Answer:
a substance made by mixing other substances together.
why does The mass of an atom is not dependent on the number of electrons in an atom.
Answer:
The mass of the atom, its atomic mass, depends upon the sum of the number of protons and the number of neutrons present in the nucleus. Since the properties of the electrons depend upon the number of protons in the nucleus of an atom, each different atomic number corresponds to a qualitatively different kind of atom.
Answer:
This is really an extended comment to Geoffrey's answer, so please upvote Geoffrey's answer rather than this.
The mass of a hydrogen atom is 1.67353270×10−27 kg. If you add the masses of a proton and electron together then they come to 1.67353272×10−27 kg. The difference is about 13.6eV, which is the ionization energy of hydrogen (though note that the experimental error in the masses isn't much less than the difference so this is only approximate).
This shouldn't surprise you because you have to add energy (in the form of a 13.6eV photon) to dissociate a hydrogen atom into a free proton and electron, and this increases the mass in accordance with Einstein's famous equation
What is the correct formula for Elementium Nitride?
Answer:
AlN
Explanation:
have a great day
To balance a chemical reaction you can list all the atoms on the right and left, then count, and add coefficients until the reaction is balanced. Look at the reaction below. Choose the picture that shows a balanced chemical reaction for the reaction below.
Answer:
I think option 3 is correct
Why do plants and animals adapt to their environment?
НЕ
А
to become better at getting food
B
to protect themselves against other animals
с
to become better able to survive in their surroundings
D
all of the above
Answer: all of the above
Explanation:
Plants and animals must be able to adapt to their surroundings, because otherwise they could be in danger because of a simple change weather patterns or different predators roaming around. They will also have possible competition.
At what temperature would 2.10 moles of Nitrogen gas have a pressure of 1.25 atm and in a 25.0 L tank? (Hint: R = 0.082 L atm K−1 mol−1)
Don't spam!!!
As we know that
PV = nRT
Here,
P = PressureV = Volumen = MolesT = TemperatureAccording to the question,
1.25 × 25 = 2.1 × 0.082 × T31.25 = 2.1 × 0.082 × T31.25 = 1.722T31.25/0.1722 = T181 ≈ TTemperature is 181 K
[tex]\large\fbox{181 K}[/tex]Which of the following is an adaptation that helps protect the animal?
А
Cows have incisors.
B
Cactuses have thick stems.
с
A porcupine has sharp quills.
D
Hummingbirds have long, skinny beaks.
In an ecosystem, a porcupine having sharp gills is an adaptation that helps protect the animal.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the ecosystem through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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I WILL MARK BRAINLIEST
Predict: As the block slides down the ramp, how do you expect the gravitational potential energy and energy of the block to change?
Answer:
gravitational potential energy doesnt change srry the other one as in explaining it
How many hydrogen peroxide must decompose to produce 46.8g of water?
Explanation:
sorry I really need points so I can ask a question
i will give brainliest
Answer:
a is C2H2
and c6h6
Explanation:
What's the equation used to calculate how far a wave has traveled?
30. The more reactive halogen elements are able to replace the less reactive halogens from their com-
pounds. For example, if chlorine gas is bubbled
through a potassium iodide solution, elemental
iodine is produced.
Cl2(8) + Kl(aq) →12(s) + KCl(aq)
Calculate the mass of iodine produced when 2.55 g
of chlorine gas is bubbled through an excess amount
of potassium iodide solution.
31. Although we usually think of substances as “burn-
ing” only in oxygen gas, the process of rapid oxida-
tion to produce a flame may also take place in other
strongly oxidizing gases. For example, when iron is
heated and placed in pure chlorine gas, the iron
"burns” according to the following (unbalanced)
reaction:
Fe(s) + Cl2(8) ► FeCl3(s)
How many milligrams of iron(III) chloride result
when 15.5 mg of iron is reacted with an excess of
chlorine gas?
please help. this is due tonight. thanks!
Answer:
n=m/mr
n of cl2=0.0713mole
Form equation
cl2+k------- I2 s+kcl
1mole of cl=I moleof I2
0.0713mole of =x of I2
X mole of I2=0.0713
n=m/mr
0.0173=m/253.9
mass of I2=18.09g
Why do we perform an experiment?
Answer:
Experiment plays many roles in science. One of its important roles is to test theories and to provide the basis for scientific knowledge. It can also call for a new theory, either by showing that an accepted theory is incorrect, or by exhibiting a new phenomenon that is in need of explanation.
Explanation:
Answer:
Explanation:
One of its important roles is to test theories and to provide the basis for scientific knowledge that we need to know. How are we supposed to know the answer to our question if we don't perform the experiment to test our question.
the metallic compound reduced to the metal by electrolysis is _____
please girls answer, because I think u r always right.
Answer:
Magnesium oxide
Explanation:
When magnesium reacts with oxygen, the magnesium atoms donate electrons to O2 molecules and thereby reduce the oxygen. Magnesium therefore acts as a reducing agent in this reaction. The O2 molecules, on the other hand, gain electrons from magnesium atoms and thereby oxidize the magnesium.
8. Why would it be a bad idea to make coins made of sodium metal?
Answer:
Sodium reacts with the oxygen in air. It reacts vigorously with oxygen and the moisture that is already present in the air and thus catches fire.
It would be a bad idea to make coins made of sodium metal, beacause of their reactive nature.
What is reactive species?Those species which are not stable in nature and always ready to show reaction with another species, is known as reactive species.
Sodium metal is highly reactive in nature, means it easly reacts with the atmospheric oxygen and shows oxidation or with the moisture content of atmosphere as a result of which vigorously catches fire. That's why we don't use sodium to make coin.
Hence, beacause of reactive nature sodium is not used.
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A sample of CO2 has a volume of 6.08 cm3 at 2.0 atm. At what pressure would this sample of gas have a volume of 42.0 cm?
А
28.9 atm
00
2.89 atm
С
0.289 atm
D
289 atm
The Theory of _________ states that new ocean crust is formed at ocean ridges where plates are diverging.
2
Is the molecule with the formula Br
an element mixture or compound?
How do you know this?
Answer:
i do not know
Explanation:
why fluorine would rather bind to calcium than hydrogen
Answer:
Because looking at the reactivity series of both elements Calcium is more reactive than hydrogen.
The term used to describe the Moon phases as the light spreads across the surface of the moon or grows.
Answer:
Explanation:
New moon
Waxing crescent moon
First quarter moon
Waxing gibbous moon
Full moon
Waning gibbous moon
Last quarter moon
Waning crescent moon
Answer: Waxing
Explanation: Waxing means is getting lighter.
Waning means its getting darker.
HELP PLEASE | 15 POINTS Determine the number of valence electrons in each diagram shown below.
answer:
Cl = 7 valence electrons
Mg = 2 valence electrons
explanation:
in order to determine the valence electrons, just look at the outermost shell or the last shell. whatever number of electrons it has will be the number of valence electron NEED HELP! thank you!
The same element is present before and after a
O chemical change
O physical change
O chemical reaction
O none of these
Answer:
This is a physical change.
Explanation:
As long as the identity of the substance has not changed, and the element is present before and after, it is a physical change! (Ex: ice melting)
How many meters did the bus travel in 4.5 minutes
Answer:
Using the graph, we can see that after 4.5 minutes, the bus traveled 4500 meters. Find 4.5 on the x axis, and then see what y value it corresponds to.
Let me know if this helps!
Answer:
By using the data given in the Graph the bus covered 4500meters in 4.5 minutes
Explanation:
Which of the following is an adaptation that helps the animal eat?
A
Squirrels are the colors of the trees they live in.
B
Pelicans have big beaks.
с
Cactuses are covered in spikes.
D
Rainforest plants have waxy leaves.
Answer:
I think it's B
Explanation:
Pelicans have big beaks to hold how big the fish they catch are.
I hope this helps.
¿How do the products of the reaction to the phenol red test and the splint test? Please help me it's for today.! :((
Answer:
The answer in this question is show you made Sodium Hydroxide and Hydrogen Gas.In order to do the products of the reaction relate to the phenol red test and the splint test you need to show that you made Sodium Hydroxide and Hydrogen Gas. Show that you made Sodium Hydroxide and Hydrogen Gas so that the products of the reaction relate to the phenol red test and the splint test.
What is the structure of epithelial cells?
How many grams of lithium sulfide (Li2S) are in 275 g of a 16 % aqueous solution of Li2S?
Answer:
600 mAh·g−1
Explanation:
i hope this is good let me know if its wrong
Can some right a paragraph about photosynthesis pls =))))))))))))))))))))))
Answer:
Photosynthesis is the process in which plants harness energy from the sun to make their own nutrition. The process converts light energy into chemical energy through cellular respiration.
Explanation:
Just to start you off. I hope it helps! (❛ ᴗ ❛)
Answer:
Photosynthesis is the process which a plant makes it's own food. The plant get energy from the sun and water from the soil. The plant lets the suns energy flow though so it touches all the parts that need it. When it get the water from the soil it goes into the stem and to the leaves. Photosynthesis is important because it benefits the air and us too. We can also help by put carbon dioxide. Photosynthesis is part the life cycle of a plant.
Explanation:
Do plants absorb all types of light? Yes or no?
If you wanted to predict which elements are explosive how would you organize the periodic table?
Explanation:
on a table then all will put them in a box and try every one or yoy could put ir out side and try it on the table
Lower explosive elements should be placed on the left side and high explosive elements on the right side of the periodic table.
If we wanted to predict which elements are explosive we will organize the periodic table starting from least explosive to high explosive just like the arrangement is done in the modern periodic table in which elements having lower atomic number are present at the left side of periodic table.
Whereas the elements having higher atomic number are placed on the right side of the periodic table so we can conclude that we have to place less explosive elements on the left and more explosive elements on the right side of the periodic table.
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Plz help meeeeeeee !!!!!
Answer:
Na2S
Explanation:
last answer with Na2S