Answor
c
Explanation:
If a 0.7 M solution of Ca(OH)2 dissociates completely in water, what is the
final [OH-]?
Answer:
1.40 M [OH⁻]
Explanation:
This compound dissociates into 3 ions, but since we are asked about [OH⁻], it's only 2. Therefore, multiply the molarity of the solution by the number of ions that [OH⁻] dissociates into:
2 × 0.70 M = 1.40 M
Hope this helps! Sorry that you got a link. Those are getting really annoying
When the medium is uniform, how do light waves travel through it? vibrating motion circular motion irregular motion straight line motion
Answer:
straight line
Explanation:
Answer:
All K12 ppl say yeye
Explanation:
Determine the number of representative particles in each of the following:
(a) 0.294 mol silver
____ atoms
(b) 8.98 10-3 mol sodium chloride
____ formula units
(c) 23.3 mol carbon dioxide
____ molecules
(d) 0.310 mol nitrogen (N2)
____ molecules
Answer:
(a) 0.294 mol silver = [tex]1.770 * 10^{23}[/tex]
(b) 8.98 * 10-3 mol sodium chloride - [tex]5.407 *10^{23}[/tex]
(c) 23.3 mol carbon dioxide = [tex]1.403 * 10^{25}[/tex]
(d) 0.310 mol nitrogen (N2) = [tex]1.866 * 10^{23}[/tex]
Explanation:
In one mole there are [tex]6.022 * 10^{23}[/tex] atoms/molecules
(a) 0.294 mol silver = [tex]6.022 * 10^{23} * 0.294 = 1.770 * 10^{23}[/tex]
(b) 8.98 * 10-3 mol sodium chloride - [tex]5.407 *10^{23}[/tex]
(c) 23.3 mol carbon dioxide = [tex]23.3 * 6.022 * 10^{23} = 1.403 * 10^{25}[/tex]
(d) 0.310 mol nitrogen (N2) = [tex]0.310 * 6.022 * 10^{23} = 1.866 * 10^{23}[/tex]
How many grams are there in 5.0 x 10^25 molecules of H2? Round to the tenths places.
Answer:
166.04g
Explanation:
Mass=Moles xRMM
1 mole = 6.023 x10^23molecules
5.0 x10^25molecules
=83.02moles
RMM=2
mass=83.02 x2
and=166.04g
what is 1 mol / 66.04g
Answer:
15.142338 mol/kg
Explanation:
(1 mole) / (66.04 grams)
What happens when water is added to quicklime? Write two observations.
Answer:
1.Most metal oxides are insoluble in water but some of these (e.g. Na2O.
Explanation:
2.: (i) A hissing sound is observed.
1.ii) The mixture starts boiling and lime water is obtained.
Cuales son los símbolos para representar que una reacción se produce en presencia de;
a) electricidad
b) electrolitos
Answer:
b
Explanation:
What is the range of pH values in a basic solution?
a.pH=7
b.pH is greater than 7
c.pH is between 0 and 14
d.pH is less than 7
Answer:
b. ph is greatet than 7
Explanation:
ph=7 neutral
ph=7-14 basicity as you go up increase basicity
ph=0-7 acodity as you go down increasing acidity
CH3OH=CO+H2 Balance the equations and tell the atoms. Giving brainliest
Answer:
CII + 4 e- → C-II (reduction)
4 H0 - 4 e- → 4 HI (oxidation)
Explanation:
Answer:
The correct answer should be:
[blank] CO + [2] H2 => [blank] CH3OH
or
CO + [2] H2 => CH3OH
Necesito su nomenclatura UIQPA
Answer:
3,3 Methyl hexyne
I hope it's helps you
water will boil when...
