What kind of change forms a new substance?
A physical change
Answer:
Chemical change
Explanation: Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances.
calculate the pOH of 0.0001 NaOH in water
Answer:
pOH = 4
Explanation:
NaOH is a strong base which means that it dissociates completely in water. It will break apart into Na⁺ and OH⁻ ions.
NaOH ⇒ Na⁺ + OH⁻
Because NaOH dissociates completely into its respective ions in water, the moles of NaOH is equal to the moles of hydroxide ions. So, [OH⁻] = 0.0001 M.
Now to find the pOH, use the formula pOH = -log[OH⁻].
pOH = -log[OH⁻]
= -log(0.0001)
= 4
The pOH of the solution is 4.
Hope that helps.
What configuration elements of sodium
The electron configuration of Sodium (Na) : 1s²2s²2p⁶3s¹
Further explanationSodium is an element with the symbol Na and has the atomic number 11. It is located in Group 1 (alkaline) and period 3
atomic number=number of electron=11
In an atom there are levels of energy in the shell and sub shell
This energy level is expressed in the form of electron configurations.
Charging electrons in the sub shell uses the following sequence:
1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc.
So the electron configuration for Natrium ( with 11 electrons) :
1s²2s²2p⁶3s¹ or we can write [Ne] 3s¹
I (1) Did your upper lip area feel warmer or cooler? _____________________
(2) Was the stretching process endothermic or exothermic for the rubber band? ________________
(3) Explain your reasoning.
II
(4) Amount of NaHCO3 used/measured out _______________________ teaspoons
(4a) Observations on Sodium Bicarbonate
(4b) Is sodium bicarbonate water soluble? ______________
(5) Observations on Acetic Acid (vinegar) solution
(6) Observations after the addition of the first tablespoon of vinegar to the sodium bicarbonate
(7) Total amount of HC2H3O2 solution used for the reaction to go to completion _______ tbs
(8a) Overall observations on the reaction. [How was the CO2 gas production observed?]
(8b) How did you determine when the reaction was complete?
(Give at least 2 indications/observations).
(9a). Amount of NaC2H3O2 solid produced _____________________________
(9b) Observations on Sodium Acetate:
(10) Complete the balanced equations for this reaction:
(a) HC2H3O2(aq) + NaHCO3(s)
(b) H2O(ℓ) + NaC2H3O2(aq) heat
(11) Is reaction 10a above a reaction? ___________ How do you know?
If yes, what type/classification? _____________________________
(12) Is reaction 10b above a reaction? ___________ How do you know?
If yes, what type/classification? _____________________________
III (13) Yes or no (before potato)? ____________
(14) Yes or no (after potato)? ___________________
(15) Observations (signs of a reaction occurring):
(16) Potato is ________________________________
(17) Write the reaction here
(18) Type (classification) of reaction ______________________________________
IV (19) Observations on metal (after reaction)
(20) Write the reaction here
(21) Type (classification) of reaction ______________________________________
\
Answer:
no evidence of how to do the anwsers sorrry.
Explanation:
A typical triple bond ________. Group of answer choices consists of six shared electron pairs consists of two σ bonds and one π bond consists of one σ bond and two π bonds consists of three shared electrons is longer than a single bond
Answer:
One sigma bond and two pi bonds.
Explanation:
Triple covalent bonds between two atoms are created when they share three electron pairs. Three dashes connecting the atoms signify a triple bond. Pnictogen or the nitrogen family of atoms are those having triple valency. The correct option is C.
Two pi bonds and one sigma bond make up a triple bond. One sigma bond and one pi bond make up a double bond. Sigma bonds are usually made up of one atom. A single bond is described as a two-valence electron chemical bond between two atoms.
Covalent bonds with overlapping atomic orbitals fall under the categories of sigma and pi bonds. While pi bonds are created by the lateral overlapping of two atomic orbitals, sigma bonds are created by the head-to-head overlapping of atomic orbitals.
Thus the correct option is C.
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Imma give 35 points cus I really need it today please.
Answer:
yes the picture is not clear
Alpha decay please help (nuclear chemisty)
Explanation:
Given reaction:
¹⁰⁸₅₃I → ⁴₂He + ?
An alpha particle decay requires that the mass number decreases by 4 and atomic number decreases by 2.
This reaction is called nuclear fission;
The unknown compound, say Y, will have mass number and atomic number shown below;
¹⁰⁸₅₃I → ⁴₂He + ᵃₙY
Mass number; 108 = 4 + a
a = 104
Atomic number ;
53 = 2 + n
n = 51
Y will be ¹⁰⁴₅₁Y
The atomic number of the new element is 51; so, it is antimony.
¹⁰⁴₅₁Sb
If 10.0 g of NaF and 15.0 g of HF are dissolved in water to make 2.0 L of solution, what is the pH of the resulting solution?
Answer:
2.68
Explanation:
Step 1: Calculate the molar concentrations of the solutes
We will use the following expression.
M = mass of solute / molar mass of solute × liters of solution
[HF] = 15.0 g / 20.01 g/mol × 2.0 L = 0.37 M
[NaF] = 10.0 g / 41.99 g/mol × 2.0 L = 0.12 M
Step 2: Calculate the pH of the solution
We have a buffer system formed by a weak acid (HF) and its conjugate base (F⁻ coming from NaF). We can calculate the pH of the solution using Henderson-Hasselbach equation.
pH = pKa + log [F⁻]/[HF]
pH = 3.17 + log (0.12 M/0.37 M)
pH = 2.68
The pH of the resulting solution is 2.68.
What is pH?pH is potential hydrogen. It is the measurement of the acidity and basicity of any solution.
Step 1: Calculate the molar concentrations of the solutes
M = mass of solute / molar mass of solute × liters of solution
[tex]\rm [HF] = \dfrac{15.0 g}{20.01 g/mol } \times 2.0 L = 0.37 M[NaF] = \dfrac{10.0 g}{ 41.99 g/mol} \times 2.0 L = 0.12 M[/tex]
Step 2: Calculate the pH of the solution
pH = pKa + log [F⁻]/[HF]
pH = 3.17 + log (0.12 M/0.37 M)
Thus, the pH of the resulting solution is 2.68
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1. A sealed 2500mL flask is filled to capacity with 163g of a slimy green liquid. What is the density of the liquid?
Answer:
0.065 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{163}{2500} \\ = 0.0652[/tex]
We have the final answer as
0.065 g/mLHope this helps you
Answer:
Density= mass/volume so 163/2500 = 0.0652
D= 0.0652
Explanation:
How do u draw an electron dot diagram of an aluminum atom
Answer:
you tell me
Explanation:
When you have a two-layer mixture of water and tert-butyl methyl ether, what physical property of these liquids assures you that the ether is the top layer?
Answer:
The density.
Explanation:
The density is an intensive property of fluids, defined as mass divided by volume.
This property is directly related to the intermolecular forces that are present in the substance: the stronger the intermolecular forces, the higher the density will be, and viceversa. Therefore, organic fluids usually have lower densities than water, because the intermolecular forces in organic fluids are not as strong as in the intermolecular forcer in water (water has very stable hydrogen bonds, whereas organic fluids have van der Waals, weaker than hydrogen bonds).
The liquid that has the lower density will be the the liquid that is on the top layer. In this case, the organic compound tert-butyl methyl ether will be on top of water.
Maalox and Mylanta are both antacids that contain aluminum hydroxide as their active ingredient. Write the balanced equation for the neutralization of hydrochloric acid with aluminum hydroxide, Al(OH)3. Include physical states.
Answer:
3HCl(aq)+Al(OH)3(s)=AlCl3(aq)+3H2O(l)
Explanation:
This is a double replacement reaction.
Step One: Write down the compound from the name.
Aluminum Hydroxide Al(OH)3
Hydrochloric Acid HCL
Step Two: Perform the double replacement reaction.
AB+CD=AD+CB
Step Three: Balance the equation
Final step: Write in physical states.
The physical state will either be (aq), (s), (l) or (g).
The map below shows the range of three types of grasslands in the United
States. What do tallgrass prairies have that shortgrass prairies lack?
23
Blue: Shortgrass prairie
Purple: Mixed grass prairie
Green: Tallgrass prairie
A. Infertile soil
B. Cedar breaks
C. More rainfall
D. Rain shadows
Answer:
More rainfall is the correct answer.
Explanation:
a-pe/x
How do I find the number of moles and molar mass of Gas A and Gas B with the information provided?
Answer:
A.
Explanation:
hope this helped sorry if its wrong!
Density differences in different materials are able to change the of a wave. A)Amplitude B)Crest C)Speed D)Trough
Answer:
C. Speed
Explanation:
Density differences in different materials are able to change the speed of a wave.
Wave speed is dependent on the frequency and wavelength of a wave. As a wave travels from one medium to another, the speed of the wave changes. Speed of a wave is medium dependent. The denser a medium, the slower the speed of waves will be be. A less dense medium will have waves traveling through faster.Answer:
Speed
Explanation:
The speed or mass of something can totally change the direction of the wave
Methanol is an alcohol common to alcoholic beverages but toxic if it contains more than 0.4% how much methanol is present in a 750mL solution?
Answer:
Volume of methanol present in solution = less than 3 ml
Explanation:
Given:
Volume of solution = 750 ml
Find:
Volume of methanol present in solution
Computation:
Volume of methanol present in solution = Volume of solution x 0.4%
Volume of methanol present in solution = 750 ml x 0.4%
Volume of methanol present in solution = 3 ml
Volume of methanol present in solution = less than 3 ml
The amount of methanol present in the 750 mL solution is 3 mL
From the question given above, the following data were obtained:
Percentage of methanol = 0.4%
Volume of solution = 750 mL
Volume of methanol =.?The volume of methanol present in the 750 mL of solution can be obtained as follow:
Volume = Percent × Volume of solution
Volume of methanol = 0.4% × 750
Volume of methanol = 0.004 × 750
Volume of methanol = 3 mLThus, the amount of methanol present in the 750 mL solution is 3 mL
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The diagram below represents the creation of a sugar solution by adding sugar to water then stirring the mixture.
+
SUGAR
WATER
SUGAR SOLUTION
Which of the following is true of this?
The mass of the sugar and water is the same as the mass of the sugar solution
The mass of the sugar and water is greater than the mass of the sugar solution
The mass of the sugar solution is greater than the mass of the sugar and water
We do not have enough information to determine anything about the mass of the sugar, water, or the sugar solution
Answer:
a it is a
Explanation:
cause i know
The creation of a sugar solution by adding sugar to water then stirring the mixture, then the mass of the sugar and water is the same as the mass of the sugar solution.
What is the solution ?A particular kind of homogenous combination made up of two or more components is known as a solution. A solute is a material that has been dissolved in a solvent, which is the other substance in the combination.
A physical process, not a chemical one, takes place when a solute and a solvent combine to produce a solution. When combined, miscible substances like gases form a single phase in all ratios. Phase-separating substances are immiscible.
When one material dissolves, or separates into another, a solution is created. A solute is the name for the material that dissolves to create a solution. A solvent is the material that a solute will dissolve in. Sugar is the solute and water is the solvent in a sugar-water solution.
Thus, option A is correct.
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Which phrase best describes soil?
Answer:
unconsolidated material that contains nutrient matter and weathered rock
Explanation:
Earth's crust is made up of many layers. The top is soil, which provides the most nutrients for plants, like hummus( The organic nutrient for soil, form from the decaying of plants and animals)
The soil gets its texture from the bedrock, the bottom layer, which weathers, and goes into the soil.
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The mass number of a nucleus is the number of: protons nucleons electrons neutrons
protons
there aint rlly an explanation tbh
Answer:
Nucleons
The mass number of a nucleus is the number of protons and neutrons called the nucleons! Nucleons are the sum of protons and neutrons present in the nucleus of an atom.
The Heat of vaporization for NH3= 1360 J/g. Calculate the quantity of heat energy (in kJ)
needed to completely boil a 155 gram sample at its boiling point
general formula
Answer:
[tex]Q=210.8kJ[/tex]
Explanation:
Hello!
In this case, since the heat of vaporization is related with the energy required by a substance to undergo the phase transition from liquid to gas, we can compute such amount of energy as shown below:
[tex]Q=m\Delta H_{vap}[/tex]
In such a way, since the enthalpy of vaporization is given as well as the mass, we compute the energy as shown below:
[tex]Q=155g*1360J/g\\\\Q=210.8kJ[/tex]
Best regards!
ana walked though this part of the forest when she passed under some low branches water drops fell on her head what most likely caused the water drops to form
Answer:
well gravity
Explanation:
gravity pull everything to earth
Identify ammonia. a. strong electrolyte, strong base b. weak electrolyte, strong base c. strong electrolyte, weak base d. nonelectrolyte e. weak electrolyte, weak base
Answer:
Ammonia is a weak electrolyte, weak base.
Option e.
Explanation:
Ammonia can take a proton from water to make ammonium.
It is a base, because it takes proton.
When a compound can take protons, we know that is base, according to Bronsted Lowry theory.
We can't describe ammonia as a base, according to Arrhenius, but we know it is base according to Lewis, because the N from the ammonia can be a donor of its electron pair.
It is weak because an small amount of ammonia, can react to produce ammonium, between the protons of water. This is the equilibrium, where the ammonia is considered as the conjugate strong acid of ammonia.
NH₃ + H₂O ⇄ NH₄⁺ + OH⁻ Kb
All the amines are considered as weak bases, because they look like ammonia, where the H of NH₃ are replaced by others chains.
------NH₂
-----NH-----
__________ is required to make a wave.
Answer:
The moon is required to make a wave.
Calculate the concentrations of H3O(+) and SO4(2-) in a solution prepared by mixing equal volumes of 0.2M HCl and 0.6M H2SO4.
Answer:
[H₃O⁺] = 0.7M
[SO₄²⁻] = 0.3M
Explanation:
The HCl in solution produce 1mole of H₃O⁺ and H₂SO₄ produce 2 moles of H₃O⁺.
When two solutions are mixing in equal volumes, the concentrations of both reactants is halved regard to their initial concentrations. That is:
HCl = 0.1M
H₂SO₄ = 0.3M
And H₃O⁺ will be:
0.1M + 2*0.3M = 0.7M
And SO₄²⁻ comes just from H₂SO₄, that means:
[H₂SO₄] = [SO₄²⁻] = 0.3M
If a wave has a period of 0.25 seconds, what is its frequency?
In which breaker of water will sugar dissolve fastest?
Answer: 90
Explanation: Sugar dissolves faster in hot water than it does in cold water because hot water has more energy than cold water. When water is heated, the molecules gain energy and, thus, move faster. As they move faster, they come into contact with the sugar more often, causing it to dissolve faster.
Answer:
90 c
Explanation:
The sugar dissolve in the hottest bc of the heat it will melt in with the water i an pretty sure
All bacteria contain chromosomes
True
False
Answer:
True,
Explanation:
doesn't have ends like chromosomes of eukaryotic organisms
so all bacteria contains chromosomes yes, 100%
can i have brainliest i need 2 more to get a new rank tysm
A sample of krypton gas collected at a pressure of 1.31 atm and a temperature of 26.0°C is found to occupy a volume of 23.3 liters
Mol of Kr gas = 1.244
Further explanationIn general, the gas equation can be written
PV=nRTwhere
P = pressure, atm
V = volume, liter
n = number of moles
R = gas constant = 0.08205 L.atm / mol K
T = temperature, Kelvin
P=1.31 atm
V=23.3 L
T=26+273=299 K
mol of sample :
[tex]\tt n=\dfrac{PV}{RT}=\dfrac{1.31\times 23.3}{0.08205\times 299}=1.244[/tex]
Which TWO statements describe the ocean floor giving brainliest
Answer:
A & B
Explanation:
Done the Quiz
A carbon nanoparticle (very small particle) contains 8000 carbon atoms. According to the Einstein model of a solid, how many oscillators are in this block?
Answer:
24000
Explanation:
Given that:
The numbers of carbon atoms = 8000
According to the Einstein model of solid;
Einstein’s model assumes that each atom of the solid vibrates around its position of equilibrium independently of the other atoms (which amounts to neglecting the interactions between particles.
Number of oscillators = 3(8000)
Number of oscillators = 24000
The number of oscillators contained in the carbon nanoparticle is therefore: 24,000
Discussion:
Einstein model of solid postulation is as follows;
The model is characterized by an assumption that each atom of the solid vibrates around its position of equilibrium independently of the other atoms (which amounts to neglecting the interactions between particles).
In essence, the interaction between particles is ignored.
Since each atom vibrates in 3 dimensional directions;
The number of oscillators in the carbon nanoparticle containing 8000 carbon atoms is therefore; 3 × 8000 = 24,000 oscillators.
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