Fe2O3 (s) + 2 Al (s) ---> 3 Fe (l) + Al2O3 (s) Based on the thermite reaction, how much aluminum oxide (Al2O3) is formed from 8.0 grams of aluminum (Al)?
Answer:
15.3 g
Explanation:
Fe₂O₃ (s) + 2Al (s) → 3Fe (l) + Al₂O₃ (s)First we convert 8.0 grams of aluminum into moles, using its molar mass:
8.0 g Al ÷ 27 g/mol = 0.30 mol AlThen we convert 0.30 moles of aluminum into moles of aluminum oxide, using the stoichiometric coefficients:
0.30 mol Al * [tex]\frac{1molAl_2O_3}{2molAl}[/tex] = 0.15 mol Al₂O₃Finally we convert 0.15 moles of Al₂O₃ into grams, using its molar mass:
0.15 mol Al₂O₃ * 102 g/mol = 15.3 g Al₂O₃I NEED HELP PLZZ THX <3
Question 16
A hockey puck is hit with a large force. The puck moves at a high speed as it slides over the ice.
What happens according to Newton’s first law of motion?
A) The puck does not lose any speed because ice is a very slippery surface.
B) The puck gradually slows down because mass makes objects slow down.
C) The puck gradually slows down because friction would be acting on it.
D) The puck does not lose any speed because once an object starts moving, the force of friction would no longer apply to it.
Answer:
C) The puck gradually slows down because friction would be acting on it.
Explanation:
It would be C because the puck would be scraping the ice and when it's scraping it slowly losses its speed because the ground is pushing it lightly
Hoped that helped :/
For a theoretical yield of 5.52 g and percent
yield of 51.7877%, calculate the actual vield
for a chemical reaction.
Answer in units of g.
Answer:
2.85868104g
Explanation:
Actual yield
Theoretical yield x 100 = 51.7877%
So, do the inverse and you get 2.85868104g
I need help with energy
Answer:
Explanation:
The correct answer is
energy resulting from the flow of charged particles , such as electrons or ions.
hope it helps :)
Solid potassium chloride is obtained by the reaction of solid potassium and chlorine gas.
Write a balanced chemical equation for this reaction.
Answer:
2 K(s) + Cl₂ (g) --> 2 KCl(s)
Explanation:
Potassium will just be K
Chlorine gas is part of BrIClHOF, which are diatomic gasses. So Cl₂
Looking at the periodic table potassium K has an ion charge of +1 and chlorine Cl has an ion charge of -1, so in a balanced compound they will be written as KCl
Balancing the amounts of each will lead to 2 K(s) + Cl₂ (g) --> 2 KCl(s)
Help! Please and thank you
The equation for the complete combustion of ethene (C 2 H 4 ) is C 2 H 4 + 3O 2 2CO 2 + 2H 2 O If 2.70 mol of C 2 H 4 reacted with 6.30 mol , O 2 a. Identify the limiting reagent. b. Calculate the moles of water produced .
Answer:
22
Explanation:
Lithium nitride consists of two ions chemically bonded together. What are the charges of each ion?
O A. Li^3- and N^+
O B. Li^+ and N^3-
O C. Li^3+ and N^-
O D. L^i- and N^3+
Answer:he’s right
Explanation:
Lithium nitride is the only alkali metal nitride which has the chemical formula Li₃N and it reacts with water to produce ammonia and lithium hydroxide. The charges of each ion are +1 and -3. The correct option is B.
What are cations and anions?The ions which are positively charged are called the cations whereas the ions which are negatively charged are called the anions. The combination of the cations and anions results in the formation of an ionic compound.
In lithium nitride, the cation is Li⁺ and the anion is N³⁻. The charge on the nitride ion is -3 and that of the lithium ion is +1. The total number of electrons present in the molecule is 10. Because the number of protons is 7 and 3 electrons were added from -3 on the nitride ion.
Thus the correct option is B.
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answer quick plssssssssss
what is atomic number of sodium
Answer:
Explanation:
Sodium is a chemical element with the symbol Na and atomic number 11. It is a soft, silvery-white, highly reactive metal. Sodium is an alkali metal, being in group 1 of the periodic table. Its only stable isotope is ²³Na. The free metal does not occur in nature, and must be prepared from compounds.
Answer: Atomic number for sodium is 11
Symbol: Na
Melting point: 207.90°F (97.72°C)
The electronic configuration of sodium is 2, 8, 1
What holds more salt warm or cold water?
Why do some animals defend their territory after they have mated
and reproduced?
a.They can gain more food for their offspring
b.they can provide a larger nest for their offspring.
c.They are naturally aggressive.
d.They are carrying out a mating dance.
Answer:
i believe it is a
Explanation:
The reason is :a.They can gain more food for their offspring
Animals tend to protect their territory because they don't want intruders to invade their territory.
Animals majorly protect their territory in order to protect their foods from been eating by intruders as this will enables their offerings to have enough foods to eat.
They as well guard their territory in order to prevent intruders from invading the place they have prepare as their mating place.
Inconclusion The reason why some animals defend their territory after they have mated
and reproduced is :a.They can gain more food for their offspring
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PLEASE HELP ME.!
This illustrates which stage of meiosis?
