Answer: D
Explanation: A healthy ecosystem is capable of exisitng based on the matter within that ecosystem. Energy is often supplied externally (e.g., the sun, geothermal, etc.) and is stored by the ecosystem in the form of chemical bonds made between the elements. Plants utilize matter (minerals, carbon dioxide, water) within the ecosystem (plus whatever is delivered via asteroid or candy wrappers). Animals depend on the plants for both energy and matter that is transformed into the compunds needed for their existence. Decomposers act to reduce complex matter (plants and animals) back into more basic compounds that then reenter the ecosystem as raw material for he next set of plants, animals, humans, and aliens.
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:
Freezing water cracking limestone
a
Chemical Change
b
Physical Change
Answer:
Freezing water and cracking limestone are physical changes.
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
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
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
on what factors the Modern Periodic Table is different from that of the Mendeleev's periodic table?Write any two reasons.
Explanation:
The main difference between Mendeleev and Modern period table is that Mendeleev's periodic table orders the elements based on their atomic mass whereas Modern periodic table orders the elements based on their atomic number.
Mendeleev's periodic law states that the physical and chemical properties of the elements are a periodic function of their atomic weights while Modern periodic law states that physical and chemical properties of elements are a periodic function of their numbers.
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
Can lead ii carbonate conduct electricity? Explain your answer
Solid Lead II carbonate can not conduct electricity because it is insoluble in water.
First of all, we must establish the fact that ionic solids conduct electricity in solution because they can be broken up into ions in solution.
In the solid state, they do not conduct electricity because the ions are strongly bound by electrostatic forces.
However, if an ionic substance is insoluble in water, its ions are not available to conduct electricity since ions are the charge carrier in solution. As a result of this, such a substance will not conduct electricity.
Since Lead II carbonate is insoluble in water, its ions are not available hence the substance does not conduct electricity.
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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.
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
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.
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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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:
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.
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
Help!! due tomorrow
.
Answer:
It's B. The molecules in the system have more kinetic energy than a solid.
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
an element consists of 1.40% of an isotope
Answer:
I think it's lead (pb). Hope this helps.
Answer:
lead
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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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....When a gas is dissolved in a liquid, what happens when the pressure increases?
Answer: B, the gas is being squeezed out of the liquid.
Explanation: The gas does not want to be trapped inside of the liquid, so it is trying to force it’s way out. Therefore creating more pressure in the container or whatever the liquid is being held in.
Answer: more gas dissolves into the liquid
Explanation: just got it wrong thats the right answer
In comparing groups, the first or the second, which group was more precise or was the precision the same
Comparing the data obtained online, the first group is more precise
The reason the above selection is correct is as follows;
Question: Parts of the question appear missing from a similar question online and included here;
First Group:
[tex]\begin{array}{|c|c|c|c|c|c|c|} Team \ a &Team \ b&Team \ c&Team \ d&Team \ e&Team \ f&Team \ g\\2.77 \ cm&2.60 \ cm&2.80 \ cm&2.65 \ cm&2.75 \ cm&2.65 \ cm& 2.68 \ cm\end{array}\right][/tex]
Second Group
[tex]\begin{array}{|c|c|c|c|c|c|c|} Team \ a &Team \ b&Team \ c&Team \ d&Team \ e&Team \ f&Team \ g\\2.70 \ cm&2.78 \ cm&2.62 \ cm&2.65 \ cm&2.75 \ cm&2.80 \ cm& 2.60 \ cm\end{array}\right][/tex]
Calculations for the first group:
The average = (2.77 + 2.60 + 2.80 + 2.65 + 2.75 + 2.65 + 2.68)/7 = 2.7
The range = 2.80 - 2.60 = 0.20
The approximate ± range of the average = ±0.2/2 = ±0.1
The precision of the first measurement is 2.7 ± 0.1 cm
Calculations for the second group:
The average = (2.70 + 2.78 + 2.62 + 2.65 + 2.75 + 2.80 + 2.60)/7 = 2.7
The range = 2.80 - 2.60 = 0.20
The approximate ± range from the average = ±0.2/2 = ±0.1
The range of values from the average is approximately ±0.1 cm
The precision of the first measurement is 2.7 ± 0.1 cm
Method to determine precision:
Precision is given by the finding the average deviation and the standard deviation as follows;
[tex]\mathbf{Average \ deviation} = \dfrac{\sum \left | x - \mu \right |}{n}[/tex]
[tex]\mathbf{Standard\ deviation} =\sqrt{\dfrac{\sum \left ( x - \mu \right )^2}{n}}[/tex]
Where;
μ = The mean or average = 2.7
n = The number of items (count) of the data = 7
For the first group, we have;
[tex]\mathbf{\dfrac{\sum \left | x - \mu \right |}{n}} = \dfrac{0.07 + 0.1 + 0.1 + 0.05 + 0.05 + 0.05 + 0.02 }{7} = \mathbf{0.062857}[/tex]
The average deviation of the first group = 0.062857
∑(x - μ)² ≈ 0.0328
[tex]\mathbf{The \ standard\ deviation} =\sqrt{\dfrac{0.0328}{7}} \approx \mathbf{0.068452}[/tex]
For the second group, we have;
[tex]\mathbf{\dfrac{\sum \left | x - \mu \right |}{n}} = \dfrac{0.0+ 0.08 + 0.08 + 0.05 + 0.05 + 0.1 + 0.1 }{7} = \mathbf{0.06571428571}[/tex]
∑(x - μ)² ≈ 0.0378
[tex]\mathbf{The \ standard\ deviation} =\sqrt{\dfrac{0.0378}{7}} \approx \mathbf{0.073485}[/tex]
By using the average deviation, and standard deviation values, the deviation of the second group is more than the first group and therefore the first group is more precise
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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.
Which of the following best describes a scientific model?
Question 6 options:
Something used to represent an idea or process
A way to prove a theory is true
A direct experience in nature
A prediction that can be tested
Explanation:
idea= hypothesis
xperience in nature= read Darwin's theory..
with birds from Galapagos island or rain forest environment., had proven that the shape of a bird's beaks, determined what their diet consisted of In the wild.
captured birds from such countries, has proven, an omnivore or seed eater...through testing plus dissection.
WHATS THE FREEZING POINT FOR WATER
Answer:
0 degrees Celcius and 32 degrees fahrenheit
Explanation:
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.
(Physical Science)
Which group of metals includes elements with one valence electron? (1 point)
A. alkaline earth metals
B. rare earth metals
C. alkali metals
D. transition metals
Answer:
C
Explanation:
alkali metals are the Group I elements, which have 1 electron in their valence shells
Answer:
Alkali metals are the elements which have only one valence electron in their outermost or ultimate shell.
Explanation:
Alkaline Earth metals have 2 valence electron in their outermost shell and readily give up their 2 electron to achieve stability.
Rare Earth Metals have 3 valence electron in their outermost shell and they have high magnetic moments and divert range of magnetic structure.
Alkali Earth metals have 1 valence electron.
Transition metals generally have 2 valence electron .
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How can you determine the number of shells in an atom of a certain element, based
on the element's position on the periodic table?
Answer: At some point in your chemistry education, you may have been introduced to the song “The Elements in which Tom Lehrer does a rapid
fire musical rendition of all the elements' names. Like me, you may even have been offered the opportunity to memorize this song for extra credit. If so, it’s possible that you still remember the names of all the elements, which is an impressive feat—not to mention a fun trick to pull out at parties.
Explanation:
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