Which phase change requires more heat energy, Heat of fusion or Heat of
vaporization? Explain in terms of particle arrangements.
Answer:
heat of fusion
Explanation:
heat of fusion is melting which requires more heat energy than heat of vaporization
What is a mole in chemistry
Answer:Mole, also spelled mol, in chemistry, a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles.
Explanation:
how did rutherford contribute to atomic theory?
Explanation:
Rutherford’s laboratory showed that when alpha particles are fired into gas atoms, a few are violently deflected, which implies a dense, positively charged central region containing most of the atomic mass.
Explain how balancing chemical equations relates to the law of conservation of matter.
Answer:
Normally, it explains that matter cannot be created or destroyed. It demonstrates different chemical reactions that help show the different transformations of the matter but will never destroy it or create it.
Determine what elements are denoted by the following electron configurations:
1s22s22p63s23p4s23d104p65s1
Answer:
Electron Configurations - Solutions
Note: The electron configurations in this worksheet assume that lanthanum (La)
is the first element in the 4f block and that actinium (Ac) is the first element in the
5f block. If your periodic table doesn’t agree with this, your answers for elements
near the f-orbitals may be slightly different.
1) sodium 1s2
2s2
2p6
3s1
2) iron 1s2
2s2
2p6
3s2
3p6
4s2
3d6
3) bromine 1s2
2s2
2p6
3s2
3p6
4s2
3d104p5
4) barium 1s2
2s2
2p6
3s2
3p6
4s2
3d104p6
5s2
4d105p6
6s2
5) neptunium 1s2
2s2
2p6
3s2
3p6
4s2
3d104p6
5s2
4d105p6
6s2
4f145d106p6
7s2
5f5
6) cobalt [Ar] 4s2
3d7
7) silver [Kr] 5s2
4d9
8) tellurium [Kr] 5s2
4d105p4
9) radium [Rn] 7s2
10) lawrencium [Rn] 7s2
5f146d1
11) 1s2
2s2
2p6
3s2
3p4
sulfur
12) 1s2
2s2
2p6
3s2
3p6
4s2
3d104p6
5s1
rubidium
13) [Kr] 5s2
4d105p3
antimony
14) [Xe] 6s2
4f145d6
osmium
15) [Rn] 7s2
5f11 einsteinium
16) 1s2
2s2
2p6
3s2
3p6
4s2
4d104p5 not valid (take a look at “4d”)
17) 1s2
2s2
2p6
3s3
3d5
not valid (3p comes after 3s)
18) [Ra] 7s2
5f8
not valid (radium isn’t a noble gas)
19) [Kr] 5s2
4d105p5 valid
20) [Xe] not valid (an element can’t be its own electron configuration)
5. How many elements do we have in Octane?
5 elements
2 elements
20 elements
26 elements
Answer:
2 elements
Explanation:
Octane is composed of carbon and hydrogen atoms.
What is aluminum found in or used for? plz dont look it up
Answer:
Aluminum isn't found pure naturally, but its found mixed with other minerals in the earth. It's used to make cans, foil, kitchen utensils, window frames and even deodorant
Explanation:
identify the PowerHouse of a cell
A. Golgi
B. lysosome
C. ribosomes
D. nucleus
E. mitochondrion
F. cytoplasm
G. rough endoplasmic reticulun
H. membrane
Which descriptions apply to eukaryotic cells? Check all that apply.
are usually multicellular
contain a true nucleus
contain membrane-bound organelles
has DNA located in the cytoplasm
Answer:
The first 3
Explanation:
Eukaryotic cells are usually multicellular, contain a true nucleus, and contain membrane-bound organelles. Hence, options A, B and C are correct.
What are Eukaryotic cells?The eukaryotic cell has a nuclear membrane that surrounds the nucleus, in which the well-defined chromosomes (bodies containing the hereditary material) are located.
Eukaryotic cells are usually multicellular, contain a true nucleus, and contain membrane-bound organelles.
Hence, options A, B and C are correct.
Learn more about Eukaryotic cells here:
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the order of particle in all substance is the same
A True
B false
Answer:
false false false false
What elements are involved with fission
Answer:
Several heavy elements, such as uranium, thorium, and plutonium, undergo both spontaneous fission, a form of radioactive decay and induced fission, a form of nuclear reaction.
What would the total mass of a 4.9 mole sample of Barium (Ba) be if its Molar Mass is 137g?
O 132g
O 142g
O 671g
Answer:
m = 671 grams
Explanation:
Given that,
No of moles, n = 4.9
Molar mass of Barium, M = 137 g
Mass divided by molar mass is equal to no of moles. It can be given by the formula as follows :
[tex]n=\dfrac{m}{M}\\\\m=n\times M\\\\m=4.9\times 137\\\\m=671.3\ g[/tex]
or
m = 671 grams
So, the total mass of the sample of Barium is 671 grams.
Which best describes the data?
Answer:
The average?
Explanation:
elements Combine with atoms with F in the same ratio as atoms of Mg
Answer: Chemical symbols are used to represent atoms and elements. A compound consists of atoms of two or more elements combined in a small, whole-number ratio. Atoms of each of its elements are always present in the same ratio
Explanation:
Use the information below to explain why the atomic radius decreases across a period.
Answer:
Detail is given below.
Explanation:
Atomic radius trend along period:
As we move from left to right across the periodic table the number of valance electrons increases. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.
we can see in picture A there is one positive charge and force of attraction is 2.30×10⁻⁸ N
In picture D there are 2 positive charge and force of attraction is 4.60×10⁻⁸ N
So by increasing the positive charge force of attraction also increases.
In F we can see there is more positive charge thus force of attraction is also greater.
what is balance equation
Answer:
Balanced equations are those whose coefficients result in equal numbers of atoms for each element in the reactants and products.
1.In class, students learned that a cart will move when a force of 50 N or greater is applied. A student pushed on the cart with a force of 10 N. The cart did not move. Why not?
2. Student A pushed on the cart with a force of 500 N. Student B pushed on the other side of the cart. The cart did not move. How much force did student B apply? Explain how you know.
3. 3. Student A pushed on the cart with a force of 400 N. Student C pushed on the other side of the cart. The cart rolled to the left. Did student C apply more, less, or the same force as student A? Explain how you know.
Yo help me this is due in 15 mins
Please help brainiest is award!!!!!!!!!!!
Answer:
it doesnt even give you enough information for you to answer it
Explanation:
Answer:
it doesnt even give you enough information for you to answer it
Explanation:
Julie tears a piece of notebook paper. This is a(n) _____.
1. I am in group two period three. What element am I?
A Ti
B, C
C. Ca
D. WE
Answer:
Ca
Explanation:
Plants need to take in gases and release gases during their
everyday life processes. What part allows plants to do this?
Answer:
The Stomata
Explanation:
The Stomata is found in the leaves of plants and controls their gas exchange with the environment around them.
find the density of a brick that has a mass of 57 g and a volume of 12 ml
Answer:
4.75 or 4.8
Explanation:
density = mass / volume
57 / 12 = 4.75
from here you can leave it as is or round up.
hope this helps!!
Which thing has the greatest
mass and volume?
• a very large rock
• a big balloon
• a mud puddle
• a car
Answer:
either a car or a rock
Explanation:
because the rock can weigh more than the car , and vice-versa with the car weighing more than the rock
What is the volume of a 30.0 g sample of A which has a density of 8.00 g/cm3?
Answer:
V = 3.75 cm³
Explanation:
Density = Mass / Volume
Step 1: Define variables
D = 8.00 g/cm³
M = 30.0 g
V = unknown
Step 2: Substitute and Evaluate for V
8.00 g/cm³ = 30 g/ V
V = 15/4 cm³
V = 3.75 cm³
How are covalent molecules named?
A. A number is used in front of each element's name, and the first element is changed to end in -ide.
B. A prefix is added to each element's name, and the second element is changed to end in -ide.
C. A roman numeral is used to indicate the number of atoms of each element.
D. The name of each element is followed by a number to indicate the amount of atoms.
Answer:
A prefix
Explanation:
you're welcome
The covalent molecules named as,
A prefix is added to each element's name, and the second element is changed to end in -ideSo, option B is correct one.
What is covalent molecules?The molecule formed by sharing of electrons between atoms is called covalent molecules .The atoms which form covalent molecules must have similar or less electnegativity difference.Examples of covalent molecules are hydrogen molecule [tex]H_{2}[/tex] ,carbon dioxide, methane etcTo learn more about covalent molecules,
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help me its due soon thanks
Answer:
B
Explanation:
The gravity accelleration values are the same for both planets.
B: Mercury and Mars have the same gravitational force.
You can see at the chart, it shows
Gravity: Mercury Mars
3.7 m/s2 3.7 m/2
How many mL are in 7.3 dL?
Answer:
730 mL which is .73 L
Explanation:
Each of the jars was heated 90°C each jar was placed on the counter and allowed to cool
is this correct please help?
Answer:
[tex]\boxed {\tt Number \ and \ unit}[/tex]
Explanation:
The two requirements for a measurement are a number and a unit.
For example, here is a measurement:
38.6 cm
The number is 38.6 and the unit is cm, or centimeters.
Therefore, both number and unit are correct.
What is the difference between an element and a compound? Give an example of each.
please answer in a sentence.
Answer:
An element is a single atom by itself found on the periodic table. A compound is made when two or more elements chemically bond together. An example of an element is hydrogen. (H) An example of a compound is [tex]H_{2} O[/tex].
Explanation:
explained above
