Answer:
88g
Explanation:
Since the total mass of substances used up in the reaction must be equal to the amount of product formed, according to the conservation of mass law, there must be 64 g + 24 g = 88 g of carbon dioxide present after the reaction.
I need help with an science IXl i need to go up to 8- its about comparing cells and cell parts somebody please save me!
Answer:
o cany give because of i am in 9th
In a calorimeter, 10.0 g of ice melts at 0oC. The enthalpy of fusion of the ice is 334 J/g.
How much heat was absorbed?
A.) 0.33 kJ
B.) .34 kJ
C.) 33.4 kJ
D.) 334 kJ
Answer:
D
Explanation:
In the problem above it is
q = mass x heat fusion
q = 10 g x 334 J/g = 3340 J. Since the ice is absorbing heat it is + 334 J.
Answer:
3.34 kJ
Explanation:
took the test
How many moles are in 25 grams of oxygen?
The number of moles in 25 grams of oxygen is equal to 1.56 moles, as 16 grams of oxygen contain one mole.
What is a mole?A mole is a unit measurement that is used to calculate a large number of chemical entities such as atoms, molecules, ions, or other particular particles.
The mass of the one mole of any chemical element in the periodic table is called atomic mass and that of any compound is known as molar mass.
The number of chemical entities present in one mole was found to be equal to approximately 6.023 × 10 ²³ which is known as Avogadro’s number. In the calculation of the number of moles of a substance the given mass of the substance is divided by its molecular mass.
Given, the mass of the oxygen = 25 grams
As we know the atomic mass of oxygen is equal to 16g/mol
So 16 g of oxygen contains moles = 1
Then 25 g of oxygen will contain moles = 25/16 = 1.56 mol
Therefore, the moles of oxygen in 25 grams are equal to 1.56.
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Which two characteristics describe reputable digital resources?
A.They contain an author’s name.
B.They sell products and services.
C.They are created by high school students.
D.They have been updated recently.
E.They can be edited by readers.
The two best characteristic best describes the reputable digital resource are the precision and accuracy.
Explanation :The more the accuracy the better the digital product.
Any slight error on application or usage may result in severe loss on product manufacturing and also loss in application purpose.
Jude has a 30.00 L cylinder full of acetylene gas that he will use for welding in his workshop. If the pressure of the cylinder is 1720 kPa and the workshop is at 20.0 °C, then how many moles of acetylene are in the tank? (Show work)
Answer:
About 21.2 moles.
Explanation:
Recall the ideal gas law:
[tex]\displaystyle PV = nRT[/tex]
Where P is the pressure of the gas; V is its volume; n is the number of moles of gas; R is the universal gas constant; and T is the absolute temperature.
Rearrange to solve for n:
[tex]\displaystyle n = \frac{PV}{RT}[/tex]
Because R has units of L-atm/mol-K, convert the pressure to atm:
[tex]\displaystyle 1720 \text{ kPa} \cdot \frac{1\text{ atm}}{101.3\text{ kPa}} = 17.0\text{ atm}[/tex]
And convert from Celsius to kelvins:
[tex]\displaystyle \begin{aligned}T _ k & = T_C + 273.15 \\ \\ & = (20.0) + 273.15 \\ \\ & = 293.2\text{ K} \end{aligned}[/tex]
Hence substitute and evaluate:
[tex]\displaystyle \begin{aligned} n & = \frac{PV}{RT} \\ \\ & = \frac{\left(17.0\text{ atm})(30.00\text{ L})}{\left(\dfrac{0.08206\text{ L-atm}}{\text{mol-K}}\right)(293.2\text{ K})} \\ \\ & = 21.2\text{ mol } \end{aligned}[/tex]
In conclusion, there are about 21.2 moles of acetylene in the tank.
