Explanation:
When Sulphuric acid is slowly poured into water in a beaker the beaker becomes hot and this is exothermic reaction
when ammonium chloride is dissolved in water in a beaker the beaker becomes cold and this is endothermic reaction
An example of an exothermic reaction is rusting or iron, nuclear fission. Examples of endothermic reactions are the melting of liquid and the evaporation of water.
What is a chemical reaction?A chemical reaction is a process in which one or two substances or compounds, called reactants, react or get mixed with each other and form a totally new compound called a product.
Exothermic reactions are those in which energy is released into the environment after the reaction. The reactant has more energy than the products.
Endothermic reactions are those in which energy is absorbed from the environment. The product has more energy than the reactants.
Thus, rusting on iron or nuclear fission are two examples of exothermic reactions. Liquid melting and water evaporation are two instances of endothermic processes.
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write the general strucktures of
A. ketone b. aldehyde c. carboxylic acid d. ester
A.ketone
R-CO-R
B.aldehyde
R-CH=O
c.carboxylic acid
R-COOH
d.ester
R-CO-O-C-R
HELP IGNORE IF YOU DON'T KNOW BRAINLIEST!!
Commercial vinegar is a 5.00% by mass aqueous solution of ethanoic acid. FIND MOLARITY of ethanoic acid in vinegar. Density of vinegar
is 1.00 g/mL
Answer:
What ever the other person said
Explanation:
Which variable increases when potential energy increases?
Answer:
Height and mass
Explanation:
The potential energy of a body is the energy due to the position of a body.
It is mathematically expressed as:
Potential energy = m g h
m is the mass of the body
g is the acceleration due to gravity
h is the height of the body
Acceleration due to gravity on the earth surface is a constant.
As mass and height of a body increases, the acceleration due to gravity will also increase.
During laparoscopic surgery , carbon dioxide gas is used to expand the abdomen to help create a larger working space. If 4.80 L of CO 2 gas at 18 °C at 785 mmHg is used, what is the final volume , in liters, of the gas at 37 degrees * C and a pressure of 745 mmHg if the amount of CO 2 does not change ?
Answer:
5.37 L
Explanation:
To solve this problem we need to use the PV=nRT equation.
First we calculate the amount of CO₂, using the initial given conditions for P, V and T:
P = 785 mmHg ⇒ 785/760 = 1.03 atmV = 4.80 LT = 18 °C ⇒ 18 + 273.16 = 291.16 K1.03 atm * 4.80 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 291.16 K
We solve for n:
n = 0.207 molThen we use that value of n for another PV=nRT equation, where T=37 °C (310.16K) and P = 745 mmHg (0.98 atm).
0.98 atm * V = 0.207 mol * 0.082 atm·L·mol⁻¹·K⁻¹ * 310.16 KAnd we solve for V:
V = 5.37 LCan you please help on 17 and 18 pleaseeee
Answer:
17. Yes, it represents a chemical reaction. This is because new substances were formed from the original substance.
18. (a) Formation of new substances
(b) Evolution or absorption of large quantity of heat
(c)Change in mass of substances
Explanation:
17. In the model above, molecules of a compound of carbon and hydrogen (molecular formula is C2H6) combines with molecular oxygen (O2) to produce two new substances; a compound composed of two oxygen atoms and one carbon atom (CO2) and another compound composed of two atoms of hydrogen and one atom of oxygen (H2O). Since the new substances formed are completely different from the original substances, it a chemical reaction. Also, a large volume of heat would have been given off.
18. To determine if a chemical reaction has occurred, the following observations can be looked out for.
a. Formation of new substances different entirely from the original substances
b. Evolution or absorption of large quantity of heat during the change. Check whether the vessel containing the substances gets hotter or colder.
c. Change in mass of substances. Since new substances are formed in a chemical reaction, there is usually a significant change in mass of the products and reactants.
compound
element + element
1:Synthesis
2:Decomposition
3:Single Replacement
4:Double Replacement
5:Combustion
Answer:
4
Explanation:
Because of single replacement the ideal shape comes in form
How many moles are in 347 grams of HBr
Answer:
4.289 mol
Explanation:
Given that the molar mass of HBr (known as Hydrobromic Acid or Hydrogen Bromide) has a molar mass of 80.91 g/mol.
