Number of Br atoms : 2.679 x 10²³
Further explanationThe mole is the number of particles contained in a substance
1 mol = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
[tex]\tt mol=\dfrac{mass}{MW}[/tex]
Proust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements
mass of Br in CH₂Br₂[tex]\tt mass~Br=\dfrac{2.Ar~Br}{MW~CH_2Br_2}\times mass~CH_2Br_2\\\\mass~Br=\dfrac{2.80}{174}\times 38.7=35.59~g[/tex]
mol of Br[tex]\tt \dfrac{35.59}{80}=0.445[/tex]
number of atoms[tex]\tt 0.445\times 6.02\times 10^{23}=\boxed{\bold{2.679\times 10^{23}}}[/tex]
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Answer:
the answer 32/43
Explanation:
The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them. That is, what is intended with it is to find the fourth term of a proportion knowing the other three. Remember that proportionality is a constant relationship or ratio between different magnitudes.
If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other, the direct rule of three must be applied. To solve a direct rule of three, the following formula must be followed:
a ⇒ b
c ⇒ x
So,
The direct rule of three is the rule applied in this case as follows: If the change in water level is 0.05 inches per hour, what is the change in water level after 24 hours?
change in water level=1.2 inches
To pass a decimal number to a fraction, you must:
Put the decimal number in a fraction above a 1. That is, the decimal number is the numerator, 1 the denominator.
Find an equivalent fraction. That fraction will carry in the denominator a 1, an
Finally, the change in the water level of the pond after 24 hours is 1.2 inches or what is the same inches
I am a beginner can someone give me a brainliest to start me out I would appreciate it.
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Answer:
Hi!
The best way you can receive a Brainliest is to help others. You shouldn't focus on receiving a brainliest, rather being glad you helped someone who needed it.
I hope you take this advice and answer a question! :)
pls help me with this question
Answer:
I think its a and c
Explanation:
im smrt
How would you determine an atom's charge?
Answer:
The charge of an atom is the number of protons minus the number of electrons.
How many nitrogen atoms are in the chemical
formula below?
5C8H10N402
Answer:
4 ATOME nitrogen in the formula
There are 20 nitrogen atoms in the chemical formula mentioned.
What is chemical formula?Chemical formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols of elements. It also makes use of brackets and subscripts.
Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form is called empirical formula.
It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.They are used to describe the chemical reactions.
There are four types of chemical formula:
1)empirical formula
2) structural formula
3)condensed formula
4)molecular formula
Learn more about chemical formula ,here:
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A plant's growth response to water is called _____.
hydrotropism
geotropism
gravitropism
thigmotropism
Answer:
A or Hydrotropism
Explanation:
Answer:
hydrotropism Explanation:
because hydro= water and topism= the turning part of an organism hope this helps!! <3
Can yall help me i suck at this and rlly need help
Answer:
Fireworks is exothermic
Endothermic is Cookies
Explanation:
Exothermic reactions transfer energy to the surroundings and the temperature of the surroundings increases. Endothermic reactions take in energy and the temperature of the surroundings decreases.
Hope this helps
All covalent compounds donot exist as giant aggregates. Why?
Which periodic gruop has the smallest atomic radiis
Answer:
Helium
Explanation:
A chemical formula is shown below. How many total atoms are in 2 molecules of the chemical formula shown?
C6H12N2O
Answer: 42
Explanation: I took a quiz and had the same question.
Spongebob completed his experiment. He wrote a brief summary about the investigation. He also determined that his hypothesis statement was not right and explained why it wasn't right by providing evidence from the investigation. Spongebob utilized which step of the scientific method?
Answer:
In a 7-step scientific method, Spongebob utilized the 6th step when He wrote a brief summary of the investigation, and Spongebob utilized the 7th step when He also determined that his hypothesis statement was not right and explained why it wasn't right by providing evidence from the investigation.
Explanation:
Scientific Methods are organized ways employed by scientists to tackle problems by providing solutions to the problem or make hypotheses to which other scientists build on to provide solutions to the problem.
The steps of the scientific method are:
Step 1- Understand the Problem
Step 2- Make research
Step 3- Hypothesis.
Step 4- Conduct an experiment to test the hypothesis
Step 5- Observations.
Step 6-Results/Conclusion.
Step 7- Communicate your research
When Spongebob wrote a brief summary of the investigation, which means he had already conducted an experiment and had already made necessary observations and data collection, so he was at step 6. At step 6, he had analyzed the data collected.
When Spongebob determined that his hypothesis statement was not right and explained why it wasn't right by providing evidence from the investigation, then he was at the final step of the scientific method. Step 7 tells whether the hypothesis is true or false.
Answer:
hey im spongebob
Explanation:
:D
what is the basis of modern periodic table?
Explanation:
The periodic table is an arrangement of the chemical elements, organized on the basis of their atomic numbers, electron configurations and recurring chemical properties.
What are covalent bonds
Answer:
A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding
please helppp!!!
Consider the following intermediate chemical equations.
C(s) +202(g) → CO(g)
CO(g)+302(g) → CO2(g)
How will oxygen appear in the final chemical equation?
