Explanation:
4. limestone heat lime + carbon dioxide
The reactants in this expression above is limestone
The products of the reaction is carbon dioxide and lime
Reactant is the species that gives the product and it is usually found on the left hand side of the expression.
The product is the substance on the right hand side of the expression that forms through the experiment.
Heat is used to facilitate the reaction.
5. An exothermic reaction is a reaction in which heat is given off.
An endothermic reaction is a reaction in which heat is absorbed in the process.
An exothermic reaction is always warmer after the reaction whereas an endothermic reaction is colder at the end of the reaction.
6. Sodium salicylate is made from carbon dioxide and sodium phenoxide.
The reactants are:
Carbon dioxide and sodium phenoxide
The product is:
Sodium salicylate
Name an element with electrons in the f subshell.
Answer:
Gadolinium (Gd).......
When bethany walks across a carpet her socks pick up many electric charges. Later in the day these charges are no longer present on her socks. What most likely happened to the charges?
Answer:
When bethany walks across a carpet, her socks pick up many electric charges. Later in the day, these charges are no longer present on her socks. What most likely happened to the charges.
A. the charges disappeared.
B. The charges switched signs
C. the charges transferred to another object ✓
D. The charges broke apart into smaller particles
How many moles of Al2O3 are formed from the reaction of 6.38 mol O2 and 9.15 mol Al?
With Explanation please !
Moles of Al₂O₃ formed : 1.42
Further explanationGiven
6.33 mol O₂
9.15 mol Al
Required
moles of Al₂O₃
Solution
Reaction
4Al + 3O₂ ⇒ 2Al₂O₃
Find limiting reactant (mol : coefficient) :
Al = 9.15 : 4 = 2.29
O = 6.38 : 3 = 2.13
O₂ as a limiting reactant(smaller ratio)
Mol Al₂O₃ based on mol O₂ as a limiting reactant
From equation, mol ratio Al : Al₂O₃ = 4 : 2, so mol Al₂O₃ :
= 2/3 x mol O₂
= 2/3 x 2.13
= 1.42
A sonar device on a ship sends ultrasound waves under the water to locate a submarine. It takes
the ultrasound wave 5 seconds to travel from the device to the sunken submarine and back
again. How far below the surface is the sunken submarine? (Be sure to use the proper units of
measure) * 5
Answer:
3750 m
Explanation:
We must first know the speed of sound in water in order to solve this problem.
So, speed of sound in water = 1500 meters per second
Now time taken = 5 seconds
Given that;
v = 2x/t
where x is the distance below;
vt = 2x
x = vt/2
x = 1500 * 5/2
x = 3750 m
how many moles are there in 9.86x10^25 molecules of co2?
Answer:
164moles
Explanation:
Given parameters:
Number of molecules of CO₂ = 9.86 x 10²⁵molecules
Unknown:
Number of moles = ?
Solution:
To solve this problem, a mole of any substance contains the Avogadro's number of particles.
In that;
6.02 x 10²³ molecules makes up 1 mole of a substance
9.86 x 10²⁵molecules contains [tex]\frac{9.86 x 10^{25} }{6.02 x 10^{23} }[/tex] = 1.64 x 10²moles
The number of moles is 164moles
Clyed made a diagram to compare characteristics of two kinds of plants
Answer:
maybe
Explanation:
you could be high risk for coronavirus if you have asthma and are not safe.
nonmetals break easier than metals we say nonmetals are weak or ___
Answer:
brittle
Explanation:
Answer:
brittle
Explanation:
In the formula for an ionic compound, the negative ion is
always written first.
TRUE
FALSE
Answer: False
Explanation: In the written form of an ionic compound, the positively charged cation always comes before the negatively charged anion. For instance, the written name for is calcium chloride because the compound has calcium () cations and chloride () anions.
In the formula for an ionic compound, the negative ion is always written first. This statement is false.
What do you mean by an ionic compound ?The term an ionic compound is defined as a chemical compound composed of ions carried together by electrostatic forces termed ionic bonding.
The compound is neutral charge, but made up of positively charged ions called cations and negatively charged ions called anions.
The compounds that affect a metal binding with either a non-metal or a semi-metal will display ionic bonding.
In the formula an ionic compound, the positively charged cation always comes before the negatively charged anion.
For example, the written name for is calcium chloride because the compound has calcium (+) cations and chloride (-) anions.
Thus, In the formula for an ionic compound, the positive ion is always written first.
To learn more about an ionic compound, follow the link;
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Will give brainliest for correct answer and quick answer! help ;w;
Which equation correctly represents the ionization process?
a. element + ionization energy --> ion+1 - 1 electron
b. element + ionization energy --> ion-1 + 1 electron
c. element + ionization energy --> ion+1 - 1 electron
d. element + ionization energy --> ion+1 + 1 electron
Answer:
c is correct answer my girl f
John is running the 1600-meter race at his school's track meet. He runs the full 1600
meters in 6.5 minutes. What is John's average speed in meters/second rounded to
the nearest tenth?
Answer:
4.1m/s
Explanation:
6.5min=6×60+30=390s
v=1600÷390=4.1m/s
John is running the 1600-meter race at his school's track meet. He runs the full 1600 meters in 6.5 minutes, then his average speed of John would be 4.1 meters per second.
What is speed?The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object.
As given in the problem, John is running the 1600-meter race at his school's track meet. He runs the full 1600 meters in 6.5 minutes,
The distance covered by the John = 1600 meters
The time taken by the John = 6.5 minutes
=6.5×60
=390 seconds
The speed of the John = 1600/390
= 4.1 meters per second
Thus,the speed of the John n meters/second rounded to the nearest tenth would be 4.1 meters per second.
To learn more about speed from here, refer to the link;
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True or False: Wind can cause ocean currents
Answer:
true
Explanation:
Answer:
True the wind causes waves in the ocean
Explanation:
Explain what happens during cytokinesis. This needs to be detailed.
Answer:
During cytokinesis, which is a physical process of cell division, the cells divide the cytoplasm of a parent cell into two daughter cells. The ring on the outside of the cell which is also known as a contractile ring, shrinks at the equator of the cell which causes pinching, and the plasma membrane goes inward. After all that happens there’s something called a cleavage furrow which is the formation of a dip between the two cells while they are splitting.
(You can sum it up, but I hope this helps!)
Which of the following has the greatest mass?
Select one:
a.They all have the same mass.
b.One mole of gold.
c.One mole of mercury.
d.One mole of barium.
Answer:
I guess one mole. of mercury
Explanation:
because mercury is denser
The one that has the greatest mass
c. One mole of mercury.How to find the greatest massTo determine which of the given options has the greatest mass, we need to compare the molar masses of the substances.
The molar mass is the mass of one mole of a substance and is expressed in grams per mole (g/mol).
The molar masses of the given substances are:
Gold (Au): 197.0 g/mol
Mercury (Hg): 200.6 g/mol
Barium (Ba): 137.3 g/mol
Comparing the molar masses, we can see that one mole of mercury (Hg) has the greatest mass among the options provided.
Therefore, the correct answer is:
c. One mole of mercury.
Learn more about mass at
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Why is paper towel absorbing water a chemical change
Answer:
it is not a chemical change
Explanation:
it is a physical change as a paper towel can be dried in the sun to turn into a regular paper towel thus proving that a paper towel absorbing water is a physical change not a chemical change
What was Juno's destination?
A. Earth
B. Jupiter
C. Sun
D. Moon
Explanation:
Juno's primary goal is to reveal the story of Jupiter's formation and evolution. Using long-proven technologies on a spinning spacecraft placed in an elliptical polar orbit, Juno will observe Jupiter's gravity and magnetic fields, atmospheric dynamics and composition, and evolution.
Answer:
Jupiter.
Explanation:
If the rate constant of a reaction is 0.010 L/mols at 30 °C, calculate the rate constant at 100 °C assuming the rate doubles for each 10 °C rise in temperature.
It says that the answer is 1.3 L/mols, but I don't understand why.
Answer:
1.3L/mols
Explanation:
At 30°C the rate constant is 0.010L/mols
As the rate doubles for each 10° rise in temperature:
At 40°:
0.010L/mols*2 = 0.020L/mols
At 50°C:
0.020L/mols*2 = 0.040L/mols
At 60°C:
0.040L/mols*2 = 0.080L/mols
At 70°C:
0.080L/mols*2 = 0.160L/mols
At 80°C:
0.160L/mols*2 = 0.320L/mols
At 90°C:
0.320L/mols*2 = 0.640L/mols
And at 100°C:
0.640L/mols*2 =
1.280L/mols ≅
1.3L/molsplease help me currently failing junior year
Answer:
option B
hope this helps :D
#3 What size container would 67.3mol CO2 need at STP?
Answer:
The volume of the container would be 1507 L
Explanation:
These question can be solved in two different ways:
Let's do the short road.
We know that 1 mol of anything at STP conditions occupies 22.4 L
By a rule of three:
1 mol contains 22.4L at STP
Then, 67.3 mol of gas would be contained in (67.3 . 22.4) /1 = 1507.5 L
We assume CO₂ as an Ideal Gas, so we can apply P . V = n . R . T
At STP, T is 273.15K and P = 1 atm. We replace:
1 atm . V = 67.3 mol . 0.082 . 273.15K
V = (67.3 mol . 0.082 . 273.15K) / 1 atm → 1507 L
how many liters is 1.9 mol of Cl2 at STP?
Answer:
V = 42.6 L
Explanation:
Given data:
Number of moles of Cl₂ = 1.9 mol
Temperature and pressure = standard
Volume occupy = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
By putting values,
1 atm × V = 1.9 mol ×0.0821 atm.L /mol.K × 273.15 k
V = 42.6 atm.L / 1 atm
V = 42.6 L
what do i do if my crush likes another girl?
Answer: tell that person how u feel
Explanation: If it doesn’t go well ask if u can just stay friends
Answer:
personaly i wouldn't get involved but you wanna tell him/her how you fell go for it.
An object has a mass of 22.5 grams and a volume of 13.7 cm3. What is the density?
Answer:
M=22.5 grams
Volume= 13.7 cm^3
p=m/v
Divided and p= 1.64 g/cm^3
in this equation, what shows that transmutation has taken place?
PLEASE ANSWERR!
Answer:
B
Explanation:
I'm 99.9% sure that was the answer when I had this question last year
Answer:
C, the nucleus of an atom changes.
Explanation:
Ape.x
16) Which scientist and model/experiment unintentionally discovered the electron?
A. Rutherford - Gold Foil Experiment/Nuclear
B. Thompson - Cathode Ray Tube/Plum Pudding
C. Bohr Model - Planetary Model
D. Schrodinger - Electron Cloud Model
Answer:
B. Thompson - Cathode Ray Tube/Plum Pudding
Explanation:
The scientist and the model/experiment that unintentionally discovered the electron was the Thompson's - Cathode Ray Tube/Plum Pudding.
Experiments on the discharge tubes was performed by J.J Thomson in 1897 and this led to the discovery of the electron as a subatomic particle.
The properties of the cathode rays were studied and presented by Thomson in his work at that time.
He observed that cathode rays move in a straight line normal to the cathode and can cast the shadow of an object placed along their path. They possess kinetic energy and so can cause the motion of a mechanical paddle wheel placed along their path They attract positive charges and repel negative charges.What are the coefficients when the chemical equation below is balanced?
