Answer:
Q = 2997.69 J
Explanation:
Given that,
The mass of ice, m = 15.6 grams
The temperature increases from -8.76 degrees Celsius to 85.9 degrees Celsius.
The specifc heat of ice is 2.03 J/g°C
We need to find the amount of energy required. The formula for energy required is given by :
[tex]Q=mc\Delta T\\\\=15.6\times 2.03\times (85.9-(-8.76))\\\\=2997.69\ J[/tex]
So, the required heat is equal to 2997.69 J.
How many ammonia molecules can be made with 1 N2 and 3 H2? Please explain.
Answer:
You have described a scenario where nitrogen is the limiting reagent since:
2 N2 + 6 H2 → 4 NH3
You could make four molecules of ammonia and have four molecules of hydrogen left over.
Which statement describes a space-filling model of a molecule?
A.The radii of the atoms are represented by the symbol of the atom surrounded by dots in the
space-filling model.
B.The radii of the spheres in a space-filling model are proportional in size to the radil of the atoms
they represent
C.The radii of the atoms present in the compound determine the length of the bonds in a space-
filling model.
Answer:
Option B, In a space-filling model of a molecule, the radii of the spheres in a space-filling model are proportional in size to the radii of the atoms
they represent
Explanation:
In a space-filling model of a molecule, atoms are represented as sphere. The radius of the sphere is equal to the radius of the atom and the distance between the center of one sphere to the center of other represents the distance between the atomic nuclei
Option B is correct
Option A is incorrect, as dots are used in the space filling model to represent the atoms
Option C is incorrect because radii of atom do not represents the length of the bonds in a space- filling model
Cuando el oxígeno reacciona con el calcio produce un sólido blanco muy utilizado en la preparación de cementos. ¿Cuál de las siguientes reacciones describen el anterior proceso?
Answer:
2Ca + O₂ → 2CaO
Explanation:
Cuando el Calcio (Ca) reacciona con oxígeno (O₂) se produce cal (CaO). La cal es un sólido inodoro de color blanco a grisáceo. La cal es un óxido que se encuentra presente en el cemento y su cuantificación permite determinar la calidad y el tipo de cemento a utilizar.
La reacción que describe el proceso anterior es:
Ca + O₂ → CaO
Para balancear los oxígenos, se deben poner 2 CaO como producto:
Ca + O₂ → 2CaO
Para balancear los calcios, se pone como coeficiente del Ca un 2:
2Ca + O₂ → 2CaOEsta última es la reacción que describe el proceso anterior
The roots of plants are important to photosynthesis because they...
O A
remove glucose from the plant.
ОВ.
remove oxygen from the plant.
OC. provide the water needed.
D. provide the carbon dioxide needed.
Answer:
[tex]\boxed {\boxed {\sf C. \ Provide \ the \ water \ needed}}[/tex]
Explanation:
Photosynthesis is an extremely important process for plants, algae, and some bacteria. It helps create their "food", which is glucose. It is turned into energy so the organism can grow, repair damages, and carry out other processes.
The equation for photosynthesis is as follows:
[tex]H_2O+CO_2+energy \rightarrow C_6H_{12}O_6 + O_2[/tex]
Water, carbon dioxide, and light energy from the sun are converted to glucose and oxygen.
Roots are important for obtaining water. Since they reach into the soil, they can absorb the water. Then, capillary action draws the water up the stem into the xylem and then into the leaves, where photosynthesis occurs.
When the offspring has a new genetic variation that a government neither of us parents it is called
draw Fischer projection for L-ketononose
Answer: acttachec pic
The last carbon have the H on there, forgot to put it in :)
The Fischer projection of L-ketononose is:
H
|
CH₂OH-C=O-H
|
C
|
CH₂OH
Fischer projection is a two-dimensional representation of a three-dimensional molecule. In Fischer projection, the carbon atoms are drawn as vertical lines, and the hydrogen atoms and hydroxyl groups are drawn on the right-hand side or left-hand side of the carbon atoms. The carbonyl group is always drawn at the top of the Fischer projection.
The L-configuration is a type of configuration that is assigned to organic molecules based on the orientation of the hydroxyl group on the penultimate carbon atom. If the hydroxyl group is on the left-hand side of the Fischer projection, the molecule is assigned the L-configuration. If the hydroxyl group is on the right-hand side of the Fischer projection, the molecule is assigned the D-configuration.
In the Fischer projection of L-ketononose, the hydroxyl group on the penultimate carbon atom is on the left-hand side, so the molecule is assigned the L-configuration.
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[tex]plz \: help \: me \: it \: is \: due \: 2moro[/tex]
Answer:
hi.
Explanation:
1. B
2. C
3. A
4. B
5.B
hope this helps
When a computer or end-user uses a made-up IP address as a source address is called?
Answer:
That would be a VPN.
Explanation:
Answer:
Would be a dependant, and the IP address is the host address
What is the difference between the coyotes and the gray squirrel population size in year 11?
Answer:
https://www.northallegheny.org/cms/lib/PA01001119/Centricity/Domain/1330/Concept8ecology.pdf is the cite that i got the answers for that form hop it helps
Explanation:
Answer:
As the squirrel population increases their resources become more scarce, putting a limit on population size
Explanation:
What can be used to measure the ph of a substance
Which of the following describes how a recycling program directly benefits a community economically? The guarantee of no new landfills or incinerators O Fewer city taxes than in non-recycling communities O More potential employment opportunities and revenue O Higher property values than non-recycling communities Mark this and return
Answer:
I guess second option i.e. More potential employment opportunities and revenue because collecting recyclable material needs manpower to collect them, and secondary employment in transport i.e. to collect all the material at one place we need transport and so on!
Calculate the number of moles in 8200 grams of iron
Can someone help me with this?
Answer:
150 moles (2 sig. figs.)
Explanation:
to convert from ...
grams to moles => divide by formula weight
moles to grams => multiply by formula weight
this problem:
Given mass of Iron (Fe) = 8200g
formula wt of Fe = 56g/mole
moles = mass/formula wt = 8200g / 56g/mol = 146.42857 moles (calculator) = 150 moles (2 sig. figs.)
The number of moles in 8200 grams of iron is 57.69 moles of Fe.
What is Mole concept ?Mole is defined as the amount of the substance containing the same number of discrete entities (atoms, molecules, ions, etc) as there are atoms in a sample of pure 12C weighing exactly 12g.
The number of particles present in one mole of any substance is Avogadro Number and is equals to 6.023 x 10²³ particles.
Given ;
Weight : 8200 grams of ironTo find ;
Mole (n) : ?Formula used :
Mole (n) = given weight / atomic weight= 8200 / 56 (atomic weight of Fe = 56 gm)
= 157.69 moles of Fe.
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Why would people with sickle-cell anemia get tired more easily than healthy people?
Explanation:
Because sickle-cells have trouble traveling through the smallest blood vessels, which means that muscles and tissue are not getting oxygen they need.
6 NaOH + 2 Al --> 2 Na3AlO3 + 3 H2 If you start with 258 g of Al, how many moles of Na3AlO3 can you make?
Solution :
Assuming all Al will be consumed in the reaction.
From the given equation, 2 mole of Al produce 2 mole of [tex]Na_3AlO_3[/tex].
So, 1 mole of Al produce 1 mole of [tex]Na_3AlO_3[/tex]. .....statement 1)
Number of moles of Al in 258 gram of Al.
[tex]n = \dfrac{mass}{molar\ mass}\\\\n = \dfrac{258}{27}\ moles\\\\n = 9.556 \ moles[/tex]
Therefore, from statement 1) number of moles of [tex]Na_3AlO_3[/tex] produced is also 9.556 moles.
How
many
moles of water are produced from 12.8 moles of oxygen?
with work
Answer:
12.8 moles
Explanation:
The formula for water is H2O, so for every mole of water, there are two moles of hydrogen and one mole of oxygen.
As the ratio of oxygen particles to water particles is one to one, 12.8 moles of oxygen are required to produce 12.8 moles of water.
Therefore, 12.8 moles of water are produced from 12.8 moles of oxygen (assuming hydrogen is available in excess).
In a _____ molecules move just enough to stay close together but not to stick
Answer:
I think it might be liquid
Answer: in a molecular molecules move just enough to stay close together but not to stick
Explanation:
which metal is the most easily oxidized?
A. highly active metal
B. moderately active metal
C.slightly active metal
D.an inactive metal
Answer:
B. Moderately active metal
Explanation:
Harold’s car has a fuel efficiency of 35 miles per gallon. Frank’s car has a fuel efficiency of 12 kilometers per liter. Who gets better gas milage, Harold or Frank?
Answer: Harold car has better mileage
Explanation: US gallon is 3.785 litres and one mile is 1.6 km.
35 · 1.6 km/ 3.785 l = 14.8 km/l
The Harold's car has a fuel efficiency of 35 miles per gallon and has better gas mileage.
What is efficiency?The efficiency is defined as the peak level of performance that uses the least amount inputs to achieve the highest amount of output.
Effectiveness is the ability to produce a better result, one that delivers more value or achieves a better outcome.
Efficiency is expressed as
Efficiency = output / input
The mileage of Harold's can be calculated as:
US gallon has 3.785 liters and 1 mile is 1.6 km
Thus mileage = 35 x 1.6 km / 3.785 l
= 14.8 km/l
Mileage of Frank's car = 12 x 1.6 km / 3.785 l
= 5.07 km/l
Thus, the Harold's car has a fuel efficiency of 35 miles per gallon and has better gas mileage.
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How is matter conserved through cellular respiration
Answer:
In cellular respiration, complex molecules containing carbon react with oxygen to produce carbon dioxide and other materials. ... Matter is conserved during cellular respiration because atoms are conserved in physical and chemical processes
Explanation:
I hope this helps
In a solution, litmus is blue. The pH of the solution could be
1. 10
2. 2
3. 3
4. 4
Answer:
1. 10
Explanation
when litmus paper is blue that means the solution is basic and 10 on the pH scale is the most basic out of all your options
1.) Magnesium reacts with oxygen and forms magnesium oxide. Write the reaction, and explain how you would find the oxidizing agent
2.) What are two advantages and one disadvantage of fuel cells
3.) How are voltaic and electrolytic cells similar, and how are they different? Include electrodes and their charges in your answer
Answer:
See explanation
Explanation:
1) The reaction of magnesium with oxygen is;
Mg(s) + O2(g) -----> MgO2(s)
The oxidizing agent is the reactant whose oxidation number decreases from left to right in the reaction equation. The oxidation state of oxygen decreased from zero to -2 hence oxygen is the oxidizing agent in the reaction.
2) The advantages of fuel cell includes;
i) it is a clean source of energy
ii) Fuel cells operate quietly and do not constitute noise pollution
One disadvantage of the fuel cell is that its operation is costly.
3) Electrolytic and voltaic cell are similar because they are both electrochemical cells and involve a transfer of electrons between two electrodes.
Electrolytic cells do not operate spontaneously while voltaic cells operate spontaneously. In the volatic cell the anode is negatively charged while the cathode is positively charged. In the electrolytic cell, the anode is positively charged while the cathode is negatively charged.
Help would be appreciated t.t
Answer:
a) H3PO4 (aq) + 3 KOH (aq) → K3PO4 (aq) + 3 H2O (l)
b)
AgNO3 (aq) + NaCl (aq) → AgCl (s) + NaNO3 (aq)
c)
Ca(OH)2 (s) + 2 H3PO4 (aq) → Ca(H2PO4)2 (s) + 2 H2O (l)
d)
2 KI (aq) + Pb(NO3)2 (aq) → 2 KNO3 (aq) + PbI2 (s)
e)
3 H2SO4 (aq) + 2 Al(OH)3 (s) → 6 H2O (l) + Al2(SO4)3 (aq)
All balanced equation for each reaction!!
The difference between sunspots solar flares and prominence
Answer:
Sunspots are cooler and darker than the rest of the Sun's surface. They are marked by intense magnetic activity. Solar prominences are the plasma loops that connect two sunspots. Solar flares and coronal mass ejections are eruptions of highly energetic particles from the Sun's surface.
Explanation:
Answer:
Sunspots are dark areas on the surface of the Sun that are cooler than surrounding areas. They appear in groups, vary in size, and cycle in number over an 11-year period. Solar flares are sudden eruptions of energy from a small area of the Sun's surface. They are extremely hot (10 to 20 million degrees Celsius) and extend into the corona. Solar flares occur near sunspots and can disturb radio communications on Earth.
Explanation:
P4 +6Br2 --> 4PBr3
What is the ratio of the moles of P4 consumed to moles of PBr3 produced?
Answer:
1 mole of P₄ consumed:4 moles of PBr₃ produced
Explanation:
Look at the coefficients in the balanced chemical equation to determine the ratios. For every 1 mole of P₄ consumed (P₄ has a coefficient of 1), 4 moles of PBr₃ would be produced (PBr₃ has a coefficient of 4).
Answer:
[tex]\boxed {\boxed {\sf 1 \ mole \ P_4 consumed \ to \ 4 \ moles \ PBr_3 \ produced}}[/tex]
Explanation:
To find the mole ratio, we must use the coefficients.
[tex]P_4+6Br_2 \rightarrow 4PBr_3[/tex]
This equation is balanced (4 atoms of P and 12 atoms of Br on both sides), so we can go straight to the coefficients.
P₄ doesn't have a coefficient, so 1 is implied Br₂ has a coefficient of 6PBr₃ has a coefficient of 4So according to the coefficients above, for every 1 mole of P₄ that is consumed, 4 moles of PBr₃ are produced. Therefore, the ratio is 1 mole P₄ to 4 moles of PBr₃.
Why is it important for the daughter cells to divide a second time in meiosis?
The second division switches parts of matching chromatids to increase genetic variation.
The second division forms four identical cells to ensure that all offspring have the same
The second division sorts chromosomes into cells that are the same as the parent cells.
The second division forms haploid cells that can combine with other haploid cells during fertilization.
Answer:
The second division switches parts of matching chromatids to increase genetic variation.
Explanation:
Meiosis and fertilization create genetic variation by making new combinations of gene variants (alleles).
Phosphoric acid is delivered to a drinks factory in
concentrated form. Why do you think the acid is not
diluted before transporting it?
Answer:
Because it might be reactive or may lose its property in liquid form..
With the dilution of phosphoric acid, its volume will increase. To avoid the transport cost the acid might not be diluted before transporting.
What is the food additive?
Food additives are the chemicals that are used in food products, that prevent food from spoiling due to bacterial growth.
Food additives are a kind of food preservative that is added to food products to prevent spoilage and retain their nutritional value for a long time. These additives inhibit microbial growth in food.
Different types of food additives are preservatives, nutrients, sweeteners, flavoring agents, antioxidants, and colorants.
Phosphoric acid acts as a preservative and prevents the growth of mold and bacteria in foods with sugary solutions. This increases the shelf life of that beverage and improves affordability.
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In chemical reactions, the number of atoms in the product is ________________.
A. the same as the number of atoms in the reactants
B. less than the number of atoms in the reactants
C. greater than the number of atoms in the reactants
D. the same as the number of molecules in the reactants
Answer:
A
Explanation:
No links or files plz
Answer:
ice should start to melt at 1°
why is the absolute dating of rocks important?
Answer:
The dating of rocks is important because:
Explanation:
its important to know how the rocks have changed.
A ________________ uses chemical formulas to model what happens in a chemical reaction.
Pick 1 of the following
molecule compound
chemical equation
chemical reaction
new chemical
Answer:
Explanation:
Chemical equation