A) Anaphase II
B) Metaphase II
C) Prophase II
D) Telophase II
Answer:
Anaphase II
Explanation:
The battery gets it's energy from the
Humans become part of the carbon cycle when they
A. breathe in carbon dioxide,
B. release carbon as a waste product,
C. produce new carbon compounds in their cells,
Answer:
Human activities have a tremendous impact on the carbon cycle
Explanation:
Burning fossil fuels, changing land use, and using limestone to make concrete all transfer significant quantities of carbon into the atmosphere. ... The ocean absorbs much of the carbon dioxide that is released from burning fossil fuels.
Covalent bonds form due to the attraction between _____.
a positive atomic nucleus and a negative one
the nuclei of two atoms
the electrons of two atoms
the electrons of one atom and the nucleus of another
Answer:
the electron of one atom and the nucleus of another
Do all mutations have the same affect on a cells dna
Answer:
no, some mutations can create cancers while others can create other infections
Explanation:
A doctor tapes a patients knees with a hammer to test the reflex which can provide information about the condition of the _____
Answer:
lol this is what you get for not answering my question and stealing points
Explanation:
If I touch a hot object, my hand gets hot through which type of heat transfer?
Answer:
Thermal Transfer.
Explanation:
If you touch a hot object, the heat is transferred from the object to your hand through conduction. (This is the actual answer.)
How much heat is needed to warm 250g of water from 22℃ to 98℃?
Answer:
Thus, the required heat is 79kJ 79 k J .
Explanation:
i think its the right bottem one
135 g of aluminum initially at 400.°C is added to an unknown mass of water (initially at 25°C). When thermal equilibrium is reached, the system has a temperature of 80.°C. Find the mass of water. Note c = .89 J/g°C for Al
Answer:
981.82g or 0.982 kg
Explanation:
I believe this is Physics, but okay!
We have to use the Specific Heat Capacity formula here.
Heat energy = mass x specific heat capacity x change in temperature
mass = Heat energy/(specific heat capacity x change in temperature)
Heat energy is measured in Joules so we need to find out how to do this.
To find an amount in Joules, we are given 135g and 0.89J/g°C.
135g x 400°C = 54000 to give us g°C
54000 x 0.89 = 48060 By multiplying these two values, we get given 48060J.
This is because: g°C/1 x J/g°C = Joules on it's own
mass = (48060)/[0.89 x (80 - 25)]
mass = 981.82g
How
much heat must be added to
85g
of water
to raise its temperature 225?
Answer:
One of water's most significant properties is that it takes a lot of heat to it to make it get hot. Precisely, water has to absorb 4,184 Joules of heat (1 calorie) for the temperature of one kilogram of water to increase 1°C.
Explanation:
is butanoic acid a hydrocarbon?
What is the pOH if the [OH-]= 0.165 M? What is the pH of this basic solution? *Please round your answer(s) to the appropriate number of significant figures. Your answer can be in standard notation or i letter "e" in place of x10.* 1 N
Answer:
78
Explanation:
Answer:
The OH would be .7825 and the basic solution is a strong base.
Explanation:
What you would do is -log(0.165) in your calculator which would give you 0.7825160065 as an answer. Im not sure what the significant figure is so I will not be rounding to that, but that is your answer for the first part.
The second part: because your pOH is a .7825, this would be consiered a strong base in the pOH because it is closer to 1 which is your base.
What is the missing word. Please Help Me. Thank you!!
Before adding to the cell, aluminium oxide is mixed with _____________ to lower its melting point.
Which statement does NOT describe a relationship shown in the food web?
A Elk are prey for mountain lions.
B Mice are herbivores that consume grasses and are preyed on by snakes.
COwls prey on rabbits and frogs.
Rabbits consume shrubs and are parasites of grasses.
D
PLEASE HELP
Can anyone help me with this algebraic expression
(4a+3b)² (3a-4b)²
Answer:
=144a⁴−168a³b−239a²b²+168ab³+144b⁴
Explanation:
=144a⁴−168a³b−239a²b²+168ab³+144b⁴
Answer:
[tex](4a + 3b)(4a + 3b)(3a - 4b)(3a - 4b) \\ {16a}^{2} + 12ab + {9b}^{2} + 12ab + {9a}^{2} + 12ab + 12ab + {16b}^{2} \\ {16a}^{2} + {9a}^{2} + {9b}^{2} + {16b}^{2} + 12ab + 12ab + 12ab + 12ab \\ {25a}^{2} + {25b}^{2} + 48ab[/tex]
HELP PLEASE❗️❗️‼️
An increase in temperature is an increase in.... ( there are two correct answers)
A.) Water molecules
B.) The melting point
C.) pressure
D.) Fun
Which formula represents a hydrate compound?
Answer:
H2O2
Explanation:
There's hydrogen and ox in the formula to represent
How much H2O is produced when 40000 g of
C2H, burns completely?
Answer in units of g.
Answer:
1200g H20.
Explanation:
Write out the balanced equation... when an organic compound is burned, like C2H2, it is burned in oxygen (O2) and produces Water and Carbon Dioxide (CO2)
so 2C2H2 + 5O2 = 2H2O + 4CO2
now that you have a balanced equation just convert to moles and solve
2000g C2H2 * 1mol C2H2 / 30gC2H2 * 2mol H2O/2mol C2H2 * 18gH2O/1molH20 = 1200g H20.