Answer:
Explanation:
density = mass (g)/ volume (cm3)
2.1 = mass / 20 cm3
mass = 42 g
be attention that each 1 ml =1cm3
In J.J. Thomson's plum pudding model of the atom, the plums represent
and the pudding represents
A
large neutral charged mass, large positively charged mass
B)
large positively charged mass, electrons
electrons, large positively charged mass
electrons, large neutrally charged mass
Answer:c
Explanation:
I put a and got it wrong and c was correct
J.J. Thomson gave the plum pudding model for the atomic structure. The model represents the plums by electrons and pudding as large positively charged masses. Thus, option c is correct.
What is the Plum pudding model?The Plum pudding model was given by J.J. Thomson to represent the sub-atomic particles of the atom and their distribution. The plum was used to depict the electrons that carried a negative charge.
The pudding represented the protons that were present like the sea and covered the whole atom. The protons carried a positive charge and according to the model were distributed fully in the atom.
It was an important discovery and model that gave rise to more accurate models. The model proposed the presence of the electrons that later were considered of crucial importance.
Therefore, option c. the plum is electron embedded in the pudding of the protons.
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i need help please with questions 35+38
Answer:
vznzbzvbajavavsytttuydr
Label each carbon atom with the appropriate geometry. Bin 1 points to a carbon bonded to a double bonded carbon and single bonded to two hydrogens. Bin 2 points to a carbon double bonded to a carbon and single bonded to a carbon and one hydrogen. Bin 3 is a carbon single bonded to two carbons and single bonded to two hydrogens. Bin 4 is the same as bin 3. Bin 5 is a carbon triple bonded to a carbon and single bonded to a carbon. Bin 6 is triple bonded to a carbon and single bonded to a hydrogen.
Answer:
Bin 1 points to a carbon bonded to a double bonded carbon and single bonded to two hydrogens. --- trigonal planar, tetrahedral
Bin 2 points to a carbon double bonded to a carbon and single bonded to a carbon and one hydrogen.------- trigonal planar, tetrahedral
Bin 3 is a carbon single bonded to two carbons and single bonded to two hydrogens. ----- tetrahedral, tetrahedral
Bin 4 is the same as bin 3.--------tetrahedral, tetrahedral
Bin 5 is a carbon triple bonded to a carbon and single bonded to a carbon.---- linear, tetrahedral
Bin 6 is triple bonded to a carbon and single bonded to a hydrogen.---linear, tetrahedral
Explanation:
A single C-C or C-H bond is in a tetrahedral geometry, the carbon atom is bonded to four species with a bond angle of 109°.
A C=C bond is trigonal planar with a bond angle of 120°.
Lastly, a C≡C bond has a linear geometry with a bond angle of 180° between the atoms of the bond.
On a rollercoaster ride, when do the cars have the most kinetic energy?
There are three stable isotopes of magnesium. Their masses are 23.9850, 24.9858, and 25.9826 u. If the average atomic mass of magnesium is 24.3050 u and the natural abundance of the lightest isotope is 78.99%, what are the natural abundances of the other two isotopes?
Answer:
²⁵ Mg = 10.00%
²⁶ Mg = 11.0%
Explanation:
Given that:
Magnesium ²⁴Mg has an abundance of 78.99%
Hence, (100 - 78.99)% = 21.01%
21.01% is the abundance of ²⁵ Mg and ²⁶ Mg
Suppose,
²⁵ Mg = x
²⁶ Mg = (21.01 - x)%
Then;
avg. atomic mass = [tex]\dfrac{78.99}{100 }(23.9850)+\dfrac{x}{100}(24.9858) +\dfrac{21.01-x}{100}(25.9826)[/tex]
where the avg. atomic mass = 24.3050
∴
[tex]24.3050 \times 100 = {78.99}(23.9850)+\dfrac{x}{100}(24.9858) +\dfrac{21.01-x}{100}(25.9826)[/tex]
2430.5 = 2440.46915 -0.9968 x
0.9968x = 2440.46915 - 2430.5
0.9968x = 9.96915
x = 9.96915/0.9968
x = 10.00%
∴ Recall that:
²⁵ Mg = x
²⁶ Mg = (21.01 - x)%
²⁵ Mg = 10.00%
²⁶ Mg = (21.01 - 10.00)%
²⁶ Mg = 11.0%
The natural abundances of the other two isotopes, that is, Mg-25 and Mg-26 are 10% and 11.01%.
