Answer:
Phân tử khối của MnO4 = 55 + 16 x 4 = 119 ( đvC )
Explanation:
The prefix 'sub' means 'below'. Why are particles smaller than an atom called subatomic particles.
Answer:
Because they are smaller than an atom
Explanation:
Write down the ratio of the atom present in the formula for each of the compound. a) Sodium Carbonate , Na2CO3 b) Glucose, C6H12O6
Answer:
what subject is this? science?
Pick 1 plz.....................
Answer:
your answer should be B ANDC
Answer:
B and c is your answer
Explanation:
. Is it possible to have an oxygen atom with 8 protons and another oxygen atom with 9 protons? Explain.
Answer:
no
Explanation:
changing the number of protons will change the atomic number, and if the atomic number is changed, it will become a different element. if you give oxygen 9 protons, it would no longer be oxygen, it would be fluoride.
how many moles of o2 are needed to react with 2.60 moles c2h2
To determine the moles of O₂ needed, we have to know in what ratio the two reactants react and then use the moles of C₂H₂ in reaction to determine the moles of O₂ needed. We can find this out based on their coefficient in a balanced equation:
Write a Balance Equation
2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O
Compare the Mole Ratio (Equation Coefficient of C₂H₂ to O₂)
Based on the equation, the mole ratio of C₂H₂ to O₂ is 2 to 5. Therefore for every molecule of C₂H₂, ⁵/₂ C₂H₂ molecules are needed to react.
Find the moles of O₂
Since the number of moles of C₂H₂ = 2.60 moles
then moles of O₂ = 2.60 moles × ⁵/₂
= 6.5 moles∴ 6.5 moles of O₂ is needed to completely react with 2.60 moles of C₂H₂.How many moles are in 13.5g of calcium?
Answer:
=0.337mol Ca this is the correct answer :)
What is the mass of 7.675 x 1023 atoms C? Answer in units of g.
Answer: 15.3 grams C
Explanation: 1 mole is 6.02x10^23 atoms. We can find the moles of C in 7.675 x 10^23 atoms of C by dividing:
(7.675 x 10^23 atoms C)/(6.02x10^23 atoms C/mole) = 1.275 moles C
The molar mass of carbon is 12g/mole. So the mass of 7.675 x 10^23 atoms is (1.275 moles C)*(12 g/mole C) = 15.3 grams.
A popular radio station broadcasts with a frequency of 92.7 MHz. What is the wavelength of the broadcast?
How many atoms are in 1.00 moles of lithium? __ atoms Li
PLEASE ANSWER:)
Answer: 6.022 × 10²³
Explanation:
Avogadro's Number (6.022 × 10²³ atoms/mole) is the number of atoms in any mole of a substance.
True or False. Weather describes the atmospheric events that occur each day & climate is the average weather pattern in an area over many years.
Answer:
true
Explanation:
Answer:
» TrueExplanation:
Weather refers to short-term changes in the atmosphere of each day ,
Climate describes what the weather is like over a long period of time in a specific area. Different regions can have different climates
Can we change the ratio between the elements?with explantion
Answer:
What happens when you change the ratio of elements in a compound?
If two elements combine in a different ratio, the result is a different compound. In other words, the same compound will always form from the same elements in the same ratio.
Explanation:
How do you find the ratio of an element?
Convert the mass of each element to moles of each element using the atomic masses. Find the ratio or the moles of each element by dividing the number of moles of each by the smallest number of moles. There are fewer moles of oxygen than any other element, so we will assume one mole of oxygen to establish the ratios.
.
.What is the ratio of the elements?
The atomic ratio is a measure of the ratio of atoms of one kind (i) to another kind (j). A closely related concept is the atomic percent (or at. %), which gives the percentage of one kind of atom relative to the total number of atoms. The molecular equivalents of these concepts are the molar fraction, or molar percent
25. In the formula for a molecular compound, which atom generally comes first? You may went
to refer to a periodic table.
Answer:
For organic compounds, carbon and hydrogen are listed as the first elements in the molecular formula, and they are followed by the remaining elements in alphabetical order. For example, for butane, the molecular formula is C 4 H 10.
Explanation:
How could understanding the unified structure of atoms help you better understand an element that was unfamiliar to you?
Answer:
Well,You have to understand pretty much everything, If you know the number of protons or electron then you will know its atomic number,and if you know the number of protons and neutrons then you will know the mass of the element. so, once you grasp these concepts, you can better understand new elements.Explanation:
Provide a particle-level explanation for the relationship between pressure and temperature
when the alcohol is in the gas phase.
The conservation of energy allows finding the relationship between pressure and temperature is:
Pressure is directly proportional to the temperature of the alcohol in the gaseous state.
Pressure is defined by the relationship between force and area of application.
P =[tex]\frac{F}{A}[/tex]
Where P is the pressure, F is the force and A is the area.
In the case of alcohol in the gaseous state, the mechanical energy of the molecules is only kinetic energy, it is related to temperature by the Boltzmann equation.
Em = K = [tex]\frac{3}{2}[/tex] kT
½ m v² = 3/2 k T
v² = [tex]\frac{3 k T}{m}[/tex]
Where m is the mass, v the velocity of the particles, k the Boltzmann constant and T the absolute temperature.
From this equation we see that as the temperature increases, the speed of the alcohol molecules also increases.
Using the relationship between the impulse and the change of momentum we can find the mean force.
I = F t = Δp
Where I impulse, F is the force, t is the time, Δp is the change of momentum.
if we assume elastic collisions the amount of initial and final moment are equal.
[tex]F = \frac{2p}{t} \\F = \frac{2m}{t} v[/tex]
If we assume that the molecules go at a constant speed.
v = d / t
t = d / v
Let's substitute.
[tex]F = \frac{2m}{d} v^2[/tex]
We substitute in the pressure equation.
P = 2m / Ad v²
[tex]P = \frac{6k}{ A d} \ T[/tex]
In conclusion using the conservation of energy we can find the relationship between pressure and temperature is:
Pressure is directly proportional to the temperature of the alcohol in the gaseous state.
Learn more here: brainly.com/question/20638378
What is the mass of 15.0 moles of gold?
Answer:This Should Be the Answer :)
Explanation:
iven: Molar mass of Au = 196.96 g/mol. The Number of moles = 15.3 moles. Hence, 15.3 moles of Au contains 3.01 103 g of Au.
PLEASE HELP! NO LINKS!!
WILL MARK BRAINLYIST :)
The Periodic Table of Elements contains many patterns that help explain the characteristics of elements. Choose one pattern you have learned and explain what it tells us about elements.
Answer:
let's look at the far left column of the periodic table. this pattern tells us that these elements are the noble gases. Noble gas is all conduct electricity and they are all odorless and colorless. The Roman numeral above this column means that there is one free electron (valence electron) in the outer shell, except for helium which has two. That's why it's a different color from the rest in the same column.
What do polar compounds and ionic compounds have in common?
Answer:
In what way is a polar-covalent bond similar to an ionic bond? There is a difference between the electronegativities of the two atoms in both types of bonds that results in electrons being more closely associated with the more electronegative atom.
Explanation:
Explain and define the angular momentum quantum number without the internet
Answer:
The angular momentum quantum number, l, describes the shape of the orbital that an electron occupies. The lowest possible value of l is 0, and its highest possible value, depending on the principal quantum number, is n - 1.
What is the wavelength of a light with a frequency of 1.7 x 10^17 /s?
Wavelength = Speed of Light ÷ Frequency
= (2.99 × 10⁸ m/s) ÷ (1.7 x 10¹⁷ /s)
= 1.76 ×10⁻⁹ m
The wavelength of a light of frequency 1.7 x 10¹⁷ /s is 1.76 ×10⁻⁹ m.
au lie
3. What are the two categories of pure substances?
a.
b.
I
C.
d.
e.
f.
g.
h.
i.
j.
k.
1.
b.
m.
pretty sure its d and g
just my opinion
Save the ________ used to extract metals.
Answer:
Save the *minerals* used to extract metals.
Why do animals eat other organisms? ILL MARK BRAINLIEST
Animals cannot produce their own energy without consuming other organisms.
Animals eat other organisms to get water.
Animals eat other organisms to provide food for decomposers.
Animals are part of the chain that prevents the plant population from disappearing.
Why are birds considered as consumers?
Birds eat decomposers.
Birds eat plants.
Birds eat other organisms for energy.
Birds make their own energy by absorbing chemicals.
Why do you see some animals in different food chains?
Some animals consume more than one type of organism.
Some animals can jump from one food chain to another depending on the season.
Some animals are a food source for different types of decomposers.
Some animals require to eat more because they are bigger.
Why is it possible that some animals may live side by side?
Some animals may consume the same type of plants.
There is a limited amount of space found in ecosystems.
Some animals may not be in the same food chain.
There is a limited amount of water supply in some ecosystems.
Choose the best statement that explains why do organisms need energy?
Energy is necessary only for hunting.
Energy is necessary for cells to function.
Energy is necessary only to make egg and sperm cells.
Energy is only needed during the daytime.
This are the required answers based on the food chain and ecosystem.
If you have any doubts regarding on my answer. Feel free to share the doubts with me in comments section :D
Answer:Animals eat other organisms — Animals cannot produce their own energy without consuming other organisms.
Birds considered as consumers — Birds eat plants.
We see some animals in different food chain — because some animals consume more than one type of organism.
Some animals may live side by side — There is a limited amount of space found in ecosystems.
The best statement that explains why do organisms need energy — Energy is necessary for cells to function.
This are the required answers based on the food chain and ecosystem.
If you have any doubts regarding on my answer. Feel free to share the doubts with me in comments section :D
Explanation:
haz un mapa conceptual y explique con imagenes las formas , estructuras y tipos de celulas vegetales que existen en la naturaleza.
Necesito ayuda es para hoy.
Answer:
Si
Explanation:
Please help me! with this ty
Answer:
Neutron
Explanation:
Protons have a positive charge
Electrons have a negative charge
Neutrons have a neutral charge
used by rutherford in his experiment; made of two protons and two neutrons
The metal thallium occurs naturally as 30% thallium -203 and 70% thallium-205 calculate the atomic mass of thallium
Answer:
204.4 amu.
Explanation:
30% of thallium will be multiplied by the mass number of thallium-203(203). 70% thallium will be multiplied by the mass number of thallium-205(205).
Then you will add them up.
So, (0.30x203) + (0.70x205) = 204.4 amu.
The metal thallium have two isotopes with different masses. The average atomic mass of thallium is 204.4.
What is isotopes?Isotopes are atoms with same atomic number and different mass number. For example hydrogen have three isotopes namely proton, deuteron and triton with masses 1, 2 and 3 au respectively.
The average atomic mass of an atom can be calculated from the percentage abundance and masses of its isotopes as given below:
atomic mass = ∑ (% abundance/100) mass
The mass of metal thallium is calculated as follows:
Atomic mass of thallium = [tex][\frac{30}{100}\times 203] + [\frac{70}{100}\times 205]= 204.4[/tex]
Hence, the average atomic mass of thallium is 204.4 au.
To learn more about isotopes, refer the link below:
https://brainly.com/question/21536220
#SPJ2
Warm fronts are shown on weather maps as a line with blue triangles. *
A. True
B. False
Answer:
False
Explanation:
Refer to the picture for better understanding
Hope this helps :)
pls make brainliest :p
And have an amazing day <3
How dose critical mass play a role in nuclear reaction?
Answer:
How does critical mass play a role in a nuclear reaction?
Explanation:
It is the minimum amount of material needed to start a fission reaction. ... It is the minimum amount of material needed to sustain a fission reaction.
the basic principles of atomic theory were first conceived by:
The ancient atomic theory was proposed in the 5th century bc by the Greek philosophers Leucippus and Democritus and was revived in the 1st century bc by the Roman philosopher and poet Lucretius.
HELP PLEASE ANSWER THIS QUESTION
what are 4 ways carbon effects the earth