Is poverty a cycle? And how?
Atoms can be combined in simple, whole number ratios
How many significant figures in the following number:0.09050m
Answer:
There are 4 significant figures.
Explanation:
Any zeros that come before any non-zero number are never significant.Zeros that are in between any non-zero numbers are always significant.Zeros that come after any non-zero are ONLY significant is there is a decimal point present. (In this case, there is.)The significant figures are underlined :
0 . 0 9 0 5 0
An unknown element, X, is isolated and examined. It is determined that 91.0% of the sample is composed of the isotope 75X while the other 9.00% of the sample is composed of 77X. Based on this information, what is the atomic mass of element X?
Answer:
Natural abundance of X is 75.18amu.
Explanation:
The atomic mass of an element is defined as the mass of its isotopes times its natural abundance.
In the unknown element X, the atomic mass of the isotope ⁷⁵X is 75 amu and of ⁷⁷X is 77 amu.
That means the natural abundance of X is:
75amu*91.0% + 77amu*9.00%
Natural abundance of X is 75.18amuA rectangular box has a length of 12 cm, a width of 20 cm, and
a height of 5 cm. What is the volume of the box in ml?
a 1200 mL
b 160 mL
C 300 mL
d 37 mL
Answer: a. 1,200 mL
Explanation:
20 x 12 x 5 = 1,200
(L x W x H)
Explain how the different layers of the mantle have a different state of matter. (Why is
one solid and one liquid?)
Answer:
the crust is solid because the particles are tightly packed and moves very little. the mantle is a liquid because the particles are more spread apart and have more movement.
Explanation:
i already explained it :)
An aluminum bar was found to have a mass of 27g. Using water displacement, the volume was measured to be 10 ml. What is the density of the aluminum? Group of answer choices (27 g)/(10 ml) (10 ml )/(2.70 g) (270 g)/(10 ml) (10 ml )/(27 g)
Answer:
2.7 g/mL:)
An aluminum bar was found to have a mass of 27g. Using water displacement, the volume was measured to be 10 ml. What is the density of the aluminum? Group of answer choices (27 g)/(10 ml) (10 ml )/(2.70 g) (270 g)/(10 ml) (10 ml )/(27 g)
Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore, the density of the aluminum bar is 2,700 g/L or 2.7 g/mL.
What is density?Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.
Mathematically,
Density of aluminum bar = Mass of aluminum bar ÷volume marked on the graduated cylinder
Mass of aluminum bar= 27g
volume of aluminum bar= 10 ml=0.01L
substituting all the given values in the above equation, we get
density= 27g /0.01L
On calculations, we get
density= 2,700 g/L or 2.7 g/mL
Therefore, the density of the aluminum bar is 2,700 g/L or 2.7 g/mL.
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Can you please help solving the attached question on isotopes especially part e and f?
Answer: all
Explanation:all
Is solid less dense than liquid?
Answer:
yes
Explanation:
Describe the purpose of a scientific investigation.
How many mg are in 9.02g ?
What variable is know as the data that you are collecting
Answer:
Data is a specific measurement of a variable – it is the value you record in your data sheet.
Explanation:
i dont know if that helps but i hope it does :)
Variables that are known as data while data collection are quantitative variables.
What are variables ?
A variable is any characteristics, number or quantity that can be measured or counted.It is called a variable because the value may vary and can change over a period of time as well.
There are different types of variables based on the ways they can be studied and presented.
Numeric variables have values describing measurable quantities. They are further classified as continuous or discrete.Continuous variable ranges between any set of real numbers.
Discrete variables is a numeric variable whose observation can take a value from a set of distinct whole values.
Ordinal variable is a categorical variable whose value can be logically ranked,whereas a nominal variable is a categorical variable whose observation can take up a value which is not being able to be put up in a logical sequence.
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Someone who studies the stars and planets would be working in which
branch of science?
A. Earth science
B. Marine science
C. Life science
D. Physical science
Answer:
Earth Science?
Explanation:
its not marine science or life so its physical or earth
1. Calculate the mass (g), of 4.5 atoms of oxygen.
I
Answer
thus, 4 moles of oxygen gas (O2) would have a mass of 128 g.
Do Positive ions Tend to be metals or no metals
Compounds can be broken down into simpler substances by chemical means, but elements can:_________.
Answer:
Compounds can be broken down into simpler substances by chemical means, but element can't broken down
Explanation:
giving brainliest to whoever answers, correctly.
Cecilia finds this cell under the microscope: there was supposed to be a picture How does she know it is an animal cell? It does not have a cell wall. It has a cell membrane. It has a nucleus. It is round.
Answer:
Small vacuoles
Explanation:
A plant cell contains a large, singular vacuole that is used for storage and maintaining the shape of the cell. In contrast, animal cells have many, smaller vacuoles. Plant cells have a cell wall, as well as a cell membrane. In plants, the cell wall surrounds the cell membrane.
What’s the H O H a compound, element, or mixture?
A cube has a mass of 456 g and a volume of 13 c. What is the density?
Answer:
Explanation:
456 convert to kg= 0.456
don;t know what units you have for volume but
density= mass/volume
0.456/13=0.035kg/cm3
one natural source of carbon dioxide.
Answer: decomposing biomass
The only beverage allowed during lab is water. True or false
Answer:
true (in some labs you aren't allowed to have any drinks so i dont know if that applies to your lab or not )
Explanation:
How many electrons are in the 4s sublevel for Bismuth
1. How is mass number, Atomic number, number of neutron, proton and electron related? 2.List down the applications of isotopes.
Answer:
The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus
The application of isotpes are:
Radioactive isotopes have many useful applications. In medicine, for example, cobalt-60 is extensively employed as a radiation source to arrest the development of cancer. Other radioactive isotopes are used as tracers for diagnostic purposes as well as in research on metabolic processes.
Identify from the following list which examples are
controlled experiments.
You make two pitchers of lemonade and
only change the amount of lemonade mix you
add.
only change the amount of water you add.
change both the amount of water and the
amount of lemonade.
DONE
Answer:
only change the amount of lemonade mix you add.
only change the amount of water you add.
Explanation:
just did this question
The examples of controlled experiments are as follows:
only change the amount of lemonade you add.only change the amount of water you add.Thus, the correct options for this question are B and C.
What is a Controlled experiment?A Controlled experiment may be defined as a type of experiment in which all the variable factors in an experimental group and a juxtaposition control group are held identical except for one variable factor in the experimental group that is significantly altered.
According to this question, the options in which one variable factor is altered should keep in the category of a controlled experiment. It is very easily identified that the alteration or addition of lamonade in one experiment or the only addition of water in another experiment.
Therefore, the correct options for this question are B and C.
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Which atomic model states that it is impossible to know the exact location of electrons around the nucleus?
Bohr model
Dalton model
plum pudding model
electron-cloud model
Answer:
d
Explanation:
edge 21
The different atomic theory was given by Bohr, Dalton, Thomson, and Rutherford. The electron-cloud model stated that it is impossible to know the precise position of electrons. Thus, option D is correct.
What is the electron-cloud model?The electron-cloud model is the modern atomic model that states the orbitals around the nucleus to the fuzzy clouds that are positioned in the atom. The probability of the electron depends on the denser areas.
This new model of atom focuses that the exact position of an electron cannot be determined rather its probable region can be determined. It was proposed by Erwin Schrodinger that falsified the electron to revolve in orbitals.
Therefore, Erwin Schrodinger's electron-cloud model states the position of an electron.
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What is the density of a sample of vinegar if it was found that 35.6 cm3 of vinegar has a mass of 39.4g?
Answer:
The answer is
1.11 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass of ethanol = 39.4 g
volume = 35.6 cm³
It's density is
[tex]density = \frac{39 .4}{35.6} \\ = 1.10674157...[/tex]
We have the final answer as
1.11 g/cm³Hope this helps you
Answer:
1.1g/cm³
Explanation:
The formula is [ d = m/v ] where m = mass and v = volume.
d = 39.4/35.6
d ≈ 1.1
Best of Luck!
All substances can be put in the trash for disposal. True or false
Answer:
False . Not all substances can be put in the trash for disposable
Explanation:
The diagram shows the direction of oxygen transfer from red blood cells to body cells.
What process does the arrow show?
body cells
capillary wall
©
red blood cell
A
B
с
D
Active transport
Diffusion
Osmosis
Transpiration
(1)
Your answer
Answer:
The diagr displays the "DIFFUSION" of oxygen from the red blood cells into the capillary to the body cells
The diagram showing the direction of oxygen transfer from red blood cells to body cells describes the process of diffusion.
Particles travel by a process called diffusion from a region of higher concentration to one of lower concentration. When it comes to oxygen transfer in the body, oxygen molecules flow through cell membranes from red blood cells, where their concentration is higher, into body cells, where it is less concentrated.
Active transport refers to the movement of particles against their concentration gradient, requiring energy input. Osmosis is the diffusion of water molecules across a selectively permeable membrane. Transpiration is the process of water movement through plants. These processes are not directly related to the transfer of oxygen from red blood cells to body cells.
Therefore, the correct option is diffusion.
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Convert .059 Hm into cm.
Answer:
One Hectometer is 10,000 centimeters. So multiply your hectometer by 10,000, and that's your conversion. Your answer is 590.
