Answer:
5.625 moles of oxygen, O₂.
Explanation:
The balanced equation for the reaction is given below:
4Al + 3O₂ —> 2Al₂O₃
From the balanced equation above,
4 moles of Al reacted with 3 moles of O₂.
Finally, we shall determine the number of mole of O₂ required to react with 7.5 moles of aluminum, Al. This can be obtained as illustrated below:
From the balanced equation above,
4 moles of Al reacted with 3 moles of O₂.
Therefore, 7.5 moles of Al will react with = (7.5 × 3)/4 = 5.625 moles of O₂.
Thus, 5.625 moles of O₂ is needed for the reaction.
How do plants and animals react to changing environments?
Scientists are unable to research the organs, tissues, and cells of early organisms as these parts are rarely fossilized. Which is one reason for the lack of these fossilized parts?
Answer:
A. These parts quickly decompose.
Explanation: This is because organs are made of tissues that decompose more quickly than bone. Animals mainly eat the organs and tissues of another, not the bones. This results in quick destruction of these parts that are left behind.
Have a blessed day/night! Please mark brainliest if correct! <3
The reason for the lack of these fossilized parts is that these part quickly decompose. Hence option A is correct.
What is fossilization?Fossilization is defined as the mechanisms that are physical, chemical, and biological that result in the long-term preservation of plant and animal remnants. Fossilization is a negative representation of the creature preserved in the substrate as a fossil. Any preserved remains, impression, or trace of a once-living thing from a previous geological age is referred to as a fossil.
Decomposition is defined as the method through which decomposing organic matter yields more basic organic or inorganic elements . The process of recycling nutrients that have been consumed by an organism to create its body begins with decomposition. It is the process through which the dead tissues disintegrate and change into more basic organic forms.
Thus, the reason for the lack of these fossilized parts is that these part quickly decompose. Hence option A is correct.
To learn more about fossilization, refer to the link below:
https://brainly.com/question/6867325
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Explain why the pressure of a gas increases when its volume decreases.
HELP
Answer:
The gas pressure is raised by decreasing the volume of a gas. ... The particles can collide more often with the walls of the container because the volume has decreased. They exert force on them each time they collide with the walls. More collisions mean more force, so it will increase the strain.
hope this helped :)
a category of classification below a kingdom? A phylum B domain C species
Answer:
Phylum
Explanation:
After that it goes class, order, family, genus, and finally species. In that order, BTW before kingdom is domain.
Answer:
Phylum
Explanation:
How many liters of oxygen (at STP) are required to form 10.5 grams of hydrogen
Answer:
You'd need 6.55 L of oxygen at STP to form that much water.
Explanation:
determine the empirical and molecular formulas of a compound that gives the following analysis in math percent: 24.27% C,4.07% H, and 71.65%CL. the molar mass is known to be 197.92g/mol.
Answer:
help me with this
Explanation:
how is gas different from a liquid and a solid
a. a gas is mad of tiny particles
b. a gas has volume
c. a gas expands to fill the container
d. a gas has density
Answer:
a. a gas is mad of tiny particles
Explanation:
I believe
pls help
Plot the point (5,9)
Is seeing your breath in the cold air conduction, convection or radiation?
Answer:
convection cause it is vapor
Explanation:
What is the molarity when 1.25 mol is dissolved in 3.50 L of solution?
Answer:
0.36 mol/L
Explanation:
The formula for molarity M=m/L
m stands for moles
L stands for liters
Plug it into the equation...
M=1.25 mol/3.5 L
M=0.35714285714
30. The density of an unknown gas at 27°C and 2 atm pressure is equal with density of N2 gas at
52°C and at 5 atm
pressure. Calculate the molar mass of that unknown gas.
pls help guys
Answer:
Molar mass of the unknown gas is 64.6 g/mol
Explanation:
Let's think this excersise with the Ideal Gases Law.
We start from the N₂. At STP conditions we know that 1 mol of anything occupies 22.4L.
We apply: P . V = n . R . T
5 atm . V = 1 mol . 0.082 . 325K
V = (1 mol . 0.082 . 325K) / 5 atm = 5.33 L
It is reasonable to say that, if we have more pressure, we may have less volume.
As this is the volume for 1 mol of N₂, our mass is 28 g. Then, the density of the nitrogen and the unknown gas is 28 g/5.33L = 5.25 g/L
Our unknown gas has, this density at 27°C and 2 atm.
If we star from this, again: 1 mol of any gas occupy 22.4L at STP, we can calculate the volume for 1 mol at those conditions:
P₁ . V₁ / T₁ = P₂ . V₂ / T₂
1 atm . 22,4L / 273K = 2 atm . V₂ / 300K
Remember that the value for T° is Absolute (T°C + 273)
[ (1 atm . 22.4L / 273K) . 300K] / 2 atm = V₂ → 12.3L
This is the volume for 1 mol of the unknown gas at 2 atm and 27°C
We use density to determine the mass: 12.3 L . 5.25 g/L = 64.6 g
That's the molar mass: 64.6 g/mol
A metal atom loses electrons from its outermost energy level and acquires a
charge. These electrons join a nonmetal atom. The ionic compound formed because of this transfer of electrons is electrically
.
Answer:
Answer : A metal atom loses electrons from its outermost energy level and acquires a Positive Charge. These electrons join a nonmetal atom. The ionic compound formed because of this transfer of electrons is electrically Neutral.
Explanation or losing electrons. For metals, the number of valence electrons are less and it is easier to lose these electrons.
When electrons are lost, the number of protons become more than the electrons. This creates an excess of positive charge. As a result the species becomes positively charged and is known as cation.
During formation of ionic bond, metals always form a positive ion (cation) by losing electrons. These electrons are accepted by the nonmetals and they become negatively charged. A negatively charged ion is known as anion and nonmetals always form an anion.
These are attracted to each other due to the opposite charges present on them. In an ionic compound they balance the charges on each other making the compound neutral.
From the above discussion, we can fill in the blanks as follows.
A metal atom loses electrons from its outermost energy level and acquires a Positive Charge. These electrons join a nonmetal atom. The ionic compound formed because of this transfer of electrons is electrically Neutral.
 how are subscripts determine the formula of ionic and covalent compounds ?
Answer:
To determine the correct subscripts in a chemical formula, you have to solve how many atoms you need to balance the charge.
For example if I had the compound Calcium Fluoride I would look at the periodic table and see that Calcium's ionic formula is
Ca2+
. How do I know this? Well all elements want to have 8 valance electrons so they can be stable(happy). Seeing that Calcium has 2 valance electrons it is going to give away 2 electrons because that is easier than gaining 6 to be happy. Since Calcium has given away 2 electrons it has two more protons than electrons. We know that Protons have a Positive charge, Electrons have Negative charge, and the number of electrons is equal to the atomic number of an element in its pure non-ionic state. (Meaning it doesn't have a positive or negative charge; it is balanced.)
So if calcium gave away two electrons, it will have two more protons than an electron giving it a (2+) charge. The same process can be applied to Fluoride. Since fluoride is one to the left of the noble gases(group 18 or 8A) on the periodic table we know that it has 7 valance electrons because it is in group 7A or 17.
Knowing that we have 7 electrons the fluoride atom will gain an extra electron. Since the fluoride atom gained an extra electron it will have one more negative charge than a positive making it a ^(−)ion.
So you know that Calcium has a 2+ charge and that fluoride has a 1- charge, you then need these ions to balance out. So you need two fluorine atoms with a 1- ions to balance out the 2+ ion of calcium. Your final answer would be
CaF2
because you need two fluorine atoms to balance out the 2+ charge of the calcium.
Final Tip: Determine the charges then inverse the charges, remove the positive and negative superscipts, and write the charge numbers as a sub script. Ie. Calcium Fluoride
Ca2+ and F−
inversing and removing the charge signs would give you
Hot, molten rock deep below Earth’s surface is called lava mantle rock parent rock magma
Answer:
I think it is Magma
1. If humans increase the amount of carbon dioxide in Earth's atmosphere, what will
happen to the average temperature on Earth?
Answer:
The average temp will increase
Explanation:
Carbon dioxide levels will cause global warming to increase and therefore the temp will increase
Hope this helps :)
why are oxidation numbers assigned to the elements before writing a chemical formula
Answer:
Oxidation numbers assign ownership of the electrons to one atom or another in a compound. ... Scientists use these numbers to help name compounds, write formulas and balance chemical equations. They are also useful when studying reactions and they can help you identify when something is oxidized or reduced.
How acidic buffer resist change in pH on addition of acid and base.
