Answer:1) 9,5 грамм
2) 1,8 л вроде
Explanation:
1) H2+F2=2HF
n(H2)=1 моль. n(F2)=1моль
M(H2)=1г/моль. М(F2)= 19г/моль
0,5:1=х:19.
2) H2S+2NaOH=2H2O+Na2S
M(H2S)= 34г/моль. М(NaOH) =40г/моль
5,6:80=х:34. m(H2S)= 2,38г.
n(H2S)= 2,38:34≈0,08
V=Vm•n= 22,4 • 0,08=1,8
A ball rolls down a ramp. It goes through a
straight tunnel, and then curves to the left.
Based on this information, which statement is
true about the ball's motion?
A student needs to make 0.855 L of a sodium bromide solution for an experiment. The concentration of the required solution is 0.350 M. How many grams of sodium bromide will he need to use?
Answer:
Explanation:
Molarity = moles/liters of solution
moles = molarity x Liters of solution
= 0.350 m/L x 0.855 L
= 0.299 mol
mass = moles x molar mass
= 0.299 mol x 102.89 g/ms
= 30.78 grams
if the electron affinity for an element is a negative number, does it mean that the anion of the element is more stable than the neutral atom?
Answer: No
Explanation: It means that an electron in an atom or ion is lower in energy than a free electron.
No, the anion of the element is more stable than the neutral atom but an electron in an atom or ion is lower in energy than a free electron.
What is kinetic energy?Kinetic energy is defined as the energy of the object that occurs due to the motion of the object. The total work needed by the body to starts accelerating it by the help of given mass which is supplied from the rest position and its mentioned velocity.
The energy body gets due to the process of acceleration by this the body will able to main the kinetic energy of the body without changing the speed of the body. The energy which has been stored in the body or any object by the help of the particular position or the proper arrangement of the parts is known as potential energy.
There will be no effect of the outside environment on the potential energy that present inside the body. The kinetic energy decrease or increase with change into the velocity.
Therefore, No, the anion of the element is more stable than the neutral atom but an electron in an atom or ion is lower in energy than a free electron.
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how many chromium (II) ions would bond with 2 phosphate ions?
Answer:
ummmm I don't know of sorry
Help me please!!!!!!!
Answer:
1. 264.369
2. 1772.65
3. 3.25
4.488
5. 0.164525
Explanation: I just added 0's to the ones that didnt have as many decimals which made it easy.
How to calculate the frequency of a wave?
Answer:
count each wave crest
Explanation:
hope this helps
imagine a basketball filled with liquid water. Would the basketball still hold the same number of molecules ? Can you use 22.4L/mol as the molar volume for liquid water?
Answer:
the ball will have more molocules
Explanation:
the ball has a heaveir mass
No, the basketball hold more number of molecules due to presence of water in it.
When the basket ball is filled with water so the empty spaces present between gas molecules also filled and increase occurs in the concentration of molecules.
We can't use 22.4L/mol as the molar volume for liquid water because it is a molar volume of ideal gas at STP and we know that liquid water is not a gas, it is a liquid so we can conclude that more molecules are present in the basket ball due to addition of liquid water.
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Standard temperature and pressure (STP) mean
Answer:
Standard Temperature and Pressure (STP) is the temperature of 0° C (273 K) and pressure of 1 atm (101.325 kilopascals). (Oxford Science Dictionary)
One mole of any gas has a volume of 22.4 dm³ at this temperature and pressure.
solve this conversion of units
1. 42.89 L=_______ gal =
2. 32c=_______ K =
3. 75m=_______ in =
answer me
short answer
Explanation:
B. 1) Tritium is the isotope of Hydrogen (H).
2) Mass of an Electron is 9.10938356 × 10-³¹ Kg.
3) Molecular mass of Carbon dioxide (CO2)
=> Molecular mass of carbon = 12g
Molecular mass of oxygen= 16g
molecular mass of CO2 = [12 + (16 X 2)]g
= (12 + 32)g
= 44 g
4) Dalton has given its Atomic Theory in the year 1803.
5) Nucleus is discovered by
= Ernest Rutherford discovered the nucleus of the atom in 1911.
hope this helps you.
Question 1 of 10
What happens inside a closed car on a hot day?
A. The pressure inside the car increases.
B. The molecules of gas slow down.
C. The number of molecules increases.
D. The volume inside the car increases.
Answer:
Explanation:
What happens inside a closed car on a hot day?
A. The pressure inside the car increases.
B. The molecules of gas slow down.
C. The number of molecules increases.
D. The volume inside the car increases.
The sunlight in the closed car increases the temperature, which makes the air molecules move faster, hitting the interior walls and windows more rapidly and thus increasing the pressure.
The answer is A.
That is why you never leave car windows rolled up on a hot day with a young child or pet inside. They can get sick and possibly die from overheating.
At 1 atmosphere and 20 degrees Celsius, all samples of H20(l) must have the same
A)volume B) mass C) density D) weight
(Explain)
Answer:
nice
Explanation:
one
At 1 atmosphere and 20 degrees Celsius, all samples of H₂0(l) must have the same density.
What is ideal gas equation?Ideal gas equation of gases gives idea about the behavior of gases at different conditions and it will be represented as:
PV = nRT, where
P = pressure
V = volume
n = moles
R = universal gas constant
T = temperature
After rearranging the equation, we get
P/RT = n/V
Quantities which are present on the left side all are constant and the value on the right side describes the density of the water.
Hence they must have same density.
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WILL MARK AS BRAINLIEST IF CORRECT
Answer:
B because if it's adding more atoms but becoming more compact then it is getting smaller.
Explanation:
We know that organisms pass traits onto their offspring through reproduction. So how is it
possible that a new trait could ever appear in a population? Wouldn't a trait have to already
exist in the population?
Answer:
There are recessive traits and dominant traits
Explanation:
recessive traits are always hidden
dominant traits are the ones that are present in an organism
some recessive traits can be passed on to offsprings to become dominant
and some dominant traits can be passed on to become recessive traits
that's life
Answer:
because of genetic variation.
Explanation:
because of meiosis and a process called crossing over, there is genetic variation and diversity in the world, with humans and animals.
Is oxygen likely to gain or lose electrons when boding? EXPLAIN.
Answer:
yes covalent bonding is the scientific term for this. This is simply four elements in groups 15 16 and 17 to receive electrons than to lose them oxygen atoms, for example, acquired two electrons to create see you two ions. The electron configuration is similar to that of the noble gas Neon.
this ionic compound is named incorrectly.
1. find and describe the mistake
2. correctly name the compound
CaCl² - Calcium Chlorine
CuS - Copper Sulfide
Li³P - Trilithium Phosphide
CuBr - Copper(II) Bromide
NaOH - Sodium Hydrogen Oxide
1. Ionic compounds are named using the cation and the anions in the compounds respectively.
The name of the cation remains thesame as it's element while the anions name changes by adding another suffix to the elements name.
Sometimes, the number of positive charge of a cation is added in front of it's name before adding the anion's name.
2. Correct names of the compounds above
CaCl² - Calcium chloride
CuS - Copper Sulphate
Li³P - Lithium Phosphide
CuBr - Copper (1) Bromine
NaOH - Sodium Hydroxide
Read More:
When naming a compound, which of these is written first?
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physical properties of alkaline metals
Answer:
shiny.
silvery-white.
somewhat reactive metals at standard temperature and pressure.
readily lose their two outermost electrons to form cations with a 2+ charge.
low densities.
low melting points.
low boiling points.
Explanation:
Which two kingdoms are the only prokaryotes
Answer:
There are two kingdoms of prokaryotes. These are the bacteria (or eubacteria ) and the archaebacteria (or the Archaea ).
Explanation:
An empty beaker weighs 31.89 g.
When completely filled with water, the beaker and its contents have a total mass of 305.55 g. What volume does the beaker hold?
Use d = 1.00 g/mL as the density of water.
Explanation:
difference of masses - (305.55-3189)g = 273.66g
density of water = 1g/mL.
therefore, volume = m/density (ρ)
= 273.66/1 = 273.66mL.
so, the beaker can hold 273.66mL.
hope this helps you.
Metals have special bonds, between atoms. The valence electrons are mobile and are shared by all metal atoms present.
Metals exhibit ______ due to the mobility of valence electrons.
a)brittleness
b)high conductivity
c)low melting point
d)high solubility in water
Answer:
High conductivity
Explanation:
Metals exhibit high conductivity due to the mobility of valence electrons.
A star is mainly made of hydrogen gas, but most classes of stars include other elements such as helium, calcium, and other heavier elements and molecules.
Group of answer choices
True
False
All living organisms do cellular respiration and give off carbon dioxide. TRUE OR FALSE
Answer:
false
Explanation:
All living things use cellular respiration to turn organic molecules into energy. Cellular respiration is the chemical process of breaking down food molecules in order to create energy in the form of adenosine triphosphate (ATP). ... This is called aerobic respiration.
Cellular respiration takes place in all living organism despite the level of organism and produces carbon dioxide and water.
What is cellular respiration?Cellular respiration is the process of breaking food or glucose by the action of biological catalysts to form carbon dioxide and water. This process goes through several stages including some electron transport chains
There are both aerobic and anaerobic respiration. Aerobic respiration takes place in the presence of oxygen whereas anaerobic respiration needs no oxygen.
Every living organism consume food and digest and from the food the cell makes energy by cellular respiration. Hence, the fact that all living organism do cellular respiration is true.
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who discovered periodic changes in properties of elements
Answer:
The person is Dmitri Mendeleev
if our body is 60% made out of water why don't we evaporate?
Let's see it you guys can solve this!
Answer:
ok
Explanation:
Water has a high heat capacity, so it will be harder for the fire to evaporate it
Differentiate the particles in terms of location, charge, and relative
Explanation:
location:
charge: 89%
relative:t h e y r e f i n e , a n d so a n d t h e n
t h a n k s f o r t h e p o i n t s
Which option explains how some parts of a plant can be white?
Some parts of a plant can be white because they do not contain chlorophyll.
Chlorophyll is a term to refer to a characteristic compound of most plants that has the function of:
Bring the green color to vegetablesTake charge of the photosynthesis process.Some plants do not have as much chlorophyll in their systems. However, this does not affect their reproduction and growth because they have developed other feeding methods through their roots.
These plants that contain low amounts of chlorophyll have pale and white colorations because chlorophyll is what gives the plants their intense green color.
Note: This question is incomplete because options are missing. Nevertheless, I can answer it based on my prior knowledge.
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Describe a simple experiment that can be perfomed in tha laboratory to demonstrate the formation of iron3chloride from iron fillings
Answer:
laboratory use the organic substances dissolve in water methanol or ethanol then Sinha to rise iron chloride solution is added a transient permanent coloration usually purple green or blue indicate the presence of a funnel or an hall
Explanation:
Please give the answer
Answer:
A. The battery. D. The wind turbine. E. The solar panels
These give us electrical energy
There is a spelling error, I believe that is supposed to say stretched bow.
By stretching back a bow you are storing (Elastic) Potential Energy.
The transformation is (elastic) potential energy into kinetic energy (with some energy lost as sound and heat)
please help! will give brainliest!!! match each of the terms on the right with the letters on the right.
Answer:
Metal -c
Explanation:
Which low-energy state of condensed matter is characterized by structural rigidity and resistance to changes of shape or volume?
Solid is the low energy state of condensed matter is characterized by structural rigidity