Answer:
The law of conservation of matter states that in a chemical reaction matter cannot be created or destroyed
Explanation:
which sounds better? oreo pancakes or a tamale with hot sauce
Calculate the mass in grams of a 1.070 mole of acetylene ,C2H2
Answer:
27.86x10^-3 Kg
Explanation:
Hi! To get the result you only need to use this formula: m = n x M <=> m = 1.070 x ((2x12.01 + 2x1.01) x 10^-3) = 27.8628 x 10^-3 Kg. Hope it helped!
How many molecules are in 3 moles of CO2?
O A. 5.418 x 1024
OB. 1.806 x 1024
O C. 6.02 x 1024
O D. 1.806 x 1023
Answer:
1.806 × 10²⁴Explanation:
The number of molecules can be found by using the formula
N = n × L
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
N = 3 × 6.02 × 10²³
We have the final answer as
1.806 × 10²⁴Hope this helps you
Answer: OB. 1.806 x 1024
Explanation:
Which is the best example of a new substance forming?
cutting a piece of paper
lighting a match
popping a balloon
hitting a nail with a hammer
Somebody please helppppppppppp
Answer:
B. Trees can be replenished
Explanation:
Trees are renewable and replenishable resources. Trees can be planted, grown up, and harvested for timber.
If a gas is cooled from 315 K to 231 K, what was its initial pressure if its final pressure is 625 torr?
Answer:
The initial pressure was 852.27 torr.
Explanation:
Given that,
Initial temperature, T = 315 K
Final temperature, T' = 231 K
Final pressure, P' = 625 torr
We need to find the initial pressure of the gas. We know that, the relation between pressure and temperature is given by :
[tex]\dfrac{P}{P'}=\dfrac{T}{T'}\\\\P=\dfrac{P'T}{T'}\\\\P=\dfrac{625\times 315}{231}\\\\P=852.27\ torr[/tex]
So, the initial pressure was 852.27 torr.
12 moles of Cu is how many grams of Cu?
Cu = 63.55 grams/mole
Answer needs to be rounded to 2 decimal places: 0.00
Answer:
762.60 g
Explanation:
In order to convert from moles of a substance into grams, we need to multiply the number of moles by the substance's molar mass:
Moles * Molar Mass = GramsWith the above information in mind, we can use the data given by the problem and calculate how many grams are there in 12 moles of Cu:
12 mol * 63.55 g/mol = 762.60 gASAP. Which process represents a physical change?
1.Roasting a marshmallow over a camp fire
2.Melting chocolate in a pan on the stove
3.Bruising of a banana's skin after dropping on the floor
4.Bubbling due to an antacid tablet in vinegar
Why should you prefer dry-ashing to wet-ashing of a food sample such as
cabbage?
The purpose of a generator is to convert:
A. electrical energy to mechanical energy.
B. mechanical energy to electrical energy.
C. chemical energy to nuclear energy.
D. mechanical energy to chemical energy.
Answer:
b (mechanical energy to electrical energy)
Answer:
because mechanical energy is the generator. And it's majority is to convert mechanical energy to electrical energy
Create a graphic organizer describing types of substances including the difference between pure substance and mixture with subtypes and examples.
SCAM ANSWERS WILL BE DELETED.
If you answer this seriously I will P.A.y.P.a.l you 2 dollars. just leave them in the comments of your answer
Answer:
Pure substances are further divided into elements and compounds. The combination of two or more pure substances is called a mixture. Mixtures can be classified into two types viz. heterogeneous and homogeneous mixtures.
Explanation:
A popular classroom demonstration consists of filing notches into a new penny and soaking the penny in hydrochloric acid overnight. Because new pennies are made of zinc coated with copper, and hydrochloric acid dissolves zinc and not copper, the inside of the penny is dissolved by the acid, while the outer copper shell remains. Suppose a penny contains 2.5 g of zinc and is soaked in 20.0 mL of 6.0 M HCl. Calculate the concentra- tion of the HCl solution after all of the zinc has dissolved. Hint: The Zn from the penny is oxidized to Zn2
Answer:
[tex]HCl conc=2.2M[/tex]
Explanation:
From the question we are told that:
Mass of zinc [tex]Mass_{z_n}=2.5g[/tex]
Initial conc of HCl [tex]HConc_1=6.0M[/tex]
Initial volume of HCl [tex]Hvol_1=20.0mL[/tex]
Molar mass of zinc [tex]M_{Z_n}=65.38g/mol[/tex]
Generally the equation for reaction is mathematically given by
[tex]2HCL+Zn\implies ZnCl_2 +H_2[/tex]
Generally the equation for moles of zinc [tex]m_{z_n}[/tex] is mathematically given by
[tex]m_{z_n}=\frac{Mass_{Z_n}}{M_{Z_n}}[/tex]
[tex]m_{z_n}=\frac{2.5g}{M_{65.38}}[/tex]
[tex]m_{z_n}=0.038molZn[/tex]
Generally the equation for moles of [tex]m_{HCl}[/tex] is mathematically given by
[tex]m_{HCl}=HConc_1*Hvol_1[/tex]
[tex]m_{HCl}=6.0M*20.0mL[/tex]
[tex]m_{HCl}=6.0M*20.0*10^{-3}L[/tex]
[tex]m_{HCl}=0.12\ mol\ HCl[/tex]
Generally the reacted moles of HCl [tex]HCl_[reacted][/tex] is mathematically given by
Since
Zn:HCl =1:2
Therefore
[tex]HCl_[reacted]=0.038*\frac{2}{1}[/tex]
[tex]HCl_[reacted]=0.076mol \ HCl[/tex]
Generally the moles of HCl after Zn oxidization X is mathematically given by
[tex]x=0.12-0.076[/tex]
[tex]x=0.044 mol HCl[/tex]
Generally the conc of hydrochloride acid X is mathematically given by
[tex]X=\frac{0.044}{0.020}[/tex]
[tex]X=2.2 M Hcl[/tex]
Therefore Conc of HCl
[tex]HCl conc=2.2M[/tex]
When the gas shown in the Energy Distribution diagram is heated to "T2," what has happened?
