what is screening effect how does it relate to effective nuclear charge
____ occurs when the vapor pressure of a liquid is equal to the external atmospheric pressure.
Answer:
c
Explanation:
boiling
What is the longest compound name? How many atoms are in the compound?
Answer: its called titin, but it has a much much longer name that i couldn't find in full
Explanation: C169,719H270,466N45,688O52,238S911
WILL GIVE BRAINLIEST!!!
What is the mass of NaCl required to make 160 grams of a 32% solution of NaCl in water?
Answer:
19.20 g. Explanation: ∵ mass % = [mass of solute/mass of solution] x 100
If I have an unknown quantity of gas at a pressure of 0.72 atm, a volume of 22
liters, and a temperature of 30° C, how many moles of gas do I have?
Answer:
0.64 mol
Explanation:
Using ideal gas equation as follows;
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant (0.0821 Latm/molK)
T = temperature (K)
According to the information provided in this question;
P = 0.72atm
V = 22 L
T = 30°C = 30 + 273 = 303K
n = ?
Using PV = nRT
n = PV/RT
n = (0.72 × 22) ÷ (0.0821 × 303)
n = 15.84 ÷ 24.88
n = 0.64 mol
A farmer wants to build a pond for her cows. What step must she take in order to build the pond?
A. Dig into the zone of aeration.
B. Place a permeable material on the ground.
C. Keep the soil moist.
D. Place an impermeable material on the ground.
Answer:
Option A:
Dig into the zone of aeration
Explanation:
Within the lithosphere of the earth's surface, the zone of aeration is the zone directly above the water table, with a lot of pore spaces within the rocks. These pore spaces contain air and water, which can be used to water the cows.
Once the zone of aeration has been dug into, the farmer can tap into the underground reserve of water, which is stored within the pores of rocks. This water can now sip into the hole that was dug up by the farmer, forming a pond for the cows.
If 4.27 grams of sucrose, C12H22O11, are dissolved in 15.2 grams of water, what will be the boiling point of the resulting solution?
The elevation in temperature of water by the addition 4.27 g of sucrose to 15.2 grams is 0.42 °C. Thus the boiling point changes from 100 to 100.42 °C.
What is boiling point?Boiling point of a substance is the temperature at which the pressure of gas above the liquid phase equals the atmospheric pressure where conversion of liquid to solid takes places.
By the addition of a non-volatile solid to the solution, the boiling point increases and the increase in boiling point ΔT is proportional to the molality of the solution.
ΔT = Kb m
Where, Kb is called the ebullioscopy constant. Kb for water is 0.52 K Kg/mol.
Molar mass of sucrose = 342 g/mol
no.of moles in 4.27 grams = 4.27 /342 = 0.0124.
mass of solvent = 15.2 = 0.0015 Kg.
Molality = no/ of moles of solute/ mass of solvent in kg
= 0.015 Kg ×0.0124 mol
= 0.82 mol/Kg.
Now, the increase in temperature ΔT = 0.82 mol/Kg × 0.52 K Kg/mol.
= 0.42 °C
Thus, the new boiling point will be 100 + 0.42 °C = 100.42 °C.
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What's the number of atoms in one mole of Magnesium?
Answer:
he mass in grams of one mole of substance is called molar mass. Each element has its own unique molar mass. For example, carbons molar mass is 12.011 g/mol, and magnesium's molar mass is 24.3050 g/mol. To see why these elements have different molar masses, we need to remember that the atoms of different elements contain different numbers of protons, neutrons, and electrons, so they have different masses. The atomic masses given in the periodic table inside the front cover of this book represent the different weighted average masses of the naturally occurring atoms of each element. Different atomic masses lead to different molar masses.
For example, the atomic mass of magnesium (24.3050) shows us that the average mass of magnesium atoms is about twice the average mass of carbon atoms (12.011), so the mass of 6.022 x 1023 magnesium atoms (the number of atoms in 1 mole of magnesium) is about twice the mass of 6.022 x 1023 carbon atoms (the number of atoms in 1 mole of carbon). Thus the molar mass of magnesium is 24.3050 g/mol, compared to carbons molar mass of 12.011 g/mol.
Explanation:
Hydrogen gas and nitrogen gas come together to form ammonia. If 25.0 g of nitrogen is mixed with hydrogen, what volume of hydrogen is needed to complete the reaction? (grams to volume)
Answer:
60.0L of hydrogen are needed
Explanation:
Based on the reaction:
3H₂ + N₂ ⇄ 2NH₃
3 moles of hydrogen react 1 mole of nitrogen.
