Answer:
Exothermic reactions release heat and light into their surroundings. For example, combustion reactions are usually exothermic. In exothermic reactions, the products have less enthalpy than the reactants, and as a result, an exothermic reaction is said to have a negative enthalpy of reaction.
Answer:
Is it fire onn a bottle?
Explanation:
Because I thought that if you shine light ona ANYTHING plastic, the chemical reaction is a little fire.
Aside from invasives like the crown-of-thorns starfish, what other factor is killing the Great Barrier Reef?
O increased temperatures
O overactive algae
O reactive forms of oxygen
O coral bleaching
Answer:
increased temperatures
Explanation:
The temperatures are increasing in the ocean because of ocean warming, by climate change. The heat in the ocean stresses healthy corals, which drains them of their vibrant colors, known as bleaching.
Given that blood exerts the same osmotic pressure as a 0.15 M NaCl solution, which solution could be the hypertonic solution?/search?
a. 0.68 M NaCl solution
b. 0.15 M NaCl solution
c. 0.008 M NaCl solution
Answer:
a. 0.68 M NaCl solution
Explanation:
The tonicity of a solution can either be hypotonic, hypertonic and isotonic. Hypertonic solution is a solution which possesses a higher concentration of solute in relation to another solution.
According to this question, a solution is said to contain 0.15 M NaCl solute. This means that a solution that will be hypertonic to this solution will have a much more concentration of solute, which based on the options provided is the 0.68 M NaCl solution.
Write the formulas for the reactants and products. Balance the chemical equation.
Combination/Synthesis Reaction:
Sodium + Oxygen —>
Explanation:
2Na+O2=2N2Ois balanced one
P4 +502 — P4010
What is the limiting reactant if you are using 25.0 grams of phosphorus and 50.0 grams of oxygen?
A.) O2
B.) P4
C.) P4O10
D.) P4O2
Answer:
B.) P4
Explanation:
Step 1: Convert 25.0 grams of phosphorus into moles of phosphorous:
25 g P4 x 1 mol P4/123.90 g P4 = 0.202 mol P4
Step 2: Convert 0.202 mol P4 into moles of O2 using their stoichiometric ratios:
0.202 mol P4 x 5 mol O2/1 mol P4 = 1.01 mol O2
Step 3: Convert 1.01 mol O2 into grams of O2:
1.01 mol O2 x 31.98 g O2/1 mol O2 = 32.3 g O2
Because 25.0 grams of phosphorous only needs 32.3 grams of oxygen to react, phosphorous will be the limiting reactant, as after the 25.0 grams of phosphorous is used up, there will still be 17.7 grams of oxygen leftover (excess reactant).
Because the reaction cannot occur without more phosphorous to react with the 17.7 grams of oxygen remaining, P4 is the limiting reactant.
Answer: B.) P4
Explanation:
Step 1: Convert 25.0 grams of phosphorus into moles of phosphorous:25 g P4 x 1 mol P4/123.90 g P4 = 0.202 mol P4
Step 2: Convert 0.202 mol P4 into moles of O2 using their stoichiometric ratios:0.202 mol P4 x 5 mol O2/1 mol P4 = 1.01 mol O2
Step 3: Convert 1.01 mol O2 into grams of O2:1.01 mol O2 x 31.98 g O2/1 mol O2 = 32.3 g O2
Because 25.0 grams of phosphorous only needs 32.3 grams of oxygen to react, phosphorous will be the limiting reactant, as after the 25.0 grams of phosphorous is used up, there will still be 17.7 grams of oxygen leftover (excess reactant).
Because the reaction cannot occur without more phosphorous to react with the 17.7 grams of oxygen remaining, P4 is the limiting reactant.
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How much of NaCl is in 1.14 L of 0.400 M
NaCl?
Answer:
44 g NaCI
Explanation:
The problem provides you with the molarity and volume of the target solution, so your first step here will be to use this information to figure out how many moles of sodium chloride.
