2)A complete desktop uses an average of 200 Watt hours (Wh). This is the sum of the average consumption per hour of the computer itself (171 W), the internet modem (10 W), the printer (5 W) and the loudspeakers (20 W). Assuming that a computer is on for eight hours a day, the annual consumption comes to 600 kWh. That corresponds to CO2 emissions of about 175 kg per year, i.e. 1.75 % of the average annual emission of a Belgian.
What is surface tension? Describe how surface tension in water is useful for plants and animals.
This is not multiple choice, I need help please :')
It is a tension created by the attraction of molecules to the surface by the molecules in a bulk of a solution.
The attraction force present between water molecules is cohesion force.
The phenomenon of surface tension provides two major characteristics to the water:
It makes the surface molecules to be held together Responsible for formation of water dropletPlants take water from soil using it's roots , and water is travelling through the xylene tissues present in a plant , so the cohesion forces present in water helps it to travel to the higher places in plants.
While in case of animals, this attraction forces increases the surface density which helps to insects to walk on to the water surface.
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Silver has the density of 9.32 g/cm^3. Find the length of one side of a 184 g silver cube. Assume now that the silver cube above was melted and reshaped into a sphere. Find the sphere’s diameter
What type of molecule is pentanal?
o a. aldehyde
o b. ester
o c. ketone
o d. alcohol
Answer:
aldehyde
Explanation:
it ends with "al" of "al"dehyde, always check the end
What mass of reactants are used
during the reaction?
Iron + Sulfur➜ Iron Sulfide
27.50 g
? g
Give your answer to the correct number of
significant figures.
(g) Iron + Sulfur
Answer:
27.50 g
Explanation:
Unless weight was somehow gained/lost during the reaction, the products should weigh as much as the reactants. Since this isn't specified the mass of the reactants should be equal to the mass of the products.
Which atomic models(Bohr, Thomson, Rutherford, Dalton) in task 1 are not supported by Thomson’s experimental evidence? For each of these models, explain the experimental results that the model would predict.
Rutherford model task 1 is not supported by Thomson’s experimental evidence.
What is an atom?
The atom consists of matter that may be split without releasing electrical charges.
It's also the smallest unit of matter with chemical element features. As a result, the atom is the fundamental unit of science.
The nuclear model of the atom was initially put out by Rutherford. His atomic model states that the majority of an atom's volume is empty,
The nucleus, which contains protons and neutrons, is located in the middle of the atom, and its electrons orbit the nucleus in well-defined paths.
If we discuss the research of some other scientists, like Dalton, Neil Bohr, and JJ Thomson, they are all mostly consistent with Rutherford's findings.
For instance, Dalton's atomic theory presupposed that all atoms are roughly the same size and that atoms interact to generate compounds.
According to Rutherford's theory, atoms have a fixed number of electrons that can be shared to create compounds.
The Bohr model, which posits that electrons orbit the nucleus in certain shells, is also consistent with Rutherford's findings, which gave rise to the idea of shells.
If we discuss Thomson's Plum Pudding Model, it describes atoms as negatively charged particles around a soup of positively charged ions. This is also consistent with Rutherford's findings, which show that positive nuclei are surrounded by negative electrons.
Although Rutherford's model was the greatest atomic model, it nevertheless drew on several earlier investigations and was therefore consistent with the outcomes of earlier models.
Hence rutherford model task 1 is not supported by Thomson’s experimental evidence.
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The energy produced by the snack in an experiment is calculated to be 41,800 J/g. What is the energy of the snack in Calories/
gram?
snack energy = [?] Cal/g or kcal/g
remember there are 4.18J per 1 calorie
The energy of the snack in calories per gram is 9983.3 Calories/gram.
What is the energy of a snack?The energy that is contained in a snack is obtained from a calorimeter when the snack is burnt in a calorimeter. The mass of the snack that is burnt is measured in terms of energy output of the calorimeter.
If 1 calorie = 4.18J
x calorie = 41,800 J
x = 41,800 J * 1 calorie/4.18J
x = 9983.3 Calories/gram
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There are 8.421 g of dry ZnSO4 and
6.579 g H₂O in the sample.
Step 2: Determine the moles of water and anhydrous compound.
Zn = 65.38 g/mol, S = 32.07 g/mol,
H = 1.01 g/mol, O = 16.00 g/mol
How many moles of ZnSO4 are present?
[?] mol ZnSO4
The number of moles of H₂O is 0.36 mol.
The number of moles of LiClO₄ is 0.0521 mol.
What are moles?Mole is an important standard unit used for the measurement of large quantities of atoms, molecules, or other particles. One mole is equal to 6.022×10²³ units.
The number of moles of a substance is calculated by:
Moles =[tex]\frac{mass}{molar \;mass}[/tex]
To find the number of moles of H₂O:
Mass of H₂O in the sample = 6.579 g
The molecular weight of H₂O = 18.02g
Moles = [tex]\frac{mass}{molar \;mass}[/tex]
Moles = [tex]\frac{6.579 g}{18.02g}[/tex]
Moles = 0.36
To find the number of moles of [tex]ZnSO_4[/tex]:
Mass of [tex]ZnSO_4[/tex] in the sample = 8.421 g
The molecular weight of [tex]ZnSO_4[/tex]= 161.47 g/mol
Moles =[tex]\frac{mass}{molar \;mass}[/tex]
Moles = [tex]\frac{8.421 g}{161.47 g/mol}[/tex]
Moles = 0.0521 moles
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Why did mendeleev leave blank spaces in his version of the periodic table?.
Explanation:
Answer:
Mendeleev left blank spaces in his version of the periodic table because he left the gaps to place elements not known at the time
Consider the compound calcium nitrate, Ca(NO3)2. Which statements are true about this compound? Check all that apply. There are two atoms of oxygen. There are six atoms of oxygen. There are two nitrogen atoms. There are two calcium atoms.
Calcium nitrate is made up of 6 oxygen atoms, 2 nitrogen atoms and one calcium atom.
Ca(NO₃)₂
Calcium nitrate is a compound consisting of calcium, nitrogen and oxygen compoundsIt is an inorganic compoundIt is water-absorbent and absorbs moisture from airCalcium nitrate has two forms, hydrous and anhydrousBoth forms are colourless and odourlessThe reaction to form Calcium nitrate is Ca + 2NO₃ -----> Ca(NO₃)₂The number of oxygen atoms is: 2x3 = 6The number of nitrogen atoms is: 2x1= 1There is 1 calcium atomThus, calcium nitrate is made up of 6 oxygen atoms, 2 nitrogen atoms and one calcium atom.
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Answer:
B)There are six atoms of oxygen.
C)There are two nitrogen atoms.
Explanation:
edge 2023
Calculate the percent covalent character of a chemical bond between iodine and lithium.
Answer:
27966692
Explanation:
I don't know if this is right or not
How many grams of
diphosphorus trioxide, P2O3, are
required to react completely with
2.25 moles H₂O?
P2O3 + 3H₂O → 2H3PO3
[?] g P₂03
From the coefficients of the equation, we know that for every 3 moles of water consumed, 1 mole of diphosphorus trioxide is consumed.
This means we need to find the mass of 0.75 moles of diphosphorus trioxide.
The atomic mass of phosphorous is 30.973761998 g/mol.The atomic mass of oxygen is 15.9994 g/mol.So, the formula mass of diphosphorus trioxide is:
2(30.973761998)+3(15.9994)=109.945723996 g/mol.Thus, 0.75 moles have a mass of:
0.75(109.945723996), which is about 82.5 g (to 3 sf)the physical matter of which living or non living things are composed is called a
The physical matter of which living or non living things are composed is called a molecule
What is a molecule?A molecule is the smallest particle of an element or a compound which can normally exist alone and still retain the properties of that substance.
