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
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 75.18amuWhat does population density indicate? ______
Answer:
number of individuals
Explanation:
calculated by dividing the number of people by area
Answer:
It indicates the ammount of individuals per unit square area
Explanation:
If you have 500 people in a 500 squared miles the population density would be 1 person every one squared mile.
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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Hey guy I have presentation tomorrow on sodium . Can u give me ideas how to present it. So that students feel joy and easily understand
Answer:
first you could say did you know that you 3% of sodium in sprit but the good thing is that sodium wont make you gain any pounds if it weren't for sodium all are food wouldn't be preserved we would be eating unpreserved food witch could really hurt your body.
Explanation:
hope it helps
At most, how many covalent bonds can a phosphorous atom form?
(A) 1
(B2
(C)3
(D)4
Answer:
(c)
Explanation:
in both black and red
Answer:
I think 3 im am not sure
Explanation:
A molecule of ethanol has two carbon atoms, six hydrogen atoms, and one oxygen atom. A ball-and-stick model of a molecule of ethanol is made from the following components: one red ball two black balls six white balls eight sticks What do the black balls in the model represent? (1 point) oxygen atoms carbon atoms bonds between atoms hydrogen atoms
what are the answers
Explanation:
got this and dont know what it is
The correct answer is- The black balls represent carbon atoms.
Molecular models are three dimensional representations of a a molecule that enables us to visualize the molecule.
Molecules are represented by three dimensional models. These models help us to really have a firm grasp of what the molecule should look like.
In this particular question, we are told that ethanol has two carbon atoms, six hydrogen atoms, and one oxygen atom.
Also, we have; one red ball two black balls six white balls eight sticks What do the black balls in the model.
This implies that the two black balls must represent carbon atoms from the information provided.
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Can you please help solving the attached question on isotopes especially part e and f?
Answer: all
Explanation:all
list the visble colors short to longest wavelengths in the electromagnetic spectrum
Answer:
Explanation:
ROYGBIV
Red=>Orange=>Yellow=>Green=>Blue=>Indigo=>Violet rays
How many seconds are there in 3 hours and 40 minutes.
a
10,800 seconds
b 11,000 seconds
С
12,200 seconds
d 13,200 seconds
Answer:
i believe it should be b, 11,000 seconds
Explanation:
Answer:
D: 13,200
Explanation:
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.
Is solid less dense than liquid?
Answer:
yes
Explanation:
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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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:
Why We Write Chlorine As Cl2 Not As Cl
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 :)
A student bought a statue made up of copper. after a couple of months it acquired a dull green coating, explain the reason with a formula
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
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.
A 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)
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!
Need a little help with chemistry :)
*if you don’t know, don’t answer*
Answer:
1.33 moles
Explanation:
Answer:
8.00 x 10^23 / 6.02 x 10^23
Explanation:
sorry dont have my calculator but if you put it in you will get the answer
Name 3 substances that are solids at room temperature. Do the same for liquids and gases.
Answer and Explanation:
Solids:
We can name some chemical elements that in nature are solids at room temperature:
Aluminium (Al): it is a dultile metal with a color between silver and white.
Sulfur (S₈): it is a pale yellow solid.
Zinc (Zn): it is a metallic brittle solid.
Liquids:
Some substances that are liquids at room temperature are:
Water (H₂O): it is a subtance composed by 2 atoms of hydrogen and 1 atom of oxygen. It is a clear, limpid, odorless liquid.
Bromine (Br₂): it is a homogenoeus halogen which is liquid at room temperature. It has a color beteween red and brown.
Mercury (Hg): this heavy metal is liquid at room temperature.
Gases:
Hydrogen (H₂): it is a colorless, odorless and hightly inflammable gas.
Oxygen (O₂): a diatomic gas, without odor neither color, with an important role in biological proceesses.
Nitrogen (N₂): other diatomic gas, which is inert (it does not react easily).
A substance may exist as solid, liquid or gas at room temperature.
There are three states of matter;
SolidLiquidGasThe particular state of matter in which a substance exists at room temperature depends on the magnitude of intermolecular interaction between the molecules of the substance.
The following are gases at room temperature;
OxygenNitrogencarbon dioxideThe following are liquids at room temperature;
Waterhydrochloric acidsulfuric acidThe following are solids at room temperature;
Iodinecalcium carbonatesilver sulfideLearn more: https://brainly.com/question/12108425
Describe the purpose of a scientific investigation.
one natural source of carbon dioxide.
Answer: decomposing biomass
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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If the volume of water is 8.0 ml and it changes to 10 ml when aluminum is added, what is the volume of the aluminum?
Answer:
2 mL.
Explanation:
From the question given above, the following data were obtained:
Volume of water = 8 mL
Volume of water + Aluminium = 10 mL
Volume of Aluminium =?
The volume of aluminium can be obtained by calculating the difference between the volume of the water + aluminium and the volume of water. This is illustrated below:
Volume of aluminium = (Volume of water + Aluminium) – (volume of water)
Volume of water = 8 mL
Volume of water + Aluminium = 10 mL
Volume of Aluminium = 10 – 8
Volume of Aluminium = 2 mL
Therefore, the volume of aluminium is 2 mL.
3) (4.5 x 10-14) x (5.2 x 103) = ?
Answer:
16603.6
or
1.66036 x 10^4
Hope this helps! ^_^
Answer:
16,603.6
Explanation:
(4.5 x 10 - 14) x (5.2 x 103)
(45 -14) x 535.6
31 x 535.6
16,603.6
How many moles are in 5.3 X 10^6 atoms of Calcium (Ca)?
Answer:
8.801×10^-18 moles Ca
Explanation:
5.3 X 10^6atoms* (1mol/6.022*10^23) = 8.801×10^-18 moles Ca
