Answer:
V = 34430 mL
Explanation:
Given data:
Volume in mL = ?
Number of moles of gas = 2.00 mol
Temperature = 36°C (36+273= 309K)
Pressure of gas = 1120 torr
Solution:
Formula:
PV = nRT
V = nRT/P
V = 2.00 mol ×62.4 torr • L/mol · K × 309K / 1120 torr
V = 38563.2 torr • L / 1120 torr
V = 34.43 L
L to mL
34.43 L ×1000 mL / 1 L
34430 mL
You are given a glass rod that is negatively charged and a pinwheel that has a negative charge. What will happen when the glass rod is brought close to the pinwheel? Why?
Answer:
they will repel each other
Explanation:
When these two are brought close to one another they will repel each other. This is similar to what happens with magnets, when two objects share the same polarity one object will create a repulsive force upon the second object and push it away. This repellent force is caused by an electric field from the same charged electrons in the atoms of the object. Since in this case both the glass rod and the pinwheel have a negative charge they will repel each other when they come into proximity of one another.
Chocolate drink can easily be dissolved in
Answer:
Chocolate drink can easily be dissolved in Hot water than cold water.
Explanation:
Chocolate drink can easily be dissolved in Hot water than cold water because hot water has more heat or thermal energy than cold water. When water is heated and becomes hot, the molecule of water gain alot of energy and this make it to move very fast and as these molecules move faster, they begin to come in contact with the molecules of chocolate drink, thereby making it to dissolve faster than that of cold water.
What is the mass of 6.2x 1022 molecules of carbon monoxide?
Answer:
Mass = 2.8 g
Explanation:
Given data:
Number of molecules of CO = 6.2×10²²
Mass of CO = ?
Solution:
We will use Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
For given 6.2×10²² molecules of CO mass will be,
1 mole = 6.022 × 10²³ molecules of CO
6.2×10²² molecule × 1 mole/ 6.022 × 10²³ molecules of CO
0.1 mol
Mass of CO:
Mass = number of moles × molar mass
Mass = 0.1 mol × 28 g/mol
Mass = 2.8 g
Describe the electronic structure of halogen how it changeS down the group
Calculate the number of moles in 144 g of P. Please show your work to receive credit.
Answer:
144 g of phosphorus contain 4.65 moles.
Explanation:
Given data:
Mass of phosphorus (P) = 144 g
Number of moles = ?
Solution:
Formula:
Number of moles = mass/ molar mass
Molar mass of phosphorus is 31 g/mol
Now we will put the values in formula.
Number of moles = 144 g/ 31 g/mol
Number of moles = 4.65 mol
Thus, 144 g of phosphorus contain 4.65 moles.
how are heavy elements such as carbon, oxygen,and neon formed during star formation?
Answer:
Neutron star collisions
Giant kelp has gas-filled sacs to help it float so it can do what?
collect more sunlight
send signals to other plants
trap small fish
move with the ocean waves
Answer:
collect more sunlight
Answer:
to collect more sunlight
Explanation:
I
go to CALIFORNIA VIRTUAL ACADEMY ONLINE SCHOOL WITH K12
Which feature is used to classify a rock based on its composition?
the origin of the rock
the texture of the rock
the types of minerals in the rock
the shapes of the crystals in the rock
Answer:
the types of minerals in the rock
Answer:
C
Explanation: I took the test and got it right (first person is right)
Which of the following is an example of physical change?
Answer:
The glass cup falling from the counter
Explanation:
the glass isn't changing in any chemical way. it's still made of the same material, just broken apart.
50 POINTS! PLEASE HELP!A gas in a balloon at constant pressure has a volume of 120.0mL at -12.30C. What is its volume at 197.00C?
Answer:
Final volume=V₂ = 216.3 mL
Explanation:
Given data:
Initial volume = 120.0 mL
Initial temperature = -12.3 °C (-12.3 +273 = 260.7 K)
Final volume = ?
Final temperature = 197.0 °C (197+273 = 470 K)
Solution:
We will apply Charles Law to solve the problem.