Select all that apply.
The average kinetic energy has lowered.
The average kinetic energy has increased.
o The highest energy level has decreased.
Less molecules have a higher energy level.
More molecules have a higher energy level.
Answer:
The average kinetic energy has increased. More molecules have a higher energy level.
Explanation:
I so esay
If electric current is passed through aqueous LiBr, the product at the cathode would be __________ and the product at the anode would be __________.
a) H2O(l), Li+(aq)
b) Br2(l), Li(s)
c) Li(s), Br2(l)
d) Br2(l), H2(g)
e) H2(g), Br2(l)
In DNA a purine base should only pair with a pyrimidine base. Give one reason why this
would be the case.
Answer:
Explanation:
Pairing of a specific purine to a pyrimidine is due to the structure and properties of these bases. A and G are purines and T and C are pyrimdines. In DNA base pairing, A pairs with T and C with G.
In the outline of the Periodic Table below, some elements are shown as numbers.
Which two numbers are metals in the same period?
Answer:
5 and 6
Explanation:
Answer:
3 and 4
Explaination:
The metals are Sodium and Phosphorus respectively which are in period 2 of the periodic table but in different groups.
What is the value of for this aqueous reaction at 298 K?
A+B↽⇀C+D ΔG°=12.86 kJ/mol
K=
Answer:
The equilbrium constant is 179.6
Explanation:
To solve this question we can use the equation:
ΔG = -RTlnK
Where ΔG is Gibbs free energy = 12.86kJ/mol
R is gas constant = 8.314x10⁻³kJ/molK
T is absolute temperature = 298K
And K is equilibrium constant.
Replacing:
12.86kJ/mol = -8.314x10⁻³kJ/molK*298K lnK
5.19 = lnK
e^5.19 = K
179.6 = K
The equilbrium constant is 179.6What's the partial pressure of hydrogen in a gas mixture if its mole fraction is 0.1 and the total pressure is 325 torr?
Question 15 options:
325 torr
32.5 torr
100 torr
65 torr
How do autotrophs and heterotrophs relate to the carbon cycle?
Answer:
Autotrophs store chemical energy in carbohydrate food molecules they build themselves. Most autotrophs make their food through photosynthesis using the energy of the sun. Heterotrophs cannot make their own food, so they must eat or absorb it.
How many moles of ethyl alcohol, C2H5OH, are present in 65 mL of a 1.5 M
?solution
Answer:
How many moles of ethyl alcohol, C2H5OH, are present in 65 mL of a 1.5 M
?solution
Explanation:
How many moles of ethyl alcohol, C2H5OH, are present in 65 mL of a 1.5 M
?solution
Answer:
i dont know. Chemistry is really hard.
Explanation:
sorry
Can someone pls answer this question
How many elements of oxygen are present in the molecule below 3Ca(OH)2
Answer:
Two elements of oxygen are presented.
How many liters of 3.0 MNAOH solution will react with 2.4 mole H2 S04
A balloon with an initial volume of 3.5 L at a temperature of 296 K is warmed to 376 K
What is its volume at 376 K?
Answer:
4.4 L
Explanation:
From the question given above, the following data were obtained:
Initial volume (V₁) = 3.5 L
Initial temperature (T₁) = 296 K
Final temperature (T₂) = 376 K
Final volume (V₂) =?
The final volume of the balloon can be obtained by using the Charles law equation as illustrated below:
V₁ / T₁ = V₂ / T₂
3.5 / 296 = V₂ / 376
Cross multiply
296 × V₂ = 3.5 × 376
296 × V₂ = 1316
Divide both side by 296
V₂ = 1316 / 296
V₂ = 4.4 L
Thus, the final volume of the balloon is 4.4 L
If you had 6H2 molecules and 4O2 molecules, how many H2O molecules could you produce?
Answer:
6
Explanation:
As , 2H2 + O2 = 2H2O
with 6 H2, 4O2 is excess.
H2O molecules formed = 6
names the process which takes place when a red litmus paper turns white when dropped into chlorine water
Answer:
Answer. Explanation: Chlorine gas bleaches the damp litmus (red or blue). Bleaching is an oxidation process.
number of proton of gold
Answer:
English Language Learners Definition of number. (Entry 1 of 2) : a word or symbol (such as "five" or "16") that represents a specific amount or quantity. : a number or a set of numbers and other symbols that is used to identify a person or thing.
Explanation:
79 is the number of protons gold has.
Hope this helps; have a great day!
Please answer! Tap on the photo❤️
Answer:
E
Explanation:
no of grams in picture c = A+B
= 200+10 =210
for D its also 210 ..... the water already contains the salt .....so the mass of salt has added to the mass of water which is still 210
that's all .... have fun
Calculate the amount (in moles) of magnesium in 1.23 g.
Answer
0.32 is that answer
Explanation:
you just use the calculator
balance Al2O3 + NaOH + H2O = NaAl(OH)4
Answer:
Al₂O₃ + 2 NaOH + 3 H₂O = 2 NaAl(OH)₄