Answer:
mol is a measurement of large amounts so big
Any substance that is dissolve in water is considered
Chemistry homework about elements and compounds.
How many moles of a gas would occupy 22.4 Liters at 273 K and 1 atm?
Answer:
1 mole of a gas would occupy 22.4 Liters at 273 K and 1 atm
Explanation:
An ideal gas is a set of atoms or molecules that move freely without interactions. The pressure exerted by the gas is due to the collisions of the molecules with the walls of the container. The ideal gas behavior is at low pressures, that is, at the limit of zero density. At high pressures the molecules interact and intermolecular forces cause the gas to deviate from ideality.
An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:
P * V = n * R * T
In this case:
P= 1 atmV= 22.4 Ln= ?R= 0.082 [tex]\frac{atm*L}{mol*K}[/tex]T=273 KReemplacing:
1 atm* 22.4 L= n* 0.082 [tex]\frac{atm*L}{mol*K}[/tex] *273 K
Solving:
[tex]n=\frac{1 atm* 22.4 L}{0.082 \frac{atm*L}{mol*K} *273 K}[/tex]
n= 1 mol
Another way to get the same result is by taking the STP conditions into account.
The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C (or 273 K) are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
1 mole of a gas would occupy 22.4 Liters at 273 K and 1 atm
symbols used in equations, together with the explanations of the symbols, are shown below. which set is correct?
1. (g), grams
2. (l), liters
3. (aq), dissolved in water
4. (s), solid product
someone please explain this to me, all of these answers seem correct to me!
The set of explanations that has the correct representation for the chemical equation are aq and g. Thus the correct options are 3 and 4.
The chemical equation has been written with the symbols of the product and the reactant. The chemical equation has the moles of an element that has been reacted. The moles have written prior to the compound as the coefficient.
The compounds state has also been present in the chemical equation. The compounds in the reaction can be present as:
solidliquid dissolved in watergaseous stateThe symbol has been added to the compound to depict the state of the compound in the chemical reaction. The symbols used for the following states are:
s = solidl = liquid aq = dissolved in waterg = gaseous stateThe set of explanations that has the correct representation for the chemical equation are aq and g. Thus the correct options are 3 and 4.
For more information about the chemical equations, refer to the link:
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If Pulley A is 34% efficient and Pulley B is 85% efficient, what can we conclude? Which pulley would you rather use to lift a cement block?
Explain! This is science!!!
Answer:
I will use pulley b
Explanation:
because the pulley with more efficency can carry out the work better
Carol views a specimen under the microscope and notices that it has no nucleus. What
must she be looking at?
A. Animal cell
B. Plant cell
C. Bacteria
D. Protist
Answer:
Bacteria
Explanation:
Help! 7th Grade Math!
A triple beam balance measures the ______ of an object in ______.
A
mass, grams
B
volume, liters
C
temperature, Fahrenheit
D
length, meters
Answer:
D
Explanation: Trust me
The triple beam balance measures the mass of an object in grams.
Explanation:
A triple beam balance is an instrument used in labs to measure the mass of a substance or an object.It measures the mass in units of grams.It consists of three beams with a different set of increments in grams. which are:Middle beam = Increments of 100 grams
Front beam = Increments from 0 grams to 10 grams
Farther beam = Increments of 10 grams
So, from this, we can conclude that the triple beam balance measures the mass of an object in grams. Hence the correct answer is option A.
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How do ionic bonds differ from covalent bonds? I NEED HELP QUICK PLSSS!!!!!
Answer:
.
Explanation:
Answer:
Ionic bonds are usually between a metal and a nonmetal and involve the transfer of electrons. Covalent bonds are typically between two nonmetals and involve the sharing of electrons.
Explanation:
When elements bond together ionically, they transfer their valence electrons to another element to satisfy the octet rule and create full shells of 8 electrons. Metals usually have low electronegativity and ionization energy and can more easily give up an electron to a nonmetal with higher electronegativity and ionization energy.
When two nonmetals bond, their electronegativities are close enough in magnitude that neither element can "claim" the valence electrons, so the electrons orbit back and forth between the elements in the bond.
Temperature is a measure of ____ of the particles in an object.
Answer:
Temperature is a measure of "average kinetic energy" of the particles in an object
Suppose that the equilibrium tuition at College X is $2,000 a semester and the tuition that students are charged is $1,000 a semester. At $1,000 tuition a semester,
Answer:
a. quantity demanded of openings at the college is greater than quantity supplied.
