Answer: 50 nm
Explanation: Two steps:
1. Divide 3.25/6.5 = 0.5
2. Divide 10^8/10^6 = 10^2
nm^2/nm = nm
Combine: 0.5x10^2 nm
or 50 nm
2. What do you think may have happened to the "bad" chocolate bar? Do you think
it was made poorly? Or do you think something happened to the chocolate on the
way to the customer? Also, is there a way Charlotte can avoid this issue in the future?
Explain.
Answer:
2
Explanation:
Could any one help on this fill in questions
What did Ernest Rutherford’s gold foil experiment demonstrate about an atom?
Each atom is composed of electrons and positive material.
The mass of the atom is evenly spread throughout the atom.
Neutrons are located in the center of the atom.
Positive charge occupies a very small volume in the atom.
Answer:
I believe its the last one
Explanation:
The gold-foil experiment showed that the atom consists of a small, massive, positively charged nucleus with the negatively charged electrons being at a great distance from the centre. Niels Bohr built upon Rutherford's model to make his own.
A ___________
is a process that occurs when
one or more substances are changed into one or more new
substances. For example, when zinc and sulfur are mixed
together with the addition of energy in the form of heat, zinc
sulfide (ZnS) is produced.
Answer:
Reaction??
Explanation:
You decide to clean the bathroom. You notice that the shower is covered in a strange green slime. You decide to try to get rid of this slime by adding lemonade juice. You spray half of the shower with lemonade juice and spray the other half of the shower with water. After 3 days of spraying equal amounts 3 times a day, there is no change in the appearance of the green slime on either side of the shower. How many trials are being performed in this example?
Answer:
3
Explanation:
Can someone please help me
(1) One night while looking through his telescope,
Reginald saw three planets in the sky. X, Y. and
Z. X was smaller than Y, and Y was smaller than Z.
Was Z larger or smaller than X?
Answer:
Z was smaller than X
Explanation:
if X<Y and Y<Z
therefore X<Z
An isotope of hydrogen commonly referred to as heavy water is
Answer:
Heavy water is a compound that is made up of oxygen and deuterium, a heavier isotope of hydrogen which is denoted by ‘ 2 H’ or ‘D’. Heavy water is also called deuterium oxide and is denoted by the chemical formula D 2 O.
Density: 1.107 g/mL
Dipole moment: 1.87 D
Heavy Water (Deuterium Oxide): D2O
Molecular Mass: 20.02 grams/mole
Explanation:
Which one of the give elements the least reactive?
A. Fluorine
B. Chlorine
C. Iodine
D. Bromine
Answer:
c
Explanation:
iodine is the answer.please mark me as brianlist.
Answer:
Fluorine
Explanation:
It is the most reactive
Calculate the mass of a solid metal cylinder with a density of 2.6 g/cm", a
diameter of 1.8 cm, and a length of 4 cm.
Answer:
V= π ×r² × h
V = 3.14 × (0.9)² × 4
V = 3.14 × 0.81 × 4
V = 10.1736
Mass = Volume × density
M = 10.1736 × 2.6
M = 26.45136 g
Write the reaction to prepare C2H5Br from (image attached)
a) alcohol using PX3
b) Alcohol using HX
The equations for the preparation of C₂H₅Br from alcohol using PX₃ and HX are shown in the attachment below.
a) Preparation of C₂H₅Br from alcohol using PX₃
In PX₃, X refers to the halides (F, Cl, Br etc.). Since the desired ethyl halide is ethyl bromide (C₂H₅Br) , then X in PX₃ will be Br. Therefore, PBr₃ will be used in the reaction as shown in the attachment below.
b) Preparation of C₂H₅Br from alcohol using HX
Also, In HX, X refers to the halides (F, Cl, Br etc.). Since the desired ethyl halide is ethyl bromide (C₂H₅Br), then X in HX will be Br. Therefore, HBr will be used in the reaction as shown in the attachment below.
Learn more here: https://brainly.com/question/21780261
How to separate thumb tacks and plastic beads?
How to separate color components of a leaf?
Explanation:
Add ethanol ( or whichever you choose) into the mixture.
Use a filter to separate the salt from mix.
Evaporate the ethanol/petroleum spirit -sugar mix to get the sugar by itself.
Done!
Answer: 1) a) Use a magnet, or b) add to water abd scoop off the floating plastic beads
2) Grind the leaf and solubilize what you can in water, then use filter paper as a chromatograph to separate the colors.
Explanation:
1) Look for any property between the two substances that has a large enough difference to provide an avenue for separation. Density is good, particle size also can be used, solubility, and magnetic properties, among others.