To find the number of moles, we have the formula
(Grams of the substance ÷ moles of the substance) * (molar mass of the substance in grams ÷ one mol)
Here the Grams of the substance = 347grams,
Moles of the substance =?
Molar mass of the substance = 80.91 g/mol
By cross multiplying, we have
347 grams * 1 mol = Z * (80.91)
Z = 347 grams ÷ 80.91g/mol
Z = 4.289 mol
Jasmine and her partner want to test to see if there is a relationship between how much of her solar panel is exposed to sunlight and how fast her solar car will move. She uses a piece of paper to cover the solar panel different amounts of her solar panel. The chart below shows the data she collected.
What is the independent or manipulated variable for this experiment?
The average of the trials
The speed in centimeters per second
The size of the solar panel
The amount of solar panel covered
Answer:
The amount of solar panel covered
Explanation:
The variable that is the independent one is the one that Jasmine is changing. In this case, it is the amount of solar panel covered, via a piece of paper.
Answer:
D: The amount of solar panel covered
Explanation:
iii. A sound wave can be modelled by using a slinky spring. A wavelength in this model is...
a. the distance between a rarefaction and a compression.
b. the length of one compression.
c. the length of one rarefaction.
d. the distance between two rarefactions,
Answer: d. the distance between two rarefactions,
Explanation:
Wavelength is the distance between two identical adjacent points in a wave. This means that it is the distance between two adjacent compressions or two adjacent rarefactions.
Wavelengths are inversely related to frequency because the longer the wavelength, the less the number of wave cycles per second.
Use the graph to answer these questions. The total energy of the reactants is –3,811.92 kJ. –1,273.02 kJ. –2,538.90 kJ.
Answer:
its -3,811.92 aka.) A
Explanation:
The overall enthalpy of the reaction is represented in the graph by the letter A. The activation energy is represented by the letter B and the activated complex is represented by C.
What is an energy diagram of a reaction ?The energy diagram of a reaction represents the energy change with respect to the rate of the reaction. It clearly depicts the energy profile of reactants and products, transition state of the reaction, activation energy and the overall enthalpy of the reaction.
The given diagram represents the energy profile for the photosynthetic reaction. The state with the highest activation energy is called transition state of the reaction. The minimum energy that must be acquired by the reactants to overcome the barrier potential is called activation energy.
For the given graph, the activation energy is represented by the letter B. The overall enthalpy of the reaction is represented in the graph by the letter A and the activated complex is represented by C.
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Your question is incomplete. But your complete question probably was:
Letter__shows the overall enthalpy of reaction.
Letter___shows the activation energy for the reaction
The activated complex is represented by
Many plants obtain glucose through the process of ___
Answer:
vb
Explanation:
b
Answer:
photosynthesis
Explanation:
what were the reslt of aurangzeb's religion policy ? what measures did he takes
Answer: The religious fanaticism of Aurangzeb overshadowed his virtues. His reversal of Akbar's policy of religious toleration resulted in weakening the entire structure of the Mughal empire. It led to several conflicts and wars in different parts of the country.
How many ions are in
1.50 grams of Na+
Answer:Multiple the moles of Na2 SO4 that you found just
Explanation:
Ions are formed by gaining and donating the valence electrons from the outer shells. Sodium has an extra electron and forms cations. In 1.5 grams of Na⁺, there are 0.0652 moles ions.
What are cations?Cations are said to be the ions that are formed by donating electrons from their valence shell. They tend to donate their electrons to form ionic bonds with another atom that accepts the electrons.
The mass and the molar mass of the cation can be used to calculate the number of moles contained in the atom or the ion.
Given,
Mass of sodium ions = 1.50 grams
The molar mass of sodium ions = 22.98 amu
The number of moles of sodium cation is calculated as:
Moles (n) = mass ÷ molar mass
n = 1.50 ÷ 22.98
= 0.0652 moles
Therefore, 0.0652 moles are present in 1.50 grams of sodium ions.
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What is the volume of a sample that has a mass of 20 grams and density of 4 g/mL?
Answer:
5 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question we have
[tex]volume = \frac{20}{4} \\ [/tex]
We have the final answer as
5 mLHope this helps you
when a neutral atom gains or loses electrons, it becomes charged and is called ain)!______________
What type of reaction is P4 + 3O2 = 2P2O3
Answer:
synthesis
Explanation:
hope this helps
The given reaction is a type of synthesis reaction.
• The reactions, which takes place when two distinct molecules or atoms associate to produce a distinct molecule or compound is known as synthesis reactions.
• The synthesis reactions are one of the prime categories of chemical reactions that comprise combustion reactions, single displacement, and double displacement reactions.
• In synthesis reactions, energy is released and the reaction is exothermic, in some cases, endothermic is also possible.
• In the given reaction atoms of phosphorus and oxygen combines to produce the compound phosphorus oxide.
Thus, the given case is an example of synthesis reaction.
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how much CaCO3 would have to be decomposed to produce 247 g of CaO
441 g CaCO₃ would have to be decomposed to produce 247 g of CaO
Further explanationReaction
Decomposition of CaCO₃
CaCO₃ ⇒ CaO + CO₂
mass CaO = 247 g
mol of CaO(MW=56 g/mol) :
[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{247}{56}\\\\mol=4.41[/tex]
From equation, mol ratio CaCO₃ : CaO = 1 : 1, so mol CaO :
[tex]\tt \dfrac{1}{1}\times 4.41=4.41[/tex]
mass CaCO₃(MW=100 g/mol) :
[tex]\tt mass=mol\times MW\\\\mass=4.41\times 100\\\\mass=441~g[/tex]
jagsir saw his mother adding dried neem leaves to the metal vessel filled with wheat. jagsir asked the reason for this from his mother. what would be his mothers reply?
Answer:
Because i want to. would be the reply
Explanation:
VOTE ME BRAINLIEST PLSSSSSSSSS
Answer:
none of the above
option d
How many moles are in 2.3 x10^25 atoms of phosphorus
Answer:
38.21 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{2.3 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 38.20598...[/tex]
We have the final answer as
38.21 molesHope this helps you
what is a molecule? PLEASE DONT LOOK THIS UP I WILL GET IN TROUBLE!
Answer:
A molecule is a group of two or more atoms that form the smallest recognizable unit into which the structure and chemical properties of that substance can be divided and preserved by a pure substance.
Explanation:
Determine the oxidation number of sulfur in S203 ( with steps)
Answer:
The oxidation number of sulphur in is +2
Explanation:
S2O3 2-
2 (S) + 3(O)=-2
2 (S) + 3(-2)=-2
2 (S) + (-6) =-2
2 S = +4
S= +2
The EPA tracks the amount of DDT that has entered into our water systems to ensure water safety. Calculate the ppm for a solution made by putting 2.7 g of DDT into a 59000 g of water. Assume masses are additive
a. 46 ppm
b. 0.0046 ppm
c. 4.6 ppm
d. 4.6 x 10^-5 ppm
Pls help if you can
(It’s actually science i just couldn’t find it)
Answer:
Here you go!!
Explanation:
What is the velocity of a plane that traveled 2,800 miles from New York to California in 5.0 hours?
Answer:
560 mph East
Explanation:
Velocity is just speed with direction pretty much.
describe the effect of subjecting hydrogen to pressure
Answer:
When hydrogen is subjected to large enough pressure, it solidifies according to theory.
Explanation:
According to theory, when hydrogen molecules are subjected to enormous degree of pressure the molecules will solidify.
What happens here is that the hydrogen–hydrogen bonds in the hydrogen molecule will break apart and the molecules collapses into hydrogen atoms.
Hence, when hydrogen is subjected to large enough pressure, it solidifies according to theory.
whats the answer giving brainliest please help
Answer:
C (I think)
Explanation:
the levels are higher than they have ever been
Ammonia will decompose into nitrogen and hydrogen at high temperature. Calculate the pressure equilibrium constant for the decomposition of ammonia at the final temperature of the mixture
Answer:
Kp = P (N₂) . P³ (H₂) / P² (NH₃)
Explanation:
The reaction for the decomposition of ammonia is given by;
2NH₃ (g) ⇌ N₂ (g) + 3H₂ (g)
The pressure equilibrium constant gives the ratio of the pressure of the product over reactants for a reaction that is at equilibrium.
The pressures of the species are raised to the powers of their respective coefficients.
In this reaction;
Products = N₂ (g) + 3H₂ (g)
Reactant = 2 NH₃ (g)
The pressure equilibrium constant (Kp) is given as;
Kp = P (N₂) . P³ (H₂) / P² (NH₃)
Which properties are examples of chemical properties? Check all that apply.
reactivity
color
hardness
boiling point
combustibility
shape
Answer:
1.Reactivity
2.combustibility
3.Shape
Hope this helps,
If you think I am right please give brainliest
Happy Holidays!
Explanation:
When 2.00 g of silver nitrate and 2.50 g of sodium sulfide in different solutions combine to react, 1.25 g of precipitate are collected. * The text box will not allow you to use subscript. If you want to type the chemical formula for iron(III) sulfate, Fe2(SO4)3, it will need to be typed as Fe2(SO4)3. Remember that the symbol for iron, Fe, is not "fe" or "FE." Do not include the state of matter for each formula. • What is the chemical formula* for the product? Remember that spectator ions do not form a product in solutions. • What is the theoretical yield, in gram(s) for the solid product? • What is the chemical formula for the limiting reagent? • What is the chemical formula for the excess reagent? • What is the percent yield for the reaction? • How many gram(s) of the excess reagent is/are left over?
Answer:
See Explanation ...
Explanation:
2AgNO₃(aq) + Na₂S(aq) => 2NaNO₃(aq) + Ag₂S(s)
given 2.0g 2.5g Spec Ions Driving Force ppt
= 2.0g/169.8g·mol⁻¹ =2.5g/78g·mol⁻¹
= 0.012mol =0.032mol
0.012/2=>0.006* 0.032/1=>0.032*
Limiting Reactant => *Dividing moles by respective coefficient => Limiting Reactant is the smaller resulting value. Therefore AgNO₃ is the Limiting Reagent
Theoretical Yield of ppt Ag₂S(s) = 1/2(0.012 mol) = 0.006 mol Ag₂S(s) = 0.006mol(246g·mol⁻¹ ) = 1.48g Ag₂S(s)
%Yield = (Lab Yield/Theoretical Yield) x 100% = (1.25g/1.48g)100% = 84%
Reagent in Excess => Na₂S(aq) => 0.032mol is given but only 0.016mol is consumed in the reaction. That is, (0.032 - 0.016)mol = 0.016mol Na₂S(aq) remains in excess = (0.016mol)(78g·mol⁻¹) = 1.25g Na₂S(aq) in excess.
What is the mass of 0.2 mole of oxygen atoms.
Please answer step by step.
[tex]\huge\boxed{3.2 Grams}[/tex]
_____________________________________Moles:Moles is the unit which measures the amount of substance in the System International (SI). A mole is the amount of substance that contains the same amount of substance as the amount of substance exactly in exactly 12 g of carbon-12. C-12 is the standard to measure moles.
I have attached the Equations for moles.
_____________________________________For this question we will use the formula,
[tex]Moles = \frac{Given Mass}{Atomic Mass}[/tex]
Rearrange the equation,
[tex]Mass = (Moles)x(Atomic Mass)[/tex]
Given:
Moles = 0.2
Molecular Mass of Oxygen Atom(Not molecule) = 16
Thus,
[tex]Mass = (0.2)x(16)\\\\Mass = 3.2 grams[/tex]
The mass of 0.2 moles of oxygen atom is 3.2 grams.
_____________________________________Best Regards,'Borz'