Answer:
which is an example of analog device
Due to the reaction's slow process of producing ppt or a change in color.
What is chemical reaction?Chemical reaction is defined as a procedure where one or more compounds, known as reactants, are changed into one or more new substances, known as products. Chemical reactions result in the formation of new chemical bonds between the atoms of the reactant molecules and the product particles' atoms. While there are the same number of atoms both before and after the chemical transition, there will be a change in the number of molecules.
When carbon dioxide and water combine, carbonic acid is created. The indicator changes color as a result of the water becoming slightly acidic due to carbon dioxide gas from exhaled breath. Dissolution causes a change in pressure. This suggests a physical alteration.
Thus, due to the reaction's slow process of producing ppt or a change in color.
To learn more about chemical reaction, refer to the link below:
https://brainly.com/question/29039149
#SPJ2
What is the IUPAC name of the following compounds i. CO₂ ii. NO₂ iii. HNO3 iv. H₂SO4 v. K-Cr₂O vi. [Fe(CN)
Explanation:
I) carbon dioxide
ii) nitrogen dioxide
iii) nitric acid
iv) sulphric acid
v) Potassium dichromate
vi) hexacyanoferrate (III) ion( not sure)
Need answer asap!! Molecules in the solid state
A) transfer heat to neighboring molecules by convection
B) have no motion
C) have no internal energy
D) vibrate in fixed positions
Answer:
c, have no internal energy
Select two that are true
Answer:
The two that are true are, "this represents a pure compound in two different states" and "it represents a mixture a solid and a gas".
Explanation:
This two are concluded only from the picture and the use of uniform colors throughout the picture (Showing the same element).
Is XeCl4 a molecular compound?
Answer:
Hint for Naming XeCl4
We have two non-metals so this is a molecular (sometimes called covalent) compound.
What is the pH of a 8.4x10⁻6 M H+solution?
What is pH?
pH=[?]
The pH can be obtained directly from the concentration using the formula below pH = - log [H⁺] Hence, pH of a 8.4x10⁻⁶ M H⁺ solution is 5.08.
What is pH ?
A figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline.
Taking the negative logarithm of the concentration of hydronium ions that are in the solution:
pH = - log [H⁺]
= - log [8.4x10⁻⁶ ]
= 5.08
Hence, pH of a 8.4x10⁻⁶ M H⁺ solution is 5.08.
Learn more about pH here;
https://brainly.com/question/12294404
#SPJ1
-You wish to make a 0.203 M hydrochloric acid solution from a stock solution of 6.00 M hydrochloric acid. How much concentrated acid must you add to obtain a total volume of 175 mL of the dilute solution?
mL
-In the laboratory, a student dilutes 20.3 mL of a 8.20 M hydrochloric acid solution to a total volume of 200.0 mL. What is the concentration of the diluted solution?
Concentration =
M
-How many milliliters of 9.36 M perchloric acid solution should be used to prepare 1.50 L of 0.700 M ?
mL
For all three questions, we will use the fact that
molarity = (moles of solute)/(liters of solution)1) For 175 mL of solution at 0.203 M, this means that:
0.203 = (moles of solute)/0.175moles of solute = 0.035523 molConsidering the hydrochloric acid solution, if we have 0.035523 mol, then:
6.00 = 0.035523/(liters of solution)liters of solution = 0.035523/6.00 = 0.0059205 = 5.92 mL (to 3 sf)2) If there is 20.3 mL = 0.0203 L, then:
8.20 = (moles of solute)/0.0203moles of solute = 0.16646 molThis means that the molarity of the diluted solution is:
0.16646/(0.200) = 0.832 M (to 3 sf)3) If we need 1.50 L of 0.700 M solution, then:
0.700 = (moles of solute)/1.50moles of solute = 1.05 molConsidering the 9.36 M acid solution, from which we need 1.05 mol of perchloric acid from,
9.36 = 1.05/(liters of solution)liters of solution = 1.05/9.36, which is 0.11217948717949 L, or 112 mL (to 3 sf)someone people help me with this chemistry question
Answer:
6 moles
Explanation:
From the equation you can see that twice as many HCL moles are used as H2 produced
2 x 3 = 6 moles of HCL required
Felicity lists the factors that affect the shape of Florida.
Which does not belong in this list?
Answer:
if the Florida inters into the land se hokar gar ke bill Tak jane ke process Florida kahte hai aur bur ka bal se doodh chusne Tak wo Florida s
Humidity, thermometer, and rainfall factors affect the shape of Florida, making the shape different.
What is the shape of Florida?In general, a molecule's electron pairs will take on a structure that maximizes theirs from one another.
Even charges repel one another, whereas dissimilar charges attract H₂O, for instance, containing two pairs of lone electrons but taking on an angular form.
Sand ridges, like the Lake Wales Ridge, were created during dry times from sediments that had been transported by ocean currents and deposited to form islands.
Latitude, land and water distribution, dominant winds, hurricanes, pressure systems, and ocean currents are the main variables that influence Florida's climate.
Therefore, as glaciers retreated throughout cooling cycles, sea levels dropped and Florida occasionally doubled in size.
Learn more about Florida, here:
https://brainly.com/question/12732190
#SPJ2
Please show steps Thanks
Answer:
chuma ya ndoshi.............
Explanation:
.
kwenda ukalale .............
What is the SI unit used to measure weight?
Answer:
The si unit used to measure weight is kilogram /kg
Which of the following is the best example of an isolated system?
OA. A bus at a bus station
B. An astronaut in a spaceship
OC. A car on the freeway
D. A motorcycle in a garage
Answer:
B. An astronaut in a spaceship
Isolated system :-
In an isolated system, there is no transfer of energy or matter between the system and the environment.
Hope it helps!
Indicate the number of significant figures in the following measured numbers:
a. 45 = __________
f. 980.00 = __________
b. 450 = __________
g. 740000 = __________
c. 0.0045 = __________
h. 0.00000042 = __________
d. 3006 = __________
i. 4050600 = __________
e. 0.00780 = __________
j. 230.0050 = __________
Answer: a = 2 ; f = 5 ; b = 2 ; g = 2 ; c = 2 ; h = 2 ; d = 4 ; i = 5 ; e = 3 ; j = 7
Explanation: Some rules to follow while calculating sig figs is
1. If a number like 4500 is present, only two sig figs are counted, but none of the zeros are, but if 4500. has a decimal point present, then you should count all the numbers available.
2. If a number like .0005 is present, only count 5 as a sig fig, however if the number is .00050, count the 0 after the 5 in this example (this would then have two sig figs.
Although these days many people have “self-cleaning” ovens, if your oven gets really dirty you may have to resort to one of the spray-on oven cleaner preparations sold in supermarkets. What evidence is there that such oven cleaners work by a chemical reaction?
Oven cleaners typically contain a layer of sodium hydroxide, which converts the greases and oils on the oven walls into soap, which can then be cleaned away more easily.
What is an oven?A chamber used for baking, heating, or drying.
Self-cleaning ovens emit dangerous fumes into the air with an unpleasant burning smell. Self-cleaning ovens reach high temperatures and produce fumes from the cooking of food particles. These fumes circulate with the air and can affect the home substances.
Spray-on oven cleaner ovens contain a layer (sodium hydroxide), which converts the greases of the oven walls into soap, which can then be cleaned away more easily.
Learn more about ovens here:
https://brainly.com/question/1226361
#SPJ1
Can you help me with this with a solution
The complete table is inserted.
A table is given,
Formulas used:
pH= -log(H⁺)
pOH= -log(OH⁻)
pH+ pOH=14
Calculations:
For A: (H⁺)=2×10⁻⁸M
Using the pH formula:
pH= -log(H⁺)=-log(2×10⁻⁸)=7.69
pOH=14 - 7.69=6.3
Calculating OH concentration,
pOH= -log(OH⁻)
6.3= -log(OH⁻)
(OH⁻)=5.011×10⁻⁷M
Hence, the nature of A is basic.
Similarily,
For B,
(OH⁻)=1×10⁻⁷
Using the pH formula:
pOH= -log(OH⁻)= -log(1×10⁻⁷)=7
pH=14-7=7
Calculating H concentration,
pH= -log(H⁺)
7= -log(H⁺)
(H⁺)=1×10⁻⁷M
Hence, the nature of B is neutral.
Similarily,
For C,
pH=12.3
Using the pH formula:
pOH=14-12.3=1.7
Calculating H concentration,
pH= -log(H⁺)
12.3= -log(H⁺)
(H⁺)=5.011×10⁻¹³M
Calculating OH concentration,
pOH= -log(OH⁻)
1.7= -log(OH⁻)
(OH⁻)=1.99×10⁻²M
Hence, the nature of C is Basic.
Similarily,
For D,
pOH=6.8
Using the pH formula:
pH=14-6.8=7.2
Calculating H concentration,
pH= -log(H⁺)
7.2= -log(H⁺)
(H⁺)=6.309×10⁻⁸M
Calculating OH concentration,
pOH= -log(OH⁻)
6.8= -log(OH⁻)
(OH⁻)=1.58×10⁻⁷M
Hence, the nature of D is basic.
Learn more about the acid and bases here:
https://brainly.com/question/16189013
#SPJ10
b. Describe hydrogen bonding. (1 point)
Using a table of standard electrode potentials, label each of the following statements as completely
true or false.
A) Cu²+ can oxidize H2, and Fe can reduce Mn²+
B) Ni²+ can oxidize Cu²+, and Fe²+ can reduce H+
C) Fe²+ can oxidize H₂, and Fe²+ can reduce Au³+.
D) Br₂ can oxidize Ni, and H₂ can reduce Mn²+
E) H* can oxidize Fe, and Ni can reduce Br₂
Answer: B and E are True
Explanation:
Because Fe has a higher oxidation potential than H2, H+ can oxidize it.
[tex]$\begin{array}{llllll}\mathrm{Fe} & \rightarrow & \mathrm{Fe}^{2+} & +2 \mathrm{e}- & \mathrm{E}^{0}=0.44 \mathrm{~V} \\ \mathrm{H} & \rightarrow & \mathrm{H}^{+} & + & \mathrm{e}^{-} & \mathrm{E}^{0}=0 \mathrm{~V}\end{array}$[/tex]
Ni can reduce Br2 because the reduction potential of Ni is more than Br2.
[tex]\mathrm{Ni}^{2+}+2 \mathrm{e}^{-} \rightarrow \mathrm{Ni}^{-} \quad \mathrm{E}^{0}=-0.25 \mathrm{~V}\\2 \mathrm{Br}^{-} \quad \rightarrow \mathrm{Br}_{2}+2 \mathrm{e}^{-} \quad \mathrm{E}^{0}=-1.087 \mathrm{~V}$[/tex]
light frequency 1.40x10^15 Hz strike a surface causing photoelectrons to leave with a KE of 1.05 eV what is the work function in eV
Answer:
The Work Function is 4.74eV.
Explanation:
The photoelectric effect is a phenomenon in which a beam of light is projected towards a metal plate and this leads to the ejection of electrons from the metal. The minimum amount of energy required for this ejection of electrons is known as the work function. When the energy of the light beam is less than the work function, then the electrons are not emitted.
The photoelectric effect is represented by the equation:
E = φ + KE where
E = energy of the incident photons
KE = kinetic energy of photoelectrons
φ = Work function of the metal
This can also be written in terms of frequency as:
h = h₀ + [tex]\frac{1}{2}[/tex] mv²
= frequency of the incident light beam
₀ = frequency of the photoelectrons
m = mass of the electron
v = velocity of the electron
h = Plank's constant 6.623 x 10⁻³⁴Js
Conversion factor: 1eV = 1.602 x 10⁻¹⁹ J
So, 1.05eV = 1.682 10⁻¹⁹ J
Using the formulas,
(6.623 x 10⁻³⁴Js)(1.40x10¹⁵ s⁻¹) = φ + 1.682 x 10⁻¹⁹ J
(9.272 x 10⁻¹⁹) - (1.682 x 10⁻¹⁹) = φ
φ = 7.590 x 10⁻¹⁹ J = 4.74 eV
Learn more about work function here:
https://brainly.com/question/9757301
#SPJ2
Pyroxene and Olivine are two minerals formed by the cooling of lava, whereas quartz and feldspar are formed as magma cools.
a. Based on the way they form, which two minerals will be comparatively bigger in size?
b. Why? Provide scientific evidence to support your answer
Quartz and Feldspar will be comparatively larger in size since they are formed from cooling of magma while Pyroxene and Olivine are formed by the cooling of lava.
What is the difference between magma and Lava?Magma is molten rock that is found deep within the earth's crust whereas Lava is molten rocks that comes up and flows on the earth's surface.
Minerals formed from magma and lava have comparatively different sizes.
Minerals formed from magma are larger in size than minerals formed from Lava. This is because minerals formed from magma undergo slower cooling, and thus, have a longer time to grow in size. However, minerals formed from lava have a relatively shorter cooling time and do not grow into very large sizes.
Therefore, Quartz and Feldspar will be comparatively larger in size since they are formed from cooling of magma while Pyroxene and Olivine are formed by the cooling of lava.
Learn more about magma and lava at: https://brainly.com/question/14886424
#SPJ1
why is it important to convert currency units from one type to another chemistry
easy to compare
easy in calculation
adjust to units commonly used in certain places
Describe the subatomic structure of the nucleus, including the structure of each nucleon. Draw a picture. Describe the forces that hold the nucleus together and draw them on your diagram. Explain how beta emission works.
The nucleus of the atom is the heaviest part of the atom.
The nucleus consists of neutrons and protonsBoth neutrons and protons have masses, but only protons have chargesThe nucleus contains all the positive charges of an atomThe mass of an atom is the sum of the numbers of protons and neutrons in a nucleusWhen the ratio of neutrons to protons is too high, the nucleus becomes unstable and Beta emission has to take place.
In beta emission, an extra neutron gives rise to a proton and an electronThe electron is ejected from the nucleusLearn more about beta emission here:
https://brainly.com/question/4184205
#SPJ10
a 20.0mL sample of 0.15M hydrochloric acid (HCI) is needed to neutralize a 10.0mL sample of potassium hydroxide (KOH). what is the molarity of KOH solution?
Answer: .75 M
Explanation:
Identify bond types as either ionic, metallic or covalent
HCN
Fe
PbO
Si
Answer:
In ionic bond one element should be metal and next should be non metal. in covalent both element should be met Alice. if there valence electron is less than 4 than it is metal or more than 4 it is non metal.
Why barbituric acid in name of acid
what is the relationship of work with distance and the force?
The good answer will be marked as brainlist.....
Answer:
Work is the use of force to move an object. It is directly related to both the force applied to the object and the distance the object moves. Work can be calculated with this equation: Work = Force x Distance.
:)
HELP! ASAP!
2. What is the role of activation energy in a chemical reaction? Using your understanding of activation energy, explain why a piece of paper sitting in a 70° F room does not ignite/burn/react even though there is plenty of oxygen to go around (the cellulose of paper can react with oxygen to form carbon dioxide and water).
Activation energy is required so reactants can move together, overcome forces of repulsion, and start breaking bonds.
What is activation energy?The minimum amount of energy that is needed to activate atoms or molecules to a condition in which they can undergo a chemical transformation or physical transport.
The activation energy of this chemical reaction is high that it will not start at room temperature. This is why a source of heat is required to start the fire: the “energy barrier” must be overcome before the reaction can proceed further.
In any chemical reaction, existing chemical bonds should be broken before new bonds formation. The breaking of chemical bonds requires an input of energy. In some reactions, the thermal energy at room temperature is enough to break the bonds.
In other cases, the thermal energy at room temperature does NOT give enough energy to break the needed bonds (by facilitating sufficiently energetic molecular collisions) to get the reaction started.
Learn more about activation energy here:
https://brainly.com/question/11334504
#SPJ1
Determine the number of protons, neutrons, and electrons in the following:
40
. . X
18
Ignore the dots im just trying to place the element over between the numbers
The ⁴⁰₁₈X is the symbol for ⁴⁰₁₈Ar - atom and it has 18 protons, 18 electrons, and 22 neutrons.
What is Mass number ?Mass number is the sum of the numbers of protons and neutrons present in the nucleus of an atom.
In the given element, ⁴⁰₁₈X, Subscript 18 is the number of proton and is also equal to the number of electron. While supercript 40 is the atomic mass.
The number of neutrons is given by subtracting the proton number from the mass number.
Therefore,
Number of Neutron = Mass Number - Atomic Number
= 40 - 18
= 22 Neutrons
Learn more about Mass number here ;
https://brainly.com/question/18803094
#SPJ1
How many valence electrons will a Cl- ion have?
Answer:
8
Explanation:
im pretty sure it'll be 8 electrons
Which option below has the correct order of steps to complete a stoichiometric calculation to determine percent yield?
A. Write a balanced equation, determine the limiting reactant, calculate the theoretical yield, calculate the percent yield
B. Write a balanced equation, determine the excess reactant, calculate the theoretical yield, calculate the percent yield
C. Determine the excess reactant, write a balanced equation, calculate the theoretical yield, calculate the percent yield
D. Calculate the percent yield, determine the limiting reactant, write a balanced equation, calculate the theoretical yield
To determine the percentage yield, do the following:
Write the balance equationDetermine the limiting reactant Calculate the theoretical yieldCalculate the percentage yield (Option A)What is stoichiometry?Stoichiometry simply defined the relationships of the various quantities as they react in a chemical reaction
Scientist are mostly inquisitive and as such may want to determine the percentage yield of a reaction even before carrying it out.
How to determine the percentage yieldTo determine the percentage for a given reaction, we must set up the following:
Write the balance equationDetermine the limiting reactant Calculate the theoretical yieldCalculate the percentage yieldFrom the above, we can conclude that option A gives the right steps if we must successfully determine the percentage yield of a reaction.
Learn more about stoichiometry:
https://brainly.com/question/14735801
#SPJ6
Answer:
A
Explanation:
Edge 2022
What happens to a 8 L volume of gas as you love a pressure of 3 atm to 4 atm? Use the correct gas law to determine the new volume
Assuming pressure is held constant,
[tex]\frac{8}{3}=\frac{V_{2}}{4}\\\\V_{2}=4\left(\frac{8}{3} \right) \approx \boxed{10.7 \text{ L}}[/tex]
Calculate the pH of a solution with [H+] = 2.52 x 10^-5.
Answer:
pH = 4.6
Explanation:
pH is the negative of the log of the hydrogen ion concentration
- log { 2.52 x 10^-5) = ~ 4.6
