Answer:
True.Explanation:
same system, heterogeneous nucleation will occur at less undercooling than homogeneous nucleation.
how many neutrons of atomic mass is 31 and atomic number is 12
[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
As we know, Number of protons = Atomic Number
So,
Number of protons = 12And, Atomic mass = Number of protons + Number of Neutrons (N)
therefore ~
31 = 12 + N N = 31 - 12 N = 19Number of Neutrons = 19
Which type of mixture can be separated using a sieve?
A homogeneous mixture with components of varying sizes
A homogeneous mixture with components of the same size
A heterogeneous mixture with components of the same size
A heterogeneous mixture with components of varying sizes
Answer:
D: a heterogeneous mixture with components of varying sizes
Heterogeneous mixture is a combination of substances that doesn't have uniform composition and properties. Just by looking at the mixture you can differentiate the compounds because they are so different. Using a sieve, allows the components with different sizes to separate, while one is retained, the others can pass the holes in the sieve.
Explanation:
Answer: D, a heterogeneous mixture with components of varying sizes.
Heterogeneous mixture is a combination of substances that doesn't have uniform composition and properties. Just by looking at the mixture you can differentiate the compounds because they are so different. Using a sieve, allows the components with different sizes to separate, while one is retained, the others can pass the holes in the sieve.
What is the volume, in liters, of 1.4 moles of CO2 gas at STP?
Answer:
22.4 L.
Explanation:
how do I know which substance is being reduced?
how many moles of water in 100 grams
Answer:
There are approximately 5.55 moles
Explanation:
what element has 12 protons 12 neutrons and 11 electrons
Answer:
sodium atom
Explanation:
An elephant takes a deep breath, releasing 9.50g of CO2. How many molecules CO2 is this?
Answer:
3 significant figures.
Explanation:
So, a mole is essentially a group of things. In this case, a mole of carbon dioxide will contain
6.022 ⋅ 10 [ by the 23rd power]
molecules of carbon dioxide. In other words, in order to have
1 molecule of carbon dioxide, you need to have 6.022 ⋅ 10 [by the 23rd power] molecules of carbon dioxide.
You know that 5.00 ⋅ 10 [ by the 2nd power] molecules of carbon dioxide are exhaled from the lungs when we breathe out. You can use Avogadro's constant as a conversion factor to help you figure out how many molecules are present.
Don’t understand this science Question.
Answer:
I got you..you need help but with which question?
Explanation:
Have a great day!
What are the most important topics for revision in chemistry?
Answer:
structure of atom
states of matter
classification of elements and periodicity in properties
thermody namic
Equilibrium
Redox reacation
True or False: Passive transport occurs when molecules move from an area of low concentration to high concentration.
40 PIONTS!! PLZZZZ HELP
Determine whether each of the following will undergo dissociation,
dissolving or ionization. Then write the solvation equation for each
substance:
a) Lithium oxide
b) Magnesium nitride
c) Hydrobromic acid
Lithium oxide is able to undergo both the processes of dissolution and dissociation.
Dissociation refers to the break down a chemical substance into its constituents. Ionization refers to the loss of electrons from a chemical specie while dissolving refers to the ability of a solid to form a solution.
Let us now look at each of the following species;
Lithium oxide undergoes dissolution and dissociation. Magnesium nitride undergoes dissolution and dissociation.Hydrobromic acid undergoes dissolution and dissociation.Learn more about ionization: https://brainly.com/question/1602374
Hello! Everyone:) I was just wondering if you can help me with my test.
Points: 99
Answer:
By their properties ;)
Explanation:
[tex]\Large \boxed{\sf by \ their \ properties}[/tex]
Every element has a set of particular characteristics. Each has a unique atomic and mass number because they contain a different ratio of protons and neutrons. The number of protons in an element mirrors the element's atomic number. The mass number equals the sum of the element's protons and neutrons.
According to increasing atomic numbers, chemical elements get organized. Periods and groups are the names of the horizontal rows and vertical columns, respectively. The chemical characteristics of elements within the same group are comparable due to their similar valency and number of outer electrons.
A gas occupies 900 mL at a temperature of 27 °C. What is the volume at
132 °C?
Answer:
4400 ml
Explanation:
How many grams are in 3.4 moles of Lead (IV) Sulfate (Pb(SO4)2)? ) Molar mass: 303.26 g/mol 131.0840
Answer:
1031.084g
Explanation:
n=m/M
m=n(M)
m = (3.4mol)(303.26g/mol)
1031.084g
Hope that helps
Answer:
1031.08
Explanation:
You start with 3.4 moles and you know that 6.022 x 10 ^ 23 = 1 mole( Avogadro's Number), so you just multiply those 2 numbers and the moles will cancel leaving you with grams of Lead Sulfate.
The chemical equation below shows the burning of magnesium (Mg) with oxygen (O2) to form magnesium oxide (MgO). 2Mg O2 Right arrow. 2MgO The molar mass of O2 is 32. 0 g/mol. What mass, in grams, of O2 is required to react completely with 4. 00 mol of Mg? 2. 00 64. 0 128 256.
Answer:
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The mass of oxygen required for complete utilization of 4 mol of Mg has been 64 g. Thus, option B is correct.
The balanced equation for the reaction has been:
[tex]\rm 2\;Mg\;+\;O_2\;\rightarrow\;2\;MgO[/tex]
From the balanced chemical equation, for complete utilization of 2 moles of Mg, 1 moles of oxygen has been used.
The given moles of Mg has been 4 mol. The moles of oxygen required can be given as:
[tex]\rm 2\;mol\;Mg=1\;mol\;O_2\\4\;mol\;Mg=2\;mol\;O_2[/tex]
Thus, the moles of oxygen required has been 2 mol for complete utilization of 4 mol Mg.
The mass from moles can be calculated as:
[tex]\rm Mass=Moles\;\times\;molecular\;mass[/tex]
The molecular mass of oxygen has been 32 g/mol.
The mass of oxygen has been:
[tex]\rm Mass=2\;\times\;32\;g\\Mass=64\;g[/tex]
The mass of oxygen required for complete utilization of 4 mol of Mg has been 64 g. Thus, option B is correct.
For more information about the chemical equation,refer to the link:
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Mr. Jenson's class is observing the growth of one kind of pea plant.
The class wants to design an experiment to answer the question, "What amount of water will cause the plants to produce the greatest number of peas?"
What could the class do to create the experiment?
A.
give all the pea plants the same amount of water and count the number of peas that the plants produce
B.
give all the pea plants different amounts of water and only guess the number of peas that the plants produce
C.
give all of the pea plants different amounts of water and count the number of peas that the plants produce
D.
stop watering all of the pea plants and then count the number of peas that the plants produce
Answer:
The answer would be C. Giving the pea plants a different amount of water in each one can help you observe how much water produces the most peas in a pea pod.
The answer is C to give all of the pea plants different amounts of water and count the number of peas that the plants produce
Explanation:
Answer:
C. give all of the pea plants different amounts of water and count the number of peas that the plants produce
Explanation:
The class wants to design an experiment that answers the question, "What amount of water will cause the plants to produce the greatest number of peas?"
To answer the question, the experiment should show how many peas the plants produce when they are given different amounts of water. The best way to do this would be to give all of the plants different amounts of water and count the number of peas that the plants produce.
elements of the fourth period fill the 4s sublevel with electrons before filling the 3d sublevel. Also, some elements move an electron from a filled 4s sublevel to an unoccupied 3d sublevel. Explain these behaviors
Answer:
Elements fill the lowest energy subshells first(Aufbau's rule), and the 4s subshell is lower energy than the 3d, making the labeling deceiving. In some rare situations, the electrons would rather have Hund's rule be respected more, having all electrons facing one way with no doubled up because it is more stable(these are pretty rare and usually deal with transition metals like copper).
Hope this helps!
Explanation:
As it has less energy than the 3d orbital, the 4s orbital fills next. Following the filling of the electrons, 4s has more energy than 3d. Therefore, the two electrons in the 4s are at a higher energy than they could be in the 3d since it has a vacancy. As a result, electrons transition from a higher to a lower energy orbital.
What are electrons ?The elementary electric charge of the electron is a negative one, making it a subatomic particle. Due to their lack of components or substructure, electrons, which are part of the lepton particle family's first generation, are typically regarded to be elementary particles.
Since 4s electrons are bound by the nucleus farther away and more loosely than 3d electrons, 4s electrons are eliminated first rather than 3d electrons.
The 4s orbital should always be filled before the 3d orbitals, according to the Aufbau principle, although this isn't the case for the majority of elements. After Sc, electrons actually enter the 3d orbitals first because they have a lower energy than the 4s orbital.
Thus, electrons transition from a higher to a lower energy orbital.
To learn more about an electron, follow the link;
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why is xenon monatomic but bromine is diatomic
Help answer these chemistry questions
Answer:
45th answer is pure and properties 42 is periodictable
A 0.03 mol sample of NH4NO3 (s) is placed in a 1 L evacuated flask, which is then sealed and heated. The NH4NO3 (s) decomposes completely according to the balanced equation above. The total pressure in the flask measured at 400 K is closest to which of the following? (The value of the gas constant, R, is 0.082 L atm mol-1 K-1.)
a. 3 atm
b. 1 atm
c. 0.5 atm
d. 0.1 atm
e. 0.03 atm
The total pressure in the flask measured at 400 K is 1 atm
The correct answer to the question is Option B. 1 atm
From the question given above, the following data were obtained:
Number of mole (n) = 0.03 mole Volume (V) = 1 L Temperature (T) = 400 KGas constant (R) = 0.082 atm.L/Kmol Pressure (P) =?Using the ideal gas equation, we can obtain the pressure in the flask as follow:
PV = nRT
P × 1 = 0.03 × 0.082 × 400
P = 1 atmTherefore, the total pressure in the flask measured at 400 K is 1 atm
Learn more on ideal gas equation: https://brainly.com/question/4147359
Answer: a: 3 atm
Explanation:
0.03 mol NH4NO3 decomposes into 0.09 mol of gas total, thus we multiply 0.09 by 0.082 and 400K to get our answer of about 3 atm.
Please Help
Predict the nature of the indicated covalent
bond. Polar or Non polar
Answer:
Nonpolar
Explanation:
What did you observe about the properties of the sodium carbonate mixture before the substances were mixed together?
Answer:
Would you consider adding a sodium carbonate solution to a magnesium sulfate .
Explanation:
??
A chemist heats a gas within a sealed, rigid container. Which statement describes the changes that occur in the gas? (1 point)
-The gas particles move slower and hit the sides of the container with less force, consequently, the pressure
increases
-The gas particles move slower and hit the sides of the container with less force, consequently, the pressure decreases
-The gas particles move faster and hit the sides of the container with more force, consequently, the pressure
increases
-The gas particles move faster and hit the sides of the container with more force, consequently, the pressure
decreases
When a gas is heated in a sealed container, the gas particles move faster and hit the sides of the container with more force leading to an increase in the pressure of the gas.
An increase in the temperature of a gas increases the collision rate of the molecules of the gas according to the kinetic theory.
With increased kinetic energy, the molecules of the gases collide more frequently with each other and the walls of the container.
The collision creates an increase in the magnitude of pressure inside the container.
More on the kinetic theory of gases can be found here: https://brainly.com/question/15354399?referrer=searchResults
Answer:
C
Explanation:
When a gas is heated in a sealed container, the gas particles move faster and hit the sides of the container with more force leading to an increase in the pressure of the gas.
Rebekah finds that a solution of sugar in water has a volume of 1. 32 fl. Oz. How should she report this amount using the metric system? (1 fl. Oz. = 29. 6 mL) 0. 403 m 1. 40 qt 37. 5 g 39. 1 mL.
Rebekah reports the volume of sugar solution using metric system as 39.1 mL. Thus, option D is correct.
The metric system has been the measurement system introduced in 1790s. The system has mediated the units for the measurement of volume, mass, length.
The volume has been the space that has been occupied by matter. The volume can be denoted with SI unit L. However, the another accepted unit for volume has been mL.
Thus, the volume of sugar solution has been reported in mL.
The given sugar solution has volume of 1.32 fl. Oz
The volume in mL can be given as:
[tex]\rm 1\;fl\;Oz=29.6\;mL\\1.32\;fl\;Oz=1.32\;\times\;29.6\;mL\\1.32\;fl\;Oz=39.1\;mL[/tex]
The volume of the sugar solution reported by Rebekah on the metric scale has been 39.1 mL. Thus, option D is correct.
For more information about the metric system, refer to the link:
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the name of element P
Answer:
phosphorus
Explanation:
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if you mix calcium hydrogen and carbon how many compounds will you have?
Answer:
Calcium monohydride is a molecule composed of calcium and hydrogen with formula CaH. It can be found in stars as a gas formed when calcium atoms are present with hydrogen atoms.Calcium carbonate is a chemical compound with the formula CaCO3 formed by three main elements: carbon, oxygen and calcium.
Explanation:
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Name the following molecule in the image
[tex]\\ \sf{:}\longrightarrow 2,4-diethyl-2-methylpentane[/tex]
When 25.0 g of NaCl is added to 175 g of water, the mass percent (m/m) NaCl is ________. 7.00% 8.00% 12.5% 25.6% 14.3%
Answer:
12.5%
Explanation:
percent blurf = quantity of blurftotal quantity×100quantity of blurftotal quantity×100
So for percent by mass, both quantities are expressed as mass, and it’s the mass of NaCl divided by the total mass of the solution, then times 100%
mass % NaCl = 25 g/175g×100
mass %NaCl = 14.3%
how much heat is released when 32g of water cools from 46°C and freezes
The amount of heat released when 32g of water cools from 46°C and freezes is 6182.4 J
Heat: This is a form of energy that brings about the sensation of warmth. The S.I unit of heat is Joules (J)
⇒ Formula:
Q = cm(t₂-t₁).................. Equation 1⇒ Where:
Q = amount of heat releasedc = specific heat capacity of waterm = mass of watert₁ = Initial temperaturet₂ = Final temperatureFrom the question,
⇒ Given:
m = 32 g = 0.032 kgt₁ = 46 °Ct₂ = 0 °C (Freezing point)c = constant = 4200 J/kg.°C⇒ Substitute these values into equation 1
Q = 0.032(4200)(0-46)Q = -6182.4 JNote: The negative sign tells that heat is released and as such can be ignored.
Hence, The amount of heat released is 6182.4 J
Learn more about heat here: https://brainly.com/question/9614649
Which of the following is a binary compound?