To solve this question we have to find the moles of nitrogen. With the moles of nitrogen we can find the moles of hydrogen. Using PV = nRT at STP conditions we can find the volume as follows:
Moles Nitrogen -Molar mass: 28g/mol-
25.0g N₂ * (1mol / 28g) = 0.893 moles N₂
Moles hydrogen:
0.893 moles N₂ * (3mol H₂ / 1mol N₂) = 2.679 moles H₂
Volume hydrogen:
PV = nRT
V = nRT / P
Where V is volume in liters,
n are moles of the gas: 2.679 moles
R is gas constant: 0.082atmL/molK
T is absolute temperature: 273.15K at STP
P is 1atm at STP
Replacing:
V = 2.679mol*0.082atmL/molK*273.15K / 1atm
V =
60.0L of hydrogen are needed
Which of these molecules is polar?
A.
N2
B.
NaCl
C.
HF
D.
CH4
Answer:
C
Explanation:
.........................
Put these events in order.
= Your phone contacts a base station in a cell.
= Once connected, a duplex system allows you to talk to the other person at the same time.
= You dial a number on your cell phone.
The MTSO then connects you to the other device.
= A base station contacts the Mobile Telephone Switching Office (MTSO).
Answer:
You dial a number on your phone
Your phone contacts a base station
The base station contacts the MTSO
The MTSO connects you to the other device
You talk to the person on the other device.
A container is filled completely with 197g of ethyl alcohol (density 0.790g/cm3). What is the volume of the container?
Answer:
The volume of the container is 249.367 cm³
Explanation:
Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space. In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
Density, according to the International System of Units, is usually expressed in kilogram per cubic meter (kg/m³) or gram per cubic centimeter (g/cm³).
In this case:
density= 0.790 g/cm³mass= 197 gvolume= ?Replacing:
[tex]0.790 \frac{g}{cm^{3} } =\frac{197 g}{volume}[/tex]
Solving:
[tex]volume=\frac{197 g}{0.790 \frac{g}{cm^{3} } }[/tex]
volume= 249.367 cm³
The volume of the container is 249.367 cm³
help help help help help
What is an action your citizens can take to prevent water waste?
A beach ball has a volume of 2.5 L of gas while at a temperature of 500 K. If the volume decreases to 2 L, what is the new temperature?
Answer:
250k
I Really This Helps A Little Bit.
Use
your table of values to solve the problem below:
What is the (delta)Srxn of the following unbalanced reaction?
N2(g) +
O2(g) →
NO2(g)
do not round
Which of the following is an acceptable method to directly measure volume using the metric system?
A.
Using a balance scale to measure pounds.
B.
Using a graduated cylinder to measure liters.
C.
Using a graduated cylinder to measure gallons.
D.
Using a balance scale to measure grams.
Answer:
c
Explanation:
when measuring liquids you use liters
The acceptable method to directly measure volume using the metric system using a graduated cylinder to measure gallons. Thus, option C is correct.
What is proportion?The angles and relative measurements of a polished gem and the relationships between them are called proportion. Proportion is defined as equation in which two ratios are set equal to each other.
The relationship among the different things or parts with respect to comparative size, degree and number. There are several types of proportion and these are direct proportion, compound proportion, continued proportion, and inverse proportion.
Gravitational force is a force which act on objects which have a matter i.e a object which contains mass. Gravitational force is force which act between two objects which have a mass and both object are try to attract each other.
Therefore, The acceptable method to directly measure volume using the metric system using a graduated cylinder to measure gallons. Thus, option C is correct.
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What of the following is NOT a common property of metals?
Answer:
liquid at room temperature
mercury is an exception to that though
Which of the following best describes where cellular respiration occurs?
O A. In muscle cells
B. In the lungs
C. In every body cell
D. In the intestines
Answer:
The answer is 'C. In every body cell'
Explanation:
I hope this was helpful, have a blessed day.
Three 10 g samples of sugar are represented in the diagram below. Sample A dissolves in water more slowly than sample B. Sample B dissolves more slowly than sample C. Which of the following best explains why Sample A dissolves most slowly?
1.
Events in which molten rock spews out of
the mantle as ash, lava, and gases
Answer:
Landslides, Volcanoes, Earthquakes, and Floods. A opening in the Earth's surface through which melted rock, gases, and ash escape. Events in which molten rock spews out from the mantle to the surface of Earth as ash, lava, and gases
Explanation:
what is the name of the chemical used for bleach in sugar industries
Answer: I think Sulfur dioxide
Explanation: sulfur dioxide is highly known as a bleaching agent in chemical factories during chemical processes and production
I am not to sure about bleaching in the SUGAR FACTORIES but if u need more explanation about sulfur dioxide in bleaching feel free to COMMENT!!!
A greater force is required to move an object with a larger mass than one with a smaller
mass.