Answer:
C
Explanation:
name two enzyme used to make alcohol
Answer:
here is your answer
Cellulase and proteases are two enzymes are used for making alcohol
hope it helps you
Explanation:
pwlss giv meh brainless
how many formula units are present in 0.354 moles of copper (III) chloride, CuCl2
Answer:
47.596008
Explanation:
What is the molarity of a solution where one mole of NaOH is added to 2000mL of water
Answer:
Molarity of a solution where one mole of NaOH is added to 2000mL of water is 0.0005
Explanation:
Molarity is the equal to number of moles of solute divided by total volume of solvent
Given -
Number of moles of solute i.e NaOH = 1
Total volume of solvent i.e water = 2000 mL
Molarity [tex]\frac{1}{2000} = 0.0005[/tex]
what are protons, what is their charge, and where they located?
Answer:
Protons are the positive parts in an atom, they are positively charged and they are located in the nucleus of an atom..
Explanation:
prolly not the best explanation but hope it helps <3
The first medical encyclopedia was written by an Arab scholar. Please select the best answer from the choices provided T F
Answer:
True
Explanation:
Asclepius known as the God of medicine, it is said to be healing in ancient Greek religion thag stands for thd healing aspect of the medical arts.
Medical encyclopedia is referred to as a general reference information that is used as sorting out medical related issues. It is a compilation of well written book or document that consists lf information that are related to diseases, medical cases, different tests, symptoms of the ailments, injuries, surgeries etc. and the documents have an a well broad photos of medicine-related photographs and others.
Answer:
T
Explanation:
A 15.0 ml sample of gas at 10.0 degree Celsius and 760 torr changes to a pressure of 1252 torr at 35.0 degree Celsius. What is the volume of the gas?
Answer:
9.91 mL
Explanation:
Using the combined gas law equation as follows;
P1V1/T1 = P2V2/T2
Where;
P1 = initial pressure (torr)
P2 = final pressure (torr)
V1 = initial volume (mL)
V2 = final volume (mL)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the information provided in this question;
V1 = 15.0mL
V2 = ?
P1 = 760 torr
P2 = 1252 torr
T1 = 10°C = 10 + 273 = 283K
T2 = 35°C = 35 + 273 = 308K
Using P1V1/T1 = P2V2/T2
760 × 15/283 = 1252 × V2/308
11400/283 = 1252V2/308
Cross multiply
11400 × 308 = 283 × 1252V2
3511200 = 354316V2
V2 = 3511200 ÷ 354316
V2 = 9.91 mL
When writing the chemical formulas for a molecular compound, what method do you use?
Answer:
A molecular compound is usually composed of two or more nonmetal elements. Molecular compounds are named with the first element first and then the second element by using the stem of the element name plus the suffix -ide.
I need help with Hess law
Answer:
The energy changes in converting reactants to products is the same regardless of the route by which the chemical changes occur.
Calculate the percentage composition of SrBr2
Answer:
64.6% of Br and 35.4% of Sr
Explanation:
The percentage composition is obtained defining the percentage in mass of each atom in a molecule.
To solve this question we must find the mass of each atom in 1 mole:
Molar mass Br: 79.904g/mol
Molar mass Sr: 87.62g/mol
The molar mass of SrBr2 is:
79.904g/mol*2 + 87.62g/mol =
159.808g/mol + 87.62g/mol =
247.428g/mol
The percentage of Br is:
79.904g/mol*2 = 159.808g/mol / 247.428g/mol * 100
= 64.6% of Br
And percentage of Sr is:
87.62g/mol / 247.428g/mol * 100
= 35.4% of Sr
2 C2H6 + 7 O2 → 4 CO2 + 6 H2O How many moles of oxygen gas (O2) are needed to create EXACTLY 6 moles of Carbon dioxide(CO2)?.
Hi can anyone help me ?
Answer:
its 4
Explanation:
Which statement below best describes how the interaction of two systems causes a human arm to bend?
A. The circulatory system sends signals to the nervous system
B. The nervous system sends signals to the muscoskeletal system
C. The circulatory system sends singlas to the musclskeletal system
D. The digestive system sends signals to the nervous system
Answer:
your answer is C I believe
Which time shows the lowest composition of all green house gases?
Answer:
1750
Explanation:
Greenhouse gases are those gases that are believed to contribute to the rise in the temperature of the earth by trapping infrared rays close to the surface of the earth.
Prominent among the greenhouse gases are; N2O, methane and CO2.
From the chart, we can see that the lowest sum of concentration of greenhouse gases measured in ppm was obtained in 1750. Thus this period shows the lowest composition of greenhouse gases.
What is the common uses for Manganese????
Which fraction contains the largest molecules?
A) diesel
B)gasoline
C)kerosene?
25 ml of 2.4 M K2(CO3) is mixed with 35 ml of 2.0 M Al(NO3)3. (a) Evaluate the moles for each reactant (b) indicate the limiting reactant (c) how many moles of Al2(CO3)3 are formed?
Answer:
a) 0.06 mol K₂(CO₃) and 0.07 mol Al(NO₃)₃
b) The limiting reactant is K₂CO₃
c) 0.03 moles of Al₂(CO₃)₃
Explanation:
The balanced reaction between K₂CO₃ and Al(NO₃)₃ is the following:
3 K₂CO₃ + 2 Al(NO₃)₃ → Al₂(CO₃)₃ + 6 KNO₃
(a) We can calculate the moles for each reactant as the product of the molarity (M) and the volume (V) in liters.
K₂(CO₃): M = 2.4 mol/L , V = 25 mL x 1 L/1000 mL = 0.025 L
⇒ moles K₂(CO₃) = M x V = 2.4 mol/L x 0.025 L = 0.06 mol K₂(CO₃)
Al(NO₃)₃: M = 2.0 mol/L , V = 35 mL x 1 L/1000 mL = 0.035 L
⇒ moles Al(NO₃)₃ = M x V = 2.0 mol/L x 0.035 L = 0.07 mol Al(NO₃)₃
(b) According to the balanced equation, the stoichiometric ratio is 3 moles K₂CO₃/2 moles Al(NO₃)₃. We have 0.07 moles of Al(NO₃)₃, so we multiply the moles of Al(NO₃)₃ by the stiochiometric ratio to calculate how many moles of K₂CO₃ are needed:
0.07 mol Al(NO₃)₃ x 3 mol K₂CO₃/2 mol Al(NO₃)₃ = 0.105 moles of K₂CO₃
We need 0.105 moles of K₂CO₃ but we have only 0.06 moles of K₂CO₃. Therefore, the limiting reactant is K₂CO₃.
(c) We use the limiting reactant to calculate how many moles of product (Al₂(CO₃)₃) are formed. According to the equation, 2 moles of K₂CO₃ produce 1 mol of Al₂(CO₃)₃, thus the stoichiometric ratio is 1 mol Al₂(CO₃)₃/2 moles K₂CO₃. We have 0.06 moles of K₂CO₃, so the number of moles of Al₂(CO₃)₃ will be:
0.06 moles K₂CO₃ x 1 mol Al₂(CO₃)₃/2 moles K₂CO₃ = 0.03 moles of Al₂(CO₃)₃
Escaping from the haunted house, Anna ran home immediately to her chemistry lab
back at the high school. After analysis of the gold heart, she found the heart was not
composed of pure gold, but gold (III) oxide (Au203). What percentage (by mass) was
gold in the heart?
a) 10.9% Au
C) 89.1% Au
b) 81.2% Au
d) 92.9% Au
Will Give Brainliest!!
Answer:
A
Explanation:
because it's positive
Show work on how you answer it, please.
Answer:
the frist one is balance
by the side of reactant is
C=8
O=8
H2=17×2=34
from the product side
C=8
O=8×1=8
H2=18+(8×2)=34
and they are balance
the second one is
the reactant side
Fe=4
S=4
O2=7×2=14
the product side of the chemical equation
Fe=3×2=6
S=4
O=(4×2)+(3×3)=6+9=15
it is not balance.
#THE FRIST ONE IS BALANCE.
#THE SECOND ONE IS NOT BALANCE.