Answer:
False
Explanation:
A change of state is not an example of a chemical reaction.
A chemical reaction cannot be reversed. This example however, can be. You can melt the wire down and them form it back into iron pellets
Answer:
False
Explanation:
The key to a chemical reaction is "irreversible change". If you can change it back to what it was before, it's not a chemical reaction. This is an example of a physical change.
give an example of biotic living conditions.
Answer:
plants and animals
Explanation:
Answer:
water, light, wind, soil, humidity, minerals, gases
Explanation:
i just know
At what temperature will 1.50 moles of nitrogen exert a pressure of 1.072 atm in a 20.0 L cylinder?
238 K
0.00574 K
337 K
174 K
Answer:
174 K
Explanation:
To answer this question we will use the PV=nRT formula, where:
P = 1.072 atmV = 20.0 Ln = 1.50 molR = 0.082atm·L·mol⁻¹·K⁻¹T = ?We input the data given by the problem:
1.072 atm * 20.0 L = 1.50 mol * 0.082atm·L·mol⁻¹·K⁻¹ * TAnd solve for T:
T = 174 KMeaning the correct answer is the fourth option, 174 K.
3.15 mol of an unknown solid is placed into enough water to make 150.0 mL of solution. The solution's temperature increases by 19.21°C. Calculate ∆H, in kJ/mol, for the dissolution of the unknown solid. (The specific heat of the solution is 4.184 J/g･°C and the density of the solution is 1.20 g/mL).
What is the total number of oxygen atoms on the left-hand side of this chemical equation?
2 Caz(PO4),(s)+48i0,(s) +12C(s) - 4 Casio2(3)+P4($)+12CO(g)
Answer:
Is the answer eight atoms
How many atoms are present in one formula unit of barium acetate, Ba(C2H302)2?
Answer:
i think 15
Explanation:
Answer: About Barium Acetate
All metallic acetates are inorganic salts containing a metal cation and the acetate anion, a univalent (-1 charge) polyatomic ion composed of two carbon atoms ionically bound to three hydrogen and two oxygen atoms (Symbol: CH3COO) for a total formula weight of 59.05. Hopefully i helped
Explanation:
How many joules are needed to heat 20.0 g of Au from 10°C to 50°C?
show work
Answer:
297 J
Explanation:
The key to this problem lies with aluminium's specific heat, which as you know tells you how much heat is needed in order to increase the temperature of 1 g of a given substance by 1∘C.
In your case, aluminium is said to have a specific heat of 0.90Jg∘C.
So, what does that tell you?
In order to increase the temperature of 1 g of aluminium by 1∘C, you need to provide it with 0.90 J of heat.
But remember, this is how much you need to provide for every gram of aluminium in order to increase its temperature by 1∘C. So if you wanted to increase the temperature of 10.0 g of aluminium by 1∘C, you'd have to provide it with
1 gram0.90 J+1 gram0.90 J+ ... +1 gram0.90 J10 times=10×0.90 J
However, you don't want to increase the temperature of the sample by 1∘C, you want to increase it by
ΔT=55∘C−22∘C=33∘C
This means that you're going to have to use that much heat for every degree Celsius you want the temperature to change. You can thus say that
1∘C10×0.90 J+1∘C10×0.90 J+ ... +
What is the phase label on CI?
A. aq
B.
C. e
D. g
E. s
Answer:
Pubic hair smells bad
Explanation:
Identify what the element is on the periodic table
aluminium containers are used to store and transport nitric acid(HNO3) but not NAOH why?
Answer:
(i) Concentrated HNO3 can be stored and transported in aluminium containers as it reacts with aluminium to form a thin protective oxide layer on the aluminium surface. This oxide layer renders aluminium passive. (ii) Sodium hydroxide and aluminium react to form sodium tetrahydroxoaluminate(III) and hydrogen gas.
Which phrase describes a compound that consist of two elements
Carbon dioxide, nitrous oxide, and methane are all compounds that consist of two elements
What is the mass of 5.55 moles of carbon monoxide
Answer:
[tex]\boxed {\boxed {\sf 155 \ g\ CO}}[/tex]
Explanation:
To convert from moles to mass, the molar mass must be used.
First, write the chemical formula for carbon monoxide. Since the carbon (C) comes first without a prefix, there is 1 carbon atom. The prefix mono- before oxide means 1, so there is also 1 oxygen (O) atom. The formula is CO.
Next, look up their molar masses on the Periodic Table.
C: 12.011 g/mol O: 15.999 g/molSince there is 1 atom of each, the molar masses can be added.
CO: 12.011 g/mol + 15.999 g/mol = 28.01 g/molUse this molar mass as a ratio.
[tex]\frac {28.01 \ g \ CO} {1 \ mol \ CO}[/tex]
Multiply by the given number of moles:5.55
[tex]5.55 \ mol \ CO *\frac {28.01 \ g \ CO} {1 \ mol \ CO}[/tex]
The moles of carbon monoxide cancel.
[tex]5.55 * \frac {28.01 \ g \ CO} {1 }[/tex]
Multiply.
[tex]155.4555 \ g \ CO[/tex]
The original measurement of moles has 3 significant figures, so our answer must have the same. For the number we calculated, it is the ones place. The 4 in the tenths place tells us to leave the 5.
[tex]155 \ g\ CO[/tex]
5.55 moles of carbon monoxide is about 155 grams.
PLEASE ANSWER True or False: When adding reactions together to get a desired reaction you must also add their enthalpies to get the enthalpy of that desired reaction.
Answer:
true
Explanation:
A typical coal-fired electric generating plant will burn about 3 metric tons of coal per hour. Most of the coal burned in the United States contains 1 to 4 % by weight sulfur in the form of pyrite, which is oxidized as the coal burns: 4FeS2(s) 11 O2(g) 2 Fe2O3(s) 8 SO2(g) Once in the atmosphere, the SO2 is oxidized to SO3, which then reacts with water in the atmosphere to form sulfuric acid: SO3(g) H2O(l) H2SO4(aq) If 61.7 metric tons of coal that contains 1.20 % by weight S is burned and all of the sulfuric acid that is formed rains down into a pond of dimensions 397 m x 258 m x 5.64 m, what is the pH of the pond
Answer:
the pH of the pond is 4.0963
Explanation:
Given the data in the question;
4FeS₂(s) + 11O₂(g) ------> 2Fe₂O₃(s) + 8SO₂(g)
and oxidation of sulfur dioxide to trioxide
SO₃(g) + H₂O(l) --------> H₂SO₄(aq)
given that; coal = 61.7 metric tons = 61700 kg
1.20 % by weight S, therefore mass of sulfur in coal will be;
⇒ 61700 × 1.20% = 740.4 kg
moles of sulfur = (740.4 × 1000 g) / 32 g/mole = 23,137.5 moles
moles of so₂ produced
= same moles of so₃ and same moles of H₂SO₄ = 23,137.5 moles
volume of pond = 397 m x 258 m x 5.64 m = 577,682.64 m³ = 577682640 L
Molarity = moles / volume = 23,137.5 / 577682640 = 4.0052 × 10⁻⁵ M
now each mole of H₂SO₄ will give 2 moles of H⁺
[H⁺] = 2 × 4.0052 × 10⁻⁵ = 8.0104 × 10⁻⁵ M
pH = -log[H⁺]
pH = -log [ 8.0104 × 10⁻⁵ M ]
pH = 4.0963
Therefore, the pH of the pond is 4.0963
In which way does asexual reproduction differ from sexual reproduction?
Answer:
MOUTHWASH lol lol lol lol. im just kidding heres the answer Asexual reproduction involves one parent and produces offspring that are genetically identical to each other and to the parent. Sexual reproduction involves two parents and produces offspring that are genetically unique.
Answer:
Sexual Reproduction has to include 2 parents and it can cause different genetic variety. While asexual reproduction is the parent (1) making copies of itself which has no genetic variety (mainly single celled organisms like protists and such)
Explanation:
My explanation is your answer
The element with the symbol Na
Select one
Cell
Metalloid
Non metal
Metal
Answer:
metal
Explanation:
it's a soft silvery metal
An atom or ion has 41 neutrons, 36 protons, and 36 electrons. Identify the clement symbol, and determine the mass
number and charge for this atom or ion.
The atom is krypton and its symbol is Kr.
the mass number is 41 + 36 = 77
its charge is 0 as it is a noble gas.
Scoring: Your score will be based on the number of correct matches minus the number of incorrect matches. There is no penalty for missing matches.
Use the References to access important values if needed for this question.
Match the gas sample on the left with a description on the right.
You may use the same answer more than once.
Clear All
0.115 moles of Xe in a 4.87 L container at a temperature of 446K
0.599 moles of Xe in a 5.78 L container at a temperature of 306K
0.444 moles of Xe in a 2.39 L container at a temperature of 408K
0.556 moles of Xe in a 2.11 L container at a temperature of 446K
has the highest average molecular speed
has the lowest average molecular speed
has an average molecular speed between the highest and the lowest
Answer:
Container 2 has the lowest average molecular speed
Container 4 has the highest average molecular speed
Explanation:
Step 1: Data given
Atomic mass of Xe = 131.29 g/mol
Container 1: Number of moles Xe = 0.115 moles; volume = 4.87 L; temperature= 446K
Container 2: Number of moles Xe = 0.599 moles; Volume = 5.78 L; temperature= 306K
Container 3: Number of moles Xe = 0.444 moles; Volume = 2.39L; Temperature = 408K
Container 4: Number of moles Xe = 0.556 moles; Volume=2.11L; Temperature =446K
Step 2: Calculate average molecular speed
Average molecular speed V = √(8RT/πM)
→With R = he gas constant expressed in units of J/mol-K
→with T = the temperature in Kelvin
→with M = the molar mass of the gas
Average molecular speed depends on T and M
Since it's all Xenon, M is the samefor the 4 containers
Container 1:
V1 = √(8*8.314*446K/π*131.29)
V1 = 8.48
has an average molecular speed between the highest and the lowest
V2= √(8*8.314*306K/π*131.29)
V2= 7.03
has the lowest average molecular speed
V3 = √(8*8.314*408K/π*131.29)
V3 = 8.11
has an average molecular speed between the highest and the lowest
V4 = √(8*8.314*446K/π*131.29)
V4 = 8.48
Since the volume is smaller than in container 1 the average molecular speed will be a higher
has the highest average molecular speed
Methane is combusted with Oxygen to produce Carbon Dioxide and Water. How many grams of oxygen are required to react with 55 grams of
Methane?
A.55 g
B.110 g
C.165 g
D.220 g
What is the vapor pressure of CH3COOH and 90*C?
Answer:
40.kPa hope this helps....
6. The drawing shows Samir riding his mountain bike.
i) Draw a circle around the places on the drawing where there
should be a lot of friction.
ii) Explain why there should be a lot of friction in these places.
Answer:
You Need To Upload The Photo Then I Will Help You :)
Explanation:
electronic configuration [Ne]3s2 3p6
What is the delta H fusion used to calculate volume of a liquid frozen that produces 1 kg of energy?
Answer:
The correct option is C. 1 kJ x 1/ΔHfus x g/mol x ml/g liquid
Explanation:
The change in enthalpy of fusion (ΔHfus) has units of energy divided into moles of substance:
ΔHfus = energy/mol of substance = J/mol or KJ/mol
Thus, we multiply the kJ of energy produced by the inverse of ΔHfus (in kJ/mol) we obtain the moles of substance:
energy (kJ) x 1/ΔHfus (mol/kJ) = moles of substance(mol)
Then, if we multiply the moles of substance by the molecular weight of the substance (in g/mol) we obtain the grams:
moles of substance(mol) x molecular weight (g/mol) = grams of substance (g)
Finally, if we multiply the grams of substance (in g) by the density of the substance (in g/ml) we obtain the volume (in ml):
grams of substance (g) x 1/density (ml/g) = volume (ml)
We combine all these parts to obtain the equation for the volume required to produce 1 kJ of energy:
energy (kJ) x 1/ΔHfus (mol/kJ) x molecular weight (g/mol) x 1/density (ml/g)
Therefore, the correct option is:
C → 1 kJ x 1/ΔHfus x g/mol x ml/g liquid
1 kJ x 1/ΔHfus x g/mol x ml/g liquid
Take your time please.
