Which statement about exothermic reactions is TRUE?
A.In an exothermic reaction, energy is absorbed, bonds are broken, and the temperature decreases.
B. In an exothermic reaction, energy is released, bonds are formed, and the temperature increases.HELPPPPP ASAPPP PLZZZZ
Answer:
9
Explanation:
i think i dont know
maybe someone tell me if I'm wrong
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:
¿De que dependen las propiedades del grafeno?
¿De que ha dependido el rapido avance en el desarollo de nuevos materiales basados en formas alotropicas del carbon?
POR FAVOOR ES URGENTEEEEE
Answer:
di ko maintindihan anggulo ng isinulat
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:
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.
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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:
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
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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.
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
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
What letter represents the critical temperature?
Answer:
b
Explanation:
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.
Metals are good conductors of current.
Answer:
absolutely correct....................
when is it appropriate to form double or triple bonds in a lewis structure?
It is appropriate to form double or triple bonds in a Lewis structure when four or six electrons are shared.
A Lewis structure is a representation of a molecule using dots to show the valence electrons in the molecule. This dots are shown around the symbols of the elements.
However, in instances where four or six electrons are shared between bonding atoms, a double or triple bond is used. A double bond means that four electrons are shared. A triple bond means that six electrons are shared.
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What is the law of conservation of mass and how does it relate to chemical equations?
What does it mean for a
chemical equation to be balanced?
Answer: Matter cannot be created or destroyed in chemical reactions.
Explanation: This is the law of conservation of mass. In every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Balanced chemical equations show that mass is conserved in chemical reactions.
Which element is most likely to lose electrons in a chemical reaction?
Group of answer choices
Mg
Cl
S
Br
Answer:
Write a hypothesis for Section 1 of the lab, which is about the effect the type of material has on the absorption of sunlight on Earth’s surface. Be sure to answer the lesson question: "What factors influence the absorption of sunlight at Earth's surface?"
Explanation:
Where are halogens on the periodic table?
As the volume of a gas at 101.3kPa changes from 30mL to 95mL the volume of the gas will?
1)Increases
2) Decreases
3 Remains the same
Number 8 question need help
Answer:
where is the question
Explanation:
pls. send it
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! :)
Nung 20 g CaCO3 và hấp thụ hoàn toàn khí CO2 sinh ra vào 0,5 lit dung dịch NaOH 0,56 M .Tính nồng độ mol của muối thu được
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
HAAAAAALP MEEEEEEEEEEE
Answer:
It would contain 10.
Explanation:
The atomic number: the number of protons.
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:
what is the molarity of an hcl solution if 50.0 ml is neutralized in a titration by 40.0 ml of 0.400 m naoh? group of answer choices 0.200 m 0.280 m 0.320 m 0.500 m
The molarity of an HCl solution if 50.0 ml is neutralized in a titration by 40.0 ml of 0.400M NaOH is 0.320 M.
HOW TO CALCULATE MOLARITY:
The Molarity of an acid when involved in a titration procedure can be calculated by using the formula below:M1V1 = M2V2
Where;
M1 = molarity of acid (M)M2 = molarity of base (M)V1 = volume of acid (mL)V2 = volume of base (mL)According to this question,
M1 = ?M2 = 0.400MV1 = 50 mLV2 = 40 mLM1 × 50 = 0.400 × 40
50M1 = 16
M1 = 16 ÷ 50
M1 = 0.32M
Therefore, the molarity of an HCl solution if 50.0 ml is neutralized in a titration by 40.0 ml of 0.400M NaOH is 0.32 M.Learn more at: https://brainly.com/question/8732513?referrer=searchResults
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
You measure the amount of Oxygen released when Hydrogen peroxide is reacts with Sodium Hydroxide. You are measuring a ____Change
Chemical or physical change? No links please
¿De que ha dependido el rapido avance en el desarollo de nuevos materiales basados en formas alotropicas del carbon?
Answer:
ano pong topik po yan
cân bằng phương trình Al + HCl → AlCl3 + H2
Answer:
Explanation:
Balance the reaction of Al + HCl = AlCl3 + H2 using this chemical equation balancer!
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.
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