Answer:D.
Explanation:
Why is it impossible for scientists to use macroscopic tools such as scissors to create nanoparticles?.
Nano particles are very small and can not be seen with eyes measuring between 1 to 100 n m. Because of their small size, they can't be made from macroscopic tools.
What are particles?These refers to those particles whose size lie between 1 to 100 n m. They are extremely small and often can not be seen with the eyes.
Owing to the fact that these particles are very small , they can not be created with very large substances.
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URGENT!! 50 Points Please Help!! Will mark brainliest!! Assignment due in 30 minutes.
2.) Round off each of the answers correctly.
a.) 8.7g + 15.43g + 19g = 43.13g
b.) 4.32cm × 1.7cm = 7.3444[tex]cm^{2}[/tex]
c.) 853.2L - 627.443L = 225.757L
d.) 38.732[tex]m^{2}[/tex] ÷ 0.421m = 92.02375m
e.) 5.40m × 3.21m × 1.871m = 32.431914[tex]m^{3}[/tex]
f.) 5.47[tex]m^{3}[/tex] + 11[tex]m^{3}[/tex] + 87.300[tex]m^{3}[/tex] = 103.770[tex]m^{3}[/tex]
3.) Make the following conversions:
a.) 157cs to seconds
b.) 42.7L to milliliters
c.) 261nm to millimeters
d.) 0.065km to decimeters
e.) 642cg to kilograms
f.) 8.25 × [tex]10^{2}[/tex]cg to nanograms
a) The least number of decimal points is 0 so you should round the answer to 43.
b) The least number of significant figures is 2 so round to 7.3
c)The least number of decimal places is 1 so round to 225.7
d) The least number of significant figures is 3 so round to 92.0
e) The least number of significant figures is 3 so round to 32.4
f) The least number of decimal places is 0 so round to 104m^3
Basically, for addition and subtraction round to the least number of decimal places found in the factors, and for multiplication and division round to the least number of significant figures found in the factors.
pretty sure its easy but i cant-
Answer:
Tryptophan is an essential amino acid that can be found in the genetic code of humans
The bond angles around a carbon in a
double bond are______
and it
is______
hybridized.
A) 109. 5, sp^2
B) 120, sp ^3
C) 120, sp ^2
D) 109. 5, sp^3
Answer:
C. 120, sp²
Explanation:
Chose the options that would be the proper procedures for cleaning up an acid spill?.
Answer:
Acid Spills (hydrochloric or sulfuric acid):
Neutralize spill with sodium bicarbonate/baking soda 2. Wait until bubbling/fizzing has stopped 3. When using a neutralizing spill kit, the kits are buffered and will not have a bubbling action.
Control and Containment of Spill
The first step in cleaning up a chemical spill should involve the control and containment of the spill. Before commencing the clean-up of a chemical spill, all personnel must be wearing the appropriate PPE including safety goggles, gloves and long-sleeve lab coats.
Are the following chemical equations balanced?
NH, +2, + NO + H2O
Answer:
I think it is D
Explanation:
because i did this one
Is brass a heterogeneous or homogeneous mixture ??????
Answer me first and right and then I promise you I will mark you the brainliest.
Also 20 points
Answer:
Brass is a homogenous mixture of copper and zinc
Hope it helped u, plz put thanks
Answer:
Brass is an alloy made up of uniform composition of copper and zinc. It is a homogeneous mixture in which zinc and copper can be varied to create a range of brasses with varying properties.
Explanation:
Hope it helps jenita or jeni , ya jenny
I hope the picture is there this time, help asap
A small crystal is added to a solution and it sinks to the bottom of the beaker. What can this tell you about the original solution?
A.
It is saturated because the crystal will not sink to the bottom of the beaker.
B.
It is supersaturated because the crystal sank to the bottom of the beaker.
C.
It is saturated because when the crystal was added to the beaker, the entire solution turned into a solid.
D.
It is unsaturated because the crystal did not dissolve in the solution.
Gadolinium (Gd) is element 64 on the periodic table. A sample contains 4.56×1022 atoms of Gd. What amount (mol) of Gd is present in a sample containing 4.56×1022 atoms?
Answer:
.757 moles of Gd is present in a sample containing 4.56x10^22 atoms of Gd.
Explanation:
Atoms --> Moles
1. Take the given number and put it over 1
(4.56x10^22 atoms/1)
2. Multiply by 6.022x10^23 to go from atoms to moles
(4.56x10^22 atoms/1) (1mol Gd/6.022x10^22 atoms)= .757223513...
3. Round by sigfigs
4.56 has three sigfigs
=.757 mols
anybody know the answer
Answer:
i think c
Explanation:
Fill in the coefficients that will balance the following reaction:
__H2+__O2 —> __H₂O
Answer:
2H2+1O2—>2H2O
Explanation:
2H2+1O2—>2H2O
Answer:
2H2+1O2-> 2H2O
Explanation:
2h2= 4 hydrogens
1o2= 2 oxygens
///
2 h2O= 4 hydrogens and 2 oxygens
// they are balanced
Carbon reacts with oxygen to produce carbon dioxide. What mass of carbon dioxide is produced if 24 grams of carbon reacts completely with 64 grams of oxygen? *
Answer:
88g
Explanation:
Since the total mass of substances used up in the reaction must be equal to the amount of product formed, according to the conservation of mass law, there must be 64 g + 24 g = 88 g of carbon dioxide present after the reaction.
i need help badly
what is the individual element that make up HCI
Answer:
It is two elements, Hydrogen and Chlorine
Explanation:
Hydrochloric Acid is made with 1 hydrogen atom and 1 chlorine atom bonded with a single covalent bond
Answer: hydrochloric acid
Explanation: It is a compound of the elements hydrogen and chlorine, a gas at room temperature and pressure. And the solution of the gas in water is called hydrochloric acid. :) hope that helps
A rapid reaction between oxygen and fuel that results in fire.
3. A submarine fills a special storage area known as a ballast with water in order to
increase its density. This allows it to dive deeper in the ocean. When a submarine
needs to rise rapidly, compressed air is used to push the water out of the ballast.
What effect does replacing the water in the ballast with air have on the submarine?
A. The submarine's volume increases, lowering its density.
B. The submarine's mass decreases, lowering its density.
C. The submarine's mass increases, raising its density.
D. The submarine's volume decreases, decreasing its density.
Answer:
B; The submarine volume increases, lowering its density.
Explanation:
My teacher told me.
Which of the below options is not a type of chemical bond?
magnetic attraction
ionic bond
covalent bond
polar bond
Answer:
magnetic attraction
Explanation:
Magnetic attraction is not a type of chemical bond while ionic bond, covalent bond and polar bonds are types of chemical bonds.
What is an ionic bond?Ionic bond or electrovalent bond is a type of bond which is formed between two elements when there is an exchange of electrons which takes place between the atoms resulting in the formation of ions.
When the atom looses an electron it develops a positive charge and forms an ion called the cation while the other atom gains the electron and develops a negative charge and forms an ion called the anion.
As the two atoms are oppositely charged they attract each other which results in the formation of a bond called the ionic bond.Compounds with ionic bonds are hard and have high melting points.These bonds usually exist in crystals.
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If a kitchen washcloth harbors microbes that can be transmitted to an individual to cause disease, then the washcloth is considered
an endospore.
a virus.
a biofilm.
a pathogen.
a fomite.
Answer:
it's fomite
Explanation:
hope it helps
3.0X1024 atoms of Au to moles
Answer:
5 moles Au
Explanation:
To convert atoms to moles, simply divide the given number of moles by Avogadro's number , ( 6.022 * 10^23 )
Given number of atoms of Au : 3.0 x 10^24
Number of moles : 3.0 x 10^24 / 6.022 x 10^23 = 5 moles ( rounded )
Which isoelectronic series is correctly arranged in order of increasing radius?.
A) K+ < Ca2+ < Ar < Cl
B) < Ar < K+ < Ca2+
C) Ca2+ < Ar < K+ < Cl
D) Ca2+ < K+ < Ar < Cl
E) Ca2+ < K+ < Cl- < Ar
Answer:D
Find the molecular mass of MgSO4
Answer:
120
Explanation:
Atomic weight of :
Mg=24
S=32
O=16
Molecular mass of MgSO4=24+32+(16*4)=120
Give three examples of stimuli.
Answer: Hit the skin with a needle or pin is a good example of stimulus. The sudden removing of the hand is the response.
When somebody bangs a door you jump if you were unaware because of the sound. ...
Holding a hot plate we fling hand away from it.
Explanation: Hopefully this helps!
what liquid has the density of 900g/L
Answer:
Oil, lubricating
Explanation:
When Sulphur dioxide reacts with water the product formed is
Sulphuric acid
Sulphurous acid
Carbonic acid
None of these
Answer:
2 .Sulphurous acid
Explanation:
Sulphur dioxide can dissolve in water to form Sulfurous acid(H2SO3). sulphurous acid is weackly dibasic acid. sulphur dioxide is a major component of acid rain since it mixes with vapour in the atmosphere reacting to produce H2So4 .
Answer:
Sulphuric acid
Explanation:
Sulphuric acid is a major component of acid rain since it mixes with water vapour in the atmosphere, reacting to produce Sulphuric acid.
Hope that helped...
Solids and liquids are virtually incompressible whereas gases are compressed all the time. Describe why this is true – what special properties of a gas allow this?
Solids and liquids are virtually incompressible whereas gases are compressed all the time, This is true because of their properties of shape volume properties where, Solids have a definite shape and volume, no definite shape and volume.
What are the properties of gas and solids?Generally, Gases are widely dispersed and are not strongly held together atomically.
Therefore, the space occupied can be comprised from one area to another
While Solids are hardly compressible because
They are strongly held and will rather break on tryingBecause their atoms are tightly held there is little or no space to compress to.Read more about volume
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each atom contains a equal number of
When an atom has an equal number of electrons and protons, it has an equal number of negative electric charges (the electrons) and positive electric charges (the protons). The total electric charge of the atom is therefore zero and the atom is said to be neutral.
Answer:
molecules
Explanation:
Each atom contains a equal number of molecules
is my ***** longer than yours?
A: Yes
B: No
A chemist has 2.0 mol of methanol (ch3oh). the molar mass of methanol is 32.0 g/mol. what is the mass, in grams, of the sample? 16 grams 30 grams 32 grams 64 grams
The mass, in grams, of the sample of methanol is 64 grams.
What is relation between mass and moles?Mass of any substance will be calculated by using their moles as:
n = W/M, where
W = required mass
M = molar mass = 32.0 g/mol
n = moles = 2 moles
Now we put all these value on the above equation to calculate the mass of methanol as:
W = (2mol)(32g/mol)
W = 64g
Hence, correct option is (4) i.e. 64 grams.
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The answer to this question is option D: 64 grams
Explanation: Got 90% on the quiz on edge and got this answer right
All are true about how does gravity aid erosion except?
Gravity causes rocks to fall and break apart.
Gravity causes rocks to get larger then breaks it apart.
Gravity causes other soil and sand to move down eroding rocks.
Gravity pulls rainwater down eroding rocks.
Which statement about
destructive interference is true?