The total weight in pounds should be listed on the billing sheet is [tex]7.5135\times 10^2 pounds[/tex].
Explanation:
Scientific notation is a way of representing a very small or a very large number or quantity in which the number is written in decimal form along with the number '10' which has some appropriate power.For example :[tex]3.45\times 10^{16}[/tex] Liters of water
[tex]4.89\times 10^{-9}[/tex]meters
Given:
Weight of sofa = 158 pounds
Weight of chair = 65.7 pounds
Weight of piano =[tex]3.8\times 10^2 pounds[/tex]
Weight of several boxes = 147.65 pounds
To find:
Total weight in pounds
Solution:
Weight of sofa = 158 pounds
Weight of chair = 65.7 pounds
Weight of piano =[tex]3.8\times 10^2 pounds=380 pounds[/tex]
Weight of several boxes = 147.65 pounds
Total weight of all the items in pounds:
[tex]=158 pounds + 65.7 pounds +380 pounds+147.65 pounds\\=751.35 pounds\\=\frac{751.35\times 10^2}{10^2}=7.5135\times 10^2 pounds[/tex]
The total weight in pounds should be listed on the billing sheet is [tex]7.5135\times 10^2 pounds[/tex].
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Which of the following processes will determine the number of atoms in a sample?
Dividing the mass of the sample by its molar mass
Multiplying the mass of the sample by its molar mass
Dividing the number of moles of the sample by Avogadro's number
Multiplying the number of moles of the sample by Avogadro's number
Answer:
Multiplying the number of moles of the sample by Avogadro's number
Explanation:
The process that will help determine the number of atoms in a sample is by multiplying the number of moles of the sample by Avogadro's number.
The number of moles of substance has a wide range of application in quantitative chemistry.
A mole of any substance contains the Avogadro's number of particles. The particles can be atoms, molecules, formula units, neutrons, protons, electrons etc.
So, when we have the number of moles of a substance, the number of atoms is obtained by multiplying with the Avogadro's constant.
4K + O2 + 2K20
Which statement is true?
Answer:
yes 4K + O2 ------>2K20 is true.
What are four similarities between mixtures and molecules?
Answer:The different substances in a mixture are not chemically combined, whereas the different elements in a compound are. The atoms do not combine in the mixture, but they combine when they form a compound.
Explanation:
Answer:
Explanation:
1. The constituents or components of a mixture and compound can easily be separated.
2. Both mixture and compound can be heterogeneous.
3. Both compound and mixture are combined in a definite ratio or in any proportion.
4. Both compound and mixture consist of two or more substances/elements.
5. Both compounds and mixtures have physical and chemical properties.
Hope it helped you.
The change in a rabbits fur color is most likely due to what
Answer:
Explanation:
Color changes are an evolutionary survival mechanism, borne of a rabbit's status as prey animals. Rabbits molt several times a year. Their fur initially grows and then grows back a different shade, camouflaging them from potential predators.
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12dm3 ethene reacts with steam to make 18.4g ethanol.find the percentage yield
% yield = 74.35
Further explanationGiven
12 dm³ ethene = 12 L
18.4 g ethanol(actual)
Required
The percentage yield
Solution
Reaction
C₂H₄(g) + H₂O(g) ⇒ C₂H₅OH(g)
Assume at STP, 1 mol gas = 22.4 L
mol ethene :
= 12 L : 22.4 L
= 0.538
From equation, mol ratio C₂H₅OH : C₂H₄ = 1 : 1, so mol C₂H₅OH = 0.538
Mass Ethanol (MW=46 g/mol) ⇒ theoretical
= 0.538 x 46
= 24.748 g
% yield = (actual/theoretical) x 100%
% yield = (18.4/24.748) x 100%
% yield = 74.35
What will happen to the temperature, as
thermal energy is added to the ice over time?
OK
Answer:
When you heat ice, its temperature rises, but as soon as the ice starts to melt, the temperature stays constant until all the ice has melted. This happens because all the heat energy goes into breaking the bonds of the ice's crystal lattice structure.
Explanation:
Shards of ice fly from the sculptor’s chisel. As the crowd
looks on, a swan slowly emerges from a massive block of ice. As
the day wears on, however, drops of water begin to fall from the
sculpture. Drip by drip, the sculpture is transformed into a puddle of liquid water. What makes matter change from one state to
another? To answer this question, you need to think about the
particles that make up matter.
