Answer:
nCaCO3 = 20/100 = 0,2 mol
CaCO3 --> CaO + CO2
0,2 ----------------> 0,2
nNaOH = 0,5.0,56 = 0,28 mol
=> T = nNaOH/nCO2 = 0,28/0,2 = 1,4
=> sản phẩm tạo ra bao gồm : Na2CO3 và NaHCO3
NaOH + CO2 --> NaHCO3
x -------> x --------> x
2NaOH + CO2 --> Na2CO3 + H2O
y ---------> 1/2y ---> 1/2y
ta có : nCO2 = nMuối = 0,2 mol
=> CmMuối = 0,2/0,5 = 0,4 M
Where are halogens on the periodic table?
Bernice created a table using her knowledge of charged and uncharged objects. Which statement best explains why the table is incorrect?
Charged Object Uncharged Object
Negatively charged attract
Positively charged repel
The negatively charged and uncharged objects do not attract.
A positively charged object attracts an uncharged object.
Both positive and negative charges repel uncharged objects.
An uncharged object neither attracts nor repels charged objects.
Answer:B
Explanation:
A positively charged object attracts an uncharged object.
A positively charged object attracts an uncharged object statement is in correct in the table. Hence option B is correct.
What are charge?Charge are defined as a subatomic particle's ability to experience force when exposed to an electric and magnetic field. The value that the atom reaches after removing or gaining electrons is known as charge. Only ions that comply with the octat rule are stable. Atoms or groups of atoms with an electric charge are referred to as ions. Cations are positive-charged ion particles. Anions are ion types that have a net negative charge.
A charged object will cause an opposing charge to be applied to an uncharged object when it is brought close to the charged one. These two things are drawn to one another because opposing charges attract one another. Other charged items are drawn to a charged object whereas uncharged objects are repelled by it.
Thus, a positively charged object attracts an uncharged object statement is in correct in the table. Hence option B is correct.
To learn more about charge, refer to the link below:
https://brainly.com/question/19886264
#SPJ2
5. What is a habitat?
a) An area of human development
b) A protected area for endangered species
c) The natural home or environment of an animal, plant, or other organism
d) An area where no species live
It's for science
Answer:
c) The natural home or environment of an animal, plant, or other organism
Explanation:
Please note that in order to post questions in Science, you must post in Science section, but not in History. You are asking a wrong question in the wrong section.
Thank You! Please Mark Brainliest! :)
How many electrons are there in an atom with 3 protons?
Answer:
3 electrons
Explanation:
For every proton there is an electron.
Answer:
3 electrons
Explanation:
atoms are neutral in electrical charge because they have the same number of electrons as protons.
What letter represents the critical temperature?
Answer:
b
Explanation:
acid + base —> salt + water
What type of reaction is this?
[tex]\sf{Acid}+\bf{Base}\longrightarrow \tt{Salt}+\bold{Water }[/tex]
These type of reaction is called as Neutralization Reaction.
cân bằng phương trình Al + HCl → AlCl3 + H2
Answer:
Explanation:
Balance the reaction of Al + HCl = AlCl3 + H2 using this chemical equation balancer!
Metals are good conductors of current.
Answer:
absolutely correct....................
Unless otherwise instructed, you may refer to the periodic table in the Chemistry: Problems and Solutions book for this question.
Which element belongs to the p-block?
cobalt
oxygen
rubidium
hydrogen
Which two elements are in the same group based on their atomic model?
Please help me with this ASAP.
Answer: 1 and 2
i think
Explanation:
write the stracture of 2,2-dimetyl butane
Answer:
Explanation:
Let's break it down:
Butane- A 4 carbon alkaneMethyl - A CH₃ group2,2 - Both the Methyl groups are attached at carbon 2We can now draw the structure of 2,2-dimethyl butane using the following steps:
Draw the backbone (butane)Draw the substituents (2 methyl groups at carbon 2)What chemical compound is produced as a result of photosynthesis?
a
Answer: Specifically, plants use energy from sunlight to react carbon dioxide and water to produce sugar (glucose) and oxygen.
Explanation:
Number 8 question need help
Answer:
where is the question
Explanation:
pls. send it
A gas has a volume of 275 mL and a pressure of 3 atm. What is the new volume if the pressure decreases to 1.8 atm?
Answer:
Use Boyles law.
Given:
P1=3atm
V1=275mL
P2=1.8atm
V2=?
P1V1=P2V2
3x275=1.8xV2
V2=3x275/1.8
V2=458.3mL
Help meeeeeeeeeeeeeee
Answer:
whatttttttttttttttttttttttt
Answer:
Breaking glass - chemical change
popsicle - physical
milk - chemical
bread - physical
roasting - chemical
egg - chemical
fireworks - chemical
mixing something with water - chemical
popcorn - chemical
colouring hair - physical
melting chocolate - physical
crumpled paper - physical
rusted nails - chemical
crushed can - physical
cooked egg - chemical
bending metal - physical
melting ice - physical
bleaching clothes - chemical
If u want to differentiate between chemcial and physical change u need to remember this-
physical change - no new substance is formed (Even for melting of ice it's still water) and it can be reversible, except for some cases like tearing of paper
chemical change - a new substance is formed
Which immunization is available to prevent communicable disease and illness?WILL MARK BRAINLIEST 30 PTS
bronchitis
diabetes
measles
strep throat
Measles is a communicable disease that requires immunization to prevent illness when exposed to it.
Measles is a communicable disease and highly contagious. It is usually very serious in children. The disease can be contacted through droplets in the air, physical contact and through mother-to-child transmission.
It is a very serious disease as it is caused by a virus which replicates very fast in the throat and nose thereby creating symptoms such as runny nose, coughing, sneezing and is usually accompanied with a rash.
The severity and death rates is what gave rise to the creating of a measles vaccine which is usually given to babies after birth to make them immune to the potential exposure to the virus.
Diabetes, bronchitis and strep throat have no vaccine as they can always be treated or managed with over-the-counter drugs.
Read more on https://brainly.com/question/25249487
Thực hiện chuỗi phản ứng sau: CaCO, CaO CaSO, SO₂ → K₂50₂
Answer:
nnhnhgnklhnhmkghklmfmg
Explanation:
cvgngh kcvl vl gkh kn hg
Drag the item from the item bank to its corresponding match.
These are the elements or compounds that enter into a chemical reaction.
drag an
These are the substance(s) formed in a chemical reaction.
drag an
These are the reactants in the chemical equation C6H1206 +602 --> 6CO2 + 6H20
drag an
These are the reactants in the chemical equation 6 CO2 + 6H2O --> C6H1206 + 6 02
drag and
These are the reactants in the chemical equation 2 H2 + 02 --> 2 H2O
These are the reactants in the chemical equation 2 H2O --> 2 H2 + O2
Answer:
These are the elements or compounds that enter into a chemical reaction: Reactants
These are the substance(s) formed in a chemical reaction: Products
These are the reactants in the chemical equation C6H1206 +602 --> 6CO2 + 6H20: C6H1206 and 602
These are the reactants in the chemical equation 6 CO2 + 6H2O --> C6H1206 + 6 02: 6 CO2 + 6H2O
These are the reactants in the chemical equation 2 H2 + 02 --> 2 H2O: 2H2 and O2
These are the reactants in the chemical equation 2 H2O --> 2 H2 + O2: 2H2O
If 83.6 grams of H2 and 257 grams of N2 react, how many grams of ammonia will be produced?
The mass of ammonia that would be produced is 312.5 g
First, we will write a balanced chemical equation for the reaction
The balanced chemical equation for the reaction is
3H₂(g) + N₂(g) → 2NH₃(g)
This means
3 moles of hydrogen gas reacts with 1 mole of nitrogen gas to produce 2 moles of ammonia.
First, we will determine the number of moles of each reactant present
For Hydrogen (H₂)
Mass = 83.6 g
Molar mass = 2.016 g/mol
Using the formula
[tex]Number\ of\ moles = \frac{Mass}{Molar\ mass}[/tex]
Number of moles of H₂ present = [tex]\frac{83.6}{2.016}[/tex]
∴ Number of moles of H₂ present = 41.468254 moles
For Nitrogen (N₂)
Mass = 257 grams
Molar mass = 28.0134 g/mol
∴ Number of moles of N₂ present = [tex]\frac{257}{28.0134}[/tex]
Number of moles of N₂ present = 9.174181 moles
Since,
3 moles of hydrogen gas reacts with 1 mole of nitrogen gas to produce 2 moles of ammonia
Then,
27.522543 moles of hydrogen gas will react with the 9.174181 moles of nitrogen gas to produce 18.348362 moles of ammonia
∴ 18.348362 moles of ammonia will be produced during the reaction
Now, for the mass of ammonia that would be produced
From the formula
Mass = Number of moles × Molar mass
Molar mass of ammonia = 17.031 g/mol
Mass of ammonia that would be produced = 18.348362 × 17.031
Mass of ammonia that would be produced = 312.49095 g
Mass of ammonia that would be produced ≅ 312.5 g
Hence, the mass of ammonia that would be produced is 312.5 g
Learn more here: https://brainly.com/question/13902065
HELPPPPP ASAPPP PLZZZZ
Answer:
9
Explanation:
i think i dont know
maybe someone tell me if I'm wrong
what is formed when the number of electrons is changed?
Answer:
Explanation:
Whether the electrons are added or given away makes no difference to the name given to parent atom -- It is called an ion which means that it has a charge. The word atom is reserved for something on the periodic table that has no charge.
Answer: Chemical bond formed when one or more electrons are transferred from one atom to another.
Explanation: Give me the brainiest
Which of the following animals is not a first-order prairie consumer? help fast
hawk
gopher
deer
squirrel
Answer:
The answer would be the hawk.
Explanation:
First-order consumers directly depends on grass or plants for survival.
A hawk gets its food from eating animals.
Again, hope this helps :D
What is the temperature of Spica?
Answer:
Mark me brianliest plzzzzzzzzzzzz (puppy eyes) plz
Explanation:
22,400 Kelvin
22,400 KelvinSpica A and B are both classified as B-type stars and are very hot, with surface temperatures of 22,400 Kelvin and 18,500 Kelvin respectively. The primary component has a luminosity of some 12,100 Suns while the secondary shines with the power of 1500 Suns.
why does the total volume of water and alcohol decrease when the liquids were mixed together?
Answer: I think the alcohol molecules slip between the water molecules and take up that space, so you have less that you started with.
Explanation:
Someone help me with this I will make you brain
Answer:
D, took the test
Explanation:
Answer:
D: To show how using a list of examples can strengthen a claim
Hope this helps! <3
Which is smaller 1.44 or 1.2544
Answer: 1.2544
Explanation:
if you look at the number 1 and 1 are the go to the next number 4 and 2 aren't so 1.44 is bigger while 1.2544 is smaller.
Answer:
1.2544
Explanation:
2. If Ben ran for 15 minutes and went 120 meters, how fast did he run?
Answer:
8m/min
Explanation:
120 m / 15 min = 8 meters per min
A student states that a graduated cylinder contains 150 mL of water the statement is
Answer:
Explanation:
An Observation
What percentage of the Earth can a satellite reach at any given time? 100% 60% 40% 25%
Answer:
The answer should be 60%.
Answer:
40% is correct
Explanation:
Someone pls help me I will make you you brain
Answer:
A
Explanation:
it's Conventional Movement