Answer:
Explanation:
scheelite is CaWO₄
Mol weight = 288
80 g of scheelite = 80 / 288 = 27.77 x 10⁻² moles
27.77 x 10⁻² moles of scheelite = 27.77 x 10⁻² x 6.02 x 10²³ molecules of scheelite
= 167.17 x 10²¹ molecules of scheelite
1 molecule of scheelite contains 4 atoms of oxygen
167.77 x 10²¹ molecules of scheelite contains 4 x 167.77 x 10²¹ atoms of oxygen .
= 671.08 x 10²¹ atoms of oxygen .
= 671 x 10²¹ atoms .
Glve the orbital configuration of the following elements using the s, p, d, f type representation. (Answer format Is: 1se2 =
1s)
hellum, nitrogen, silicon
hellum nitrogen silicon
Answer:
Hellium (He): 1s2
Nitrogen (N): 1s2 2s2 2p6
Silicon (Si): 1s2 2s2 2p6 3s2 3p2
The orbital configuration of following elements is as follows:i) helium- 1 s² ii)nitrogen- 1 s² 2 s² 2 p³ iii)silicon-1 s² 2 s² 2 p⁶ 3 s² 3 p²
What are elements?It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.
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(04.02 LC)
During photosynthesis, water and carbon dioxide become glucose and oxygen.
True
False
Answer:
true............,....
Answer:False
Explanation:
This statement is false. Correct statement: Photosynthesis produces glucose and oxygen. ... In this process, plants produce glucose and oxygen from carbon dioxide and water in the presence of sunlight. Photosynthesis converts light energy into chemical energy.
What are a few ways diseases spread?
Answer:Through Direct or indirect contact with an infected person or animal, through air or contaminated food and water.
Explanation:
Following a chemical reaction that produced 5.06 grams of magnesium chloride, the lab report was prepared to
document the results. The expected result was estimated to be 8.85 grams. What are the percent yield and percent
error that are to be included in the lab report?
Percent Yield
Percent Error
Answer:
1. Percentage yield = 57.2%
2. Percentage error = 74.9%
Explanation:
From the question given above, the following data were obtained:
Actual yield = 5.06 g
Experimental yield = 8.85 g
Percentage yield =?
Percentage error =?
1. Determination of the percentage yield.
Actual yield = 5.06 g
Experimental yield = 8.85 g
Percentage yield =?
Percentage yield = Actual yield /Experimental yield × 100
Percentage yield = 5.06 / 8.85 × 100
Percentage yield = 57.2%
2. Determination of the Percentage error.
Actual yield = 5.06 g
Experimental yield = 8.85 g
Percentage error =?
Percentage error = |Experimental – Actual| / Actual yield × 100
Percentage error = |8.85 – 5.06| / 5.06 × 100
Percentage error = 3.79 / 5.06 × 100
Percentage error = 74.9%
100. The compound Na FCN).NOJ is known as
Answer:
Na=sodium FCN=Cyanogon Flouride. NOJ =DEOXYNOJIRIMYCIN/MORANOLINE
According to the ideal gas law, what happens to the volume of a gas when the pressure doubles (all else held constant)?
A multi-nutrient fertilizer contains several different nitrogen containing compounds. The fertilizer is 53.2% CH4N2O (urea), 24.1% KNO3 , and 11.8% (NH4)2HPO4 by mass. The remainder of the fertilizer consists of substances that do not contain nitrogen. How much fertilizer should someone apply to provide 2.20g N to a plant?
Answer:
7.19g of fertilizer are required to provide 2.20g of N to a plant
Explanation:
In 100g of fertilizer, the amount of nitrogen could be obtained as follows using the ratio of molar mass of nitrogen*atoms of nitrongen / molar mass of the molecule:
CH4N2O = 53.2g * (14g/mol*2 / 60.06g/mol) = 24.8gN
KNO3 = 24.1g * (14g/mol*1 / 101.10g/mol) = 3.3g N
(NH4)2HPO4 = 11.8g * (14g/mol*2 / 132.06g/mol) = 2.5g N
The mass of nitrogen in 100g of fertilizer is 24.8g + 3.3g + 2.5g = 30.6g N
That is: 30.6g N / 100g of fertilizer.
To obtain 2.20g of nitrogen are required:
2.20g N * (100g Fertilizer / 30.6g N) =
7.19g of fertilizer are required to provide 2.20g of N to a plantDiscuss why it is not necessary to know exactly how much salt was added to the water in making the salt solution to just float the egg?
Answer and Explanation:
It is not necessary to know the amount of salt in the aqua, because we know that the presence of salt in the water will increase its density.
