Answer:
6.023×10^23
Explanation:
as 1 atom of carbon molecules is equal to the Avogadro's number.i.e. 6.023×10^23
help me out real quick
Answer:
Copper reacts in acid
It has a high boiling point
Explanation:
the period tells us the number of ______ an element has.
A. Valance electrons
B. energy levels
Answer:
B) Energy Levels
What is a water system? Explain.
Examples of water systems in USA.
Answer: Its a type of "network." A water supply network or water supply system is a system of engineered hydrologic and hydraulic components that provide water supply.
Explanation: Schools, factories, office buildings, and hospitals which have their own water systems. Transient Non-Community Water System (TNCWS): A public water system that provides water in a place such as a gas station or campground where people do not remain for long periods of time
2. Rust forming on a piece of iron is an example of which of the following:
A. A physical change because the process can be reversed
B.
A chemical change because oxygen atoms from the atmosphere bonded with the iron atoms
C.
A violation of the laws of physics because new mass has been created
Answer:
B.
Explanation:
Rust is a chemical change because you can not undo it. Rusting of iron is a chemical change because a new substance iron oxide is formed. The presence of oxygen and water or water vapour is essential for rusting.
Mg(OH)2+2 HCI = MgCI2+ H2O
Answer:
Mg(OH)2 + 2HCI ⇒ MgCI2 + 2H2O
Explanation:
In order to balance a chemical equation you need to make sure both sides of the equations are equal.
Mg(OH)2 + 2HCI = MgCI2 + H2O
Mg = 1
Oh = 2
HCI = 2
Products:
Mg = 1
CI = 2
H = 2
O = 1
2H20 = 1 × 2 = 2
2 × 2 = 4
2HCI
1 × 2 = 2
Mg(OH)2 + 2HCI ⇒ MgCI2 + 2H2O
Hope this helps.
What is the wavelength of light in nm with energy of 6.95 x 10^-27 J?
Answer: 27 Hope it helps u
why are glass, quartz and plastics not used as ir sample holders?
Answer:
not used as sample holders because --> are opaque and absorb ir radiation
Explanation:
glass/quartz would absorb the IR radiation and mask the absorbtion of your sample.
IR sample holders must be made out of transparent materials. The glass, quartz, and plastics are not used as IR sample holders.
What is meant by transparent materials?Glass may travel entirely through transparent materials without any light bouncing back. Comparatively, translucent materials permit some light to pass through while also reflecting some light off their surface. All light is reflected off the surface of opaque materials.
Glass, Quartz, and plastics are not used as IR sample holders because they are opaque to IR radiation and would absorb in the IR spectrum and mask the absorption of the sample.
IR sample holders must be made out of transparent materials.
Therefore, glass, quartz, and plastics are not used as IR sample holders.
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which is the fulcrum?
A.C
B.E
C.A
D.B
E.C
Answer:
C
Explanation:
Drinking water should have sufficiently low levels of __________ to prevent disease. What is the missing word in this sentence?
Drinking water should have sufficiently low levels of dissolved salts to prevent disease.
What are the benefits of dissolved salts?Water contains dissolved salts which provide taste to water for drinking purposes. Also these salts are essential for growth and development of plants. These dissolved salts provide the essential minerals which are required for growth of body.
A dissolved salt disappears within a solution, so you can't see what it looks like. For example, when table salt dissolves in water, the Na+ and Cl- ions that form it dissociate and the ions float freely in water. You can no longer see the individual salt grains.
The two largest dissolved components of typical seawater are chlorine (56% of total) and sodium (31% of total), with the total of all lumped under the designation of “salts.”
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Which item is made from a basic ingredient? (2 points) Soap Tea Wine Vinegar
Answer:wine
Explanation:it’s made from grapes
Which of these is an accurate description of convection
Answer:
The movement of materials based on differences in temperature and density, I believe
Explanation:
What is the answer for this question down below?
Answer:
This is a potassium because it's atomic number is fifteen
what is lattice energy and how is it involved in an ionic bond
Answer:
Lattice energy is an estimate of the bond strength in ionic compounds. It is defined as the heat of formation for ions of opposite charge in the gas phase to combine into an ionic solid.
Explanation:
Help! Will give brainlist!
Answer:
Organic compound: 1) found naturally in or produce by living things or 2) it contains carbon
Inorganic compound: does not come form living things
Explanation:
Organic molecules associated with living organisms are also called biomolecules. Organic compounds are molecules that contain carbon atoms covalently bonded to hydrogen atoms (C-H bonds).
it was believed that chemical synthesis could occur only in living organisms and organic compounds were defined as coming from living organisms, whereas inorganic compounds come from nonliving sources.
I hope this helps.
What takes the place of ounces in the metric system?
Answer:
Liters
Explanation:
Ounces determine weight, when you want to convert ounces to the metric system you have to convert it to liters. For example one ounce would equal 29.5735 milliliters means it is now in the metric system and will assist with finding the volume of a shape. Which means your answer is "liters."
Hope this helps.
Help Asap for Brainlist
Answer:
3rd option
Explanation:
A wave has a length of 380 nm. Find its frequency in Hz.
Answer:
The shortest wavelength of visible light is 380 nm. Its frequency is 7.89x1014Hz. That will be visible light’s highest frequency.
Explanation:
In Scratch, when making the jump command for a sprite to jump if the space bar is pressed, you place the command outside the hexagon.
A.
True
B.
False
game design help me plz 25pts and brainliest
Answer:
that would be true you place it outside the hexagon
Explanation:
Answer:
False
Explanation:
Did on Edge
Why does a hot air balloon float? use all the words: less dense, kinetic energy, heat, force, molecules, faster, pressure, temperature, fire, volume, increase, more, same mass, increased volume, inside the balloon
Answer:
A hot air balloon floats because, the air inside of the balloon is more dense than the air outside the balloon. The air inside the balloon is a hotter temperature and has more kinetic energy as more molecules move faster. And has to be heated enough to carry the amount of passengers and it all depends on mass. The pressure of the outside air is supporting the hot air balloon by force and the fire uses its heat to makes the balloon air increase in temperature therefore making the balloon float up because heat rises. The air inside the balloon expands and has increased volume.
How is a strand of DNA like a sentence?
Answer:
DNA molecules are composed of four nucleotides, and these nucleotides are linked together much like the words in a sentence. Together, all of the DNA "sentences" within a cell contain the instructions for building the proteins and other molecules that the cell needs to carry out its daily work.
Explanation:
A strand of DNA is much like an extremely long sentence that uses only four letters. DNA actually has two strands, much like a zipper and the nucleotides are like the teeth of that zipper. This two-strand system is the key to how DNA is able to make copies of itself.
A hydrocarbon contains 7.7% by mass of hydrogen and 92.3 by mass of carbon and the relative molecular mass is 78 derive the empirical formula of the compound and the molecular formula
Answer:
molecular mass = 78
Empirical Formula is
C= 92.3/12= 7.69
H= 7.68/1= 7.68
therefore Empirical formula is
CH
molecular formula is
(CH)n= 78
(12+1)n=78
n=78/13
n=6
molecular formula is
C6H6
Compared to carbon dioxide, oxygen has a relatively _____ solubility coefficient and so requires a _____ partial pressure gradient to help diffuse the gas into the blood.
Oxygen has a relatively low solubility coefficient and therefore requires a steep (high) partial pressure gradient to help diffuse the gas into the blood.
Solubility is described as the limiting amount of an element that can dissolve in any amount of solvent at a set temperature. Since oxygen has a low coefficient of this, it requires the help of a higher partial pressure gradient to diffuse properly into the bloodstream.
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An atom that has lost or gained an electron no longer has a neutral charge. We call this negatively or positively charged atom a(n) ________.
Answer:
ion
Explanation:
An atom that has lost or gained an electron no longer has a neutral charge. We call this negatively or positively charged atom a(n) ________.
ion
An atom that has lost or gained an electron no longer has a neutral charge. We call this negatively or positively charged atom a(n) " ion".
What are lost electrons?A positively charged atoms has lost electrons.
An Electron are easy to remove from the atom, electron has negative charge. Initially; atom is neutral that is the charge of electron is equal to the charge of the proton, when atom loose some of its electron, the net charge of electrons is less than the net charge of the Protons makes the atom positively charged.
An atom that has lost or gained an electron no longer has a neutral charge. We call this negatively or positively charged atom a(n) " ion".
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What is the name of these two molecules?
Answer:polyatomic molecules
Explanation:molecule, a group of two or more atoms that form the smallest identifiable unit into which a pure substance can be divided and still retain the composition and chemical properties of that substance.Characteristics of molecules
The division of a sample of a substance into progressively smaller parts produces no change in either its composition or its chemical properties until parts consisting of single molecules are reached. Further subdivision of the substance leads to still smaller parts that usually differ from the original substance in composition and always differ from it in chemical properties. In this latter stage of fragmentation the chemical bonds that hold the atoms together in the molecule are broken.
What is an element that is crucial building block of DNA?
What is the element that makes up approximately 50% of bones mass?
What is the radioactive heavy metal, often considered as the most dangerous element?
What property does noble gases share?
1. Adenine, cytosine, guanine, or thymine.
2. Calcium
3. They are many different radioactive heavy metals, but the most dangerous elements is arguably Polonium.
4. They are all odorless, colorless, monatomic gases with very low chemical reactivity.
WILL MARK AS BRAINLIEST IF CORRECT
[tex]\huge\bold{\purple{\bold{⚡a.⚡}}} [/tex]
[tex]\huge\bold{\red{\bold{⚡c.⚡}}} [/tex]
Both of the above are correct- because :
Products in a reaction are next to the direction arrow. So, CO2 is a product. Reactants are present on LHS(side opposite to the direction of arrow). So O2 is a reactant[tex]\huge\underline\mathtt\colorbox{cyan}{Hope it helps!}[/tex]
ILL GIVE YOU BRIANLIEST! PLEASE HELP: Every compound is a molecule, but every molecule is not a compound. Why is this? Give an example with your answer.
Answer:
A molecule can be made up of two atoms of the same kind:)
Explanation:
hope that helps:))
Answer:
Explanation:
A compound is a makeup of molecules.
Every organism is made up of an atom.Combined atoms can create a moleculeCombined molecules can create a compound.When you make a compound, you are combining molecules. But when you make a molecule, you are not combining compounds, you are combining atoms.
Examples:
Atoms:
[tex]\mathrm{H}[/tex] (hydrogen) and [tex]\mathrm{N}[/tex] (nitrogen)
Molecules:
[tex]\mathrm{H_2}[/tex] and [tex]\mathrm{N_2}[/tex]
Compounds:
[tex]\mathrm{H_2SO_2}[/tex] and [tex]\mathrm{NaCL}[/tex]
Take a look at the Compounds and Molecules section. The [tex]\mathrm{H_2}[/tex] in the example of a molecule is in one of the examples of the compounds, but the [tex]\mathrm{H_2SO_2}[/tex] (THE WHOLE THING) is not in the molecule. This shows how every compound is a molecule, but every molecule is not a compound.
After a product is released from its active site, a(n) ______ can be used again in another reaction because it is not consumed or altered in the reaction.
Answer:
Enzyme.
Explanation:
Enzymes act as a catalyst in all reaction but remain unchanged by the process.
What is a nuclear chain reaction, and how is it related to the concept of a critical mass?
the minimum amount of nuclear material needed to cause a chain reaction to continue without stopping
Answer:
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What's the boiling point of water at 0 atmospheric pressure?
Answer:
The water will evaporate and fly out of the bucket; the process will not stop until there is enough water vapor in the atmosphere that the vapor pressure stops the water from boiling further.
Explanation:
