Answer:
Salt and water can be separated by boiling
Explanation:
When the water boils the salty water it heats it up and separates the mixture and only the salt will remain and the water will evaporate
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Find the number of moles in 1.00 x 1023 atoms of chromium.
Answer:
0.17 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
We have
[tex]n = \frac{1.00 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{1}{6.02} \\ = 0.166112[/tex]
We have the final answer as
0.17 molesHope this helps you
. What is the OH- concentration of a neutral solution?
A neutral solution is one that is neither acidic nor basic. The hydrogen ion concentration equals the hydroxide ion concentration, and both equal 1 X 10-7 M. In a neutral solution, then, pH = pOH = 7.
The table shows four solutions that were prepared by
dissolving salt in water.
Solution
Mass of NaCl Volume of Water
(g)
(mL)
A
5.0
50.0
B
5.0
75.0
С
5.0
100.0
D
5.0
125.0
Which of the solutions has the highest salt
concentration?
O A. Solution B
OB. Solution D
O C. Solution C
O D. Solution A
Answer:
a
Explanation:
The solution that has the highest concentration given the data is solution A ( Option D)
What is molarity?This is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
How to determine the mole of NaCl Mass of solute = 5 g Molar mass of NaCl = 58.5 g/mol Mole of NaCl =?Mole = mass / molar mass
Mole of NaCl = 5 / 58.5
Mole of NaCl = 0.085 mole
How to determine the molarity of solution AMole of NaCl = 0.085 mole Volume = 50 mL = 50 / 1000 = 0.05 L Molarity of solution A =?Molarity = mole / Volume
Molarity of solution A = 0.085 / 0.05
Molarity of solution A = 1.7 M
How to determine the molarity of solution BMole of NaCl = 0.085 mole Volume = 75 mL = 75 / 1000 = 0.075 L Molarity of solution B =?Molarity = mole / Volume
Molarity of solution B = 0.085 / 0.075
Molarity of solution B = 1.13 M
How to determine the molarity of solution CMole of NaCl = 0.085 mole Volume = 100 mL = 100 / 1000 = 0.1 L Molarity of solution C =?Molarity = mole / Volume
Molarity of solution C = 0.085 / 0.1
Molarity of solution C = 0.85 M
How to determine the molarity of solution DMole of NaCl = 0.085 mole Volume = 125 mL = 125 / 1000 = 0.125 L Molarity of solution D =?Molarity = mole / Volume
Molarity of solution D = 0.085 / 0.125
Molarity of solution D = 0.68 M
SUMMARY
Molarity of solution A = 1.7 MMolarity of solution B = 1.13 MMolarity of solution C = 0.85 MMolarity of solution D = 0.68 MThus, solution A has the highest concentration of the salt.
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what do molecules and elements have in common
Answer:
They both are made up of atoms and having bonds linking their atoms together.molecules and compounds also share the qualities of being both pure and homogeneous substances.
Explanation:
Hope this helped!!!
I need help, I just need someone to answer the question today or tomorrow!
Answer:first one is carbon
Explanation:
Other than that I don’t know
Which of the following has the highest induced dipole interactions in its molecule?
a. He
b. Ar
c. Ne
d. Kr
Answer:
Option A
Explanation:
In Dipole -induced dipole forces/interactions a polar and a non polar molecule group together to form a bond.
The higher is the electronegativity, the higher is the Dipole-Induce dipole.
As electronegativity defines the ability of an atom to attract a pair of electron in any chemical bond.
The smaller the atom, the higher is the electronegativity and hence the higher is the Dipole -induced dipole forces/interactions
Option A
what is unique about an elements structure?
Explanation:
Atomic Number and MassEach element has its own unique properties. Each contains a different number of protons and neutrons, giving it its own atomic number and mass number. The atomic number of an element is equal to the number of protons that element contains.
If a young girl learned that it would be 0° C, or 32° F, the next
day then what kind of weather should she expect?
Answer:
Cold
Explanation:
Because 0°C And below or 32°F Refers To Cold Weather
Michelle learns in science class that simple machines such as an inclined plane can change the amount of force needed to lift heavy objects. She decides to test this with an experiment.
Michelle chooses a 10 kg weight. She sets up a ramp made of smooth metal that makes an angle θ with the floor. She attaches a spring scale to the weight and the top of the ramp in order to hold the weight in place. She records the force from the spring scale, then changes θ and records it again. She repeats this several times.
In this experiment, what is the outcome variable (dependent variable)?
