Answer:
no
Explanation:
better use flashlichts
The specific heat of lead is 0.129 J/gC. Find the amount of heat released when 2.4 moles of lead are cooled from 37.2C to 22.5C.
Answer:
-943J or 943J released
Explanation:
m=2.4 mol x 207.g/ mol=497.3g
c=.129 J/gC
T= T f-Ti=(22.5-37.2)=-14.7C
Q=?
Q=(49.3g)(.129 J/g C) (-14.7 C)
= -943 J or 943 J released
How much energy is released when 75g of liquid water is reduced from 65c to 0c and completely freezes?
Answer:
Q = 20377.5 Joules
Explanation:
Given the following data;
Mass = 75g
Initial temperature = 65°C
Final temperature = 0°C
Specific heat capacity of water = 4.18 J/g°C.
To find the quantity of heat released;
Heat capacity is given by the formula;
[tex] Q = mcdt[/tex]
Where;
Q represents the heat capacity or quantity of heat.
m represents the mass of an object.
c represents the specific heat capacity of water.
dt represents the change in temperature.
Substituting into the equation, we have;
[tex] Q = 75 * 4.18 * 65 [/tex]
Q = 20377.5 Joules
Hii! i’m timed so can someone please answer quickly!
What is the frequency of this wave? 1,2,3, or 4
I cant find any answers to this question! i really appreciate it!
Count the in between joint bunches of curve lines .
First one at beginninglast one at end .And one is in middleFrequency is 3-1=2
The [OH-] of an aqueous solution is 3.5 x 10-5. What is the [H+]?
Answer: The concentration of hydrogen ion in the given solution is [tex]2.81 \times 10^{-10}[/tex].
Explanation:
pOH of a solution is the negative logarithm of concentration of hydroxide ions.
Hence, if [tex][OH^{-}][/tex] is [tex]3.5 \times 10^{-5}[/tex] then its pOH value is calculated as follows.
[tex]pOH = -log [OH^{-}]\\= -log (3.5 \times 10^{-5})\\= 4.45[/tex]
Now, the relation between pH and pOH is as follows.
pH + pOH = 14
pH + 4.45 = 14
pH = 14 - 4.45
= 9.55
And, pH is the negative logarithm of concentration of hydrogen ions. Hence, [tex][H^{+}][/tex] is calculated as follows.
[tex]pH = -log [H^{+}]\\9.55 = -log [H^{+}]\\H^{+} = 2.81 \times 10^{-10}[/tex]
Thus, we can conclude that the concentration of hydrogen ion in the given solution is [tex]2.81 \times 10^{-10}[/tex].
helium gas (He) effuses ___ times faster than methane (CH4)
a. 1.80
b. 2.00
c. 2.20
d. 2.40
Answer:
b 2.00
Explanation:
I am pretty sure that is right
Suppose you used a needle to poke two holes in a sealed tube of toothpaste. One hole near the cap and one hole is in the middle of the tube. You then squeeze the tube at the base. Compare how the toothpaste will leave each needle hole. Be sure to explain using theory, why this happens.
Answer:
done this before in my science class
Explanation:
the hole by the cap will have slightly more coming out at first due to all the toothpaste pushing forward, but over time, the middle will get more do to all the front end of the toothpaste being pushed out first
(sorry if that sounded confusing im tired, heres a cat)
The hole by the cap will have slightly more coming out at first due to all the toothpaste pushing forward, but over time, the middle will get more do to all the front end of the toothpaste being pushed out first.
What is toothpaste?Toothpaste is a key part of your daily oral hygiene routine. Along with your toothbrush and floss it helps to remove food debris and plaque from your teeth and gums.
Toothpastes can come in a gel, paste or powder form. While the ingredients differ slightly, all toothpastes contain the same general components.
With some help from your toothbrush, these help to remove debris and surface stains. This ingredient helps to prevent water loss, and keeps your toothpaste from drying out or getting gummy. This is what gives your toothpaste a little bit of sweetness, and that minty fresh scent. Since these do not contain sugar, they also do not promote tooth decay.
Therefore, The hole by the cap will have slightly more coming out at first due to all the toothpaste pushing forward, but over time, the middle will get more do to all the front end of the toothpaste being pushed out first.
