Answer:
Decantation
Explanation:
Decantation is a process for the separation of mixtures of immiscible liquids or of a liquid and a solid mixture such as a suspension.
as most substances are cooled they expand true or false
Answer:
False
Explanation:
Question 21
2 pts
(02.04 MC)
How does a change in temperature affect the rate at which a lollipop dissolves in water? (2
points)
O Changing the temperature of water should have no effect on the rate at which the lollipop dissolves.
O Decreasing the temperature of water increases the surface area of the lolipop, making it more
O Increasing the temperature of water decreases the rate at which the lollipop dissolves.
O Increasing the temperature of water increases the speed at which the lollipop dissolves.
soluble.
Suppose a new group 5A element is discovered. Photoelectron spectroscopy (PES) reveals that its last two peaks occur at 1370 kJ/mol and 777 kJ/mol. Calculate the average valence electron energy (AVEE) of this element.
Answer: The average valence electron energy (AVEE) of this element =
1014.2 KJ/ mol or 1.0142mJ/mol.
Explanation:
The average valence electron energy = (number of electrons in s subshell x Ionization energy of that subshell) + (number of electrons in p subshell x Ionization energy of that subshell) / total number of electrons in both subshells of the valence shells.
The 5A elements are non-metals like Nitrogen and Phosphorus with the metallic character increasing as you go down the group, So a new 5A element will have characteristics of its group with 5 valence electron in its outermost shell represented as ns2 np3
Therefore the average valence electron energy (AVEE) of this element will be calculated as
The average valence electron energy = (2 x 1370 kJ/mol + 3 x 777 kJ/mol.) / 5
2740+2331/ 5 =5071/5
=1014.2 KJ/ mol or 1.0142mJ/mol.
True or False
Very few faults occur along plate boundaries
Answer:
False, hope this helps :)
how are Distilled water and tap water alike?
Answer:
They are both water
Explanation:
One is cleaner than the other.
Calculate the mass of 12.3 moles of MgSO4.
Answer:
614 034 kg
Explanation:
n = m/Mm
m = n * Mm
Mm(MgSO4) = 1 * 24.3 * 1 * 32.1 * 4 * 16 = 49921.92
m = 12.3 * 49921.92
m = 614 034 kg
What is best classified as a physical change?
Answers)
A: photosynthesis
B:Digestion
C:Exercise
D:Boiling
Answer:
D
Explanation:
Answer:D:Boiling
Explanation:
During all chemical reactions, charge, mass and energy are
(A) Condensed
(B) Conserved
(C) Decayed
(D) Decomposed
Answer:
(B) Conserved
Explanation:
Describe Henri Becquerel's role in the discovery of radioactivity
Answer:
Explanation:
In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.
X-rays are neutral and cannot be bent in a magnetic field. The new radiation was bent by the magnetic field so that the radiation must be charged and different than x-rays.
ANSWER THE QUESTION BELOW FOR BRAINLEST AND 10 POINTS
Answer:
C
Explanation:
It just is, if you look online and conduct research you will see that compounds look just like number 3. It cannot be A or B.
37. An atom is electrically neutral because the
(1) number of protons equals the
number of electrons
(2) number of protons equals the
number of neutrons
(3) ratio of the number of neutrons
to the number of electrons is 1:1
(4) ratio of the number of neutrons
to the number of protons is 2:1 37
Answer:
(1) number of protons equals the
number of electrons
Explanation:
What type of chemical reaction is the following? BaCl2(aq) + Na2SO4(aq)
→ BaSO4(s) + 2 NaCl(aq) *
Answer:
it's a precipitation reaction.
Explanation:
since a solid is produced, one of the elements are insoluble with one another–making a precipitate.
how could a carbon atom in coal end up in a penguin
Answer:
Explanation:
Combustion of coal releases carbon as CO2. Phytoplankton remove carbon dioxide from the atmosphere by photosynthesis. Carbon is passed along the food chain as fish eat the plants. Penguins feed on the fish, taking in the carbon compounds containing the original carbon atom.
The carbon atoms in coal end up in a penguin due to the process of food chain.
What is a penguin?
Penguins are aquatic flightless birds that are found in the Southern Hemisphere.
The food chain leads to the carbon atom into the penguin.
The carbon atoms are release from the coal combustion.
The released atoms go into plants leaves.
The herbivorous eat plants.
Then the carnivorous eats the herbivorous.
The carnivorous can be a fish and fish are eaten by penguins.
Thus, in this way, the carbon atoms in coal end up in a penguin due to the process of food chain.
Learn more about food chain, here:
https://brainly.com/question/16065961
Methane gas combusts according to the following
chemical equation:
CH4 (8) + 202(g) → CO2(g) + 2H2O(l)
29.2 L of methane gas is combusted with 63.3 L of
oxygen gas at STP. What volume of carbon dioxide
is produced in the reaction?
___L CO2
Your answer should be rounded to three significant figures. Do
not include units in your answer.
The volume of Carbon dioxide : 29.12 L
Further explanationGiven
ReactionCH4 (g) + 202(g) → CO2(g) + 2H2O(g)
Oxygen volume = 63.3 L
Methane volume = 29.2 L
RequiredThe volume of Carbon dioxide
Solution
1 mol gas at STP = 22.4 L
mol methane :
[tex]\tt \dfrac{29.2}{22.4}=1.3[/tex]
mol oxygen :
[tex]\tt \dfrac{63.3}{22.4}=2.83[/tex]
limiting reactant : CH₄(smaller ratio:mol/reaction coefficient)
So mol CO₂ based on CH₄
From equation, CO₂ : CH₄ = 1 : 1, so mol CO₂ = 1.3
The volume =
[tex]\tt 1.3\times 22.4=29.12~L[/tex]
The volume of carbon dioxide is produced in the reaction is 29.12 L
The calculation is as follows:We know that
1 mol gas at STP = 22.4 L
So,
The mol methane is
[tex]= 29.2 \div 22.4\\\\= 1.3[/tex]
Now
The mol oxygen is
[tex]= 63.3 \div 22.4\\\\= 2.83[/tex]
Now the volume is
[tex]= 22.4 \times 1.3[/tex]
= 29.12 L
Learn more: https://brainly.com/question/5763151?referrer=searchResults
True or False. Frogs have to drink a lot of water.
Answer:
frogs do require alot of water, although they do not drink it, they absorb it through their skin.
Explanation: so, it is false.
Which of the following elements is a metalloid?
A. Silicon
B. Sulfur
C. Neon
D. Nitrogen
Answer:
A. Silicon
Explanation:
what best defines concentration
Answer:
Explanation:
Answer. In chemistry, concentration refers to the amount of a substance per defined space. Another definition is that concentration is the ratio of solute in a solution to either solvent or total solution. Concentration usually is expressed in terms of mass per unit volume.
What is this graph showing?
Explanation:
It's a distance-time graph showing the speed of an object
why is this 2H2+O2=2H2O a chemical change
Answer:
chemical change, because you are changing the actual molecules into differerent substances in a chemical way
Explanation:
ASAP!!MARK BRAINLIEST! Mia wants to get her drinking water from an artesian well on her property. To make sure
that this water is drinkable, she must have a laboratory analyze it. Canadian standards state that the maximum permitted amount of boron in drinking water is 5 ppm. A laboratory analyzed a sample of 250 mL of water from Mia's well. This sample
contained 0.1 mg of boron.
Can Mia drink the water from her well?
O Yes
O No
Answer: yes
Explanation:
Answer:
yes
Explanation:
due to the properties of baron she should be fine
The compound CO2 is made of?
Answer:
one atom of carbon dioxide and two atoms of oxygen = CO2
hope this answer will help you
When an unbalanced force acts on an object, the change in the object's _______ or _______ depends on the size and direction of the force.