Energy Simply stated, energy is the ability to do work or cause
change. The energy of motion is called kinetic energy. Particles
within matter are in constant motion. The amount of motion of
these particles depends on the kinetic energy they possess. Particles
with more kinetic energy move faster and farther apart. Particles
with less energy move more slowly and stay closer together.
The total kinetic energy of all the particles in a sample of
matter is called thermal energy. Thermal energy, an extensive
property, depends on the number of particles in a substance as
well as the amount of energy each particle has. If either the
number of particles or the amount of energy in each particle
changes, the thermal energy of the sample changes. With identically sized samples, the warmer substance has the greater thermal energy. In Figure 7, the particles of hot water from the hot
spring have more thermal energy than the particles of snow on
the surrounding ground.
The blood cells that directly attack germs are: *
Answer:
lymphocytes
Explanation:
it consists of the b and the t cells
Which of the following elements would likely be a gas at rom temperature?
A. Argon (Ar)
B. Magnesium (Mg)
C. Copper (Cu)
D. 13
Answer:
A. Argon
Explanation:
it is a gas that makes up to 1% of the atmosphere
Arnold kept a water log as a project for his chemistry class. Arnold's family consists of Arnold, his sister, and his parents for a total family size of four. He measured each family member's water usage every day for a week, and found that the family used an average of 457 gal/day. Arnold's city charges $0.223/cgal of water. The unit centigallon (cgal) is used by cities to measure the volume of water used, where 1 cgal is equal to 100 gal. Assuming this average usage continues, how much does Arnold expect his family to pay in a year for water usage?
Answer:
$ 1487.90 .
Explanation:
Family size = 4
Water usage per member = 457 gal / day .
Water usage for whole family = 457 x 4
Use of water in one year for family = 457 x 365 x 4 = 667220 gal
667220 gal = 667220 / 100 = 6672.20 cgal .
expense per cgal = $ 0.223
Total yearly expected expense = 0.223 x 6672.20
= $ 1487.90
How hot does a grill have to be if you want to properly cook Shrek meat?
what is the molar mass of Ca(OH)2
Answer:
The molar mass of Ca(OH)2 is 74.092 g/mol
Explanation:
First your going to find the atomic mass of each element on the periodic table.
Ca(Calcium) = 40.078
O(Oxygen) = 15.999
H(Hydrogen) = 1.008
Then we can create the equation:
40.078 + (15.999 + 1.008) × 2
40.078 + (17.007) × 2
40.078 + 34.014
= 74.092 g/mol
Answer:
74 gmol-1
Explanation:
Molar masses
Ca= 40
O = 16
H = 1
Molar mass of Ca(OH)2 = 40+16*2+1*2
= 40+32+2
=74
Question: Describe how thermal energy
moves in a glass of ice water
(what should i write for this?)
Answer:
Explanation: The interaction between the particles of the hot water, the metal can and the cold water results in a transfer of energy outward from the hot water to the cold water. ... The mechanism in which heat is transferred from one object to another object through particle collisions is known as conduction.
A body-centered cubic unit cell has an edge length of 588 pm. What is the radius of the atoms composing the unit cell?
Answer:
hi follow me it well help
True or false heat comes from vibrating molecules only. Helpppp
Answer:
It would be True becasuse u see, Temperature measures the average kinetic energy per molecule.
>More info if needed
When molecules vibrate, they're bumping into each other—transferring kinetic energy to other molecules, which sometimes radiate this energy as heat (on a larger scale), and thats why vibration causes heat.
Explanation:
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The statement "heat comes from vibrating molecules only" is definitely true.
How heat is produced by the vibration of molecules?Heat is significantly produced by the vibration of molecules through the process of vibration that forces the other molecules by transferring their kinetic energy to others. This step governs the radiation of energy in the form of heat.
The vibration of molecules depends on the temperature of the substance or solution. At higher temperatures, the vibration of molecules is found to be high as compared to the lower temperature. It is the key mechanism that is required for the synthesizing of heat through vibrations.
Therefore, the statement "heat comes from vibrating molecules only" is definitely true.
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A student is given a sample of an unknown solid and asked to identify it. The student begins by making a list of questions to investigate about the sample.
BRAINLY QUICK!
Which question would be the least useful in helping the student identify the sample?