A molecule could be made up of an atom of an element of different atoms of elements such as:
HydrogenOxygenCarbonSodiumPotassiumMagnesiumSo therefore, the physical matter of which living or non living things are composed is called a molecule.
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if i poured green solution into another test tube and added some copper pieces to the solution will a displacment action occur
Depends on what kind of ions are present in the green solution
Explanation:
Cr3+, a famous green ion can obviously be displayed by a Cu2+ ion
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There are two common oxides of copper; one is 80% copper and the other is 89% copper by weight. Calculate the formula and name each compound.
80% copper (Cu)
Cu: 80 : 63.546 = 1.259
O: 20 : 16 = 1.25
Cu:O = 1 : 1
the formula: CuO
89% copper (Cu)
Cu: 89 : 63.546 = 1.4
O: 11 : 16 = 0.6875
Cu:O = 2:1
the formula: Cu₂O
Help me please, is for my finals!!
Answer: A
Explanation:
9 protons correspond to fluorine.
The first model shows 9 electrons, so the charge is neutral and is thus a fluorine atom.The second model shows 10 electrons, so the charge is -1, meaning is a fluoride ion.Look at pic and help
Answer:
Answer
Explanation:
1) Other gasses / or argon (based on what u took in ur school )
2) oxygen
3? Nitrogen
Answer:
By volume, the dry air (which i'm assuming that's what either the blue or red is) in Earth's atmosphere is about 78.09 percent nitrogen, and 0.93 percent argon (which might be what red is (if the red isn't dry air)). A brew of trace gases accounts for the other 0.03 percent (which I think that might be the yellow), including the greenhouse gases carbon dioxide, methane, nitrous oxide and ozone.
Explanation:
what is the approximate partial pressure of oxygen at 1500 m?
The approximate partial pressure of oxygen at 1500 m is 0.18 atm.
Pressure of the airFrom barometric pressure table;
1500 m = 85 kPa
1 kPa = 0.0099 atm
85 kPa = ?
= 0.84 atm
Oxygen percentage in air = 21%
Partial pressure of oxygen in air
P = 0.21 x P(total)
P = 0.21 x 0.84 atm
P = 0.18 atm
Thus, the approximate partial pressure of oxygen at 1500 m is 0.18 atm.
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A scientist measures the standard enthalpy change for the following reaction to be -139.5 kj :
h2(g) + c2h4(g)c2h6(g)
based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of c2h4(g) is _____ kj/mol.
Answer:
A scientist measures the standard enthalpy change for the following reaction to be -139.5 kj :
h2(g) + c2h4(g)c2h6(g)
based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of c2h4(g) is _____ kj/mol
Explanation:
Hydrogen ΔHof (kJ/mol) ΔGof (kJ/mol) So (J/mol K)
H2 (g)
0
0
130.7
Carbon ΔHof (kJ/mol) ΔGof (kJ/mol) So (J/mol K)
C2H6 (g)
-84.7
-32.8
229.6
the aria ""batter my heart"" from doctor atomic has musical influences from which era?
The aria ""batter my heart"" from doctor atomic has musical influences from the era of Renaissance.
Why is batter my heart attributed to to Renaissance era?The Renaissance era can be regarded as the era around 14th century and batter my heart was produced around the 13/14th century.
The batter my heart was among the Sicilian school of court poets, that was very famous which emphasizing the importance of the heart.
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PLEASE HELP FAST! How many grams of NO are formed if 8.3 g of ammonia react with 11.8 g of oxygen? The reaction is 4NH3 + 5O2 --> 4NO + 6H2O.
Options:
A. 8.85 g NO
B. 12.6 g NO
C. 14.6 g NO
D. 9.3 g NO
The mass of NO produced is 9.3 g; option D.
What mass of NO is produced from the reaction?
The mass of nitrogen (ii) oxide, NO, produced from the reaction is determined from the mole ratio of the reaction.
The mole ratio of ammonia to oxygen from the equation of the reaction is 4 : 5.
moles of oxygen = 11.8/32 = 0.368
moles of ammonia = 8.3/17 = 0.488
Oxygen is the limiting reactant.