According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.
Mathematical expression:
V₁/T₁ = V₂/T₂
V₁ = Initial volume
T₁ = Initial temperature
V₂ = Final volume
T₂ = Final temperature
Now we will put the values in formula.
V₁/T₁ = V₂/T₂
V₂ = V₁T₂/T₁
V₂ = 120 mL × 470 K /260.7K
V₂ = 56400 mL.K /260.7K
V₂ = 216.3 mL
stions and Problems What is the freezing point of Salol?
Answer:
106.7 degrees f
Explanation:
When a sodium chloride (NaCl) solution is given to some intravenously (as an IV directly into the blood), it is usually a 0.9% NaCl solution. The reason is that a 0.9% NaCl is isotonic to your red blood cells. Use that information to answer the following questions: In the solution above, which molecule is acting as the solute and which molecule is acting as the solvent? If you replaced the 0.9% NaCl solution with pure water instead, would the water be hypertonic, hypotonic, or isotonic to your red blood cells? If you replaced the 0.9% NaCl solution with pure water instead, would the net (overall) movement of water be into the cell, out of the cell, or would there be no net movement of water? If you replaced the 0.9% NaCl solution with pure water instead and waited, what specifically would happen to your red blood cells?
Answer:
Explanation:
(1) In the IV solution, the solute here is the NaCl salt and the solvent is the liquid (water) the salt is dissolved in.
(2) If the NaCl is replace with water, the water content will become hypotonic to the red blood cells as there would be less solute in the solution than in the cell's cytosol. This also means there is more water in the solution than in the cell's cytosol.
(3) Because the water is hypotonic to the red blood cells (as described in (2) above), the net movement of water will be into the cell.
(4) If the movement of water is allowed to continue as described in (3) above (i.e if 0.9% NaCl in the solution is replaced with pure water instead and waited), the cell will rupture which can lead to cell lysis or cytolysis.
NOTE: An isotonic solution describes when there is the same amount of solute in the cell and the solution outside the cell hence there is little or no movement of water.
If a liquid has a pH of 7 it is what?
Answer:
Neutral
Explanation:
A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic. The pH scale is logarithmic and as a result, each whole pH value below 7 is ten times more acidic than the next higher value.
Answer:
I believe it is neutral.
Explanation:
Since higher than 7 pH is alkaline, and lower than 7 pH is acidic.
Which types of particles are charged and located within the nucleus of an atom?
a. protons and electrons
b. neutrons
c. electrons
d. protons
7. Which of the following units would be MOST appropriate for measuring
the volume of a small can of soda? *
1 point
A. Liters
B. Milliliters
C. Grams
D. Kilograms
Use the metric ruler to answer questions 8 and 9.
Answer:
im pretty sure the answer is b
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HOPE IT HELPS
PLEASE MARK ME BRAINLIEST ☺️
what is the meaning between fission and fusion
Answer:
Both are nuclear reactions that produce energy,but the applications are not the sameExplanation:
Fission -is the spitting of a heavy,unstable nucleus into two lighter nuclei Fussion -is the process where two light nuclei combine together releasing vast amounts of energy.What is the name of the molecular geometry (shape) for this Lewis structure?
Answer:
Trigonal Pyramidal
Explanation:
You have [tex]AX_3E_1[/tex] configuration which corresponds to a trigonal pyramidal structure.
Studying the solar system helps scientists learn about the universe. Why might a scientist use a model to represent the solar system? A. The actual solar system moves too slowly B. The actual solar system is too large O C. The actual solar system is too simple D. The actual solar system is too small
Answer:D- the actual solar system is too large
Explanation: just took the quiz
Answer: The actual solar system is to large.
Explanation: well it's not because its to small and definitely not because it's too simple. and because it moves slowly doesn't make sense. so its B. hope this helps :)
WHICH IS WHICH?
Directions: In the given illustrations, identify which are elements and compounds. Write
your answer in the space below the illustration.
plssss i need answers plssssssssssssss its due tmrw
Answer:
- First: element.
- Second: Compound.
- Third: element.
- Fourth: Compound.
Explanation:
Hello.
In this case, since elements are composed the same atom and compounds are composed by two different atoms, we can see that:
- First: it is an element as each sphere seems to be the same.
- Second: It is a compound as two different type of spheres are shown, white and black, considering each sphere is a different element.
- Third: it is an element because the spheres are equal, in fact, it is a diatomic element as two atoms are joined per molecule.
- Fourth: It is a compound as well since each molecule has two colored spheres and one white sphere, meaning that it has two different atoms per molecule.
Best regards.!
35 POINTS PLZ HELP FAST
Suppose a new island is discovered with previously unknown species. What lines of evidence would you look at to determine how they are related to known species.
Answer: DNA, developmental similarity, and similarities in body structure.
Answer:
the answer is
-DNA
-Development
-Similarity
-Similarities in body structure
Explanation:
I hope this helped have a good day❤
The table shows the average number of pounds of trash generated per person per day in the United States from 1970 to 2010. Use the statistics calculator to calculate the mean and median. Round the answers to the nearest hundredth.
Median =
Mean =
Answer: median :4.44 mean :4.11
Explanation:
i did test on Edge
4- Calculate the mol fraction of ethanol and water in
a sample of rectified spirit which contains 95% of
ethanol by mass.
Answer:
math si hard
Explanation:
The mole fration of ethanol and water in a sample of rectified spirit which contains 95% of ethanol by mass is 0.8 and 0.11.
How do we calculate mole fraction?Mole fraction of any substance will be calculated by dividing the moles of that substance from the total moles of the solution.
Moles (n) will be calculated as:
n = W/M, where
W = given mass
M = molar mass
Given that 95% of ethanol by mass is present in the sample, so 95g of ethanol is present in 100g of solution.
Mass of solvent (water) = 100 - 95 = 5g
Moles of water = 5g / 18g/mol = 0.27mol
Moles of ethanol = 95g / 46g/mol = 2.06mol
Mole fraction of water = 0.27 / (0.27+2.06) = 0.11
Mole fraction of ethanol = 2.06 / (0.27+2.06) = 0.8
Hence required mole fraction of water & ethanol is 00.11 and 0.8 respectively.
To know more about mole fraction, visit the below link:
https://brainly.com/question/1601411
#SPJ2
4 800 000 in scientific notation
Answer:
4.8*10^6
Explanation:
Simply count the number of decimal places moved to the left until you get 1 digit IN front of the decimal
Which atom has the largest atomic radius
4. Do you think the distribution of elements 10 billion years from now
will be different than it is today? Why or why not?
Answer:
yes
Explanation:
everything will change
Question 14
4 pts
Using the formula Na + Cl2 --> Naci, if 2.98 moles of sodium are combined with
excess" chlorine, how many moles of sodium chloride will be made? Note that in
this question, excess means extra or as much as you need.
Answer:
2.98 moles of NaCl are produced.
Explanation:
Given data:
Moles of sodium = 2.98 mol
Amount of chlorine = excess
Moles of NaCl produced = ?
Solution:
Chemical equation:
2Na + Cl₂ → 2NaCl
Now we will compare the moles of sodium chloride with only sodium because sodium is limiting reactant and chlorine is in excess thus sodium limit the yield of product.
Na : NaCl
2 : 2
2.98 : 2.98
2.98 moles of NaCl are produced.
When is the atomic number NOT equal to the number of electrons?
Explanation:
where there are negative or positive ions
Explanation:
Protons
Each element has an atomic number. The atomic numbers are listed along with the names and symbols of the elements on the inside cover of the text. The atomic number equals the charge on the nucleus. It therefore also equals the number of protons in the nucleus and also equals numerically the number of electrons in the neutral atom. The atomic number has the symbol Z.
