Answer:
salt sodium chloride (NaCl)
The unheated gas in the above system has a volume of 20.0L
at a temperature of 25.0 °C and a pressure of 1.00 atm. The
gas is heated to a temperature of 100.0 °C while the volume
remains constant. What is the pressure of the heated gas?
Ignore the block labeled "A".
da Hint?
Answer:
need more info on block labeled ''A''
Explanation:
The chemical equation shows the production of magnesium chloride.
Mg + 2HCl → MgCl2 + H2
How many grams of H2 will be produced from 12 grams of Mg?
Answer:
1 gram of H2 will be produced from 12 grams of Mg.
Explanation:
According to Stoichiometry, 0.5 moles of Mg are present. 1 mole of Mg produces 1 mole of H2, so 0.5 moles of Mg will produce 0.5 moles of H2. Multiplying molar mass of H2 i.e. 2 gram/mole with 0.5 moles, we can find the mass of H2 in grams which is 1 gram.
List some Industrial plants and indicate the gaseous pollutants they emit
Answer:
Sources of air pollutants from the industry include: power generation plant, boilers, bleaching plants and caustic soda/chlorine plant. Pollutants include particulate matter, chlorine, sulfur dioxides, hydrogen sulfides, carbon dioxide, carbon monoxides and nitrous oxides.
This is really easy plz help me out 25 points
how was potassium discovered?
Answer:
Potassium was the first metal to be isolated by electrolysis. It was discovered by the English chemist Sir Humphry Davy by decomposing molten potassium hydroxide (KOH) with a voltaic battery.
Explanation:
Potassium was discovered by the English chemist Sir Humphrey Davy.
An increase in the temperature of a liquid decreases the rate of
evaporation, true or false?
Answer:
False
Explanation:
The increase in the temperature of a liquid also increases the rate of evaporation, as the same for the other way around. As intermolecular force increase rate of evaporation decreases. This happens because intermolecular force make it less likely for the molecules on the surface to escape from liquid and become vapour gas. As temperature increases rate of evaporation increases.
3.20 g of magnesium reacts with hydrochloric acid, generating
hydrogen gas according to the reaction below. The hydrogen
gas is collected over water.
Mg(s) + 2HCl(aq) MgCl2(aq) + H2(8)
If 2.97 L of hydrogen gas is collected at 760.0 mmHg and
20°C, what was the percent yield of the reaction?
Answer: 93.8
Explanation: hope you have Wonderful grades!!
Corn plants and milkweed plants grow in the same area. Over several years, the milkweed plants have taken over the field and the corn plants no longer have space to grow.
Answer:
This question is incomplete, the complete part of the question is as follows:
This best demonstrates which type of an interaction between the plants?
A. cooperation
B. parasitism
C. commensalism
D. competition
The answer is D
Explanation:
Organisms in their natural environment interact with one another in so many ways. The ways by which this interaction occurs are; competition, predation, commensalism etc.
Competition is the interaction between two organisms in which one or both organisms are harmed due to limited resources. Competition occurs when the organisms involved occupy the same niche or utilize the same limited resources.
In this question involving corn plants and milkweed plants. They are said to grow in the same area. Over several years, the milkweed plants have taken over the field and the corn plants no longer have space to grow. In this case, there is a limited space for growth, hence, the corn plant and milkweed COMPETE.
An engineer is given a time limit of one month to design a compact cell phone that works under water and is durable. What constraint will the engineer be facing when designing this phone?
Size
durability
time for design
resistance to water
These cells produce hyrdochloric acid
Awarding 50 points for this question!!
From the paragraph in the image, what are the independent, dependent, and control variables?
Answer:
there is no paragraph
Explanation:
Consider the energy diagram below.
Which line indicates a higher reaction rate?
A because it has a lower activation energy.
B because it has a lower activation energy.
A because it’s Grxn is much lower
B because it’s Grxn is much lower
Calculate the density mass= 54.2 volume= 78.1
Answer:
0.693 (you can round it up if you want to)
Explanation:
Density= mass ÷ volume
54.2 ÷ 78.1 = 0.693
I hope this helped☺
If 2.1 moles of NaCl is dissolved in a solution with a total volume of 7.3 liters, what is the molarity of the solution? Round to two decimals.
Answer:
The molarity of the solution is 0.29 [tex]\frac{moles}{liter}[/tex]
Explanation:
Molarity, or molar concentration, is a measure of the concentration of a solute in a solution, be it some molecular, ionic or atomic species. It is defined as the number of moles of solute that are dissolved in a given volume.
Molarity is calculated as the quotient between the number of moles of solutes and the volume of the solution:
[tex]Molarity=\frac{number of moles of solute}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
In this case:
number of moles of solute= 2.1 molesvolume= 7.3 litersReplacing:
[tex]Molarity=\frac{2.1 moles}{7.3 liters}[/tex]
Molarity= 0.29 [tex]\frac{moles}{liter}[/tex]
The molarity of the solution is 0.29 [tex]\frac{moles}{liter}[/tex]
Answer:
M = 0.29 M
Explanation:
We are given;
Number of moles of NaCl; n = 2.1 moles
Total volume of solution; V = 7.3 L
Formula for molarity is;
M = n/L
Thus;
M = 2.1/7.3
M = 0.2878 M
Approximating to 2 decimal places gives;
M = 0.29 M
What ion will Magnesium form?
