Solve and use correct sig figs AND units: (Example of how to type: 3.26 m2)
The density of mercury is 13.6 g/mL. What is the mass of 3,426 mL of mercury?
Answer:
m = 46593.6 g
Explanation:
Given data:
Mass of mercury = ?
Volume of mercury = 3426 mL
Density of mercury = 13.6 g/mL
Solution:
Formula:
d = m/v
d = density
m = mass
v = volume
by putting values,
13.6 g/mL = m/ 3426 mL
m = 13.6 g/mL × 3426 mL
m = 46593.6 g
The ions S-2, Cl-1, K+, Ca+2, Sc+3 have the same total number of electrons as the noble gas argon. How would you expect the radii of these ions to vary?
Answer:
Cl^- <S^2-<Sc^3+ <Ca^2+<K^+
Explanation:
We know that ionic radius of ions decreases from right to left in the periodic table. This is because, ionic radii decreases with increase in nuclear charge. This explains why; Sc^3+ <Ca^2+<K^+.
Secondly, even though Cl^- is isoelectronic with S^2-, the size of the nuclear charge in Cl^- is larger compared to that of S^2- . Hence Cl^- is smaller than S^2- in ionic radius owing to increased nuclear attraction in Cl^-.
Given the following reaction, how many liters of H2 gas are needed to form 35.5 grams of NH3?
N2 + 3H2 -> 2NH3
Answer:
170.4L
Explanation:
The reaction equation is given as:
N₂ + 3H₂ → 2NH₃
Mass of NH₃ = 35.5g
Problem:
How many liters of H₂ are needed to produce 35.5g of NH₃
Solution:
To solve this problem, let us find the number of moles of NH₃;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of NH₃ = 14 + 3(1) = 17g/mol
So;
Number of moles = [tex]\frac{35.5}{17}[/tex] = 5.07mole
From the balanced reaction equation:
2 mole of NH₃ will be produced from 3 mole of H₂
5.07mole of NH₃ will produce [tex]\frac{5.07 x 3}{2}[/tex] = 7.61mole of H₂
At STP;
1 mole of gas will occupy 22.4L
7.61 mole of H₂ will occupy 7.61 x 22.4 = 170.4L
The general area of the atom (outside the nucleus) where the e- are located is the — and —
If something is up higher it will have ________________ potential energy.
the same
more
less
Answer:
More
Explanation:
2. The atomic number of an atom comes from *
The number of electrons.
The number of neutrons.
The number of protons.
Its atomic mass.
Assume that a 100-base pair DNA double helix contains 45 cytosine bases. Use logical thinking to figure out how many adenine bases there will be. Explain how you know.
Answer:
You will not be allowed to have any learning aids while taking a test or ... A DNA molecule consists of three parts—a nitrogen base, ... There are four DNA nucleotides, each with one of the four nitrogen bases (adenine, thymine, cytosine, and guanine). The DNA forms a two-stranded spiral, or double helix.
Explanation:
hope this helps ✌️
What is a part's structure related to?
How many grams of MgO are in 3.500 moles?
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, lead has the highest mass. 141.05gram of MgO are in 3.500 moles.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. 141.05gram is the mass of MgO.
Mathematically, the molar mass, mole and given mass can be related as
Mole of MgO =given mass of MgO ÷ molar mass of MgO
Molar mass of MgO= 40.30 g/mol
Mole of MgO= 3.500 moles
substituting the values, we get
3.500 moles = mass of MgO÷ 40.30 g/mol
Mass of MgO=141.05gram
Therefore, 141.05gram of MgO are in 3.500 moles.
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Democritius thought that
are the smallest particles of matter.
Please give 1 answer.
A.
Electrons
B.
Protons
C.
Neutrons
D.
Atoms
Someone help me answer this please! I’ll mark you brainliest
b. increase in surface area
Further explanationGiven
Speeding up a chemical reaction
Required
Factors used to speed up reactions
Solution
There are several factors that influence reaction kinetics :
1. Concentration
2. Surface area
3. Temperature
4. Catalyst
5. Pressure
6. Stirring
Temperature is related to the kinetic energy of the particles. Heat is absorbed causes the particles of matter to move faster so that the reaction can take place faster
The enlarged surface area of the reactants causes more particles to react with other particles.
50 g square block of sulfur can be broken into small pieces or powdered so that more particles come into contact with each other
how many atoms are in 0.340 moles of sodium
The number of atoms that are in 0.340 moles of sodium is 2.047×10²³ atoms.
What is Avogadro's number?Avogadro's number is equal to 6.022×10²³ which gives idea about the number of atoms present in one mole of any substance.
i.e. In 1 mole = 6.022×10²³ atoms
Given moles of sodium = 0.34 mol
Number of atoms of sodium in given moles will be calculated as:
No. of Na atoms = 0.34mol × 6.022×10²³ atoms/mol = 2.047×10²³ atoms
Hence required number of atoms are 2.047×10²³ atoms.
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(60 points + brain list)
Which is the configuration of an atom in the ground state?
A)
2-8-2
B)
2-6-1
C)
2-7-2
D)
2-7-3
Answer:
Ground state means when n = 1
and here the electronic configuration is 2:8:2
A crystal of quartz may be part of granite, sandstone, and the
metamorphic rock quartzite. Identify how that same crystal could be
found in all three rocks at different times.
HELP ME WITH THIS QUESTION
--What do you have to do to the coefficients of equation I below to get to equation II?
i) 2 [tex]SnO_{2}[/tex] + 4 [tex]H_{2}[/tex] --> 2 Sn + 4 [tex]H_{2} O[/tex]
ii) [tex]SnO_{2}[/tex] + 2 [tex]H_{2}[/tex] --> Sn + 2 [tex]H_{2} O[/tex]
--Can you divide equation II by another factor and still have it be correct? Why or why not?
--In a complete sentence, write down a method you could use to determine if an equation is written in the correct way.
Answer:
1
Explanation:
Answer:
divide all coefficients by 2.
Explanation:
How would you do this
The empirical formula = the molecular formula = C₁₀H₂₀O
Further explanationGiven
m = 0.15 g menthol
V = 0.0337 L
T = 150 +273 = 423 K
P = 100.2 kPa =0.99 atm
Required
molar mass
The molecular formula
Solution
Ideal gas law :
PV=nRT
n=PV/RT
n=0.99 x 0.0337/0.082 x 423
n=9.6 x 10⁻⁴
n = mass/Molar mass
Molar mass = mass/n
Molar mass = 0.15/9.6 x 10⁻⁴
Molar mass = 156.25 g/mol
The empirical formula of Menthol : C₁₀H₂₀O
(The empirical formula)n= molecular formula
(C₁₀H₂₀O)n=156.25
(12.011.10+1,007.20+15,999)n=156.25
(156.25)n=156.25
n=1
How is the rock in the deep mantle similar to the rock in the parts of the mantle nearest the surface? How is it different?
Answer:
Similarity: Rocks within the mantle contain more magnesium and iron than the ones in the crust.
Difference: Rocks in the deep mantle are under intense heat and pressure. In this case, they are semi-solid rocks that flow slowly. On the other hand, the part of the mantle that is nearest to the surface consists of rigid rocks. It has a lower temperature than the rocks in the deep mantle.
Explanation:
Rocks within the mantle contain more magnesium and iron than the ones in the crust.
What is Rocks?
Rocks in the deep mantle are under intense heat and pressure. In this case, they are semi-solid rocks that flow slowly.
On the other hand, the part of the mantle that is nearest to the surface consists of rigid rocks. It has a lower temperature than the rocks in the deep mantle.
According to geologists, a rock is a naturally occurring material made up of crystalline crystals of various minerals that have fused together to form a solid mass.
Therefore, Rocks within the mantle contain more magnesium and iron than the ones in the crust.
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PLEASE HELP I added some food coloring to some water. The water changed color, but
It's still the same water that I can drink. This is an example of ??
A. Chemical Change
B. Physical Change
Answer:
its definitely a physical change as the way you see it now is different then before
Answer:
b
Explanation:
because it changed colors
What number do we use to represent the connection of a solid, liquid, or solvent?
Answer:Molarity tells us the number of moles of solute in exactly one liter of a solution. (Note that molarity is spelled with an "r" and is represented by a capital M.) We need two pieces of information to calculate the molarity of a solute in a solution: The moles of solute present in the solution
Explanation:
The Missouri River is a ______ of the Mississippi River.
Answer:
The missouri River is a Longesr tributary of the Mississippi River.
The Missouri River is tributary of the Mississippi River.
