Answer:
The grams of sodium chloride that will be made is 292.5 g. calculation. 2Na + Cl₂ → 2NaCl. step 1: calculate the moles of Na. moles = mass/molar mass. From periodic table the molar mass of Na = 23 g/mol. moles = 115 g/23 g / mol = 5 moles. Step 2 : use the mole ratio to determine the moles of NaCl. Na:NaCl is 2:2 = 1:1 therefore the moles of NaCl is also = 5 moles.
Explanation:
We know sodium is a very active metal and chlorine is also a very reactive non-metal. Usually, metals like to eliminate electrons and non-metals such as halogens like to accept electrons. Sodium readily eliminate its last shell electrons become Na+ cation and chlorine accepts that electron to form Cl-anion.
3. 7moles of Ba(NO3)2 is dissolved in 75kg of distilled water.
What is the boiling point of this solution? Hint: Find molality first.
Answer:
100.14°C
Explanation:
The boling point elevation is a colligative property that describes the increasing in boiling point of a solution regard to the boiling point of the pure solvent. The equation is:
ΔT = Kf*m*i
Where ΔT is boiling point elevation
Kf is boiling point elevation (0.51°C/m for water)
m is molality of the solution (7moles Ba(NO3)2 / 75kg = 0.09333m
i is Van't Hoff factor = 3 for Ba(NO3)2 (Because its dissolution produce 3 ions = Ba²⁺ and 2 NO₃⁻
Replacing:
ΔT = 0.51°C/m*0.09333m*3
ΔT = 0.14°C is the boiling point elevation
As the boiling point of water is 100°C, the boiling point of the solution is:
100°C + 0.14°C =
100.14°C
A decrease in the height of the mercury column usually means the coming of a.
Answer:
Low-pressure system and clear weather.
Explanation:
(10 POINTS!!!!!!!!!!!
What environmental change will take place when harmful substances get into the food and water supply of animals or plants?
A Climate change
B Increased predators
C Lack of food
D Pollution
need asap
Answer:
A climate change
Explanation:
the surrounding area would be effected in all ways imaginable, such as change in air, soil, water, plants, animals. and if you eat those said animals those harmful things can transfur into you
How many energy levels does an atom of carbon have?
Answer:
6
Explanation:
please helpppp!!!!!!!!!!!
Answer:
If a substance can be dissolved it is called soluble.
if a substance cannot be dissolved it is called insoluble
what does the period number on the periodic table tell us?
Answer:
The period number on the Periodic table tells you the total number of orbits that the atom will have. In other words, the period number indicates the number of energy levels (or energy orbit) of an atom. For example, 1st period indicates that these elements possess 1 energy shell (or energy orbit).
Explanation:
what are organisms competing for in the environment?
Answer:
survival
Explanation:
Organisms actually compete for food , water and slot but all this things lead to survival . so organisms are actually competing for survival
in calorimetry, energy is measured through heat transfer from one substance to another. Which of the following is NOT a method of heat transfer?
Answer:
Explanationconvection
:
In calorimetry, energy is measured through heat transfer from one substance to another. Convection is not the method of heat transfer.
What is a calorimeter?A calorimeter is a device used to measure the amount of heat involved in a chemical or physical process.
For example, when an exothermic reaction occurs in solution in a calorimeter, the heat produced by the reaction is absorbed by the solution, which increases its temperature.
One technique we can use to measure the amount of heat involved in a chemical or physical process is known as calorimetry.
Calorimetry is used to measure amounts of heat transferred to or from a substance.
To do so, the heat is exchanged with a calibrated object (calorimeter).
Heat loss due to conduction is prevented by placing the calorimeter box in a well-lagged vessel using wool or cork material.
Heat loss due to convection is prevented by placing a lid on the box.
Heat loss due to radiation is minimized by polishing the box in order to smoothen it.
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Ethanol absorbs more energy than water because it has a lower heat capacity
True or false?
Owing to the fact that ethanol has a lower heat capacity than water then it certainly absorbs less energy than water.
