Answer:
C
Explanation:
I asked my teacher
The number of protons in an atom are always whole numbers hence it is impossible for an element to have an atomic number of 110.5. The correct answer is option D: Atoms of an element all have the same whole number of protons.
We define the atomic number as the number of protons in an atom. The number of protons in all the atoms of en element must be a whole number.
There is no half proton in the atom hence we can not have an atomic number of 110.5.
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If an object has a mass of 43.23 g and a volume of 32.1 mL, what is its density? Show your work!
Answer: 1.34 g/ml
Explanation: Density is an objectives mass divided by it's volume:
(43.23 g)/(32.1 ml) =1.34 g/ml
where do we get the mass number
Explanation:
Mass number is the sum of the numbers of protons and neutrons present in the nucleus of an atom.
Two skaters stand on ice. one weights 250 N, and the other weights 500 N. They push against each other and move in opposite directions. Describe the momentum of each skater after they push away from each other.
Answer:
Because law of momentum, makes it equal
English
M.
3.x - 9
2r-7
.X + 2
18
Answer:
it will come answer 21 write
What makes an atom radioactive?
Answer:
The unstable nucleus of radioactive atoms emit radiation.
Explanation:
When the atoms of an element have extra neutrons or protons it creates extra energy in the nucleus and causes the atom to become unbalanced and unstable, or radioactive.
(https://www.epa.gov/radtown/radtown-radioactive-atom-activity-4-atomic-stability)
Answer:
When the atoms of an element have extra neutrons or protons it creates extra energy in the nucleus and causes the atom to become unbalanced or unstable. Whether radioactive elements can become stable and if so, how. The unstable nucleus of radioactive atoms emit radiation. ... This process is called radioactive decay.
Explanation:
A 1-L soda bottle contains dissolved carbon dioxide gas. Which bottle would have the highest concentration of dissolved gas?
a bottle that is sealed
a bottle that was opened 1 minute ago
a bottle that was opened 1 hour ago
a bottle that was opened 1 day ago
Mark this and return
Answer:
A bottle that is sealed would have the highest concentration.
Explanation:
When you put a gas into a container, the concentration or the amount of mol inside the bottle would be highly concentrated. If you open the bottle, the CO2 would spread outwards and leave the bottle giving more room between each molecule. The longer you open the bottle, the less concentrated the gas will be.
white vitriol molecular formula
and green vitriol molecular formula??
Answer:
Green vitriol- FeSO4·7H2O
white vitriol- ZnSO₄
what are lower and higher energy levels.
Answer:
If an atom, ion, or molecule is at the lowest possible energy level, it and its electrons are said to be in the ground state. If it is at a higher energy level, it is said to be excited, or any electrons that have higher energy than the ground state are excited
Explanation:
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A compound contains only carbon, hydrogen, and oxygen. Combustion of 8.544 mg of the compound yields 12.81 mg CO2 and 3.50 mg H2O. The molar mass of the compound is 176.1 g/mol. What are the empirical and molecular formulas of the compound
Answer:
The empirical formula is the formula with a minimum whole number ratio of the constituent atoms present in a molecule. While the molecular formula has the actual number of atoms of various elements present in the molecule of the substance.
Empirical formula is C₃H₄O₃
Molecular formula is C₆H₈O₆
This question involves finding the empirical and molecular formulas. Empirical formula is the one where minimum whole number ratio of the constituent atoms present in a molecule is shown whereas molecular formula is the one that shows the number of each type of atom that are present in a molecule.The compound contains only carbon, oxygen and hydrogen and undergoes combustion. Thus;[tex]C_{x}[/tex][tex]H_{y} O_{z}[/tex] + O₂ ⟶ xCO₂ + [tex]\frac{y}{z} H_{2} O[/tex]
The combustion yields 12.81 mg of CO₂.From online sources, molar mass of CO₂ = 44 g/mol
number of moles of CO₂ = 12.81/44 = 0.291m mol
Mass of carbon in it is; C = 12 × 0.291 = 3.492 mg
Similarly the combustion yields 3.50 mg H2O.molar mass of water = 18 g/mol
number of moles of water in it = 3.5/18 = 0.194m mol
Hydrogen has 2 nos in water and so;
number of moles of hydrogen = 2 × 0.194 = 0.388m mol
Mass of hydrogen = 1 × 0.388 = 0.388 mg
Compound is 8.544 mg and so;Oxygen mass = 8.544 - (3.492 + 0.388) = 4.664 mg
Similarly, moles of oxygen that has molar mass of 16 is;
no of moles of oxygen = 4.664/16 = 0.2915m mol
Thus;Ratio of C:H:O is; 0.291:0.388;0.2915
Simplifying this gives us the empirical formula ratio as;
3:4:3
Thus;
Empirical formula is C₃H₄O₃
Molar mass of C₃H₄O₃ = (12 × 3) + (1 × 4) + (16 × 3) = 88 g/molWe are told that the molar mass of the compound is 176.1 g/mol.
Thus;
Molecular formula is; (176.1/88)C₃H₄O₃ = C₆H₈O₆
Read more at; brainly.com/question/14853529
Round each number to four significant figures
a. 84,791
b. 256.75
C. 431,801
d. 0.00078100
Answer:
a.
84,791 » 8479
b.
256.75 » 256.8
c.
431,801 » 4318
d.
0.00078100 » 0.0007810
Explanation:
[tex].[/tex]
Los elementos que forman aniones con carga -1 y una capa externa estable de ocho electrones pertenecen al grupo de los:
Los elementos que forman aniones con carga -1 y una capa externa estable de ocho electrones pertenecen al grupo de los: halógenos.
Para alcanzar la estabilidad, los átomos siguen la regla del octeto: ganan, pierden o comparten electrones para tener 8 electrones en su capa externa (capa de valencia).
Los elementos del Grupo 17 de la Tabla Periódica, conocidos como halógenos, tienen 7 electrones en su capa de valencia. Así, tienden a ganar 1 electrón para completar su octeto. Como los electrones tienen carga negativa, al ganar 1 electrón los aniones quedan con una carga de -1.
Puedes aprender mas sobre la regla del octeto aquí: https://brainly.com/question/18892451
cuantos gramos de soluto y solvente tendra 127 gramos de solición cuya concentración es 14% m/m ayuda para resolverlo
banetshegtsjegsgeheb
HELP IM TIMED!!!!!!!!!
Yellowstone National Park has an average of about 4500 bison living in it. The park covers 3472 square miles. What is the population density of bison living in Yellowstone? a. 1.3 bison/mi^2 b. 16 bison/mi^2 c. 77 bison/mi^2 d. 0.77 bison/mi^2
Answer:
A. 1.3 bison/mi^2
Explanation:
4500 bison divided by 3472 sq miles is 1.3 bison per mile squared.
there are 3 isotopes of the element Gz: Gz-80,Gz-81,Gz-83. the average atomic mass of Gz is 82.74. what is the most abundant isotope of Gz? (please type the mass number only )
The most abundant isotope is Gz-83 because the average atomic mass of Gz is closer to 83.
The average atomic mass is defined as the weigthed mean of the isotopes.
The mass of the isotopes is 80, 81 and 83 uma, respectively.
As the average atomic mass (82.74uma) is closer to the atomic mass of Gz-83 than the mass of the other isotopes, you can interpretate that the most abundant isotope is Gz-83.
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If zinc has an atomic number of 30 and a mass number of 65 what is the correct number of protons neutrons and electrons ?
Answer:
protons 30
neutrons 35
electrons 30
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What is the change of state in which a gas becomes a liquid?
Answer:
Condensation
Explanation:
Answer:
Condensation
Explanation:
When a gas changes to a liquid it is known as condensation. It happens when molecules in a gas slowly reduce their movement speed.
HOPE THIS HELPED
Help!! due tomorrow
.
Answer:
It's B. The molecules in the system have more kinetic energy than a solid.
!!DUE TODAY, NEED HELP ASAP!!
A student measured the masses of some aluminum and copper cylinders of different volumes. The data is displayed below:
Aluminum: Copper:
Volume (mL)
Mass (g)
Volume (mL)
Mass (g)
3.7
9.99
1.8
16.02
6
16.2
2.3
20.47
8.5
22.99
3.5
31.15
10.74
29
4.2
37.38
15
40.5
5.8
51.62
On graph paper graph the data above on ONE graph. Use the graph paper so the longer side is your y-axis.
Use up the majority of the graph paper. Do not make a small graph!
Use a ruler/straight edge so you graph is neat.
You will need to plot the points for each substance and create a double line graph. When connecting your points for each substance, continue the lines past the plotted points.
Be sure to include a key to identify the substances.
Make your X-axis volume(mL) and your Y-axis mass(g)
Look at the numbers for both substances when creating your scales. You will most likely have a different scale for mass and volume. What is the lowest number? What is the highest number? What does it make sense to go by?
Calculate the density of each metal.
Aluminum:_________________________ Copper:________________________
What happens to the mass of the copper at the volume increases from 6 to 8mL?
Which sample is more dense? How does the graph show you this?
Answer: The data are not arranged in a useful pattern. I arranged them as best I could and made a graph in Excel for demonstration.
Explanation: The data are plotted with mass on the x axis and volume on the y. Add a key to identify the top line as CU and the bottom as Al.
The density of Cu is 8.9 g/ml and 2.70 for Al.
The mass of copper increases by 17.8 grams going from 6 to 8 ml. (8.9 g/ml)*(2 ml) = 17.8 grams.
Copper is more dense. c The graph shows that for the same volumes, copper has the higher mass.
4.250 x 10-6 nm in standard form , please help!!
Answer: 4,250 x 10 - 6
Explanation: ok so we have a decimal number, what you do with that is
[tex]4.250 x 10^{3}[/tex] = 4.250 x 1,000 = 4,250 now you can just move the decimal every time without that equation but its better safe. I'm pretty sure that's how they want it, because its not expanded or word.
A sunscreen preparation contains 2.70 % by mass benzyl salicylate. If a tube contains 6.0 oz of sunscreen, how many kilograms of benzyl salicylate are needed to manufacture 340 tubes of sunscreen?
We know that the sunscreen preparation contains a 2.7% by mass of Benzyl Salicylate. From this, we will find that they need 1.559 kg of Benzyl Salicylate to make 340 tubes of sunscreen.
The initial data means that if the total mass of sunscreen is M, then the mass of Benzyl Salicylate will be 2.7% of M, or:
(2.7%/100%)*M = 0.027*M
Now, we know that a tube contains 6.0 oz of sunscreen.
Then M = 6.0oz
A tube contains:
0.027*6.0oz = 0.162 oz.
Then in 340 tubes, we will need 340 times 0.162 oz of Benzyl Salicylate, this is:
340* 0.162 oz = 55.08oz
And we want this quantity in kg.
Knowing that:
1oz = 0.028kg
Then 55.08oz is 55.08 times 0.028kg:
55.08*0.028kg = 1.559 kg
So they will need 1.559 kg of Benzyl Salicylate to make 340 tubes of sunscreen.
If you want to learn more, you can read:
https://brainly.com/question/24398363
Chewing food to break it down into smaller particles represents a physical change, but the charging of starch into sugars by enzymes in the digestive system represents a chemical change.Chemical or physical change?
Answer:
Chemical changeExplanation:
The charging of starch into sugars by enzymes in the digestive system shows a chemical change.[tex]\tt{ \green{P} \orange{s} \red{y} \blue{x} \pink{c} \purple{h} \green{i} e}[/tex]
if you are asked to help the laboratory assistant in separating the mixture which method will you see?
Answer:
use secondary data. the normal method to use
can any one tell me same for ALCL3 I need it urgently plzzz
Lets Form bonds
Al=2,8,3
Lets Write actual configuration or modern
[tex]\\ \sf\longmapsto 1s^22s^22p^63s^3[/tex]
It has valency +3Cl:-2,8,7Let's write configuration
[tex]\\ \sf\longmapsto 1s^22s^22p^63s^23p^5[/tex]
It has valency -1Now Criss cross valency (Refer to attachment)
We get
[tex]\\ \sf\longmapsto AlCl_3[/tex]
In your conversion from Milli- to Centi- units, would you move the decimal point to the left or the right?
Answer:
one unit to the left
Explanation:
cm are 10 times mm, so to convert you have to divide by ten
Examples
100 mm = 10,0 cm
0.50 mm = 0.05 cm
Element Z has 2 natural isotopes. One isotope has a mass of 15.0 amu and a relative abundance of 30%. The other isotope has a mass of 16.0 amu. What is the second isotope's relative abundance?
Answer:
70%
Explanation:
Just substract 100 % - 30%
THIS IS URGENT meant to be due today can someone help out please I’ll brainlist :)!
Hi,
These are the answers
•Question 6. B, Yogurt and sour milk
•Question 7. B, turn litmus paper red
•Question 8. B, used to find pH of a solution
•Question 9. A, names of products and reactants of a chemical reaction in words
•Question 10. B, feel slippery
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Density and Years: What do you know?Objectives: determine and compare density of pennies to assess composition. Procedure:1. Read the directions and create a data table accordingly.2. Place 15-20 pennies in order of consecutive dates. Find the mass of each penny and record.3. Find the volume of all 5 pennies by water displacement and record in your data table. Record the volume adding 5 more pennies at a time until you have measured them all (15-20).a. Find the average volume of 1 penny.4. Calculate the density of each penny and graph according to the year.5. If the density of copper is 8.96 g/cm3 what would the mass of a pure copper penny be?6. Draw a conclusion.7. How might this relate to a real world example?
Answer:I dunno
Explanation:it is the best thing I ever said in this app
which elements are liquid in the periodic table?
Help Please I need to finish TODAY
Answer:
A. > digestive and circulation
B. > digestive and excertory
C. > nervous and muscluar
D.> digestive and circulation
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