What is Natural abundance?It is the abundance of isotopes of a chemical element as naturally found on a planet.
Based on the given information:
The three stable isotopes of Mg are Mg-24, Mg-25 and Mg-26. The natural abundance of the lightest isotope, that is, Mg-24 is 78.99%. The masses of the isotopes are 23.9850 u, 24.9858 u and 25.9826 u. The average atomic mass of Mg is 24.3050 u.Now the natural abundance of all the isotopes of Mg is 100%.
Mg-24 + Mg-25 + Mg-26 = 100
Mg-25 + Mg-26 = 100-78.99
Mg-25 + Mg-26 = 21.01
Now let us assume that Mg-25 is x% then Mg-26 will be (21.01% -x).
Now,
Average atomic mass of Mg = [(Natural abundance of Mg-24) × (isotopic mass of Mg-24) + (Natural abundance of Mg-25) × (Isotopic mass of Mg-25) + (Natural abundance of Mg-26) × (Isotopic mass of Mg-26)]
Putting the values we get,
24.3050 amu = (78.99% × 23.9580 amu) + (x% × 24.9858 amu) + (21.01% - x%) × 25.9826 amu
24.3050 amu = 18.9458 + 24.9858 × x + 5.4589 - (25.9826x)
24.3050 = 24.4047 - (0.9968x)
0.9968x = 24.4047 - 24.3050
x = 0.1000
x = 10%
The natural abundance of Mg-25 is 10%.
The natural abundance of Mg-26 = 21.01% - x% = 21.01% - 10% = 11.01%.
Thus, the natural abundances of the other two isotopes are 10% and 11.01%.
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Taylor saw a raccoon in her backyard last weekend. She put
out some food and a bowl with 360 milliliters (ml) of water in
it. The raccoon ate all the food and drank 1/3 of the water.
How much water did the raccoon drink?
Answer:
The raccoon drank 120 ml of water.
Explanation:
All you have to do is take the 360 ml of water and to find what 1/3 of it is you divide 360 by 3 to get 120 ml of water.
Hope that helps and have a great day!
Un buzo que nada en las profundidades despide pequeñas burbujas de aire¿Aumenta disminuye o permanece igual el tamaño de las burbujas conforme suben a la superficie?
Answer:
Al ascender las burbujas van aumentando de tamaño.
Explanation:
Las burbujas que produce el buzo debajo del agua son pequeñas moléculas de dióxido de carbono gaseoso producto de la respiración del mismo.
Ahora, a medida que las burbujas suben a la superficie, la presión que sufren estas (Presión debido al agua), es menor conforme van ascendiendo debido a la ley de Boyle: A medida que la presión aumenta, el volumen va disminuyendo.
Esto significa que al ascender las burbujas van aumentando de tamaño debido a que la presión que sufren estas es menor que cuando están a mayores profundidades.
Which of the following describes the characters of a solid A. Particles are packed closely together in an organized way and maintain their size shape and volume. B. Particles are relatively close together, filling the container from the bottom up, and have a definite volume. C. Particles are changed and spread out from each other, taking the shape and volume of the container. D. Particles are spread out from each other, taking the shape and volume of the container
The answer to your question is:
Answer:
A. Particles are parked closely together in an organized way and maintain their size, shape and volume.
Explanation:
These are some characteristics of a solid;
A solid has a fixed volume.Particles are closely parked and in an organized way. Solids maintain their shape and size [not like liquids and gases that take the shape of their container]. Hope it helps!!Please mark me as the brainliest!!!✨Thanks!!!!❤✨
Although alchemy has many definitions, including a way of thinking philosophically about stuff by changing it, what word that is still used today is derived from alchemy?