A balloon full of air has a volume of 1.00L at a temperature of 23 °C. What is the balloon's volume at 33°C?
Answer:1.03L
How do I solve this?
Answer:
V2= 1.03L
Explanation:
Start off with what you are given.
V^1: 1.00L
T^1: 23°C
V^2?
T^2: 33°C
If you know your gas laws, you have to utilise a certain gas law called Charles' Law:
V^1/T^1 = V^2/T^2
Remember to convert Celsius values to Kelvin whenever you are dealing with gas problems. This can be done by adding 273 to whatever value in Celsius you have.
(23+273 = 296) (33+273 = 306)
Multiply crisscross
1.00/296= V^2/306
296V^2 = 306
Dividing both sides by 296 to isolate V2, we get
306/296 = 1.0337837837837837837837837837838
V2= 1.03L
A car travelling
at 35 m/s has a
kinetic energy
of 500,000 J.
what is the
mass?
I NEED HELP FIGURING THIS OUT
Answer:
816.33 kg
Explanation:
To solve this problem we'll need to keep in mind the formula for the kinetic energy of an object:
E = 0.5 * m * v²Where E is the kinetic energy, m is the object's mass and v its velocity.
We input the data given by the problem:
500000 J = 0.5 * m * (35 m/s)²And solve for m:
m = 816.33 kgWhich illustration is a closed circuit? * + A B
Answer:
I believe its B for sure
Hope this helps!
Explanation:
HELP ASAP!!!!!!!!!!
What is sous-vide?
A food stabilizer
B liquid food that chefs make into a spherical shape
C food that chefs quickly freeze using liquid nitrogen
D food that chefs seal in a plastic bag and cook under controlled temperature conditions
Answer:
D) food that a chef seal in a plastic bag and cook under a controlled temperature condition.
Explanation:
Sous vide, also known as low temperature long time cooking, is a method of cooking in which food is placed in a plastic pouch or a glass jar and cooked in a water bath for longer than usual cooking times at a precisely regulated temperature.
Need help fast help help help. Help
Answer:
fjnjfzgnf
Explanation:
Answer:
it blank !
Explanation:
According to the quantum-mechanical model for the hydrogen atom, which electron transition produces light with the longer wavelength: 3p + 2s or 4p + 3p? Match the words in the left column to the appropriate blanks in the sentences on the right. Reset Help increases As the n level increases, the energy and thus the levels are each 3p → 2s other. Therefore, the transition would have a greater energy difference than the transition from inversely decreases Energy and wavelength are proportional, so the transition would farther from produce a longer wavelength. 4p + 3p directly closer to
Answer:
Explanation:
The main task here is that there are some missing gaps in the above question that needs to be filled with the appropriate answers. So, we are just going to do rewrite the answer below as we indicate the missing gaps by underlining them and making them in bold format.
SO; In the quantum-mechanical model of the hydrogen atom.
As the n level increases. the energy increases and thus levels are closer to each other. Therefore, the transition 3p→2s would have a greater energy difference than the transition from 4p→3p.
[tex]Energy \ and \ wavelength \ are \ inversely \ proportional , \ so \ the \ \mathbf{ 4p\to 3p} \ transition \ would[/tex][tex]produce \ a \ longer \ wavelength.[/tex]
PLEASE HELP!!
How many moles are contained in 7.88 x 10^24 atoms of Iron?
Answer:
Explanation:
9.55 mol of Al
Explanation:
To obtain the number of moles of a certain element given the number of atoms only, you have to divide it with Avogadro's number,
Answer: mutiply them
Explanation:
A relationship in which one variable increases as the other variable decreases is an inverse relationship.
CA. True
B. False
Answer:
TRUE
Explanation:
HOPE IT WILL HELP YOU
what is the mass in grams of 0.687 moles of NH three
An aqueous solution of sodium chloride, NaCl has a mol fraction of 0.15. calculat the molality of NaCl
Answer:
8.8mol/l
Explanation:
but I'm not percent sure.
