how many atoms in 10.0 g of Ar?
Answer:
1.51 x 10^23 atoms of Ar
Explanation:
Start out with what you're given.
10.0 g of Ar/1 * 1 mol/39.948 g Ar * 6.022*10^23 atoms/1 mol
(It's easier if you write it out.)
You always want to start out w/ what you're given and continue your unit conversions from there. Since you started out with grams of Argon, you want grams of Argon on the bottom to cancel it out. Once you found the unit conversion: 1 mol/39.948 g Ar (molar mass of Ar), now it's time to convert to atoms. Since 1 mol is up on top, put 1 mol on the bottom. Considering you're looking for atoms, use Avagradro's number: 6.022*10^23.
Once simplified, you should get 1.51 x 10^23 atoms of Ar.
***I hope this helps! I also suggest using a mole map, if you're interested.***
what gives off greenhouse gases
Answer:
the combustion of fossil fuels, such as coal, oil, and natural gas, to produce electricity.
Shontal compared some of the properties of a marble to a piece
of wood. She placed a marble and a piece of wood in a bucket filled
with water. Shontal observed the wood floating on top of the water,
but the marble sank to the bottom of the bucket. Which statement
best explains why the marble and piece of wood acted differently in
the water?
Answer:
The piece of wood was less dense than the water.
Explanation:
When an object has a lower density than water, it will float on the water.
Solutions of potassium chloride and silver nitrate are mixed.
Answer:
A solution of potassium chloride when mixed with silver nitrate solution forms an insoluble white substance silver chloride.
Explanation:
:)
Which of the following examples best describes an effect of urbanization?
A More land is available in large cities to grow crops.
B Wildlife diversity increases due to more open spaces within the city.
C Emissions from motor vehicles increase smog in the air that can block radiation.
D The greater concentration of people in large cities reduces overall waste production and accumulation on Earth.
please help
Emissions from motor vehicles increase smog in the air which can block radiation. Hence, option C is correct.
What does it mean to live in an urban area?An urban area is a region surrounding a city. Most inhabitants of urban areas have nonagricultural jobs. Urban areas are very developed, meaning there is a density of human structures such as houses, commercial buildings, roads, bridges, and railways. "Urban area" can refer to towns, cities, and suburbs.
Emission from motor vehicles increases smog in the air that can block radiation, which makes sense because urbanization means more people in one area=lots of pollution.
Hence, option C is correct.
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Which objects have the most eccentric orbits?
What is the unit of measurement for potential electric energy existing between two points on a circuit?
A. Joule
B. Voltage
C. Current
Suppose astronomers are interested in obtaining an image of a large
area in the sky. Which radiation should astronomers observe if they
want to get images 24 hours a day, quickly and cheaply? Why?
Find the volume of 2.40 moles of gas whose temperature is 50.0°C and whose pressure is 2.00 atm.
Describe a time in the group discussion when someone cited evidence from their research to make a point.
The role of the presenter in a group discussion to introduce information for the group to discuss.
What do you mean by group discussion?A discussion involving a number of people who are connected by some shared activity, interest, or quality.
Group discussion is a tool to test your teamwork skills, listening skills, discussion ability, subject knowledge, and communication.
Intrinsic skills like reasoning, speaking and time management come in very handy.
Skills that you can work upon include presentation, summarizing and people speaking.
The purpose of a group discussion is not to win an argument or to amuse your classmates.
The purpose of a discussion is to help each group member explore and discover personal meanings of a text through interaction with other people.
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Answer:
This happened when a nutritional question was presented. When asked a nutritional question, evidence was cited from one of the above sites to back up the answer.
Explanation:
Is the following a physical or chemical change?
Electrolysis of water makes hydrogen and oxygen.
P.s. what is electrolysis?
Answer:
chemical change
Explanation:
electrolysis process by which electric current is passed through a substance to effect a chemical change.
need help balancing these
Answer:
The answers are 1:3:13
Explanation:
when I had to do these types of equations just search them up on you-tube lol theres this guy called Wayne Breslyn that does a really good job of explaining and has like the answers for any and everyy balancing equation
Which of the following equations is balanced?
a) HgO -> Hg + 02
b) 2Mg + C12 --> MgCl2
c) P4 + 402 - 2P205
d) 2AgNO3 + CaCl2 --> 2AgCl + Ca(NO3)2
e) None of the above
Answer:
a
Explanation:
a because a
Which stateinent is accurate?
Explain what a convection current is and how it causes winds in the atmosphere.
6. The Haber process for making ammonia (NH)
gas from its elements was developed by Fritz Haber
during WWI. Haber hoped to use ammonia as
fertilizer to grow food for Germany during the
Allie's blockade. How many liters of hydrogen
would be required to produce 40.0L of ammonia at
STP? N+H, NH,
Answer:
60 Liters
Explanation:
The equation for this reaction is given as;
N2 + 3H2 → 2NH3
From the reaction;
3 mol of H2 produces 2 mol of NH3
At STP;
1 mol = 22.4 L
This means
67.2 L ( 3 * 22.4) of H2 produces 44.8 L ( 2 * 22.4) of NH3
How many L of H2 would produce 40 L of NH3
67.2 = 44.8
x = 40
Solving for x;
x = 40 * 67.2 / 44.8
x = 60 L
the correct formula for the diagram is
1. 2KO
2. K2O
3. K2O
4. KOK2
Answer:
The diagram provided shows K2O, or potassium oxide.
