Answer:
2H^+ +2e -> h2(g)
Explanation:
Since hydrogen is reduced, look for a decrease in oxidation number and the gain of electrons.
Answer:
ZnCl2 + H2
Explanation:
got it correct!
There is 1.00 × 102 mg of caffeine in a shot of espresso. The chemical formula of caffeine is C8H10N4O2. Determine the moles of carbon and hydrogen present in the caffeine in one shot of espresso
Answer:
In one shot of expresso, there are:
4.12 x 10^-3 moles of C atoms
5.15 x 10^-3 moles of H atoms
2.06 x 10^-3 moles of N atoms
1.03 x 10^-3 moles of O atoms
The moles of carbon and hydrogen present in the caffeine in one shot of espresso are 4.11× 10⁻³moles and 5.14× 10⁻³moles respectively.
What is mole?A mole is just a measuring scale. In reality, it is one of the International System for Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created. The levels at which chemical reactions frequently occur exclude the use of grams, yet utilizing actual numbers of atoms, molecules, or ions would also be unclear.
6.02 x 1023 chemistry instructors make up a mole. Anytime we want to make a reference to a lot of different things, it is much simpler to type the word "mole" rather than the number "6.02x1023." In essence, it is the reason this specific unit was created.
caffeine in a shot of espresso = 1.00 × 10² mg/1000=0.1g
mole of caffeine =0.1g÷ 194.19g/mol
=5.149× 10⁻⁴mole
moles of carbon =8×5.149× 10⁻⁴
= 4.11× 10⁻³moles
moles of carbon = 10× 5.149× 10⁻⁴
=5.14× 10⁻³moles
Therefore, the moles of carbon and hydrogen present in the caffeine in one shot of espresso are 4.11× 10⁻³moles and 5.14× 10⁻³moles respectively.
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Select the correct answer.
Which element is more reactive than rubidium (Rb)?
A.
aluminum (Al)
B.
cesium (Cs)
C.
strontium (Sr)
D.
beryllium (Be)
Answer:
B.cesium (Cs)
Explanation:
Reactivity for metals is that it increases as you go down and decreases as you go right.
Answer:strontium (Sr)
Explanation:
what's the difference between viscosity and flow rate
Answer:
Flow rate is how fast a fluid moves. The flow rate can depend on several factors. These factors are the type of fluid that you are using, the force that is pushing on a fluid, the size of the pipe the fluid flows from and the type of surface the fluid flows over. Viscosity is the resistance of a fluid to flow.
Explanation:
just looked it up
Consumers _____.
break down dead material into nutrients
eat only meat
eat other organisms for energy
make their own food
Answer:
Consumers are unable to make their own energy, and instead rely on the consumption and digestion of producers or other consumers, or both, to survive.
Decomposer is an organism, especially a soil bacterium, fungus, or invertebrate, that decomposes organic material. They are all living things that get energy by eating dead animals and plants and breaking down wastes of other animals.
Explanation:
Answer:
A
Explanation:
What is a major problem with CFCs?
A-it is toxic to breathe.
B-It does not readily break down in the atmosphere.
C-It is a greenhouse gas.
D-It isn't a good refrigerant
Given the following equation: 2C6H6 + 1502 - 12CO2 + 6H20
How many moles of O2 are needed to react with 4.0 moles of
Co HG?
a 30 moles
b 12 moles
C 4.0 moles
d 24 moles
Answer:
a) 30 moles
Explanation:
2C6H6 + 1502 -------> 12CO2 + 6H20
from reaction 2 mol 15 mol
given 4.0 mol x mol
x = 4.0*15/2 = 30. mol
earth is one of the planets in the
Answer:
moon obviously
Explanation:
........
Plasma is the most common state of matter in the?
Earth's atmosphere
Earth's crust
oceans
universe
Answer:
Universe
Hope its helpful
Thank you
What is the charge on an electron?
-1
0
+1
+2
Answer:
he charge on an electron is -1. Explanation : Electron is a subatomic particle whose symbol is . The electrical charge on an electron is negative. The electron was discovered by the J.J. Thomson. The mass of an electron is . The charge on electron and proton is equal but opposite. Neutron has zero charge and proton has +1 charge.
Explanation:
A student has a cube with each side is 4 cm in length, what is the volume? What is the measurement unit? Select ALL that apply.
Answer:
64cm^3
Explanation:
To get the volume just multiple 4*4*4
1. MnO₂ is an example of what type of bond?
a covalent
b ionic
c polyatomic ion
2. Cl is an example of a cation, anion, or polyatomic ion
a polyatomic ion
b anion
c cation
Answer:
1. covalent
2. polyatomic ion
Explanation:
:)
Answer:
1) b
2)c
Explanation:
Question 3 of 10
How does air pressure affect the boiling point of a liquid?
A. Air pressure lowers the temperature of the liquid molecules.
B. Air pressure keeps liquid molecules from escaping as a gas.
c. Air pressure decreases the kinetic energy of the liquid molecules.
D. Air pressure prevents diffusion from happening in a gas.
SUBMIT
Air pressure keeps liquid molecules from escaping as a gas, affect the boiling point of a liquid. Therefore, option B is correct.
Why does the boiling point decrease as air pressure decreases?A liquid's boiling point changes depending on the pressure being applied; the normal boiling point is the temperature at which the vapour pressure is equal to the average atmospheric pressure at sea level (760 mm [29.92 inches] of mercury). Water boils at sea level at 100° C (212° F).
The boiling point of a liquid is influenced by the pressure of gas above it. This is referred to as atmospheric pressure in an open system. The higher the boiling point and the more energy is needed to bring liquids to a boil, the higher the pressure.
Thus, option B is correct.
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what is a chemical change of a book
be quick
Answer:
Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. ... An example of a chemical change is the reaction between sodium and water to produce sodium hydroxide and hydrogen.
Explanation:
The five basic types of chemical reactions are combination, decomposition, single-replacement, double-replacement, and combustion. Analyzing the reactants and products of a given reaction will allow you to place it into one of these categories.
Scientists use bacteria to make medicines,
o True
o False
Answer:
true they do I yes they do
PLZ HELP SCHOOL STARTS TMR AND I NEED THIS DONE BY 2NIGHT. ILL GIVE BRAINLIEST
Answer:
Filtration separates solids of different sizes.
Distillation takes advantage of differences in boiling points.
Evaporation removes a liquid from a solution to leave a solid material.
how many moles is 135 L of ammonia gas at STP
Answer:
i
Explanation:
how electronegativity relates to polar bonding
Consider the reaction X + Z ?
Assume the following:
1) The product is an ionic compound.
2) Element X has three valence electrons
3) Element Z needs two valence electrons to have completed s & p subshells (full octet)
What would make the most sense for the formula of the product?
Answer:
X2Z3
Explanation:
Based on the clues, X is a metal and Z is a non-metal.
X could be aluminum and Z would need to be an element from the oxygen family.
There are
groups and
periods in the periodic table.
Answer:
I do not understand but,
Explanation:
There are 18 groups, 18 columns, and 118 elements at the time of this response.
Here is a map of the periodic table for any more help that you might need.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
two difference between simple cell and dry cell
Explanation:
Simple cell has liquid chemicals and it is difficult to carry from one place to another. Dry cell has no solution. So, it is easier to carry it from one place to another and there is no risk of spilling acid from the dry cell.
how do we know that a chemical reaction occured
Answer: signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.
Explanation:
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3. What might be the formula for calculating speed?
4. What might be the formula for calculating distance?
spe
5. What might be the formula for calculating time?
(m/s)
6. What might be the units for speed?
Answer:
3)The formula for speed is
speed=distance ÷ time
distance is in metres (m)
and time is in seconds (s),
so the units will be in metres per second (m/s).
4)to solve for distance use the formula for distance d = st, or distance equals speed times time. ... You can use the equivalent formula d = rt which means distance equals rate times time. distance = rate x time.
5)To solve for time use the formula for time,
t = d/s which means time equals distance divided by speed.
6)The SI unit of speed is the metre per second, but the most common unit of speed in everyday usage is the kilometre per hour.
please mark me as a brain list
Knowing that the molar mass of the compound is 46.069 grams/mole, use the formula weight calculated in part C to
determine the molecular formula.
Select the correct answer from each drop-down menu.
С_H_O_
Answer:
C2H2O1
Explanation:
I got it right on plato :>
C2H6O1 is the correct answer.
You have the compound CH4. The first element is a
(metal, nonmetal) and the second element is a
(metal, nonmetal). You would predict that this would form a(n).
(ionic, covalent) bond.
ASAP
Answer:
1. Nonmetal
2. Nonmetal
3. Covalent
Explanation:
CH4 is the chemical formula for the methane molecule in which four atoms of hydrogen is chemically bonded to one atom of carbon. Both carbon, which is the first element and hydrogen the second element are non-metals, and hence can only form a covalent bond.
A covalent bond is a type of chemical bond in which two atoms share their valence electrons. It occurs between two non metallic atoms. In this molecule, CH4, carbon and hydrogen share their valence electrons to form a covalent bond.
Mass of the Graduated Cylinder
(only air)(g) Mass of the Graduated Cylinder with
Water (g) Calculated Mass of Water (g)
73.7 73.7 0.0
A student collected the above data for this experiment. What error did he make? Explain.
Answer:
If there is water in the graduated cylinder and what is required is the exact amount of water, then the instrument used to measure the mass is not that accurate. Having only one decimal place is not enough to detect the mass of water in the cylinder.
Explanation:
Explain the ratio of calcium ions to chloride ions in CaCl2
Answer:
The ionic formula for Calcium Chloride is
C
a
C
l
2
Calcium is an Alkaline Earth Metal in the second column of the periodic table. This means that calcium has 2 valence electrons it readily gives away in order to seek the stability of the octet. This makes calcium a
C
a
+
2
cation.
Chlorine is a Halogen in the 17th column or
p
5
group.
Chlorine has 7 valence electrons. It needs one electron to make it stable at 8 electrons in its valence shells. This makes chlorine a
C
l
−
1
anion.
Ionic bonds form when the charges between the metal cation and non-metal anion are equal and opposite. This means that two
C
l
−
1
anions will balance with one
C
a
+
2
cation.
This makes the formula for calcium chloride,
C
a
C
l
2
.
I hope this is helpful.
How many grams of C are there in 0.234 moles of caffeine?
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which value of gas constant (R)use and when ?
in ideal gas equation.
Answer:
R is universal gas constant
It is has fixed value which would depend upon the units in which P,V and T expressed in the equation PV=nRT
R=
nT
PV
Answer:
value of R=0.0821atm,mol-¹k-¹
James has opened the valve on the propane tank for his BBQ grill. He later notices how cold the top of the tank feels. What is the reason for this?
A) The liquid inside is condensing; losing energy to overcome the interactions holding them together
B) The liquid inside is vaporizing; losing energy to overcome the interactions holding them together.
C) The liquid inside is vaporizing; gaining energy to overcome the interactions holding them together.
D) The liquid inside is freezing; gaining energy to overcome the interactions holding them together
Answer: D
Explanation:
D
Which element is in the same group as carbon?
look at the attached photo
Answer:
B. Germanium
Explanation:
Since the carbon group element consists of carbon, germanium, etc. Germanium is in the same group as carbon.