Answer:
%composition of B₂ = 4.3%
%composition of Br₆ = 95.7%
Explanation:
Given data:
Percent composition of B₂Br₆ = ?
Solution:
Total mass of B₂Br₆ = 10.8×2 + 79.9×6 = 501 g/mol
%composition of B₂ = ( 21.6 g/ 501 g ) × 100
%composition of B₂ = 0.043 × 100
%composition of B₂ = 4.3%
%composition of Br₆ = ( 479.4 g/ 501 g ) × 100
%composition of Br₆ = 0.957 × 100
%composition of Br₆ = 95.7%
I'd love some help please thank you
Answer:
the answer would be B
Explanation:
The move vigorously it is the higher the reactivity so if you put it in order the answer would be B
calculate the percentage by mass of oxygen in ammonium nitrate
Answer:
Percent composition of O is 48g80g×100%=60%
5.0g of copper is heated from 20 Celsius to 80 Celsius. How much energy it was used to heat Cu? (Specific heat capacity of Cu is 0.092 cal/g)
Answer:
the energy used to heat Cu is 27.6 Cal
Explanation:
given data
mass m = 5 g
Specific heat capacity of Cu = 0.092 cal/g
temperature T2 = 80 Celsius
temperature T1 = 20 Celsius
solution
we get here energy used to heat Cu that is express as
Q = m × c × ΔT ....................1
so here m = mass and c = specific heat capacity
and ΔT = T2 - T1
so put value in eq 1
Q = 5 × 0.092 × (80 - 20)
Q = 27.6 Cal
so that the energy used to heat Cu is 27.6 Cal
Helga has a box. She wants to determine how much the box can hold. Which measurement should she calculate?
A) Length
B) Area
C) Volume
D) Perimeter
C) volume
Explanation:
hope it helps !
Answer:
Volume. "How much the box can hold" means how much matter can fit into the box
What did most of the particles that Rutherford shot at the gold foil do? What was the surprising behavior of a few of the particles? What did he determine?
Answer:
Explanation:
Rutherford gold experiment gave the explanation to some observations made on atoms.
When he shot the gold foil, most of the [tex]\alpha[/tex]-particles passes through the foil undeflected nor absorbed. This faction of the particles propagated the foil as if there was nothing placed on their path.
The surprising behavior of a few of the [tex]\alpha[/tex]-particles was that they were deflected from their initial path on hitting the gold foil.
This implies that there is a part of the gold foil which has the same charge as the [tex]\alpha[/tex]-particles, and more massive than the particles. Thus, he was able to determine the nucleus of an atom.
the boiling point of isopropyl alcohol is 82.5°C. a student conducts an experiment and finds a boiling point of 83.1°C. what is the students percent error in this experiment?
A.0.6%
B. 0.7%
C. 1.0%
D. 99.3%
Answer:
B. 0.7%
Explanation:
Given data:
Actual boiling point = 82.5°C
Experimental boiling point = 83.1°C
Percent error = ?
Solution:
Formula:
Percent error = ( actual value - experimental value / actual value )×100
by putting values,
Percent error = (82.5°C - 83.1 °C /82.5°C) × 100
Percent error = 0.007 × 100
Percent error = 0.7 %
Negative sign shows that experimental value is greater than accepted value. It can not written in result.
What does x mean- like person x person?
Answer:
× = and
Explanation:
person and person
Explain why no experiment is a failure.
Answer:
No experiment is a failure, because anytime you mess up, you learn from your mistakes and when you try the experiment again you can fix what you messed up on last time.
Specific gravity compares the density of a substance to the density of _____.
PLEASE HELP ILL GIVE YOU 15 POINTS !!!!!!
Answer:
Specific gravity compares the density of a substance to the density of air.
Specific gravity is compared the density of a substance to the density of water.
What is specific gravity?Specific Gravity is a dimensionless quantity that can be defined as the ratio of the density of a substance to the density of the water at a particular temperature.
The mathematical formula of the specific gravity can be written as:
Specific gravity = density of substance / density of water
The density of water at 4°C is used as a reference point as water has the highest density of 1000 kg/m³. Specific gravity or relative gravity does not have any dimension as it is a dimensionless quantity.
Specific gravity is the ratio of a substance’s density to that of water at a specific temperature. The temperature plays an important role in determining the specific gravity of a substance.
Therefore, specific gravity is a characteristic of the substance at a particular temperature and pressure that also affects the specific gravity.
Learn more about Specific gravity, here:
https://brainly.com/question/9100428
#SPJ2
Please help and I will give brainliest!
I am going to put them in order
R r
R RR rR
r rR rr
18. How far does Larry move if traveling at 2m/s for 100s?
Answer:
200 m
Explanation:
Given data:
Speed of larry = 2 m/s
Time taken = 100 s
Distance travelled = ?