Mass of NO produced = 0.369 * 4/5 * 30 = 9.4 g NO
In conclusion, approximately 9.3 g of NO is produced.
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The cutoff frequency for a certain element is 1.22 x 1015 Hz. What is its work function in eV?
Hint: 1 eV 1.60 x 10-19 J
=[?] eV
someone please teach me how to solve this its gonna make me cry
The work function of the metal is obtained as 5.1 eV
What is the cutoff frequency?The cutoff frequency is the frequency below which photo electric effect can not occur as electrons are not removed from the metal surface.
Now;
fo = 1.22 x 10^15 Hz
Wo = hfo
Wo = 6.6 * 10^-34 * 1.22 x 10^15
Wo = 8.1 * 10^-19 J
If 1 eV = 1.60 x 10-19 J
x eV = 8.1 * 10^-19 J
x = 8.1 * 10^-19/ 1.60 x 10-19
x = 5.1 eV
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What is a quantum of light energy called?
O A. A photon
OB. A frequency
O C. A proton
O D. An electron
Answer:
A) photon
Explanation:
hope it helps and give brainliest if its correct
Answer:
PhotonExplanation:
please mark brainliest pleaseHow many moles of LiCl will I have if I start off with .425 moles of CaC12?
Balanced
Moles of CaCl_2=0.425mol
1 mol CaCl_2 producees 1 mol LiCl
Moles of LiCl
0.425(1)0.425molesThe equation is
[tex]\\ \tt{:}\dashrightarrow LiOH+CalCl_2\longrightarrow LiCl+Ca(OH)_2[/tex]
This is balanced1mol of LiCl needs 1 mol CaCl_2
Then
0.425mol of CaCl_2 will produce 0.425mol LiCl
Plants require nitrogen fixed in compounds to grow. A higher the percentage of nitrogen results in improved plant growth. Which compound should you add to your fertilizer to get the best results.
A. N2F2
B. CON2H4
C. (NH4)2SO4
D. NH4NO3
Explanation:
c and d. I'm not sure which one is better tho
Nitrogen fixation is the part of the nitrogen cycle where the nitrogen is fixed as nitric oxide. Urea {CON₂H₄} should be added to fertilizer to get the best results. Thus, option B is correct.
What are fertilizers?Fertilizers are substances that are composed of organic and inorganic compounds that are used to provide nutrients to the plants and crops for growth, development, pest, and insect resistance.
The fertilizers mainly comprise nitrogen, potassium, and phosphorus. Urea {CON₂H₄} has the maximum concentration of nitrogen (46%) and will be the most effective.
The other compound ammonium nitrate {NH₄NO₃} contains 34%, ammonium sulfate { (NH₄)₂SO₄} which comprises 21% of nitrogen by mass, whereas N₂F₂ is not used as a fertilizer.
Therefore, option B. Urea {CON₂H₄} is best to use as fertilizer.
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Mr. Auric Goldfinger, criminal mastermind, intends to smuggle several tons of gold across international borders by disguising it as lumps of iron ore. He commands his engineer minions to form the gold into little spheres with a diameter of exactly
8 cm and paint them black.
However, his chief engineer points out that customs officials will surely notice the unusual weight of the "iron ore" if the balls are made of solid gold (density
). She suggests forming the gold into hollow balls instead , so that the fake "iron ore" has the same density as real iron ore
One of the balls of fake "iron ore," sliced in half.
Calculate the required thickness of the walls of each hollow lump of "iron ore." Be sure your answer has a unit symbol, if necessary, and round it to 2
significant digits.
The thickness of the walls of each hollow lump of iron ore is: 0.295cm. This is determined using the knowledge of the Volume of a Hollow Sphere.
What is the Volume of a Hollow Sphere?
The formula for the Volume of a Hollow Sphere is give as:
Volume of a Hollow = 4/3 R³ – 4/3 r³
Step 1 - Find the apparent volume of 8cm diameter sphere including the wall the the hollow inside
V = 4/3 r³
V = (4/3) (8)³
V = (4/3) * (22/7) * 512
V = 2145.52cm³
Step 2 - Determine the mass of Gold required for the sphere to achieve the density of iron ore if the apparent volume is as given in Step 1 above.
Recall that Mass = Density * Volume
Mass = 5.15 * 2145.52
Mass = 11049.45
Step 3 - Find volume of gold based on mass calculated in Step 2 above
Recall that :
Volume = Mass/Density
Thus,
V = 11049.4/19.3
Thus, Volume = 572.51cm³
Step 4 - Find the width of the wall of a hollow sphere for the volume realized in step 3
Recall the initial formula:
Volume of a Hollow = 4/3 R³ – 4/3 r³
Thus, 572.51 = (4/3) (8³ - (8 - t)³)
572.51 = (4/3) *(22.7) *(8³ - (8 - t)³)
572.51 = (88/21) *(8³ - (8 - t)³)
Multiply both sides by 21 and we have
88 (512 - (8 - t)³) = 12,022.71
Simplify further
(8 - t)³ = 357.38
t = 0.9035cm
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Up late, a tired engineer calculated the molar mass of nitroglycerin (C3H5N3O9) to be 193.7 g/mol, but this incorrect. What is the percent error of this incorrect molar mass
So, the formula mass of nitroglycerin is[tex]3(12.011)+5(1.00794)+3(14.0007)+9(15.9994)=227.0694 \text{ g/mol}}[/tex]
Therefore, the percent error is
[tex]\frac{193.7-227.0694}{227.0694} \times 100=\boxed{-14.70 \% \text{ (to 4 sf)}}[/tex]
The liquids having same boiling point cannot be seperated from its mixture by distillation, why?
Answer:
Explanation:
They cannot be separated by distillation since it depends on a liquid's ability to boil at a certain temperature. If you have two liquids with the same boiling temperatures, the proportion of each in the vapor phase will be about equal, making it impossible to separate them. Although they presumably do not have the same freezing point, you might use a different method like chromatography or work with their freezing points instead. You could then selectively crystallize one component while leaving the other as a pure liquid.
____________
Definitions:
Distillation:
#1: The volatilization or evaporation and subsequent condensation of a liquid, as when water is boiled in a retort and then the steam is condensed in a cool receiver.
Answer:
Because different compounds often have different boiling points, the components often separate from a mixture when the mixture is distilled. The boiling point is the temperature at which the vapor pressure of the liquid phase of a compound equals the external pressure acting on the surface of the liquid.
Explanation:
. What is the relationship between the speed of impact and the dropping height?
The relation between the speed of impact and the dropping height is
[tex]\rm h =\dfrac{1}{2g}v^2[/tex]
What is Speed of Impact ?It is defined as the speed of an object when it falls from a height and makes an impact with the ground or any other object.
As the object is falling from the height , its velocity will be continuously changing
Assuming it has no initial velocity , u = 0
let the final velocity is [tex]\rm v_f[/tex] = [tex]\rm \sqrt {2gh}[/tex]
the potential energy at the height h as mgh
the kinetic energy when it reaches the bottom as [tex]\rm \dfrac{1}{2}mv^2[/tex]
As the energy is always conserved
[tex]\rm mgh = \dfrac{1}{2}mv^2[/tex]
[tex]\rm h =\dfrac{1}{2g}v^2[/tex]
This is the relation between the speed of impact and the dropping height.
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A 5 Complete the sentences using words from the list. You may use them once, more than once, or not at all.
increases；decreases；stays the same
a) When liquid water boils, the distance between the particles ____
b) When liquid water boils, the strength of the attractive forces between the particles ___
c) When steam condenses, the speed of movement of the particles ___
Answer
Number 1. increase
number 2 . decrease
number 3. decrease
Explain the large variation in boiling temperatures, given the small range in Me values.
Answer:
32.0 is the answer which is divide able to 65 or -85