What is the Missouri River?The Missouri River is known as the longest river in the United States. Missouri flows east and south for 2,341 miles before mixing with the Mississippi River north of St Louis, Missouri.
The river drains include parts of ten U.S. states and two Canadian provinces although a tributary of the Mississippi, the Missouri River is marginally longer and has a comparable volume of water. When combined with the lower Mississippi River, it creates the world's fourth-longest river system.
People depend on the Missouri River and its tributaries as a source of transportation and sustenance. The Missouri River was the main route for the westward expansion of the U.S. during the 19th century.
During the 20th century, the Missouri River was developed for irrigation, flood control, and the generation of hydroelectric power. Fifteen dams formed the stem of the river, with hundreds more on tributaries.
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Where did you walk? what did you find most enjoyable while walking: listening to music, listening to an audio book, or nothing? how did your body react to this introductory amount of exercise? was it more exercise or less exercise than you are used to? if you did not walk, what other type of physical movement did you do?
Answer: walked from school few blocks before arriving .found charting and laughing with my pals most enjoyable while I was walking .my body reacted by tiredness, it is less exercise than I am capable of doing.
Explanation: did that help?
Can someone help me on this letter E please
PLZ HELP!
How does changing the angle of a ramp affect the force required?
Answer:
depending on how you change the angle on the ramp the kanetic energy can go up or down depending on how u angle the ramp
Explanation:
1 Aluminum reacts with oxygen to produce aluminum oxide, what is the chemical equation?
Answer: Aluminum reacts with oxygen to produce aluminum oxide as follows: 4Al + 3O2 → 2Al2O3 a.
Explanation: I really really hope that was helpful.
Which statement compares the attractive forces that hold particles together?
A. Polar covalent bonds and Van der Waals forces are weakly
attractive; ionic and hydrogen bonds are strongly attractive.
B. lonic and hydrogen bonds are weakly attractive; polar covalent
bonds and Van der Waals forces are strongly attractive.
C. lonic and polar covalent bonds are weakly attractive; hydrogen
bonding and Van der Waals forces are strongly attractive.
D. Hydrogen bonding and Van der Waals forces are weakly attractive;
ionic and polar covalent bonds are strongly attractive.
Polar covalent bonds and Van der Waals forces are weakly
attractive; ionic and hydrogen bonds are strongly attractive.
What is the attractive forces that hold particles together?We usually ranked the attractive forces that hold particles together while discussing them. Ionic bonds are the strongest, followed by hydrogen bonds that are somewhat weaker than that, and finally, his disciple disciple forces that are slightly weaker still. Then, Vander Wal's forces, also known as dispersion forces, are the weakest. The first one is ionic compounds, whereas the remaining three are frequently related to molecules or covalin compounds. Consequently, when comparing these attractive forces, the most accurate statement is is one of the first polar covalin bonds to form, resulting in dipole dipole forces. Let's call them polar covalin bonds, then. Van der Waals forces and polar covalin bonds are appealing on a weekly basis; these are the weakest.To learn more about attractive forces refer to:
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Answer:
D. Hydrogen bonding and Van der Waals forces are weakly attractive;
ionic and polar covalent bonds are strongly attractive.
Explanation:
.....
....
......
I have no idea what the answer is
ill guess c
Explanation:
g
2.1 x 10^-3 x 2 x 10^2 =
a)
4.2 x 10^-5
b)
4.2 x 10^-1
c)
4.2 x 10^1
d)
4.2 x 10^-6
Answer:
I believe it is B
Explanation:
hope it helps. please let me know if it's wrong
The movement of blood from your lungs to your heart is ______.
A. picks up nutrients, water, and waste materials
B. pulmonary circulation
C. the lungs, where it picks up oxygen again
D. capillaries
E. 5
F. systemic circulation
Answer:
B. Pulmonary Circulation
Explanation:
Pulmonary circulation moves blood between the heart and the lungs. It transports deoxygenated blood to the lungs to absorb oxygen and release carbon dioxide. The oxygenated blood then flows back to the heart.
What element is the least reactive: Si
or Ba?
Answer:
Noble gases are the least reactive of all known elements. That's because with eight valence electrons, their outer energy levels are full.
Elements: Argon
please help me, please
Answer: NaCl and H2O
Explanation: Products are on the right side of the arrow :)
Answer:
B. NaCI
D. H2O
Explanation:
The product is the result, which in this case is sodium chloride and water.
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