In this case, salt increases the mass of the water, without increasing the volume of water. as the egg will not change in volume or water, we know that the density of the egg will be constant, while the change in the mass of the water with the addition of salt, will change the density of the water which will increase progressively until it becomes denser than the egg and, consequently, it will not let the egg sink.
most ponds contain both slat water and fresh water. true or false
Answer:
False
Explanation:
Freshwater habitats include ponds, lakes, rivers, and streams, while marine habitats include the ocean and salty seas.
Help! I’ll give brainliest if u get it right!
Answer:
That is the Atomic mass
Explanation:
The element symbol is S, Element name is sulfur, and
Atomic number is 16
Given the following:
Measurement Reaction 1 (Mg + HCl)
Mass of HCl (g) 100.50
Mass of solid (g) 0.20
Total mass of reactants, m (g) (add the masses above) 100.70
Initial Temperature (°C) 22.5
Temperature furthest from initial temperature(°C) 31.3
∆T(°C) Subtract the two temperatures above) 8.8
Given Reaction 1: Mg(s) + 2HCl(aq) ⟶ MgCl2(aq) + H2(g)
What is the ∆H (kJ/mol)?
Answer:
∆H = - 450 kJ/mol
Explanation:
You can calculate the change in enthalpy provided we have the heat of solution (q). That would be the only approach to this problem. But this approach is only possible if we have a specific set-up; we would have to use a calorimeter. So then the reactants are taken as the system, and water as the surroundings. When calculating q, the heat of the solution, we take 4.18. Remember that heat is flowing from the reaction mixture, to the water, from the system to surroundings, so it's exothermic and ∆H = negative:
Explain why the phosphorolytic cleavage of glycogen is more energetically advantageous than its hydrolytic cleavage.
Answer:
See explanation
Explanation:
Basically, phosphorolysis involves the cleavage of a bond by adding phosphoric acid across the bond, while hydrolysis involves the cleavage of a bond by adding water across the bond.
The phosphorolytic cleavage of glycogen is energetically advantageous because the released sugar is already phosphorylated. In contrast, a hydrolytic cleavage would yield glucose, which would then have to be phosphorylated at the expense of the hydrolysis of a molecule of ATP to enter the glycolytic pathway(Biochemistry, 5th ed, Jeremy M Berg et al, 2002).
Consider the following elementary reaction:
N2O(g) N2(g) O(g)
Suppose we let stand for the rate constant of this reaction, and stand for the rate constant of the reverse reaction. Write an expression that gives the equilibrium concentration of in terms of O and the equilibrium concentrations of N20 and N2.
Explanation:
The equation is given as;
N2O(g) ⇄ N2(g) + O(g)
k₁ = Forward reaction
k₋₁ = Reverse Reaction
Equilibrium concentration (K) = k₁ / k₋₁
[tex]K = \frac{[N2O] }{[N2] [ O]}[/tex]
what amount of heat, in KJ, would be involved in condensing 12.9 g of ch3OH ?(hvap=38.0 kj/mol
Answer:
[tex]Q=-15.3kJ[/tex]
Explanation:
Hello!
In this case, since the enthalpy of vaporization is the contrary of the enthalpy of condensation, we have:
[tex]\Delta _{cond}H=-\Delta _{vap}H=-38.0kJ/mol[/tex]
Now, we convert the grams of CH3OH to moles:
[tex]n=12.9g*\frac{1mol}{32.05g}=0.402mol[/tex]
Thus, we compute the energy as shown below:
[tex]Q=n*\Delta _{cond}H=0.402mol*-38.0\frac{kJ}{mol}\\\\Q=-15.3kJ[/tex]
Which means 15.3 kJ of energy must be back down from the system.
Best regards!
Enthalpy is the measure of the energy that is not available to work. 15.27 kJ of energy is needed to condence 12.9 g of methenol.
Enthalpy:
It is the measure of the energy that is not available to work. It is denoted by [tex]\bold{ \Delta H}[/tex].
The energy of a system can be calculated by the formula,
[tex]\bold{Q = n \times \Delta H}[/tex]
Where,
Q - energy( in kJ)
n - Number of moles
[tex]\bold{ \Delta H}[/tex] - enthalpy
Given here,
[tex]\bold{CH_3OH = 12.9 g}[/tex]
[tex]\bold{\Delta Hvap = 38.1 kJ/mol}[/tex]
molar mass of the [tex]\bold{CH_3OH}[/tex] -
The number of moles of [tex]\bold{CH_3OH}[/tex]
[tex]\bold{n = \frac{w}{m}}\\\\\bold{n = \frac{12.9}{32.03}} \\\\\bold{n = 0.402}[/tex]
Put the values in the formula,
[tex]\bold{Q = 0.402\times 38.0}\\\\\bold{Q =15.27 }[/tex]
Therefore, the 15.27 kJ of energy is needed to condense 12.9 g of methenol.
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how can i balance Na + Ca2+ --> Ca + Na+
Answer:
[tex]2Na + Ca^{2+} \rightarrow Ca + 2Na^+[/tex]
Explanation:
Hello!
In this case, since this a reaction in which the oxidation state of the metals is changing, we need to apply a redox method for which:
[tex]Na\rightarrow Na^++e^-\\\\Ca^{2+}\rightarrow Ca+2e^-\\\\\\2Na\rightarrow 2Na^++2e^-\\\\Ca^{2+}\rightarrow Ca+2e^-[/tex]
Thus, the result is:
[tex]2Na + Ca^{2+} \rightarrow Ca + 2Na^+[/tex]
Regards!
escape room ocean and air currents. Escape room
Answer:
1683
Explanation:
i did that game a few weeks ago preeeettyyyyyyyy sure that's the right number
who is the father of phycis
Galileo Galilei
hope it helps you
Answer:
Galileo Galilei is the father of Physics
I hope it helps ❤❤
when you hear organic what does it mean?
Answer:
The word “organic” refers to how a food is grown. ... However, without preservatives and fewer chemicals than regular produce, you might notice that organic foods taste fresher.
Answer:
The phrase hear, hear seems to have come into existence as an abbreviation of the phrase hear him, hear him, which was well-established in Parliament in the late seventeenth century. ... When you say hear, hear, you are in fact saying that you agree with something another person has just said.
Explanation:
hope it's help you
what do you mean by PCM
Answer:
Pulse-code modulation
Explanation:
help po
what is ecosystem?
what is a rainforest?
what are the major parts of rainforest?
what are coral reefs?
what are the different types of coral reefs?
Answer:
ecosystem:a biological community of interacting organisms and their physical environment.
rainforest: a luxuriant, dense forest rich in biodiversity, found typically in tropical areas with consistently heavy rainfall.
major part of rain forest:Most rainforests are structured in four layers: emergent, canopy, understory, and forest floor. Each layer has unique characteristics based on differing levels of water, sunlight, and air circulation.
coral reefs :a ridge of rock in the sea formed by the growth and deposit of coral.
type of coral reefs:fringing reefs, barrier reefs, atolls, and patch reefs
Explanation:
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Explanation:
1)An ecosystem is a community of living organisms in conjunction with the nonliving components of their environment, interacting as a system. These biotic and abiotic components are linked together through nutrient cycles and energy flows.2)Rainforests are forests characterized by high and continuous rainfall, with annual rainfall in the case of tropical rainforests between 2.5 and 4.5 metres and definitions varying by region for temperate rainforests3) Most rainforests are structured in four layers: emergent, canopy, understory, and forest floor. Each layer has unique characteristics based on differing levels of water, sunlight, and air circulation.4) A coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed of colonies of coral polyps held together by calcium carbonate. ... They are most commonly found at shallow depths in tropical waters, but deep water and cold water coral reefs exist on smaller scales in other areas.5)The three main types of coral reefs are fringing, barrier, and atollHope it help fulClassify each of the following as an example of a mandatory, discretionary, or originator controlled policy, or a combination thereof. Justify your answers.
a. The file access control mechanisms of the UNIX operating system
b. A system in which no memorandum can be distributed without the author's consent
c. A military facility in which only generals can enter a particular room
d. A university registrar's office, in which a faculty member can see the grades of a particular student provided that the student has given written permission for the faculty member to see them.
Answer:
Classifications according to mandatory, discretionary, or originator controlled policy, or a combination thereof:
a. Mandatory
b. Originator
c. Discretionary
d. Mandatory and Originator combined
Explanation:
a) Mandatory control means that access to the UNIX operating system is restricted.
b) Originator controlled policy implies that the memorandum cannot be distributed without the author's consent or permission.
c) Discretionary means that only certain authorized users, for example, generals, can access the particular room.
d) Combined Mandatory and Originator means that while access is restricted to some people, the originator's consent is still required before access can be granted to the faculty member.
What type of reaction
the following chemical reaction?
2C2H4O2 → C4H6O3 + H2O
energy is the sum of kinetic energy + potential energy.
(10 Points)
*
Chemical
Electrical
Mechanical
Radiant
Answer:
electrical
Explanation:
they are working together
Radiation is different than the other types of heat transfer because
Explanation:
Heat transfer by radiation tends to be minimal in many everyday instances. This is in part, due to the 4th power exponentiation of the heat transfer equation that governs radiative heat transfer.
For instance, a bar of metal of 75 ºF will interact with your body, from a distance, when your body is at 98 ºF. But the temperature difference of 14 ºF will be so low, that it is difficult to feel or detect. However, if that bar was heated to 120º F and set close to you, you may begin to feel the heat from radiation. Then, if the bar was heated to the point that it began to glow red, several hundred degrees, not only would you feel it, but it may make you uncomfortably hot very quickly. If it was then heated to being white hot, you would almost certainly be burned by it, not by touching it, but simply by the radiative heat transfer. Again, its the 4th power exponent that really makes radiative heat transfer a powerful force when the temperature increases to a high level.