A.
the angle θ between the ramp and the ground
B.
the mass of the weight
C.
the material the ramp is made of
D.
the amount of force on the spring scale
PLEASE I NEED HELP ON THIS RN AND IT'S DUE TODAY!!!!!!!!
IF YOU POST ANY LINKS THAT ARE PERM-BLOCKED, I WILL REPORT YOU, TAKE YOUR POINTS AWAY, DELETE YOUR ANSWER, AND PROBABLY BAN YOU! IF YOU DO NOT KNOW, DON'T ANSWER!!!!!!!
Answer: the amount of force on the spring scale
Explanation:
How many moles are in 56.7g of Fe?
Answer: n= 1.02 moles
Explanation: relative atomic mass of Fe is 55.85.
Amount of substance n= m/M = 56.7 g /55.85 g/mol
Which is the reactant - and why?
Explanation:
The substance(s) to the left of the arrow in a chemical equation are called reactants. A reactant is a substance that is present at the start of a chemical reaction. The substance(s) to the right of the arrow are called products . A product is a substance that is present at the end of a chemical reaction
Molecular geometry of AX2E
Answer:
This molecule is made up of 3 equally spaced sp2 hybrid orbitals arranged at approximately 120o angles. The shape of the orbitals is planar triangular. One orbital contains a lone pair of electrons.
the volume of alcohol present in 409ml of 11%
Answer:
Amount of Alcohol volume present in solution = 44.99 ml
Explanation:
Given:
Total volume of solution = 409 ml
Amount of Alcohol percentage present in solution = 11%
Find:
Amount of Alcohol volume present in solution
Computation:
Amount of Alcohol volume present in solution = Total volume of solution x Amount of Alcohol percentage present in solution
Amount of Alcohol volume present in solution = 409 x 11%
Amount of Alcohol volume present in solution = 409 x 0.11
Amount of Alcohol volume present in solution = 44.99 ml
Three moles of oxygen gas is stored in a 2.5-liter container at 35°C. What is the pressure of this gas?
Answer:
The pressure of the gas is 30.3072 atm.
Explanation:
An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:
P * V = n * R * T
In this case:
P= ?V= 2.5 Ln= 3 molesR= 0.082 [tex]\frac{atm*L}{mol*K}[/tex]T= 35 C= 308 K (being 0 C= 273 K)Replacing:
P* 2.5 L= 3 moles* 0.082 [tex]\frac{atm*L}{mol*K}[/tex] *308 K
Solving:
[tex]P=\frac{ 3 moles* 0.082 \frac{atm*L}{mol*K} *308 K}{2.5 L}[/tex]
P= 30.3072 atm
The pressure of the gas is 30.3072 atm.
Thermal energy added to a substance that is not changing state causes the substance’s temperature to
Group of answer choices
decrease.
increase
remain unchanged
vary unpredictably
Answer:
increase
Explanation:
Conduction involves the transfer of electric charge or thermal energy due to the movement of particles. When the conduction relates to electric charge, it is known as electrical conduction while when it relates to thermal energy, it is known as heat conduction. Conductors include metal, steel, aluminum, copper, frying pan, pot, spoon etc.
In the process of heat conduction, thermal energy is usually transferred from fast moving particles to slow moving particles during the collision of these particles. Also, thermal energy is typically transferred between objects that has different degrees of temperature and materials (particles) that are directly in contact with each other but differ in their ability to accept or give up electrons.
Hence, thermal energy added to a substance that is not changing state causes the substance’s temperature to increase because it would absorb energy in the form of heat.
If you traveled 25 meters in 100 seconds, what is your speed?
.25 meters per second
25/100
.25
100/100
1
An unknown gas at standard temperature and pressure
contains 2.63 moles. What volume does this unknown gas
Occupy?
Answer
V2 = 24.872
Explanation:
If 3.7 moles of propane are at a temperature of 28°C and are under 154.2 kPa of pressure, what volume does the sample occupy? ... 145 g of carbon dioxide have a volume of 34.13 dmº What is the temperature ... a pressure of 3.11 atm, a 276 g sample of
an unknown noble gas occupies 13.46L
Is the formation of CO2(g) from its elements endothermic or exothermic?
Exothermic because the ΔH is negative.
Endothermic because the ΔH is negative.
Endothermic because the ΔH is positive.
Exothermic because the ΔH is positive.
Use the reaction below to balance the nuclear reaction equation.
Superscript 22 subscript 11 upper N right arrow superscript a subscript z variable X plus superscript 0 subscript plus 1 e.
The isotope produced from the beta plus decay of sodium-22 is
.
Answer:
neon-22
Explanation:
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The isotope produced from the beta plus decay of sodium-22 is neon 22.
What are isotope ?Isotopes are two or more types of atoms that have the same atomic number and position in the periodic table but differ in nucleon numbers because their nuclei have different numbers of neutrons.
Carbon 12 and Carbon 14 are both carbon isotopes, one with 6 neutrons and the other with 8 neutrons (both with 6 protons). Carbon-12 is an isotope that is stable, whereas carbon-14 is a radioactive isotope (radioisotope). Uranium-235 and uranium-238 are naturally occurring elements in the Earth's crust. Both have extremely long half-lives.
Different elements exist when two atoms have different numbers of protons. If two atoms have the same number of protons but different numbers of neutrons, they are referred to as isotopes. We use two terms to identify nuclides.
Thus,The isotope produced from the beta plus decay of sodium-22 is neon 22.
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12. Label Each part of the atom:
Answer:
Atom Labeling
Explanation:
Y- neutron
Z-protron
X - electron
W- nucleus
2. Which answer is NOT the definition for one of these terms: volcano,
lava, magma?
O a crack or fracture in the Earth's crust where movement occurs
molten rock stored beneath Earth's surface
magma that erupts on Earth's surface
vents in Earth's crust through which molten rock flows
5.
Cr(NO3)3 (aq)
+
Ba (s)
Complete lonic:
I
Net lonic:
Answer:
Complete ionic: 2Cr(3+) + 6(NO3)- + 3Ba = 2Cr + 3Ba(2+) + 6(NO3)-
Net ionic; 2Cr(3+) + 3Ba = 2Cr + 3Ba(2+)
Explanation:
We are given;
Cr(NO3)3 (aq) + Ba (s)
Let's first find the product of this reaction before getting the complete and net ionic equations.
2Cr(NO3)3 + 3Ba = 2Cr + 3Ba(NO3)2
The complete ionic equation will be;
2Cr(3+) + 6(NO3)- + 3Ba = 2Cr + 3Ba(2+) + 6(NO3)-
The net ionic equation is gotten by eliminating the spectator ions from both left and right hand sides of the equation.
Thus, net ionic equation is;
2Cr(3+) + 3Ba = 2Cr + 3Ba(2+)
10 examples of salt in chemistry
Answer:
nacl cacl kcl mgcl k2so4 na2co3 na2so4 kno3 nahco3 naco3
Explanation:
d. 2 5. How many moles of HCl are needed to produce 25 moles of KCl in the presence of excess potassium permanganate? a. 16 b. 32 c. 5 d. 200
Answer:
d. 200.
Explanation:
The reaction is:
2KMnO4 + 16HCl ----> 2KCl + 2MnCl2 + 8H2O + 5Cl2
So 2 moles of KCL are produced form 16 moles of HCL
So 25 moles KCL are made from 25 * (16/2) HCl.
= 25 * 8
= 200 moles. HCl.
A sample of gas has a pressure of 100.0 KPa and 25C. Calculate the pressure if the temperature is changed to 125C while the volume remains constant.
Answer:
133.56kPa
Explanation:
Applying Pressure Law,
P/T = P'/T'....................... Equation 1
Where P = Initial pressure, T = Initial Temperature, P' = Final pressure, T' = Final Temperature.
From the question, we were asked to calculate P'
There, we make P' the subject of the equation
P' = PT'/T...................... Equation 2
Given: P = 100kPa, T = 25°C = (273+25) = 298K, T' = 125°C = (273+1250K = 398 K
Substitute these values into equation 2
P' = (100×398)/298
P' = 133.56kPa
Hence the pressure is 133.56kPa
Which of these represents a compound ? *
Water
Hydrogen
Oxygen
Answer:
water
Explanation:
H2O
Answer:The answer is water
Explanation: Hydrogen is an element made of an aggregate of hydrogen atoms while oxygen is an element made of oxygen atoms. However, water is a compound made of water molecules.
1. How is extinction different from mass extinction?
Answer:
Extinction is the elimination of one species whereas mass extinction results in multiple animals to become extinct.
1.1.2 Differentiate between a micro and macro mineral element,
Explanation:
Macro minerals are present at larger level in the animal body or required in large amount in the diet. Such as calcium, chlorine, magnesium, potassium, sulphur, and sulfur.Micro minerals are often referred to as trace minerals i.e; they are present at low levels in the body and required in smaller amounts in the animal diet. Such as zinc, iron, iodine, cobalt, copper, flurion, etc.Question 2 1P Which of the following combinations does not include any state functions? volume, work. temperature, work, pressure, temperature. work, heat