a bottle with a volume of 694 L contains how many moles of O2 gas at STP
Answer:
Solution given:
22.4 liter of O2=1 mole of O2
694litre of O2=[tex] \frac{1}{22.4} \times 694[/tex]
=30.98or 31 mole of O2
An ionic compound is what ?
Answer:
In chemistry, an ionic compound is a chemical compound composed of ions held together by electrostatic forces termed ionic bonding
Answer:
An Ionic compounds are compounds consisting of ions also held together by the attractive forces among the oppositely charged ions.
Explanation:
For example :
NaHCO3, sodium bicarbonate (baking soda; used in cooking)
NaCl, sodium chloride (common/ordinary salt)
Large objects that form dense gravity wells in space A. Galaxies B. Star C. Nebulae D. Black holes.
Answer:
D. Black Holes
Explanation:
Black holes are large objects that form dense gravity wells in space. Their gravitational pull is so strong that even light cannot escape it.
Large objects that form dense gravity wells in space are stars and blackholes. The correct answer is option B and D.
Gravity: it is referred to as force of attraction experienced by a body having mass, towards the center of Earth.
Both stars and black holes are massive objects that exert a significant gravitational force due to their mass. They create what is known as a gravity well, which is a region of space where the gravitational pull is strong enough to affect the motion of nearby objects.
On the other hand, Galaxies and nebulae, are not individual objects with sufficient mass to form dense gravity wells. Galaxies consist of a collection of stars, gas, and dust, and while they have a collective gravitational influence, it is not concentrated in a single massive object like a star or black hole. Whereas, Nebulae are interstellar clouds of gas and dust, which do not possess the mass required to create significant gravity wells.
Therefore, the correct options from the given list that form dense gravity wells in space are B. Star and D. Black holes.
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find the average speed of a person who swims 105 m in 70 s
Answer:
v = 1.5 m/s
Explanation:
Given that,
Distance covered by a person, d = 105 m
Time taken, t = 70 s
We need to find the average speed of the person. We know that the average speed is given by :
[tex]v=\dfrac{d}{t}\\\\v=\dfrac{105\ m}{70\ s}\\\\v=1.5\ m/s[/tex]
So, the average speed of the person is equal to 1.5 m/s.
Faster-moving water can carry a greater load.
true or false
Answer:
That is false
Explanation:
Just because it moves faster doesn't mean that it can carry and bigger load.
Answer:
False
Explanation:
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thermal conductors what
Diamond has a hardness of 10 and chalk a harness of 1. Explain what this means.
Answer:
they have different forces holding the atoms together
Explanation:
diamond has a strong convalent bond holding the particles together while chalk has weak van der waals forces holding the particles together hence the diffrence in hardness
a raindrop has a mass of 0.050g. how many moles of water does a raindrop contain
Answer:
The raindrops of mass 0.050g has 0.0028 moles of water
A type of symbiosis where one organism benefits, while the other organism is neutral.
Mutualism
Parasitism
Commensalism
Predation
Answer:
Commensalism is a symbiotic relationship in which one species benefits while the other species is not affected. One species typically uses the other for a purpose other than food.
what is the similar about the formula for hydrochloric acid and that for sodium chloride
Explanation:
Sodium Chloride is neutral whereas hydrochloric acid is an acid. 2. Sodium Chloride is solid while hyrdochloric acid is a gas.
I need help with the stuff highlighted in the blue
Answer:
CO2 + H2O = C6H12O6 + O2
or
6CO2 + 6H2O = C6H12O6 + 6O2 if it need to be balanced
Answer:
Answer is 6CO2 + 6H20 + (energy) → C6H12O6 + 6O2
Explanation:
some one help me with this please
Answer:
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The function of the cell wall is to
A.make a organism rigid
B.provide internal support for an animal
C.control substances going in and out of organisms
D.make a plant cell rigid
Answer:
D.make a plant cell rigid
Explanation:
Cell wall is present only in a plant cell. Option A, B & C are functions of the cell membrane not the cell wall.
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D.make a plant cell rigid
thanks hope it helps.What term describes the temperature at which a substance can change state from a liquid to a gas?
A. Boiling point
B. Melting point
C. Freezing point
D. Specific heat
Option A. Boiling point.
Explanation:
When you heat the water, the water gets converts into gaseous form.
As you know that water is in liquid form. So, when you heat the water, the water molecules absorbs the heat and get dispersed from one another molecules. i.e., molecules go far from the other molecules as they absorbed heat.
The term describes the temperature at which a substance can change state from a liquid to a gas, is boiling point. Therefore, option A is correct.
What is boiling point ?The temperature at which a liquid's vapor pressure equals the pressure around it and the liquid transforms into a vapor is known as the boiling point of a substance. A liquid's boiling point varies depending on the atmospheric pressure in the area.
Boiling point and saturation temperature are synonyms. Sometimes the measurement's pressure serves as a definition for the boiling point. The International Union of Pure and Applied Chemistry was founded in 1982.
The boiling point of a sample can be calculated using a number of techniques, such as distillation, reflux, and a Thiele tube. The simplest approach makes use of a Thiele tube and has the benefit of requiring less than 0.5mL of substance.
Thus, option A is correct.
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Gas is confined in a metal tank in the figure. At 20.20°C, the gas exerts a pressure of 8.532 atm.
After heating the tank, the pressure of the gas increases to 10.406 atm. What is the temperature of
the heated gas?
Answer:
The temperature of the heated gas is 357.6 K (or 84.6 C)
Explanation:
Gay Lussac's law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the gas molecules move faster. Then the number of collisions with the walls increases, that is, the pressure increases. That is, the pressure of the gas is directly proportional to its temperature.
In short, when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases.
So, this law indicates that the quotient between pressure and temperature is constant:
[tex]\frac{P}{T} =k[/tex]
You want to study two different states, an initial state 1 and a final state 2. Then it is true:
[tex]\frac{P1}{T1} =\frac{P2}{T2}[/tex]
In this case:
P1= 8.532 atmT1= 20.20 C= 293.2 K (being 0 C= 273 K)P2= 10.406 atmT2= ?Replacing:
[tex]\frac{8.532 atm}{293.2 K} =\frac{10.406 atm}{T2}[/tex]
Solving:
[tex]T2*\frac{8.532 atm}{293.2 K} =10.406 atm[/tex]
[tex]T2=10.406 atm*\frac{293.2 K}{8.532 atm}[/tex]
T2= 357.6 K
The temperature of the heated gas is 357.6 K (or 84.6 C)
The new temperature of the heated gas when the pressure increase to 10.406 atm is 84.60 °C
Data obtained from the question Initial temperature (T₁) = 20.20°C = 20.20 + 273 = 293.20 KInitial pressure (P₁) = 8.532 atm Volume = constant New pressure (P₂) = 10.406 atmNew temperature (T₂) =? How to determine the new temperatureThe new temperature of the gas can be obtained by using the combined gas equation as illustrated below:
P₁V₁ / T₁ = P₂V₂ / T₂
Since the volume is constant, we have:
P₁ / T₁ = P₂ / T₂
8.532 / 293.20 = 10.406 / T₂
Cross multiply
8.532 × T₂ = 293.20 × 10.406
Divide both side by 8.532
T₂ = (293.20 × 10.406) / 8.532
T₂ = 357.6 K
Subtract 273 from 357.6 K to express in degree celsius
T₂ = 357.6 – 273
T₂ = 84.60 °C
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How long does it take for fruit flies to develop from embryos to adults?
The geometry of a ______________ makes it a very stable shape.
Answer:
triangles
Explanation:
Antimony sulfide+hydrogen chloride—>
Answer:
Sb2S3 + 6HCl ⇆ 2SbCl3 + 3H2S
Explanation:
what happens to the wavelength as frequency increases
Explanation:
The higher the wavelength, the lower its frequency and energy
Answer:
As frequency increases wavelength decreases in size
Explanation:
The wavelength of the wave is inversely proportional to the frequency of the wave as the speed of the wave remains constant.
v = fλ ( v - speed, f - frequency, -wavelength)
[tex]\frac{v}{\lambda}[/tex] = f
Therefore at constant speed:
f ∝ [tex]\frac{1}{\lambda}[/tex] (inversely proportional)
What is the relationship of tissues to cells?
Tissues make cells.
Cells make up tissues.
Tissues are use for cell growth.
Cells help tissue grow.
Choose the mixed number that is equivalent to $ 5.08.
5 8/100
5 80/100
80/100
8/100
Answer:
a. 5 8/100 is equivalent to $ 5.08.
Explanation:
i hope this helps :)
Which might cause someone to be exempt from soccer practice? *
a. an injury
b. a previous absence
Answer:
injury
Explanation:
because get hurt we can say injury
Which of the chemicals in the following chemical reaction is the acid?
HCO3- + H20 -->CO3^2- +H30+
A.) HCO3-
B.) co3²-
C.) H30+
D.) H20
A) HCO3- , carbonic acic
LOOK im girl and i like this girl and I KNOW " she is gay" NO IM PAN so ya but do i ask out this girl?
Answer:
Do it if you feel like its your chance! Good luck!
Explanation:
At what temperature does a gas at 1.00 atm and 20 degree Celsius have a pressure of 4.00 atm.
Please help thanks.
Answer:
P1 =4 atm
T1= 20°C
P2=1 atm
T2=?
According to Gay-Lussac's Law or Third Gas Law,
P1T2=P2T1
4×T2=1×20
T2= 20/4
T2= 5°C
Answer At 5°C temperature does a gas at 1.00 atm !
How is chemical equilibrium achieved?
Question 15 options:
When the concentrations of reactants and products are constantly changing.
When the concentrations of reactants and products are constant.
When the concentrations favor the reactants.
When the concentrations favor the products.
Answer:
Explanation:
Equilibrium is achieved in a chemical reaction when there is a steady state with no change in concentrations.
So the answer is "When the concentrations of reactants and products are constant."
In nuclear fission reactions, what causes the atom's nucleus to become
unstable
Answer:
the forces i think
Explanation:
The absorption of a free moving neutron by the atoms nucleus
(A P E X)
Write the balanced nuclear equation.
263
1.
Sg
254 Rf + A He
106
104
4
2.
211
At
83
He
2
3.
248
96
Cm + He
4
-
235
U
92
+
He
4.
2
Answer:
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electronics configuration
Answer:
Electronic configurations describe each electron as moving independently in an orbital, in an average field created by all other orbitals.
Explanation:
Consider the following balanced equation:
3 H2 + N2 --> 2 NH3
What volume of hydrogen gas will react in a perfect ratio
with 3 liters of nitrogen gas?
Answer:
[tex]from \: avogadros \: hypothesis \\ 1 \: mole \: of \: nitrogen \: reacts \: with \: 3 \: moles \: of \: hydrogen \\ 3 \: litres \: of \: nitrogen \: react \: with \: ( \frac{3 \times 3}{1} ) \\ 9 \: litres \: of \: hydrogen[/tex]