Answer:
1:F,2:F,3:T,4:I don't really know
10L of a gas are stored at 20 °C and 12 atm pressure. How many moles of gas are there? ( convert temp to Kelvin )
Answer:
5.0mol
Explanation:
Use the ideal gas law, PV = nRT
P = 12atm, V = 10L, R = 0.0821 atm•L/mol•K, and T = 20°C
First, convert the temperature to kelvin by adding 273.15. That's 293.15.
Now, modify the equation to solve for mols. That's n = PV/RT.
Input your values:
n = (12atm)(10L)/( 0.0821 atm•L/mol•K)(293.15K)
n = 4.985953116mol
Round to 2 significant figures to get 5.0mol
(I don't know if you usually do rounding so you may want to keep the answer exact)
Please help! I need the answers! you’ll get 25 points!!
Answer:
183918551670's1665....
100points and BRAINEST awnser PLEASEEEE HELP
I need help with 2 and three
Answer:
2 H2O → 2 H2 + O. Decomposition of water.
There are 4 hydrogen atoms on the left side of the equation (CH4)
2 on the right side (H2O).
Two oxygen atoms
Explanation:
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:
uueuryfyfyfygd ehh bccvbbnmcj cr i
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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A sacrificial anode can be used to protect a metal like iron from corrosion. In order for this to work, the anode must be _____ than the metal that it is protecting.
Answer:
more active
Explanation:
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:
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.
Help Asap for Brainlist
Answer:
3rd option
Explanation:
the period tells us the number of ______ an element has.
A. Valance electrons
B. energy levels
Answer:
B) Energy Levels
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:
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.
WILL MARK AS BRAINLIEST IF CORRECT
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[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]
PLS HELP ASAP I WILL GIVE BRAINLIEST FOR THE ANSWER THAT IS RIGHT!Based on the diagram below, in what period is the atom located on the periodic table? *a. period 4b. period 2c. period 6d. period 1
Answer:
6
Explanation:
im guessing because there is no diagram
2. An atom has 24 protons and 28 neutrons.
What is the atomic number
Answer:
The atomic number is 24.
Explanation:
The atomic number is the total amount of protons that an atom has. How it differs between the atomic mass is that the atomic mass is the total sum of protons and neutron. If an atom is neutral (Non-ionized), then the amount of electrons is equal to the amount of protons.
This atom has:
An atomic number of 24Has 24 electronsAn atomic mass of 52This atom is Chromium-52A 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
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.
Porphyry copper deposits that are weathered are more valuable than nonweathered deposits because ______.
Porphyry copper deposits describes copper ore bodies which are formed from large copper ore bodies due to the high temperature exerted by magmatic fluid originating below the ore deposit.
Weathered portion of the Porphyry copper resulting from the reaction of hydrothermal fluid are washed to greater depth level below the unweathered portion of the deposit. Copper deposits at greater depth are usually more concentrated with copper than those above.Hence, reason why weathered porphyry are more valuable than unweathered porphyry.
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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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identify whether each change represents an oxidation or reduction. then determine how many electrons were involved and which side of the reaction they should appear on in the half-reaction.
In a redox reaction, we can identify 2 kinds of half-reactions:
Oxidation: the oxidation number increases.Reduction: the oxidation number decreases.Let's consider the following half-reactions.
Al ⇒ Al³⁺This is an oxidation because the oxidation number increases from 0 to 3+. To balance it, we need 3 electrons on the right side.
Cu²⁺ ⇒ CuThis is a reduction because the oxidation number decreases from 2+ to 0. To balance it, we need 2 electrons on the right side.
2 F⁻ ⇒ F₂This is an oxidation because the oxidation number increases from -1 to 0. To balance it, we need 2 electrons on the right side.
Al ⇒ Al³⁺ is an oxidation and 3 electrons on the right side are needed.Cu²⁺ ⇒ Cu is a reduction and 2 electrons on the left side are needed.2 F⁻ ⇒ F₂ is an oxidation and 2 electrons on the right side are needed.Learn more: https://brainly.com/question/2671074
Identify whether each change represents an oxidation or reduction. then determine how many electrons were involved and which side of the reaction they should appear on in the half-reaction.
Al ⇒ Al³⁺
Cu²⁺ ⇒ Cu
2 F⁻ ⇒ F₂
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:
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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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.
which is the fulcrum?
A.C
B.E
C.A
D.B
E.C
Answer:
C
Explanation:
Which of these is an accurate description of convection
Answer:
The movement of materials based on differences in temperature and density, I believe
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.
What is the answer for this question down below?
Answer:
This is a potassium because it's atomic number is fifteen
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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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.
