Explain why air is not a good conductor of heat
Answer:
Because its molecules aren't in direct contact with eachother.
A student places a small amount of water in a glass dish and then carefully places a small paperclip on the surface of the water. The paperclip floats. What happens if the student adds a drop or two of dish soap to the water? Check all that apply. The paperclip falls through the water to the bottom of the dish. The soap acts as a surfactant. The soap increases the surface tension of the water. The soap decreases the surface tension of the water.
When soap is added then the paper clip will fall as soap is a surfactant and decreases the surface pressure. The surface strain of water holds the paper.
What is the mechanism of floatation?The paper clip is lighter in weight and floats on the water surface as the density and mass play a major role in floatation. Any addition of substances like soap will lead the clip to fall or sink.
The addition of the soap lessens the pressure of the water surface as it is a surfactant and will affect the surface strain of water.
Therefore, when soap is added, paper clips will fall.
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Answer:
1-The paperclip falls through the water to the bottom of the dish.
2-The soap acts as a surfactant.
4-The soap decreases the surface tension of the water.
Explanation:
edge 2022 :)
A 7. 298 g sample of copper reacts completely with oxygen, forming a copper oxide. The final mass of the copper oxide is 8. 217 g. What is the formula of the copper oxide?.
The formula of the copper oxide would be [tex]Cu_2O[/tex]
Chemical formulaMass of copper sample = 7.298 g
Mass of final product after reacting with oxygen = 8.217
Mass of oxygen = 8.217 - 7.298
= 0.919 g
Mole ratios
Cu = 7.298/63.546
= 0.115
O = 0.919/16
= 0.057
Cu = 0.115/0.057
= 2
O = 0.057/0.057
= 1
Thus, the formula for the copper oxide will be [tex]Cu_2O[/tex]
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solve this questions please
Answer:
A
Explanation:
A solid that dissolves in water produce alkaline solutions
ex. sodium reacts with water to form sodium hydroxide – caustic soda
PLEASE HELPPPPPPPPPPP
equilibrium and stability quick check
1. a system is at equilibrium. which statement is correct?
a. The rate of the forward reaction equals the rate of the reverse reaction.
b. The system has been disturbed.
c. there are no changes to the system.
d. The concentration of the reactants equal the concentrations of the product.
The concentration of the reactants equal the concentrations of the product.
At equilibrium the reaction neither moves forward nor backwardSo concentration remains constant.In the chemical equilibrium, the system has no observable changes. It is the state of the equal concentration state of the reactant and the products.
What happens in the chemical equilibrium?It is the dynamic state of the reaction in which the concentration of the chemical reactants and the products of the reaction are in a constant state and the amount does not change.
The chemical reaction does not move forward or backwards unless a disturbing or stressed condition is given to the system.
Therefore, option d. the concentration of the reactants and the products are equal.
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A student who did the same experiment that you did determined the specific heat for all of the metals. His values were all 0. 10 to 0. 20 less than the actual specific heat values. Select all possible sources of this error listed below. The metals were not heated to 100°C. The metals were heated beyond 100°C. The metals cooled before they were added to the water. The thermometer was not completely submerged in the water while reading. The calorimeter was not sealed properly, so heat escaped. Less metal was added to the calorimeter than was massed.
The error source is metals were heated to 100 degrees celsius, they were cooled before water addition, a thermometer was not submerged properly, and the calorimeter was not sealed properly.
What are specific heat and calculation errors?To raise the temperature by one degree of the one gram substance the heat required is called specific heat. The heat given by the system gets absorbed by the surrounding environment.
As the calorimeter was not sealed properly the heat from the system got escaped to the outer environment and the metals of the experiment were not heated till the specific temperature required.
The heat got transferred from the hotter to the cooler environment even before water addition. While taking the readings for the experiment the thermometer was not completely dipped and the values of the specific heat differed.
Therefore, errors during the measuring and estimation vary the calculation.
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How many formula units are in 3.25 moles of (NH4)2SO4
Answer:
Three formula units, Two Ammonium radical and Sulphate radical
Explanation:
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Why do we need to use moles when we try to determine amounts of reactants and products in a reaction?.
[tex]\huge\fbox{Answer ☘}[/tex]
Chemists use the mole unit to represent 6.022 × 10 23 things, whether the things are atoms of elements or molecules of compounds. This number, called Avogadro's number, is important because this number of atoms or molecules has the same mass in grams as one atom or molecule has in atomic mass units.
hope helpful~
Is water wet?
Seriously
Answer:
no its moist
Explanation:
Answer:
I say yes but my friends tell me that it's not because it makes things wet henceforth is not able to be "wet"
Explanation:
it is definitely wet though.
Hope this helps! :)
the checkmarks on thus picture indicating the __________________ factors of an ecosystem
A)Aboiotic
B) biotic
Answer:
We need the picture to answer the question
Explanation:
but i did do this test and number 4 was biotic and number 5 was abotic hope this helped
PLEASE HELP I DONT UNDERSTAND AT ALL I’LL GIVE BRAINLEST
1. An experiment calls for 3 moles of FeCl how many grams of Iron (IIl) chloride would you measure out?
2. Copper sulfate is a common compound how many moles are contained in a 3.2 gram sample?
3. How many moles of solid Iron would be contained in a 112gram sample of Iron?
4. If 12 grams of lead is loaded into a shotgun shell, how many atoms of lead are contained in the shell?
5. If a 6 gram sample of Carbon is measured in a lab how many moles of Carbon is there?
6. Convert 120 grams of Calcium to atoms of Calcium,
7. How many atoms of Vanadium are contained within a 2.63 mole sample?
8. What is the molar mass of Mg0?
9.Cows can produce upwards of 250L of methane in a day. On a particular day Bessy the cow produces 11.16
moles of methane (CHa). How many atoms of methane did Bessy add to the atmosphere that particular day?
10. How many moles of KMnO, are contained in a solution of KMnO, that was created using 0.23 grams of KMnO4?
11. How many grams are there in 3.4 × 10^24 molecules of NH3?
12. A lab calls for 2 grams of (NH4)3 PO3, however the sample you have contains 4.3 moles of (NH4)3 PO3, do you have
enough of a sample to complete the lab? How much more is needed/left over?
13. If 9.3x10^-3 moles of ZnO react in a sample how many grams of zinc oxide were originally present?
14. A sample of NaOH is weighed and measured so that it contains exactly 3.41x10^22 molecules, how many grams
were originally weighed out?
15. Carbon monoxide is a colorless odorless gas that in a closed environment is lethal at 2 ppm, which is .002 grams
per liter of air. A liter sample of air contains 1.01x10^18 molecules of CO, how many grams of CO are present in
the sample.
Answer:
the molar mass of mgo is 40.3
What is the percentage of nitrogen, by mass, in calcium nitrate?.
Answer:
Nitrogen = 17.07%
Explanation:
We are asked to calculate the percentage by mass of nitrogen in Ca(NO3)2.
The molar mass of calcium nitrate is 164,088 g/mol.
In this 164.088 g/mol there are 2 nitrogen atoms.
Molar mass of nitrogen = 14,0067 g/mol
% Nitrogen = molar mass of N/total molar mass of the compound
% Nitrogen =[(2 x 14.0067)/164.088]*100
% Nitrogen = 17.07%
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Look at the map and follow the paths of the Colorado, Gila, and Salt Rivers. Then, answer the following questions
1.What river has the most dams on it?
2.What are the bodies of water behind a dam called?
3.Name three dams on the Colorado River. HELP ME PLS!
Which graph most likely represents a rabbit population that found a new, larger habitat, but then eventually experienced an increase in predation?
Graph A
Graph B
Graph C
Graph D
Answer:c
Explanation:
3 Cu + SHNO3 — 3 Cu(NO3)2 + 2 NO + 4 H20
In the above equation, how many grams of water can be made when 11.9 moles of HNO3 are
consumed?
Considering the reaction stoichiometry, the mass of H₂O that is produced when 11.9 moles of HNO₃ react is 107.1 grams.
Reaction stoichiometryThe balanced reaction is:
3 Cu + 8 HNO₃ → 3 Cu(NO₃)₂ + 2 NO + 4 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Cu: 3 molesHNO₃: 8 molesCu(NO₃)₂: 3 molesNO: 2 molesH₂O: 4 molesThe molar mass of the compounds present in the reaction is:
Cu: 63.54 g/moleHNO₃: 63 g/moleCu(NO₃)₂: 187.54 g/moleNO: 30 g/moleH₂O: 18 g/moleThen, by reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of mass of each compound participate in the reaction:
Cu: 3 moles ×63.54 g/mole= 190.62 grams
HNO₃: 8 moles ×63 g/mole= 504 grams
Cu(NO₃)₂: 3 moles ×187.54 g/mole= 562.62 grams
NO: 2 moles ×30 g/mole= 60 grams
H₂O: 4 moles ×18 g/mole= 72 grams
Mass of H₂O producedIt is possible to determine the the amount of mass of H₂O produced by a rule of three: if by stoichiometry 8 moles of HNO₃ produce 72 grams of H₂O, if 11.9 moles of HNO₃ react how much mass of H₂O will be formed?
[tex]mass of H_{2}O=\frac{11.9 moles of HNO_{3} x72 grams of H_{2}O}{8 moles of HNO_{3}}[/tex]
mass of H₂O= 107.1 grams
In summary, the mass of H₂O that is produced when 11.9 moles of HNO₃ react is 107.1 grams.
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Which describes an effect that ocean currents have on short-term climate change? Ocean currents increase the strength of prevailing winds, which can cool the air and land. Ocean currents can carry cold water, which can cool the air and land. Ocean currents increase hurricane activity, which can raise the temperature of the air and land. Ocean currents carry cold water, which may not affect hurricane activity and lower the temperature of the air and land.
The movement of the ocean and sea waves in a direction is called the ocean currents. Ocean currents can bring cold water, which cools the land and atmosphere.
What are the effects of ocean currents?Ocean currents are the movement of the oceanic waves by the influence of the gravitational forces that can affect the atmosphere and the climate of the region.
Oceanic currents are capable of carrying cold water from polar areas to the regions of the equator resulting in a cooling atmosphere over the geosphere.
Therefore, option B. oceanic currents carry colder air to the warmer regions.
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Answer:
B
Explanation:
what is conduction,convection,and radiation in science brainiest nice and great answer report wrong answer
_______ marshes are the most diverse.
Answer:Freshwater marshes are the most diverse
Explanation:
Answer:
freshwater
i got it right on my test
Hope This Helps :D
a sample of (NH4)2SO4 contains 0.750 mole. what is the mass of the sample
Given the reaction: C3H8 + 5O2 = 3CO2 + 4H2O What is the total number of liters of CO2 produced when 150 liters of O2 reacts completely with C3H8?
If the brine contains 250 g of NaCl, how many moles of Cl2 can be produced?
Which of the following equations is balanced?
Select one:
a. A
b. B
c. C
d. D
Answer:
c
Explanation:
4fe and 6o2 in both sides of C but in other their isnot proper balancing
Answer:
C
4fe4
6O6 so iron and oxygen is balanced
How can you tell the difference between a rock and a mineral?
Answer:
Explanation:
a mineral would have other elemts in its mixture where as a rock would be more simple, the mineral if were to have a metalic element in it would attract magnets to it making it magnetic
please help :)
4NH_3+ 〖3 O〗_2 → 2 NO+6 H_2 O
1. How many grams of NO can be produced from 12 g of NH3 and 12 g of O2?
2. What is the limiting reactant? What is the excess reactant?
3. How much excess reactant remains when the reaction is over?
[tex]\\ \tt\hookrightarrow 4NH_3+3O_2\longrightarrow 2NO+6H_2O[/tex]
#1
We can solve through ammonia or oxygen .Lets go through ammonia
4mol of ammonia produces 2mol NO2mol of ammonia produces 1mol NO1mol of ammonia produces 0.5mol NO.Moles of Ammonia
[tex]\\ \tt\hookrightarrow \dfrac{12}{17}=0.7mol[/tex]
Moles of NO
[tex]\\ \tt\hookrightarrow 0.7(0.5)=0.35mol[/tex]
Mass of NO
0.35(30)=10.5g#2
NH_3 is excess reagent and O_2 is limiting reagent .
#3
We need ∆n
∆n=8-7=1molWhat is Molecules ???
.
.
Good evening (๑•ᴗ•๑)♡
A combination of two or more elements or compound combine each other is called as molecules.
.
.
.
Gud mrng sis
can someone help me ??????????????????????????????????????????
Answer:
Lithium-7
Explanation:
By carefully inspecting the diagram we can see three different sub-particles.
1) Electrons (-vely charged, outside the nucleus)
2) Protons (+vely charged, Inside nucleus)
3) Neutrons (uncharged, Inside nucleus)
Mass Number:
Mass number is the number of protons and neutrons present in the nucleus of an atom.
Therefore, in our problem there are 4 neutrons and 3 protons.
So, the mass number is 7.
Atomic Number:
Atomic number is the number of protons present in the nucleus. This number shows the identity of an atom. If you go through the periodic table you will find that the atomic number 3 is for Lithium.
Result:
Lithium-7
LAB: predicting products
Answer:
1) synthesis MgI2
2) double replacement CuS + (HCl)2
3) double replacement, not sure ab the formula sorry
Rank each of the molecules below in order of the shortest to the longest sulfur oxygen bond length a.SO2 b.SO3^2- c.SO4^2-
Based on factors affecting bond length, the rank from shortest to longest bond length is SO42-, SO32- SO2.
What is bond length?The bond length of a bond is defined as the average distance between nuclei of two bonded atoms in a molecule.
The bond length is determined by the number of bonded electrons also known as bond order.
The higher the number of bonded electrons, the shorter the bond length and vice versa.
SO2 has the least number of bonded electrons, followed by S032- and then SO42-.
Therefore, the rank from shortest to longest bond length is SO42-, SO32- SO2.
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Which of the following models would best represent the inner and outer core of Earth, based on physical characteristics of each layer?
Answer:
No picture :(
Explanation:
There is no picture but if you see a picture wiith a light colored innner core with an orange outer core. thats the one. if you need anymore information just say it :)
Silicate minerals are subdivided into six groups based on the way silica tetrahedra are.
Answer:
The linking together of silica tetrahedra into chains that do not easily move
Explanation:
Answer:
arranged and bonded
Explanation:
silicate minerals are subdivided into six groups based on the way silica tetrahedra are arranged and bonded