A) Is the sample soluble in water?
B) What is the weight of the sample?
C) Is the sample attracted to a magnet?
D) What is the melting point of the sample?
Answer:
B) What is the weight of the sample?
Explanation:
The least useful question for the student to identify the sample is "What is the weight of the sample?"
To identify a sample, it is important to know its solubility (homogenous or heterogenous), chemical properties such as melting and boiling point, and whether sample is attracted towards the magnet or not to know the nature of the sample.
Weights is the least useful characteristic of a sample that can help to identify the sample.
Hence, the correct answer is "B) What is the weight of the sample?".
The pKa of a solution is defined by the equation pKa=-log Ka
Where Ka= acid dissociation constant.
Use the rules for logarithms and exponents to solve fo Ka in terms of pKa.
Answer:
ka = 10^-pKa
or antilog-pka
The pKa of a solution is defined by the equation pKa=-log Ka. Where Ka= acid dissociation constant. By using the rules for logarithms and exponents to solve for Ka in terms of pKa, ka = 10^-pKa or antilog -pka.
What do you mean by the term dissociation constant ?The term dissociation constant is defined as the ratio of dissociated ions to the original acid or bases in the solution. For acids, the acid dissociation constant is defined as the ratio of concentration of dissociated ions to the concentration of original acid.
The equilibrium constant is a numerical representation of an acid's strength in a solution. Ka is frequently stated in mol/L units.
To make a more administrable number, chemists define the pKa value as the negative logarithm of the Ka value as follows:
pKa = -log Ka.
Thus, By using the rules for logarithms and exponents to solve for Ka in terms of pKa, ka = 10^-pKa or antilog -pka.
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Fe2O3 + 2Al = 2Fe + Al2O3 is this a redox reaction
Answer:
2Al+ Fe2O3 gives 2Fe + Al2O3. The given reaction is a redox reaction. As oxidation and reduction are taking place simultaneously.Explanation:
like this...Identify oxidation and reduction with their agents:
•2Al+ Fe2O3 →2Fe + Al2O3•Fe2O3 is reduced to Fe whereas Al is oxidized to Al2O3In the above reaction:Oxidizing agent:Fe2O3Reducing agent:AlI hope it's help you (◠‿・)—☆
The figure below represents a reaction.What type of reaction is shown?
SO3+ H2SO4 →→ HSO4
synthesis
decomposition
single displacement
double displacement
SO₃+ H₂SO₄ → H₂SO₄ This reaction is synthesis type of reaction, because that would be combination (synthesis) A + B → AB. Therefore, option A is correct.
What are the types of reaction ?There are five basic types of chemical reactions are combination, decomposition, single-replacement, double-replacement, and combustion.
Biochemical reactions are chemical reactions that occur within living things. Metabolism refers to the sum of all biochemical reactions in an organism. Exothermic and endothermic chemical reactions are both part of metabolism.
Hydration is the process of combining water molecules with another substance to form a single, new compound. SO3 is an acidic oxide that reacts with and dissolves in water to form sulfuric acid, H2SO4.
Thus, option A is correct.
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The planets Hox and Blox are near each other in the Dorgon system. The Dorgons have very advanced technology, and a Dorgon scientist wants to increase the pull of gravity between the two planets.
Which proposals would the scientist make to accomplish this goal? Check all that apply.
Answer:
Increase the mass of the two planets
Reduce the distance between them
Explanation:
The proposal to increase the pull of gravity between the two planets can be effected by increasing the mass of the two planets and then reducing the distance between them.
Since they have an advanced technology, this is very feasible and highly possible.
We know this from the Newton's law of universal gravitation. The law states that the gravitational force of attraction between two bodies is directly proportional to the product of their masses and inversely proportional to the square of the distances between them. Therefore, to increase gravity between two bodies, increase their mass and reduce the distance between them.Answer:
decreasing the distance between Hox and Blox
increasing the mass of Hox
increasing the mass of Hox and Blox
Answer: Options A, B, and E
Examples of homogeneous mixtures
Answer:
air, saline solution, most alloys and bitumen
Explanation:
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What is the mass of 4.70 mol H2O? Answer in units of g.
Answer:
4.70 moles of water have mass of 84.6g
Explanation:
Given data:
Number of moles of water = 4.70 mol
Mass in gram = ?
Solution:
Formula:
Mass = number of moles × molar mass
Molar mass of water is 18 g/mol
Mass = 4.70 mol × 18 g/mol
Mass = 84.6 g
Thus, 4.70 moles of water have mass of 84.6g.
How many atoms of potassium, K, are in K3PO4
Answer:
1
Explanation:
Arrange the statements made during a process to correspond with the scientific method.
Answer:
The statements made during a process to correspond with the scientific method is arranged by sequence.
Explanation:
The accurate classification would be,
- You mention a sparkling silvery speck in a rock.
- The instrument presents proof that the specimen is zinc.
- You speculate the silvery speck could be gold.
- You practice an instrument to classify elements in the sparkling material.
- You presume that the material is zinc.
A cylinder has the following dimensions: radius = 3.7 cm and height = 6.5 cm. If the mass of the cylinder is 40.67 g, calculate the density in g/cm'. (V = trh) Cylinder
Answer:
49.8cm
Explanation:
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The molar masses of four unknown gases are shown in the table. Molar Mass of Unknown GasesGas Molar Mass
A 44 g/mol
B 20 g/mol
C 30 g/mol
D 32 g/mol
Which gas is likely to have the highest rate of effusion?
Answer:
Gas B
Explanation:
because it has the lowest molar mass.
Molar Mass of Unknown Gas 20 g/mol gas is likely to have the highest rate of effusion. Option B is correct.
What is rate of effusion?The rate of effusion of a an y given gas is inversely proportional to the square root of the molar weight of the gas. The lighter the weight of a gas is, the rapidly it will effuse and the heavier the weight of the gas is, the slower one limited it will show effusion.
The effusion process of a given gas is in which a gas move from a container with the source of a hole of diameter which is smaller than the mean free path of the molecules or the molecule of gasses.
Therefore, molar Mass of Unknown Gas 20 g/mol gas is likely to have the highest rate of effusion. Option B is correct.
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1. In what country did Celsius live, work and die
Answer:
Name - ANDERS CELSIUS
Born on 27 November 1701 Uppsala, Sweden
Died on 25 April 1744 (aged 42) Uppsala, Sweden
Nationality -Swedish
Alma mater - Uppsala University
Explanation:
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Which of the following bonds is the most polar?
a. Fr-F
b. H-f
c. Cl-F
d. I-f
e. F-F
function of starch solution
Answer:
Starch is a viable indicator in the titration process because it turns deep dark blue when iodine is present in a solution. When starch is heated in water, decomposition occurs and beta-amylose is produced
The decomposition of 74.2 g ammonium
nitrate yields how many liters of water a
0.954 atm and 387 K?
NH,NO3(s) → NO g) + 2H,O(g)
Note: Keep extra digits in any intermediate
calculations! Round to the correct number of
significant figures at the very end.
For R, use 0.08206 L atm/(mol K).
Answer:
61.75 L of water
Explanation:
We'll begin by calculating the number of mole in 74.2 g of ammonium nitrate, NH₄NO₃. This can be obtained as follow:
Mass of NH₄NO₃ = 74.2 g
Molar mass of NH₄NO₃ = 14 + (4×1) + 14 + (3×16)
= 14 + 4 + 14 + 48
= 80 g/mol
Mole of NH₄NO₃ =?
Mole = mass / molar mass
Mole of NH₄NO₃ = 74.2 / 80
Mole of NH₄NO₃ = 0.9275 mole
Next, the balanced equation for the reaction. This is illustrated below:
NH₄NO₃ —> N₂O + 2H₂O
From the balanced equation above,
1 mole of NH₄NO₃ decomposed to produce 2 moles of H₂O.
Therefore, 0.9275 mole of NH₄NO₃ will decompose to produce = (0.9275 × 2) = 1.855 moles of H₂O.
Finally, we shall determine the volume of water obtained from the reaction. This can be obtained as follow:
Pressure (P) = 0.954 atm
Temperature (T) = 387 K
Number of mole (n) of H₂O = 1.855 moles.
Gas constant (R) = 0.08206 L.atm/Kmol
Volume (V) of H₂O =?
PV = nRT
0.954 × V = 1.855 × 0.08206 × 387
Divide both side by 0.954
V = (1.855 × 0.08206 × 387) / 0.954
V = 61.75 L
Therefore, 61.75 L of water were obtained from the reaction.