Answer:
ChemistryExplanation:
Chemistry is derived from Alchemy. Alchemy is derived from al-chemiya, Kimiya is an Arabic word.
Chemistry is branch of science that involves study of structure of atoms and molecules, investigation of their properties , the changes that occur during chemical reactions and using the chemical reactions to form new substances. It has five branches: Analytical, Organic, Inorganic, Physical and Biochemical.
What are the answers for this
Answer:
Solid:
shape: definite
volume:definite
closeness...: tightly packed
motion ..: vibrate in their position
liquid:
shape: indefinite
volume: definite
closeness: loosely packed
motion... : slide past each other
gas:
shape: indefinite
volume: indefinite
closeness: far apart
motion..: random movement
Explanation:
hope this helped you .. please mark as brainliest
Iodine has a density of 4.94 g/mL. What is its density in lb/gal? (1 gal= 3.785 L and 1 lb = 454 g)
Answer:
Try using this formula so useful.
Explanation:
Particles = atoms/molecules etc.
A= is your given
B= is what you want
A balloon is filled with 2.00 L of helium gas at sea level, 1.00 atm and 12.0ºC. The balloon is released and it rises to an altitude of 30,000 ft. If the pressure at this altitude is 0.300 atm and the temperature is -55.0ºC, what is the volume of the balloon?
Answer:
THE VOLUME OF THE BALLOON IS 1.45 L
Explanation:
At sea level:
Volume = 2 L
Pressure = 1 atm
Temperature = 12 °C
At 30000 ft altitude:
Pressure = 0.30 atm
Temperature = -55°C
Volume = unknown
Using the general gas formula:
P1 V1 / T1 = P2 V2 / T2
Re-arranging the formula by making V2 the subject of the equation, we have;
V2 = P1 V1 T2 / T1 P2
V2 = 1 * 2 * 12 / 0.30 * 55
V2 = 24 / 16.5
V2 = 1.45 L
The volume of the balloon at the temperature of -55 C and 0.30 atm is 1.45 L
Linh is analyzing a solution in a crime lab. He needs to determine what liquid was used to dissolve the other substances. Which method would best complete the task?
evaporation
filtration
decantation
distillation
Answer:
D is the answer
Explanation:
distillation
Answer:
distillation
Explanation:
Which of the following is not an example of making a measurement?
Answer:
C
Explanation:
Measurements are always specific numerical values that you observe. Taking your temperature results in a number. Reading your watch results in a specific time that you get. Weighing a cantaloupe results in a specific measurement in kilograms or pounds. Asking the weather will result in an answer, like sunny or rainy, which aren't specific numerical values.
The following is not an example of making a measurement is asking for weather as it depends on weather reports. option C is correct.
What is weather report?A weather report is what tells you about the high and low temperatures for the past day o weather the rain is going to happen or not which can be predict only.
Weather report also tells you the present temperature of the day and may tell you the average temperature for the day which can only be predict cannot be measured in any aspect.
Therefore, following is not an example of making a measurement is asking for weather as it depends on weather reports. option C is correct.
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A gas has an initial volume of 50.0 liters, a temperature of 65 Kelvin, and a pressure of 805
Torr. If the pressure is increased to 1244 Torr, and the temperatures to 92.2 Kelvin, what would
the new volume be for this gas?
Answer:
its 459 L
Explanation:
When sugar is fermented, alcohol is produced. What other substance is produced? Also.. What effects does this substance have in (i) baking (ii) beer brewing.
ANSWER: It's (ii) I do believe
The sugar is fermented and the ethanol and carbon dioxide are produced. The fermentation of ethanol is used in bread baking and the fermentation found in grapes makes beer.
What is fermentation?Fermentation is the mechanism by which sugar is converted into alcohol. Ethanol Fermentation can be described as a biological process that converts sugars such as glucose, sucrose, and fructose into cellular energy by producing ethanol and carbon dioxide as a side effect.
