Answer:
a. 0.78%
Explanation:
Given data:
Total percentage of hydrosphere = 2.5%
Percentage of ground water = 31%
Percentage of hydrosphere we use for drinking = ?
Solution:
Percentage of hydrosphere we use for drinking = Percentage of ground water /100 × Total percentage of hydrosphere
By putting values,
Percentage of hydrosphere we use for drinking = 31 / 100× 2.5
Percentage of hydrosphere we use for drinking = 0.78%
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:
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
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:
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
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
(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 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)
What are these answers Please Help
Answer:
Electronic flow
Explanation:
Electronic Flow from one to another
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.
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
Bonus question which of these is the smallest??
Answer:
Explanation:
Atoms
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 are you able to see cells?
Explanation:
you are to see cells By doing an experiment.
please help me pls!!!
Car and Motorcycle engines are controlled by what chemical reaction?
Car and Motorcycle engines are controlled by a chemical reaction which is controlled by gasoline and oxygen.
What is a Chemical reaction?A chemical reaction may be defined as a process that significantly involves the chemical transformation of one set of chemical substances to another. This process involves the utilization of substances known as reactants that are transformed into other substances known as products.
The fuel in cars and motorcycles delivers the source of energy to them in order to move from one place to another. This fuel significantly contains gasoline which reacts with atmospheric oxygen and results in a small explosion which derives some sort of energy that is finally consumed by the vehicle's engine.
Apart from this, the combustion of fuel is also facilitated in the presence of oxygen which liberates extremely high amounts of carbon dioxide in the atmosphere. This reaction has also occurred in the engines of vehicles.
Therefore, car and Motorcycle engines are controlled by a chemical reaction which is controlled by gasoline and oxygen.
To learn more about Chemical reactions, refer to the link:
https://brainly.com/question/11231920
#SPJ2
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%
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.
Easy points. Chemistry question. Put the following molecules in order, from those that require the least energy to break
the carbon-carbon bond to those that require the most energy. Use the letters A, B, and C. Pls explain why
(11....
1. Use the chart below to determine which element has the larger Zeff
value. Circle an answer for a-e:
a) Li or K b) C or O c) C or P d) C or Se e) Li or Br
Answer:
c
Explanation:
because chlorine and phosphorus
What is the difference between the Lewis model and the valence-shell electron pair repulsion (VSEPR) model?
A.
Only the Lewis model shows the covalent bonds in a molecule.
B.
Only the VSEPR model can be used to explain intermolecular forces.
C.
Only the Lewis model takes into account unbonded electrons.
D.
Only the VSEPR model shows the geometric shape of a molecule.
Answer: only the VSEPR mode shows the geometric shape of a formula.
A student observes poor growth of plants in a garden containing high clay content. Clay content reduces drainage in soil. Which of these is the best method to improve plant growth in the garden?
A. water the plants once a month
B. add sand to the soil
C. mix soil with chemicals which absorb the air
D. do not dig or till the soil
Answer: Add sand to the soil
Explanation:
Just finished my test
Answer:
add more sand to the soil
Explanation:
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
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:
some help I’ll give brainliest
Answer: Meteoroid
Explanation:
Dwarf planets are smaller than moons
Comets are smaller than dwarf planets.
Meteoroids, Meteors, and Meteorites are broken off pieces of comets.
Meteoroids are smaller than Asteroids
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:
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.
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
What is the mass of 6.25 moles of Ca(OH)2?
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]
Where are earthquakes and volcanos most likely to occur?
within oceanic plates
continental boundaries
plate boundaries
hot spots
Answer:
continental plate boundaries
Explanation: