Explanation:
total heat = Heat required to convert 2 kg of ice to 2 kg of water at 0 °C + Heat required to convert 2 kg of water at 0 °C to 2 kg of water at 20 °C.
Heat=mhfg+mCpΔT
Here, m ( mass of ice) = 2 kg
hfg (latent heat of fusion of ice) = 334 KJ
Cp of water (specific heat) = 4.187 KJ/Kg-K
ΔT(Temperature difference) = 20 °C
Therefore, Heat required = 2 x 334 + 2 x 4.187 x (20 - 0 )
Heat reqd= 835.48 KJ
Therefore, to melt 2 kg of ice 835.48 KJ of heat is required.
Help me,I’m so confused ..and explain pls
Answer:
1. is 50...
75/1.5 = 50
2. is 600...
300/5 is 600
3.
Part A: 45 minutes= 0.75 hours
Part B: 5.3
Explanation:
Don't agree? The calculator says other wise....
i checked it its correct.
Iron is a type of metal that has a shiny surface. However, iron can rust easily. Explain
Answer:
Iron, as well as iron alloys, rusts because of a chemical reaction known as oxidation. When iron is exposed to moisture or oxygen, oxidation occurs. During this chemical reaction, iron is converted into iron oxide. ... Both oxygen and moisture are catalysts for rusting.
Answer:
Iron rusts because of of a chemical reaction known as oxidation. During the chemical reaction iron is converted to iron oxide, if it is left unaddressed, the iron oxide will spread, thereby jeopardizing the physical integrity of the iron.
Hello. Can someone help me do these few questions. Thanks
Answer:
In chemistry, an element is a pure substance consisting only of atoms that all have the same numbers of protons in their atomic nuclei. Unlike chemical compounds, chemical elements cannot be broken down into simpler substances by chemical means. Wikipedia
How do double replacement reactions relate to Combustion reactions
Explanation:
A single-replacement reaction replaces one element for another in a compound.
A double-replacement reaction exchanges the cations (or the anions) of two ionic compounds.
A precipitation reaction is a double-replacement reaction in which one product is a solid precipitate.
Solubility rules are used to predict whether some double-replacement reactions will occur.
During an experiment, it is observed that iron powder sinks in water and sulfur powder floats in water. What will most likely be observed when sulfur powder and iron powder are mixed together and then added to water?
Answer: The iron will sink and the sulfu will float
Explanation: The iron/sulfu mixture only mixes the two elements. Unless one ignites them, they will remain elements and can be separated based on the difference in their densities.
calculate the mass of iron (iii) carbonate that will be formed when 15.0 mL of 0.15 M iron (iii) chloride solution are reacted with 20.0 mL of 0.15 M sodium carbonate. Be sure to write the balanced metathesis reaction that is occuring.
Answer:
The molar mass of a substance is calculated as the mass of a given chemical compound or substance, which is then divided by the amount of the substance. The mass is calculated in grams and the amount of the substance is calculated in mol. Thus, the standard unit for molar mass is g/mol.
Explanation:
According to the given question, the reaction between iron chloride and sodium carbonate will be given as:
[tex]\text {3Na_{2}CO_{3}\text} \;\[+\] \;\text{ 2FeCl_{3} \text}\; \rightarrow\; \text {6NaCl}\; \[+\] \;\text { Fe_{2} (CO_3)_{3} \text}[/tex]
Now, to calculate the mass of iron carbonate formed in the above chemical reaction, it will be given as:
[tex]{ \text Moles\;of}\text \;\text {FeCl_{3} \text} \[=\dfrac{0.15 \;\text {moles} \times 0.015\; \text L}{1.0 { \;\text L}\text}[/tex]
[tex]=\;0.00225\; \text {moles}\text[/tex]
Similarly, for sodium carbonate
[tex]\text Moles\; of\; Na_{2}CO_{3}}\te \[=\]\dfrac{0.15 \;\text {moles} \times 0.020\; \text L}{1.0 { \;\text L}\text}\\[/tex]
[tex]\[=\]\;0.0003\; {\text moles \text}[/tex]
Limiting reactant is [tex]\text {FeCl_{3} \text}[/tex]
Now, calculating iron chloride mass:
[tex]=\dfrac{0.00225 \times 1\;\text{moles}\;\text{Fe}_2 {(\text{CO}_3)}}{2\;\rm{moles\;of\;}Fecl_3}[/tex]
[tex]=0.001125 \;\text {moles }[/tex]
Now, molar mass of the [tex]\text{Fe}_{2}\text{CO}_{3}[/tex] will be [tex]=291.71679\;\text{g/ mol}[/tex]
[tex]\begin{aligned}\text{Mass}&=\frac{\text{Moles}}{\text{Molar mass}}\\\\&=\frac{0.001125\;\text{moles}}{291.71679\; \text{g/mol}} \\\\&=3.85648\times10^{-6} \end{aligned}[/tex]
Use the drop-down menus to complete the statements.
__________have a definite shape and volume.
__________do not have a definite volume or shape.
___________have a definite volume, but the shape may change.
Answer:
Solids, Gasses, Liquids
Explanation:
Solids are rigid structures that have a definite share and volume.
Gasses will continue to spread indefinitely until pressure prevents further spreading.
Liquids have a volume but take the shape of the container they are in.
i really need help please
Answer: its blank???
Explanation:
Earth and Jupiter are shown next to each other. Earth is much smaller than Jupiter.
Why is Jupiter so much larger than Earth? Check all that apply.
Inner planets were created at higher velocities.
Outer planets have less gravity than inner ones.
Outer planets attracted helium, hydrogen, and other gasses.
Inner planets formed where temperatures were cooler.
Gases escaped from inner planets and not from outer ones.
Answer:
A, C, and E. I hope you have a good day.
Explanation:
Answer:
1, 3, and 5
Explanation:
Water and carbon dioxide being converted to glucose
a
Chemical Change
b
Physical Change
Answer:
Chemical change
Explanation:
Calculate the mass of 2.75 moles of ammonia.
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Explanation:
1 grams Ammonia to mol = 0.05872 mol
mass of ammonia = 2.75÷ 0.05872
mass of ammonia=46.8324250681 gm
Answer:
[tex]\boxed {\boxed {\sf 46.8 \ g \ NH_3}}[/tex]
Explanation:
We are asked to calculate the mass of 2.75 moles of ammonia.
1. Molar MassWe convert moles to grams using the molar mass or the mass of 1 mole of a substance. These values are equivalent to the atomic masses on the Periodic Table, but the units are grams per mole instead of atomic mass units.
Look up the individual elements in the compound of ammonia: NH₃
Nitrogen: 14.007 g/mol Hydrogen: 1.008 g/molNotice that there is a subscript of 3 after H in the chemical formula. There are 3 moles of hydrogen in 1 mole of ammonia. We must multiply hydrogen's molar mass by 3 before adding nitrogen's molar mass.
H₃: 1.008 * 3 = 3.024 g/mol NH₃: 14.007 + 3.024 = 17.031 g/mol 2. Convert Moles to GramsWe convert using dimensional analysis. First, set up a ratio using the molar mass.
[tex]\frac {17.031 \ g \ NH_3}{ 1 \ mol \ NH_3}[/tex]
We are converting 2.75 moles of ammonia to grams, so we multiply the ratio by this value.
[tex]2.75 \ mol \ NH_3 * \frac {17.031 \ g \ NH_3}{ 1 \ mol \ NH_3}[/tex]
The units of moles of ammonia cancel.
[tex]2.75 * \frac {17.031 \ g \ NH_3}{ 1}[/tex]
[tex]46.83525 \ g \ NH_3[/tex]
3. RoundThe original measurement of moles (2.75) has 3 significant figures, so our answer must have the same. For the number we calculated, that is the tenth place. The 3 in the hundredth place tells us to leave the 8 in the tenth place.
[tex]46.8 \ g \ NH_3[/tex]
There are approximately 46.8 grams of ammonia in 2.75 moles of ammonia.
A kind of scientific idea that tells you what will happen in a specific situation is a(n)
Answer:
technology scientific methods
Answer:
[tex]⚪ \: { \sf{law}}[/tex]
1. Is the reaction between magnesium and oxygen in the air spontaneous?
Answer:
Once ignited, a ribbon of magnesium metal burns freely in air to form solid magnesium oxide in the form of a white powder. The reaction is plainly spontaneous even though ΔS is negative.
HELP IM TIMED!!!!!!!!!
Yellowstone National Park has an average of about 4500 bison living in it. The park covers 3472 square miles. What is the population density of bison living in Yellowstone? a. 1.3 bison/mi^2 b. 16 bison/mi^2 c. 77 bison/mi^2 d. 0.77 bison/mi^2
Answer:
A. 1.3 bison/mi^2
Explanation:
4500 bison divided by 3472 sq miles is 1.3 bison per mile squared.
2. What evidence is there that green ink is a mixture?
Answer:
The fact that the green ink separated from the rubbing alcohol proves that it is indeed a mixture.
The charge of most poly atomic ions is _____
Explanation:
They mostly have negative charges
Is it correct or wrong
Answer:
i think correct
Explanation:
i am not sure but i hope it will help you
which elements are liquid in the periodic table?
Matter doesn't have to take up space as long as it has mass.
Answer:
Matter always takes space (or has volume).
Answer:
False. Everything that has mass takes up space.
Explanation:
WHATS H2O??????????????
Answer:
Explanation:
water
H. 2. O is the chemical formula for water, meaning that each of its molecules contains one oxygen and two hydrogen atoms
Adding the number of protons to the number of neutrons determines what about the atom?
A
the atomic number
B
the atomic mass
(Hint: protons + neutrons = ?)
Use you observation to determine which polymorph is in the customer’s returned chocolate sample.
Answer:
Cocoa butter, the fat in chocolate, can crystallize in any one of 6 different forms (polymorphs, as they are called). Unfortunately, only one of these, the beta crystal (or Form V), hardens into the firm, shiny chocolate that cooks want. Form VI is also a stable hard crystal, but only small amounts of it form from the good beta (Form V) crystals upon lengthy standing. When you buy commercial chocolate it is in the form of beta crystals.
When you melt chocolate and get it above 94° F, you melt these much desired beta crystals and other types of crystals can set up. If you simply let melted chocolate cool, it will set up in a dull, soft, splotchy, disgusting-looking form. Even the taste is different. Fine chocolate has a snap when you break it and a totally different mouthfeel from the other cocoa butter forms.
Answer:
When you melt chocolate and get it above 94° F, you melt these much desired beta crystals and other types of crystals can set up. If you simply let melted chocolate cool, it will set up in a dull, soft, splotchy, disgusting-looking form. Even the taste is different. Fine chocolate has a snap when you break it and a totally different mouthfeel from the other cocoa butter forms.
Explanation:
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Give reasons. mass is called a physical quantity.
Answer:
Mass is a Physical quantity
Explanation:
It is a fundamental physical quantity because it cannot be derived from other physical quantities.
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.
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Hope it helps
Tyrone and Valerie wanted to determine what feature of a paper airplane would cause it to fly the farthest. Tyrone made his airplane with longer wings than Valerie's airplane. Valerie's airplane had shorter wings than Tyrone's. After testing the two airplanes several times, the data shows that wider wings help airplanes fly farther than shorter wings.
Which characteristic of science is missing from this experiment?
The question is not testable because paper airplanes are always changing.
The phenomenon is not observable because air resistance changes.
The experiment is not replicable because controlled variables are not included.
The results are not reliable because the airplanes were only tested one time.
The characteristic of science that is missing from this experiment is that "the results are not reliable because the airplanes were only tested one time".
Some of the characteristics of science include objectivity, verifiability , reliability, accuracy, observable, precision etc.
Based on the question asked, the results of the experiment are not reliable due to the fact that the the airplanes were only tested one time. The airplanes should have been tested multiple times to show that they are reliable.
In conclusion, the correct option is D.
Read related link on:
https://brainly.com/question/5500131
Answer:
D
Explanation:
How long does S waves travel through earths crust
Answer:
For the distance range 50 to 500 km, the S-waves travel about 3.45 km/s and the P-waves around 8 km/s.
IF HELPED MARK AS BRAINLIEST
Answer:
For the distance range 50 to 500 km, the S-waves travel about 3.45 km/s and the P-waves around 8 km/s.
At constant pressure and volume, the density of a gas _____ as the molar mass increases. A gas made of heavier particles will have a _____ density than a gas composed of lighter particles under the same conditions of temperature and pressure.
Answer:
Increases, higher
Explanation:
Remember that the formula for Density is D=mass/volume.
If volume remains the same, as mass increases the density will also increase as the numerator of this math problem increases while the denominator remains the same.
(a) At constant pressure and volume, the density of a gas increases as the molar mass increases.
(b) A gas made of heavier particles will have a greater density than a gas composed of lighter particles under the same conditions of temperature and pressure.
Ideal gas equationThe relationship between density and molar mass is given in the following equations;
PV = nRT
PV = (m/M) RT
PV = (ρV/M)RT
P = (ρ/M)RT
P = (ρRT)/M
PM = ρRT
where;
P is pressureρ is densityM is molar massThus, we can conclude that, at constant pressure and volume, the density of a gas increases as the molar mass increases.
A gas made of heavier particles will have a greater density than a gas composed of lighter particles under the same conditions of temperature and pressure.
Learn more about density of gases here: https://brainly.com/question/18992505
the atomic number of calcium is 20 . the maximum possible numbers of electron in m-shell is a 2 b 8 c 18 d 10
Answer:
8
Explanation:
Electronic configuration of Calcium = 2, 8, 8, 2
M shell = 3rd energy level
Maximum number of shells in m shell is 8
what is mass in chemistry definition?
Answer: mass is the amount of matter in one object or substance
Explanation:
Can someone help me on this
1. The compound 2NaCl consists of A.2 atoms of sodium element B. 1 atom of
chlorine element C. 3 atoms of sodium element D. 1 atom of sodium element
2. The valency of iron in iron (III) sulphate is A.3 B.2
C.4
D.5
3.The systematic name of the compound Cuso, is A. Copper (I) sulphate B.Copper
(II) tetraoxosulphate C.Copper (II) tetraoxosulphate (IV) D.Copper (II)
tetraoxosulphate (VI)
Answer:
1. The compound 2NaCl consists of:
» B. 1 atom of chlorine element.
» D. 1 atom of sodium element.
2. The valency of iron in iron (III) sulphate is:
» A. 3 [ valency of only iron ]
» B. 2 [ valency of only sulphate ion ]
3.The systematic name of the compound CuSO4:
» B. Copper (II) sulphate
Explanation:
[tex].[/tex]
Answer:
1) A.
2) A.
3) A.