Density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it is expressed as:
[tex]Density = \frac{Mass}{Volume }[/tex]
With the above formula, we can obtain the density of the substace given in question as illustrated below:
Step 1Data obtained from the question
Mass = 52.11 g.
Volume of water = 12.5 mL.
Volume of water + Subtance = 31.8 mL
Density =? Step 2Determination of the volume of the substance
Volume of water = 12.5 mL.
Volume of water + Subtance = 31.8 mL
Volume of substance =?Volume of substance = (Volume of water + Subtance) – (Volume of water)
Volume of substance = 31.8 – 12.5
Volume of substance = 19.3 mL Step 3Determination of the density of the substance
Mass of substance = 52.11 g.
Volume of substance = 19.3 mL
Density =?[tex]Density = \frac{Mass}{Volume } \\\\Density = \frac{52.11 }{19.3}[/tex]
Density = 2.7 g/mLTherefore, the density of the substance is 2.7 g/mL
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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.
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what is the mass 2 moles of urea
Answer:
60.06 g/mol
The solute is urea, CO(NH2)2. Molar mass of urea: (12.01) + 16.00 + 2(14.01 + 2(1.008)) = 60.06 g/mol.
Explanation:
please mark me brainliestAnswer:
60.06 g/mol
Explanation:
the solution area,CO(NH2)2.molar mass urea:
(12.01)+16.00+2(14.01+2(1.008))=60.06g/mol
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:
1. Obtain Information Search for and watch an
online video clip that shows the lotus effect.
What do
you
think causes this phenomenon?
Answer:
up with you and the other day and I don't think I can get a chance
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.
Please help me!! Really important
Answer:
Lanthanum and Lutetium
I hope this will help you
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.
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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
How many elements are in “H2”
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:
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:
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
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:
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
Chemical bond meant by.... what?
Answer:
Chemical bonding, any of the interactions that account for the association of atoms into molecules, ions, crystals, and other stable species that make up the familiar substances of the everyday world.
Answer:
A chemical bond is the physical phenomenon of chemical substances being held together by attraction of atoms to each other through sharing, as well as exchanging, of electrons -or electrostatic forces.
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
Write the IUPAC name of (image attached) (2 COOH)
Answer:
1,2-benzenedicarboxylic acid /phthalic acid
What process must occur to cause sediment to stick together when forming sedimentary rock?
cooling
cementation
Compaction
weathering
Answer:
Compaction and Cementation
Dissolved minerals in the ground water precipitate (crystallize) from water in the pore spaces forming mineral crusts on the sedimentary grains, gradually cementing the sediments, thus forming a rock
advantages and disadvantages of chemical
Answer:
Advantages :they are used for seeing chemical reactions .
they are used for doing chemical experiment .
they are used for making affective medicines .
Disadvantages :they harms to our environment.
they can make side effects in our body by affective medicines made by chemicals.
while doing different unknown experiments they make explosions which can also harm to us.
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
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]
22 °C to K (approximate room temperature)
Answer:
295.15 i think
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
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
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.
At the end of an experiment, a scientist ___ or ____ his/her hypothesis.
Supports, proves
Proves, rejects
Supports, rejects
Disproves, proves
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.
Which of the following is NOT a correct conversion factor?
1 cm = 0.01 m
1 km = 1000 m
1 cm = 100 m
1 dm = 0.1 m
Answer: 1 cm = 100m
Explanation: Centi- is the prefix used to designate 0.01 (one hundredth) of something. 1 cm means 0.01 m.
1 cm = 100 m is NOT a correct conversion factor. Option C is correct.
what are conversion factors?The conversion factors are the factors that re-use to convert some values from unit to unit of another value like from centimeter to meter from meter to kilometer from milligram to gram.
In one centimeter it is the suffix used to denote it is the one by hundred value of the on meter or which is equal t one meter so, 1cm = 0.01 meters as it is the 1/100 part f the one-meter distance.
Therefore, Option C is correct. 1 cm = 100 m is NOT a correct conversion factor.
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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]
