Answers
Answer:
absorb
Explanation:
Endothermic reactions absorb energy ....usually feel cold
Related Questions
Which electrode gets heavier in an electrolytic cell?
OA. The electrode where reduction occurs
OB. The electrode that is donating electrons
C. The electrode with the higher reductive potential
OD. The electrode that is being oxidized
Answers
Answer:
The answer is the cathode. This electrode would get heavier in an electrolyte cell. This electrode would have the conventional current leaving then a polarize electrical device. A conventional current would be the one describing the direction where the electronic charges move.
Explanation:
aka... The electrode where reduction occurs.
Answer:
a. the electrode where reduction occurs
Explanation:
In calculating a percent yield, you need a theoretical yield. Where does the theoretical yield come from?
Answers
Answer: Calculated results
Explanation:
What is specific heat capacity?
Answers
Answer:
The energy needed to change the temp of a substance
Explanation:
Name the compound
i: (CH3)2CHCOOH
Answers
Answer:
methylpropanoic is your answer
A sample of methane occupies 3. 0 L at 200. C and 1. 4 ATM. What is the volume of the gas at STP?
Answers
Answer:
2.42 liters
Explanation:
P1V1/T1 = P2V2/T2 T 'S are in K
STP is 273.15 K and 1 atm
1.4(3) / 473.15 = (1) ( V) /273.15
V = 2.42 liters
Which part of experimental design is most important to a scientist when replicating an experiment?.
Answers
Answer:
A split-plot design lets us replicate our treatments twice using only 24 runs in a single time period, hence it is the most efficient use of resource.
Explanation:
hope this helps
What is the most significant intermolecular force between water molecules?.
Answers
Answer:
cohesive force
Explanation:
Which of the molecules below is propyne? two carbons are double bonded to each other; the pair is single bonded to h above left, below left, and below right, and to c h 3 above right. two carbons are double bonded to each other; the pair is single bonded to c h 3 above left and right, and to h below left and right. an h is single bonded to c, which is triple bonded to another c, which in turn is single bonded to a c with h above and below and yet another c to the right; the final c is bonded to h above, below, and right. an h is single bonded to c, which is triple bonded to another c, which in turn is single bonded to a c which is bonded to h above, below, and right.
Answers
Propyne is is composed of only hydrogen and carbon. It is a hydrocarbon molecule.
What is propyneThe molecule propyne is hydrocarbon. This means that it is composed of only hydrogen and carbon. The molecule contains three carbon atoms and four hydrogen atoms as shown.
The structral formula that corretly reperesents the molecule called propyne is shown in the image attaced to this answer.
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Answer:
C.
Explanation:
if the theoretical yield is 27.71 g and the actual yield is 20.02 g what is the yield?
Answers
0.7341*100=73.41%
Hypothesis for candy bar density lab
Need answer ASAP!!!!!
Answers
In a chemical reaction, when particle size is reduced, the rate of reaction increases because of increased surface area of the
reactants.
Why would increased surface area increase reaction rate?
-0)
A)
It increases the number of collisions among particles.
B)
It decreases the activation energy.
It increases the concentration.
D)
It decreases the temperature.
Answers
Answer:
option A
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An increased surface area would increase the reaction rate because it increases the number of collisions among particles.
What is rate of a reaction?Rate of a reaction is the speed or length of time it takes for a reaction to take place.
The rate of a chemical reaction can be affected by the following:
Increase in surface area of reactantsIncrease in temperatureAccording to this question, when particle size is reduced, the rate of reaction increases because of increased surface area of the reactants.
This is because the increase in surface area increases the number of collisions among particle.
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Which statement best describes how light and lenses work together?
Do someone no the answer
Answers
Answer:
Answer A
Explanation:
When light enters a lense it bends and changes direction, and then does this again when it leaves. leaving the correct image in the center
What is a large area of air with the same temperature?.
Answers
Sorry this is late but it would be the air mass
Hope this halpes :))
Two atoms interact with each other and change as shown by the equation Complete the equation by filling in the missing parts.
Answers
Answer: the missing parts are ³₂He
Explanation:
The equation shown represents a nuclear reaction, meaning that, instead of the two hydrogen atoms form a molecule by a chemcial bond between the electrons of the atoms, the nuclei of the two interacting atoms change, leading to a new kind of atoms and particles.
That is mainly indicated by the appearace of the particle ¹₀ n, which is the symbol for a neutron. The superscript 1 to the left of the symbol (letter n) means that the mass number of the neutron is 1, and the subscript 0 to the left of the symbol means that the atomic number of neutron is 0.
To determine the symbol, superscript and subscript needed to complete the missing parts of the equation, you need to do a mass number and atomic number balance.
Mass number balance:
The mass number is the superscript to the left of the symbol of the atom.
Each hydrgogen atom, in the reactant side, contributes a mass number 2, and the neutron on the product side contributes a mass number 1, so the balance is:
2 + 2 = x + 1,
from which you determine that the unknown mass number is x = 4 - 1 = 3.
Atomic number balance
The atomic number is the subscript to the left of the element.
Each hdyrogen atom contributes an atomic number 1, and the neutron contributes 0 atomic number. So, the atomic number balance is:
1 + 1 = x + 0 ⇒ x = 2.
Hence, the unknown atomic number is 2.
Conclusions:
The atomic number of the unknown element is 2, meaning that it has 2 protons.
In a periodic table you find that the element with atomic number 2 is helium, whose symbol is He.
The mass number of this atom of helium is 3, which implies that it has 3 - 2 = 1 neutron.
Using the corresponding notation, the complete equation is:
²₁ H + ²₁ H → ³₂He + ¹₀ p
hope this helps
What is the molarity of HCl found in a titration where 30 mL of HCl is titrated with 15 mL of 0.1 M NaOH
Answers
The molarity of HCl is found in a titration where 30 mL of HCl is titrated with 15 mL of 0.1 M NaOH is 0.05 M.
What is molarity?Molarity is the measure of the concentration of any solute per unit volume of the solution.
The reaction is [tex]\rm NaOH(aq)+HCl(aq) \rightarrow H2O(l)+NaCl(aq)[/tex]
The ratio is 1:1
Step1- to calculate the equal moles of HCl
[tex]\dfrac{0.1\;mol\;NaOH}{ L} \times 15\;ml = 1.5\; mmol[/tex]
Step2: Calculate the molar concentration
[tex]\dfrac{1.5 \; m mols\;HCl}{ 30\;ml\;HCl} = 0.05 \;M \;HCl[/tex]
Thus, the molarity of HCl is 0.05 M.
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An aqueous solution has a hydroxide ion concentration of 1.20 × 10–2 M at 25°C. Calculate the pOH of the solution.
Answers
Let's see
25°C is normal room temperature denotionpOH
[tex]\\ \rm\Rrightarrow -log[OH^-][/tex]
[tex]\\ \rm\Rrightarrow -log[1.2\times 10^{-2}][/tex]
log(ab)=loga+logb[tex]\\ \rm\Rrightarrow -log1.2-log10^{-2}[/tex]
[tex]\\ \rm\Rrightarrow -0.0791812460476+2[/tex]
[tex]\\ \rm\Rrightarrow 2.0791812460476[/tex]
Approximately 2A solid substance turns directly into a gas. Which term describes this change?
deposition
evaporation
melting
sublimation
Answers
Answer:
sublimation
Explanation:
Deposition is like dew forming
evaporation is going from liquid to gas
melting is going form solid to liquid ( like ice does when it warms)
sublimation is going from solid directly to gas ( like moth balls)
The combustion of propane (C3H8) produces CO₂ and H₂O:
C₂H8 (g) +5O₂ (g) → CO₂ (g) + 4H₂O(g)
The reaction of 5.5 mol of O₂ will produce ____ mol of H2O
Answers
Answer:
4.4 moles of water
Explanation:
Propane is C3H8. Is the chemical equation, you wrote C2H8 which is wrong. Type everything properly and give a check before finally posting the question.
The chemical equation that is given, is not properly balanced. The BALANCED equation would be
C3H8 + 5O2 → 3CO2 + 4H2O
From this balanced chemical equation, we see that 5 moles of oxygen produce 4 moles of water.
5 moles of Oxygen → 4 moles of water
1mole of oxygen → [tex]\frac{4}{5}[/tex] moles of water
5.5 moles of oxygen → ([tex]\frac{4}{5}[/tex] × 5.5) moles of water = 4.4 moles of water
∴ The reaction of 5.5 mol of O2 will produce 4.4 mol of H2O. [Answer:]
Answer:
5.5
Explanation:
First, you will need to balance the equation ( the equation in your question is not balanced....typo?)
C2 H8 + 4 O2 ===> 2 CO2 + 4 H2O
Now, from the balanced equation:
O2 : H2O = 4/4 = 1/1
SO 5.5 MOLES OF O2 PRODUCES 5.5 MOLES H20
An increase in blood carbon dioxide content causes hemoglobin to ________. release all bound carbon dioxide molecules bind more oxygen molecules bind more H release more oxygen molecules denature
Answers
An increase in blood carbon dioxide content causes hemoglobin to release more oxygen molecules. Details about hemoglobin can be found below.
What is hemoglobin?Hemoglobin is the iron-containing substance in red blood cells that transports oxygen from the lungs to the rest of the body.
Hemoglobin consists of a protein (globulin) and heme (a porphyrin ring with an atom of iron at its centre). This justifies its oxygen affinity.
However, excess carbon dioxide in the blood causes blood pH to decrease, resulting in hemoglobin proteins releasing more oxygen molecules.
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Which is not a property of bases Group of answer choices react with metals to produce hydrogen gas react with acids to form a salt and water bitter taste slippery feel
Answers
Answer:
react with metals to produce hydrogen gas
Explanation:
NaOH is a common base and is a strong base. Look what happens with it reacts with a metal:
OH- (aq) + Li(s) --> LiOH. It forms a salt not H2
(I removed spectator ions)
Question 3 (1 point)
Electrochemical processes involve redox reactions because electrons are transferred.
O True
O False
Question 4 (1 point)
The activity series of metals helps determine the result of chemical reactions.
O True
O False
Answers
An electrochemical process involves any process that has to do with the transfer of elecrons.
What is an elecrochemical process?An electrochemical process involves any process that has to do with the transfer of elecrons. These process include redo reactionand electron transport chains.
It is a true statement that the actiivity series helps to detect the products in a reaction because a metal that is lower in the series is always displaced by a metal that is higher in the series.
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Ba(C204) + K(IO3) = Ba(IO3)2 + K2(C2O4)
Answers
Explanation:Reaction Type
Double Displacement (Metathesis)
Net Ionic Equation
Ba(C2O4) + 2K(IO3) = Ba(IO3)2 + K2(C2O4) might be an ionic equation. Calculate the net ionic equation for Ba(C2O4)(s) + 2K(IO3)(aq) = Ba(IO3)2(aq) + K2(C2O4)(aq).
A nearly complete skeleton, ____ is a classic example of a Neanderthal with many defining Neanderthal characteristics. Group of answer choices Taung Child La Ferrassie 1 Piltdown Man KNM-ER 1805
Answers
Answer: La Ferrassie 1
Explanation: La Ferrassie 1, often referred to as LF1, is a male Neanderthal skeleton estimated to be 70–50,000 years old. It was discovered at the La Ferrassie site in France by Louis Capitan and Denis Peyrony in 1909. The skull is the most complete Neanderthal skull ever found.
Divers get "the bends" if they come up too fast because the gas in their blood expands, forming bubbles in their blood. If a diver has 5.0 mL of gas in his blood under a pressure of 250. atm then rises instantaneously to a depth where his blood has a pressure of 50.0 atm, what will the volume of gas in his blood be?
Answers
Solve without converting volume into dm³ as it will led into same answer
According to Boyles law
P1V1=P2V25(250)=50V21250=50V_2V_2=25mLAccording to Boyle's law, the volume of gas in his blood will be 25 ml at constant temperature.
What is Boyle's law?
Boyle's law is an experimental gas law which describes how the pressure of the gas decreases as the volume increases. It's statement can be stated as, the absolute pressure which is exerted by a given mass of an ideal gas is inversely proportional to its volume provided temperature and amount of gas remains unchanged.
Mathematically, it can be stated as,
P∝1/V or PV=K. The equation states that the product of of pressure and volume is constant for a given mass of gas and the equation holds true as long as temperature is maintained constant.
According to the equation the unknown pressure and volume of any one gas can be determined if two gases are to be considered.That is,
P₁V₁=P₂V₂
substitution gives V₂=250×5/50=25 ml.
Therefore, the volume of gas in his blood will be 25 ml at constant temperature.
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What's the name of this molecule?
Answers
Answer:
option d
Explanation:
Which animal feels no pain when they are exposed to acid?.
Answers
Researchers have found out why the African nak.ed mole-rat, one of the world's most unusual mammals, feels no pain when exposed to acid. The animals have an altered ion channel in their pain receptors that is inactivated by acid and makes the animals insensitive to this type of pain.
hope it helps...!!!
Order the following pH values from most acidic to least acidic (most basic).
5.7
7.0
1.2
9.1
Answers
Answer: 1.2 to 5.7 to 7.0 to 9.1
Explanation: Highest acidic begins with 1
10 grams CH10 + excess O2 → ? grams CO2 + H2O
Answers
Answer:
20 gm CO2
Explanation:
CH10 mole weight = ~ 22 gm
each 22 gm CH10 produces 44 gm CO2
44 / 22 = x / 10 = 20 gm
How long are peeled potatoes good for in the fridge?.
Answers
Answer:
24 hours
Explanation:
You can safely leave peeled potatoes in the refrigerator for 24 hours. It's a great way to get a head start on your holiday meal preparation. As the Idaho Potato Commission notes, you can keep both whole, peeled potatoes or cut potatoes in the refrigerator.
A balloon is filled with 100.0 Lair at 1.300 atm pressure. what pressure is needed to change the volume to 25.00 L
Answers
Answer:
4 atmospheric pressure is needed to get a volume of 25 litres