Answer:
Explanation:
The trick here is to realize that if you know the volume of a gas at STP, you can use the fact that
1
mole of any ideal gas occupies
22.7 L
under STP conditions to calculate how many moles of gas you have in your sample.
Under STP conditions:
1 mole of an ideal gas = 22.7 L
−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
In your case, you know that your sample of gas occupies
2.28 L
under STP conditions, which are currently defined as a pressure of
100 kPa
and a temperature of
0
∘
C
.
This means that your sample will contain
2.28
L
⋅
molar volume of a gas at STP
1 mole gas
22.7
L
=
0.10044 moles gas
Now, the molar mass of the gas is the mass of exactly
1
mole of the gas. In your case, you know that you get
3.78 g
for every
0.10044
moles, which means that you have
1
mole
⋅
3.78 g
0.10044
moles
=
37.6 g
Since this is the mass of
1
mole of gas, you can say that the molar mass of the gas is
molar mass = 37.6 g mol
−
1
−−−−−−−−−−−−−−−−−−−−−−−
What type of elements can react with metals to form salts
Answer:
The Alkali metals
Explanation:
The alkali metals react with the nonmetals in Group VIIA (F2, Cl2, Br2, I2, and At2) to form ionic compounds or salts. Example: Chlorine reacts with sodium metal to produce sodium chloride, table salt. Because they form salts with so many metals, the elements in Group VIIA are known as the halogens.
Alkali metals are the type of metal that can react with metals to form salts. They form ionic compounds or salts when reacting with non-metals.
What are alkali metals?Alkali metals are the six elements of group 1 of the periodic table. thee metals are lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).
The main characteristics of alkali metals are:
They are brittle, metallic bonding causes them to be soft metals.Both their melting and boiling points are low.They are metals that are quite reactive.Ionization energy is the force needed to eject an electron from the outermost shell.Alkali metals interact to generate ionic compounds or salts. As an illustration, sodium metal and chlorine react to form sodium chloride or table salt.
Thus, alkali metals form salt when reacting with metals.
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What is the chemical formula for sodium sulfate
Answer:
Na2So4
Explanation:
Na is group 1, so has a charge of 1+
Sulphate’s formula is SO4 2-,
because sulphate has double the charge of Na, you need two Na’s to make it equal.
Therefore it’s Na2SO4
help lols plsssksksksksskd
Answer:
I'd say "a" because not everything with plants and animals is perfectly organized together nothing ever is.
Can someone pls help me on this
Answer:The bottom 3
Explanation:
Beacuse all of these have to do with this subject hope this helps.
Molecules are
close and
barely move
They keep
one shape
write short note on earth sheltering
Answer:
hfxyktxykt
Explanation:
An earth shelter is a structure (usually a house) with earth (soil) against the walls, on the roof, or that is entirely buried underground.
An earth sheltered house in Switzerland (Peter Vetsch)
Earth acts as thermal mass, making it easier to maintain a steady indoor air temperature and therefore reduces energy costs for heating or cooling.
Earth sheltering became relatively popular after the mid 1970s, especially among environmentalists. However, the practice has been around for nearly as long as humans have been constructing their own shelters.
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Complete the sentensent.Use the present simple or the present continuous.
_____ (your son/ ever talk) to strangers?
Answer:
does your son ever talk to strangers?
Explanation:
It protects the sensitive tips of your fingers and toes
Answer:
What Do Nails Do? Nails protect the sensitive tips of fingers and toes. We don't need our nails to survive, but they do support the tips of our fingers and toes, protect them from injury, and help us pick up small objects.
Which describes an atom that has fewer neutrons than protons and more lecterns than protons?
Answer:
An atom that has fewer neutrons than protons and more electrons than protons is a negative ion. The negatively charged particles in an atom are the electrons. The charge an atom carries depends on the balance between the number of protons and electrons in an atom.
Explanation:
please see the picture above! thanks
Answer:
cohesion
Explanation: the sticking together of particles of the same substance
Given the following reaction, how many moles of iron(III)
oxide can be produced from 65.2 moles of iron?
4Fe + 302 → 2Fe2O3
A balloon is filled with 26L of helium in the morning when the temperature is
17°C. By noon the temperature has risen to 32°C. What is the new volume of
the balloon?
Answer:
V1T1=V2T2
Explanation:
V2=V1T1/T2
The final volume of the gas can be determines using the Charles's law of volume and temperature. The volume of helium when temperature increased to 32 °C increases to 48.9 L.
What is Charles's law ?Charles's law states that, at constant pressure, the volume and temperature of a gas are in direct proportionality. Thus, as the temperature increases, volume of the gas increases.
Hence, V/T = constant
Let V1 and T1 be the initial volume and temperature and V2 and T2 be the final quantities. Then, the relation can be stated as ;
V1/ T1 = V2/ T2
Given that initial quantities:
V1 = 26 L
T1 = 17 °C
Final temperature T2 =32 °C
Then, final volume V2 = V1 T2/T1
V2 = (26 L × 32°C)/ 17 °C = 48.9 L
Therefore, the volume of helium gas increases to 48.9 liters.
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How can a chemical reaction be sped up?
Select from the drop-down menu to correctly complete the statement.
Pack in more of the reactant to increase the
A) Catalyst
B) Concentration
C) Surface Area
D) Temperature
Answer: monki says d
Explanation: monki big brain oof
Answer:
d
Explanation:
Where are the electrons inside an atom?
A.The electrons are in the nucleus of an atom
B.They are arranged in energy levels
C.The electrons are spread equally throughout the atom
Answer: B.They are arranged in energy levels
Explanation: Electrons orbit around the nucleus of an atom, and are not spread around equally throughout an atom because there are a different amount of electrons that can fit in each energy level or electron shell (both are the same thing). For example the first energy level can hold up to 2 electrons, the second shell can hold up to 8 electrons, the third can hold up to 18, and so on represented by the equation 2(n^2)
The CO2 that builds up in the air of a submerged submarine can be removed by reacting it with sodium peroxide. 2 Na2O2 (s) + 2 CO2 (g) → 2 Na2CO3 (s) + O2 (g)
If a sailor exhales 150.0 mL of CO2 per minute at 20oC and 1.02 atm, how much sodium peroxide is needed per sailor in a 24 hr period?
Answer: The sodium peroxide needed per sailor in a 24 hr period is 674 grams.
Explanation:
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure of gas = 1.02 atm
V = Volume of gas = 150.0 ml = 0.15 L
n = number of moles of carbon dioxide = ?
R = gas constant =[tex]0.0821Latm/Kmol[/tex]
T =temperature =[tex]20^0C=(20+273)K=293K[/tex]
[tex]n=\frac{PV}{RT}[/tex]
[tex]n=\frac{1.02atm\times 0.15L}{0.0821 L atm/K mol\times 293K}=0.006moles[/tex]
[tex]2Na_2O_2(s)+2CO_2(g)\rightarrow 2Na_2CO_3(s)+O_2(g)[/tex]
According to stoichiometry:
2 moles of carbon dioxide require = 2 moles of sodium peroxide
Thus 0.006 moles carbon dioxide require= [tex]\frac{2}{2}\times 0.006=0.006[/tex] moles of sodium peroxide
Mass of sodium peroxide needed for 24 hour=[tex]moles\times {\text {Molar mass}}=0.006mol\times 78g/mol\times 24\times 60=674g[/tex]
Thus sodium peroxide needed per sailor in a 24 hr period is 674 grams.
The amount (in grams) of sodium peroxide needed per sailor in a 24 hr period is 673.92 g
Determination of the mole of CO₂Volume (V) = 150 mL = 150 / 1000 = 0.15 L Temperature (T) = 20 °C = 20 + 273 = 293 KPressure (P) = 1.02 atmGas constant (R) = 0.0821 atm.L/Kmol Mole of CO₂ (n) =?Using the ideal gas equation, we can obtain the mole of CO₂ as follow:
n = PV / RT
n = (1.02 × 0.15) / (0.0821 × 293)
n = 0.006 mole
How to determine the mole of Na₂O₂ required2Na₂O₂ + 2CO₂ → 2Na₂CO₃ + O₂
From the balanced equation above,
2 moles of CO₂ required 2 moles of Na₂O₂.
Therefore,
0.006 mole of CO₂ will also require 0.006 mole of Na₂O₂.
How to determine the mass of Na₂O₂ required Mole of Na₂O₂ = 0.006 mole Molar mass of Na₂O₂ = (23×2) + (16×2) = 78 g/mol Mass of Na₂O₂ =?Mass = mole × molar mass
Mass of Na₂O₂ = 0.006 × 78
Mass of Na₂O₂ = 0.468 g per minute
Mass of Na₂O₂ required for 24 h = 0.468 × 24 × 60 = 673.92 g
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why are cells small?
Answer:
you know what i really dont know but imagine if they were huge
Explanation:
11
Two students are investigating relative motion. One student is on a bike and the other is on
foot.
The students on foot runs alongside the student on the bike as they cycles at the same speed.
Is their relative motion the same? Explain your answer? (highlight the correct answer)* 193
(1 Point)
Explanation:
No because the person on the bike is going faster then the person on foot.
List and describe all five types of chemical reactions. thx.
Answer:
combination, decomposition, single-replacement, double-replacement, and combustion.
Explanation:
The standard unit for measuring mass is the
Answer:
kilogram (kg)
Explanation:
66 A student wants to design a controlled experiment to solve the following problem: When placed in a freezer, will hot water or cold water reach 0°C faster?
The student plans to place two containers with equal masses of water (one hot and one cold) in the same freezer in the classroom.
a List three conditions the student should keep constant for the hot-water and cold-water setups when planning this experiment. [3]
b For each condition you name, give a scientific reason why the condition needs to be the same for both the hot-water and cold-water setups
Answer:
Explanation:
is guiZ
Energy changes WITHIN an energy type is called what?
Answer:
What is energy transformation? One type of energy can change into another type of energy. Energy transformation means the changing of energy from one type to another, e.g. from kinetic energy to electrical energy, or from potential energy to kinetic energy.
Explanation:
Answer:
It may seem a bit weird, but, I'm only doing this so that you can make that other person brainliest.
Explanation:
Which of these does not cause seasonal change?
A.the tilt of the Earth’s axis
B.the Earth’s orbit around the sun
C.the Earth’s distance from the sun
D.which side of the Earth is tilted toward the sun
Answer:
C.the Earth’s distance from the sun
Explanation:
Distance Does Not Cause Seasons
It is a common misconception that seasons occur because of Earth's elliptical orbit around the Sun, with winter occurring when Earth is farthest away from the Sun, and summer when it is closest to it. However, our planet's distance from the Sun has little effect on the onset of seasons.
The distance of the earth from the sun does not cause seasonal change. Therefore, option (C) is correct.
What is the reason for the seasonal changes?The seasons are changing depending on the sunlight reaching the Earth as it orbits around the sun during the year. The season changes are caused by the Earth as it is tilted on its axis. The earth travels each year in a loop around the sun.
The hemisphere of the Earth has tilted towards or away from the Sun. Because of that, there are different types of seasons are formed which are experienced in a whole year.
Summer season occurs on the earth when the hemisphere is tilted towards the sun and winter occurs in the hemisphere tilted away from the sun.
Because sunrays travel directly to the surface of Earth, the hemisphere which is tilted toward the sun is warmer. So they are less scattered in the atmosphere.
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TIMED TEST PLEASE HURRY!!! The development of a new experimental method is most likely to change a theory if it makes it possible to
analyze samples when they are frozen.
perform the experiment in a different lab.
obtain and analyze results more quickly.
study a larger sample size than before.
Answer:
study a larger sample size than before.
Explanation:
Science is evolving day by day and every new experiment is contradict the old experiment, giving new theories.
The advancement in the technology modifying the new experimental methods and it can change a theory if study a larger sample size than before. It is so because new experiment verify and validates larger sample size and evidences can contradict the old theory. Large sample size means more experiments and more validations.
Hence, the correct answer is "study a larger sample size than before."
Answer: is the D
Explanation:
lime kilns are very large. why is this necessary?
______and __________ factors can affect an organism’s genetic traits
Answer:
i think its Environmental and mutagens
Explanation:
1. Which of these is NOT found in the nucleus of an atom?
neutrons
protons
electrons
the mass of the atom
Answer:
Electrons
Explanation:
Answer:
Electrons are not found in the nucleus for they are orbiting the atom.
How many grams are in 8 moles of AI?
Answer:
c. 216 g
Explanation:
There is actually 215.852304 but when you round it, you will get 216
Me and my best friend. Gotta love her.
Answer:
cool
Explanation:
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Use the Internet to list five examples of elements with their properties and five examples of compounds with their properties.
Answer:
here you go
Explanation:
5 elements and properties:
Boron- The chemical properties of boron are more similar to carbon and silicon than elements of its own group, although boron is more electron deficient. Boron has a high affinity for oxygen-forming borates, and reacts with water at temperatures above 100 °C to form boric acid and other boron compounds.
Carbon- As a member of group 14 on the periodic table, it is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. The most common isotope of carbon has 6 protons and 6 neutrons, and has an atomic mass of 12.0107 amu. Its ground state electron configuration is 1s22s22p2.
Nitrogen- Nitrogen gas (chemical symbol N) is generally inert, nonmetallic, colorless, odorless and tasteless. Its atomic number is 7, and it has an atomic weight of 14.0067. Nitrogen has a density of 1.251 grams/liter at 0 C and a specific gravity of 0.96737, making it slightly lighter than air.
Oxygen- is the air you breath
Nickel- Nickel is a hard silver white metal, which forms cubic crystals. It is malleable, ductile, and has superior strength and corrosion resistance. The metal is a fair conductor of heat and electricity and exhibits magnetic properties below 345°C
5 compounds and properties:
Water - Formula: H2O = Hydrogen2 + Oxygen. ...
Hydrogen Peroxide - Formula: H2O2 = Hydrogen2 + Oxygen2 ...
Salt - Formula: NaCl = Sodium + Chlorine. ...
Baking Soda - Formula: NaHCO3 = Sodium + Hydrogen + Carbon + Oxygen3
Octane - Formula: C8H18 = Carbon8 + Hydrogen18
hope this helps
How does thermal energy flow between a hot or cold pack and the atmosphere?
Answer:
Heat is the transfer of energy. During energy transfer, the energy moves from the hotter object to the colder object. This means that the hotter object will cool down and the colder object will warm up. The energy transfer will continue until both objects are at the same temperature.
Explanation: