Answer:
20cm^2
Explanation:
Here, Density= Mass/ Volume
=100/5
= 20 cm^2
The predicted yield for a reaction was 10g of product. If the percentage yield for this reaction was 50%, how much product was formed?
The quantity of the product that was formed was 5g
From the question,
We are to determine the quantity of product formed. That is, the actual yield.
Using the formula
[tex]Percentage \ yield =\frac{Actual \ yield}{Theoretical\ yield} \times 100\%[/tex]
From the given information
Theoretical yield = 10g
Percentage yield = 50%
Putting the parameters into the formula, we get
[tex]50\% = \frac{Actual\ yield}{10} \times 100\%[/tex]
Then,
[tex]50\% = Actual\ yield \times 10\%[/tex]
∴ Actual yield = [tex]\frac{50\%}{10\%}[/tex]
Actual yield = 5g
Hence, the quantity of the product that was formed was 5g
Learn more here: https://brainly.com/question/17127987
in a petri dish, a certain type of bacterium doubles in number every 30 minutes. there were originally 16, or 2^4, bacteria in the dish. after 150 minutes, the number of bacteria has doubled 7 times, multiplying by 2^7. Now the population of bacteria is 2^4 • 2^7. Expressed as a power, how many bacteria are in the petri dish after 150 minutes? A. 2^28 B. 2^11 C.4^11 D.2^7
Answer:
D
Explanation:
Answer:
its not D it's B trust me
Explanation:
What is the correct formula for tetraphosphorous octaoxide
P4O10
P4O8
Ph4O8
P5O8
P_4O_8
How?
Let's learn how to create name of compound from its name.
Look below for root words
2-di 3-tri4-tetra5-pent6-hex7-hept8-oct9-non10-decHence formula of the compound is P4O8
why does reducing solute particle size increase the speed at which the solute dissolves in water .
Because it has less surface area. This can be applied to something like cooking potatoes. Cooking a larger potato will take longer than a small potato.
(only the rght letter and a explanation you don't really need the explanation ill give brainiest)
What happens when an electrically charged pencil is placed close to water running from a faucet?
A. The pencil attracts the water.
B. The pencil becomes positively charged.
C. The water attracts the pencil.
D. The water repels the pencil.
Answer:
Explanation:
Option c) The water attracts the pencil.
Pencils are though formed of wood that acts as a bad conductor of electricity, quite strangely pencils can be electrically charged.
Here pencils have non-metal carbons present in its graphite tip and this makes the pencils charged.
When this pencil is held near the water of the tap, the hydrogen ions get attracted and thereby the water gets attracted to the pencil.
Water, however, is an excellent conductor of electricity and therefore water and electricity are a dangerous combination.
You have a sealed 2 liter flask that contains nothing but water and carbon dioxide. The flask is half-filled with liquid water, has a temperature of 25°c, and the overall pressure within the flask is 0. 1 atm. How many moles of co2 are in the flask? at this temperature, you may take the kh value for co2 as 0. 033 m / atm.
In this exercise we want to calculate the amount of moles, so this is going to be:
[tex](4.6)(10^{-3}) \ mols \ CO_2[/tex]
Knowing that Henry's law is given by:
[tex]C = KHP[/tex]
Where constants are given by:
C = Concentration KH = Henry's law constant = [tex]0.033 m/atm[/tex]P = partial pressure = [tex]0.07 atm[/tex]Before we can find the concentration of CO2 (and hence the moles of CO2), we first need to find its partial pressure. We look up the vapor pressure of water at 25º and find it to be 0.03 atm. Since the total pressure is equal to 0.1 atm, this mean the partial pressure of:
[tex]CO_2 = 0.1 \ atm - 0.03 \ atm = 0.07 \ atm[/tex]
Now using Henry's law, we find the concentration:
[tex]C = (0.033)*( 0.07) = (2.31)*(10^{-3})[/tex]
Converting to moles of CO2, we have:
[tex](2.31)*(10^{-3})*( 2) = (4.6)*(10^{-3})[/tex]
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Part 1. After learning about the different parts and functions of a meroscope you will now reflect on the importance of ench part citeit significance of each parts by naming it and answering the guide question
Explanation:
after learning more about the position and would
What is the unabbreviated electron configuration for Barium?
Answer:
[Xe] 6s2
Explanation:
hope it helps Electron configuration
How do mixtures differ from substances?
Answer:
In chemistry: a pure substance consists only of one element or one compound. a mixture consists of two or more different substances, not chemically joined together.
Hope this helps :)
What is the molar mass of an unknown gas with a density of 3.35 g/L at 1.00 atm and 25.0 °C
Answer:
[tex]\implies \sf D = \dfrac{PM}{RT}[/tex]
[tex]\implies \sf 3.35= \dfrac{1 \times M}{ \frac{1}{12} \times 298}[/tex]
[tex]\implies \sf 3.35= \dfrac{12\times M}{ 298}[/tex]
[tex]\implies \sf 3.35 \times 298= 12\times M[/tex]
[tex]\implies \sf 998.3= 12\times M[/tex]
[tex]\implies \sf M = \dfrac{998.3}{12} [/tex]
[tex]\implies \bf M = 83.1917 \: \frac{g}{mol} [/tex]
what is the periodic trend for electronegativity
Answer:
mark me brainlest
Explanation:
Electronegativity values generally increase from left to right across the periodic table. Electronegativities generally decrease from top to bottom of a group. The highest electronegativity value is for fluorine.
Answer:
"Electronegativity increases as you move from left to right across a period because the number of charges on the nucleus increases." (sstudy30 on Quizlet)
Explanation:
It explains itself haha!
Have a nice day!
I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)
- Heather
PLEASE HELP IM DESPERATE.
Assume you are performing the calibration step of Experiment 8 and you begin with 80 g of water at 20 oC and 80 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment, you determine the temperature of the mixed portions of water to be 45 oC. What is the heat capacity of the calorimeter?
Assume room temperature is 25 oC.
Answer:
Reaction time tests can be used to assess an individual's hand-eye coordination. One test involves catching a 1 metre ruler and measuring the distance, d in metres, that the ruler travelled before being caught. The reaction time t seconds is then calculated using the formula: = √2d/9.8
Give 2 reason why cryolite is used
Melting point of 20 g of ice
Answer:
6680 J
Explanation:
Find the number of CO2 molecules present in 20l of CO2 at 0°C and 772mm of Hg.
I wiLL mark you as brainliest and give 50 points.
Answer:
18
At STP, 22.4 liters of a gas forms one mole that is 6.023×10
23
molecules.
Volume of CO
2
in 1 litre of air =
100
0.03
×1 L
∴ No. of molecules of CO
2
=
22.4
6.023×10
23
×
100
0.03
=8.066×10
18
Explanation:
I guess it's this
[tex]\\ \sf\longmapsto PV=nRT[/tex]
[tex]\\ \sf\longmapsto n=\dfrac{PV}{RT}[/tex]
[tex]\\ \sf\longmapsto n=\dfrac{772(20)}{8.314(273)}[/tex]
[tex]\\ \sf\longmapsto n=\dfrac{15440}{2269.722}[/tex]
[tex]\\ \sf\longmapsto n=6.8mol[/tex]
Add 2 teaspoons of baking soda and 2 teaspoons of citric acid to the foam cup. Add the half cup of water to the cup and stir. What is the temperature?
Answer:
Test for carbon dioxide gas.
The reaction between baking soda and citric acid will form sodium ions, citric acid ions, carbon dioxide gas, and water. So all you have to do is add the gas produced (by gas displacement method or something) and test whether the gas is carbon dioxide, with lime water or other methods like hydrogencarbonate indicator. Hope this helped!
Explanation:
Answer:
depends on amount, but the reaction's endothermic (meaning its cold, absorbs heat from surroundings)
I hope it helps.
Which of the following is NOT a conductor of heat?
A. a plastic pot handle
B. a copper pan
C. a metal spoon
A) A plastic pot handle.
Explanation:Metals are very good conductors of heat because they contain delocalised electrons that can flow through the metal, transferring heat.
Both a copper pan and a metal spoon are made of metals, so are very good conductors of heat.
Plastic is an insulator, the opposite of a conductor. This makes it very bad at conducting heat, which is why it is used as the handle (it stops you burning yourself when you hold the pot). The answer is therefore A.
pls help! Two galaxies on opposite ends of the universe are moving away from the Earth. Each has a velocity of 200,000 km/s relative to the Earth. How fast would an observer in one of those galaxies see the other galaxy moving away?
A.200,000 km/s
B. between 300,000 and 400,000 km/s
c. between 200,000 and 300,000 km/s
D. 400,000 km/s
An observer in one of those galaxies see the other galaxy moving away at 400000 km/s.
Relative velocity is the velocity of an object with respect to another object, that is the time rate of change of relative position of one object with respect to another object.
Since two galaxy are moving in opposite directions with a velocity of 200,000 km/s. Hence the relative velocity between the two galaxies is 400000 km/s (200000 + 200000)
Therefore an observer in one of those galaxies see the other galaxy moving away at 400000 km/s.
Find out more at: https://brainly.com/question/12846122
Answer:
D 400,000km/s
Explanation:
How does a cation attract an anion?
An ionic bond is formed through the transfer of one or more valence electrons, typically from a metal to a non-metal, which produces a cation and an anion that are bound together by an attractive electrostatic force.
the Periodic Table •
Class
Key Terms
Key Terms Ch. 4
Use the clues to help you unscramble the Key Terms from the chapter. Then put the
numbered letters in order to find the answer to the riddle.
Clues
Key Terms
1. A fast-moving electron
given off by a nucleus
during radioactive decay. tbaerlpiaect
2. A term used to describe a
material that can be pounded
into shape
llbeealam
3. The process of oxygen
reacting with a metal to
form rust
4. A particle in the atomic
nucleus that carries no
charge
5. A horizontal row across the
2
rsoooiner
3
ouetnrn
periodic table
roiedp
6. Substance that can only
6
conduct electric current
under certain circumstances. otmidsceuncro
7
7. A term used to describe a
material that can be drawn
into a long wire
lecuitd
8 9
8. Radioactive isotope that can be
followed through a chemical
reaction or an industrial
process
aerrtc
9. The elements in Group 18
of the periodic table
nreti ssgea
11 12
10. The very small center core
of an atom
13
10
cuunsle
Riddle: What chart shows the repeating properties of elements?
Answer:
1 2 3 4 5 6 7 8 9 10 11 12 13
Answer:
your question too long did not read all
Explanation:
Solutions
Which statement is true of pure substance
1. They may contain one type of atom or one type of molecules.
2.they can only contain one type of molecules.
3.they can contain different types of atoms and molecules.
4.they can only contain one type of atom
This is science btw
Answer:
4
Explanation:
cuz pure substance contain one type of atom,molecule,or cpd.
2 is true but it have wrong grammar,if it contain only one type it must be^^molecule^^
Why do metals form cations and nonmetals form anions?
[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
Metals have tendency to loose electrons in order to get noble gas configuration, therefore they loose electrons to form Cations (positively charged ions)
for example ~ Sodium forms Na+
And
Non - metals have tendency to gain electrons in order to attain noble gas configuration , hence they gain electron from somewhere and bears a negative charge forming Anion.
for example ~ Chlorine forms Cl-
Helium (he) has two valence electrons, and these electrons are located in the 1s subshell. Without using the periodic table, in which group and period is helium located?.
helium is in group 8 and period 1
T or F: Lone pairs around the oxygen atom of a water molecule play no role in determining its molecular geometry?
Answer:
Explanation:
They play a very important part. The geometry is not a straight line. It is an angle over 90 which means that the molecule has the same general shape as a boomerang. The two hydrogens and the 2 lone electron pairs try to get away as far as possible from each other. The actual shape results in a tetrahedron shape. But the two hydrogens and 1 oxygen actually look like the aforementioned boomerang.
How does acid base extraction work.
Answer:
it can be done using the method of lithium paper
Joe the scientist wants to figure out if the weight of a bowling ball will affect how fast it rolls down a ramp. Joe builds a 15 foot long ramp that is 5 feet tall at the top. Joe believes that if he rolls the 6 pound bowling ball from the top of the ramp, then it will roll the fastest. Joe then gets several bowling balls that are identical except for their weight. The different weights are 6 pounds, 8 pounds, 10 pounds, 12 pounds, and 14 pounds. Joe starts by placing the 6 pound ball at the top of the ramp and he starts the timer at the same time he lets go. He stops the timer when the ball reaches the bottom of the ramp. Joe repeats this process for all of the bowling balls. Joe repeats this process for all of the bowling balls.
What’s the IV, DV, hypothesis and constant ?
Answer:
IV: The weight of the ball
DV: Time it takes for the ball to roll from top to bottom
Hypothesis: 6 pound bowling ball from the top of the ramp, then it will roll the fastest.
Constant: I dont know
Explanation:
what element is 1s2 2s2 2p3
In a few minutes, you will work with your partner to create three dances—one for each of the three phases. Each dance will represent the molecular freedom of movement of that particular phase.
If needed, navigate back to My Work to refer to your homework from Lesson 1.4. Then, begin brainstorming ideas for movements that would show these phases.
Dance ideas for solids:
Dance ideas for liquids:
Dance ideas for gases:
Water (H2O) is a liquid at room temperature, while carbon dioxide (CO2) is a gas at room temperature. Why? Choose the two statements that apply.
Water has relatively strong hydrogen bonds holding the molecules together but CO2 has only dispersion forces acting as intermolecular forces. The weaker intermolecular forces explains why CO2 is a gas whereas H2O is a liquid at room temperature
What do each of the' rings represent in the Bohr models?
Answer:
The energy levels or electron shells of an atom.
Answer:
Each ring represents a different energy level for the electrons. Each ring has a maximum number of electrons that it can hold. The first (inner) ring can only hold two electrons, the second level can hold eight, the third can hold 18 and the fourth holds 32.
Hope this helps :)