O O2(g) as a product
O O2(g) as a reactant
O O(g) as a product
O 20(g) as a reactant
O₂(g) as a reactant
Further explanationIn chemical reactions, there is a reaction between reagents and products
Reaction:
aA + bB ⇒ cC
Substances A and B are called a reactants
Substance C is called a product
In the above reaction:
Reactants: C, O₂ and CO Products: CO and CO₂CO functions as a product in the first reaction and functions as a reactant in the second reaction
In the final chemical equation :
CO(g)+30₂(g) → CO₂(g)
O₂ is on the left so it is called the reactant
Answer: B. O₂(g) as a reactant
The Tacoma narrows bridge collapsed due to?
A. Refraction
B. Reflection
C. Diffraction
D. Resonance
What is the role of gravity in the solar system?
Answer:
Explanation:
Gravity is what holds the planets in orbit around the sun and what keeps the moon in orbit around Earth. ... Gravity creates stars and planets by pulling together the material from which they are made. Gravity not only pulls on mass but also on light.
the amount of space an object occupies is called its
PLZ HELP WILL MAKE U BRAINLIEST! what is acceleration???
Answer: Acceleration is when something accels.
Or, in simple terms, when the velocity changes rapidly to a very quick speed.
Hope this answer helps you!
Best of Regards!
How does the atomic mass of the atom change when an electron is added or removed?
If you could magically make two neutrons in the nucleus of an atom disappear, the atomic number and the electrical charge of that atom would remain unchanged. Neutrons do not carry an electrical charge so adding or removing them from the nucleus does not change the electrical charge of the nucleus. It does, however, change the mass of the nucleus. Adding or removing neutrons from the nucleus are how isotopes are created.
Protons carry a positive electrical charge and they alone determine the charge of the nucleus. Adding or removing protons from the nucleus changes the charge of the nucleus and changes that atom's atomic number. So, adding or removing protons from the nucleus changes what element that atom is! For example, adding a proton to the nucleus of an atom of hydrogen creates an atom of helium. (Actually, a few neutrons have to be added as well to make the new nucleus stable, but the end result is still helium.) Keep in mind that atoms, by definition, are electrically neutral and always contain the same number of protons and electrons.
Which phrase describes a metamorphic rock?
formed from a volcano
was once buried underground
formed from evaporating water
contains minerals that have not changed
Answer:
C: was once buried underground
Explanation:
Hope this helps!
Answer:
The correct answer you are looking for is B i have got 100% on this test.
Explanation:
hop this helps! └(^o^)┘ ↖(^ω^)↗
When 3.00 grams of methane, CH,, reacts according to the balanced equation below, how many molecules of water are produced?
CH, + 202 - CO2 + 2H20
Answer:
2.41×10²³ molecules of water
Explanation:
Given data:
Mass of methane = 3 g
Molecules of water formed = ?
Solution:
Chemical equation:
CH₄ + 2O₂ → CO₂ + 2H₂O
Number of moles of methane:
Number of moles = mass/ molar mass
Number of moles = 3 g/ 16 g/mol
Number of moles = 0.2 mol
Now we will compare the moles of water with methane.
CH₄ : 2H₂O
1 : 2
0.2 : 2 × 0.2 = 0.4 mol
Molecules of water:
1 mole = 6.022×10²³ molecules of water
0.4 mol ×6.022×10²³ molecules of water / 1mol
2.41×10²³ molecules of water
Which unit is not a measurement of volume?
cm^3
Ocm
Oml
OL
Answer:
cm is a measure of length not volume
Answer:
I think it's Cm:)
Hope this helps
The hybrid orbitals of a molecule are shown in the figure.
These hybrid orbitals were most likely formed by mixing
one s orbital and one p orbital.
one s orbital and two p orbitals.
one s orbital and three p orbitals.
O two s orbitals and two p orbitals.
Answer:
One s orbital and One p orbital
Explanation:
Is this a chemical reaction? Explain your reasoning. (Will give brainliest)
Answer:
No, it looks like there is no gas forming no foaming or burning so it is not
Explanation:
BE FIRST TO ANSWER FOR SUM GOOD!!!!!:D
Which of the following is NOT a characteristic of a compound?
A. has different properties from the elements that formed it
B. pure substance made of two or more elements
C. can be represented by a chemical formula
D. different samples have different properties
Answer:
I think it's D
sorry if I'm wrong.
Explanation:
Options that are not characteristics of compound in the question is D. different samples have different properties.
A compound can be regarded as a substance which is formed by chemical combination of two or more elements.Examples of compound are water ( H2O), Sodium chloride ( NaCl)Some of the properties of a compound are;
A compound will always has a different properties which is different from the properties of each of the elements making up the compound.A compound are formed as a result of two or more elements that combined chemically.A compound can be identified with its chemical formula.Therefore, option D is correct because a compound will only has its own properties not that
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Which pair of elements will have the same number of valence numbers
A- lithium and barium
B- gallium and germanium
C- tellurium and polonium
D- iondine and xenon
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What mass of water freezes if 5.43 kJ oh heat are released in the process
Answer:
16.3 g
Explanation:
got it right on ck
What are the names of the two categories of living organisms?
Answer:
Prokaryotes (which are bacteria and archea)
Eukaryotes (which is plants, animals, protists and fungii)
PLEASE HELP!!!!
The student is chemically combining 4 g of hydrogen with 2 g of
oxygen. The reactants have a coefficient of 2 in them. What will be the
mass of the product?
A. 12 grams
B. 10 grams
C. 8 grams
D. 6 grams
Answer: Buy ram 3500 Laramie Longhorn
Explanation:
Answer:
12
Explanation: