Answer:
A. the iron atoms are gaining kinetic energy
Explanation:
when the iron melted and solidifies it loses potential energy and changes to kinetic energy
How much kinetic energy does a 200 Kg wrecking ball have if it is swung at 10 m/s?
A. 2000 J
B. 20 J
C. 10,000 J
D. 19,60 J
What other small steps can we take to save water ?
Answer:
Check your toilet for leaks. ...
Stop using your toilet as an ashtray or wastebasket. ...
Put a plastic bottle in your toilet tank. ...
Take shorter showers. ...
Install water-saving shower heads or flow restrictors. ...
Take baths. ...
Turn off the water while brushing your teeth. ...
Turn off the water while shaving.
Explanation:
Answer:
keeping the water clean
Explanation:
avoid dumping rubish in the water
Thank you!!! ;0;
3.00 moles of ammonia are originally put into a 1.00-liter container and allowed to decompose (no other chemicals present). At equilibrium, 0.600 moles of ammonia remained in the reaction vessel. What would be the equilibrium constant (K) for this reaction?
2 NH3(g) N2(g) + 3 H2(g(
Answer:
Kc ≅ 100 (1 sig. fig.)
Explanation:
2NH₃(g) ⇄ N₂(g) + 3H₂(g)
C(i) 3.00 mol/L 0 0
ΔC -2x +x +3x
C(eq) 0.600 mol/L x 3x
3.00 - 2x = 0.600 => x = 3.00 - 0.600/2 = 1.2 mole/L
At equilibrium Kc = [N₂][H₂]³/[NH₃]² = (x)(3x)³/(3·1.2)² = (1.2)(3.6)³/(0.600)² = 155.52 (calculator)
Rounds to 1 sig. fig. based on given 3.00 moles NH₃(g)' Kc ≅ 100.
If a chemist dilutes 2L of 0.700M solution to 3 L what will be the new concentration (M)?
Answer:
0.233M
Explanation:
M1 = 0.700M
V1 = 2L
V2 = 3L
M2 = ?
M1V1 = M2V2
(0.700)(2) = M2(3)
M2 = 0.233M
If the reaction was reversed and we wanted to produce as much NaN3, in grams, as possible from 30.0 g of N2 and 20.0 g of Na, which reactant would be the limiting reactant? (4 points) How much NaN3 would actually be produced?
Answer:
N₂
Explanation:
Sodium is a larger molecule with a much higher molecular weight. However, 20g of N₂ would be a smaller amount of molecules than 20g of sodium due to how there are multiple nitrogen molecules.
2/3 * given mass of N₂ = mass of N₃
N₃ (Azide ion) given mass = 20g
Na = 20g
Masses of chemicals are equal
Na = 22.990g/mol
20g/22.990g/mol = 0.8699mol of Na
N₃ = 20g
N₃ = N g/mol x 3
N = 14.007 g/mol
14.007 x 3 = 42.021 g/mol
N₃ = 42.021g/mol
20g/42.021g/mol = 0.4759 mol of N₃
Notice how there are fewer moles of the Azide ion than the Sodium.
0.4759 moles of NaN₃ is produced
combine molecular weights:
42.021 + 22.990 = 65.011 g/mol
multiply by amount of moles of the limiting reactant:
0.4759 mol *65.011 = 30.942 g
Also, here is the balanced equation:
3N₂ + 2Na = 2NaN₃
The results are the same as the balanced equation.
how many moles of aluminum are produced from 4.9 moles of lithium?
Answer:
2.95078 × 10^23
hope this helps you ☺️☺️
Scientist have genetically altered a common virus so that it can Destroy the most lethal type of brain tumor without harming the healthy tissue nearby this technology is used for all expect
Answer:
The correct answer is - discovering or diagnosing the disease.
Explanation:
According to the question, this technology includes genetically modifying a common virus in order to destroy or kill the deadly brain tumor without affecting normal cells around the tumor, this technique is genetic engineering.
This technique can help in treating or curing the disease by killing the tumor cells and make them non-lethal. It can also prevent the tumor cells to grow and make them controlled. There is nothing mention related to diagnosing the disease in the question and it is not possible to find this tumor with help of such a technique.
Fe + O2 —> Fe2O3
can someone pls help me balance this??
Answer:
4Fe + 3O2 → 2Fe2O3
how to find resistance of a color code with 4 rings?
Answer:
its yellow
Explanation:
it's a constant law .... much explanation
from 0 to 9
we have
black .o
brown 1
red 2
orange 3
yellow 4
green 5
blue 6
violet 7
grey 8
white 9
The shells further away from the nucleus are larger/smaller and can hold more/less electrons.
Which one is the right one? Larger/smaller? More/less?
What is the molar mass of CH 4 ? (C = 12.01g / m * o * l, H = 1.008g / m * o * l)
What is the role of Cl2 in the following
reaction?
CL + NaOH Nacl+ NaCO3+H2O
Answer:
Cl2 acts as an oxidizing agent
Explanation:
The balanced equation is
Cl2+NaOH⟶NaCl+NaClO3+H2O
Cl2 acts as a reactant in this chemical reaction
Cl2 receives one electron and thus reduces itself from Cl2 to 2 Cl−. This indicates that 2Cl- will oxidize some other element and hence Cl2 act as an oxidizing agent.
At 39 °C, a gas occupies 45.5 mL. If the temperature is cooled to 2 °C,
what will the new volume be? *
1. 51.6 mL
2. none of these
3. 40.1 mL
4. 3.90 x 105 mL
salt plus water. two compounds mixed together to form a solution. The water is the solvent; the salt is the solution. students have been tasked with separating the two compound from solution.
Answer:
Evaporation
Explanation:
Students are to mix the solvent to dilute completely,and get and evaporation dish,candle(heat),tripod stand...pour the solution in the evaporation dish and place it on tripod stand above the candle wait for some time the water will change into gas and to get the water they have to cover the evaporating and direct it to a different container to get the water and salt
what 3 things does cell division allow cells to do?
(there r no answer choices)
Answer:
Cell division is central to organism growth, reproduction and tissue repair.
Explanation:
Hope this helps!
Answer:
multiply, survive grow
What is the mole to mole ratio of LiOH to HBr for the following reaction?
LiOH + HBr --> LiBr + H2O
How many moles are in 10.00g HBr?
Explanation:
so moles = mass ÷ mr (1+ 79.9)
so 10.00g ÷ 80.9
which is 0.1236093943
so to 3 S.F is 0.124 moles
also there is 1 to 1 ratio for LiOH to HBr
hope this helps :)
Please help me with this chem question. Only answer if you know it.
Answer:
solid=(s)
Explanation:
A solubility table may be something your class may want you to memorize. Where an aqueous (aq) solution is formed by a soluble compound dissolving in water, our solvent. So if we refer to this solubility table, it says phosphate (PO4) is usually insoluble, so in the reaction it won't break down in water and will stay as a solid (s). The only exceptions are group 1 alkali metals or ammonium (NH4+).
2. If 7.82 mol of nitrogen, N2, are reacted with excess hydrogen, what is the theoretical
yield of ammonia, NH3, in moles?
What is the percent yield of NH3 if the actual yield is 12.8 mol?
Answer:
15.64 moles
81.8% (3 s.f.)
Explanation:
Let's start by writing a balanced equation.
N₂ +H₂ → NH₃
To balance the equation, ensure that the number of atoms of each element is the same on both side of the arrow. On the left, we have 2 N atoms and only 1 N on the right. Thus, write '2' in front of NH₃ to balance the N.
N₂ +H₂ → 2NH₃
Now, balance the number of H atoms. Currently, there are 2 Hs on the left and 6 Hs on the right. To balance the equation, write a 3 in front of H₂.
N₂ +3H₂ → 2NH₃
The equation is now balanced.
[tex]\boxed{N₂ +3H₂ → 2NH₃}[/tex]
Given that hydrogen is in excess, the number of moles of NH₃ is dependent on the number of moles of N₂, which is the limiting reactant.
The mole ratio of N₂ to NH₃ produced is 1: 2.
Thus with 7.82 mol of N₂,
number of moles of NH₃
= 2(7.82)
= 15.64 moles
This is the theoretical yield since the calculations were based from the chemical equation.
However, in reality, the percentage yield may not be 100% as some products are lost in the process.
[tex]\boxed{percentage \: yield = \frac{actual \: yield}{theoretical \: yield} \times 100\%}[/tex]
∴ Percentage yield of NH₃
[tex] = \frac{12.8}{15.64} \times 100\%[/tex]
= 81.8% (3 s.f.)
Name the following alkane molecule (picture)
A.) 2-methyl-3-broom-5-ethyloctane
B.) 3-bromo-5-ethyl-2-methyloctane
C.) 3-bromo-5-ethyl-2,7-dimethylheptane
Answer: B. 3-bromo-5-ethyl-2-methyloctane
Explanation:
The correct name of the compound as we can see is 3-bromo-5-ethyl-2-methyloctane.
What is IUPAC nomenclature?The IUPAC nomeclature shows the standard,, approved pattern for naming organic compounds. As a matter of fact it is intended to enable pratitioners to write the name of a compound from structure.
The correct name of the compound as we can see is 3-bromo-5-ethyl-2-methyloctane.