Alcoholic fermentation is called anaerobic since yeast conducts this transformation in the absence of oxygen. The fermentation of ethanol has applications such as the manufacture of alcoholic drinks, ethanol fuel manufacture, and bread baking.
Fermentation of the natural sugars can be seen in grapes creating wine or beer as well as in apples and pears producing cider and Perry, respectively. Alcoholic fermentation takes place in species of fish, where it offers energy when oxygen is scarce.
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Atoms of two different elements must have different electrical charges. numbers of neutrons. atomic numbers. energy levels.
Answer:
atomic numbers
Explanation:
Atoms are the unit of molecules and compounds or matter. They have their atomic numbers and mass. Atoms of different elements must have different atomic numbers. Thus, option C is correct.
What is an atomic number?An atomic number is the total number of protons in a nucleus that is an essential factor in determining the place and position of the atom in the periodic chart.
Though the nucleus is made of neutrons and protons, the atomic number is only defined by the number of protons alone. Hence, the number of protons is equivalent to the atomic number.
The number of the protons and neutrons together makes the atomic mass of the element that is expressed at the lower of the symbol, whereas the atomic number is written at the upper of the symbol.
Therefore, the atomic number is different in each atom.
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You have $7.25 in your pocket in quarters. How many quarters do you
have? (Given, 1$= 4 Quarters)
Answer:
29
Explanation:
$1=4 quarters
$7 = 28 quarters ( multiply 7 times 4)
.25 = 1 quarter
add 28 and 1
Answer:29
Which of the following is a unit of volume in the metric system? (5 points)
Gallon
Liter
Pint
Quart
A litre is a unit of volume in the metric system. Hence, option B is correct.
What is volume?Volume – How much space an object or substance takes up.
Measured in cubic meters (m3), litres (L) & millilitres (mL).
Volume is the measure of the 3-dimensional space occupied by matter, or enclosed by a surface, measured in cubic units.
The SI unit of volume is the cubic meter (m3), which is a derived unit.
Volume is the measure of the capacity that an object holds.
For example, if a cup can hold 100 ml of water up to the brim, its volume is said to be 100 ml.
Volume can also be defined as the amount of space occupied by a 3-dimensional object.
Hence, option B is correct.
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True or False: when steam condenses into a liquid, heat is given off to the environment.
Answer:
true.
Explanation:
if an atom has two additional valence electrons than the original element has, what would be the charge of the atom
A student is trying to determine the identity of some pieces of an unknown
substance by finding their density. He finds the mass of a weighing boat to
be 2.69 g and the mass of the unknown pieces, including the weighing
boat, to be 18.01 g. To find the volume of the pieces, he measured out 25.7
mL of water in a graduated cylinder and then added the pieces to find a
new volume of 32.3 ml. What is the identity of the substance?
Density
2.16
Mineral
Halite
2.32
Gypsum
Quartz
2.65
2.72
Calcite
3.18
Fluorite
O halite
O quartz
O
O gypsum
fluorite
juju
Answer : The identity of the substance is gypsum.
Explanation : Given,
Mass of weighing boat = 2.69 g
Mass of unknown pieces including weighing boat = 18.01 g
Initial volume = 25.7 mL
Final volume = 32.3 mL
First we have to calculate the mass of unknown pieces.
Mass of unknown pieces = Mass of unknown pieces including weighing boat - Mass of weighing boat
Mass of unknown pieces = 18.01 g - 2.69 g
Mass of unknown pieces = 15.32 g
Now we have to calculate the volume of unknown pieces.
Volume of unknown pieces = Final volume - Initial volume
Volume of unknown pieces = 32.3 mL - 25.7 mL
Volume of unknown pieces = 6.6 mL
Now we have to calculate the density of unknown pieces.
[tex]\text{Density of unknown pieces}=\frac{\text{Mass of unknown pieces}}{\text{Volume of unknown pieces}}[/tex]
Now putting all the given values in this formula, we get:
[tex]\text{Density of unknown pieces}=\frac{15.32g}{6.6mL}[/tex]
[tex]\text{Density of unknown pieces}=2.32g/mL[/tex]
From the given table we conclude that the unknown piece is gypsum whose density is 2.32 g/mL.
Therefore, the identity of the substance is gypsum.
The material with the density equivalent to the unknown piece has been Gypsum. Thus, the unknown piece has been gypsum.
Density can be defined as the mass of the substance per unit volume.
To calculate the density of the unknown piece, the mass has been calculated as:
Mass of unknown piece = Mass of weighing boat with the unknown piece - Mass of weighing boat
Mass of unknown piece = 18.01 g - 2.69 g
Mass of unknown piece = 15.32 grams.
The volume of the unknown piece can be calculated as:
The volume of unknown piece = Final volume - Initial volume
The volume of the unknown piece = 32.3 mL - 25.7 mL
The volume of the unknown piece = 6.6 mL.
The density can be expressed as:
Density = [tex]\rm \dfrac{Mass}{Volume}[/tex]
The density of the unknown piece = [tex]\rm \dfrac{15.32\;g}{6.6\;ml}[/tex]
The density of the unknown piece = 2.32 g/mL.
From the given set of pieces, the material with the density equivalent to the unknown piece has been Gypsum. Thus, the unknown piece has been gypsum.
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9. The identity of an element can be determined on the basis of which one of the following?
A) The number of protons in an atom of the element.
B) The number of neutrons in an atom of the element.
C) The mass number of the element.
D) The atomic mass of the element.
Gravitational attraction exists between all objects in the universe. Which word, if any, should replace "all" in this statement to make the statement true.
Answer:
any two
Explanation:
Gravitation force or gravitational attraction is a force of pulling or attraction that exist between any two bodies that have a mass. Each and every body attract each other with the force of gravity due to their masses.
Every object in this universe having mass and distance attracts every other object.
Which is denser? Object A = 0.1191047619047619 Object B = 0.1875
Answer:
B- 0.1875 is denser.
hope this helps
What does conserving mass mean in a chemical equation?
Answer:
The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
Explanation:
hope that helps
Which element has the greatest average atomic mass? iodine bromine tellurium krypton
Answer:
The answer is C. Tellurium.
Explanation: If you look at the periodic table, tellurium is shown to have the greatest atomic mass. It is calculated easily. The answer is right on edge 2020.
Tellurium is the element having highest atomic mass.
Tellurium is the element has the greatest average atomic mass followed by iodine, krypton and bromine. The atomic mass of Tellurium is 127.6 u, the atomic mass of iodine is 126.9 u, the atomic mass of krypton is 83.8 u and the atomic mass of bromine is 79.9 u so on the basis of given data we can say that tellurium is the element that has the highest atomic mass or mass number.
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Which of the following atoms has a full outer shell?
A. Ca
B. Li-1
C. Mg+2
D. N-2
Magnesium ( Mg+² ) has a full outer shell .
Reason:-K and L shells of an atom are full , then it will have a total of 2 + 8 = 10 electrons in it . We know that magnesium has 12 electrons in it . Magnesium having 2 free electrons.
Choose the correct description of elements from the options below. Select the correct answer below:
A) They can only be monoatomic.
B) They can only be diatomic.
C) They are mixtures.
D) They contain only one type of atom.
Answer:
ill say a
Explanation:
it make the most cense
They can only be monoatomic.
Are all elements monatomic?Nearly all elements form monatomic gases at extremely high temperatures or when exposed to enough radiation because there's too much kinetic energy for bonds to form or the energy breaks chemical bonds between atoms.
Are elements diatomic?There are seven diatomic elements given below
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546000000 in scientific notation
Answer:
5.46x[tex]10^{8}[/tex]
Explanation:
just move the decimal however many places to the left until there is only one digit to the left of it and then square the ten by that number