Explanation:
6. Which type mixture does not allow light to shine through?
D) Suspensions
10. What is a closed system in chemical equilibrium?
Solution:
A closed system is a system where neither products nor reactants can escape,The heat can be only exchanged freely For Example an ice coolerThe use of closed system for conducting chemical experiment in which temperature does not affect For Example reaching thermal equilibrium-TheUnknownScientist
Finish the quote: “It’s not only about changing light bulbs, it’s about changing
Answer:
it's about changing attitudes and behavior.
What mass of NaOH is in 250 mL of a 3.0M NaOH solution
Explanation:
Explanation: It's a 3.0 M solution so 1 litre of solution contains 3 moles of NaOH. 250 ml of solution therefore contains 0.25 x 3 = 0.75 moles of NaOH. The molar mass of NaOH is 39.9971 g/mol, so 250 ml of this solution contains 0.75 x 39.9971 = 29.99 g, or if you round it up 30.0 g.
30g of NaOH is in 250 mL of a 3.0M NaOH solution.
What is Mole?
The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.
A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.
Given,
Volume of NaOH = 250 ml
Concentration = 3M
number of moles = concentration × volume (L)
= 3 × 0.25
= 0.75 moles
mass = moles × molar mass
= 0.75 × 40
= 30 g
Therefore, 30g of NaOH is in 250 mL of a 3.0M NaOH solution.
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All of the following are ways to increase the speed at which a solute dissolves into a solvent except:
A Increasing the heat of the solution
B Stirring or shaking the solution
C Freezing the solution
D Crushing the solvent into smaller pieces.
Name a compound containing oxygen and selenium.
Answer:
Selenium Dioxide: Se[tex]O_{2}[/tex]
Explanation:
This is a compound that contains both Selenium and Oxygen.
I need this question ASAP please
Answer:
Heeeeeeeeeeeeeloooooooooo
Explanation:
Four scientist collected data on the blood pressure of 30 people. Which scientist most likely had a problem with the experimental design?
Answer:
Scientist 3
Explanation:
2 moles of CaCl2 are dissolved in 0.6 liters of water. What is the molarity?
Answer:
b
Explanation:
what happen when a piece of silver metal is added to the copper sulphate solution
Answer:
Explanation:When silver Ag metal is added to copper sulphate CuSO4 solution, no reaction takes place as silver is less reactive than that of copper and cannot displace copper from its solution. Hence, when a piece of silver metal is added to copper sulphate solution there will be no reaction.
Answer:
There will be no reaction
Explanation:
Therefore, when silver Ag metal is added to copper sulphate CuSO4 solution, no reaction takes place as silver is less reactive than that of copper and cannot displace copper from its solution. Hence, when a piece of silver metal is added to copper sulphate solution there will be no reaction.
Someone said that light bent around a corner to reach an object. Is this possible?
Answer: Yes, light can bend around corners. ... The ability of light to bend around corners is also known as "diffraction". There are two mechanisms that cause light to bend around corners. Light waves indeed bend around corners because of diffraction, as shown in this illustration.
Explanation:
Help please!!! I'll name you brainliest!!
Answer:
i believe the answer is b
Explanation:
a gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide, chlorofluorocarbons, and other pollutants.
Which of the following represent Dinitrogen tricarbide
1) NC
2) NC2
3) N2C2
4) N203
Answer:
I think is nc2 that representsDoes anybody know all the parts?
Answer:
yes I know it.
Explanation:
A:positive terminal
B:cathode
C:electrolyte
D:anode
E:negative terminal
Thank you for this question
Name the Following Binary Ionic Compounds:
a. AgCl
b. ZnO
c. CaBr2
d. SrF2
Explanation:
a.Silver chloride
b.zinc Oxide
c.calcium Bromide
d.strontium difluoride
What U.S. state is directly north of Cuba?
Answer:
Florida
Explanation:
Directly north of Cuba is the rural bar fight of a state, Florida
Which statement describes a space-filling model of a molecule?
A.The radii of the atoms are represented by the symbol of the atom surrounded by dots in the
space-filling model.
B.The radii of the spheres in a space-filling model are proportional in size to the radil of the atoms
they represent
C.The radii of the atoms present in the compound determine the length of the bonds in a space-
filling model.
Answer:
Option B, In a space-filling model of a molecule, the radii of the spheres in a space-filling model are proportional in size to the radii of the atoms
they represent
Explanation:
In a space-filling model of a molecule, atoms are represented as sphere. The radius of the sphere is equal to the radius of the atom and the distance between the center of one sphere to the center of other represents the distance between the atomic nuclei
Option B is correct
Option A is incorrect, as dots are used in the space filling model to represent the atoms
Option C is incorrect because radii of atom do not represents the length of the bonds in a space- filling model
The heart works directly with which
Liver
Lungs
Kidneys
Brain
Answer:
Lungs.
Explanation:
They bring the blood throughout the body, to help it function properly
need some help with just one question please help.What is the pH of a 9.7 x 10-5 M NaOH solution? (2 formulas)
at all four positions the northern end of earths axis points towards?
Bonjour!
At all four positions, the northern end of Earth's axis points towards the Polaris. I will enter a diagram below to help you visualize!
Au revoir, hope this helped you!
Sincerely- frenchsmartie
In what areas of the country should this material be marked?
