Answer:
Graph? Question is incomplete.
Why do you think Newton’s cradle stops swinging? What does this imply about the energy in the system of pendulums?
The pressure in a certain tire is 109 kPa, what is the pressure of the air in the tire in
psi?
Answer:
pressure ranges between 30 and 35 PSI
Explanation:
Answer:
1.08 atm
Explanation:
I hope you pass !!
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Answer:
1.42L of the 9.0M NaOH are required
Explanation:
Molarity is an unit of concentration in chemistry defined as the ratio of the moles of a solute (In this case NaOH) and the volume of the solution.
To solve this question we must know the moles of NaOH required in 4.25L of a 3.0M NaOH as follows:
4.25L * (3.0moles / L) = 12.75 moles of NaOH are required
As all NaOH must come from the 9.0M NaOH the volume we need is:
12.75 moles NaOH * (1L / 9.0 moles NaOH) =
1.42L of the 9.0M NaOH are requiredHow many formula units are in 2.0 moles of Fe(NO3)2?
Answer:
1.2 x 10>24 (2.0)(6.022 x 10>23)
Explanation:
How many formula units are in 2.0 moles of Fe(NO3)2?
Mole measure the number of elementary entities of a given substance that are present in a given sample. 12.044×10²³ formula units are in 2 moles of Fe(NO₃)₂.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. Mole is inversely proportional to molar mass.
Mathematically,
Mole of Fe(NO₃)₂. =given number of atoms of Fe(NO₃)₂.÷ 6.022×10²³(Avogadro number)
mole of Fe(NO₃)₂= 2moles
Substituting the values
2=number of atoms of Fe(NO₃)₂.÷ 6.022×10²³
Number of atoms of Fe(NO₃)₂.=2×6.022×10²³
Number of atoms of Fe(NO₃)₂.=12.044×10²³
Therefore, 12.044×10²³ formula units are in 2 moles of Fe(NO₃)₂.
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You observe mothballs disappearing in cabinets. What do you think is the reason for this? Do all substances behave like mothballs at normal conditions? Explain by citing some examples Need lang po for science ;(
Answer: Mothballs have weak intermolecular forces.
No all substances do not behave like mothballs at normal conditions. Example: benzene , chloroform
Explanation:
Sublimation is a process of converting a substance from solid state to gaseous state without the formation of liquid at constant temperature.
A substance which undergoes sublimation is called as sublimating substance.
As mothballs is made of napthalene which has weak inter molecular forces of attraction between its molecules, it directly sublimes into gaseous state without leaving any residue and is called as a sublimating substance.
Not all substances behave like mothballs at normal conditions. Example: benzene , chloroform
Due to weak intermolecular attraction force mothballs will disappear and not every compound show this type of behavior like benzene and chloroform.
What are mothballs?Mothballs are also known as Naphthalene balls, they are the aromatic organic compounds and they are the members of the sublimating substance family as they directly convert into gaseous state from the solid state.
In the mothballs or naphthalene balls, there is a weak attraction of force London dispersion force is present between their constitute particles, and in normal condition they show sublimation and gets disappear. Not all aromatic compounds behave like these balls as not in all compounds these types of force present, for example in benzene and chloroform strong covalent bond is present.
Hence, not all compounds behave like mothballs and they show that property due to weak attraction force.
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Using the periodic table, determine the number of PROTONS for the element Li
kadalasang pinupuntahan ng mga patalastas
HELP A #QUEEN OUT !!!!!!
Select the correct answer.
Which reaction is a decomposition reaction?
A.
2KClO3 → 2KCl + 3O2
B.
4Na + O2 → 2Na2O
C.
ZnS + 3O2 → 2ZnO + 2SO2
D.
2NaBr + CaF2 → 2NaF + CaBr2
Answer: 2KClO3 → 2KCl + 3O2
Explanation: it's the only one that was broken down into more parts than the start, the rest were simply reseperated
this one : 1 → 2
b : 1 + 1 = 2
c : xy+ wz → wy + xz
d : qwer +tyuio → qwui + tyero
ALSO I got it right
Which one is not a long-term environmental change?
Pollution
Swimming
Deforestation
Climate Change
Answer:
Swimming
Explanation:
Pollution is almost irreversible and takes forever to fix. deforestation leads to bad air quality and the erosion of the ground. climate change can melt polar caps or for instance freeze texas.
if the hydrogen ion concentration [H+] in a solution is 1.87 x 10^-11M what is the [OH-]
By using pH formula, the concentration of hydroxyl ion [OH-] will be 5.3 ×[tex]10^{-4}[/tex] M.
What is pH?
The pH scale is a measurement of hydrogen ion concentration that is used to determine the acidity as well as alkalinity of a solution.
Calculation of [OH-] by using formula of pH.
Given data:
[H+] = 1.87 x [tex]10^{-11} M[/tex]
[OH-] = ?
Calculation of [OH-] is shown below:
It can be calculated by using the formula:
pH = -log [H+]
Put the value of concentration of hydrogen ion [H+] in above formula.
pH = -log (1.87 x [tex]10^{-11} M[/tex])
pH = -log (1.87) -log ( [tex]10^{-11} M[/tex])
pH = -0.27 +11
pH = 10.73
Now, use the formula, pH +pOH = 14
pOH = 14 - pH
pOH = 14 - 10.73
pOH = 3.27
Now, use formula pOH = -log [OH-]
[OH-] = [tex]10^{-pOH}[/tex]
[OH-] = [tex]10^{-3.27}[/tex]
[OH-] = 5.3 ×[tex]10^{-4}[/tex] M
Therefore, the concentration of hydroxyl ion [OH-] will be 5.3 ×[tex]10^{-4}[/tex] M.
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HELPPP!!!
Using the following data, which is the correct rate law of the sample reaction?
A5B + 6C 3D + 3E
Experiment (A) (M) [B] (M) [C](M) Initial Rate (M/s)
1
0.35 0.35 0,35 8.0 x 104
2
0.70
0.35
0.35
3.2 x 10-
3
0.70
0.70
0.35
6,4 x 10-8
4
0.70
0.35
0.70
3.2 x 10-3
A.) K[A]^2 [B]^1 [C]^1
B.) K[A]4 [B]^2 [C]^1
C.) K(A)^2 [B]^1 [C]^O
D.) k[A]^1 (B)^2 [C]^O
i think its C not so sure rho
good ,uck!!!!
Based on the data given, the correct rate law of the sample reaction is: C. [tex]R = K[A]^2[B]^1[C]^0[/tex]
What is the rate law?Rate law can be defined as a chemical equation that is typically used to relate the initial (forward) chemical reaction rate with respect to the concentrations or pressures of the chemical reactants and constant parameters.
Mathematically, the rate law is given by this formula:
[tex]R = K[A]^x[B]^y[C]^z[/tex]
Where:
k is the rate constant.A is the concentration of reactant A.B is the concentration of reactant B.C is the concentration of reactant C.x, y, and z are the order of the reaction.Based on the data given, the correct rate law of the sample reaction is as follows:
[tex]R = K[A]^2[B]^1[C]^0[/tex]
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Name the following alkyne:
CH3CH2C = C - CI
Answer:
The answer was be 1-chloro-1-butyne
Explanation:
In other words the answer is option letter A
You welcome have a nice day.
The name of the given alkyne, CH₃CH₂C = C – CI is 1 chloro 1 butyne.
The correct option is A.
What are alkynes?Alkynes are unsaturated hydrocarbons, that have carbon-carbon triple bonds.
Chlorobutyne is colorless and is liquid at room temperature and pressure.
It is polar, but still slightly soluble in water.
Thus, the correct option is A, 1 chloro 1 butyne.
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1. The pH of a solution made by combining 150.0 mL of 0.10 M KOH with 50.0 mL of 0.20 M HBr is closest to which of the following?
Answer:
12
Explanation:
The pH of the solution prepared has been 1.25.
The pH of the solution resulting from the mixing of the two solutions can be given by:
Hydrogen ion concentration = [tex]\rm \dfrac{M_1V_1\;-\;M_2V_2}{V_1\;+\;V_2}[/tex]
Where, M1 and M2 have been the molarity of the solution and V1 and V2 have been the volume of the solutions.
For the given resulted solution:
Hydrogen ion concentration = [tex]\rm \dfrac{0.1\;\times\;0.15L\;-\;0.2\;\times\;0.05L}{0.15\;+\;0.05\;L}[/tex]
Hydrogen ion concentration = 0.055 M
pH can be defined as the negative logarithm of hydrogen ion concentration.
pH = - log (Hydrogen ion concentration)
pH = -log (0.055)
pH = 1.25
The pH of the solution prepared has been 1.25.
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ADD NOTE
QUESTION GUIDE EXIT TES
3. A sample of 0.0400 mol potassium hydroxide, KOH was dissolved in water to yield 20.0 ml of
solution. What is the molarity of the solution?
Answer:
2.00 M KOH
Explanation:
Divide moles by volume and make sure your volume is in LITERS, not mL.
0.0400 mol KOH / 0.0200 L = 2.00 M KOH
A sample of 0.0400 mol potassium hydroxide, KOH was dissolved in water to yield 20.0 ml of solution. The molarity of the solution is 2.00 M KOH.
What is molarity?Molarity is the measure of the concentration of any solute in per unit volume of the solution.
[tex]M = \dfrac{n}{V}[/tex]
Given, the 0.0400 mol potassium hydroxide
20.0 ml volume
Putting the values in the equation
[tex]\dfrac{0.0400 mol }{ 0.0200 ml} = 2 M[/tex]
Thus, the molarity of the solution is 2.00 M KOH.
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The car is heading north covering a distance of 500 meters in 20 seconds. What is the car’s velocity?
1.Si dos átomos tienen el mismo "Z" pero diferente "A" se trata de : a) Nucleones b) Isótopos c) Mesones
Answer:
Si dos átomos tienen el mismo "Z" pero diferente "A" se trata de Isótopos.
Explanation:
Cada elemento químico se caracteriza por el número de protones de su núcleo, que se denomina número atómico Z. Pero en el núcleo de cada elemento también es posible encontrar neutrones, cuyo número puede variar. La masa atómica (A) se obtiene sumando el número de protones y de neutrones de un núcleo determinado.
Un mismo elemento químico puede estar constituido por átomos diferentes, es decir, sus números atómicos son iguales, pero el número másico es distinto. Estos átomos se denominan isótopos del elemento. Si a un átomo se le añade un neutrón, se convierte en un isótopo de ese elemento químico. En otras palabras, se denomina isótopos a los átomos de un mismo elemento, cuyos núcleos tienen una cantidad diferente de neutrones.
Los isótopos de un elemento tienen las mismas propiedades químicas, pero difieren algo en sus propiedades físicas.
Entonces, si dos átomos tienen el mismo "Z" pero diferente "A" se trata de Isótopos.
Name two processes which provide the best evidence for the motion of particles in matter.
Answer:
Diffusion and Brownian motion are the two processes which provide best evidence for the motion of particles in matter.
Exothermic reactions have _____ net bond energy.
A) positive
B) negative
C) neutral
2
In the movie, Tim says that Saturn's rings refract light to
produce colors. What does this mean?
A They emit light
B They bend and reflect light
CThey absorb all light
D They block light
Answer:
It would be B they bend to reflect light
In the image of the billiard table below, a cue ball is about to be struck and pushed toward the other balls
When the cue ball collides with the other balls, it will slow down and the other balls will be set in motion. Which statements best
describes why?
OA. The cue ball loses all of its kinetic energy, and the other balls gain some kinetic energy
OB. The cue ball loses all of its kinetic energy, and the other balls gain some potential energy
OC. The cue ball loses some of its potential energy, and the other balls gain some kinetic energy
OD. The cue ball loses some kinetic energy, and the other balls gain some kinetic energy
Answer:
c
Explanation:
A piece of metal is composed of atoms. Each atom in the metal contains 29 protons. How is the metal classified?
Answer:
Explanation:
The metal is classified as a transition metal or transition element. In particular, this atom is Copper it has an atomic number of 29 which we know by the number of protons. The number of protons in an atom is the same as the atomic number.
Answer:
Copper
Explanation:
Each atom in the metal contains 29 protons.
If 4.00 moles of gasoline are burned, what volume of oxygen is needed if the pressure is 0.953 atm, and the temperature is 35.0°C?
Answer:
1325 L
Explanation:
For this excersise we assume gasoline as an octane.
The combustion is:
2C₈H₁₈ + 25 O₂ → 16 CO₂ + 18H₂O
2 moles of octane react to 25 moles of oxygen, according to stoichiometry.
If we have 4 moles of gasoline, we need (4 . 25)/2 = 50 moles of oxygen.
We can apply the Ideal Gases Law to solve this.
We convert T° to Absolute Value
35°C + 273 = 308K
P . V = n . R . T
V = (n . R . T) / P → (50 mol . 0.082 mol.K/L.atm . 308K) / 0.953 atm
Volume = 1325 L
What are the types of changes that occur when matter is heated ? Which of these changes produce new substances ?
When you heat something, you add energy to it. This causes the particles to move faster and farther apart. Heating solids turns them into liquids. Turning a solid into a liquid is called melting. Chemical Changes are also called Chemical Reactions. Chemical reactions involve combining different substances. The chemical reaction produces a new substance with new and different physical and chemical properties.
sand is a particulate in nature
Answer:
[tex]\color{Blue}\huge\boxed{Answer} [/tex]
Sand is a granular material composed of finely divided rock and mineral particles. Sand has various compositions but is defined by its grain size. Sand grains are smaller than gravel and coarser than silt.
Help a person out please
Explanation:
here I haven't drawn the diagram but I have marked them where they will be .
So if it helps don't forget to like and Mark me
8.Which of the following is a base?
a) H2SO4
b) HNO3
c) HCl
d) NaOH
9. Which of the following is an acid?
a) Mg(OH)2
b) Al(OH)3
c) H2CO3
d) NH4OH
Answer:
Explanation:
Unit 10 - Acid/Base ... (a) Mg(OH. 2. ) (b) Mg(OH). 2. (c) Mg. 2. OH. (d) MgOH. 2. Standard: ... balanced equation for these neutralization reactions: 3. HCl + NaOH → ... H2CO3 + Ca(OH)2 → ... C5.7B Predict products of an acid-base neutralization. 8. 2 NH4OH + H2S ...An Arrhenius base is a compound that increases the OH − ion concentration in ... and a base is called a neutralization reaction and can be represented as follows: ... chemical equation for the neutralization reaction between HCl and Mg(OH) 2. ... acid, an Arrhenius base, or neither. a) NaOH. b) C 2H 5OH. c) H 3PO 4. 6
Comprehension Questions:
1. What are the horizontal (from left to
right) parts of the periodic table
called?
Which of the following is a symptom of mycoplasmosis in birds?
A. itchy rash
B. white ulcers
C. cloudy eyes
D. swollen joints
Answer:
Cloudy eyes
Explanation:
The article talks about eye infection
why does the earth experience seasons?
What is a gluon?
A. A particle that binds quarks to one another
B. A radioactive particle
C. An electrostatic force
D. A weak nuclear force
Answer:
A
Explanation:
it binds quarks together
In quantum chromodynamics the theory of the strong force, the interactions of the quarks are described in terms of eight types of massless gluon. A gluon is a particle that binds quarks to one another. The correct option is A.
What is gluon?The gluon, so called the messenger particles is defined as the strong nuclear force which binds the subatomic particles known as quarks within the protons and neutrons of stable matter as well as within heavier short-lived particles at high energies.
It has been found that the quarks interact by emitting and absorbing gluons just as electrically charged particles interact through the emission and absorption of photons. Like quarks the gluons carry a strong charge known as colour. This means that gluons can interact between themselves through the strong force.
The gluons have no electric charge.
Thus the correct option is A.
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