Answer:
Explanation:
what do u need to know
¿Cuál de estas sustancias exhibe combustibilidad?
El acero.
El hierro.
El vidrio.
El papel.
Answer:
Acero
Explanation:
PLEASE HELP!! ASAP WILL GIVE BRAILIST (please explain how you got there or show a picture of work)
a) Write the word equation for the reaction of silver chlorate reacts with sodium phosphate to produce silver phosphate and sodium chlorate.
b) Write the balanced formula equation for this reaction.
c) If 287 g of silver chlorate reacts with 52.8 g of sodium phosphate, what is the maximum number of grams mass of silver phosphate will be produced?
d) Identify which reactant is the limiting reactant and which is the excess reactant.
e) How many grams of the excess reactant reacts and how many grams are left over?
Answer:
See Explanation
Explanation:
a) The word equation is;
silver chlorate + sodium phosphate ------> silver phosphate + sodium chlorate
b) The balanced reaction equation of the reaction is;
3AgClO3(aq) + Na3PO4(aq) ------->Ag3PO4(s) + 3NaClO3(aq)
c) amount of silver chlorate reacted = 287 g/191.319 g/mol = 1.5 moles
3 moles of silver chlorate yields 1 mole of silver phosphate
1.5 moles of silver chlorate yields 1.5 * 1/3 = 0.5 moles of silver phosphate
Amount of sodium phosphate reacted = 52.8 g/163.94 g/mol = 0.3 moles
1 mole of sodium phosphate yields 1 mole of silver phosphate
0.3 moles of sodium phosphate yields 0.3 moles of silver phosphate.
Hence the maximum number of grams mass of silver phosphate produced = 0.3 moles * 418.58 g/mol = 125.6 g
d) The excess reactant is silver chlorate while the limiting reactant is sodium phosphate
e) 3 moles of silver chlorate reacts with 1 mole of sodium phosphate
x moles of silver chlorate reacts with 0.3 moles of sodium phosphate
x = 3 * 0.3 = 0.9 moles of silver chlorate reacted
Mass of 0.9 moles of silver chlorate = 0.9 moles * 191.319 g/mol = 172 g of silver chlorate
Hence mass of silver chlorate left over = 287 g - 172 g = 115 g
Which of the following equilibria would not be affected by a pressure change?
1) C2H4(g) + H2O(g) = C2H5OH(g)
2) 4HCl(g) + O2(g) = 2H2O(g) + 2Cl2(g)
3) PF3Cl2(g) = PF3(g) + Cl2(g)
4) CO(g) + H2O(g) = H2(g) + CO2(g)
Answer:
C2H4(g) +H2O(g)=C2H5OH(g)
How many grams of water are needed to produce 8.11 mol of tetraphorsphorus decaoxide? P4 O10 (s) + 6 H2 O (l) → 4 H3 PO
Answer:
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Explanation:
Answer:
bx id k
Explanation:
How many moles of gas are in a room with a volume of 85.0 L? A light bulb in the same room at the same temperature and pressure has a volume of 61.0 L and a 9.00 moles of gas.
Answer: A light bulb in the same room at the same temperature.
Explanation: Yw, BYE!!!
Which statements correctly match the part of the microscope with its function? (choose all of the correct answers)
A
Ocular (Eyepiece) Lens: The knob that allows you to change the focus.
B
Objective Lenses: The lenses closest to the specimen.
C
Base: The lens at the top that you look through.
D
Arm: The very bottom of the microscope, used for support.
E
Stage: The flat platform where the slide is placed.
F
Stage clips: Metal clips that hold the slide in place.
Answer:
27
Explanation:
Which statement describes aluminum?
A. Aluminum is a conductor because the outer electrons of its atoms can move freely.
B. Aluminum is an insulator because the outer electrons of its atoms can move freely.
C. Aluminum is a conductor because its atoms form polar covalent bonds.
D. Aluminum is an insulator because its atoms do not have any valence electrons.
Answer: A. Aluminum is a conductor because the outer electrons of its atoms can move freely.
Explanation: Quizzed
The statement which best describes Aluminium is Option A , Aluminum is a conductor because the outer electrons of its atoms can move freely.
What is a Metal ?A substance with high electrical conductivity, luster, and malleability, which readily loses electrons to form positive ions (cations).
Metals conduct electricity because they have “free electrons.”
Unlike most other forms of matter, metallic bonding is unique because the electrons are not bound to a particular atom.
This allows the delocalized electrons to flow in response to a potential difference.
Aluminium is a metal and so a conductor.
Therefore , the statement which best describes Aluminium is Option A , Aluminum is a conductor because the outer electrons of its atoms can move freely.
To know more about Metals
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dose my hair look good
Answer:very blurry but yes
Explanation: