Answer:9
Explanation:
F is Flourine on the periodic table; the atomic number of Flourine is 9
caution: when you say “20 F” your meaning is unclear. regardless of what you mean, though, the atomic number of F is 9
what are invertebrate? give any three example.
Answer:
Invertebrates are animals which do not have vertibral column. They do not debelop it also. For example: Arthropods , Crawfish and Sea Urchin.
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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Is this a balanced equation?
Answer:
The equation is not balanced.
Explanation:
The Law of Conservation of Matter is also called the law of conservation of mass or the Lomonosov-Lavoisier Law. This law postulates that "the mass is neither created nor destroyed, it only transforms." This means that the reactants interact with each other and form new products with different physical and chemical properties than the reactants because the atoms of the substances are arranged differently. But the amount of matter or mass before and after a transformation (chemical reaction) is always the same, that is, the amounts of the masses involved in a given reaction must be constant at all times, not changing in their proportions when the reaction ends. . In other words, then the mass before the chemical reaction equals the mass after the reaction. The exception to the rule is nuclear reactions, in which it is possible to convert mass into energy and vice versa.
This is, te law of conservation of matter states that since no atom can be created or destroyed in a chemical reaction, the number of atoms that are present in the reagents has to be equal to the number of atoms present in the products.
Then, you must balance the chemical equation. For that, you must first look at the subscripts next to each atom to find the number of atoms in the equation. If the same atom appears in more than one molecule, you must add its amounts.
The coefficients located in front of each molecule indicate the amount of each molecule for the reaction. This coefficient can be modified to balance the equation, just as you should never alter the subscripts.
By multiplying the coefficient mentioned by the subscript, you get the amount of each element present in the reaction.
Then, taking into account all of the above, you can determine the amount of elements on each side of the equation:
Left side: 2 hydrogen H and 2 oxygen O
Right side: 2 hydrogen H and 3 oxygen O
Since the quantity of each element is different on each side of the reaction, the equation is not balanced.
The balanced equation is:
2 H₂O₂ → 2 H₂O + O₂
Which property is typical of a covalent compound?
A.
They are extremely hard solids.
B.
They have low melting and boiling points.
C.
They conduct electricity.
D.
They have rigid crystal structures.
E.
They exist only as gases and liquids.
Answer:
low m.p and b.p
Explanation:
hope u like the ans
Answer:
The property that covalent compound is they have low melting and boiling points
(a) Give the H-C-O bond angle in methyl formate H-C-O bond angle methyl formate
(b) One dihedral angle in methyl formate relates the plane containing the O-C- O bonds to the plane y two structures of methyl formate: one in which this dihedral angle containing the Co-onds, identand the other in which it is 180 0° dihedral angle 80" dihedral angle.
Answer:
Explanation:
The bond angle is said to be the angle between two atoms near or around the same atom for a given covalent compound. However, a dihedral angle is known as the angle formed between two planes. Bond angles are usually planar while dihedral angles are interplanar.
The diagram below shows the structure of each compound.
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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A prokaryotic cell does not have
А
a cell membrane.
B
genetic material.
C
a nucleus.
D
flagella.
Answer:
D
Explanation:
Help me, I’m bad a science.
Answer:
Removing the worms is they first key to overcoming this problem. Thus you should ensure that the worms have not spread throughout the house/facility, or caused more damage.
Secondly, you should replace the pipes taht the worms got into, or clean them at most. If it’s simply worm droppings then just clean it, but if it’s more and worse than that alike slime then it is best to remove and replace it.
the only way the worms escaping could affect something is if they decontaminated it, or alas ate or destroyed it. Other than that if they died you could simply replace them, but e things cannot be replaced
Explanation:
You didn’t actually tell us any details so that the best I got from that
can I have brainlest pwease?
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
Which coefficient placed before HCl will balance the following
equation? Zn+HCI ZnCl2 + H2
Explanation:
Given chemical equation
Zn + HCL ➡ ZnCl2 + H2
Now balancing
Zn + 2HCL ➡ ZnCl2 + H2
Hope it will help :)❤
The coefficient placed before HCl which makes the equation to be balanced is 2.
To know which coefficient will be placed before HCl to balance the equation, we shall simply balance the equation given from the question.
Zn + HCl —> ZnCl₂ + H₂
The above equation can be balance as illustrated below:
There are 2 atoms of H on the right side and 1 atom on the left side. It can be balance by writing 2 before HCl as shown below:
Zn + 2HCl —> ZnCl₂ + H₂
Now, the equation is balanced.
From the balanced equation above, the coefficient written before HCl which makes the equation to be balance is 2.
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Which chemical reaction below demonstrates the combustion of a hydrocarbon?
How many moles are in 35.6 g of H2O
Answer:
Given
mass of H2O (m) =35.6g
molarmass (mr) = H2O ), 1x2+16=18g/mol
moles of H2O (n) =?
sln
n=m/mr
n=35.6g/18g/mol
n=1.978moles
the moles of H2O are 1.978moles
what is the molar mass of Mg(NO2)2?
Answer:
116g/mol
Explanation:
Mg=24
NO2=46
multiple 46 by 2and then add 24
The molar mass of Mg(NO₂)₂ is 116.33 g/mol.
To calculate the molar mass of Mg(NO2)2, we need to determine the atomic masses of each element in the compound and multiply them by their respective subscripts.
The atomic masses of the elements involved are:
Mg (magnesium) = 24.31 g/mol
N (nitrogen) = 14.01 g/mol
O (oxygen) = 16.00 g/mol
The compound Mg(NO₂)₂ contains one magnesium atom (Mg), two nitrate ions (NO₂), and each nitrate ion contains one nitrogen atom (N) and two oxygen atoms (O).
Molar mass of Mg(NO₂)₂ :
Mg: 1 × 24.31 g/mol = 24.31 g/mol
N: 2 × 14.01 g/mol = 28.02 g/mol
O: 4 × 16.00 g/mol = 64.00 g/mol
Now, add up the individual masses:
24.31 g/mol + 28.02 g/mol + 64.00 g/mol = 116.33 g/mol
Therefore, the molar mass of Mg(NO₂)₂ is 116.33 g/mol.
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Please help me fast...
B) 1 and 3
it's the right answer
Answer:
For 3rd question, the answer is option D
the bus will stop here into question tag
Answer:
the bus will stop here, wouldn't it?
ZN + HCI —> ZnCI2+ H2
what is the reaction and is it balanced?
PLEASE HELP Is this a redox reaction?
Zn + 2 HCl → ZnCl2 + H2
Answer:
answer is #4
Explanation:
Zn^0 -------> Zn^2+ ,
H^1+ --------> H^0
The diagram shows a vertical number line. A vertical line with arrowheads at both ends has tick marks every 4 units with the tick marks for negative 4, 0, 8 labeled. The tick mark two past 8 has an X next to it. What is the position of point X? –16 –12 12 16
Answer:
16
Explanation:
Answer:
its 16
Explanation:
i took the quiz and it was right
Suppose your friend investigated the color of
pea pods and concluded that green pods (G) were
dominant over yellow pods (g). What experimental
evidence would be needed to support this
conclusion?
Help pls!!
Answer:
Wag kang tatalon Kasi malayu ang talunan mo
How are mixtures and solutions different from each other?
A. there are no differences
B. one combiner chemically the other combines electronically
C. They have more than one element in them
D. the mixture can be separated and the solution is not easily separated
What affects both deep water and surface currents in the ocean?
Answer:
These currents are on the ocean's surface and in its depths, flowing both locally and globally. Winds, water density, and tides all drive ocean currents. Coastal and sea floor features influence their location, direction, and speed. Earth's rotation results in the Coriolis effect which also influences ocean currents. -
Answer: The Coriolis effect
Explanation:
The ____________________ package and distribute materials to other parts of the cell.
24. In our experiment, we filled 4 tubes with water and bromothymol blue.
Tube 1 did not contain an organisms, tube 2 contained a snail, tube 3
contained a elodea and tube 4 contained both a snail and elodea. What
tubes could photosynthesis occur in?
O Tubes 3 and 4
O Tubes 2 and 4
O Tubes 2, 3, and 4
Answer:
C. Tubes 2, 3, and 4
Explanation:
Tube one doesn't contain an organism so it can't be that one.
Both a snail and an elodea are considered an organism, cellular respiration occurs in almost any organism's cells.
good luck, i hope this helps :)
What happens when chlorine solution is added to a solution of sodium bromide?
A)No reaction
B)An explosion
C)Bromine is produced
Answer:
Sodium chloride is produced
Answer:
b
Explanation:
A skateboarder coasts a distance of 20 meters in 4 seconds. What is the person's speed?
Answer:
5
Explanation:
20/4
A sample of gas at 3000.0mmHg inside a steel tank is cooled from 500.0°C to 0.00°C what is the final pressure of the gas in the steel tank
Answer:
1429.32 mmHg
Explanation:
Initial Pressure P1 = 3000.0mmHg
Initial Temperature T1 = 500.0°C + 273 = 573 K ( Converting to kelvin temperature)
Final Temperature T2 = 0.00°C + 273 = 273 K ( Converting to kelvin temperature)
Final Pressure P2 = ?
The pressure of a given amount of gas is directly proportional to the absolute temperature provided volume remains constant.
This is given by the mathematical expression;
P1 / T1 = P2 / T2
Inserting the values;
3000 / 573 = P2 / 273
P2 = 273 * 3000 / 573
P2 = 1429.32 mmHg
Describe the effects of anaerobic respiration on the body and explain the effects on the body
Answer:
In anaerobic respiration, glucose breaks down without oxygen. The chemical reaction transfers energy from glucose to the cell. Anaerobic respiration produces lactic acid, rather than carbon dioxide and water. Unfortunately this can lead to painful muscle cramps.
please mark my anSwEr as brainlist
Answer:
In anaerobic respiration, glucose breaks down without oxygen. The chemical reaction transfers energy from glucose to the cell. Anaerobic respiration produces lactic acid, rather than carbon dioxide and water. Unfortunately this can lead to painful muscle cramps.
Explanation: Living things need energy for everything they do, including growing and reproducing. This energy comes from glucose. All animals and humans get glucose through eating it, but plants need to make their own glucose during photosynthesis.
Plants and animals transport glucose and oxygen to tiny structures in their cells, called mitochondria. Here, the glucose and oxygen take part in a chemical reaction. The reaction is called aerobic respiration, and it produces energy which transfers to the cells.
Aerobic respiration makes two waste products:carbon dioxide and water. Animals remove carbon dioxide from their bodies when they breathe out. In daytime, plants use some of this carbon dioxide for photosynthesis. At night, they release the carbon dioxide to their surroundings.
Balance the folowing equation.
S + 02
ws
SO:
Answer:
s+o2=so2
Explanation:
i hope it will help u
How many moles are in 15.62g of P?
Answer:
[tex]\boxed {\boxed {\sf 0.5043 \ mol \ P}}[/tex]
Explanation:
To convert from moles to grams, we must use the molar mass. This is found on the Periodic Table. Look for Phosphorous or P.
Phosphorus (P): 30.973762 g/molWe can use this number as a ratio.
[tex]\frac{30.973762 \ g \ P }{1 \ mol \ P}[/tex]
Multiply by the given number of grams: 15.62
[tex]15.62 \ g \ P *\frac{30.973762 \ g \ P }{1 \ mol \ P}[/tex]
Flip the fraction so the grams of phosphorus cancel.
[tex]15.62 \ g \ P *\frac{1 \ mol \ P}{30.973762 \ g \ P }[/tex]
[tex]15.62 *\frac{1 \ mol \ P}{30.973762 }[/tex]
[tex]\frac{15.62 \ mol \ P}{30.973762 }[/tex]
Divide.
[tex]0.504297799 \ mol \ P[/tex]
The original measurement of grams has 4 significant figures, so our answer must have the same.
For the number we calculated, that is the ten thousandth place. The 9 in the hundredth thousandth place tells us to round the 2 to a 3.
[tex]0.5043 \ mol \ P[/tex]
There are 0.5043 moles of phosphorus in 15.62 grams.
who likes chicken nuggets
Answer:
me especially the dino ones
Explanation: