Answer:
The molarity of a 50.0 ml aqueous solution containing 10.0 grams of table sal, Nacl, is 3.42 [tex]\frac{moles}{L}[/tex]
Explanation:
Molarity is a unit of concentration based on the volume of a solution and is defined as the number of moles of solute per liter of solution. Then, the molarity of a solution is calculated by dividing the moles of the solute by the liters of the solution.
[tex]Molarity (M)=\frac{number of moles of the solute}{volume of the solution}[/tex]
Molarity is expressed in units ([tex]\frac{moles}{liter}[/tex]).
Then you must know the amount of moles of the NaCl solute. For that it is necessary to know the molar mass. Being:
Na: 23 g/moleCl: 35.45 g/molethe molar mass of NaCl is: 23 g/mole + 35.45 g/mole= 58.45 g/mole
Then a rule of three applies as follows: if 58.45 grams are present in 1 mole of NaCl, 10 grams in how many moles will they be?
[tex]moles=\frac{10 grams*1 mole}{58.45 grams}[/tex]
moles= 0.171
So you know:
number of moles of solute= 0.171 molesvolume= 50 mL= 0.05 LReplacing in the definition of molarity:
[tex]Molarity (M)=\frac{0.171 moles}{0.05 L}[/tex]
Solving:
Molarity= 3.42 [tex]\frac{moles}{L}[/tex]
The molarity of a 50.0 ml aqueous solution containing 10.0 grams of table sal, Nacl, is 3.42 [tex]\frac{moles}{L}[/tex]
Ideal Stoichiometry
Barium oxide has a replacement reaction with lithium. Calculate the mass of Barium oxide needed to react with 34.67 g of lithium.
*equation needed and thorough explanation please*
A- 340.5
B- 383.0
C- 455.0
D- 256.8
Answer:
the answer is 383.0
hope it is helpful
What is the name of C3H8?
Answer:
Propane
Explanation:
What are three examples of acid-base reactions in cooking
Answer:
Lemon juice baking soda and vinegar
Explanation:
ILL GIVE YOU BRAINLIST * have to get it right * !!! Although individual body systems can perform specific functions, they depend on one another and work together for the good of the entire organism.
Which of the following provides the best evidence that the digestive system and the muscular system work together to carry out their functions?
what happens when light is not spread out
Answer:
Spreading out a wave over a larger area just causes the wave strength to weaken, but does not cause gaps to form. Therefore, if you look at photons as waves, spatial gaps never form in light as it travels through free space, no matter how dim it gets.Spreading out a wave over a larger area just causes the wave strength to weaken, but does not cause gaps to form. Therefore, if you look at photons as waves, spatial gaps never form in light as it travels through free space, no matter how dim it gets
Explanation:
Which of these conclusions is correct about P and Q in the diagram?
P represents the land and Q represents the ocean.
P represents the ocean and Q represents the land.
P represents the land and Q represents the atmosphere.
P represents the atmosphere and Q represents the ocean.
Answer:
P represents the atmosphere and Q represents the ocean.
Explanation:
Which answer gives both a positive impact and a negative impact associated with the effects of nitrogen- and phosphorus-enhanced fertilizers?
A- increased algal blooms and damage to drinking water
B- increased plant growth and damage to drinking water
C- increase in denitrifying bacteria and increase in plant growth
D- increase in a limiting resource and increase in denitrifying bacteria
Answer:
The answer is B
Explanation:
Answer:
Which answer gives both a positive impact and a negative impact associated with the effects of nitrogen- and phosphorus-enhanced fertilizers?
1. increased algal blooms and damage to drinking water
Right Answer 2. increased plant growth and damage to drinking water
3. increase in denitrifying bacteria and increase in plant growth
4. increase in a limiting resource and increase in denitrifying bacteria
Explanation:
The Sun is a constant supply of energy to Earth.
A. True
B. False
(02.02 MC)
How is Earth's surface most likely to change in a place that experiences strong sand storms?
Answer:
Mechanical weathering will cause wearing down of rocks.
Explanation:
All the other choices aren't suitable for a dry climate where sand storms occur.
A 0.050L solution of Ba(OH)2 is neutralized by 0.072L of a 0.55 M HNO3 solution. What is the concentration of the Ba(OH)2 solution?
Answer:
0.396M
Explanation:
Step 1:
The balanced equation for the reaction. This is given below:
2HNO3 + Ba(OH)2 —> Ba(NO3)2 + 2H2O
From the balanced equation above,
The mole ratio of the acid (nA) = 2
The mole ratio of the base (nB) = 1
Step 2:
Data obtained from the question. This include the following:
Volume of base (Vb) = 0.05L
Concentration of base (Cb) =..?
Volume of acid (Va) = 0.072L
Concentration of acid = 0.55 M
Step 3:
Determination of the concentration of the base, Ba(OH)2.
The concentration of the base, Ba(OH)2 can be obtained as follow:
Cava /CbVb = nA/nB
0.55 x 0.072 / Cb x 0.05 = 2/1
Cross multiply to express in linear form
Cb x 0.05 x 2 = 0.55 x 0.072
Divide both side by 0.05 x 2
Cb = (0.55 x 0.072) / (0.05 x 2)
Cb = 0.396M
Therefore, the concentration of the base, Ba(OH)2 is 0.396M
What does the questions “how much?” and “how many?” have in common?
If a body was lying on their back when they died, and was moved to their front after 12 hours, where would one see the skin discoloration from pooling blood?
Answer:the parts of the body which is nearest to the ground ie thier back will show discoloration
Explanation:
If the body remains at a position for long hours, the parts of the body which is nearest to the ground can develop a skin discoloration as a result of pooling of blood in the tissues and this is called livor mortis, which tends to be permanent from 8Hours upwards.
1. Calculate the molarity of 35g of calcium chloride (CaCl2) that is dissolved in 850ml of water. (Calculate moles first)
a. 0.27M
b. 0.38M
c. 0.32M
d. 0.80M
2. Calculate the molarity of 90g of copper sulfate (CuSO4) when dissolved in 5 L of water.
a. 0.112M
b. 2.8M
c. 0.56M
d. 0.50M
3. What is the molarity of NaOH if 0.70 moles are dissolved in 250 ml of water?
a. 175,000M
b. 2.8M
c. 0.175M
d. 4M
4. How many moles of Lithium oxide (Li20) are in 2 L of solution with a molarity of 2.0M?
a. 1 mole
b. 2 moles
c. 0.2 moles
d. 4 moles
5. How many moles of NaCl are in 7.5 L of 0.5M?
a. 3.75 moles
b. 15 moles
c. 0.066 moles
d. 2.5 moles
Answer:
yo I got same question do u know it
Which of the following did Antoine Lavoisier correctly characterize as an element? light silicone dioxide mercury
Answer: mercury
Explanation: I looked up the answer to your question.
Answer:
Mercury
Explanation:
I did this question and I got it right.
A child has a balloon in his house in the air conditioning. He goes outside with the balloon on a hot day. What happens to the temperature of the gas and volume of the balloon?
Answer:
There would be an increase in temperature and corresponding increase in the volume of the balloon
Explanation:
Charles law is been here
Charles law states that the volume of a given mass of gas is directly proportional to the temperature in Kelvin, provided that the pressure on the gas is kept constant. Mathematically Charles law can be represented thus;
V∝ T
Where V is the volume of the gas and;
T is the temperature.
Relating Charles Law to the question
The child moved outside from the room, constant atmospheric pressure is maintained.The temperature of the room is lower than the temperature outside.From Charles law postulation, there would be an increase in volume because of the increased temperature, since our pressure is same.
what is the diffrence between displacement ans double displacement reactions write equations for these reactions
Answer:
Single Displacement reaction
In a displacement reaction, a more reactive element replaces a less reactive element from a compound.