2) https://www.britannica.com/science/paper-chromatography
At the end of an experiment, a scientist ___ or ____ his/her hypothesis.
Supports, proves
Proves, rejects
Supports, rejects
Disproves, proves
22 °C to K (approximate room temperature)
Answer:
295.15 i think
Explanation:
PLS HELP ME
The moon is 2.39 • 10^5 miles from the earth. The
average man is 6 feet tall. How many men would have
to stand on top of one another to reach from the earth
to the moon? (there are 5,280 feet in a mile. How many
miles is 6 feet?)
Number of men required to stand on top of each other to reach moon from earth are :
[tex] \boxed{ \boxed{ \: \: \: \: \: \: \: 210320000 \: \: \: \: \: \: \: }}[/tex]
Could someone help me please?
Answer:
I think its A And C OR D HOPE ITS RIGHT
Explanation: BY THE LOVE YOUR AVTAR
True statements are:
Density increases if the volume of an object decreases and the mass remains the same.
Density increases if the mass of an object increases and the volume remains the same.
Density remains the the same if the mass and volume of an object increases proportional.
Further:
Density = Mass/Volume
Gimme ur bath water plzzzz
Answer:
plzz can you explain in detail this Q
Is every mixture also a solution? Is every solution also a mixture? Explain.
Answer:
Not all mixtures are solutions. A solution is a specific term that describes an even or homogeneous mixture of a solute, the substance being mixed, in a solvent, the substance that is in a greater amount in which the solute dissolves. All solutions are mixtures because it is two or more substances mixed together.
What happens to the carbon in natural gas when the gas burns in a badly fitted gas fire? Explain your answer
Explanation:
Fuels such as natural gas and petrol contain hydrocarbons. These are compounds of hydrogen and carbon only. When they burn completely: the carbon oxidises to carbon dioxide
777,600 seconds to days
Answer:
9 days
No explanation needed.
After using soap to wash dishes by hand, it is sometimes difficult to keep your hands from remaining slick. Explain why rinsing your hands in lemon juice would make them less slick.
Answer:
Explanation: Rinsing hands in lemon juice would make them less slick because when a acid (soap) and a alkaline (lemon juice) reacts it becomes neutral
Write the IUPAC name of (image attached) (2 COOH)
Answer:
1,2-benzenedicarboxylic acid /phthalic acid
When potassium is added to water, what causes the explosion?
Answer:
The highly unstable pure sodium or potassium wants to lose an electron, and this splits the water atom, producing a negatively charged hydroxide ion and hydrogen and forming an explosive gas that ignites.
Explanation:
Calculate the molarity of a solution made by dissolving 4.0 g of calcium bromide, CaBr2, in enough water to give 200 mL of solution.
Answer:
0.1 M
Explanation:
Molarity = number of moles / litres of solution.
4 g of calcium bromide = 0.02 mol
(found by dividing 4 g by the atomic mass of CaBr2, which is 199.886)
200 mL of solution = 0.2 litres
Molarity = 0.02 mol / 0.2 L = 0.1 M
Taking into account the definition of molarity, the molarity of the solution is 0.1 [tex]\frac{moles}{L}[/tex].
In first place, you have to know that molarity is a measure of the concentration of that substance and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:
[tex]Molarity=\frac{number of moles}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{L}[/tex].
In this case you know that 4.0 g of calcium bromide, CaBr₂, dissolves in enough water. Then, the molar mass of calcium bromide being 199.8 g/mole, (that is, the mass of one mole of the compound), the number of moles that 4.0 g of the compound contain is calculated as:
amount of moles=4.0 g × [tex]\frac{1 mole}{199.8g}[/tex]
amount of moles= 0.02 moles
And being the volume 200 mL = 0.2 L (being 1000 mL= 1 L), and replacing the values in the definition of molarity, you obtain:
[tex]Molarity=\frac{0.02 moles}{0.2 L}[/tex]
Solving:
Molarity= 0.1 [tex]\frac{moles}{L}[/tex]
In summary, the molarity of the solution is 0.1 [tex]\frac{moles}{L}[/tex].
Learn more about molarity with this example: brainly.com/question/15406534?referrer=searchResults
Why is agar medium used in Petri dishes?
A.It makes bacteria appear larger.
B.It sterilizes the petri dish.
C.It helps microorganisms grow.
D.It makes cells glow.
Answer:
C is the correct answer.
Explanation:
Agar provides a solid growth surface for the bacteria, upon which bacteria reproduce until the distinctive lumps of cells.