A.
position; mass
B.
speed; direction
C.
mass; speed
D.
direction; mass
Answer:
B
Explanation:
Determine the change in energy when an electron transitions from n= to n=5?
Answer:
ΔE = 13.056 ev
Explanation:
Energy associated with nth state is,
En = -13.6/n²
For n = 1
E₁ = -13.6 / 1²
E₁ = -13.6/1
E₁ = -13.6 ev
Kinetic energy of electron = -E₁ = 13.6 ev
For n = 5
E₅ = -13.6 / 5²
E₅ = -13.6/25
E₅ = -0.544 ev
Kinetic energy of electron = -E₅ = 0.544 ev
Wavelength of radiation emitted:
ΔE = hc/λ = E₅ - E₁
by putting values,
ΔE = -0.544ev - (-13.6 ev )
ΔE = 13.056 ev
The chemical formula of its chloride of a metal m is MCl3. Write the chemical formula of its chloride, bicarbonate, and sulphide.
plz answer asap
Explanation:
Chemical formula of chloride of metal M is MCl₃
We know that Cl has valency 1.
nowzl, it's cleared that M had valency 3.
Bcz the after criss-cross it forms MCl₃.
Now,
Chemical formula of bicarbonate:
we know that bicarbonate has its valency/charge 1
So, after criss-cross the formula of metal bicarbonate is M(HCO₃)₃
Chemical formula of sulphide:
we know that sulphide has its valency/charge 2
So, after criss-cross the formula of metal metal is M₂S₃
Identify each of these substances as acidic, basic, or neutral.
___ pure water, pH = 7.0
___ lake water, pH = 6.5
___ baking soda solution, pH = 9
___ soapy water, pH = 12
Answers: neutral, acidic, basic, basic
Answer:pure water is neutral . Lake water is acidic. Baking soda and soapy water are basic.
Explanation: 7 is neutral. The higher on the ph scale like 1-6 is acidic. The lower on the scale 8-13 is base or alkaline.
Answer:
neutral
acidic
basic
basic
Select the correct answer.
Based on the law of conservation of energy, which statement is correct?
A.
Energy is always being added to all parts of the Universe.
B.
Energy is often destroyed in some parts of the Universe.
ОО
C.
Energy in a closed system cannot change forms.
D.
Energy in an isolated system remains constant.
Reset
Next
Answer:
D
Explanation:
Energy can neither be destroyed or created but can change forms.
Hope this helps!
what is disproportionation reaction and give one example of it ?
Answer:
A disproportionation reaction is when a multiatomic species whose pertinent element has a specific oxidation state gets oxidized and reduced in two separate half-reactions, yielding two other products containing the same pertinent element. A convenient example is Mn2O3 becoming Mn2+ and MnO2 .
What is plasama?.......
Explanation:
Plasma is the clear, straw-colored liquid portion of blood that remains after red blood cells, white blood cells, platelets and other cellular components are removed. It is the single largest component of human blood, comprising about 55 percent, and contains water, salts, enzymes, antibodies and other proteins.
Blood plasma is a yellowish liquid component of blood that holds the blood cells of whole blood in suspension. It is the liquid part of the blood that carries cells and proteins throughout the body. It makes up about 55% of the body's total blood volume. It is the intravascular fluid part of extracellular fluid.
What is the meaning of CPI?
Answer:
(CPI) Consumer Price Index
Explanation:
A consumer price index measures changes in the price level of a weighted average market basket of consumer goods and services purchased by households. A CPI is a statistical estimate constructed using the prices of a sample of representative items whose prices are collected periodically.
Mole Conversion: How many moles in 45 grams of H2SO4
Answer:
0.45881381335
Explanation:
divide 45 by the molar mass of H2SO4
45/98.079
Answer:
0.45
Explanation:
divise