Answer:
Explanation: The goal of every country should be to produce more materials and goods
in a dry cell the electrolyte is a ______
A. solid
B. paste
C. liquid
D. gas
In a dry cell the electrolyte is a paste.
Minerals with an electric charge called electrolytes could be found in human blood and other bodily fluids. Electrolytes have a variety of effects on how your brains work, including how much water is in your body. The pH balance in the blood (pH) Our muscles work.
The dry-cell battery would be a gadget composed of one or even more electrochemical cells which change electrical energy from chemical energy that has been stored. It has an electrolyte inside of a paste or another moist substance. Zinc anode, as well as carbon cathode, are found inside a central rod of a standard dry cell battery.
Therefore, in a dry cell the electrolyte is a paste.
Hence, the correct answer will be option (B).
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The daily change from daylight to darkness is caused by:
Answer:
The daily change from daylight to darkness is caused by:the rotation of the Earth on its axis. If the Earth did not rotate as it does, the day/night cycle would be very different or possibly even nonexistent.
Explanation:
Which statement is NOT true regarding Earth's past climate?
Group of answer choices
Earth was very warm 100 million years ago
Tropical forests and swamps covered much of Earth's surface many years ago
A shallow ocean covered much of North America 450 million years ago
Earth's climate has stayed the same throughout the past
Earth climate has stayed same thougout the past
Any corrections I need to make? Please help! And provide an actual answer please! Thank you!
Answer:
nah you good
Explanation:
it's perfect don't doubt yourself
Are electron shells or orbitals actually inside the atom or are they outside of the structure of the atom?
Answer:
Electrons in atoms occupy energy levels, also called electron shells, outside the nucleus . Different shells can hold different maximum numbers of electrons. The electrons in an atom occupy the lowest available energy level first. This is the shell nearest the nucleus.
Explanation:
What’s the mass of 1.5 moles of c6h14
Answer:
[tex]\boxed {\boxed {\sf 129.267 \ g \ C_6H_{14}}}[/tex]
Explanation:
To convert from moles to mass, the molar mass is used. This is the grams per mole for a substance.
The values are found on the Periodic Table. They are the same as the atomic masses, but the units are grams per mole instead.
We are given this compound: C₆H₁₄. Look up the molar masses for the individual elements first: carbon and hydrogen.
C: 12.011 g/mol H: 1.008 g/molCheck the subscripts, which tell us the number of atoms per molecule. There are 6 carbon atoms and 14 hydrogen atoms. Multiply the molar mass by that number, then add them together.
C₆: 12.011*6=72.066 g/mol H₁₄: 1.008*14=14.112 g/mol C₆H₁₄: 72.066+14.112=86.178 g/molUse the molar mass as a ratio.
[tex]\frac {86.178 \ g \ C_6H_{14}}{1 \ mol \ C_6H_{14}}}[/tex]
Multiply by 1.5 moles.
[tex]1.5 \ mol \ C_6H_{14} \times \frac {86.178 \ g \ C_6H_{14}}{1 \ mol \ C_6H_{14}}}[/tex]
The moles of C₆H₁₄ will cancel each other out.
[tex]1.5 \times \frac {86.178 \ g \ C_6H_{14}}{1}}[/tex]
[tex]1.5 \times {86.178 \ g \ C_6H_{14}}[/tex]
[tex]129.267 \ g \ C_6H_{14}[/tex]
1.5 moles of C₆H₁₄ is equal to 129.267 grams of C₆H₁₄
During a dilution, what happens to the concentration of a solution?
1
a.)The concentration increases
b.)The concentration decreases
c.) The concentration stays the same
d.)The concentration depends on the nature of the solute.
Answer:
B
Explanation:
Generally, when you dilute something, your goal is to thin your concentration. Even if you added a solute, if your goal is dilution, it will make the concentration decrease.
Why must an electron absorb a quantum of energy to move to a higher energy level?
Answer:
For an electron they start at the first level (n=1) In order to move up to the next level (n=2) the amount of quantom energy to move to this next level the energy must be perfect in order to move. If the quantom energy is to small the electron it doesn't try.
If the shape of the moon appears to be increasing over time, what is
this called? *
A.waning
B.waxing
C.crescent
D.gibbous
Answer:
B
Explanation:
What does an electromagnetic spectrum refer to?
O A. The energy of a photon emitted when an electron changes energy
levels
B. An angled piece of glass that splits up light into different
wavelengths
O C. A range of wavelengths of light that increases from one end to the
other
O D. The relationship between energy, wavelength, and frequency of
light
SUBMIS
Answer:
Explanation:
Option C is the correct answer
Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. Therefore, the correct option is option C.
What is electromagnetic wave?Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave.
There is a relation between energy of wave. frequency of wave, and wavelength of wave
Mathematically,
E=hc/λ
where,
E = energy of electromagnetic wave
h is planks constant having value 6.67×10⁻³⁴js
c is speed of light that is 3×10⁸m/s
λ is the wavelength of electromagnetic wave
An electromagnetic spectrum refer to a range of wavelengths of light that increases from one end to the other.
Therefore, the correct option is option C.
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Compare and contrast the characteristics of acids and bases. Give three
similarities and three differences. use COMPLETE SENTENCES for full points.
*
Answer:
Acid is a kind of chemical compound that when dissolved in water gives a solution with H+ ion activity more than purified water. A base is an aqueous substance that donates electrons, accept protons or release hydroxide (OH-) ions. An acid is a proton donor. While a base is a proton acceptor.
Explanation:
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