The agar medium is used in Petri dishes because it helps microorganisms grow. option C is correct.
What is a microorganism?A microorganism is a microscopic body that cannot be seen with the normal human eyes on anything it can be a virus or bacteria or both. Viruses are disease-causing mostly but there are some good bacteria too.
The use of agar medium is the source of food for the microorganism as all the micronutrients and macronutrients with essential amino acids are present into it.
Therefore, option C is the correct agar medium used in Petri dishes because it helps microorganisms grow.
Learn more about microorganism, here:
https://brainly.com/question/9004624
#SPJ2
B 1,6,4
D 2, 10,8
Question 2
Magnesium ribbon burns in awyren with the fame to produce a white sold.
magnesium oxide.
2.1 is the reaction between magnesium ribon and anyen a PHYSICAL OF CHEMICAL
change? Give a reason for the answer
2.2 Write down a balanced equation for the reaction between magnesium and oxygen
2.3 Use the law of conservation of mass to show that mass is conserved during the re
In QUESTION 2.2
Question 3
ablet, with a mass of 0.25 g contains mainly calcium carbonate
Can someone help me out on this ♡
Explanation:
Actually, the diagram showned in the picture gave you some hints.
Moving every one block to the left indicates 10 times the value of the symbol than the previous one.
For instance,
[tex]1\text{ km}=10^1\text{ hm}=10^2\text{ dam}=10^3\text{ m}[/tex]
Take the first question as example, since "k" is 9 blocks from the left of mu (u),
[tex]1 \text{ kg}=10^9 \text{ }\mu\text{g}[/tex]
[tex]\text{So }.000078\text{ kg}=.000078\times10^9 \text{ }\mu\text{g}=7.8\times10^{-5}\times10^9 \text{ }\mu\text{g}=7.8\times 10^4\text{ }\mu\text{g}[/tex]
Similarly,
[tex]1 \text{ cL}=10^{-2} \text{ L}[/tex]
[tex]\text{So }34800\text{ cL}=34800\times10^{-2} \text{ L}=3.4800\times10^{4}\times10^{-2} \text{ L}=3.48\times 10^2\text{ L}[/tex]
[tex]1 \text{ Mm}=10^{3} \text{ km}[/tex]
[tex]\text{So }.0283\text{ Mm}=.0283\times10^{3} \text{ km}=2.83\times10^{-2}\times10^{3} \text{ km}=2.83\times 10^1\text{ km}[/tex]
Compound 2 contains 2.0g of hydrogen and 32.0g oxygen. What is the percent compound of each element?
Note down the formula below
[tex]\boxed{\sf Mass\%\;of\; element=\dfrac{Mass\:of\:the\: element}{Mass\;of\:the\: compound}\times 100}[/tex]
Mass of the compound
[tex]\\ \sf\longmapsto 32+2=34g[/tex]
Mass % of Hydrogen:-
[tex]\\ \sf\longmapsto \dfrac{2}{34}\times 100[/tex]
[tex]\\ \sf\longmapsto \dfrac{1}{17}\times 100[/tex]
[tex]\\ \sf\longmapsto 5.8\%[/tex]
Mass % of Oxygen:-
[tex]\\ \sf\longmapsto \dfrac{32}{34}\times 100[/tex]
[tex]\\ \sf\longmapsto \dfrac{16}{17}\times 100[/tex]
[tex]\\ \sf\longmapsto 94.2\%[/tex]
Stars with a greater overall mass are and , and they consume their nuclear fuel .
Answer:
they will expand
Explanation:
as they bring out they become red giants then eventually white dwarfs or the scarier options a black hole
Please help me!! Really important
Answer:
Lanthanum and Lutetium
I hope this will help you
A substance was analysed and found to contain 26.57 % potassium, 35.36% chromium, and
38.07 % oxygen by mass.
What is the empirical formula of the substance?
Select one:
question
O a. K2Cr205
O b. K2Cr207
O c. KCr2O7
O d. K_Cro
Answer: K2Cr2O7
Explanation: Pretend we have 100g of the compound. use the percentage to calculate how many grams of each element are in the 100g.
K: 26.57g
Cr: 35.36 g
O: 38.07 g
Now divide by the molar mass of each element to find the moles of each:
K: 0.7 moles
Cr: 0.7 moles
O: 2.4 moles
That gives us 3.8 moles total. But what's important is to find a factor that would bring all of these mole values to a whole number, since they must be in whole number proportions. The closest I got was around 3.
That would lead to the following empirical formula: K2Cr2O7.
