 1Reaction
HCl(aq) + ZnS(s) ⇒ ZnCl₂(aq) + H₂S(g)
1. give equation
aHCl(aq) + bZnS(s) ⇒ ZnCl₂(aq) + cH₂S(g)
2. make an equation
H, left=a, right=2c⇒a=2c(eq 1)
Cl, left=a, right=2⇒a=2⇒c=1(from eq 1)
Zn, left=b, right=1⇒b=1
So the equation :
2HCl(aq) + ZnS(s) ⇒ ZnCl₂(aq) + H₂S(g)
how does sustainable development support in a long term vision
Explanation:
meet .google .com/sxr-wgwg-vnc
If I have 7 electrons, 7 protons, and 7 neutrons what is my mass?
Answer:
14. The protons and neutrons count, but the electrons do not.
Explanation:
How do the electromagnetic spectrum and visible light connect?
Explanation:
The visible light is a part of the electromagnetic spectrum with the range of 400nm to 700nm.
Visible light is made up of all the colors we can perceive.
The electromagnetic spectrum is a series of radiation. The most energetic have the highest frequency and lowest wavelength. The visible light is part of the spectrum. It is the part of the spectrum that allows for sight.How many H2 and O2 molecules do you need to make exactly 4 water molecules with no leftovers?
The number of H2 and O2 molecules needed should be 4 and 2.
Calculation of the number of H2 and O2 molecules:We know that the water i.e. H2O that comprise of 2 hydrogen and 1 oxygen so in the case when we have to make 4 water molecules so it needed 8 hydrogen and 4 oxygen
So for H2 it needs 4 and for O2 it needs 2
Therefore, The number of H2 and O2 molecules needed should be 4 and 2.
Learn more about oxygen here: https://brainly.com/question/24136784
Indicate the answer choice that best completes the statement or answers the question.
The crust and upper mantle make up Earth's
O a. lithosphere Ob. asthenosphere
O d. continents
Oc. core
Question 2
Question 3
Question 4
Question 5
Question 6
Question 7
Question 8
Question 9
Question 10
Question 11
Question 12
Question 13
Question 14
Question 15
Question 16
Question 17
Question 18
Question 19
Question 20
LO
Answer: lithosphere
Explanation:
continents are a part of lithosphere.
core is a structure of earth
Where would we find yellow bone marrow?
Answer:
Yellow bone marrow can be found in the long bones of the human body one such bone being the femur the yellow bone marrow contains certain stem cells which produce cartilage, fat and bone.
Explanation:
Answer:
Yellow bone marrow can be found within the medullary cavity. You see, the anatomy of a compact bone consists of blood vessels, cartilage, red bone marrow, etc. Within the bone there is spongy bone which holds the medullary cavity, and within this cavity there is yellow bone marrow.
All objects contain matter which statement is true? A. Matter is usually measured in milliliters B. The shape of an object is what gives it matter. C. Matter is a measurement of how big an object is. D. As matter is added to an object, its weight increases
Answer:
D. As matter is added to an object, its weight increases
Explanation:
Please answer it!! Would appreciate a lot!!
Answer:
1 acid
2 neutralization
3 H+ , OH-
4 metal
5 alkali
Jose times how long sugar takes to dissolve in warm water. He conducts four trials of his experiment. What should he conclude from his data?
Trial Time
1 30 seconds
2 32 seconds
3 10 seconds
4 29 seconds
Sugar does not dissolve in water.
The time recorded for Trial 3 may be inaccurate.
His experiment has very low precision.
Answer:
His experiment has very low precision
Explanation:
Precision is how close the answers are together. The answers are increasing in time. So, this makes sence. None of the answers are similar to one another.
On a hot day, the wood gate on the side of my house gets stuck and I have to push very hard to get it open and shut. Describe *on the molecular level* why this is happening. Use these terms in your answer: kinetic energy, molecules
Answer:
Well rust just because the rain and wind sun whatever its meatal it stayed outside too long!
Explanation:
I really dont kno but i hope im right
WILL GIVE BRAINLYEST and 20 points!!!!!!!
explain that atoms of elements combine to make compounds
explain why there are many, but limited, combinations of elements to make compounds
demonstrate with atomic models how atoms can combine in many ways
Answer:
Explanation:
Any substance that contains only one kind of an atom is known as an element. Because atoms cannot be created or destroyed in a chemical reaction, elements such as phosphorus (P4) or sulfur (S8) cannot be broken down into simpler substances by these reactions.
Example: Water decomposes into a mixture of hydrogen and oxygen when an electric current is passed through the liquid. Hydrogen and oxygen, on the other hand, cannot be decomposed into simpler substances. They are therefore the elementary, or simplest, chemical substances - elements.
Each element is represented by a unique symbol. The notation for each element can be found on the periodic table of elements.
The elements can be divided into three categories that have characteristic properties: metals, nonmetals, and semimetals. Most elements are metals, which are found on the left and toward the bottom of the periodic table. A handful of nonmetals are clustered in the upper right corner of the periodic table. The semimetals can be found along the dividing line between the metals and the nonmetals.
Answer:
give him brainlyest my gye
Explanation:
a flask that weighs 450g is filled with 145ml of benzene. the weight of the flask and benzene is found to be 754g. from this information, calculate the density of the benzene.
Show your calculation by uploading a picture. Calculate the molar mass of ammonia, NH3
Answer:
17.04 g/mol
Explanation:
Molar Mass of NH₃
we know that
Nitrogen has 14.01 gram/mol
And Hydrogen has 1.01 gram/mol
but we have 3 Hydrogens So we multiply
1.01 by 3 i.e., 3.03
Now, add
14.01
+ 3.03
17.04
So, The molar mass of ammonia, NH₃ is
17.04 g/mol
-TheUnknownScientist
giveaway!! 2 more coming up.
hope you get it ! <3
Answer:
k
Explanation:
Thank you for hosting <3
Which best describes what is occurring when a door is almost closed and rays of light fan out from the small opening? absorption interference refraction diffraction
Answer:
The correct answer is Option D (diffraction).
Explanation:
Diffraction has been known as a mechanism through which light rays divide across clusters of darkness and light rather than into the colors of the rainbow. That is the twisting of such an obstacle across the sun. In this case, the challenge has been the door from which the illumination moves and bends.Other alternatives are not relevant to the specified case. So, the alternative above would be appropriate.
Answer: D
Diffraction
Explanation:
E D G E 2 0 2 0
What kind of reaction is KI(aq) +AgNO3(aq) --> AgI(s) + KNO3 (aq)
Answer:
A double-replacement reaction
Explanation:
you're welcome
is the valency of carbon 2 or 4
Answer:
4
explanation:Carbon has four valence electrons and here a valence of carbon is four.
Answer:
4
Explanation:
needs four electrons to complete its orbit
what happens during chemical reactions?
Answer:
Energy is given off or absorbed.
Explanation:
A P E X
Lithium is not nearly as abundant as sodium. If sodium ion batteries that function as lithium ion ones were developed, do you think sodium cobalt oxide would still work as the electrode material?
Answer:
No, sodium cobalt oxide would not work as the electrode material
Explanation:
Sodium is a much larger cation than lithium. Remember that ion size is a very important consideration when developing a battery. The ions to be substituted must be nearly of the same size if one ion is to replace the other in a crystal.
Since sodium ions are larger than lithium ions, sodium cobalt oxide would not work as the electrode material in Lithium ion batteries.
as water cruise to a temperature of zero degrees Celsius and form ice water molecules tend to
A. move faster apart
B. vibrate rapidly
C. flow more randomly
D. gradually expand
Answer:
B. vibrate rapidly
Explanation:
Mark above answer as BRILLIANT
is this anwser correct
Answer:
Yes. It is definitely correct
Which type of substance have a definite shape and fixed volume?
Solids only
Liquids and solids
Gases only
Liquids and Gases
I need help please???
Answer:
the answer is the 2nd option
Explanation:
distance is divided by rime
How many mL of ethanol would you
add to water to make 1750 mL of a
40.0% ethanol solution (v/v%)?
Answer:
700 mL of ethanol would be added
Explanation:
Given data:
Volume of ethanol added to make 40% v/v solution = ?
Total volume of solution = 1750 mL
Solution:
We will calculate the 40% 1750 mL which will be the volume of ethanol added to the water to make 40%v/v solution.
(40/100)× 1750 mL
0.4 × 1750 mL
700 mL
700 mL of ethanol would be added.
An experiment was conducted to determine the density of a rock sample. The table shows a partial record of the experiment.
Experimental Record
Mass of Rock
86.59
Volume of Water in the Graduated Cylinder 142.5 mL
?
What information should be recorded in the last row of the table?
Answer: the density of the rock
55.91g/ml
Explanation:
The density of the rock after it had being placed in the cylinder of water so the calculation should look like this:
Volume of water substract the mass of the rock:
And that is 142.5 ml - 86.59g =
Answer 55.91 g/ml
So the density of the rock is 55.91g/ml
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.
Scientists Hydia, Christian, and Trynatie took 100 frogs. They kept 50 of the frogs at 35 degrees C. They kept 50 of the frogs at 25 degrees C. Then they measured how fast each frog's heart beat. What was changed or different BEFORE the experiment began?
Answer: Temperature was kept as an independent variable to observe the changes in the heart beat.
Explanation:
Independent variable can be defined as the variable which can be changed to induce change in an dependent variable which is the outcome of the experiment.
According to the given situation, the temperature in which the frogs were kept changed to observe the changes in the rate of heart functioning. So, the temperature is the independent variable which changed before the experiment began.
The radioactivity of U-235 is of low intensity. Why then were the people of Hiroshima exposed to high intensity radiation in the days and months after the atomic bomb was dropped?
Answer:
Explanation:
What occurred then is as a result of nuclear fission. This occurs as the Uranium-235 split into two smaller nuclei while releasing high energy neutrons. These neutrons bombard existing U-235 in the atmosphere and this reaction continue in a spontaneous manner until a chain reaction is formed of U-235, whose fall out fills the environment. This process was what led to people been exposed to high intensity radiation in the days and months after the atomic bomb was dropped.