Change in colour takes place with no precipitate forms.
Metals react with the salt solution of another metal.
Examples:
2KI + Cl2 → 2KCl + I2
CuSO4 + Zn → ZnSO4 + Cu
Double displacement reaction
In a double displacement reaction, two atoms or a group of atoms switch places to form new compounds.
Precipitate is formed.
Salt solutions of two different metals react with each other.
Examples:
Na2SO4 + BaCl2 → BaSO4 + 2NaCl
2KBr + BaCl2 → 2KCl + BaBr2
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What Newton’s law is this a example of:
When a bullet is fired from a rifle through a small explosion. The rifle shooting the bullet is pushed backwards after the explosion.
Answer:
Newton's third law
Explanation:
every action has an equal and opposite reaction.
Answer the questions using the drop-down menus.
Which is the independent variable in this experiment?
Which is the dependent variable in this experiment?
Which is a controlled variable in this experiment?
In the experiment to measure the heat absorbed by a material placed in
the Sun, we have;
The independent variable is either the angle of insulation or the type of materialThe dependent variable is the temperature of the materialThe controlled variable is the type of material when the angle of insulation is the independent variable and vice versaWhat differentiates the given experimental variables?The possible experiment is with regards to the factors that influence energy from the Sun
The factors investigated are;
The type of material and the angle of lighting (insulation) affects the absorption of heat
The independent variable is the variable that is the cause of the effect
measured in the experiment.
It is the variable that the researcher has control over or controls and
varies during the experiment to produce the measured effect.
In the above experiment, the independent variable are either ;
The angle of insulation or the type of material respectivelyThe dependent variable is the variable that is under test or that is being measured.
In the above experiment the dependent variable is the temperature of the material which can be measuredThe controlled variable is the variable that remains the same or is held
constant during the experiment and can be used as reference to
compare the dependent variable.
In the experiment, the controlled variable are either;
The type of material when the angle of insulation is the independent variable or vice versaLearn more about independent and dependent variables here:
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Answer:
angle of light
temperature of material
type of material
Explanation:
E d g e 22 !
HELP PLEASE I WILL GIVE 100 PONTS
All of the following properties of a solution would decrease if you increased the concentration of solute, EXCEPT which?
A. freezing point
B. boiling point
C. vapor pressure
D. they would all decrease
Answer:
boiling point
Explanation:
What volume of oxygen gas at 20°C and 0.919 atm is
consumed in the production of 5.00 g of iron(III) oxide from
metallic iron?
4Fe(s) + 302(g) → 2Fe2O3 (9)
LO2
Answer:
Volume of oxygen gas is 78.47L
Explanation:
Data;
Temperature (T) = 20°C = (20 + 273.15)K = 293.15K
Pressure (P) = 0.919atm
Mass (m) = 5g
Volume (v) = ?
Equation of reaction;
4Fe + 3O₂ → 2Fe₂O₃
From the equation of reaction, the number of moles of oxygen is 3.
To find the volume of oxygen produced, we'll have to use ideal gas equation
PV = nRT
P = pressure
V = volume
n = number of moles
R = ideal gas constant = 0.082J/mol.K
T = temperature of the ideal gas
PV = nRT
V = nRT/ P
V = (3 × 0.082 × 293.15) / 0.919
V = 72.1149 / 0.919
V = 78.47L
Volume of the gas is 78.47L
Explain on any two materials that you would expect to use for the wheelchair (both back support and
arm support) with less generation of heat during the hot summers.
Answer:
In the backrest use materials where it is easy to clean and where they do not absorb fluids, in this way it would be cooler, such as an ecological leather simulator.
And in the armrest as well, but in both areas we must not rule out that if or if it should have even a minimum of padded surface so that the patient or the person who spends most of the day in the wheelchair does not suffer from joint pain.
Explanation:
Some wheelchair factories also implement modern chairs where they are made of stainless steel structures lined with padded material with perforated fabrics that allow breathing and aeration of body areas that have contact with the fabric.
How many senses does the human body have?
O A. 3
B. 5
Answer:
B
Explanation:
sight, hearing, smell, taste and touch
Answer:
Most easiest answer..
There are 5 senses in human body.☺️
Whats the answer to 7/2 × 1/5?
Answer:7/10
Explanation:multiply top and bottom
Leon made a study chart about human-induced changes to
the environment.
Which headings best complete the chart?
Environmental Changes Caused by Humans
X: Habitat Destruction
Y: Pollution
Y
Results from
introducing harmful
substances into the
Results from natural areas
being cleared and replaced
by human development
© X: Long-Term Changes
Y: Short-Term Changes
X: Short-Term Changes
Y: Long-Term Changes
0 X: Pollution
Y: Habitat Destruction
environment
Example: deforestation
Example: oil spill
The question was not well arranged above. It has been arranged in the answer below.
Question:
Leon made a study chart about human-induced changes to the environment.
Environmental Changes Caused by Humans
X Y
Results from introducing harmful substances into the environment
Example: oil spill
Results from natural areas being cleared and replaced by human development
Example: deforestation
Which headings best complete the chart?
X: Habitat Destruction
Y: Pollution
X: Long-Term Changes
Y: Short-Term Changes
X: Short-Term Changes
Y: Long-Term Changes
X: Pollution
Y: Habitat Destruction
Answer:
X: Pollution
Y: Habitat Destruction
Explanation:
From the above question, Leon gave us two variables, X and Y.
The human induced changes were divided into two.
1. Results from introducing harmful substances into the environment
Introducing harmful substances into the environment is also called pollution. And we can represent this as X which is the first variable.
2. Results from natural areas being cleared and replaced by human development.
This description given in number two above whereby land areas are been cleared and replaced by human development has a negative effects on the environment because the vegetation which includes the trees are been cut down and living organisms(animals) will go extinct gradually. This act affect the balance of the ecosystem and it can be referred to as the destruction of the habitat of living organisms
Therefore, the correct headings best complete the chart is :
X: Pollution
Y: Habitat Destruction
Answer:
what the top person said
Explanation:
☺
What is an example of a polyatomic ion
Answer: The hydroxide cation (OH -) and the phosphate cation (PO 4 3-) are both polyatomic ions.
Explanation:
Answer:
OH - and PO 4 3- are both polyatomic ions
What organelle does the process of cellular respiration?
Answer:
Mitochondria
Explanation:
The mitochondrion is the site of cellular respiration. The first part of cellular respiration (glycolysis) happens in the cytoplasm. The second part of cellular respiration needs oxygen, and it occurs in mitochondria.
Calculate the molar mass of ammonium chloride
Answer:
53.491 g/mol
Explanation:
Create the chemical compound and find each individual element's molar mass. Lastly, add them up.
Addition of _____________ to pure water causes the least increase in conductivity
organic molecules
because organic molecules does not dissociate in water
Analysis: The limiting reactant(s) appeared to be
because
there is nothing with which it can react
Explanation:
The limiting reactant(s) prevents a reaction from continuing because there is none left.
Why do limiting reactants occur?Identification of the limiting reactant makes it possible to calculate the theoretical yield of a reaction. The reason there is a limiting reactant is that elements and compounds react according to the mole ratio between them in a balanced chemical equation.
How do you get the limiting reactant?The reactant that is consumed first and limits the amount of product(s) that can be obtained is the limiting reactant. To identify the limiting reactant, calculate the number of moles of each reactant present and compare this ratio to the mole ratio of the reactants in the balanced chemical equation.
Learn more about Limiting Reactant(s) here
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What pH does an acid have?
Answer:
The pH scale ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic
Explanation:
