Answer:
red
Explanation:
rojo yyyyy888888iiiiii
What mass of aluminum is required if 40.0 grams of iron (III) oxide is to be completely consumed as
shown in the following reaction? (NO CALCULATOR) Fe2O3(s) + 2Al(s) → 2Fe(l) + Al2O3(s) (A) 13.5 g (B) 27.0 g (C) 40.0 g (D) 67.0 g
Answer:
13.5
Explanation:
Molar mass of Fe2O3 = 2*56 + 16*3 = 112 + 48 =160 approximate value
Number of moles of Fe2O3 = mass/molar mass = 40/160 = 0.25 mol
The reaction is balanced. Fine
1 mol of Fe2O3--------> 2 mol of Al
0.25 mol--------> 0.25*2 = 0.5 mol of Al
Mass of Al required = Number of moles * Molar mass
= 0.5 * 27 = 13.5 g
How would this be written as a formula? 6 molecules of water *
Answer:
either 1 or 3
Explanation:
brain
An atom has atomic number 11 and mass number 23. How many electrons does the atom have?
Answer:
11
Explanation:
The number of electrons is the same as the number of protons. Protons are the atomic number.
How many atoms of each element are in 4Na3PO4?
3 sodium, 1 phosphorus, 4 oxygen
4 sodium, 4 phosphorus, 4 oxygen
12 sodium, 1 phosphorus, 4 oxygen
12 sodium, 4 phosphorus, 16 oxygen
Answer:
12 sodium, 4 phosphorus, 16 oxygen
Explanation:
4Na3PO4
Has (4X3) Na ,( 4X1) P ,(4X4) O
Answer:
12 sodium, 4 phosphorus, 16 oxygen
DDDDDDDDDDDDD
Explanation:
5.0 x 104 ml of gasoline is added to a boat that weighs
4.5 kg. What will be the mass of the boat with the added gasoline?
Answer:
ml can not be kg because ml is volume
is shaking a can of soda a physical or chemical change?
Answer:
Chemical, the foaming of the ingredients makes it a chemical reaction
Explanation:
hope this helps
could anyone give me the answer to this plz 20 points
what materials can a arch bridge be made of?
Answer:
Stone, brick,
Explanation:
When you are conducting a controlled experiment, what variable are you as the scientist manipulating and testing?
A. independent variable
B. dependent variable
C. controlled variable
D. uncontrolled variable
Answer: It’s A because you change the independent variable to conduct an experiment and get accurate results.
Explanation:
Answer:
The correct answer would be A
Explanation:
I did the test :)
An ant is about 4.0 mm long. How many feet is this?
Answer: about 0.013 feet
Explanation:
well there’s about 0.003 foot in a mm
3AsBr3 how many atoms
Answer:
there are 18
Explanation:
What is SI unit and it's advantage
Which of the following kinds of cells perform basic functions such as obtaining energy from food
Complete question is;
Which of the following kinds of cells perform basic functions such as obtaining energy from food?
A) Plant cells, but not animal cells
B) Animal cells, but not plant cells
C) Both plant cells and animal cells
D) Neither animal cells nor plant cells
Answer:
Option C: Both plant cells and animal cells.
Explanation:
Correct Answer is;
Option C: Both plant cells and animal cells.
This is because both plant and animal cells need food for survival as food gives energy for movement and work operations.
Other options are not correct because they infer that either cell or none of them obtains energy from food which is false.
Which would be an example of a compound?
oxygen
carbon dioxide
sand
carbon
Answer:
carbondioxide is an example of compound.
Covalent bond occur between which groups of elements?Immersive Reader
a-Non-metals and Metalloid
b-Metals and Non-metals
c-Non-metals and Non-metals
d-Metals and Metalloid
Which of these elements would have the largest atomic radius?
Answer:
It is Li FOR SURE
Explanation:
Answer:it’s Li
Explanation:
URGENT !!!!!! Which property would vary between two different- sized samples of the same substance ( meaning it is size dependent )
A. Volume
B. Solubility
C. Magnetism
D. Conductivity
Answer:
I think the answer would be A.
Explanation:
Solubility property will vary between two different- sized samples of the same substance.
What is solubility?
Solubility is a physical process in which solute particles are dissolved in the solvent substance for the formation of solution.
Solubility is related to the size of the particles as the more surface area shown by the particles more easily they will dissolve in the solvent.Volume is generally related to the liquid, but here we are talking about particles so it is not correct.Magnetism and conductivity is related to electrons not to the size.Hence the property solubility will vary between two different- sized samples.
To know more about solubility, visit the below link:
https://brainly.com/question/16903071
#SPJ2
Determine the number of moles of oxygen gas (O2) that are needed to react with 0.725 moles of aluminum (Al).
4Al (s) + 3O2 (g) ⟶ 2Al2O3 (s)
Given :
Oxygen gas ([tex]O_2[/tex]) that are needed to react with 0.725 moles of aluminum (Al).
[tex]4Al(s)+3O_2(g)->2Al_2O_3(s)[/tex]
Solution :
4 moles of Aluminium react with 3 moles of oxygen,
Let, moles of oxygen react with 0.725 moles of Al is x.
[tex]x=\dfrac{0.725\times 3}{4}\\\\x=0.54375\ moles[/tex]
Hence, this is the required solution.
The number of moles that should be required to react is 0.54375 moles.
Calculation of the number of moles:Since There are 0.725 moles of aluminum (Al)
And, there is the chemical equation 4Al (s) + 3O2 (g) ⟶ 2Al2O3 (s)
The above equation represent 4 moles of Aluminium should be react with 3 moles of oxygen.
So, the number of moles should be
= 0.725 * 3/4
= 0.54375 moles
Therefore, The number of moles that should be required to react is 0.54375 moles.
Learn more about moles here: https://brainly.com/question/19462659
solid liquid gas or plasma
Answer:
I believe its gas
Explanation:
because it has no symbolic bonds
I am not sure with the answer but I think the answer is solid.
Which of the following are examples of chemical changes?
change in composition
a substance decomposing
burning
melting
Answer:
change in composition
a substance decomposing
burning
Explanation:
A chemical change is one in which a new kind of matter is formed. It is always accompanied by energy changes (evolution or absorption of energy in form of heat or light or both).
This process is often irreversible.
Chemical changes involves changes in mass. It requires considerable amount of energy. It leads to the production of new kinds of matterNow, processes such as burning and decomposition are chemical changes and are not easily reversible.
Since new kind of matter is formed, there is a change in composition.
Melting is a physical change that is easily reversed.
Other examples of chemical changes are rusting of iron, precipitation and souring of milk.
Answer: 1 change in composition 2 a subtance decomposing 3 burning
can a sample of methane contain 1577 atoms?
I need help plsssssssssssssss
Answer:
B
Explanation:
Where on the table would a group's
ionization energy be the greatest?
Answer:
upper left
Explanation:
it is a trend on the periodic table. Ionization energy increases from left to right(->) I t also increases down to up
Answer:
right
Explanation:
If you are doing this on usatestprep its on the right side
(Brainliest) Please Help! Please do not give me a random, gibberish answer or I will report you and give you a low rating therefore dropping your popularity. Also, if you don't know the answer you can put your guess in the comments. I will give a Brainliest and 50 points!
What mass of KBr is present in 20.0 mL of 15.5% (m/v) KBr solution?
Answer:
3.10g
Explanation:
Please see the attached picture for the full solution.
What is the acceleration of a 10kg object if a force of 3N is applied to it
Answer:
0.3kg/min
Explanation:
The formula for acceleration is a = f/m where f = force and m = mass.
a = 3/10
a = 0.3
Best of Luck
A sample of ethanol has a volume of 7.5 mL and a mass of 5.85 g. A sample of benzene also has a volume of 7.5 ml,
but has a mass of 6.60 g. Which liquid is denser
Answer:
Benzene
Explanation:
You need to calculate the densities for each compound.
EtOH = 5.85/7.5 = 0.78 g/mL
Benzene = 6.60/7.5 = 0.88 g/mL
0.88 > 0.78, thus benzene is denser than ethanol.
Answer:
Benzene is denser than ethanol.
Explanation:
Given data:
Volume of ethanol = 7.5 mL
Mass of ethanol = 5.85 g
Volume of benzene = 7.5 mL
Mass of benzene = 6.60 g
Which is denser = ?
Solution:
First of all we will calculate the density of both substances.
Density of ethanol:
d = m/v
d = 5.85 g/ 7.5 mL
d = 0.78 g/mL
Density of benzene:
d = m/v
d = 6.60 g/ 7.5 mL
d = 0.88 g/mL
The density of benzene is higher thus it is denser than ethanol.
The world's tallest artificial Christmas tree measured a mammoth 5.20 x 103 cm. How tall is the tree in kilometers?
Answer:
0.005356
Explanation:
Sam has a sample of water and a sample of carbon dioxide gas. Which sample is compressible?
Carbon dioxide
Neither
both
Water
Answer:
Carbon Dioxide
Explanation:
URGENT This is due at 8:30! Help fast !!!!!!!
Gold has a density of 19.3 g/cm^3, and a volume of 17.78 cm x 9.21 cm x 4.45 cm. What is the mass of 3 gold bars ? Please explain your answer
m/v=19.3
m/17.78×9.21×4.45=19.3
19.3×17.78×9.21×4.45=m
3m=2,186.11323g
An object of indeterminate size marking a
location in space
Answer:
Point
Explanation:
An object of indeterminate size which marks a location in space is called a point.
A point in geometry has no dimension unlike a line which is one dimensional. In essence, like other bodies, we cannot specify any of the width, length or height of a point.
Points are usually shown with dots. It has no width, length, breadth and other attributes that specifies it. Angle at a point is taken as 360° which is the same as the angle in a circle.On the other hand, a line is a connects two or more points and it is one dimensional. They usually have lengths.
Therefore, an object of indeterminate size which marks a location in space is a point.
