a. 2 M
b. 1.5 M
Further explanationGiven
a 4 moles in 2 dm of solution?
b 0.3 moles in 200 cm3 of solution
Required
The concentration of a solution
Solution
Molarity shows the number of moles of solute in every 1 liter of solution or mmol in each ml of solution
Can be formulated :
[tex]\large \boxed {\bold {M ~ = ~ \dfrac {n} {V}}}[/tex]
a.
moles(n) = 4
volume(V)=2 L solution
M = 4 : 2 = 2
b.
moles(n)=0.3
volume(V)=200 cm3 = 0.2 L
M = 0.3 : 0.2 = 1.5
Determine the type of light for
6.5x10^(-2)m
A.gamma rays
B.X rays
C.UV
D.IR
E.Microwave
F.Radiowaves
Answer:
hmm I would say microwave
A teacher moves a box of books weighting 25lbs a distance of 40ft. How much work has she done?
Answer:
[tex]workdone = weight \: \times \: distance \\ = 25 \times 40 \\ = 1000 \: lbsft \\ or \\ = 1000 \: joules[/tex]
Based on the information above, what is average speed of the toy car?
Fom/s
G 0.2 m/s
H 5 m/s
J 10 m/s
The average speed of the toy car : 0.2 m/s
Further explanationGiven
The motion of a toy car
Required
The average speed
Solution
Average speed = total distance/total amount of time ,
From the graph :
Total distance travelled : 4
Total time : 20 s
The average speed = total distance (d) : total time (s)
The avg speed = 4 : 20
The avg speed = 0.2 m/s
How many grams of oxygen are there in 15.5 grams of glucose, C6H12O6?
Which of these is the basic unit of mass?
OL
cm
O mi
kg
NCYT OLISTION
Answer:
Kg
Explanation:
Answer:
Kilograms(SI unit for mass) 10^3
Explanation:
What are these answers Please Help
Answer:
Electronic flow
Explanation:
Electronic Flow from one to another
please help me pls!!!
The half-life of plutonium-238 is 87.7 years.
What percentage of the atoms in a sample of plutonium-238 will remain radioactive after 263.1 years?
%
What percentage of the atoms in the same sample of plutonium-238 will have changed to another isotope after 263.1 years?
%
Answer:
263.1 is exactly three half-life, so the remaining portion is (1/2 x 1/2 x 1/2) of the original sample. That's 1/8 which is 12.5%
Answer:
12.5 87.5
Explanation:
When examining features on the ocean floor, like a volcano, how would it appear?
severely eroded
only somewhat eroded
not eroded at all
barely eroded compared to land volcanoes
Answer:
barely eroded compared to land volcanoes
Explanation:
the other person is wrong
An ice hockey puck travels 18m in 3s before it slides into the goal.What is the speed of the traveling puck?
Answer: 6m/s
Explanation:
Speed is calculated as distance divided by time. Therefore, the speed of the traveling puck would be calculated as the distance travelled by the hockey puck divided by the time taken. This will be:
= 18m / 3s
= 6m/s
The answer is 6 meters per second
Which property of silver chloride identifies it as a chemical compound?
O A. It is a heterogeneous substance.
O B. Its elements combine in a fixed ratio.
O c. It can be separated into its components by physical methods.
OD. Its physical properties are between that of silver and chlorine.
Answer:
D
Explanation:
because it has two or more properties
In a compound, what is this number called: H2O. Pretend it’s at the bottom of the element symbol but just the name of the number.
Thanks!
Answer:
It's the valence number of oxygen
Answer:
Mixture , element and Mass
Zn + 2HCI -> ZnCl2 + H2
a. How many moles of ZnCl, can be made from 1.7g of Zn?
b. If 6.4 grams of HCl are used in this reaction, how many moles of ZnCl, are
produced?
Answer:
0.02740 moles ZnCl2
0.8777 moles ZnCl2
Explanation:
a) How many moles of ZnCl, can be made from 1.7g of Zn?
First we need to convert from grams of Zn to moles of Zn, and then from moles of Zn to moles of ZnCl.
We will use the atomic weight of Zn to do this..
Atomic weight is 65.38 g Zn/1 mol Zn, this can also be written as
1 mol Zn/65.38mol Zn... We will now convert:
1.76 g Zn * [tex]\frac{1 mol Zn}{65.38 g Zn}[/tex] = 0.0273784032 moles Zn
Now we'll use the balanced chemical equation to convert from moles of Zn to moles of ZnCl..
Zn + 2HCl -> ZnCl2 + H2
We can see that for every mol of Zn that reacts, 1 mol of ZnCl2 is produced..
So:
0.0273784032 moles Zn * [tex]\frac{1 mol ZnCl2}{1 mol Zn}[/tex] = 0.0273784032 moles ZnCl2
This can be estimated to 0.0274 moles ZnCl2
__________________________________________________________
b) If 6.4 grams of HCl are used in this reaction, how many moles of ZnCl, are
produced?
First we need to convert form grams of HCl to moles of HCl, and then to moles of ZnCl...
We'll do this using the atomic weight of HCl (36.458 g/mol or 1 mol/36.458 g)
6.4 g HCl * [tex]\frac{1 mol HCl}{36.458 g HCl}[/tex] = 0.1755444621 mol HCl
Now we'll use the balanced chemical equation to convert from moles of HCl to moles of ZnCl..
Zn + 2HCl -> ZnCl2 + H2
We can see that for every 2 moles of HCl that react, 1 mol of ZnCl2 is produced..
So:
0.1755444621 mol HCl * [tex]\frac{1 mol ZnCl2}{2 mol HCl}[/tex] = 0.877722311 moles ZnCl2 are produced.
This can be estimated to 0.8777 moles ZnCl2
What is the mass of 6.25 moles of Ca(OH)2?
How is ionic radius
measured?
Answer:
The radius of an atom can only be found by measuring the distance between the nuclei of two touching atoms, and then halving that distance. The type of atomic radius being measured here is called the metallic radius or the covalent radius depending on the bonding.
Explanation:
(Pls mark me brainliest if you can)
Describe one physical property and one chemical property of sodium that you observed.
Answer:
It's a soft metal, reactive and with a low melting point, with a relative density of 0,97 at 20ºC (68ºF). From the commercial point of view, sodium is the most important of all the alkaline metals. Sodium reacts quickly with water, and also with snow and ice, to produce sodium hydroxide and hydrogen.
Explanation:
Hope this Helps
Water is sometimes called the universal solvent because it is a polar molecule that dissolves many substances. which of the following is soluble in water?
A. Ice
B. Metals
C. Oils
D. Salts
Answer: Salts
Explanation: Salts easily dissolve in water. Salts are always ionic bonds, meaning they dissolve easily.
Ice does not technically dissolve in water since ice is made of water. You can't dissolve a substance in itself.
Metals are obviously not able to dissolve either in water.
Oils do not mix with water, they float on water, meaning they are immiscible.
What is the molar mass of the EF?
Answer:
47.778
Explanation:
Answer:
97.11 should be correct
explanation
EF = C4H5ON2
molar mass= 4 (12.01) + 5 (1.9) +16 + 2 (14.01) = 97.11 glmol
Infectious agents vary in their size and shape. Which infectious agent tends to be the smallest?
Answer:
prions
Explanation:
They are the smallest infectious agent.
how many kilograms of solvent would contain 0.43 mol of CaO in a 2.5 molality solution
0.024 kg CaO
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Aqueous Solutions
Molarity = moles of solute / liters of solutionAtomic Structure
Reading a Periodic TablesUsing Dimensional AnalysisExplanation:Step 1: Define
0.41 mol CaO
2.5 M Solution
Step 2: Identify Conversions
1000 g = 1 kg
Molar Mass of Ca - 40.08 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of CaO - 40.08 + 16.00 = 56.08 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 0.43 \ mol \ CaO(\frac{56.08 \ g \ Cao}{1 \ mol \ CaO})(\frac{1 \ kg \ CaO}{1000 \ g \ CaO})[/tex]Multiply: [tex]\displaystyle 0.024114 \ kg \ CaO[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs as our lowest.
0.024114 kg CaO ≈ 0.024 kg CaO
Answer:
0.172 Kg
Explanation:
Given data:
Kg of solvent = ?
Moles of solute = 0.43 mol
Molality = 2.5 m
Solution:
Formula:
m = moles / Kg of solvent
by putting values,
2.5 m = 0.43 mol / kg of solvent
Kg of solvent = 0.43 mol / 2.5 m
Kg of solvent = 0.172 Kg
(HELP ME ASAP!)
Testing for Carbon Dioxide
Limewater is calcium hydroxide
solution, Ca(OH)2. It forms calcium
carbonate,CaCO3, and water when
it reacts with carbon dioxide.
limewater
a Write a word equation for this
b Why does limewater go milky
when carbon dioxide is bubbled
through it?
How can you convince someone that the earth moves slowly?
Answer:
By a resource or an EXTREMELY good explanation with good reasons and details.
Explanation:
PLEASE HELP ASAP! WILL GIVE BRAINLIEST! PLEASE HELP!!
Lightning is seen before its associated thunder is heard. This is because light waves travel faster in air than sound waves do. Through which material would sound waves move faster than light waves?
A. Liquid Water
B. Solid Bronze Metal
C. Oxygen Gas
D. Helium Gas
Answer:
solid Bronze metal
Explanation:
Ap3x verified
Answer:
b
Explanation:
a p e x
How many neutrons are in atom of an element that has 16 protons, 16 electrons, and a mass of 40?
Answer:
8
Explanation:
i dunno i think its right tho
2.
If 2 moles of solid carbon dioxide
evaporates, how many liters of CO2
will be formed at a temperature
of 300 K and 2.00 atmospheres of
pressure?
F 98.5 liters
G 2170 liters
H 24.6 liters
J 1080 liters
Answer:2170
Explanation:
Calculate the pH of a solution with [+]= 1x 10^-6
12
28.01
6
14
PLEASE HELP DUE TODAY
WILL GIVE ALL POINTS IF COMPLETED
lmk in the comments section if ur gonna do it dont use the answer
.........................
Q6
a) HCl dipole-dipole --> higher
I2 london dispersion
b) CH3F H-bonding --> higher ( higher Molecular mass)
CH3OH H-bonding
c) H2O H-bonding --> higher
H2S dipole-dipole
d) SiO2 dipole-dipole --> higher (the difference is higher in the electronegativity )
SO2 dipole-dipole
e) CH3OH H-bonding
CuO ionic-dipole --> higher because it is ionic compound
f) NH3 H-bonding (higher)
CH4 london dispersion
g) HCl dipole-dipole
NaCl ionic dipole--> HIGHER ionic compound
h) SiC london dispersion
Copper metallic bond --> higher
Why is the cell theory so important??
Answer:
yes
Explanation:
The cell theory states that all biological organisms are composed of cells; cells are the unit of life and all life come from preexisting life. The cell theory is so established today that it forms one of the unifying principles of biology.
how would you describe life and why?
Answer:
Life to me is like a long road that has no stopping point.
I tried, Hope this helps :)
Headaches forced onto me. I was forced out of the womb by two women. My mother and my mother's doctor. I was held in adults arms and I hated it. I had to do whatever they said. I had these diapers around my bo.oty and they were so uncomfortable. I got older and I don't know why I listened to country. The only country song I like now is God Made Girls by Rae Lynn. I got older and started asking what inappropriate words meant. My parents told me the exact meanings and didn't censor. I was disgusted and stayed silent for hours. Now I'm my current age and I need to do about 5 math assignments each day all due at 11:59 pm or else they're missing and I have no excuses. I don't get them at all either there's not explanations. In conclusion, life is headaches forced onto me.
Platinum Abundance missing 198 and 195
Platinum Isotope (amu) Percent Abundance
194
195
34%
196
25%
198
What is the percent abundance of Pt-194, if the average atomic mass of platinum is 195.16 and platinum has only four naturally
occurring isotopes?
es)
A)
8%
B)
25%
33%
D)
50%