A student determines the molar mass of acetone, CH3COCH3, by the method used in this experiment. She found that the equilibrium temperature of a mixture of ice and water was 1.0 degrees C on her thermometer. When she added 11.1 g of her sample to the mixture, the temperature, after thorough stirring, fell to -3.0 degrees C. She then poured off the solution through a screen into a beaker. The mass of the solution was 90.4 g.a) What was the freezing point depression?b) What was the molality of acetone? I need help especially with this one.c) How much acetone was in the decanted solution?d) How much water is in the decanted solution?e) How much acetone would there be in a solution containing 1 kg of water and acetone at the same concentration as she had in her experiment?f) What did she find to be the molar mass of acetone, assuming she made the calculation properly?
Answer:
(a). 4°C, (b). 2.4M, (c). 11.1 g, (d). 89.01 g, (e). 139.2 g and (f). 58 g/mol.
Explanation:
Without mincing words let's dive straight into the solution to the question.
(a). The freezing point depression can be Determine by subtracting the value of the initial temperature from the final temperature. Therefore;
The freezing point depression = [ 1 - (-3)]° C = 4°C.
(b). The molality can be Determine by using the formula below;
Molality = the number of moles found in the solute/ solvent's weight(kg).
Molality = ( 11.1 / 58) × (1000)/ ( 90.4 - 11.1) = 2.4 M.
(c). The mass of acetone that was in the decanted solution = 11.1 g.
(d). The mass of water that was in the decanted solution = 89.01 g.
(e). 2.4 = x/ 58 × (1000/1000).
x = 2.4 × 58 = 139.2 g.
(f). The molar mass of acetone = (12) + (1 × 3) + 12 + 16 + 12 + (1 x 3) = 58 g/mol.
An antacid tablet with an active ingredient of CaCO3 was dissolved in 50.0 mL of 0.300 M HCl. When this solution was titrated with 0.300 M sodium hydroxide, 32.47 mL was required to reach the end point. Determine the mass (in grams) of calcium carbonate in the tablet. Molar Mass of CaCO3
Answer:
Explanation:
mole of HCl remaining after reaction with CaCO₃
= .3 M of NaOH of 32.47 mL
= .3 x .03247 moles
= .009741 moles
Initial HCl taken = .3 x .005 moles = .0015 moles
Moles of HCl reacted with CaCO₃
= .009741 - .0015 = .008241 moles
CaCO₃ + 2HCl = CaCl₂ + CO₂ + H₂O .
1 mole 2 moles
2 moles of HCl reacts with 1 mole of CaCO₃
.008241 moles of HCl reacts with .5 x .008241 moles of CaCO₃
CaCO₃ reacted with HCl = .5 x .008241 = .00412 moles
the mass (in grams) of calcium carbonate in the tablet
= .00412 x 100 = .412 grams . ( molar mass of calcium carbonate = 100 )
We have that the mass (in grams) of calcium carbonate in the tablet is mathematically given as
mass of CaCO₃= 0.412 grams
The mass (in grams) of calcium carbonate in the tabletQuestion Parameters:
An antacid tablet with an active ingredient of CaCO3 was dissolved in 50.0 mL of 0.300 M HCl. titrated with 0.300 M sodium hydroxide, 32.47 mL was required to reach the end point.Generally the equation for the mole of HCl is mathematically given as
mole of HCl = 0.3 M of NaOH of 32.47 mL
mole of HCl= 0.3 x 0.03247 moles
mole of HCl= 0.009741 moles
Therefore
Initial HCl taken = 0.3 x 0.005 moles
Initial HCl taken= 0.0015 moles
Moles of HCl reacted with CaCO₃
M_{hcl}= 0.009741 - .0015
M_{hcl}= .008241 moles
The Chemical Equation
CaCO₃ + 2HCl = CaCl₂ + CO₂ + H₂O .
Therefore, CaCO₃ reacted with HCl is
CaCO₃ reacted with HCl= 0.5 x 0.008241
CaCO₃ reacted with HCl= .00412 moles
Hence,the mass of CaCO₃ is
mass of CaCO₃ = 0.00412 x 100
mass of CaCO₃= 0.412 grams
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what organelle acts as a barrier of the cell?
Answer:
cell membrane
Explanation:
it controls what comes and goes out of a cell
Answer:
Cell membrane
Explanation:
It separates the interior of all cells from the outside environment (the extracellular space) which protects the cell from its environment.
Please help 3. The combustion of glucose is represented by the following balanced equation: C6H12O6 + 602 - 6H20 + 6CO2.
Which reactant is the limiting reagent if there is 1 gram of both C6H12O6 and O2? (Hint: Must convert to moles to determine this.)
O a C.H 20
O bO2
O c H₂O
Od CO₂
Answer:
Explanation:
C₆H₁₂O₆ + 60₂ = 6H₂0 + 6CO₂.
1 mole 6 mole
molecular weight of C₆H₁₂O₆ = 180 g
molecular weight of oxygen = 32 g
1 gram of glucose = 1 / 180 = 5.55 x 10⁻³ moles
1 gram of oxygen = 1 / 32 = 31.25 x 10⁻³ moles
1 mole of glucose reacts with 6 moles of oxygen
5.55 x 10⁻³ moles of glucose will react with 6 x 5.55 x 10⁻³ moles of oxygen
= 33.30 x 10⁻³ moles of oxygen .
But oxygen available = 31.25 x 10⁻³ moles
So available oxygen is less than required .
Hence oxygen is the limiting reagent .
b ) is the right option .
Question 4 (4 points)
(01.03 MC)
An energy transformation flow diagram is shown.
X-
ELECTRICAL
ENERGY
What type of energy does X most likely represent? (4 points)
O a
X = gravitational energy
Oь
X = mechanical energy
Ос
= thermal energy
Od
X = radiant energy
Answer:
I think radiant I’m not sure
Explanation:
What is the primary function of the chromosome?
Answer:
Store the genetic instructions needed to specify traits.
In DNA, the primary function of chromosome is store the genetic instructions needed to specify traits.
What is DNA?
DNA is a hereditary material which is present in human beings as well as all other living organisms. Every cell which is present in an organism's body has DNA which is the same. Most of the DNA is situated in the cell's nucleus and small amount of it can be found in the cell's mitochondria as well.
Information which is stored in DNA is stored as codes made up of four chemical bases namely, adenine, thymine , cytosine and guanine.Human DNA consists of 3 billion bases .The order of the bases determines information which is required for building and maintaining an organism.
DNA bases are capable of pairing up with each other. Adenine pairs with thymine and guanine pairs up with cytosine .Each base is also attached to a sugar molecule and a phosphate group. A base, phosphate sugar are together called as nucleotides.
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Are the gas laws affected depending on whether you use heavy gas particles or light gas particles? If anything, what is affected by the size of the molecule?
Answer:
yes
Explanation:
Yes, size of molecule has greatly affected the gas law.
The gas laws affected depending on whether we use heavy gas particles or light gas particles because the heavy gas particles can't move faster as light gas particles with the increase of temperature.
If the temperature is increased, the gas particles move faster due to absorb of heat energy so they hit the walls of the container. This causes the pressure to rise. The pressure of a gas also increases when the volume of container in which it is placed is decreased. Bigger the molecule size, the stronger the intermolecular forces, so the molecule has higher melting and boiling points so we can conclude that big size molecule greatly affected the gas law.
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Explain why anhydrous aluminium chloride is fairly soluble in organic solvent while anhydrous magnesium chloride is insoluble
Answer:
The correct answer is - anhydrous aluminum chloride is covalent whereas anhydrous magnesium chloride is ionic.
Explanation:
Anhydrous aluminum chloride is a covalent compound and we know that covalent compounds have less or no polarity. Organic compounds or solvents are mostly non-polar in nature. And it is a thumb rule that like-dissolves-like.
Thus they dissolve covalent molecules like anhydrous aluminum chloride.
Anhydrous magnesium chloride is an ionic compound that tends to interact with a polar solvent but not in a non-polar solvent such as organic solvents.
Anhydrous aluminum chloride is fairly soluble in the organic solvent while anhydrous magnesium chloride is insoluble because anhydrous aluminum chloride is covalent whereas anhydrous magnesium chloride is ionic.
Why is AlCl3 soluble in organic solvent?AlCl3 quite simply accepts electrons from other atoms, in an try and get a full valence shell of eight electrons. It's why it normally behaves as a Lewis acid. In the response under, the Al atom accepts a lone pair of electrons from a Cl atom.
Why is AlCl3 soluble in water?AlCl3 is hygroscopic and has a great affinity for water. Therefore, aluminum chloride dissolves in water partially.
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molecular formula of CH3-CH2-CH2-CH2-CH2-Cl
Answer:
C₅H₁₁Cl
Explanation:
Count all the carbon, hydrogen, and chlorine atoms. The number of atoms of each element is the subscript for each element in the formula. No subscript is understood to be one. Carbon goes first, hydrogen goes second, and chlorine goes last when writing the formula.
what is the expirement
Answer:
A Experiment is an operation or procedure carried out under controlled conditions in order to discover an unknown effect or law, to test or establish a hypothesis, or to illustrate a known law
Explanation:
Brainliest pls
When a soda is poured into a glass and the soda bubbles, is it the result of a chemical change? Explain your answer.
An element X has a triiodide with the empirical formula XI3 and a trichloride with the empirical formula XCl3. The triiodide is converted to the trichloride according to the equation XI3 Cl2XCl3 I2 If the complete conversion of 1.196 g of XI3 results in the formation of 0.436 g of XCl3, what is the atomic mass of the element X
Answer:
51.03g/mol is the molar mass of X
Explanation:
Based on the reaction:
2XI₃ + 3Cl₂X → 2XCl₃ + 3I₂
Where 2 moles of XI₃ reacts to produce 2 moles of XCl₃ -The ratio of reaction is 1:1-
To solve this question we must find the mass of X per mole (This is the atomic mass of X).
As the moles of both compounds are the same:
1.196g / 0.436g = Molar mass XI₃ / molar mass XCl₃ (1)
Also:
Molar mass XI₃ = Molar mass X + 380.71g/mol
Molar mass XCl₃ = Molar mass X + 106.36g/mol
Replacing in (1):
2.7431 = (Molar mass X + 380.71g/mol) / (Molar mass X + 106.36g/mol)
2.7431 Molar mass X + 291.76g/mol = Molar mass X + 380.71g/mol
1.7431 Molar mass X = 88.95g/mol
Molar mass X = 51.03g/mol
51.03g/mol is the molar mass of XWhat is full ground state electron configuration of C-?
Answer:
[tex]1s^{2}[/tex] [tex]2s^{2}[/tex] [tex]2p^{2}[/tex]
Explanation:
Simply [tex]1s^{2}[/tex] [tex]2s^{2}[/tex] [tex]2p^{2}[/tex]
Coal has two valent electrons, so there is 2 in 2p orbital
Which of the following are more likely to form a solution? (select all that apply)
A) When both solute and solvent are polar
B) When both solute and solvent are nonpolar
C) When solute is polar and solvent is nonpolar
D) When solute is nonpolar and solvent is polar
Answer:A and B
Explanation:
A substance is said to be polar when it is having a dipole (a delocalised positive and negative charge) or it is ionic (dissociate into ions when dissolved in water)
Can someone help me please
Answer:
the answers are a, f, g
and lastly e because they all describe a liquid