Different elements have different atomic numbers; therefore, atoms of different elements contain different numbers of protons (and electrons). Oxygen has the atomic number 8; its atoms contain 8 protons and 8 electrons. Uranium has the atomic number 92; its atoms contain 92 protons and 92 electrons.
The relationship between atomic number and the number of protons or electrons can be stated as follows:
Atomic number= number of protons per atom= number of electrons per neutral atom
B. Mass Number Equals Protons plus Neutrons
Each atom also has a mass number, denoted by the symbol A. The mass number of an atom is equal to the number of protons plus the number of neutrons that it contains. In other words, the number of neutrons in any atom is its mass number minus its atomic number.
Number of neutrons = mass number - atomic number
or
Mass number = number of protons + number of neutrons
The atomic number and the mass number of an atom of an element can be shown by writing, in front of the symbol of the element, the mass number as a superscript and the atomic number as a subscript:
mass number
atomic numberSymbol of elementorA
ZX
For example, an atom of gold (symbol Au), with an atomic number 79 and mass number of 196 is denoted as:
196
79Au
C. Isotopes
Although all atoms of a given element must have the same atomic number, they need not all have the same mass number. For example, some atoms of carbon (atomic number 6) have a mass number of 12, others have a mass number of 13, and still others have a mass number of 14. These different kinds of the same element are called isotopes. Isotopes are atoms that have the same atomic number (and are therefore of the same element) but different mass numbers. The composition of atoms of the naturally occurring isotopes of carbon are shown in Table 4.2.
TABLE 4.2 The naturally occurring isotopes of carbonIsotopeProtonsElectronsNeutrons12
6C66613
6C66714
6C668
The various isotopes of an element can be designated by using superscripts and subscripts to show the mass number and the atomic number. They can also be identified by the name of the element with the mass number of the particular isotope. For example, as an alternative to
12
6C,13
6C,and14
6C
we can write carbon-12, carbon-13, and carbon-14.
About 350 isotopes occur naturally on Earth, and another 1500 have been produced artificially. The isotopes of a given element are by no means equally abundant. For example, 98.89% of all carbon occurring in nature is carbon-12, 1.11% is carbon-13, and only a trace is carbon-14. Some elements have only one naturally occurring isotope. Table 4.3 lists the naturally occurring isotopes of several common elements, along with their relative abundance.
TABLE 4.3 Relative abundance of naturally occurring isotopes of several elementsIsotopeAbundance (%)hydrogen-199.985hydrogen-20.015hydrogen-3tracecarbon-1298.89carbon-131.11carbon-14tracenitrogen-1499.63nitrogen-150.37 oxygen-1699.76oxygen-170.037oxygen-180.204IsotopeAbundance (%)silicon-2892.21silicon-294.70silicon-303.09chlorine-3575.53chlorine-3724.47phosphorus-31100iron-545.82iron-5696.66iron-572.19iron-580.33 aluminum-27100
How many moles are there in 50.0 mL of a 3.20 M solution? 0.00250 mol 1.65 mol 0.00675 mol 0.160 mol
0.160 mols can be found in 50.0mL of 3.20M solution
What do you think makes an atom “neutral or ion”?
Plz help, i will give five stars and brainliest!
Answer: neutral
Explanation: An atom is made up of three major sub-atomic particles namely protons, electrons and neutrons. The electrons form a cloud around the nucleus and are bound to the nucleus by electromagnetic forces.
1. An oxide of chromium is found to have the following % composition: 68.4% Cr
and 31.6% 0. Determine this compound's empirical formula.
Answer:
Empirical formula is Cr₂O₃.
Explanation:
Given data:
Percentage of Cr = 68.4%
Percentage of O = 31.6%
Empirical formula = ?
Solution:
Number of gram atoms of Cr = 68.4 / 52 = 1.3 2
Number of gram atoms of O = 31.6 / 16 = 1.98
Atomic ratio:
Cr : O
1.32/1.32 : 1.98/1.32
1 : 1.5
Cr : O = 1 : 1.5
Cr : O = 2(1 : 1.5)
Empirical formula is Cr₂O₃.