What is heat capacity?The term heat capacity refers to the quantity of heat that can be required to raise the temperature of a substance by 1 K. We must note that the higher the heat capacity of a substance, the higher the quantity of heat that is required to raise the temperature of the substance by 1K.
Now, since ethanol has a lower heat capacity than water then it certainly absorbs less energy than water.
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calculate the mass of 0.8 moles of Fe(NO3)3 (H2O)9
Answer:
Molar mass of (Fe(NO3)3)(H2O)9 is 403.9972 g/mole
Explanation:
the formula to find the mass of moles
Worked Example: molar mass = mass ÷ moles (M=m/n) Calculate the molar mass of a pure substance if 1.75 moles of the substance has a mass of 29.79 g.
i think it help you
Balance :FeCl3 + __Ca(OH)2 → ___ Fe(OH)3 + __ CaCl2
A tactic used by investigators to identify deceit is to ask the suspect to recount their alibi backwards. True False
Answer:
It is True.
Explanation:
Investigators use this tactic to see if the suspect is recalling by memory and if they will change their story after being asked to recall backwards.
Answer:
True
Explanation:
Correct on the test
Here anwser questions 2 ,4,6 those charts okay I also put how the formula on top solve these problems ! Please help me I geniunuly don’t understand this concept if you do I will mark you brainliest I don’t understand :( ! please don’t scam me I’m helpless
Answer:
39.5L
Explanation:
When writing the formulas for a compound that contains a polyatomic ion, ... ?
Answer:
The cation is written first in the name; the anion is written second in the name. Rule 2. When the formula unit contains two or more of the same polyatomic ion, that ion is written in parentheses with the subscript written outside the parentheses.
When writing the formula of a compound that contains polyatomic ion, the metal is written first followed by the central atom in the ion and then other atoms that surround the central atom.
A poly atomic ion refers to an ion that comprises of more than one atom. Such ions are common in chemistry. Examples of polyatomic ions include; PO4^3-, BH4^- etc.
When writing the formula of a compound that contains a polyatomic ion, the metal is written first then the central atom in the ion follows before other atoms that surround the central atom in the ion.
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I will give brainliest to the correct answer. Please answer soon!! Thank you!
If I contain 0.190 moles of gas in a container with a volume of 6.0 liters and at a temperature of 354.0 K, what is the pressure inside the container?
Answer:
0.92 atm
Explanation:
Assuming this is the ideal gas law, PV = nRT. Plug in the values for each.
P = unknown
V = 6.0 L
n = 0.190 moles
R = 0.0821 (there are other rates of constant, such as 8.31, 62.4, but match it up to the correct units! 8.31 will answer in units of kPa and 62.4 will answer in units of mmHg, and lastly 0.0821 answers in atm.)
T = 354.0 K
Set up your equation.
P(6) = 0.190(0.0821)(354)
6p = 5.522046
Divide.
p = 0.920341...
Answer: 0.92 atm
Hope this is right!
If the actual concentration of the HCl was 0.33M what is your percent error?
Answer:
The appropriate solution is "6.818".
Explanation:
The given value is:
Concentration of HCl (Actual value),
= 0.33 M
Concentration of HCl (Experimental value),
= 0.3515 M
Now,
The percentage error (%) will be:
= [tex]\frac{Experimental \ value-Actual \ value}{Actua \ value}\times 100[/tex]
On substituting the given values, we get
= [tex]\frac{0.3532-0.33}{0.33}\times 100[/tex]
= [tex]\frac{0.0225}{0.33}\times 100[/tex]
= [tex]0.06818\times 100[/tex]
= [tex]6.818[/tex]
The decomposition of potassium chlorate, KClO3, is used as a source of oxygen in labs.
How many moles of potassium chlorate are needed to produce 6.83 moles of oxygen gas?
Reaction takes place is
2KClO3 --> 2KCl + 3O2
from above equation 2 moles of potassium chlorate is forming 3 moles of Oxygen gas.
now given 6.83 moles of oxygen and moles of potassium chlorate is missing,
consider x moles of potassium chlorate are needed to form 6.83 moles of oxygen
from above condition, .
3 》》》》2
x 》》》》6.83
3/x = 2/6.83
x = 3×6.83/2
x= 10.245
Answer- 10.245 moles of potassium chlorate are needed to produce 6.83 moles of oxygen gas.
Which statement is true about the rotational period of the moon?
greater than the revolution period around Earth
always changing
less than the revolution period around Earth
equal to the revolution period around Earth
The statement is true about the rotational period of the moon " the rotational period of the moon is equal to the revolution period around Earth."
What is rotational period?A celestial object's rotation period may relate towards its sidereal rotation period, which is the time it takes for the object to complete one revolution around in its axis of rotation in sidereal seems like to the background stars.
What is revolution period?The orbital period is also known as the revolution period. it takes for one astronomical object to complete one cycle around another. It refers to planets and asteroids orbiting the Sun, moons orbiting planets, planetary systems orbiting other stars, or double stars in astronomy.
What is moon?In the night sky, the moon is just the brightest object. The moon doesn't at all produce its own light. It has no radiance. That is visible because the sun's light bounces off of it.
The rotational period of the moon is equal to the revolution period around Earth because the moon's rate of spin becomes tidally locked to its rate of revolution, it maintains the same face oriented towards the Earth In other words, every time the moon rounds the Earth, it rotates exactly once.
Therefore, the rotational period of the moon is equal to the revolution period around Earth will be correct answer.
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A chemist observed bubbling and fizzing after adding an acid solution to a
white powdery substance in a beaker. Which of the following can be
inferred?
Answer:
a chemical reaction occured
Explanation:
bubbling and fizzing after adding a substance, most offten means a chemical reaction is happening
NEED HELP!!! PLEASE, AND THANK YOU!!! ^^ <3
A patient is in the emergency room for the fifth time in one month. He has rosy cheeks and feels warm. The patient weighs 187 pounds, and his heart rate is 72 beats per minute. Which is qualitative data about the patient?
A- heart rate of 72 beats per minute
B- weight of 187 pounds
C- rosy cheeks and feels warm
D- fifth visit to the emergency room
Answer:
B
Explanation:
Help asap please.
NO LINKS!!!!!
Will mark as the brainliest.
Answer:
The answers to your questions are given below below
Explanation:
1. The calculation will require multiple steps because the unit of measurement of the theoretical and actual yield is different.
2. Determination of the percentage yield.
We'll begin by converting 6733 mg to g. This can be obtained as follow:
1000 mg = 1 g
Therefore,
6733 mg = 6733 mg × 1 g / 1000 mg
6733 mg = 6.733 g
Finally, we shall determine the percentage yield. This can be obtained as follow:
Theoretical yield = 14.79 g
Actual yield = 6.733 g
Percentage yield =?
Percentage yield = Actual yield /Theoretical yield × 100
Percentage yield = 6.733 / 14.79 × 100
Percentage yield = 673.3 / 14.79
Percentage yield = 45.5%
NO FILES PLZ HELP
Which of the following statements describes a chemical change?
Select one:
a. A gas is given off when a liquid boils.
b. A new substance is formed with different properties.
c. A solid dissolves in a liquid.
O d. A solid forms when a liquid freezes.
Is there a relationship between the locations of earthquake, volcanoes, and plate boundaries? If so, describe the relationship.
Answer:
and earthquake epicenters are related to tectonic plate boundaries. causes Earth's plates to move. Most volcanoes and earthquakes are caused by the motion and interaction of Earth's plates. The way Earth's plates interact at boundaries is an important factor in the locations of earthquakes and volcanoes
Explanation:
Help calculate the density and please type it like this and explain how you got the answer thanks
Mass:
Volume;
Density:
Answer: 2.5
Explanation:
density= 2.5
mass= 62.5 or 62.50
volume= 25 ( 75-50= 25)
so divide 62.5( or 62.50) by 25 which will led you to 2.5
Many electrical power plants use fossil fuels, a non-renewable resource to produce electricity?
A:Solar energy can be used to push energy along power lines
B:Wind energy can be used to cool overheated electrical lines
C:Moving water can be used to carry electricity to homes and businesses
D:Biomass can be used to generate heat that can be converted into electricity
Answer:
Explanation:
Thermal Power Plants generate electricity by converting heat into electricity, essentially by burning a fuel. ... A coal power plant works in much the same way, but instead of a nuclear reactor heating water to make steam, the heat from the burning coal powers a steam turbine
Answer:
Solar energy can be used to push energy along power lines.
Explanation:
Im Might be wrong, might have to fact check it but im taking the test now so :)
Given the equation below, determine the number of moles O2 required to completely react with 28 moles of CO.
Answer:
14 moles of O₂
Explanation:
The reaction between CO and O₂ is the following:
CO + O₂ → CO₂
We balance the equation with a coefficient 2 in CO and CO₂ to obtain the same number of O atoms:
2CO + O₂ → 2CO₂
As we can see from the balanced equation, 1 mol of O₂ is required to react with 2 moles of CO. Thus, the conversion factor is 1 mol of O₂/2 mol CO. We multiply the moles of CO by the conversion factor to calculate the moles of O₂ that are required:
28 mol CO x 1 mol of O₂/2 mol CO = 14 mol O₂
write an example of double displacement reaction
no link plzz ,
Answer:
[tex]when \: silver \: nitrate \: solution \: is \\ \\ added \: to \: sodium \: chloride \: solution. \: \\ \\ then \: a \: white \: precipitate \: of \: silver \: \\ \\ chloride \: is \: formed \: alongwith \: \\ \\ sodium \: nitrate \: solution. \\ \\ \huge\mathfrak\purple{hope \: it \: helps..} \\ \\ [/tex]
Explanation:
Here are some examples of double displacement reaction: AgNO 3 + NaCl → AgCl + NaNO. 2NaCl + CaSO4 → Na2SO4+ CaCl. H2SO4 + 2LiOH ⇌ Li2SO4 + 2H2O.Directions: given the following pairs of words, please explain in your own words the
DIFFERENCE between them.
1) Acid and base :
2) Concentrated and diluted:
3) Neutralization and dilution :
4) Soluble and insoluble :
5) Mixture and solution :|
Answer:
acid jsh just want me there for me too I love her soooooo you know I have no money to go back home from school tomorrow morning at like midnight to go out to my in the to the population and you have to get to know what to tell u what are u
If a gas has a volume of 3.67 L and a pressure of 790 mm Hg, what will the pressure be if the volume is compressed to 2.12 L? What is the pressure in atmospheres (atm)?
Answer:
0.600
Explanation:
2.120/3.670 = 0.578 so 790*0.578 = 456.349 when converted to atm that is 456.349/760 = V2
0.600
If a gas has a volume of 3.67 L and a pressure of 790 mm Hg, the pressure if the volume is compressed to 2.12 L is 1367 mm Hg.
What is Boyle's law?The combined gas law is the law of of gaseous state which is made by combination of Boyle's law, Charle's law, Avogadro's law and Gay Lussac's law.
It is a mathematical expression that relates Pressure, Volume and Temperature.
(P1 × V1)÷T1 = (P2 × V2)÷T2
Boyle's law states that if temperature is constant then product of pressure and volume is constant.
(P1 × V1)= (P2 × V2)
Given,
P1 = 790 mm Hg
V1 = 3.67L
P2 = ?
V2 = 2.12 L
(P1 × V1)= (P2 × V2)
P2 = 1367 mm Hg
Therefore, If a gas has a volume of 3.67 L and a pressure of 790 mm Hg, the pressure if the volume is compressed to 2.12 L is 1367 mm Hg.
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The amount of heat needed to raise the temperature of 1 gram of a substance by 1°C describes
A.specific heat.
B.heat.
C,enthalpy.
D.calorimetry.