Solution:
Formula:
d = st
d = distance
s = speed
t = time
by putting values,
d = 2 m/s× 100 s
d = 200 m
Can someone plz help me with this science
Answer:
The answer is A.
Explanation:
The answer is A because it is talking about a living organism.
Hope this helps! :)
yrup, USP, is prepared by dissolving 850 g of sucrose in sufficient purified water to make 1000 mL of syrup. Syrup has a specific gravity of 1.31. How many milliliters of water are used to prepare two liters of syrup?
Answer:
920mL of water
Explanation:
To solve this question we need to find as first the mass that must be added of water to make 1000mL of syrup using specific gravity. Thus, we can know the volume of water that mus be added:
1.31 is 1.31g/mL. In 1000mL = 1310g/1000mL. As the mass added of sucrose is 850g, the mass of water = Volume of water is:
1310g - 850g = 460g of water = 460mL to make 1L, To make 2L the amount of water that must be added is:
460mL * 2 =
920mL of waterThe number of milliliters of water are used to prepare two liters of syrup is 920 mL of water.
Given that,
USP, is prepared by dissolving 850 g of sucrose in sufficient purified water to make 1000 mL of syrup. The Syrup has a specific gravity of 1.31.Based on the above information, the calculation is as follows:
1.31 is = 1.31g/mL.
Now
In 1000mL = [tex]1310g \div 1000mL[/tex].
Now if the mass is added so the mass of water should be equivalent to the volume of the water.
= 1310g - 850g
= 460g of water
Now
= 460mL for 1L,
To make 2L the water should be
= 460mL (2)
= 920mL of water
Learn more: brainly.com/question/23334479
An element whose atoms have the electron configuration 2-8-18-1 is
А
a transition element
B
a noble gas
an alkali metal
D
an alkaline earth metal
Answer:
A transition element atomic number 29 copper Cu
Explanation:
What is the empirical formula for propane?
Answer:
The empirical formula for propane is C3H8.
Answer:
Because propane is made up of only hydrogen and carbon _ the chemical formula is C3H8..
What happen when? sodium oxide reacts with HCL
Answer:
Sodium oxide reacts exothermically with cold water to produce sodium hydroxide solution. A concentrated solution of sodium oxide in water will have pH 14. ... For example, it reacts with dilute hydrochloric acid to produce sodium chloride solution.
model and Schrodinger's atom model?
Explanation:
the model assumes that the electron is a wave and tries to describe the regions in space orb orbitals where most likely to be found
I JUST NEED HELP!!!! ASAP!!!!
Hydrogen cyanide has the chemical formula HCN. What's the formal charge on the N atom?
A)
+2
B)
0
C)
–2
D)
–1
Answer:
Formal charge = valance electron - nonbonding electron - (1/2)bonded electron
For nitrogen atom,
Formal charge = 5 - 2 - (1/2)×6
= 5-2-3
= 0
So, the formal charge on nitrogen atom in HCN is "0".
Explanation:
The formal charge on the N atom of hydrogen cyanide, HCN molecule is 0. Option B is correct.
Formal charge is defined as the individual charge of an atom. It is represented as:
Formal charge = valance electron - nonbonding electron - (1/2)bonded electron
The valence electrons in nitrogen atom is 5, there are 2 non bonding electrons and 6 bonded electrons on N atom in HCN,
Thus, For Hydrogen cyanide molecule, the formal charge on nitrogen atom is calculated as:
Formal charge
= 5 - 2 - (1/2)×6
= 5-2-3
= 0
So, the formal charge on nitrogen atom in HCN is "0".
To know more about formal charge here
https://brainly.com/question/2081051
#SPJ2
If you knew the number of valence electrons in a nonmetal atom how would you determine the valence of the element. (Ignore hydrogen)
Answer:
The possible valances can be determined by electron configuration and electron negativity
Good Luck even though this was asked 2 weeks ago
Explanation:
All atoms strive for stability. The optima electron configuration is the electron configuration of the VIII A family or inert gases.
Look at the electron configuration of the nonmetal and how many more electrons the nonmetal needs to achieve the stable electron configuration of the inert gases. Non metals tend to be negative in nature and gain electrons. ( They are oxidizing agents)
For example Florine atomic number 9 needs one more electron to reach a valance number of 8 electrons to equal Neon atomic number 10. Hence Flowrine has a valance of -1
Oxygen atomic number 8 needs two more electrons to reach a valance number of 8 electrons to equal Neon atomic number 10. Hence Oxygen has a valance charge of -2.
Non metals with a low electron negativity will lose electrons when reacting with another non metal that has a higher electron negativity. When the non metal forms an ion it is necessary to look at the electron structure to determine how many electrons the element can lose to gain stability.
For example Chlorine which is normally -1 like Florine when it combines with oxygen can be +1, +3, + 5 or +7. It can lose its one unpaired electron, or combinations of the unpaired electron and sets of the three pairs of electrons.
What is an orbital? How does it differ from an orbit?
Answer:
An orbit is the simple planar representation of an electron. An orbital refers to the dimensional motion of an electron around the nucleus in a three-dimensional motion. An orbital can simply be defined as space or the region where the electron is likely to be found the most.
Explanation:
Answer:
An orbital on the other hand is simply the probable area where one can expect to find the maximum density of electron presence within an atom. An orbit on the other hand is simply present in a body with a certain mass, while an orbital exists for an electron as well as an atom.
Thus, these are the simple differences between Orbit and Orbitals. It is important to know the major differences, you can check out the differences between Orbit and Orbitals below:
Differences between Orbit and Orbitals
Orbit Orbitals
An orbit is the simple planar representation of an electron. An orbital refers to the dimensional motion of an electron around the nucleus in a three-dimensional motion.
It can be simply defined as the path that gets established in a circular motion by revolving the electron around the nucleus An orbital can simply be defined as the space or the region where the electron is likely to be found the most.
The shape of molecules cannot be explained by an orbit as they are non-directional by nature. The shapes of the molecules can be found out as they are directional by nature.
An orbit that is well-defined goes against the Heisenberg principle. An ideal orbital agrees with the theory of Heisenberg’s Principles.
Thus, these are the major differences between Orbit and Orbitals.
Two important ways that energy is transported in the world around us is through
Explanation:
The two ways that energy can be transferred are by doing work and by heat transfer.
12. Draw the lewis structure for the element to help you answer the question *
Answer:hope it helps
Explanation:
If an 85.0 mL container of helium gas at standard pressure is heated from 20.oC to 91oC and the pressure is increased to 2.8 atm, then what would the new volume be for the He gas
Answer: V₂ = 37.71mL
Explanation: To determine the new volume of Helium gas, use the Combined Gas Law, which states the following relationship among pressure, volume and temperature:
[tex]\frac{P_{1}V_{1}}{T_{1}} =\frac{P_{2}V_{2}}{T_{2}}[/tex]
where index 1 relates to the initial state of the gas and index 2 to the final state of the gas.
Temperature is in Kelvin, so:
T = °C + 273
For this situation, standard pressure is 1 atm. Temperatures will be:
T₁ = 20 + 273 = 293 K
T₂ = 91 + 273 = 364 K
Solving:
[tex]V_{2}=\frac{T_{2}P_{1}V_{1}}{P_{2}T_{1}}[/tex]
[tex]V_{2}=\frac{364*1*85}{2.8*293}[/tex]
[tex]V_{2}=\frac{30940}{820.4}[/tex]
[tex]V_{2}=[/tex] 37.71
The new volume of He gas is 37.71 mL.
Type the correct answer in the box.
Anna used 900 gallons of gasoline last year driving to and from work. This year, she changed jobs. She now uses only 600 gallons of gas annually.
If each gallon of gas releases 20 pounds of CO2 when burned, Anna reduced her CO2 emissions by ______%.
WILL MARK BRAINLIEST
Answer:The answer is 3.33%. Anna reduced her CO2 emissions by 3.33% from using 600 gallons of gas annually than from using 900 gallons of gasoline annually.
Explanation:
Li²O, # of Elements and Atoms
Answer:Lithium atomic orbital and chemical bonding information. There are also tutorials on the first thirty-six elements of the periodic table includes: Li²O
Please help me, Thank you!
Answer:
B. Opposite
Explanation:
When one electron is transferred from sodium to chlorine, a pair of ions with oppositely charged ions is formed.
The electrostatic attraction between the ions forms a covalent bond between them.
When atoms lose or gain electrons, they become ions due to the charge imbalance within them. If sodium lose an electron, it becomes positively charged. when the electron is gained by chlorine, it becomes negatively charged These oppositely charged ions combined to form the ionic compound.what evidence is there of energy release after chemical reaction
Answer:
loss of mass
Explanation:
your welcome :)
Plzzzzz helppppp it’s due already I’ll mark Brainly
Question 10
1 pts
Which of the following statements is true about the mass of an atom?
The mass is equal to the neutrons plus the valance electrons
The mass of an atom is equal to the protons plus the neutrons
O The mass is equal to the protons plus the electrons
The mass is equal to the mass of the protons plus the valence electrons
+ Previous
Next >
Answer:
The mass of an atom is equal to the protons plus the neutrons
need help with physical changes
Answer:
I give u three in explanation
Explanation:
Crushing the can, stomping on the can, and squishing the can