Your body is made up of trillions of cells that perform all the functions you need to survive. Which other kinds of organisms are composed of cells?
Only animals are composed of cells.
Only animals are composed of cells.
Only animals and plants are composed of cells.
Only animals and plants are composed of cells.
Only animals, plants, and bacteria are composed of cells.
Only animals, plants, and bacteria are composed of cells.
All organisms are composed of cells.
Which of the following techniques can be used to separate a heterogeneous mixture into its component parts? (3 points)
Sort by color
Separation by density
Apply heat
Apply pressure
Answer:
Separation by density
Hope this helps
What happens to a glass of pure fruit juice when water is added to it?
a
The number of moles of fruit juice increases.
b
The number of moles of fruit juice decreases.
c
The molarity of the juice increases.
d
The molarity of the juice decreases.
Answer:
D is the answer i think
When we add water to a glass of pure fruit the volume of the solution increases while the solute remains constant so the molarity of the juice decreases.
What is Molarity ?Molarity is defined as the amount of solute (in moles)in per litre of solution.
It is also known as molar concentration of a solution , It is expressed in mol/l .
When water is added the volume of the solution is increasing for fixed moles of juices therefore ,
The molarity of the juice will decrease and option d is correct.
To know more about molarity
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The information below pives PH values of solutions , w,XYZ
Solution
Pl values
2
6.5
W
Y
z
14
4.5
(a) Which solution is likely to be:
(i) Calcium hydroxide?
(1) Rain water?
Answer:
The calcium hydroxide solution will likely have the pH of 14 (very basic) while rain water will likely have a pH if 6.5 (slightly acidic).
Calculate the mass, in grams, of 0.965 mol of sodium hydroxide
(NaOH), in a drain cleaning solution.
Answer:
38.51g NaOH
Explanation:
NaOH=39.907 g/mol
0.965 mol NaOH X 39.90g NaoH/1 mol NaOH= 38.51 g NaOH
Desiré was investigating a chemical reaction.When she heated it up, she found that sulfuric acid changed into water. She made the following atomic-scale model to show what she thinks happened. Do you think this is a complete model of what happened during the chemical reaction?
Answer:
no it is not a complete model
If a bond forms between calcium and chlorine, the bond is covalent.
True or False
Answer:
False
Explanation:
there should be sharing of electrons between two of the atoms to be a covalent bonding. but there is no linkage of electron between them
what is the molar mass of c2h16?
use 4 significant figures in your answer.
Answer:
40.15 g/mol
Explanation:
The molar mass of c2h16 is
40.1484 g/mol ≈ 40.15 g/mol (rounded to 4 significant figures)
what is the pH of water?
Answer:
7.00
Explanation:
Pure Water is the only purely neutral substance on earth so it has a neutral pH of 7
how many elements are there
Answer:
there r 118 elements in periodic table..
hope it helps.
Explanation:
there are 118 elements.
which of the following formulas represent a covalent molecule?
A)CaS
B)Co2
C)Na2O
D)FeCl3
Answer:
which of the following formulas represent a covalent molecule?
A)CaS
B)Co2
C)Na2O
D)FeCl3
someone help asap it is due in 5 minutes
Answer:
Kingdom
Explanation:
Out of all the choices, Kingdom is the most inclusive and least specific.
When the question asks for the most inclusive and least specific group, it is asking for the most broad group.
Also, you can just look at the left of the image. It basically shows you the answer.
what is the percent yield if the combustion of gasoline results in 680 grams of steam produced when a theoretical yield is 985 grams of steam?
Answer:
69%
Explanation:
Percent yield = ?
Theoretical yield = 985 grams
Experimental Yield = 680 grams
Percent Yield = Experimental Yield / Theoretical Yield * 100
Percent Yield = 680 / 985 * 1 00
Percent Yield = 0.690 * 100 = 69%
Given 750 g of oxygen gas and chlorine gas and an excess of the other reactants, how much potassium chloride (grams) will be produced?
2MnO2 + 4KOH + O2 + Cl2 -> 2KMnO4 + 2KCl + 2H20
must show work
Answer:
=2h20−2kmno4+2mno2+2ckl+cl2+4hko+o2
Explanation:
step-by-step.
2mno2+4koh+o2+cl2−2kmno4+2kcl+2h20
=2mno2+4hko+o2+cl2+−2kmno4+2ckl+2h20
explain what happens during a solar eclipse
Answer:
a solar eclipse is when the moon moves between the earth and the sun, so the moon casts a shadow on the earth
Explanation:
Answer:
the moon gets in the way of the sun and cast a shadow onto earth
Explanation: