Answer:
I believe it will still be 4.00
Explanation:
0.714g of Helium is contained in the balloon
What is STP?STP stands for standard temperature and pressure. STP refers to a specific pressure and temperature used to report on the properties of matter.
According to IUPAC( International Union of Pure and Applied Chemistry), it is defined as -
Temperature of 0 degree celsius (273K)Pressure of 1 atmIt is generally needed to test and compare physical and chemical processes where temperature and pressure plays an important role as they keep on varying from one place to another.
One mole of a gas under STP conditions occupies a volume of 22.4L.
Given,
Volume = 4L
1 mole of a gas occupies 22.4L of volume at STP.
Thus, 1L of a gas occupies = 1 / 22.4 moles
so, 4 L will occupy = 4 / 22.4 moles
= 0.178 moles
Moles = mass / atomic mass
Mass = moles × atomic mass of He
= 0.178 × 4
= 0.714g
Therefore, 0.714g of Helium is contained in the balloon.
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Which of the following best describes the location of an element in the same period as the element tin?
A. Group 14(4A), Period 4
B. Group 16(6A), Period 5
C. Group 14(4A), Period 5
D. Group 13(3A), Period 6
Answer:
b
sorry if wrong
Explanation:
Some species of hares are brown most of the year, but change color to white in the winter. This allows them to blend in
through the seasons.
Where are these organisms adapted to live?
O deciduous forests
o desert
tropical rain forests
savanna
Answer:
Deciduous forests
Explanation:
Iron reacts with Oxygen gas to form Iron II Oxide according to the reaction
below.
4 Fe
+ 3 02
2 Fe2O3
How many moles of Iron II Oxide can be produced from 347.7 L of Oxygen gas at a temperature
of 74.3 °C and a pressure of 294.5 kPa?
Round Answers to 0.01 decimals
Answer:
2.0
Explanation:
How do cancer cells differ from normal cells? Select all that apply.
A
they do not stop at checkpoints
B
they condense their DNA into chromosomes for cell division
C
they go through the S phase
D
they have uncontrolled growth
Answer:
I'm pretty sure its D
Explanation:
they have uncontrolled growth
For the following reactions, predict the products, phases, and balance the chemical reactions,
6)
NaBr (aq) +
H3PO4 (aq) →
A volcano has no ____
only heat.
Answer:
A volcano has no friends only heat.
Explanation:
58. What is the temperature if 30.1 g of N, in a 1.00-L container is at a pressure of 25.2 atm?
DUE TONIGHT. LINKS DONT WORK SO PLS SHOW WORK. THANK YOU SO MUCH
Answer:
14°C
Explanation:
In order to use the ideal gas law, you need the number of moles of N2 present.
30.1 g x (mol / 28.02 g) = 1.07 mol N2
Use the ideal gas law: PV = nRT
Now isolate for T(temperature) and plug in your other values:
T = PV / nR
T = (25.2 atm)(1.00 L) / (1.07 mol)(0.08206)
T = 287 K
T(°C) = 287 K - 273 K = 14°C
Therefore, the temperature is 14°C
Using what you just observe, explain why clouds and precipitation contain freshwater even though much of the water vapor comes from oceans and seas
Answer:
Most of the water doesn't come from the ocean, it comes from fresh water sources
Explanation:
Hope you have a great day :)
Which alcohol will behave most like water? C 10H 21OH C 2H 5OH C 7H 15OH C 4H 9OH
Answer:
I believe it is C2H5OH
Explanation:
hopefully it's right
What effect does the addition of a catalyst have on a chemical reaction at equilibrium?
A.
It increases the rate of the forward reaction, only.
B.
It increases the rate of the reverse reaction, only.
C.
It increases the rate of both the forward and reverse reactions.
D.
It decreases the rate of both the forward and reverse reactions.
Answer:
C
Explanation:
In the presence of a catalyst, both the forward and reverse reaction rates will speed up equally. :)
Well did u ever wonder what's invisible but you wish people could see
Answer:
Yes yes i have.
Explanation:
Dont quite understand the way you worded the sentence but ok-
did u ever think that rocks could be squishy and when something touches them they become hard?
or that if we cant see wind...can fish not see water?
please help me with the definition of
activation energy
effective collisions
ineffective collisions.
please
Answer:
activation energy
the minimum quantity of energy which the reacting species must possess in order to undergo a specified reaction.
effective collisions
An effective collision is defined as one in which molecules collide with sufficient energy and proper orientation, so that a reaction occurs.
ineffective collisions
An ineffective collision (A) is one that does not result in product formation. An effective collision (B) is one in which chemical bonds are broken and a product is formed.
Complete the statements by writing the number
from the graph.
Temperature vs. Time
The substance is in the gas phase only in region
The substance is in both the liquid and the solid
phase in region
Temperature (°C)
3
400
360
320
280
240
200
160
120
80
40
0
-40
The substance is in only the liquid phase in region
The melting point is the temperature at region
2
The boiling point is the temperature at region
-80
DONE
Time (min) →
Intro
Answer:
A) The substance is in the gas phase only in "region 5".
B) The substance is in both the liquid and solid phase in "region 2"
C) The substance is only in the liquid phase in "region 3".
D) The melting point is the temperature at "region 2".
E) The boiling point is the temperature at "region 4".
Explanation:
The graph is a graph of the solid, liquid, vapour phase change diagram.
In phase 1, the substance is ice which is the solid phase.
In phase 2,it undergoes melting in a forward reaction.
In phase 3, the melting from phase 2 has now changed to water which is liquid phase.
In phase 4, the substance is undergoing a forward reaction known as evaporation.
In phase 5, the evaporation from stage 4 will turn the liquid into vapour known as the gas phase.
A) The substance is in the gas phase only in "region 5".
B) The substance is in both the liquid and solid phase in "region 2"
C) The substance is only in the liquid phase in "region 3".
D) The melting point is the temperature at "region 2".
E) The boiling point is the temperature at "region 4".
The change of state of a substance occurs when heat is either added or removed from the substance.
What is change of state?Change of state is a process in which a substance changes from one state of matter to another due to heat changes.
From the graph given:
The substance is in only the liquid phase in region 3.The subsybece is both in the liquid and solid phase at region 2.The melting point is the temperature at region 2The boiling point is the temperature at region 4The substance is in the gas phase only at region 5.Learn more about change of state at: https://brainly.com/question/9007095
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10. A solution contains 130 grams of KNO3 dissolved in 100 grams of water When 3 more grams of KNO3 is added, none of it dissolves, nor do any additional crystals appear. The temperature of the solution is closest to
A.65 Celsius
B. 68 Celsius
C. 70 Celsius
D. 72 Celsius
Answer:
Option B
Explanation:
We will check the solubility graph for potassium nitrate, KNO 3. Based on the graph it can be said that the temperature of solution when 130 grams of KNO3 dissolves in 100 grams of water is near to 65 degree Celsius. Now if three grams of solute is increased then the temperature of the solution will increase by a degree or so and hence the most probable temperature would be 68 degree Celsius.
Hence, option B is correct
Answer:
B. 68 Celsius
Explanation:
Order the terms according to the path followed by oxygen during cellular respiration.
Answer:
Outside air
Nose
Lungs
Bloodstream
Cell
Explanation:
We breathe in oxygen from the outside air in through our nose and it travels to our lungs. Inside our lungs, we have Avioli's that diffuse oxygen into our bloodstream and the bloodstream helps the oxygen travel into our cells.
Hope this helps :)
Respiration is the process of exchange of gases between the cell and atmosphere. The path of respiration involves Outside Air⇒ Nose⇒ Lungs⇒ Bloodstream⇒ Cell.
What is respiration?Respiration is the movement of oxygen from the outside environment to the cells and the removal of carbon dioxide from the cells into the outside environment.
Respiration is of two types depending upon the presence of oxygen:
1. Aerobic Respiration: This takes place in the presence of oxygen
2. Anaerobic Respiration: This takes place in the absence of oxygen.
The path of respiration includes inspiration of outside air into the nose, through the nostrils this air is passed on to the lungs. The alveoli is the site of gaseous exchange in the lungs. In the lungs, oxygen is inspired and carbon dioxide is expired.
The oxygen gas which is inspired by the lungs is dissolved in the blood. Oxygen forms a complex with the hemoglobin protein present in the blood. This blood is then circulated to all the cells and tissues of body. Thus, the oxygen is supplied to all the cells and tissues. The path includes Outside Air⇒ Nose⇒ Lungs⇒ Bloodstream⇒ Cell.
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how does the water cycle sustains life
plz help! !!
Water is constantly being cycled between the atmosphere, the ocean and the land. This cycling is a very important process that helps sustain life on Earth. When the sun heats water, the water evaporates or changes to water vapor. Water vapor rises and condenses or changes back into liquid water droplets.
A balloon is placed in a vacuum chamber (a container that all of the air can be pumped out of) and as the air is removed, the balloon increases in size/volume. This is an example of which gas law?
Charles' Law
Boyle's Law
Gay-Lussacs Law
Grant's Law
Answer:
Boyle's Law
Explanation:
"Boyle's law, also referred to as the Boyle–Mariotte law, or Mariotte's law, is an experimental gas law that describes how the pressure of a gas tends to increase as the volume of the container decreases."
-Wikipedia
HELPP asap I’ll mark you as brainlister
Answer: the answer is D the last one.
Explanation:
hope this helps! have a good day! :) ^-^
HELLLPPPPPP PLSSSSSSS!!!!
what do you think this plant has spikes for, survival, reproduction or defense?
Answer:
survival and defense......... plz mark me brainliest
A sample of gas occupies 806 ml at 26.0ºC and 998 mmHg. Find the volume of the gas at STP.
Answer:
966.4mL
Explanation:
Using the combined gas equation as follows:
P1V1/T1 = P2V2/T2
Where;
P1 = initial pressure
P2 = final pressure
V1 = initial volume
V2 = final volume
T1 = initial temperature (K)
T2 = final temperature (K)
According to this question, the following information were provided:
P1 = 998mmHg
P2 (STP) = 760mmHg
V1 = 806mL
V2 = ?
T1 = 26°C = 26 + 273 = 299K
T2 (STP) = 273K
P1V1/T1 = P2V2/T2
998 × 806/299 = 760 × V2/273
804388/299 = 760V2/273
2690.26 = 760V2/273
760V2 = 2690.26 × 273
760V2 = 734440.98
V2 = 734440.98 ÷ 760
V2 = 966.4mL
Write the unbalanced chemical equation for the following reaction:
nitrogen + hydrogen produces
ammonia (NH3)
pls help will give 20 points and brainliest!!! im desperate!!
The line starts at the bottom because it's the starting point. (You have to start somewhere, If that makes sense.)
I also noticed that the line is going up, which means she's going farther (in distance and time)
The line is straight which means she's going constant speed.When you remove energy from a substance there will be a *
A. Increase in movement of the molecules
B. Decrease in movement of the molecules
Answer:
b, decrease in movement of the molecules
Explanation:
removing the energy will begin making the molecules lock up and stop moving due to the loss of energy.
hope this helped
A gas occupies 800ml at a temperature of 27C. What is the volume at 132C?
Using dimensional analysis, convert 523.7 cm into feet. (1 in= 2.54 cm; 12 in=1 ft)
-15962
-2471
-17.18
-43.64
Answer:
17.18
Explanation:
(1 in = 2.54 cm; 12 in = 1 ft)
Formula:- Divide the length value by 30.48
523.7 ÷ 30.48 = 17.181
Thus, The answer is 17.181
-TheUnknownScientist
Answer:
17.18
Explanation:
I hope its helpful......
PLSS HELPP Giving brainliest!! Suppose you place the coefficient 4 before H2O. How many atoms of hydrogen and how many atoms of oxygen will the formula have?
Answer: 8 oxygen atoms and 4 hydrogen atoms. Explanation down below.
Explanation: One molecule of oxygen gas is composed of two oxygen atoms (O2). Here there is four atoms of oxygen gas which in total gives eight oxygen atoms. Same ways One molecule of hydrogen gas is composed of two hydrogen atoms (H2), so 2 atoms of hydrogen gas in total gives four hydrogen atoms. As per the formula of water, 2 (H2) and 1(O) to form a water molecule (H2O). Here there are 4 H2, so divide the number of hydrogen atoms by the number needed per water molecule i.e. 4 / 2 = 2. This means 2 water molecules will be produced.
Write your question here (Keep it simple and clear to get the best answer) Explain why ammonia gas is not collected over water
Answer:
Because of the solubility of ammonia gas in water, it is not collected over water.
Explanation:
Gases prepared in the laboratory are often collected by a technique called water displacement. A bottle is filled with water and placed upside-down in a trough or container of water. The reaction flask is connected to the bottle of water by means of a rubber or glass tubing which is fed under the water bottle . As the gas is produced in the reaction flask, it enters the bottle and displaces the water in it. When the bottle is full of the gas, it is then sealed. The volume of gas in the bottle can be used to determine the amount of gas produced in the reaction. Usually, the gas collected is present in addition to water vapor in the bottle.
Gases that are collected over water must not react with or dissolve in water.
Ammonia gas is very soluble in water. The solubility is due to the readiness with which it forms hydrogen bonds with water to produce aqueous ammonia, NH₃.H₂O.
Aqueous ammonia ionizes partially to produce ammonium ions, NH₄+ and hydroxide ions, OH-. Because of the solubility of ammonia gas in water, it is not collected over water.
What does temperature measure?
A. Degrees within molecules
B. Pressure within molecules
C. Kinetic energy within molecules
D. Potential energy within molecules
SUBME
Answer:
C is the answer!
Explanation:
temperature is a measurement of the average kinetic energy of the particles in an object
Why might an organism have more than one arrow coming from them in the food web