Answer:
1. Observing
2. Classifying
3. Predicting
4. Making a hypothesis
5. Experimenting
6. Measuring
7. Communicating
8. Making an inference
9. Constant
10. Interpreting data
Explanation:
Hope this helps!!
hope it is helpful to you
can someone help with this please. i will give brainliest
Answer:
Electromagnetic wave is defined as the wave which is associated with both electrical and magnetic component associated with them. They can travel in vacuum as well and travel with the speed of light.
The electromagnetic radiations consist of radio waves, microwaves, infrared ,Visible , ultraviolet, X rays and gamma rays arranged in order of increasing frequency and decreasing wavelengths.
The visible reagion contains Violet , Indigo , Blue , Green , Yellow , Orange and Red in order of increasimg wavelength and decreasing frequency.
What pair of properties do all solids have?
Answer:
Has definite shape and volume
Solids have high melting point
Explanation:
Plz help Need Answer Quick
Answer:
The correct answer is - [tex]\frac{P}{4}[/tex].
Explanation:
By the ideal gas equation is PV=nRT, the relation between pressure and volume can be drive if the temperature remains constant:
At constant temperature, for a fixed amount of gas, P∝
so the pressure is inversely proportional to volume. Therefore, if the volume is increased in this condition the pressure will decrease in the same manner and A decrease in the volume will lead to an increase in pressure.
Volume increased here = four times = 4V
pressure is P will decrease four times = P/4
Is this statement true or false?
Gymnosperms reproduce using seeds, but angiosperms do not.
Answer:
FALSE!
Explanation:
Gymnosperms do use seeds but are exposed like the pine cones of pines. Angiosperms still have seeds, however, they flower or fruit.
Answer:
False
Explanation:
A solution containing 1.50 mM ethanol and 2.40 mM methanol gave peak areas of 1487 and 3544, respectively. Subsequently, 2.00 mL of 3.2 mM methanol was added to a 7.00 mL unknown ethanol and diluted to 10.00 mL. The final solution gave peak areas of 6235 and 4487 for ethanol and methanol, respectively. Calculate the concentration of ethanol in the original unknown.
Answer:
8.99mM is the concentration of ethanol in the original unknown.
Explanation:
In chromatography, the peak areas of compounds are proportional to its concentration. The ratio of Area/Concentration for ethanol and methanol is:
Ethanol = 1487 / 1.50mM = 991,33 mM⁻¹
Methanol = 3544 / 2.40mM = 1476.67mM⁻¹
The concentration of ethanol in the diluted solution is:
6235 / 991.33mM⁻¹ = 6.29mM
The original solution was diluted from 7mL to 10mL, the concentration of the original solution is:
6.29mM * (10mL / 7mL) =
8.99mMWhich action is not an example of work?
A. pushing a box across the floor
B. picking up a box off the floor
C. holding a tray in the Cafeteria line
D. raising a barbell over your head
C. picking a tray in the cafeteria line
A 25.0 mL sample of an acetic acid solution is titrated with a 0.175 M NaOH solution. The equivalence point is reached when 37.5 mL of the base is added. The concentration of acetic acid in the sample was ________ M. A 25.0 mL sample of an acetic acid solution is titrated with a 0.175 M NaOH solution. The equivalence point is reached when 37.5 mL of the base is added. The concentration of acetic acid in the sample was ________ M. 0.175 0.119 0.365 0.263 none of the above
Answer:
= 0.2625M ≅ 0.26M (2 sig figs)
Explanation:
HOAc + NaOH => NaOAc + H₂O
25ml (Molarity of HOAc) =\ 37.5ml(0.175M NaOH)
Molarity of HOAc = 37.5ml(0.175M NaOH)/25ml
= 0.2625M ≅ 0.26M (2 sig figs)