Learn more about IUPAC nomeclature: https://brainly.com/question/14356798
Use the masses of the elements below to calculate the mass of 8.70 moles of H3M (the number at the bottom of
each square is the atomic mass of that element)
1
2
3
4
5
6
A
H
C
B
M
Sm
aragon
hillsdale
capuchino
mills
burlingame
san mateo
1.10
3.50
7.09
11.22
15.23
18.98
Given:
Wanted
Relationship: 1 mole H3M =
grams
Final answer
grams
yes use the masses of an element below calculate the mass of it 8.70 mole of each 3M
What is something YOU can do Today to help preserve our Mother Earth??
Answer:
I would recycle, reuse, and reduce the litter on this already hurt Earth.
Explanation:
Answer:
I can go out and help pick up garbage and i can recycle and not litter and i can reuse all the plastic water bottles i drink.
Explanation:
Im glad you care about mother earth to
what is the compound name for Cu(OH)2
Answer:
Copper hydroxide is the correct answer.
Explanation:
Hope this helped Mark BRAINLIEST!!!
What’s an easy way to learn to convert metric numbers? Help plz
Explanation:
HOPE IT HELPS
THANKS
Zn + 2HCI → ZnCl2 + Hz
3. How many moles of hydrogen, H2, will be produced if 0.95 moles of zinc, Zn, reacts
with 6.2 moles of HCI? (Hint: Must determine limiting reactant.)
Answer:
0.95 moles
Explanation:
I believe that this is the equation we are looking at since this is an acid- metal reaction, thus the products would be a salt and hydrogen gas (H₂):
Zn +2HCl → ZnCl₂ +H₂
The limiting reactant is the reactant that we do not have enough of for the reaction to continue. From the balanced equation, the mole ratio of Zn to HCl is 1: 2. This means that for every 1 mole of Zn, 2 moles of HCl is needed.
Let's calculate the number of moles of HCl needed to react with 0.95 moles of Zn.
Number of moles of HCl required
= 0.95 ×2
= 1.9 moles
Since we have 6.2 moles of HCl, HCl is in excess and thus Zn is the limiting reactant. For 6.2 moles of HCl, 3.1 moles of Zn would be needed but we only have 0.95 moles.
For every 1 mole of Zn, 1 mole of H₂ is produced.
Thus, since 0.95 moles of Zn has reacted,
number of moles of H₂ produced= 0.95 moles
Need this less than 4 minutes!! In which step do we see the chromosomes condense and meet up to form homologous pair?
Metaphase II Metaphase I Anaphase II Prophase I Prophase II
Answer:
Prophase I
Sorry if wrong I was rushing !!
If+a+substance+has+a+half+life+of+520+years,+and+you+start+off+with+1,000+g+of+it.+it+is+the+year+2021,+how+much+will+i+have+left+in+the+year+3061
Answer:
[tex]A=250g[/tex]
Explanation:
Hello there!
In this case, by considering the radioactive decay as a first-order kinetic model:
[tex]A=Ao*exp(-kt)[/tex]
We can firstly calculate the rate constant given the half life:
[tex]k=\frac{ln(2)}{t_{1/2}} =\frac{ln(2)}{520years}=1.33x10^{-3}years^{-1}[/tex]
Thus, we can plug in the elapsed time and the initial amount Ao to obtain:
[tex]A=1,000g*exp[-1.33x10^{-3}years^{-1} *(3061-2021)years]\\\\A=250g[/tex]
Best regards!
2. The development of microscopes allowed scientists to investigate living things in greater detail. Through many investigations, scientists found evidence that all living things are made of one or more basic units that divide to form new units. Scientists used their evidence to explain the relationship between these “building blocks of life” and the organisms to which they belong. What are these explanations called?
a) Cell theory
b) Germ theory
c) Law of mitosis
d) Law of biogenesis
Answer:
a) Cell theory
Explanation:
Cell theory states that cells are the basic unit of life
Which of the following reactions below could be properly categorized as a synthesis reaction?
Answer:
A synthesis reaction is a type of reaction in which multiple reactants combine to form a single product. Synthesis reactions release energy in the form of heat and light, so they are exothermic. An example of a synthesis reaction is the formation of water from hydrogen and oxygen.
You mix 35mL of 0.54M NaI with 14mL of 0.84M Pb(NO3)2. How many grams of the precipitate will be created?
how does meiosis differ from meiosis
During meiosis 1, the parent cell with double the normal amount of chromosomes, splits into two diploid cells (have enough chromosomes to survive). During meiosis 2, the two diploid cells each split into two haploid cells (have half the amount of chromosomes to survive). Meiosis ends with four haploid cells.