Answer:
0.00067mols
Explanation:
firs convert 130mg to grams which is 0.13g, then find the molar mass of caffeine which is 194.19g/mol.
0.13g/194.19gmol=0.0067mols
Whats molecular formula of 26,4% carbon , 3,3 % Hydrogen and 70,3% oxygen?
Explanation: Therefore the molecular formula is twice the empirical formula: C2H6O2. The compound dioxane contains only carbon, hydrogen, and oxygen. When 0.956 g dioxane is burned, 1.91 g carbon dioxide and 0.782 g water are formed. In another experiment, it was determined that 6.04x10-3 mol dioxane weighs 0.532 g.
How many grams of NaOH (MW = 40.0) are there in 500.0 mL
of a 0.175 M NaOH solution?
A) 3.50
B) 114
C) 14.0
D) 2.19x10
Answer:
3.5
Explanation:
500*0.175= 8.75 *40/1000=3500/1000=3.5
Answer:
3.50 grams
Explanation:
Mastering chem
What is the percent yield of LiCl if I produced 30.85g LiCl and my theoretical yield was calculated to be 35.40g LiCl?
Answer:
87.15%
Explanation:
To find percent yield, we can use this simple equation
[tex]\frac{Actual}{Theoretical} *100[/tex]
Where "Actual" is the amount in grams actually collected from the reaction, and "Theoretical" is, well, the theoretical amount that should have been produced.
They give us these values, so to find the percent yield, just plug the numbers in.
[tex]\frac{30.85}{35.40} *100\\\\ =87.15[/tex]
So, the percent yield is 87.15%
An easy trick to remember how to do this is just to divide the smaller number by the bigger number and move the decimal back two places. If you have a percent yield greater than 100%, something is wrong in the reaction.
Convert 678.92 cm into meters
Answer:6.7892 meters
Explanation:
dentify whether each element is a halogen, a noble gas, or nonmetal only.
Astatine (At):
Nitrogen (N):
Krypton (Kr):
Chlorine (Cl):
Sulfur (S):
Astatine : Halogen
Nitrogen : Nonmetal
Krypton : Noble gas
Chlorine : Halogen
Sulfur : Nonmetal
i just needed the points sorryyy
PLEASE HELP WILL GIVG BRAINLEST
Answer:
It is option #1.
Explanation:
Biotechnology is defined as, "The exploitation of biological processes for industrial and other purposes, especially the genetic manipulation of microorganisms for the production of antibiotics, hormones, etc."
Therefore, option #1 is your answer!
How many mL of 0.25 M NaOH would have 0.18 moles of NaOH
Answer:
[tex]720\ \text{mL}[/tex]
Explanation:
M = Molarity of NaOH = 0.25 M = 0.25 mol/L
n = Number of moles of NaOH = 0.18 moles
Volume of solution is given by
[tex]V=\dfrac{n}{M}[/tex]
[tex]\Rightarrow V=\dfrac{0.18}{0.25}[/tex]
[tex]\Rightarrow V=0.72\ \text{L}\times 10^3=720\ \text{mL}[/tex]
The volume of NaOH in the solution is [tex]720\ \text{mL}[/tex].
In hydrogen, in order for an electron to emit visible light, it must fall from
some energy state and stop where?
A. 1st energy level
B. 2nd energy level
C. 3rd energy level
D. 4th energy level
Answer:
B
Explanation:
How does burning affect an object's property? Burning can cause an object to increase in volume. Burning changes the chemical make up of an object. Burning can create the item to increase in mass. Burning keeps the chemical make up of an object the same.
Answer: Burning changes the chemical make up of an object.
Explanation:
A chemical change can be defined as a change in the substance when it combines with other kind of substance to form a new substance. A chemical change can also occur when a substance is broken down into two or more products. These changes cannot be reversed. These changes affect the physical make up of an object. For example, burning as when an object is burned it cannot be transformed into its original form. A wood if burned can be converted into ash, water and carbon dioxide cannot regain its original form after burning so burning brings about chemical change in an object.
what part of the food chain is a mink
a: secondary consumer
b: primary consumer
c:prouducer
d:herbivore
Answer: A secondary consumers
Explanation:
They are carnivores, feeding on primary consumers. The Bobcat, Raccoon, Mink, and Bass are all secondary consumers.
5 points! Please don’t guess if u don’t know!
Salts usually have a low melting point.
A. true
B. false
This is true. that's why we use it for snow
Answer:
false
Explanation:
ya thats why we use it for boiling water
2. How many grams are in 2.05 x 1030 atoms of Lithium (Li)?
help me with this question
In physical and chemical changes, the number of atoms and weight of the object always stays the same.
In a chemical change, the substance changes into a different substance.
I'm pretty sure this next one is can or can not be seperated, depending on what has been mixed. Not positive tho.
what part of the food chain is a lemming
a:producer
b:secondary consumer
c:primary consumer
d: predator
hmm...for your answer I think it would be D
Answer:
primary consumer
Explanation:
Lemmings are primary consumers.
A student pours 800.0 mL of a 3.000 molar solution of sodium hydroxide into a 2.00 liter volumetric flask and fills the flask up with water. What is the new molarity of the solution?
A) 12.00 M
B) 1.20 M
C) 14.00 M
D) 0.0750 M
Predict the shape of the molecule....
Answer: trigonal bipyramidal
Explanation:
Number of electron pairs = [tex]\frac{1}{2}[V+N-C+A][/tex]
V = number of valence electrons present in central atom
N = number of monovalent atoms bonded to central atom
C = charge of cation
A = charge of anion
[tex]SbCl_5[/tex] :
In the given molecule, antimony is the central atom and there are five chlorine as monovalent atoms.
The number of electron pairs are 5 that means the hybridization will be [tex]sp^3d[/tex] and geometry of the molecule will be trigonal bipyramidal.
Concentration is ? 
On a very hot day, could you cool your kitchen by leaving the refrigerator door open?
a. Yes, but it would be very expensive.
b. Yes, but only if the humidity is below 50%.
c. No, the refrigerator would exhaust the same amount of heat into the room as it takes out of the room.
d. No, the heat exhausted by the refrigerator into the room is more than the heat the refrigerator takes out of the room
Answer:c
Explanation:
On a very hot day, No, the refrigerator would exhaust the same amount of heat into the room as it takes out of the room.
What is refrigerator?Eliminating heat from a body but also bringing it down to the lowest temperature actually is the technique of refrigeration. The refrigeration process is carried out in refrigerators.
Therefore, keeping the doorway of an electrical refrigerator open won't help cool the room. In actuality, the refrigerator raises the temperature of the room by removing heat from the freezing compartments as well as rejecting it to the air in the room.
To know more about refrigerator.
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Please help!!! I will mark you brainiest!!!
Answer:
Some positive effects of using synthetic plastic is that scientist can make it softer and biodegradable so that nature can break it down and destroy it so it won't affect the environment. And scientist can also make stronger and tougher in products so they can last longer.
Explanation:
Please help on question 7 and 8, i really need help and this is for marks! I only have 9 min left i will mark brainliest to whoever gives the best answer!
Answer:
I'm going to go with conduction
Explanation:
At first I thought it was combustion but I read the problem incorrectly. It seems like the liquid boils after you put them on the hot plate.
It's most likely conduction because heat and energy is being transferred into the liquid from the hot plate
A word which describes a solution which is more dilute than cytoplasm and would cause a cell to swell with water
Answer:
A hypertonic solution has increased solute, and a net movement of water outside causing the cell to shrink. A hypotonic solution has decreased solute concentration, and a net movement of water inside the cell, causing swelling or breakage.
Explanation: hope this helps :) sorry if it's wrong :(
Which is the correct formula for finding the frequency of an electromagnetic wave? f = c – lambda f = StartFraction lambda over c EndFraction. f = lambda + c f = StartFraction c over lambda EndFraction.
Answer: It's D
Explanation:
Answer:
the answers d if you give brainliest give it to the other person im not worthy of it
Explanation:
help me please i beg u
Answer:
none of the above
Explanation:
an unknown sample with a mass of 50.0 grams changes from an initial temperature of 22.5°C to a final temperature of 32.4°C. It is known that the sample absorbed 444 J and f heat l. Bases on this information, what substance in the table is most likely the identity of this sample?
Answer:
Aluminum
Explanation:
What are the chemical symbols for the elements calcium, carbon, and chlorine respectively? es
A) CL, C, and Ce
B) C, Ca, and Co
C) Ca. C, and CL
D) Ca, Co, and CL
Answer:
C
Explanation:
Match each object to its definition.
A. meteorite
B. meteoroid
C. meteor
->
1. The remains of a rock from space that strikes Earth’s surface
2. A rock that burns up in Earth’s atmosphere
3. A small piece of rock in space
Answer:
definition 1. goes with B. meteoroid
definition 2. goes with C. meteor
definition 3. goes with A. meteorite
Answer: meteoroid - a small piece of rock in space, meteor - a rock that burns up in Earths atmosphere, meteorite - The remains of a rock from space that strike Earth's surface.
Explanation:
When you take off a wool hat, some of the electrons from your hair transfer to
the hat. When this happens, your hair can stand up on end. Why doesn't
gravity hold your hair down?
A. The distance to the center of Earth is vastly larger than between
the hat and your hair,
B. The electrical field caused by the charged hair disrupts the
gravitational field near your hair
C. The electrostatic force is stronger than the gravitational force
between Earth and your hair,
D. The gravitational force between the hat and your hair opposes
Earth's gravitational force,
Answer:
C. The electrostatic force is stronger than the gravitational force
between Earth and your hair
Explanation:
Electrostatic forces are extremely strong. When your hair becomes charged from the electrons, it causes the strands of your hair to repel (push away) from each other because they have like (the same) charges.
16. What is the typical diameter of an atom?
A. | 10-14 m
B. I x 10-12 m
C. | 10-10 m
D. | x 10-8 m
HELPP PLSS
Describe the motion of molecules in these two
substances when the ice cube is placed on the
radiator.
Answer:
When in direct contact, the fast-moving molecules in the radiator collide with the slow-moving molecules in the ice cube. Kinetic energy is transferred from the molecules in the radiator to the molecules in the ice cube, causing a slowdown of the radiator molecules and an acceleration of the ice molecules.
Explanation:
Answer
when in direct contact, the fast-moving molecules in the radiator collide with the slow-moving molecules in the ice cube. Kinetic energy is transferred from the molecules in the radiator to the molecules in the ice cube, causing a slowdown of the radiator molecules and an acceleration of the ice molecules.
Explanation:
Which one of the following is an example of a balanced chemical reaction?
A
C3H60 + 30 2 + 3C0 2 + 3H 20
B 2C 3H 60 + 90 2+ 6CO2 + 6H 20
© C3H60 +90 2 +300 2 +3H 20
D) 2C 3H 60 + 90 2+ 6CO2 + 3H 20
C3H 60 + 40 2 + 3CO 2 + 3H 20
An example of a balanced chemical reaction (equation) is: D. [tex]C_3H_60 + 40_2[/tex] ----> [tex]3CO_2 + 3H_20[/tex]
In Chemistry, a chemical equation is typically used to denote or represent the chemical reaction between two or more chemical elements.
A balanced chemical equation can be defined as a chemical equation wherein the number of atoms on the reactant (left) side is equal to the number of atoms on the product (right) side.
This ultimately implies that, both the charge on each atom and sum of the masses of the chemical compounds or elements in a chemical equation are properly balanced.
Ideally, the first step in balancing a chemical equation is to count the number of atoms in the reactant and product side.
[tex]C_3H_60 + 40_2[/tex] ----> [tex]3CO_2 + 3H_20[/tex]
For reactants:
Carbon = 3 atoms.Hydrogen = 6 atoms.Oxygen = 1 + 8 = 9 atoms.For products:
Carbon = 3 atoms.Hydrogen = 6 atoms.Oxygen = 6 + 3 = 9 atoms.Since, the number of atoms on the reactant (left) side is equal to the number of atoms on the product (right) side, this is an example of a balanced chemical reaction (equation).
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