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In making her morning tea, Dorothy drops a sugar cube into some hot water. She stirs the mixture but no longer sees the sugar cube at the bottom of her mug. Based on her observation of sugar dissolving in hot water, she can properly conclude that the sugar is
Answer:
Hydrophilic
Explanation:
A hydrophilic substance is any substance that interacts efficiently with water.
Since water is a polar solvent, a hydrophilic substance must also be polar in order to interact with water since like dissolves like in chemistry.
The fact that sugar disappears in hot water indicates that sugar is a polar hydrophilic substance because only a polar solute can dissolve in water
Based on her observation of sugar dissolving in hot water, she can properly
conclude that the sugar is hydrophilic.
A substance is said to be hydrophilic when it is able to react and dissolve in
water due to the attractive force between them. Hydrophobic substances
don't dissolve in water.
In this scenario, we were told the sugar dissolved completely in water which
means that the sugar is hydrophilic.
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asap please help !!!!
Answer: What do you need help with?
Explanation:
A biome is a collection of plants and animals that have common characteristics for the environment they exist in. They can be found over a range of continents. Biomes are distinct biological communities that have formed in response to a shared physical climate.
HELP ASAP
Which of these atoms ihas the HIGHEST reactivity?
Answer:
aaaaaaaaaaaaaaaaaaaaaaaaassaaaa
If the temperature of 68.8 g of ethanol increases from 40.0(C to 71.3(C, how much heat has been absorbed by the ethanol? (Specific heat of ethanol is 2.44 j/g((C)
Answer:
Q = 5254.39 J
Explanation:
Given that,
Mass of ethanol, m = 68.8 g
The temperature increases from 40.0°C to 71.3°C.
The specific heat of ethanol is 2.44 j/g°C
We need to find the heat absorbed by the ethanol. We know that the heat absorbed due to the change in temperature is given by :
[tex]Q=mc\Delta T[/tex]
Put all the values,
[tex]Q=68.8\times 2.44\times (71.3-40)\\\\Q=5254.39\ J[/tex]
So, 5254.39 J of heat is absorbed by Ethanol.
How is a TV like our brain?
Answer:
Explanation:
Because your brain and the TV are programed to do certain things. As if you're going back into a memory, and you're simply rewatching a season of Beyblade: Metal Fusion on the TV.
What is the new concentration of a solution after 250mL of 2.5M sulfuric acid is diluted to a final volume of 700mL?
Please show your work
Answer:
The new concentration of the solution is 0.89 M.
Explanation:
In chemistry, dilution is the reduction in concentration of a chemical in a solution. This is accomplished by adding more solvent to the same amount of solute.
So, in a dilution, the amount of solute does not vary, but the volume of the solvent varies: as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.
In a dilution the expression is used:
Ci*Vi = Cf*Vf
where:
Ci: initial concentration Vi: initial volume Cf: final concentration Vf: final volumeIn this case:
Ci= 2.5 M Vi= 250 mLCf=? Vf= 700 mLReplacing:
2.5 M* 250 mL= Cf* 700 mL
Solving:
[tex]Cf=\frac{2.5 M*250 mL}{700 mL}[/tex]
Cf= 0.89 M
The new concentration of the solution is 0.89 M.
74.5 g of was dissolved in 1000. of water. What is the molality of the solution? (Molar mass of KCl = 74.5g / m * o * l ; Density of water = 1.00 g/mol )
Answer: 1.00 m
Explanation:
.What is the significance of genetic variation within the population of moths during and after the Industrial Revolution in London?
Answer:
The evolution of the peppered moth is an evolutionary instance of directional colour change in the moth. The frequency of dark-coloured moths increased at that time, an example of industrial melanism.
Explanation:
I did this on Savvas Realize got it right.
Genetic variation is said to be the difference in the hereditary sequence. After the industrial revolution, the frequency of the dark-colored moth increased dramatically more than the light-colored moths.
What is industrial melanism?
Industrial melanism was an example of the evolutionary effect that occurred in the moths where the dark-colored species were favored over the light-colored species of peppered moths.
Before the industrial population, light-colored moths were large in number which later decreased with an increase in pollution. This occurred due to an increase in the pollutants and dust deposition that altered the environment.
As the pollution increased over time the dark-colored moths became dominant and increased their population over time. This is an example of industrial melanism as the color of the body was the determining factor in survival.
Therefore, dark-colored moths were prevalent after the industrial revolution.
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PLZ HELP PLZ PLZ ILL MARK AS BRAINLIESTT!!!!
Q.1-
Given,
mass - 10grams
volume - 24 cm³
density = mass/volume
density = 10/24
density = 0.416 g/cm³
Q.2-
Given,
mass - 700grams
volume - 1100cm³
density = mass/volume
density = 700/1100
density = 0.6363 g/cm³
Please help I will give brainliest!!!
Use dot and cross diagrams to explain the differences between ionic and covalent bonding (200) words
Describe how you could show that a compound is an acid
Based on its location on the periodic table, how many electrons does oxygen have in its
outer energy level? (2 points)
O 3
O4
O 5
O 6
Answer:
O 6
Explanation:
Oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell.
4) The equilibrium constant, Kc, is 3.2 x 10-34 at 25 °C for the reaction represented
below.
2 HCl(g) = H2(g) + Cl2(g)
a. Write the equilibrium expression, Kc, for the reaction.
b. Suppose you start out with only reactants in a rigid container at 25°C. The
initial concentration of HCl(g) is measured to be 0.375 M. What are the
concentrations of each gas when the system reaches equilibrium?
Answer:
a. Kc = [H2] [Cl2] / [HCl]²
b. [H2] = 6.7x10⁻¹⁸M
[Cl2] = 6.7x10⁻¹⁸M
HCl ≈ 0.375M
Explanation:
a. The expression, Kc, is defined as the ratio of the concentrations of the products over reactants powered to its coefficients. For the reaction, Kc is:
Kc = 3.2x10⁻³⁴ = [H2] [Cl2] / [HCl]²b. If you start with a concentration of HCl of 0.375M, the concentrations in equilibrium are:
[H2] = X
[Cl2] = X
[HCl] = 0.375M - 2X
Where X is reaction coordinate
Replacing:
3.2x10⁻³⁴ = [X] [X] / [0.375M - 2X]²
3.2x10⁻³⁴ = X² / 0.140625 - 1.5 x + 4 X²
4.5x10⁻³⁵ - 4.8x10⁻³⁴X + 1.28x10⁻³³X² = X²
4.5x10⁻³⁵ - 4.8x10⁻³⁴X - X² = 0
Solving for X:
X = -6.7x10⁻¹⁸. False solution, there is no negative concentrations
X = 6.7x10⁻¹⁸M
Thus:
[H2] = 6.7x10⁻¹⁸M
[Cl2] = 6.7x10⁻¹⁸M
HCl ≈ 0.375M
The correct Answer is:
Answer a. Kc = [H2] [Cl2] / [HCl]²
Answer b. [H2] = 6.7x10⁻¹⁸M
Then [Cl2] = 6.7x10⁻¹⁸M
Now, HCl ≈ 0.375M
Explanation:a. When The first expression, Kc, is defined as the ratio of the concentrations of the products that will be over reactants powered to its coefficients. For the reaction, Kc is:
After that Kc = 3.2x10⁻³⁴ = [H2] [Cl2] / [HCl]²b. When If you start with a concentration of HCl of 0.375M, so that, concentrations in equilibrium are:
After that [H2] = X Now, [Cl2] = X So that, [HCl] = 0.375M - 2X Where X is reaction coordinate After that the Replacing: 3.2x10⁻³⁴ = [X] [X] / [0.375M - 2X]² 3.2x10⁻³⁴ = X² / 0.140625 - 1.5 x + 4 X² 4.5x10⁻³⁵ - 4.8x10⁻³⁴X + 1.28x10⁻³³X² = X² 4.5x10⁻³⁵ - 4.8x10⁻³⁴X - X² = 0 After Solving for X that is: Then X = -6.7x10⁻¹⁸. False solution, there is no negative concentrations Then X = 6.7x10⁻¹⁸M Thus that: When [H2] = 6.7x10⁻¹⁸M When [Cl2] = 6.7x10⁻¹⁸M Then HCl ≈ 0.375MLearn more about:
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Water is boiling in a clear pot, as shown in the picture.
How do the water molecules closest to the burner compare to the water molecules closest to the surface of the liquid?
Answer:
How do the water molecules closest to the burner compare to the water molecules closest to the surface of the liquid? ... They are closer together and moving slower than those at the surface. They are more spread out and moving faster than those at the surface. The diagram shows the sun's interior.
Explanation:
Answer:
it's c if u don't want to read all that
Explanation:
Water and phosphorus with a total mass of 200 grams are added to a flask like the one below and then the flask is sealed with a rubber stopper. The flask is then heated up so that a reaction occurs but no gas from the reaction escapes the flask. How much mass would you expect to be in the flask after the reaction occurs
Answer:
h20 o3vbjbxhnnhbnkknnchemesry
The two main postulates that was given by Antoine Lavoisier are, oxygen play an important role in combustion and the other is mass of the reactant and product is conserved. The total mass will be 200g in the flask after the reaction occurs.
What is law of conservation of mass?According to Law of conservation of mass, mass can neither be created nor be destroyed. Mass can only be transformed from one form to another. The law of conservation of mass was given by Antoine Lavoisier. Every reaction in nature follow the law given by Antoine Lavoisier that is mass is always conserved.
The total mass of reactant water, phosphorous is 200g, then the total mass of product will remain same after reaction according to law of conservation of mass.
Therefore, the total mass will be 200g in the flask after the reaction occurs.
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How do alpha particles compare to gamma rays?
Answer:
Unlike alpha and beta particles, which have both energy and mass, gamma rays are pure energy. Gamma rays are similar to visible light, but have much higher energy. Gamma rays are often emitted along with alpha or beta particles during radioactive decay.
-Radiation basics.
Explanation:
Answer:
Unlike alpha and beta particles, which have both energy and mass, gamma rays are pure energy. Gamma rays are similar to visable light, but have much higher energy. Gamma rays are often emitted along with alpha or beta particles during radioactive decay.
Explanation:
Which is not an example of a
parasite/host relationship?
A flea on a dog
A tick on a horse
A toad on a lily pad
A barnacle on a whale
Answer:
A toad on lily pad
Explanation:
have a great day
What volume, in milliliters, of calcium chloride 15.0 M stock solution would you use to
make 500 mL of 0.300M of calcium chloride solution?
20
5
15
10
Answer: The volume of stock solution of calcium chloride required is 10 mL.
Explanation:
A solution consists of solute and solvent. A solute is defined as the component that is present in a smaller proportion while the solvent is defined as the component that is present in a larger proportion.
To calculate the amount of solute needed, the formula used is:
[tex]C_1V_1=C_2V_2[/tex] ....(1)
where,
[tex]C_1\text{ and }V_1[/tex] are the concentration and volume of stock solution of calcium chloride
[tex]C_2\text{ and }V_2[/tex] are the concentration and volume of diluted solution of calcium chloride
Given values:
[tex]C_1=15.0M\\C_2=0.300M\\V_2=500mL[/tex]
Plugging values in equation 1:
[tex]15.0\times V_2=0.300\times 500\\\\V_2=10mL[/tex]
Hence, the volume of stock solution of calcium chloride required is 10 mL.
What is the molarity of a solution in which 25.3 grams of potassium bromide is dissolved in 150. mL of solution?
Answer:
~1.417M
Explanation:
Molarity=(number of moles of solute)/(litres of solution)
In this case, we need to find moles of potassium bromide.
Mass=25.3g
Molar mass= 119g/mol
moles=(mass/molar mass)
=(25.3)/(119)
=0.2126moles of potassium bromide
Molarity=(0.2126)/(150/1000)
~1.417M
Hope this helps:)
Answer:
[tex]\boxed {\boxed {\sf molarity \approx 1.42 \ M \ KBr}}[/tex]
Explanation:
Molarity is a measure of concentration in moles per liter.
[tex]molarity= \frac{moles \ of \ solute}{ liters \ of \ solution}}[/tex]
1. Find Formula for CompoundWe have the compound potassium bromide. Potassium (K) has an oxidation state of +1 and bromine (Br) has -1. They bond in a 1:1 ratio, so the formula is KBr.
2. Convert Grams to MolesWe are given the amount of solute in grams, but we need moles. To convert, we use the molar mass. These values are found on the Periodic Table. They are the same as the atomic masses, but the units are grams per moles (g/mol) instead of atomic mass units (amu).
Look up the individual element's molar mass.
Potassium: 39.098 g/molBromine: 79.90 g/molThe formula of KBr contains no subscripts, so we can add the molar masses.
KBr: 39.098+ 79.90 =118.99 g/molUse the molar mass as a ratio.
[tex]\frac {118.998 \ g\ KBr}{ 1 \ mol \ KBr}[/tex]
We want to convert 25.3 grams, so we multiply by that value.
[tex]25.3 \ g\ KBr*\frac {118.998 \ g\ KBr}{ 1 \ mol \ KBr}[/tex]
Flip the ratio so the units of grams of KBr cancel.
[tex]25.3 \ g\ KBr*\frac{ 1 \ mol \ KBr}{118.998 \ g\ KBr}[/tex]
[tex]25.3*\frac{ 1 \ mol \ KBr}{118.998} = 0.2126086153\ mol \ KBr[/tex]
3. Convert Milliliters to LitersMolarity uses liters, so we must convert the 150 milliliters. 1 liter contains 1000 milliliters.
[tex]\frac{1 \ L }{1000 \ ml}[/tex]
[tex]150 \ mL *\frac{1 \ L }{1000 \ ml}[/tex]
[tex]150 *\frac{1 \ L }{1000}= 0.150 \ L[/tex]
4. Calculate MolarityNow we have the moles of solute and liters of solution, so we can find molarity.
[tex]molarity= \frac{ moles \ of \ solute}{liters \ of \ solution}[/tex]
[tex]molarity= \frac{0.2126086153 \ mol \ KBr}{ 0.150 \ L}[/tex]
[tex]molarity = 1.417390768\ mol KBr/L[/tex]
The original measurements had 3 significant figures, so our answer must have the same. For the number we found, that is the hundredth place. The 7 in the thousandth place tells us to round the 1 to a 2.
[tex]molarity \approx 1.42 \ mol KBr/L[/tex]
1 mole per liter is equal to 1 Molar (M), so we must convert the units.
[tex]molarity \approx 1.42 \ M \ KBr[/tex]
Look at the diagram below. According to the diagram, what substance(s) are the
reactant(s)? What substance(s) are the product(s)? Explain your reasoning.
NH3(aq) + HCI (aa)
Ammonia Hydrochloric acid
NHCI (aa)
Ammonium chloride
You will be graded on the following rubric:
luje
Answer:
NH3(aq) and HCl(aq) are the reactants, while NH4Cl(aq) is the product.
Explanation:
The hydrogen atom from the HCl molecule joins the other three in NH3 creating a four hydrogen molecule, NH4Cl.
Ciencias: una perturbación que transfiere energía de un lugar a otro que es ?
Answer:
Una onda es una perturbación que se propaga en el espacio, transportando energía pero no materia.
Explanation:
help me please i don’t understand this
In order to calculate the number of neutrons you must subtract the what from the what?
Answer:
You take the atomic, or proton number of the element, and you subtract it from the element's mass number.
Answer:
protons
Explanation:
neutrons and protons make up the mass of the atom
Calculate the amount of 0.1 M acid needed to neutralize 10,000 liters of pH 8.0 water. The acid is carbonic acid (H₂CO₃).
Answer:
50mL of the 0.1M acid are needed to neutralize the solution
Explanation:
To solve this question we have to calculate the moles of OH- present in the basic solution. Based on the reaction:
2OH- + H2CO3 → 2H2O + CO3²⁻
we can find the moles of carbonic acid (And its volume) required for the complete neutralization as follows:
Moles OH-:
pH = -log [H+]
10^-pH = [H+]
[H+] = 1x10⁻⁸M
As:
[OH-] = Kw / [H+]
[OH-] = 1x10⁻¹⁴ / 1x10⁻⁸
[OH⁻] = 1x10⁻⁶M
The moles in 10000L are:
10000L * (1x10⁻⁶moles OH- / L) = 0.01 moles OH-
Moles H₂CO₃ required:
0.01 moles OH- * (1mol H₂CO₃ / 2mol OH⁻) = 0.005 moles H₂CO₃
Volume:
0.005 moles H₂CO₃ * (1L / 0.1moles) = 0.05L =
50mL of the 0.1M acid are needed to neutralize the solution