Explanation:
Here is the full question :
Suppose that the equilibrium tuition at College X is $2,000 a semester and the tuition that students are charged is $1,000 a semester. At $1,000 tuition a semester,
a.quantity demanded of openings at the college is greater than quantity supplied.
b.quantity supplied of openings at the college is greater than quantity demanded.
c.quantity supplied of openings at the college equals quantity demanded.
d.quantity supplied of openings equals demand.
e.none of the above
Equilibrium price is the price at which quantity demanded equals quantity supplied.
When price is below equilibrium price, quantity demanded would exceed quantity supplied. As a result there would be scarcity. Prices would rise until equilibrium is reached
When price is above equilibrium price, quantity supplied would exceed quantity demanded, As a result, there would be surplus. Prices would fall until equilibrium is reached
Equilibrium tuition is $2,000 but the tuition charged is $1000. Thus, there would be excess demand over supply
PLZ HELP
In this activity, you’ll conduct research about the savanna biome, a type of grassland. Use credible websites to gather information on these points:
the location of the savanna on Earth
the conditions in the savanna (temperature, precipitation, etc.)
the living things that make up this ecosystem (Identify all forms: plants, prey animals, and predators, for example.)
the nonliving components that make up the environment
After you’ve completed your research, answer the following questions.
Part A
Summarize your research, and describe the attributes of the savanna.
Answer:
Savannas are grasslands found in Africa, Australia, South America, and India. The climate is warm or hot. Savannas experience both dry and rainy seasons. Each year, savannas receive about 20 to 50 inches of rain in a span of six to eight months. The other months are dryer. There’s also a threat of wildfires because of the severe dryness during these months. Grasslands are true to their name because their vegetation is mostly grass. Savannas are home to a wide range of animals, including different species of beetles and insects, which many creatures consume. Squirrels, mice, elephants, gazelles, and antelopes are the plant-eating animals that live in the savanna. Hyenas, lions, and leopards are some of the meat-eating animals in these areas. Some of the nonliving components of the system include very porous soil that allows water to drain easily.
Explanation:
this is the edmentum answer :)
What is a total eclipse of the sun?
Answer:
This is called a solar eclipse
Explanation:
It's when the moon covers the sun
You could look up the 2016/2017 solar eclipse :)
Answer:
A solar eclipse happens when the moon gets in the way of the sun's light and casts its shadow on Earth. That means during the day, the moon moves over the sun i think it is cool
Explanation:hope it helps :)
Petrol used in cars is obtained by refining ?
Answer:
Crude oil is refined to make petrol (in America this is known as gasoline) or diesel. Most forms of transport use either petrol or diesel to power their engines - from lawnmowers, cars, buses and motorbikes to large ships and aeroplanes.
Please help with this chemistry question it’s due by midnight
Answer:
HF is the limiting reactant
Explanation:
The balanced equation for the reaction is given below:
SiO₂ + 4HF —> SiF₄ + 2H₂O
From the balanced equation above,
1 mole of SiO₂ reacted with 4 moles of HF.
Finally, we shall determine the limiting reactant. This can be obtained as illustrated below:
From the balanced equation above,
1 mole of SiO₂ reacted with 4 moles of HF.
Therefore, 7.5 moles of SiO₂ will react with = 7.5 × 4 = 30 moles of HF.
From the calculation made above, we can see clearly that it will take a higher amount (i.e 30 moles) of HF than what was given from the question (i.e 5 moles) to react completely with 7.5 moles of SiO₂.
Therefore, HF is the limiting reactant and SiO₂ is the excess reactant.
More potential  energy can be stored by moving against the magnetic force of a stronger magnet
The Second Law of Thermodynamics states that the overall entropy of the universe (or any other isolated
system) can never decrease. Identify the systems to which the Second Law of Thermodynamics would
apply
a reaction vessel that is completely sealed and insulated
an open beaker containing an aqueous solution
a sealed glass flask that is not insulated
the Earth
Answer:
apply
does not
does not
does not
Explanation:
The Second Law of Thermodynamics is applicable to only a reaction vessel that is completely sealed and insulated as the entropy remains constant during such chemical change.
What is a chemical change?
Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.
There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical changes:
1) inorganic changes
2)organic changes
3) biochemical changes
During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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What's the correct name for Pt3N5
Answer:Phosphate
Explanation:It is called phosphate because of this higher state (otherwise it would be called phosphite and be PO3+3 ).
Which industry would most likely be affected if coal recourses were depleted.
1.Power production
2.Transportation
3.construction
In a covalent bond:
A. None of these.
B. One atom accepts electrons from another.
C. The atoms attract each other but their electrons do not interact.
D. Both atoms share their electrons.
Answer:
D. Both atoms share their electrons.
Explanation:
which of the following is formed by intense heat and pressure over millions of years?
A:Igneous
B:Metamorphic
C:Sedimentary
D:Magma
Answer:
B:Metamorphic
Explanation:
Rocks formed under high heat and pressure is essentially the definition of metamorphic rock :)
Scientists notice that many fish are dying in a local lake. Which onsite water quality data would they most likely gather to determine the cause of the fish kill?
A. arsenic and cyanide levels
B.water level and surface area
C.biodiversity and water depth
D. dissolved oxygen and temperature
Answer:
D. (Dissolved oxygen and temperature)
Explanation:
Have a nice day and stay safe <3
why does iron have two kinds of valence number?
Answer:
The electronic configuration of iron is: Ar3d64s2. the two electrons in the 4s orbital are paired, and two of the electrons in the 3d orbitals are paired leaving four unpaired electrons. In general when you are populating the p, d, f, etc
Explanation:
hope dis help
What's the force of a pitching machine on a baseball baseballs pitched by a machine
Answer:
CAN U HELP ME
Explanation:
PLS
what are two effects water pollution has on the environment?
Answer:
EFFECTS OF WATER POLLUTION
In addition, here are some of the other consequences: Destruction of biodiversity. Water pollution depletes aquatic ecosystems and triggers unbridled proliferation of phytoplankton in lakes — eutrophication —. Contamination of the food chain
is gold an example of a metal or nonmetal
Answer:
Gold is a metal lol
Explanation:
Chemically, gold is a transition metal and a group 11 element
the number of moles of
480 dm3 of He
Answer:
286
Explanation:
see ur periodic table
Help me please. I need to find the name of the oxides of the elements (N2O, SO3, Li2O, CO2, Al2O3, Cl2O, SO2, CrO3, MgO, CI2O5, K2O, BaO)
Answer:
Nitrous oxide,Sulfur trioxide, Lithium oxide, Lithium oxide,Aluminium oxide, Dichlorine monoxide, Sulfur dioxide, Chromium trioxide, Magnesium oxide,Dichlorine Pentoxide, Potassium oxide, Barium oxide
Explanation:
In an experiment between 26.4 grams of Mg and O,, Mgo is produced. The percent
yield was 90%. Determine the actual yield of magnesium oxide.
Answer:
39.6 g
Explanation:
The equation of the reaction is;
2Mg(s) + O2(g) --------> 2MgO(s)
To obtain the limiting reactant;
Number of moles in 26.4 g of Mg = 26.4g/24 g/mol = 1.1 moles
If 2 moles of Mg yields 2 moles of MgO
1.1 moles of Mg yields 1.1 * 2/2 = 1.1 moles of MgO
Number of moles in 26.4 g of O2 = 26.4 g/32g/mol = 0.825 moles
If 1 mole of O2 yields 2 moles of MgO
0.825 moles of O2 yields 0.825 moles * 2/1 = 1.65 moles of MgO
Hence Mg is the limiting reactant.
Theoretical yield of MgO = 1.1 moles of MgO * 40 g/mol = 44 g
Percent yield = 90%
Percent yield = actual yield/theoretical yield * 100
Actual yield = Percent yield * theoretical yield/100
Actual yield = 90 * 44/100
Actual yield = 39.6 g
If 154.9 grams of KOH exactly neutralizes 262 mL of an aqueous HCl solution, what is the concentration of the HCl solution ?
Answer:
10.54 M
Explanation:
First you multiply 154.9 by 262 to get the mols and then you divide that number by 3850.45540796906 L and you get 10.54 M.
What does an organism's phenotype describe?
Answer:
The term "phenotype" refers to the observable physical properties of an organism; these include the organism's appearance, development, and behavior
An organism's phenotype describe appearance, development, behavior, maybe even levels of hormones or blood cells.