___ FeS + ____ O2 = ___ Fe2O3 + ___ SO2
Select one:
a)1, 1, 1, 1
b)4, 6, 1, 2
c)4, 7, 2, 4
d)2, 3, 1, 2
Answer: c)4, 7, 2, 4
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products formed must be equal to the mass of reactants taken.
In order to get the same mass on both sides, the atoms of each element must be balanced on both sides of the chemical equation.
The balanced chemical equation will be :
[tex]4FeS+7O_2\rightarrow 2Fe_2O_3+4SO_2[/tex]
The coefficients when the chemical equation below is balanced are 4, 7, 2, 4
How many moles of Ca are in 3.75 x 1025 atoms of Ca? Group of answer choices 3.75 mol 0.016 mol 2.26 x 1049 mol 62.3 mol
Answer:
62.3 moles of Ca
Explanation:
1 mole of a substance is defined as 6.022x10²³ particles of this substance. For example:
1mol of electrons = 6.022x10²³electrons
1mol of atoms = 6.022x10²³atoms
1 mol of molecules = 6.022x10²³ molecules
And 1mol of atoms of Ca = 6.022x10²³ atoms of Ca
That means 3.75x10²⁵ atoms of Ca are:
3.75x10²⁵ atoms of Ca * (1 mole of Ca / 6.022x10²³ atoms) =
62.3 moles of Ca
please help me !!! im failing :(
Answer: H
H- C- H
H
Explanation:
Lewis structures are the structures which represent the valence electrons of the element around the chemical symbol of the element.
Carbon is an element which belong to group 14. Atomic number of carbon is 6 that means it contains 6 electrons, Thus the electronic configuration is represented as: [tex]1s^22s^22p^2[/tex] . Thus the valence electrons are 4.
Hydrogen is an element which belong to group 1. Atomic number of hydrogen is 1 that means it contains 1 electron, Thus the electronic configuration is represented as: [tex]1s^1[/tex] . Thus the valence electron are 1.
The four valence electrons of carbon are shared with one valence electron of hydrogen each.
A sample of iron (Fe) contains 2.10 x 1023 atoms. The mass of this sample of iron in grams is... (1 mol of atoms = 6.022 x 1023 atoms = 55.8 grams)
a.) 19.59
b.) 0.3499
c.) 1.17 x 10259
d.) 6.24 x 10-39
Answer:
Mass = 19.53 g
Explanation:
Given data:
Number of atoms of iron = 2.10 ×10²³ atoms
Mass of iron = ?
Solution:
The number 6.022 ×10²³ is called Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
1 mole contain 6.022 ×10²³ atoms
2.10 × 10²³ atoms × 1 mol / 6.022 ×10²³ atoms
0.35 mol
Mass of iron atoms:
Mass = Number of moles × molar mass
Mass = 0.35 mol × 55.8 g/mol
Mass = 19.53 g
how many moles are in 3 grams of Hydrogen gas.
Answer:
Number of moles = 1.5 mol
Explanation:
Given data:
Number of moles = ?
Mass in gram = 3 g
Solution:
Formula:
Number of moles = mass/molar mass
Molar mass of hydrogen gas = 2.02 g/mol
By putting values,
Number of moles = 3 g / 2.02 g/mol
Number of moles = 1.5 mol
A sample of SO2 gas has a volume of 2.36 L at a temperature of 27°C. At what temperature will the gas have a volume of 1.45 L?
Answer:
New temperature T2 = 16.59°C Approx
Explanation:
Given:
Old volume V1 = 2.36 L
Old temperature T1 = 27°C
New volume V2 = 1.45 L
Find:
New temperature T2
Computation:
Using Charles's Law;
V1T2 = V2T1
(2.36)(T2) = (1.45)(27)
New temperature T2 = 16.59°C Approx
18. Which factor does NOT affect weather?
O mountains
O phases of the moon
O cloud cover
O large bodies of water
