Answer:
Density, [tex]d=2.09\ g/cm^3[/tex]
Explanation:
Given that,
Mass of a flask is 450 g
Volume of benzene added to the flask is 145 mL or 145 cm³
The weight of the flask and benzene is found to be 754 g.
We need to find the density of the benzene.
Weight of benzene added = total weight of flask and benzene-mass of flask
m = 754 g - 450 g
m = 304 g
Density = mass/volume
So,
[tex]d=\dfrac{304\ g}{145\ cm^3}\\\\d=2.09\ g/cm^3[/tex]
So, the density of the benzene is [tex]2.09\ g/cm^3[/tex].
Plz I need help is the 2nd time I post this
Answer:
2--->C
6---->E
3---->D
4--->A
5--->B
1---->F
Explanation:
I think so, sorry if its wrong.
PLEASE HELP
Which conducts heat more efficiently- a solid, liquid or gas? Why is that (explain on molecular level)?
Answer
solids conduct heat more efficiently ! basically their particles are more tightly packed and stay in that position, so the heat transfer by collision allows for the best conduction
Explanation:
hope this helps ! :)
12. The following represents two substances by showing only one molecule 1 point
of each substance. A chemical reaction occurs when hydrogen chloride
and sodium hydroxide are combined. Which of the following represents the
molecules that are the products of the chemical reaction?*
A.
B.
C.
D
Answer:
b
Explanation:
etbhte4bt4ebhgetbv
What are the four most important elements on earth?
hellum
carbon
water
nitrogen
O oxygen
hydrogen
Answer:
These four atomic elements are oxygen, carbon, hydrogen, and nitrogen.
Explanation:
hope it helps....
Answer:
Nitrogen/Carbon/Oxygen/Hydrogen
Explanation:
I believe those would be the most important because:
Nitrogen - Composing 78% of earths atmosphere.
Carbon - Building blocks for all known life.
Oxygen - We breath it as well as it composes 21% of our atmosphere.
Hydrogen - Makes up a bunch of compounds (like water) that enable humans to live.
How do you accurately describe a electron?
Answer:
I would say voting. I hope that helped or just report my comment.
Explanation:
what is the mass of 5.0mol of NaOh
Answer:
200 g NaOH
General Formulas and Concepts:
Reading a Periodic TableDimensional AnalysisExplanation:
Step 1: Define
5.0 mol NaOH
Step 2: Define conversions
Molar Mass of Na - 22.99 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of NaOH - 22.99 + 16.00 + 1.01 = 40 g/mol
Step 3: Convert using DA
[tex]5.0 \ mol \ NaOH(\frac{40 \ g \ NaOH}{1 \ mol \ NaOH} )[/tex] = 200 g NaOH
Step 4: Check
We are given 2 sig figs. Follow sig fig rules.
We only have 1 sig fig in 200. No need to round.
Heat being transferred from a hot pan to our food while cooking is an example of... *
conduction
convection
radiation
transpiration
A.conduction i hope it helps
Answer:
conduction
Explanation:
Why is DNA important in living organisms?
Answer:
DNA is a vital for all living beings even plants.
Explanation:
It is important for inheritance, coding for proteins and the genitic instruction guide for life and its processes. DNA holds the instruction for an organisms or each cells development and reproduction and ultimately death.
Which of the following contains the most atoms?
24.305 g Mg
39.098 gk
21.62 g B
9.0122 g Be
Explanation:
9.0122 g be Maybe, sorry i don't think so
In the above , the sample of B 21.62 g of boron contains the most atoms because it has approximately 2 moles, while the other samples have only 1 mole each.
What is atomsThe molar mass of each element can be found on the periodic table.
The molar mass of Mg (magnesium) is about 24.305 g/mol.The molar mass of K (potassium) is about 39.098 g/mol.The molar mass of B (boron) is approximately 10.81 g/mol.The molar mass of Be (beryllium) is about 9.0122 g/mol.To calculate the number of moles in each sample, we divide the mass of each sample by its respective molar mass:
For Mg: Number of moles = 24.305 g / 24.305 g/mol = 1 moleFor K: Number of moles = 39.098 g / 39.098 g/mol = 1 moleFor B: Number of moles = 21.62 g / 10.81 g/mol ≈ 2 molesFor Be: Number of moles = 9.0122 g / 9.0122 g/mol = 1 moleTherefore, the sample with 21.62 g of boron (B) contains the most atom
Read more about atoms here:
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Most solid solutes will dissolve ___ at ___ temperatures
A. slower, higher
B. faster, higher
C. faster, lower
Answer:
B
Explanation:
The increase in kinetic energy that comes with higher temperatures allows the solvent molecules to more effectively break apart the solute molecules that are held together by intermolecular attractions.
Water is added to a test-tube containing dilute NaOH of pH 11. What could be the pH of the resulting solution?
Answer:
NaOH atomic mass is 39.977
pH is 11 due to dilution must be multiplied by 0.11 to find pH
39.977 x 0.11 = 0.43979 x 100%
43% pH
In order for sodium to have 8 valence electrons it would need to either gain _____ electrons or lose _____ electron.
Answer:
7
Explanation:
sodium has 1 valence electron because of its place on the periodic table. a trick to use is included in the picture below to find out how many valence electrons an element has. to get from 1 to 8 we add 7.
I hope this helps :))
An element X that has 15 protons and 15 electrons, loses three
electrons to form an ion.
What will be the charge on the ion?
What will be the number of protons and electrons in the ion?
Answer:
+3
12 electrons and 15 protons.
Explanation:
The element having 15 electrons and 15 protons have atomic number 15. We know that when an atom lose or gain the electron ions are formed.
Anion formation:
Anion is formed when electron is accept by an atom.
X + e⁻ → X⁻
Cation formation:
Cation is formed when electron lose be an atom.
X → X⁺ + e⁻
The given atom loses 3 electrons thus oxidation number will be +3 and cation is formed.
X → X³⁺ + 3e⁻
Now element X have 15 protons and 12 electrons.
CO2 is a ____________________
Group of answer choices
1.compound
2.element
3.mixture
4.solution
Answer:
CO2 is a compound
hope it helps
can someone tell me the answer
Which of the following quantum leaps would be associated with the greatest energy of emitted light? n = 2 to n = 5 n = 5 to n = 4 n = 5 to n = 1 n = 4 to n = 5
Answer: I think it’s n=5 to n=1
Explanation:
The greatest energy has been emitted with the radiation of the quantum leap associated with n=5 to n=1. Thus, option C is correct.
Quantum leaps have been the atomic orbitals that has been holding the electrons. The orbitals have been arranged with the increasing order of the energy.
The atoms has been required to gain energy in order to jump from the lower energy level to the higher energy level. There has been the emission of the radiations when the atoms have been returned from the excited state to the ground state.
The energy of the emitted radiations have been maximum with the return of the electron from the higher energy level to the lowest. Thus, the greatest energy has been emitted with the radiation of the quantum leap associated with n=5 to n=1. Thus, option C is correct.
For more information about the quantum leaps, refer to the link:
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decrease in vapour pressure will cause?
A. an increase in boiling point
B. a decrease in boiling point
C. no effect
Answer:
A. an increase in boiling point
Explanation:
A decrease in vapor pressure will cause an increase in the boiling point of a substance.
An increase in vapor pressure will decrease the boiling point.
Vapor pressure is a measure of the tendency of a liquid to change into gaseous form. The boiling point is the temperature at which the vapor pressure equals the atmospheric pressure. When vapor pressure reduces, there would be an elevation of the boiling point. This is why pressure cookers causes water to boil faster because they lower the boiling point.Ajay bought bottle that was labelled as distilled water. He suspected it to be tap water. What test he could use without adding any chemical in it to find out for sure?
Answer:
Ajay should pass electric current through the water and connect a bulb to the circuit. If the bulb glows, it means that the water is tap water or else, it is distilled water.
Explanation:
This is because tap water contains little impurities like ions of some salts etc., which help in the conduction of electricity. But, distilled water is pure water and doesn't have any ions present in it. So, it doesn't conduct electricity.
Hope this helped
Ajay can test the distilled water by performing the electricity conduction test.
Distilled water has been the water that has an absence of ions and electrolytes. It has been a poor conductor of electricity.
The tap water has been constituted with minerals, electrolytes, and impurities, which results in the addition of conductivity to the water.
To test whether the water has been distilled or not, the circuit test can be performed The water has dipped wires connected with a battery and a bulb. the distilled water is a poor conductor did not allow the bulb to glow. However, with tap water bulb glow.
Thus, to test the water to be distilled or tap, the electricity conduction test has been performed.
For more information about distilled water, refer to the link:
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(b)Calculate the number of moles of CuSO4 that were in the impure sample of CuSO4(s) .
(c) In addition to the number of moles of CuSO4 calculated in part (b) , what other quantity must be measured in order to calculate the mass percentage of CuSO4 in the impure sample of CuSO4(s) ?
Need help now
Answer:
The questions are incomplete
Explanation:
(b) This question is incomplete. However to calculate the number of moles of CuSO₄ present in the impure sample. The formula below can be used;
number of moles = mass of CuSO₄ present in the impure sample ÷ molar mass of CuSO₄
(c) This question is also incomplete. However, to calculate the mass percentage of CuSO₄ present in the impure sample of CuSO₄, the formula below can be used.
Mass percentage of CuSO₄ =
mass of CuSO₄ present in the impure sample/mass of impure CuSO₄ × 100
Thus, the mass of the impure sample must be measured also since the actual mass of the CuSO₄ present in the impure sample must have been measured before calculating the number of moles.
Which of these is a molecular ingredient that could be used in a wall-filling material ?
C6H6
Na6Ba6
NeNa
HCl
Answer:
C6H6 is the appropriate answer.
Explanation:
Answer:
c6h6
Explanation:
What does one mole of H2O correspond to?
A.
6.02 × 1023 molecules of H2O
B.
6.02 × 1023 atoms of H and 6.02 X 1023 atoms of O
C.
6.02 × 1023 atoms of O
D.
6.02 × 1023 atoms of H
E.
6.02 × 1023 × 2 atoms of H
Answer:
Its A
Explanation:
Just took the test and got a 100%
Help fast... thanks I’ll give you brainliest
Answer:
Graph E matches description 3 (the car is accelerating).
Explanation:
When the graph increases, the line is turned up (graph E). So when something accelerates, it is going to increase. In this case, it would increase by speed.
i need to know what word goes into that the words are in each sentence plz help me i will give brainliest thank you :)
Answer:
im taking these points baby lol
Explanation:
i love you <3
The purpose of copper chloride and water. Please answer !!!!!!!!!!!!!!!!!! Will mark Brianliest !!!!!!!!!!!!!!!!!!!!!!!!
What volume do 4.96 moles of O2 occupy at STP?
Answer: Step 1: List the known quantities and plan the problem. Known. 4.96 moles O2; 1 mol = 22.4
Explanation: I hope that helped.
How many moles would there be in 500,000,000,000 atoms of silver? Show your calculation
and answer in unit
Answer: 3.01 * 10^35
Explanation:
500,000,000,000 * 6.02 * 10^23
There are 3 [tex]\rm \times\;10^3^5[/tex] moles of silver present in the 500,000,000,000 atoms of silver.
According to the concept of molar mass:
1 atom = [tex]\rm 6.023\;\times\;10^2^3[/tex] moles
500,000,000,000 atoms of silver can be written as:
5 [tex]\rm \times\;10^1^1[/tex] atoms of silver.
1 atom = [tex]\rm 6.023\;\times\;10^2^3[/tex] moles
5 [tex]\rm \times\;10^1^1[/tex] atoms = 5 [tex]\rm \times\;10^1^1[/tex] [tex]\times[/tex] [tex]\rm 6.023\;\times\;10^2^3[/tex] moles
5 [tex]\rm \times\;10^1^1[/tex] atoms = 30.115 [tex]\rm \times\;10^3^4[/tex] moles
= 3 [tex]\rm \times\;10^3^5[/tex] moles.
The moles of silver are present in the 500,000,000,000 atoms of silver are 3 [tex]\rm \times\;10^3^5[/tex] moles.
For more information about mole, refer the link:
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explain the coin and feather experiment. what conclusion can be drawn from experiment
In a vacuum, the objects fall at the same rate independent of their respective masses. That means coin and feather both reach the ground at the same time in a vacuum. Larger objects experience more air resistance than smaller objects. Also, the faster an object falls, the more air resistance it encounters.
Note:
hope this helps
which of the following actions would cause the volume of the chamber below to increase to 36.0 L?
Answer:
Option C. Triple the number of moles
Explanation:
From the ideal gas equation:
PV = nRT
Where:
P is the pressure
V is the volume
n is the number of mole
R is the gas constant
T is the absolute temperature.
Making V the subject of the above equation, we have:
PV = nRT
Divide both side by P
V = nRT / P
Thus, we can say that the volume (V) is directly proportional to both the number of mole (n) and absolute temperature (T) and inversely proportional to the pressure (P). This implies that and increase in either the number of mole, the absolute temperature and a decrease in the presence will cause the volume to increase.
Thus, the correct option is option C triple the number of moles. This can further be seen as illustrated below:
Initial volume (V1) = 12 L
Initial mole (n1) = 0.5 mole
Final mole (n2) = triple the initial mole = 3 × 0.5 = 1.5 mole
Final volume (V2) =?
From:
V = nRT / P, keeping T and P constant, we have:
V1/n1 = V2/n2
12/0.5 = V2/1.5
24 = V2/1.5
Cross multiply
V2 = 24 × 1.5
V2 = 36 L.
Thus Option C gives the correct answer to the question.
Which piece of laboratory equipment would be most helpful for measuring small amounts of a solution in the laboratory?
A. 300 mL flask
B. Micropipette
C. 500 mL graduated cylinder
D. 500 mL beaker
Answer:
500 mL graduated cylinder
Explanation:
it is used for small liquids
An element found in groups 3-12 of the periodic table is classified as a[n]
Answer:
Transition Metals
Explanation:
Hope this helped :)