Another example from a text that I once used set an example of a person in a room with their body temperature at 98 ºF. In one case, the walls of the room surrounding the body are said to be 50º F, but in the other case, the walls are said to be 100º F. In both cases, the air in the room is said to be 75ºF. The question is asked: why is the person colder in the room with 50 ºF walls, when the air is the same temperature in both cases.
The answer is that the 100 ºF walls are acting to slightly warm the body, whereas the 50º F walls are actually taking heat away from the body by way of radiative heat transfer. You can do the equations to see exactly how much the different temperatures of the walls will effect this situation.
One final example - if you look into a thermos, you will see a highly reflective liner inside of the thermos. This is a radiant barrier, and it is put into the thermos to keep the liquid inside from losing heat by way of radiation. The reflective film will transfer back most of the heat that would otherwise be lost by radiating to the outer surface of the thermos, after which it would conduct through the side of the thermos. So a thermos provides a good example of a solution for heat transfer in the form of radiation.
1. The equation for the reaction between zinc and aqueous copper(II) sulfate is shown.
Zn + Cuso, → ZnSO, + Cu
Which statement is correct?
a. The oxidation state of the oxidising agent has changed from 0 to +2.
b. The oxidation state of the reducing agent has changed from 0 to +2.
c. The oxidation state of the reducing agent has changed from +2 to 0
d. This is not a redox reaction. The solution changes from colourless to blue.
Answer:
The oxidation state of the reducing agent has changed from 0 to +2.
Explanation:
reducing agent is anything that loses electron or gains oxygen
in this case, zinc
What a main difference between Earth and Jupiter?
A. Earth is an inner planet with a solid rock surface composition, while Jupiter is an outer planet with a gas surface composition.
B. Earth is an inner planet with a relatively long distance from the sun, while Jupiter is an outer planet with a relatively short distance from the sun.
C. Earth is an outer planet with a gas surface composition, while Jupiter is an inner planet with a solid rock surface composition.
D. Earth is an outer planet with a relatively short distance from the sun, while Jupiter is an inner planet with a long distance from the sun.
Answer: A. Earth is an inner planet with a solid rock surface composition, while Jupiter is an outer planet with a gas surface composition.
Answer: What a main difference between Earth and Jupiter?
Earth is an inner planet with a solid rock surface composition, while Jupiter is an outer planet with a gas surface composition.
Earth is an inner planet with a relatively long distance from the sun, while Jupiter is an outer planet with a relatively short distance from the sun.
Earth is an outer planet with a gas surface composition, while Jupiter is an inner planet with a solid rock surface composition.
Earth is an outer planet with a relatively short distance from the sun, while Jupiter is an inner planet with a long distance from the sun.
Explanation:
Both magnetic fields and electric fields can exert a force true or false?
Answer:
false
Explanation:
An electric field may do work on a charged particle, while a magnetic field does no work.
A gas sample is found to contain 39.10% carbon, 7.67% hydrogen, 26.11% oxygen, 16.82% phosphorus, and 10.30% fluorine. If the molecular mass is 184.1 g/mol, what is the molecular formula?
Answer:
C6H14O3F
Explanation:
The first step is to divide each compound by its molecular weight
Carbon
= 39.10/12
= 3.258
Hydrogen
= 7.67/1
= 7.67
Oxygen
= 26.11/16
= 1.63
Phosphorous
= 16.82/31
= 0.542
Flourine
= 10.30/19
= 0.542
The next step is to divide by the lowes value
3.258/0.542
= 6 mol of C
7.67/0.542
= 14 mol of H
1.63/0.542
= 3 mol of O
0.542/0.542
= 1 mol of P
0.542/0.542
= 1 mol of F
Hence the molecular formula is C6H14O3F
When the number of molecules, atoms, or ions of a particular type (here we consider H ions) is in the hundreds of millions, we can confidently speak of concentrations and analyze an average behavior.
a. True
b. False
Answer:
True.
Explanation:
When the number of molecules, atoms or ions of any element is in the hundreds of millions, we can safely speak of concentrations and analyze a standard behavior, and can even specify the different dilutions used, if there are dilutions. This allows analyzes to be clearly understood by any individual. However, it is not possible to do this if the number of molecules, atoms and ions is very small.
What mass of Iron (III) acetate will be produced when 1.50 grams of iron reacts in acetic acid?
Fe + H(C2H3O2) ® Fe(C2H3O2)3 + H2
Answer:
Fe + H(C2H3O2) ........