Answer:
molecular formula = molar mass ÷ empirical formula
n = 142 ÷ 142
n = 1
molecular formula (P2O5)1 = P2O5
heleep I don't understand
Answer:
Loading...
Explanation:
Answer:
This is animal shell
Explanation:
Because it shape and size is in circular shape of body so we can find the types
A group of students conducted an experiment to determine the effect of heat on the germination(sprouting) of sunflower seeds. Which of the variables listed below is the least important to control in this experiment?
a
the temperature of which the seeds are heated
b
the length of time the seeds are heated
c
the type of soil used
d
the amount of moisture in the soil
what grade is this because apparently i like to know what grade it is before i solve it
an element consists of 1.40% of an isotope
Answer:
I think it's lead (pb). Hope this helps.
Answer:
lead
Explanation:
has a density of 0.855 g/mL. How many LITERS would have a mass of 1.00 kg?
Answer:
V = 1.154 L
Explanation:
1. convert 1.00 kg to grams = 1,000 grams
2. use density formula d = m/v to find volume
v = m/d = 1,000 g = 1,154.73 ml
0.866 g/mL
convert to liters, divide by 1000 ml
V = 1.154 L
There are three stable forms of neon: neon-20, neon-21, and neon-22. Which statement is true
- the atomic mass of the three isotopes is the same
-the three isotopes are all radioactive
-the three isotopes are equally abundant in nature
-the charge of all isotopes is the same
Answer:
The charge of all isotopes are the same.
Explanation:
Some isotopes are radioactive.
They have different numbers of neutrons resulting in different atomic mass.
Not all isotopes are equally abundant in nature.
Answer:
Then answer is the charge of all isotopes is the same
Explanation:
5. What is common among the following phenomena?
* Blinking of traffic light
* Rotation of blades of fan
* Swinging of pendulum of a clock
a) All are chemical changes
b) All are periodic changes
c) All are undesirable changes
d) All are irreversible changes
Answer:
All are periodic changes
[And is that a todoroki pfp, I like MHA too
(・∀・) ]
any two uses of mixtures
Answer:
Any two used of mixtures are 1) sand and water 2) sugar and salt
Explanation:
A. Identify the type of molecule shown in the drawing. (2 points)
Answer: 1) Caboxylic acid
2) Ether
3) Ester
4) Aldehyde
5) Amine
6) Alcohol
Explanation: The type of a molecule is based it's primary functional group.
https://en.wikipedia.org/wiki/Functional_group
The identities of the given molecules shown in the drawing are:
1) Carboxylic acid.
2) Ether
3) Ester
4) Ethane
5) Aldehyde
6) Amine
7) Alcohol
What are the organic compounds?Organic compounds are those compounds, which contain carbon-carbon and carbon-hydrogen bonds.
The five organic compounds are lipids, carbohydrates, protein, nucleotide, etc.
Thus, the correct option is 1) Carboxylic acid.
2) Ether
3) Ester
4) Ethane
5) Aldehyde
6) Amine
7) Alcohol
Learn more about organic compounds
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i need help please........
Answer:
cd
Explanation:
image is formed due to reflected light rays and it is enlarged because image distance/ object distance = height of image/height of object
v>u so image is enlarged
if electromagnetic radiation has a frequency of 2.0 x 10^15 s^-1 what is the radiation’s energy?
[tex]1.3\times 10^{-18}[/tex] Joule is the radiation’s energy.
Explanation:
The energy of electromagnetic radiation is given by Planck's law:[tex]E=h\times \nu[/tex]
Where:
E = Energy of electromagnetic radiation
h = Planck's constant=[tex]6.626\times 10^{-34} Js[/tex]
[tex]\nu[/tex] = frequency of the electromagnetic radiation
Given:
The frequency of the electromagnetic radiation =[tex]\nu = 2.0\times 10^{15} s^{-1}[/tex]
To find:
The energy of the electromagnetic radiation
Solution:
The frequency of the electromagnetic radiation = [tex]\nu = 2.0\times 10^{15} s^{-1}[/tex]
The energy of the radiation = E
[tex]E=h\times \nu\\E=6.626\times 10^{-34} Js\times 2.0\times 10^{15} s^{-1}\\=1.3\times 10^{-18} J[/tex]
[tex]1.3\times 10^{-18}[/tex] Joule is the radiation’s energy.
Learn more about Planck' law here:
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3. Take vinegar, lemon juice, tap water in three separate glass beakers. Put chalk piece,pin, egg shell, leaves in three beakers. Note your observations how test the gas evolved in it.
Answer:
This process is know as Chromotography
Explanation:
why is chromatography not able to separate components of a solution which have same speed?Give reason.
Answer:
The dyes which cover more surface area will travel more slowly. Similarly if two substances which have same speeds, they are going to travel together and they won't separate as chromatography separates substances having different rates or speeds for travelling
Chromatography cannot separate components with the same speed due to their identical affinities.
Why does chromatography fail to separate components with similar speeds?In chromatography, separation relies on differences in affinity between the components and the stationary phase. When components have the same speed, it indicates that their interactions with the stationary phase are nearly identical.
As a result, the forces that cause one component to move ahead of the other are not pronounced enough to achieve effective separation. Without distinct interactions, chromatography struggles to discriminate between components leading to poor separation outcomes.
Read more about chromatography
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Explain briefly why ammonia and oxygen molecules participate readily in coordinate bonding. Give an example for the formation of an ion by ammonia by this means. Show by means of electronic diagram the formation of a coordinate linkage between phosphorus tri chloride and oxygen?
Explanation:
When one atom supplies both electrons in forming a two-electron bond, it is known as a dative covalent or coordinate bond. ... In this case, the nitrogen atom has a lone pair of electrons that coordinates to the hydrogen cation, which has zero electrons, forming a covalent bond.
PLEASE HELP THIS IS IMPORTANT. Answer the ones u know leave the ones u don’t. Be specific too and I’ll give u a brainlist/5 star !!!
1) you would have noticed water vapour forming on the inside of the glass jar, where did this water come from?
hint: Think about what happens in a combustion in a combustion reaction.
2) explain why the water rises in the glass jar?
Answer:
1) Condensation.
2) See below.
Explanation:
1) The warmer water vapour from the surroundings came into contact with the cooler inner surface of the glass jar and condensed, forming the water droplets (water vapour) on the inside of the glass jar.
2) As condensation occurs, condensed water vapour will drip into the water solution in the glass jar, causing the water to rise in the glass jar.
What does PA signify? How does it differ from 4P?
Answer:the snaswer is combined
Explanation:you have to piutg it’s toggle did dcdhcd
Does an astronaut have more mass on earth then space? why or why not?
Answer:
No
Explanation:
No, his mass remains the same no matter where he is in the universe.
But then again the moon has less gravitational pull, therefore your weight and mass will be smaller in space and on the moon than on earth
I hope this was helpful! ;)
Revision has a atoMic number of 37 and a mass number of 85. HIW many protons, neutrons and electrons does an ion of rubidium with a 1+ charge have
Answer: 37 protons, 48 neutrons, and 36 electrons.
Explanation: I assume "Revision" is Rubidium. It is atomic number 37, so it has 37 protons. It's atomic mass is 85, so it has an average of (85-37) = 48 neutrons. It has a charge of +1, so one electron of the original 37 has left.
The phenomenon where an electric current is produced by shining a light on a metal plate is called the ________ effect. The minimum frequency required to cause to flow is called the ________ frequency. This frequency depends on the identity of the metal used.
Answer:
Photoelectric, Threshold
Explanation:
Your welcome
A car start from rest and covers distance of 100m after 10seconds.if the acceleration is 2m/s square, calculate the final velocity..
Answer:
20 m/s
Explanation:
solution,
initial velocity (u)=0 m/s
Distance covered(s)=100m
Time taken(t)=10 seconds
Acceleration (a)=2m/s²
Now,
By using first equation of motion, we have
v=u+at
=0+2×10
=20 m/s
I hope it helped U
stay safe stay happy
Which of the following
statements is true about the
charges of protons and neutrons?
A. Protons and neutrons have the same charge.
B. Protons have a positive charge and neutrons
have no charge.
C. Protons have a negative charge and neutrons
have a positive charge.
Answer:
B
Explanation:
Protons have a positive charge while neutrons have no charge because they are neutral.
Answer:
b
Explanation:
b/ce protons have+ charge while neutrons have no charge
PLZ HELP MEEE
A tire company wants to determine what kind of rubber will last the longest for their tires. What are some variables that the researchers will want to make controlled variables?
In an experiment, we can define 3 types of variables.
Independent variables: Are these ones that the scientist can control and modify, in this case, would be the kind of rubber for the tires.
Dependent variables: Are the variables that react to the changes in the independent variables. In this case, would be "how much lasts each type of rubber".
Controlled variables: Are all of these variables that also have an impact on the dependent variable, so we need to control them (fix them) so they do not affect the study of the independent variable.
So, for this particular experiment, to find controlled variables we need to think on what things do affect the durability of tires.
Some examples can be:
The material of the ground where the tires are being tested.The temperature of the ground where the tires are being tested.The type of car where the tires are being tested.The speed at which the tires are being tested.The internal pressure at which the tires are being tested.If you want to learn more, you can read:
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Ice cracking
a
Chemical Change
b
Physical Change
Answer:
Physical change
Explanation:
As no new substance is formed
I don't know how to write about tentative.....can u help me?
Answer:
The definition of tentative is not definite or final. An example of tentative is possible, though not definite, plans to go to the movies sometime on Friday.
Freezing water cracking limestone
a
Chemical Change
b
Physical Change
Answer:
Freezing water and cracking limestone are physical changes.
A car is moving with the a speed of 25m/s.Calculate the distance travelled the car in 30seconds
Answer:
750 m
Explanation:
Hi there!
We're given that:
⇒ The speed of the car is 25 meters/second
⇒ The car travelled a certain distance in 30 seconds
To calculate distance, use the formula:
Distance = Speed × Time
Distance = 25 × 30
Distance = 750
Therefore, the car travelled a distance of 750 m in 30 seconds.
I hope this helps!
Answer:
[tex]\boxed {\boxed {\sf 750 \ meters}}[/tex]
Explanation:
We are asked to find the distance a car traveled. Distance is the product of speed and time.
[tex]d= s \times t[/tex]
The speed of the car is 25 meters per second. The time is 30 seconds.
s= 25 m/s t= 30 s[tex]d= 25 \ m/s * 30 \ s[/tex]
The units of seconds cancel each other out.
[tex]d= 25 \ m * 30[/tex]
[tex]d= 750 \ m[/tex]
The car traveled 750 meters in 30 seconds at a speed of 25 meters per second.
Which of the following is NOT a pure substance?
а.
b.
C.
d.
Answer:
lol where is your questions??
how many figures does 40.01 have?
Answer:
4 the number of figures
Explanation:
answers above
Why is copper sulfate a compound and diamond an element?
Answer:
Copper(II) sulfate is the chemical compound with the formula CuSO4. This salt exists as a series of compounds that differ in their degree of hydration. The anhydrous form is a pale green or gray-white powder, whereas the pentahydrate (CuSO4·5H2O), the most commonly encountered salt, is bright blue.
Explanation:
Answer:
Copper sulfate is the compound with the formula CuSO4. This salt exists as a series of compounds that differ in their degree of hydration. The anhydrous form is a pale green or gray-white powder, whereas the pentahydrate (CuSO4·5H2O), the most commonly encountered salt, is bright blue.Yes, Diamond is called as an element because it is a crystalline form of a single element i.e., carbon. The structure of Diamond is cubic type, in which one carbon atom is tetrahedrally bonded to four other carbon atoms. This tetrahedral structure is extended in all three directions.Explanation:
I hope U like my answer and my answer helped U....how could you use this procedure to identify
as unknown type of green ink?
Answer:
After conducting the experiment it was clear to see that the green ink used was indeed a mixture as it separated from the rubbing alcohol.
Help!! due tomorrow
.
Answer:
It's B. The molecules in the system have more kinetic energy than a solid.