Question 6 Not complete Points out of 2.0 Not flaggedFlag question Question text Separation can be achieved when a reaction occurs in a mixture. The resulting mixture will have one chemical species in a solution and the other chemical species as a solid. The mixture is centrifuged and the supernate is decanted into a separate test tube. Now the solid and solution are separated from each other. What reagent could you add to a mixture of Ag and Cu 2 to separate the two species
A reagent that could be added to a mixture of [tex]Ag^+[/tex] and [tex]Cu^{2+}[/tex] to separate this two species is hydrochloric acid (HCl).
What is a separation technique?A separation technique can be defined as a technique that is used to separate (convert) two or more mixture and solution of chemical substances into distinct products such as solutes, chemical compounds or elements.
In this scenario, a reagent that could be added to a mixture of [tex]Ag^+[/tex] and [tex]Cu^{2+}[/tex] to separate this two species is hydrochloric acid (HCl). As HCl is added to this mixture, a white precipitate would be formed by silver ions ([tex]Ag^+[/tex]) while the copper ion ([tex]Cu^{2+}[/tex]) would form a maroon precipitate.
In conclusion, the above confirmation test should be done when hydrochloric acid (HCl) is added to a mixture of [tex]Ag^+[/tex] and [tex]Cu^{2+}[/tex] as a reagent.
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A chemist conducts an experiment in which 2. 00 l of hydrogen gas is collected over water at 1. 00 ATM and 298. 15 K. The phrase over water means that the gas was collected by bubbling it into an inversed bottle filled with water which is sitting in a water bath. However the gas collected is now saturated with water vapor. The partial pressure of water vapor at 298. 15 K is 0. 0 300 ATM. Using Dalton's law calculate the pressure of the hydrogen gas in ATM
Answer:According to Dalton's law of partial pressures, the total pressure is equal to the sum of the partial pressures of each gas. In equation form, this looks like this ...
Pt = P1 + P2 + ...
Pt = total pressure
P1 = partial pressure of gas 1
P2 = partial pressure of gas 2
Explanation:
Two same charges: As charge increases, potential energy
Increases
Decreases
Stays the same ?
Answer:
decreases
i think so
byeeee
How does the shape of a molecule affect the polarity of the molecule?
A. A molecule that is symmetrical in shape will have nonpolar bonds.
O B. A molecule that has a symmetrical shape will be a nonpolar
molecule.
C. A molecule with polar bonds will be polar, regardless of its shape.
D. A molecule that is not symmetrical will be a nonpolar molecule.
Answer:
It is A
Explanation:
If you think about it, no-polar covalent bonds are in a symmetrical line, and polar bonds are on the diagonals of the center atom.
I hope I helped :)
Answer:b
Explanation:
The following list contains some common polyatomic ions. Using the charge on these ions and the idea of valence,
predict the formulas for the compound formed from the following:
potassium and permanganate
A) K(MnO4)
B) K4MnO4
C) K4MnO
D) KMnO4
Answer: or Sodium carbonate.
or Potassium permanganate
Explanation: ion carries 1 + charge whereas carbonate ion carries overall charge of -2. So for every carbonate ion, two sodium ions combine to balance the charges and thus form a stable compound,
Potassium ion carries 1 + charge where as permanganate ion carries overall charge of -1. So for every permanganate ion, one potassium ion combines to balance the charges and thus form a stable compound, Explanation:
A compound has a molecular mass of approximately 295 g. It contains 40.68% Carbon, 5.12% Hydrogen, and 54.20% Oxygen. Calculate the empirical and molecular formula.
30 POINTS!!! PLEASE I'M VERY DESPERATE!
Please help me answer the questions, I'm horrible at reading and I can't focus, please help T-T
1) elements are composed of atoms, which are the tiny building blocks that compose matter.
2) Atoms resemble a solar system: the sun being the nucleus (protons and neutrons) and the electrons being the planets that orbit the nucleus.
3) Mostly everything (food, electronics, animals, plants, air)
4) The # of protons in the element
5) The same elements that were forged by stars are also present in us
please help me answer this question?
will lithium oxide ever be a liquid on any of the planet's or moon in our system? yes or no?
Answer:
no
Explanation:
trust me i got it right on my test
Lithium oxide ever be a liquid on any of the planet's or moon in our system - No.
What is lithium oxide?Lithium oxide is an inorganic compound with the chemical formula Li₂O, and it present in white solid form.
Lithium oxide is a strong base and on reacting with water will form lithium hydroxide. In this Lithium oxide compound atrong ionic bonds is present with great attraction force. Melting point of Lithium oxide is 1,438 degree celsius and no planet and moon have this much of temperature.
So, it is not possible to get liquid Lithium oxide in our system.
Hence, answer is NO.
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Consider the substances hydrogen (H2), fluorine (F2), and hydrogen fluoride (HF). Based on their molecular structures, how does the boiling point of HF compare with the boiling points of H2 and F2? The boiling point of HF is the boiling point of H2, and it is the boiling point of F2.
Answer:
the boiling point of HF is higher than H2 and F2
Explanation:
it is because inter molecular give is present in HF because of the Hydrogen bond present. Hydrogen bond is strong and will require much energy to break ,since no hydrogen bond is in the rest H2 and F2 has a low boiling point
The boiling point of a liquid depends upon the pressure of the surrounding. Here HF has higher boiling than the molecule of hydrogen and fluorine due to the presence of hydrogen bonding between 'H' and 'F' atoms.
What is boiling point?The temperature at which the vapor pressure of the liquid becomes equal to the atmospheric pressure of the liquid's environment is defined as the boiling point. A t this temperature, the liquid is converted into a vapour.
The intermolecular forces can be used to predict the relative boiling points. If stronger is the intermolecular force, the lower is the vapor pressure of the substance and the higher is the boiling point.
The order of intermolecular forces are:
H - bonding > dipole-dipole > London dispersion (Van der Waals)
Here HF has intermolecular hydrogen bonding which is not present in H₂ and F₂ and has high boiling point.
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A sample of hydrogen at 39°c exerts a pressure of 0. 163 atm. the gas is heated to 63 °c at
constant volume. what will its new pressure be?
answer in units of atm.
Answer:
[tex]p2 = 0.175atm[/tex]
What is true about all real machines?
= equals
> greater than
work output may be < or > work input
work output > work input
work output < work input
work output = work input
Answer:It is always greater than the actual mechanical advantage because all machines must overcome friction. The mechanical advantage of a machine may be greater than, less than, or equal to 1, depending on the type of machine.
Help I really need help and don't search it on go.ogle this is a school assignment and i can get in trouble thank you sm :)
Based on your research of nuclear energy thus far, how do you feel about the use of nuclear fission as a source of energy?
Answer:
Nuclear fission is almost 5 times times more efficient than traditional fossil fuels at producing energy. That's a lot of energy packed into a small space. Nuclear energy is more efficient, which means it uses less fuel to power the plant and produces less waste.
Explanation:
How much concentrated 18 M sulfuric acid is needed to prepare 250 mL of a 6.0 M solution?
Answer:
I believe 83.33 mL is needed. :)
PLEASE HELP ASAP
Label the correct descriptors (volume, temperature, pressure, moles) *
Explanation:
1. volume
2. pressure
3. moles
4. temperature
5. temperature
6. moles
7. pressure
8. volume
9. pressure
10. volume
Chemical reactions spontaneously occur when the free energy of the products is ___________ the free energy of the reactants.
Answer:
lower
Explanation:
For a spontaneous process, the standard Gibbs free energy change has to be less than zero:
∆G° < 0 → spontaneous
∆G° > 0 → non- spontaneous
∆G° = 0 → system is at equilibrium
For a negative change in standard Gibbs free energy, the Gibbs free energy of the products has to be lower than that of the reactants since Gibbs free energy change is the standard Gibbs free energy of products minus that of the reactants.
[tex]\boxed{∆G= G°(products) -G°(reactants)}[/tex]
Mathematical derivation:
G°(products) -G°(reactants) < 0
G°(products) < G° (reactants)
✩ Note that in the image attached, the Gibbs free energy change is usually denoted by a single-headed arrow, from reactants to products.
What is free energy?
the amount of energy available to do useful workit tells us the spontaneity of a chemical processStandard state conditions
You may have noticed the superscript ° after the letter G (which stands for Gibbs free energy), and this symbol denotes standard state.implies that the pressure of a gas is 1 atmimplies that for a solute, its concentration is 1MSpontaneity
the ability of a reaction to occur without outside interventionFor example, an ice melting in a cup of hot tea is a spontaneous process (i.e. the transfer of heat from a hotter object to a cooler object is spontaneous).how dose the scientific method help scientisis?
Answer:
It helps us to insure what will the current rate will be to those subject or nartual disaster can conquere
Which type of substance is water able to dissolve? nonpolar ionic polar ionic and polar.
Water is able to dissolve polar or ionic solutes.
What is Water?Water is a liquid that is transparent or colourless, tasteless and odourless which form the Earth hydrosphere and can be use for fringing, cooking, washing, feeding animals and so on.
What is Polar Substance?Polar or ionic solvents dissolve polar or ionic solutes. Polar Substance are substances that can dissolve in water completely or polar solvent.
Water is a polar solvent and it can dissolve polar solute.
Therefore, Water is able to dissolve polar or ionic solutes.
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Answer:
the answer is d ionic and polar
Explanation:
just took the quiz and got it right
Summarize your main take away about water and hydrogen bonding.
Answer:
As water is boiled, kinetic energy causes the hydrogen bonds to break completely and allows water molecules to escape into the air as gas (steam or water vapor). When water freezes, water molecules form a crystalline structure maintained by hydrogen bonding.
Explanation:
Why does water roll off of dry ice?
What are the 3 principles of the Kinetic molecular theory?
The kinetic molecular theory is a classical model that explained the movement of gas particles. It started about constant motion and collision, and the relation of KE with temperature.
What is Kinetic molecular theory?The Kinetic molecular theory was given by several scientists including Rudolf Clausius, Boltzman, Avogadro, and Graham. It stated several principles based on observations and experiments.
It stated that matter is composed of particles that are constantly in motion and have been known to show the constant perfect elastic collision due to the addition or removal of energy.
The kinetic energy of the particles is directly proportional to the temperature of the ideal gas condition and is involved in changes in the state of matter. Higher temperature exhibits more collisions.
Therefore, the Kinetic molecular theory stated about the particles, motion, collision, temperature, etc.
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what element is not classified as a metal, nonmetal, or metalloid?
Answer:
Boron and/or Polonium
Explanation:
In the periodic table, you can see a stair-stepped line starting at Boron (B), atomic number 5, and going all the way down to Polonium (Po), atomic number 84. Except for Germanium (Ge) and Antimony (Sb), all the elements to the left of that line can be classified as metals.
How does the difference in the mass of the ball affects the changes in the distance of the object
Answer:
In very simple words ,
As the weight increases the gravitational force acting on the ball increases and thus it effects the change in the distance of the ball as the ball will fall very close to its initial distance if it has more mass and shall go far if the mass is less .
How is thermal energy generated?
Answer:
thermal energy is produced when a rise in temperature causes atoms and molecules to move faster and collide with each other.
Explanation:
I'm pretty sure its that. Hope its right!
Answer:
says wrong
Explanation:
Calculate the atomic mass of Carbon if the two common isotopes of carbon have masses of 12.000 amu (98.89 % abundance) and 13.003 amu (1.11 % abundance).
Answer:
Average atomic mass =
(mass of isotope)(%abundance)+(mass of isotope) ( abundance ) / 100
avg. atomic mass =(12)(98.89) + (13)(1.11) /100
=1186.68 + 14.43 / 100
=1201.11 / 100
=12.0111