Solve the following problems to determine the empirical formula. Show the complete
factors to calculate number of moles, then the molar ration and finally the empirical formula.
1. Calcium bromide is a compound used in photography and the manufactur of fire extinguishing
materials. Analysis of a 20.00 gram sample of calcium bromide yields 4,02 grams of calcium and
15.95 grams of bromine. Calculate the number of moles of both calcium and bromide, then
determine the mole ratio to write an empirical formula for calcium bromide,
The empirical formula of the compound (calcium bromide) is CaBr₂
From the question given above, the following data were obtained:
Ca = 4.02 g
Br = 15.95 g
Empirical formula =?Divide by their molar mass to obtain their mole
Ca = 4.02 / 40 = 0.1005 mole
Br = 15.95 / 80 = 0.199 mole
Divide by the smallest to obtain the mole ratio
Ca = 0.1005 / 0.1005 = 1
Br = 0.199 / 0.1005 = 2
Therefore, the empirical formula of calcium bromide is CaBr₂
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How does the microscopic arrangement of particles affect the microscopic behavior of the solution?
Answer:
In a solid, the particles pack together as tightly as possible in a neat and ordered arrangement. ... With an increase in temperature, the particles gain kinetic energy and vibrate faster and more strongly. The attractive force in solids need not be stronger than in liquids or gases
27/13Al how many electron does one atome of this element contain
Answer:
An aluminium atom contains 13 electrons.
a stone is projected horizontally with 20 metre per second from the top of a tall building calculate its position in velocity after 3 seconds neglecting the air resistance .
Answer:
105m
Explanation:
u=20m/s
g=10m/s^2
t=3s
s=ut+1/2gt^2at
s=20*3+1/2*10*3*3
s=105m
What was the effect of decreasing the copper's mass?
Answer:
Decreasing the temperature of the copper made the final temperature decrease.
Heat emitted by copper reduces as copper's mass decreases. As the mass of copper lowers due to a decrease in heat gain by water, the final temperature also drops.
What is heat?The transfer of kinetic energy from an energy source to a medium, an object, or from one to the other is referred to as the creation of heat. The sun is the source of all energies. It is the natural source of solar energy, heat, and light. Thermal energy can move through three different channels: conduction, convection, and radiation.
Therefore, the increase in temperature is always proportionate to the mass of water. Thus, the final temperature will be lower if we increase the water mass. The temperature will be lower in the end. The density reduces as volume grows. Consequently, density drops as temperature rises.
Thus, heat emitted by copper reduces as copper's mass decreases. As the mass of copper lowers due to a decrease in heat gain by water, the final temperature also drops.
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Give one example of a pure substance.
Answer:
some example includes:
gold, copper, oxygen, chlorine, diamond
Explanation:
construct a Device to Regulate the
Release of Energy - Student Guide
PLEASE WRITE IN LAB REPORT FORM ASAP PLEASE HELP 75 POINTS WILL MARK BRIANLIEST
Answer:
Hi there
Thermal Energy and Chemical Reactions
The device controlled the activation as shown by the water holding room temperature for 15 seconds until activation by crushing the pills. The temperature rose 30° over two minutes,showing a measurable exothermic reaction from the Calcium Chloride dissolving in the water.
Pour 5mL water in a quart bag
Place Thermometer in the bag to make contact
Fill two gelatin 000 capsules with 1 gram of Calcium Chloride
Place capsules into the bag
Wait 15 seconds to crush the capsules while they are submerged in the water
-Temperature
0 seconds 75 degrees
15 seconds - Activation 75 degrees
30 seconds 85 degrees
60 seconds 95 degrees
90 seconds 104 degrees
120 seconds 105 degrees
Conclusion: During a reaction, thermal energy from the environment is converted into chemical energy stored in the products.
Brainliest plz
why are metals generally good conductors of electric current?
Answer:
(Hope this helps can I pls have brainlist (crown)☺️)
Explanation:
Because the atoms in metals form a matrix through which outside electrons may easily travel, metals are good conductors of electricity and heat. They generate a sea of electrons around the positive nuclei of the interacting metal ions, rather than circling their particular atoms.
The free flow of shared electrons can carry an electric current through a metal. Carbon atoms join with iron atoms to create bonds.
Magnesium (24.30) reacts with hydrogen chloride (X g) to produce hydrogen gas (2.04 g) and magnesium chloride (96.90 g). How much hydrogen chloride was used in the reaction?
Round your answer to the second decimal.
Answer:
Hydrogen Chloride is 74.64 grams.
Explanation:
Using the given information, we can find the amount of grams of hydrogen chloride that take place in the reaction.
24.30 grams of Magnesium"x" grams of Hydrogen chloride2.04 grams hydrogen gas96.90 grams of magnesium chloride.Due to the Law of Conservation of Mass, the mass of the system must remain constant. To find the value of x, make the equation below.
[tex]24.30 + x=2.04 + 96.90[/tex]
The left side represent the reactant side of the chemical reaction and the right side represents the product side.
[tex]2.04 + 96.90= 98.94[/tex]
[tex]24.30+x=98.94[/tex]
[tex]24.30 - 24.30 + x= 98.94 - 24.30[/tex]
[tex]x=74.64[/tex]
The equation shows a neutralization reaction. H2SO4 2NaOH Na2SO4 2H2O What is Na2SO4? an acid a base a salt an ion.
What results when oxygen reaches a burning splint?
Answer:
Hydrogen (H2) When a burning splint is introduced to a sample of pure hydrogen gas, it will burn with a popping sound. Oxygen (O2) When a smoldering splint is introduced to a sample of pure oxygen gas, the splint will reignite.
Answer:
The burning splinter makes hydrogen and oxygen react and you hear a pop sound.
Explanation:
why does a diprotic acid dissociate in a stepwise manner
Because they have the ability to supply exactly two protons.
Hope this helps!
A diprotic acid dissociates in a step wise manner as it has two protons and it looses one proton each in each dissociation step.
What are acids?Acids are defined as substances which on dissociation yield H+ ions , and these substances are sour in taste. Compounds HCl, H₂SO₄ and HNO₃ are acids as they yield H+ ions on dissociation.
According to the number of H+ ions which are generated on dissociation acids are classified as mono-protic , di-protic ,tri-protic and polyprotic acids depending on the number of protons which are liberated on dissociation.
Acids are widely used in industries for production of fertilizers, detergents batteries and dyes.They are used in chemical industries for production of chemical compounds like salts which are produced by neutralization reactions.
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A gas measures 140 mL at 400 K find its volume at 120 K if the pressure remains constant.
By applying Charles law, the final volume of the gas is equal to 42 mL.
Given the following data:
Initial volume = 140 mLInitial temperature = 400 KFinal temperature = 120 KTo find the final volume of the gas, we would apply Charles law:
Charles law states that when the pressure of an ideal gas is kept constant, the volume of the gas is indirectly proportional to the absolute temperature of the gas.
Mathematically, Charles law is given by the formula;
[tex]\frac{V}{T} =k\\\\\frac{V_1}{T_1} = \frac{V_2}{T_2}[/tex]
Where;
T is the temperature of an ideal gas.V is the volume of an ideal gas.Substituting the given parameters into the formula, we have;
[tex]\frac{140}{400} = \frac{V_2}{120} \\\\140 \times 120 = 400V_2\\\\16800 = 400V_2\\\\V_2 = \frac{16800}{400}[/tex]
Final volume = 42 mL.
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Help please!!!!!!!!!!!!!!!!!!!!…
Answer:
i honestly dont know how this is showing up on my thing i am 13
Explanation:
sorry i dont know at all
How many grams of solute are needed to order to prepare 100.00 mL of a 0.1000 M solution of a compound with a molecular weight of 350.0 g/mol
Answer:
i got 35 but i am as lost as you are so don't really take my answer as a trusted answer
The grams of solute are required.
The mass of solute is 3.5 g
c = Molarity = 0.1 M
M = Molar mass = 350 g/mol
V = Volume of solution = 100 mL = 0.1 L
n = Number of moles
m = Mass of solute
Molarity is given by
[tex]c=\dfrac{n}{V}\\\Rightarrow n=cV\\\Rightarrow n=0.1\times 0.1\\\Rightarrow n=0.01\ \text{moles}[/tex]
Molar mass is given by
[tex]M=\dfrac{m}{n}\\\Rightarrow m=Mn\\\Rightarrow m=350\times 0.01\\\Rightarrow m=3.5\ \text{g}[/tex]
The mass of solute is 3.5 g
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is a single cell the smallest structure that carries out our activities nesscesary for life
yep, the cell is the smallest unit in a living organism that is capable of carrying out all of the activities of life.
why would someone need to find the relative density of an object?
Answer:
The relative densities of an object and the liquid it is placed in determine whether that object will sink or float. An object that has a higher density than the liquid it's in will sink. An object that has a lower density than the liquid it's in will float.
Explanation:
Hope it helps!
The relative densities of an object and the liquid it is placed in determine whether that object will sink or float. An object that has a higher density than the liquid it's in will sink. An object that has a lower density than the liquid it's in will float.
This principle is fundamental to understanding why objects float or sink in fluids and are commonly observed in everyday situations. For example, ships and boats float on water due to their design and the distribution of weight, while heavy materials like metal sink in water because their density is greater than that of water.
Therefore, The concept of relative densities and buoyancy has significant applications in various fields, including shipbuilding, architecture, swimming, and understanding the behavior of objects in liquids.
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An ion of iron has an 26 protons, 30 neutrons, and 23 electrons. What are its atomic number, atomic mass, and net charge?
Answer:
Atomic number: 26
Atomic mass: 56
Net charge: +3
Explanation:
Write the balanced equation!!
Acid-Base Reactions: HA + BOH → BA + H2O
Sulfuric Acid, H2SO4 (aq) + potassium hydroxide (aq) potassium sulfate (aq) + water (l)
Answer:
H2SO4 + 2KOH + K2SO4 + 2H2O
Explanation:
there are 2 potassium atoms on the left side so gotta balance that and 2 for the H in the KOH so we have to add a 2 for the hydrogen in H2O..I hope this is useful..
How many elements are in the other metals group
Answer:
7 elements
Explanation:
Answer:
There are 7 elements
Explanation:
which ionization process requires the most energy?
Answer:
the second ionization energy
Explanation:
The second ionization energy is always larger than the first ionization energy, because it requires even more energy to remove an electron from a cation than it is from a neutral atom.
nguyên tử khối của Al
Answer:
26,981539 u là khối lượng nguyên tử của AI
Explanation:
What are all the chemical reaction takes place if Conc HNO3 acids leaks in seawater and at what dilution ratio it gets neutralized?
Answer:
Chemical formula: HNO₃
Melting point: −42 °C (−44 °F; 231 K)
Molar mass: 63.012 g·mol−1
Solubility in water: Miscible
Explanation:
When Conc HNO3 acid leaks into seawater presumed to be largely consisting of Sodium Chloride and other dissolved salts, I won't consider it as a chemical reaction rather it is a Physical Change. I presume this activity as a mixture when the acid been the solute becomes a contaminants
When potassium metal is placed in water, a large amount of energy is released as potassium hydroxide and hydrogen gas are produced in the reaction 2K(s) + 2H2O(l) → 2KOH(aq) + H2(g). Your lab partner says this is a redox reaction and a combustion reaction. Do you agree? Defend your answer by explaining whether or not it meets the requirements of each type of reaction.
This is a redox reaction but not a combustion reaction.
Redox Reaction
A type of chemical reaction that involves a transfer of electrons or gain of electrons between two-element. An oxidation-reduction reaction is any chemical reaction in which the oxidation number of a molecule, atom, or ion changes.
Combustion reaction
It must have two products. CO2 and H2Ooxygen in the reactant is must.
∴ The reaction is Redox ✓ not combustion
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Atoms: SC.8.P.8.7
Match the definition to proper definition:
Term:
Definition:
1. Atoms
A.Positive subatomic particles found in the
nucleus of the atom
2. Neutron
B. Negative subatomic particle found in the cloud
3. Proton
C. Substance that has no electrical charge
4. Nucleus
D. Basic building block of all matter
5. Electron cloud
E. Substance that consists of only one type of ato,
6. Electrons
F. Center of an atom with a positive charge
G. Outside of the atom with a negative charge
7. Element
Answer:
1 = D
2 = C
3 = A
4 = F
5 = G
6 = B
7 = E
The line "Come, I will make the continent indissoluble" from "For You O Democracy" implies democracy will make the nation stronger than ever before. Given this, what is most likely the meaning of indissoluble?.
Answer:
Permanent
Explanation:
I took the text
A chain reaction is created in a nuclear plant when U-235 in the fuel rods is bombarded with _____, causing the nucleus to become unstable and split.
Answer:
nuclear fission.
that's the answer
This element has an atomic number lower than aluminum and is in group 14
Answer:
that is impossible. the atomic number can only go up each group
how spectral lines are formed
=Spectral lines are produced by transitions of electrons within atoms or ions. As the electrons move closer to or farther from the nucleus of an atom (or of an ion), energy in the form of light (or other radiation) is emitted or absorbed.…
Answer:
Spectral lines are produced by transitions of electrons within atoms or ions
how long does it take for food poisoning to show up?
Answer:
with in one to two days of