Explanation:
Ok... so, there are two "K2O" options, so I would just choose either and hope for the best. I don't know, maybe it's a mistake...
Answer:
The answer is K2O or dipotassium Monoxide
If today is Monday and it is a 1st Quarter moon, what phase will it
be on Thursday?
Answer:
Wanning gibouss 56%
Explanation:
Balance the equation by typing in the correct coefficients into the blank spaces in front of each formula. Type 1 if
the coefficient is 1, do not leave space blank
_EH + _ G2 → _EG + _HG2
Answer:
2 in front of every one
Explanation:
HOPE IT HELPS
Substances, such as litmus paper or red cabbage juice, that turn color based on the pH of the solution are called ___.
solutes
solutions
indicators
solvents
Answer:
soluteswws
Explanation:
Which is NOT a way nitrogen can be fixed or made more useful?
a
lightning
b
Nitrogen fixing bacteria
c
denitrification
d
assimilation
Answer:
A lightning
Explanation:
Can someone help me with this chem question?
Answer:
Malleable
Explanation:
Which of these compounds has the largest percentage by mass of nitrogen? NO N2O NO2 N2O3
The largest mass percentage of nitrogen in NO. Therefore, option (A) is correct.
What is the mass percentage?The percentage by mass of an element in a chemical compound can be described as the number of parts by mass of the element contained in 100 parts by mass of a chemical compound.
The mass percentage of an element can be determined in two steps:
First, calculate the molar mass of the compound and then the percentage of each element by dividing the total mass of the element present in the compound by the molecular mass of the compound multiplied by 100.
Given, the molecular formula of the compound is NO.
The molecular mass of the NO = 30 g/mol
The mass percentage of the Nitrogen = (14/30) × 100 = 46.67 %
the molecular formula of the compound is NO₂.
The molecular mass of the NO = 46 g/mol
The mass percentage of the Nitrogen = (14/46) × 100 = 30.4 %
the molecular formula of the compound is N₂O.
The molecular mass of the NO = 44 g/mol
The mass percentage of the Nitrogen = (14/44) × 100 = 31.81 %
the molecular formula of the compound is N₂O₃.
The molecular mass of the NO = 76 g/mol
The mass percentage of the Nitrogen = (28/76) × 100 = 36.84 %
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SOMEBODY PLEASE HELP ME
Scenario
On Halloween, children prepared to go trick-or-treating with glow sticks. They prepared two glow sticks (“Glow Stick In” and “Glow Stick Out”) following the directions below. The light intensity was given a value of 10 for both Glow Stick In and Glow Stick Out. At 6:00, the children left Glow Stick In inside of the 25oC house and took Glow Stick Out outside in 10oC weather. At 8:00, they noticed the light intensity of Glow Stick Out at 10oC had decreased to 5. They immediately returned home and noticed the light intensity of Glow Stick In at 25oC had decreased to 7. At 9:00, both glow sticks were at 25oC. Glow Stick In had a light intensity of 6, and Glow Stick Out had a light intensity of 8.
Using at least two scientific principles, write a scientific explanation that includes evidence that justifies or describes the change in light intensity of both glow sticks. Please use claim evidence reasoning.
Answer:
look out for a bot with a link he will get yo ip
Explanation:
Answer: It will become solid again and the form of it will change, because when you heat up something you add energy to it. The particles move further and further apart.
Explanation:
PLEASE HELP GUYS PLEASE!!!! I will LOVE WHOEVER HELP
ME FOREVER
Answer:
B. It is highly flammable.
Explanation:
Chemical properties deal with how the substance will behave when brought into contact with other substances, and usually have to do with it undergoing some kind of reaction. Flammability is a chemical property.
Density, melting point, and color are all considered physical properties.
Answer:
d
Explanation:
ignition is a chemical. reaction
Write a strong claim about the question:
What shape are cells?
( i don't really need a long answer)
Answer:
Usually, the cells are round, elongated or spherical. There are also some cells which are long and pointed on both the ends. Such cells exhibit spindle shape. In some cases, the cells are very long.
Explanation:
Hope I helped! Brainliest plz!
The unique shape of DNA allows what
Answer: to copy itself during cell division
Explanation:
Which of the following best explains how minerals get into streams?
A. Rainwater that is high in minerals from the atmosphere falls into the stream.
B. The stream absorbs minerals from the plants growing in and around its banks.
C. Rainwater dissolves minerals out of the rocks and soil along the stream during runoff.
D. When water evaporates from the ocean, it takes minerals with it and redeposits them as rainwater into the stream.
please help me
Answer:
C:Rainwater dissolves minerals out of the rocks and soil along the stream during runoff
Which of the following pairs of groups of elements cannot form ionic bond? *
IA & VIIA
IA & VA
VIIA & VIIIA
IIA & VIA
Answer:
pq ning kamot oi
Explanation:
hahahsfdydn ebejkakbabaha
please help! Will give Brainliest!
Answer: the answer is c
Explanation:
also, is that canvas? sajdasds