Answer:
d
Explandation:
Answer:
A.
Explanation:
Because the first organism was bacteria and bacteria does not need oxygen to grow
A mechanical pencil has the density of 3 grams per cubic centimeter. The
volume of the pencil is 15.8 cubic centimeters. What is the mass of the
pencil?
Answer:
The answer is 47.4 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 15.8 cm³
density = 3 g/cm³
We have
mass = 3 × 15.8
We have the final answer as
47.4 gHope this helps you
Mia put one liter of a substance into a 5 liter container. After 5 minutes she checked and the substances had expanded to take up the entire container. What substance did she use?
Group of answer choices
liquid
ice cubes
solid
gas
Answer:
Solid
Explanation:
Solid matter is composed of tightly packed particles. A solid will retain its shape; the particles are not free to move around. ... It will take the shape of its container. Particles can move about within a liquid, but they are packed densely enough that volume is maintained.
Jason is designing a computer model that shows the structure of different molecules. His model uses spheres to represent the atoms and lines to represent bonds. His program calculates the correct angle of the bonds and allows the user to rotate the molecule to see it in three dimensions. Which change could Jason make to his program to make the model more like a real molecule?
Answer:
Explanation:
The computer model that is being described seems pretty accurate, the only change I would consider making would be a zoom in/out feature that allows the user to zoom-in in order to see the protons and electrons that make up the atoms which ultimately make up the molecule. Mainly since they are also a very important part of the molecules' structure and final composition and can be a vital piece of data, especially being able to visualize it.
An atom of tin has an atomic number of 50 and a mass number of 119. How many protons, electrons, and neutrons are found in one neutral atom of tin?
Answer:
50
Explanation:
atomic number is equivalent to it's protons, electrons and neutrons in a neutral atom
The atomic number is reminiscent of its protons, electrons, and neutrons during a neutral atom. When A particle of an atom contains 26 protons, 23 electrons, and also 56 neutrons.
Protons, Electrons, and NeutronsWhen Every atom of tin has 50 protons in its nucleus. And there'll be 50 electrons around a neutral atom of tin. the quantity of neutrons varies because there are different isotopes of tin. Tin is interesting in this it's the element with the best number of stable isotopes of all the weather within the table. it's 10 stable isotopes, and that they are tin-112 (62 neutrons), tin-114 (64 neutrons), tin-115 (65 neutrons), tin-116 (66 neutrons), tin-117, (67 neutrons), tin-118, (68 neutrons), tin-119, (69 neutrons), The tin-120 (70 neutrons), tin-122 (72 neutrons), and also tin-124 (74 neutrons). There are other isotopes of tin starting from tin-99 to tin-137, and also the neutron count in any one of them are often found by subtracting the number of tin (which is 50, or the number of protons within the nucleus), from the mass unit of the isotope. for example, if we have an interest in tin-121, it's 121 minus 50 or 71 neutrons in it.
Thus the solution is 50
Find out more information about Protons, Electrons, and Neutrons here:
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insertion is a type of mutation that? 1.)adds a base to the DNA sequence 2.) a change in every amino acid that follows the point of mutation 3.) a change in one or few nucleotides that occur at single point in the DNA 4.) involves the loss of all or part of a chromosome
Answer:what is it
Explanation:
A sample of phosphorus contains 1.38e24 atoms. How many moles of phosphorus is this?
2.3 grams
0.44 grams
2.3 moles
0.44 moles
Answer:
The answer is 2.3 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question
N = 1.38 × 10²⁴ atoms
So we have
[tex]n = \frac{1.38 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 2.29235880...[/tex]
We have the final answer as
2.3 molesHope this helps you
Answer:
2.3 moles
Explanation:
To find the number of moles in a substance given it's number of entities we use the formula where n is the number of moles N is the number of entities L is the Avogadro's constant which is 6.02 × 10²³ entities From the question N = 1.38 × 10²⁴ atoms So we have We have the final answer
2.3 moles
Which color of the spectrum has the highest frequency?
