Answer:
Just like with any other reaction, balancing the equation for the reaction is important so that people can know all the inputs and outputs, and know how much of each input (reactant) is needed to produce a certain amount of product.
If your sweat glands suddenly got clogged or blocked, what function of the Integumentary system might not work anymore?
A.
Vitamin D production
B.
Protection of the body
C.
Regulating body temperature
D.
Gathering information from the environment
C. Regulation body temperature
3. What does the double-ended arrow indicate in
the following chemical equation?
CaCO3 = Ca2+ + CO32-
Answer:
⇌ means that the equation is reversible, The reactants can become products and vice versa
Explanation:
Answer:
See below ~
Explanation:
The reaction :
CaCO₃ ⇄ Ca²⁺ + CO₃²⁻The double sided arrow represents that this is a reversible reaction.
Just as calcium carbonate can dissociate into calcium ion and carbonate ion, it can form calcium carbonate when calcium ion and carbonate ion are bonded together ionically.
NEED HELP ASAP
Consider the following equation:
Cu+2AgNO3=Cu(NO3)2+Ag
If 0.286 mol of Cu(NO3)2 were produced, how many mol of Cu reacted?
Answer:
5.6 moles of AgNO3 is required to produce 2.8 moles of Cu(NO3)2Explanation:Cu + 2AgNO3 Cu(NO3)2 + 2AgBefore solving this one must make sure the equation is balanced. From the balance equation you could notice that the AgNo3(silver nitrate) has 2 moles while the Cu(NO3)2 has 1 mole. If 2 moles = 1 mole ? = 2.8 molescross multiply 2.8 x 2 = 5.6 moles
Explanation:
What kind of system is the coffee cup calorimeter considered, and what does that mean in terms of energy transfer?.
Answer:
A coffee cup calorimeter is a constant-pressure calorimeter.
Explanation:
As such, the heat that is measured in such a device is equivalent to the change in enthalpy.
Derek needs a tool that delivers 5.00 ml of a sodium hydroxide solution. which tool would be best for him to use? a beaker a pipette a graduated cylinder an erlenmeyer flask
Because 5.00 mL is a small amount, the best tool he could use is a pipette.
What is a pipette?Pipette or sometimes spelled as pipet can be used to transport liquid samples. It is made out of glass or plastic and can is usually used to transfer measured volumes of liquid from one container to another.
Before the pipette was invented, scientists used to use straws and they would suck in the samples carefully.
Hence 5.00 mL is a small amount, the best tool he could use is a pipette.
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If two reactant particles collide, but bounce away unaffected, this is called a(n).
a)ineffective collision
b)effective collision
C)nonspecific collision
d)rearrangement of atoms
If two reactant particles collide, but bounce away unaffected, this is called an ineffective collision.
The Collision theoryAccording to the collsion theory, the reaction between particles occur as a result of the collsion of particles that have energy that is in excess of the activation energy.
Now if two particles, do not posses the activation energy, they collide and rebound from each other. This is called an ineffective collision.
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Particle theory states that particles are attracted to each other??
True or false
Answer:
true
Explanation:
Students often have no experience with the idea that some things (particles) can’t be divided. If sand is ground up into tiny pieces it is still sand. There seems no reason why the dividing can’t keep on going to smaller and smaller pieces. This is often described as a continuous view of matter.
Even when children are introduced to the idea of matter being made of particles, most consider there is still ‘stuff’ between the particles and that something like air fills the empty space. After all, when liquid is poured from a glass so that it is empty it still contains air.
These ideas are further explored in ‘Hannah’s Question,’ a classroom practice vignette.
Research: Loughran, Berry, Mulhall & Gunstone (2001), Novick & Nussbaum (1981)
Particles are often assumed to behave in the same way as the substances they make up. For example students can believe that particles themselves can swell, shrink and melt or that the particles in stone are harder than the particles in rubber. Many students consider that ice molecules melt to little droplets of water.
Scientific view
The properties of matter can best be explained using a model in which all materials are composed of tiny particles (atoms, molecules and ions).
There is empty space between particles and particles are constantly moving (their speed is changed by temperature). The particles in solids and liquids are quite close to each other, while those in gases are a very long way apart. (There is commonly an increase in volume of at least 1000 fold when substances move from solid or liquid to gas).
Changes of state involving solids, liquids and gases as well as a range of other phenomena can be explained by changes in arrangement and speed of the particles.
Determine the pressure change when a constant volume of gas at 0.850 atm is heated from 20.0C to 30.0C
Answer:
0.425 atm
Explanation:
According to Ideal Gas Equation,
PV = nRTTherefore, P ∝ TP₁T₂ = P₂T₁Given :
P₁ = 0.850 atmT₁ = 20.0 CT₂ = 30.0 CSolving :
0.85 x 30 = P₂ x 2030 x 17/20 = P₂ x 20510 = 400P₂P₂ = 510/400 = 1.275 atmChange in pressure = ΔP = P₂ - P₁ = 1.275 - 0.850 = 0.425 atmDetermine the gram-formula mass of the magnesium sulfate heptahydrate
Answer:
120.366 g/mol
Explanation:
MAGNESIUM SULPHATE HEPTAHYDRATE Magnesium sulfate is an inorganic salt containing magnesium, sulfur and oxygen, with the formula MgSO4. Molar mass: 120.366 g/mol
Answer:
sulfur and oxygen, with the formula MgSO4. Molar mass: 120.366 g/mol
Explanation:
Hi its me a another me lol
The volume of a gas is 204 ml when the pressure is 925 kPa at constant temperature what is the final pressure if the volume increases to 306 ml?
Calculate. 925 x 1.5 is 412.5 + 412.5 + 412.5.
This totals to 1387.5 kPa.
10 g of sodium hydrogen carbonate dissolved in 20 cm cubed water in a boiling tube .Lemon juice was added dropwise with shaking until there was no further change explain observation made in the boiling tube when the reaction was in progress
Answer:
it says the answer bro
look
Explanation:
How many liters of CO2 are produced when 32. 6 liters of propane gas, C3H3 reacts
with excess oxygen gas at STP?
C3Hg + 502 + 4H2O + 3CO2
Answer: Propane is c3h8 and oxygen gas is O2
Explanation: make sure equation is balanced and There are 3 carbons in the reactants, and 3 carbons in the products also There are 8 hydrogens in the reactants and 8 hydrogens in the products even though There are 10 oxygens in the reactants and 10 oxygens in the product its already balanced so therefore you then need to convert the amount of moles of oxygen to the number of moles of propane to get your answer
What is the pH of a solution that has a [OH-] of 5.08x10^-5 M
Answer:
The pH of a solution that has a [OH-] of 5.08x10^-5 M is 5
Explanation:
just took the test
onedg2020
The horizontal rows on the periodic table of elements are known as:.
Answer:
periods
Explanation:
In chemsitry, the horizontal columns are known as periods and the vertical columns are known as groups.
The electrolysis of water forms h2 and o2. 2h2o right arrow. 2h2 o2 what is the percent yield of o2 if 10.2 g of o2 is produced from the decomposition of 17.0 g of h2o? use percent yield equals startfraction actual yield over theoretical yield endfraction times 100.. 15.1% 33.8% 60.1% 67.6%
The percent yield of oxygen if 10.2 g of O₂ is produced from the decomposition of 17.0 g of H₂O is 67.6%.
How do we calculate moles from mass?Moles (n) of any substance can be calculated by using their mass as:
n = W/M, where
W = given mass
M = molar mass
Given chemical reaction is:
2H₂O → 2H₂ + O₂
Moles of 17g H₂O = 17g / 18.02 g/mol = 0.943 moles
From the stoichiometry of the reaction it is clear that,
2 moles of H₂O = produces 1 mole of O₂
0.943 moles of H₂O = produces 1/2×0.943=0.471 mole of O₂
Now mass of this 0.471 moles of O₂ = (0.472mol)(32g/mol) = 15.104 grams
Actual mass of oxygen = 10.2g (given)
Now on putting vales on the percent yield formula, we get
% yield = (10.2 / 15.104)×100% = 67.53% = 67.6%
Hence the required value of percent yield is 67.6%.
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Answer:67.6
Explanation:bc im just that good
A solution is created by measuring 3. 60 x 10-3 moles of NaOH and 5. 95 x 10-4 moles of HCl into a container and then water is added until the final volume is 1. 00 L. What is the pH of this solution? Please answer as quickly as possible
Answer: 11.478
Explanation:
M = MBVB- MAVA/VA + VB
= number of moles of base - number of moles of acid/total volume
= 3.6*10^-3 - 5.95*10^-4/1
= 0.0036-0.000595 = 0.003005
[OH^-] = M = 0.003005M
POH = -log[OH^-]
= -log0.003005
= 2.522
PH = 14 - POH
= 14 - 2.522
= 11.478
Therefore, the pH of the solution is 11.478
What is the name of this hydrocarbon? a chain of 5 carbon atoms, with h above and below each c, and to the left and right of the chain. hexane heptane octane pentane
The name of the hydrocarbon having hydrogen atoms above and below each carbon atom and at the ends of carbon chain is pentane.
What are hydrocarbons?Hydrocarbons are the compounds which are formed by the combination of hydrogen and carbon atoms.
In the question it is mention that in the compound 5 carbon atoms are present and there specifically not mention the bonds so that single bonds are present between all of them. And hydrogen atoms are attached to single carbon atoms to fulfill their valency.
Hence required hydrocarbon is pentane and its structure is attached below.
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Suppose you heat 4.24 g of S8 with 5.00 of Cl2, what would be the theoretical yield of S2Cl2? If the actual yield of S2Cl2 is 6.55g, what is the percent yield
S8 (l) + 4Cl2 (g) ------> 4S2Cl2 (l)
Answer:
Explanation:
Part 1: Theoretical yield
5.00 + 4.24 = 9.24 grams
Part 2: Percent yield
Percent yield = (actual yield)/(theoretical yield) * 100 = (6.55)/(9.24) * 100 = 70.9%
a balloon flies off when the opening is released a. Newton’s First Law b. Newton’s Second Law c. Newton’s Third Law
B. Newtons second law! Have a great day!
What is the molarity of 5.30 g of Na2CO3 dissolved in 400.0 mL solution?
5.30 g of Na2CO3 dissolved in 400.0 mL solution.
to find:the molarity
solution:[tex]mv = \frac{grams}{molar \: mass} [/tex]
[tex](x)(0.4000l) [/tex]
[tex] = 5.30g |105.988g \: {mol}^{ - 1} [/tex]
[tex] = 0.12501415m[/tex]
[tex] x = 0.125m[/tex]
therefore, the molarity of 5.30 g of Na2CO3 dissolved in 400.0 mL solution is 0.125m.
7. 06 equilibrium lab report
I need it bad if anybody has it
Chemical equilibrium is a dynamic equilibrium that is affected by changes in temperature, concentration and pressure
What is chemical equilibrium?Chemical equilibrium is a dynamic state in a chemical reaction in which the rate of forward reaction is equal to the rate of backward reaction.
For a reaction in equilibrium, the following factors affect equilibrium:
temperature pressure concentrationThe principle of chemical equilibrium states that in an isolated system in equilibrium, equilibrium will shift to annul any constraint applied in the system.
Therefore, chemical equilibrium is dynamic and is affected by temperature, concentration and pressure.
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Sodium hydroxide is a strong base. This means that ________. NaOH cannot be neutralized by a weak acid NaOH does not dissociate at all when it is dissolved in water aqueous solutions of NaOH contain equal concentrations of H (aq) and OH-(aq) NaOH dissociates completely to Na (aq) and OH-(aq) when it dissolves in water NaOH produces a gaseous product when it is neutralized
Sodium hydroxide is a strong base means that NaOH dissociates completely to Na (aq) and OH-(aq)
What is a strong base?A strong base is a base that is completely dissociates in solution to yeild the hydroxide ion in high concentration.
Hence, the fact that sodium hydroxide is a strong base means that NaOH dissociates completely to Na (aq) and OH-(aq) when it dissolves in water.
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What is the pH of a solution that has a [H+] of 2.5x10-OM.
Answer:
[tex]ph \: of \: a \: solution \: = - \: log \: ( {h}^{ + } ) \\ given \: ( {h}^{ + } ) = 2 \times {10}^{ - 5} \\ = ph = - log \: (2 \times {10}^{ - 5} ) \: = 5 - log \: 2 = 4.7[/tex]
Please help me i dont understand this
Considering the Avogadro's Law, 1.52 moles are left in the container.
Avogadro's LawAvogadro's Law is a gas law that establishes the relationship between the amount of gas and its volume when temperature and pressure are held constant.
This law states that the volume is directly proportional to the amount of gas: if the amount of gas increases, the volume will increase; while if the amount of gas decreases, the volume decreases.
Mathematically the law can be expressed as:
[tex]\frac{V}{n}=k[/tex]
Assuming that you have a certain amount of gas n1 that occupies a volume V1 and the amount of gas varies until a new value n2, then the volume will change to V2, and the following will be true:
[tex]\frac{V1}{n1}=\frac{V2}{n2}[/tex]
Amount of moles left in this caseIn this case, you know:
V1= 65 Ln1= 2 molesV2= 49.4 Ln2= ?Replacing in the Avogadro's Law:
[tex]\frac{65 L}{2 moles}=\frac{49.4 L}{n2}[/tex]
Solving:
[tex]n2x\frac{65 L}{2 moles}=49.4 L[/tex]
[tex]n2=\frac{49.4 L}{\frac{65 L}{2 moles}}[/tex]
n2= 1.52 moles
Finally, 1.52 moles are left in the container.
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Question 4(Multiple Choice Worth 5 points)
(06.01 LC)
Which of the following properties of an object affects the gravitational force it exerts?
Its color
Its mass
Its shape
Its temperature
Answer:
b
Explanation:
Complete and balance the following half-reaction in acidic solution.
Answer: Heyo Kenji Here! Here's your answer- N2(g) → NH4+(aq)
Explanation: Hope this helps!
Have a nice day!
- Kenji ^^
PLS HELP I NEED ASAP
what is the slowest speed for an object to escape the gravitational attraction of a celestial body (planet, moon, etc.)?
Answer:
the escape velocity
Explanation:
To do this, your rock has to go very fast – more than 11 kilometers per second. This velocity is called the escape velocity, the speed an object must achieve in order to overcome the gravitational attraction of a celestial body (be it a planet, a star, or a galaxy) and escape into space
found it online, lol better then nothing
How would aluminum and phosphorus form a bond
Explanation:
Aluminum happens to have 3 extra electron's. luckily, every phosphorus atom is looking to gain 3 electrons. it is a perfect match!!!
The Henry's law constant for H2 is 8.1×10−4 Matm at 25∘C. What pressure of hydrogen is needed to maintain a H2 concentration of 0.42 M?
The pressure of hydrogen needed to maintain a H₂ concentration of 0.42 M is 518.5 atm
Henry's lawThis states that the solubility / concentration of a gas in liquids at constant temperature is proportional to its pressure. Mathematically, it can be expressed as
S = KP
Where
S is the solubility / concentration K is the Henry's constant P is the pressure How to determine the pressure Henry's constant (K) = 8.1×10¯⁴ M/atmConcentration (S) = 0.42 MPressure (P) =?P = S / K
P = 0.42 / 8.1×10¯⁴
P = 518.5 atm
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Convert 10.1 kcal to J
1cal=4.184J
Hence
10.1kcal10.1(1000)cal10100cal10100(4.184)42258.4J