Answer:
Buffers are solutions that resist changes in pH, upon addition of small amounts of acid or base. The can do this because they contain an acidic component, HA, to neutralize OH- ions, and a basic component, A-, to neutralize H+ ions. Since Ka is a constant, the [H+] will depend directly on the ratio of [HA]/[A-].
hope it's help
#carryONlearningwhat is the electron dot structure of AsClBr2? Pls pls pls help me
Answer:
Explanation:
Sorry, I don't really know about this. I hope it helps!
What is Magnesium phosphide cation and Anion
Answer:
Magnesium Phosphide has a formula of Mg3P2 . Magnesium is a metal cation with a charge of Mg+2. Phosphorus is a nonmetal anion with a charge of P−3. In order to bond ionically the charges must be equal and opposite
Explanation:
How many moles is 17.6 g NaOH?
Answer: The answer is 39.99711.
Explanation:
How many grams NaOH in 1 mol? The answer is 39.99711.
We assume you are converting between grams NaOH and mole.
You can view more details on each measurement unit:
molecular weight of NaOH or mol
This compound is also known as Sodium Hydroxide.
The SI base unit for amount of substance is the mole.
1 grams NaOH is equal to 0.025001806380511 mole.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between grams NaOH and mole.
Type in your own numbers in the form to convert the units!
Convert another chemical substance
Convert grams
NaOH
to moles
Quick conversion chart of grams NaOH to mol
1 grams NaOH to mol = 0.025 mol
10 grams NaOH to mol = 0.25002 mol
20 grams NaOH to mol = 0.50004 mol
30 grams NaOH to mol = 0.75005 mol
40 grams NaOH to mol = 1.00007 mol
50 grams NaOH to mol = 1.25009 mol
100 grams NaOH to mol = 2.50018 mol
200 grams NaOH to mol = 5.00036 mol
Describe why there are places on the curve where the temperature does not rise even though the burner is stil transferring energy to the ice and water.
Answer:
y
Explanation:
Part I: Multiple Choice Questlons
1. A solution is a:
a heterogeneous mixture
C suspension
b homogeneous mixture
d colloid
Answer:
A cuz a heterogeneous mixture is no uniform
Answer:
A heterogeneous mixture
The correct electron configuration is....
A)Electrons can go where they like.
B) Shell 1=2, Shell 2=8, Shell 3=8, Shell 4=18.
C) Shell 1-8, Shell 2=2, Shell 3=8, Shell 4=18
Answer:
C) Shell 1-8, Shell 2=2, Shell 3=8, Shell 4=18
How many moles of carbon tetrabromide are present in 5. 27x10`22 molecules of the compound
Answer: 0.094 mole
Explanation: same answer for any molecule, actually.
6.02214076*10^23 per mole
5.7*10^22 = 0.094 mole
Most caves form in: *
O Igneous rock
O Compacted soil
O Limestone
Sandstone
Oxygen and chlorine gas are mixed in a container with partial pressure of 401 mmHg and 0.639 atm Respectively. What is the total pressure inside the container?
Which Kingdom does the organism belong to?
Animalia
Protista
Fungi
Plantae
pls help guys
Why do you think it is necessary to break up the fat into tiny droplets?
How could you explain why soap is able to clean the oil and dirt off our bodies?
Answer:
for the first question, the context is necessary in order to answer...
Fat is immiscible (does not mix) with water because fat is nonpolar and water is polar (remember like dissolves like: polar mixes with polar, nonpolar with nonpolar).
soap bubbles by having many soap molecules surround fat molecules with their nonpolar end, and direct their polar ends outwards.
For your second question:
Dirt and oil are nonpolar. When we wash our bodies with water (which is polar) it does not do a good job in removing these nonpolar molecules. Soap, on the other hand, has a long nonpolar end and a small polar end. The nonpolar end of the soap molecule attaches to the dirt and oil on your skin and when the water from the shower head hits the soap, it pulls the dirt, oil, and soap off of you by attaching itself to the polar end of the soap molecule.
Explanation:
When a warm air mass is trapped between two (2) cold air masses, the result is a(n)?
Answer:
results in a Occluded front
if you have 58 g of Copper what is the mass of Silver nitrate?
____Cu +____AgNO3 →
____Ag+ ____Cu(NO3)2
Answer:
Add 2 to Cu in first part of problem only