A. Violet
B. Blue
C. Orange
D. Red
E. Yellow
Answer:
violet
Explanation:
which was is made from more than one element?
O carbon dioxide
helium
Ooxygen
O nitrogen
Answer:
carbon dioxide
helium
Explanation:
Answer:
i think it is helium
Explanation:
predict the reactants or products in the following nuclear reactions:
Answer:
I will try to solve these problems
An unknown element has 2 naturally occurring isotopes. The first isotope has an atomic mass of 84.9117 and the second isotope has an atomic mass of 86.909. Their abundances are 72.2% and 27.8% respectively.
Answer Choices: 85.56 86.44 85.21 86.00
Answer:The other isotope, 65Cu, has an abundance of 30.91%. Calculate the average atomic mass of copper. 63Cu 0.6909 x 63= 43.5267 65Cu 0.3091 x 65= +20.0915
Explanation:Nov 17, 2015 — The average atomic mass of an element is determined by taking the weighted average of the atomic masses of its naturally occurring isotopes. Now, weighted average ... avg. atomic mass=∑i(isotopei×abundancei). The more ... of the element. In your case, you know that rubidium has two stable isotopes.
Explanation:
To find the average atomic mass of the element we must take a weighted average. Using the formula [tex]am = (m_{1} * abundance)[/tex] . Plug and chug gives us
[tex]am = (84.9117 * 0.722) + (86.909 * 0.278) = approx. 85.56g/mol[/tex]
The element has an average mass of 85.56 amu.
As wavelength decreases, frequency increases
A. True
B. False
Answer - True
Hope this helps :')
What is the primary reason why elements form compounds?
Answer:
To gain stability
Explanation:
If the outermost shell is not completely filled with electrons, the element has one of the three options: gaining electrons, losing electrons or sharing electrons. By gaining or losing electrons, ionic compounds are produced. Sharing of electrons results in the formation of covalent compounds.
convert 1234584 dimes to dollars
Which of the following is a change of state?
A. Chocolate melting when it is heated
B. Liquid water being absorbed by a dry sponge
O C. Wax becoming carbon dioxide and water when a candle burns
D. Bread dough rising when left out on a warm counter
SUES
Answer:
I think C. Hope this Helps!
Explanation:
Electronegativity is best described as
A.The measure of the ability for an atom to attract another atom's valence electrons
B.The energy required to remove an electron from an atom
C.The radius of an atom (from the center of the nucleus to the edge of the electron
cloud)
D.The energy required to add an electron to an atom
Which statement best describes the purpose of mitosis?
1.to repair damage to cellular structures
2.to replicate the cell's genetic material
3.to produce new proteins for cell growth
4.to produce energy for cellular function
Answer:
to replicate the cell's genetic material
Explanation:
i took the test
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2
Answer:
This is the electron configuration for Strontium.
Explanation:
There are 38 protons/electrons in this configuration, it matches Strontium, which also has 38 electrons.
PLEASE HELP ASAP!!!
True or False: A larger numerical value for electron affinity means it is more difficult for an electron to be added to an atom.
Answer:
i feel like it's false. i'm not quite sure, but i have a feeling that it's false. i hope i'm right.
Explanation:
1. Even though the iceberg and the water that surrounds it are made up of the same
substance, the iceberg is able to float. Why is this?
A. The volume of the iceberg equals the volume of an equal mass of water.
B. The mass of the iceberg is greater than the mass of an equal volume of water.
C. The volume of the iceberg is greater than the volume of an equal mass of water.
Answer:
i think C it's okay beacause of Density
Answer:
a
Explanation:
they weigh same ratio.
A) NaC2HO4 B) H2F2BLi C)2He2PSO4 D)3He2O4PH
Elements found in these formulas=
Plz help, its my last question.. or atleast help me understand it
Use a periodic table and match the element symbols in the formula to their name.
A kilogram weighs (at the earth's surface, e.g., the grocery store) approximately:
a. 5.5 pounds
b. 1.5 pound
c. 10 pounds
d. 2.2 pounds
Answer:
2.2 pounds
Explanation:
hope this helps :)
Which of these best defines climate?
a
Atmospheric condition at one place and time
b
Day-to-day condition of the atmosphere
c
Long-term condition of the atmosphere
d
Current atmospheric condition
Answer:
c
Explanation:
they usually say "climate change" like it's a big deal so it should be long term
A. Atmospheric condition at one place and time.
Explanation:I think the letter A is the one that best defines "climate"
hope this help!
Sorry if Im wrong
What is one of the oldest tricks in the chemist toolbox? Why did this become less and less useful?
Pls help me here, thanks in advance
Answer:
i think is
first is 2
second is 3
third is 2
fourth is 2
Answer:
which one do you want me to do there is four questions
In which process are simple materials chemically combined to form to more complex materials.
1. synthesis
2. digestion
3. homeostasis
4. diffusion
1. synthesis
because it is the only option which is a form of manufacturing complex materials
I will give Brainliest
When a hydrogen carbonate ion reacts with water, water acts as a Brønsted-Lowry base. Choose the reaction that describes this.
A. HCO3−(aq) + H2O(l) ⇌ H3O+(aq) + CO32−(aq)
B. H2CO3(aq) + H2O(l) ⇌ OH−(aq) + H3CO3+(aq)
C. HCO3−(aq) + H2O(l) ⇌ OH−(aq) + H2CO3(aq)
D. HCO3−(aq) + H3O+(aq) ⇌ H2O(l) + H2CO3(aq)
Answer:
The answer would be A to this question.
S + O2 → SO2
1.60 g of O2 is reacted in excess sulfur (S) according to the
above reaction. If the percent yield of the reaction is 95.0 %.
What is the actual yield of SO2?
Your answer should be rounded to three significant figures. Do not include units
In your answer.
Answer:3.04
Explanation:Found answer online take my word for it.
Sandra reacts 3.345 g of zinc with hydrochloric acid. She obtained 3.956 g of zinc chloride. Calculate the percent composition of chloride in zinc chloride.
Explanation:
One molecule of the antibiotic known as penicillin G has a mass of ... b) If you isolate 115 g of zinc chloride, what is the percent yield of the metal ... This drives off the volatile hydrochloric acid, but the.
As Sandra reacts to the 3.345 g of zinc with hydrochloride acid as HCL the obtained value is about 3.956 g of zinc and the chloride the calculated value is.
The composition of chloride and zinc chloride is formed when a halogen gains an electron and when the Hydrogen chloride is dissolved.one molecule of the antibiotics known the penicillin i.e G has a mass of 115 g of zinc chloride, what is the percent yield of the metal This drives the volatile HCL acid.Learn more about the Sandra.
brainly.com/question/19793109.
In science, a summary of observed behavior is referred to as a(n)
Answer:
Law
Explanation:
A law is a summary of observed (measurable) behavior, whereas a theory is an explanation of behavior. A law tells what happens; a theory (model) is our attempt to explain why it happens.
Why do you think the elements are arranged the way that they are?
copy and paste Explanation: the reason that elements are arranged the way they are is that it makes them easier to comprehend, find, and understand.
The chemical elements are arranged this way because: they are grouped based on their atomic number (number of protons), for easy identification and predicting their ability to bond with other elements.
A periodic table can be defined as an organized tabular array of all the chemical elements typically arranged in order of increasing atomic number or number of protons (in rows).
Basically, a periodic table comprises eighteen (18) columns and seven (7) rows.
Groups, which are the families of chemical elements are represented by the vertical rows on the periodic table
On the other hand, the periods of chemical elements are represented by the horizontal columns.
Generally, the chemical elements are arranged this way because they are grouped based on their atomic number (number of protons), for easy identification and predicting their ability to bond with other elements.
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