What are some goals for science class virtual learning
Answer:
It wouldn't let me post it for some reason. Its all in the picture.
Really hope it helps!!:)
1.
Archaeologists have discovered the legendary Golden Igloo of the Pribiloff Islands, a structure consisting of a
halfspherical shell with an inner diameter of 1.25 m and an out diameter of 1.45 m. What is the value of this antiquity,
given that gold currently sells for $1,263/ounce and has a density of 19.3 g/cm3? (Note that 1 ounce = 31.1034768 g)
Answer:
The value of the Golden Igloo is $227.4 million.
Explanation:
First, we need to find the inner and the outer volume of the half-spherical shell:
[tex] V_{i} = \frac{1}{2}*\frac{4}{3}\pi r_{i}^{3} [/tex]
[tex] V_{o} = \frac{1}{2}*\frac{4}{3}\pi r_{o}^{3} [/tex]
The total volume is given by:
[tex] V_{T} = V_{o} - V_{i} [/tex]
Where:
[tex] V_{i} [/tex]: is the inner volume
[tex]r_{i}[/tex]: is the inner radius = 1.25/2 = 0.625 m
[tex] V_{o} [/tex]: is the outer volume
[tex]r_{o}[/tex]: is the outer radius = 1.45/2 = 0.725 m
Then, the total volume of the Igloo is:
[tex] V_{T} = \frac{2}{3}\pi r_{o}^{3} - \frac{2}{3}\pi r_{i}^{3} = \frac{2}{3}\pi [(0.725 m)^{3} - (0.625 m)^{3}] = 0.29 m^{3} [/tex]
Now, by using the density we can find the mass of the Igloo:
[tex] m = 19.3 \frac{g}{cm^{3}}*0.29 m^{3}*\frac{(100 cm)^{3}}{1 m^{3}} = 5.60 \cdot 10^{6} g [/tex]
Finally, the value (V) of the antiquity is:
[tex] V = \frac{\$ 1263}{oz}*5.60 \cdot 10^{6} g*\frac{1 oz}{31.1034768 g} = \$ 227.4 \cdot 10^{6} [/tex]
Therefore, the value of the Golden Igloo is $227.4 million.
I hope it helps you!
CAN SOMEONE PLEASE HELP ME OUT WITH THESE 2 QUESTIONS? ILL GIVE YOU A GOOD RATING!!
តើកាបូនមានវ៉ាឡង់ប៉ុន្មាន
Answer:
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Explanation:
Science pls help me having trouble on the third one
Answer:
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Which is true of cell differentiation?
A. Tissues produce various stem cells.
B. Stem cells become different types of cells.
C. Unicellular organisms become multicellular
Answer:
B
Explanation:
When stem cells differentiate, they are different (almost like mutation).
Answer:
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20 points to anybody that can answer all 3 of these questions
Answer:
1. 2AgO2 --> 4 Ag + O2
2. Decomposition
3. 2NaBr + CaF2 --> 2NaF + CaBr2
Explanation:
what is the total number of moles of KCIO, needed to produce 6 mol of 02
Answer:
4 moles of potassium chlorate must be used to produce 6 moles of oxygen gas.
Explanation:
1.
what can noble gases be used for?
2.
what is a vertical column called in the periodic table
3.
what is the horizontal column in the periodic table
Answer:
1. They are mostly used to protect materials and prevent chemical reactions.
2.These are Groups
3. I guess it is Rows
will mark brainlest 1) Now that you have studied the facts about the Severn River, you are ready to make a decision. What questions would you want answered if you were to determine whether to build a tidal power plant at the Severn River?
Answer:
The questions I would like to answer are:
Will the productivity of the river severn offset the cost of installing the plant?
Is it possible to build a dam on site?
Is it possible to establish submerged turbines in this location?
How would human life and nature be impacted by the plant?
Explanation:
Tidal power plants are signals that use tidal energy to generate electricity. The installation of this type of plant is quite expensive and involves the establishment of dams on site to take advantage of the differences between high and low tides and the establishment of submerged turbines to take advantage of sea currents.
To decide whether I would decide to build a tidal plant on the Severn River, I would need to evaluate a few things to make sure that the project is viable. For that I would ask myself some questions like:
Will the productivity of the river severn offset the cost of installing the plant? (If the installation costs are greater than the capacity of this river to promote high generation of electricity, it would be better to abandon the project)
Is it possible to build a dam on site? Is it possible to establish submerged turbines in this location? (It is necessary to consider the physical and chemical characteristics of the place to know if it is possible to install these two equipment and in a way that they work efficiently)
How would human life and nature be impacted by the plant? (Projects like this include major environmental and social impacts. These impacts must be analyzed and ways to mitigate them must be considered and included in the project.)
can someone help me please
Answer:
it's d
Explanation:
I took the test and got it right
22. A student carefully measures a certain quantity of four different substances
into trays that will be used in a laboratory exercise. Which of these trays would
contain the largest number of atoms?
Sample
Mass of tray
with sample
Water
Mass of
empty tray
37.86g
36.59g
37.418
55.88g
Table Salt (NaCl)
Copper Wire
95.03g
100.96g
245.20g
Lead Shot
38.08g
Answer:
Water
Explanation:
The substance that has the highest number of moles also has the highest number of atoms.
The number of atoms of a substance can be calculated using the Avogadro's number. This number gives the number of elementary entities such as atoms, molecules and ions in one mole of a substance.
All you need to do is to find out which substance has the highest number of moles. This substance will also have the highest number of atoms present.
Learn more about Avogadro's number: https://brainly.com/question/1445383
calculate the amount of magnesium that will react with 16.0 g of oxygen to produce 40.5 g of magnesium oxide.
Answer:
24.3g
Explanation:
Mr of Oxygen = 16 (15.999)
Mr of Magnesium = 24.3 (24.305)
Mass / Mr = moles
16.0g / 16 = 1
Mr x moles = Mass
24.3 x 1 = 24.3g
collect some of chalk, limestone, marble, eggshells and seashells and mix them with a dilute acid. pass the gas produced into a small amount of limewater to test for carbon dioxide. is carbon dioxide gas produced in each case.
Explanation:
Yes carbon dioxide found in each case
what’s the difference between 2o and o(subscript 2)?
Answer:
2O is an atom while O2 Is a molecule
Name:
1. The nucleus is the part of the atom that
A consist mostly of empty space
B.
has a negative charge
Coccupies most of the atom's total volume
D. contains most of the atom's total mass
Answer:
D.
Explanation:
There are three types of particles within atoms: protons, neutrons, and electrons.
Electrons have essentially no mass and orbit the nucleus in various energy levels.
Protons and neutrons have mass and are both found within the nucleus of the atom.
What is the main process by which water moves from land to the atmosphere?
Answer:
isn't that evaporation if not you can just delete my answer-
Explanation:
Select the correct answer.
Beryllium (Be) and fluorine (F) combine to make the compound BeF2. What is the chemical name for this compound?
A.
beryllium fluoride
B.
beryllium fluorine
C.
beryllide fluoride
D.
beryllide fluorine
Answer:
A number is right I think
Answer:
A.
beryllium fluoride
I hope it is helpful...
which of the following correctly represents the radioactive decay of cesium-137?
What is the man’s weight on Mars where the acceleration due to gravity is 3.7 m/s2?
Answer:
6.39 × 10^23 kg (0.107 M⊕)
Explanation:
What Reactants are needed for photosynthesis?
Glucose and Oxygen
Carbon Dioxide and Water
Water and Oxygen
Carbon Dioxide and Oxygen
Answer:
Carbon dioxide and water.
Explanation:
If there isn't carbon dioxide, photosynthesis wouldn't happen as carbon dioxide is needed to transfer into the plant and after that the oxygen travels into the surroundings from the plant. There isn't any water, the plant wouldn't be able to make food called glucose.
please help quick the 6th question is “What is a catalyst?” (include all three parts)
I really need help I'm not good with science
Answer:
A!!!!!!!!
Explanation:
How many molecules are in 83.2 g of chlorine gas (C12)?
Answer:
3.2
Explanation:
dont trust me
Which energy source can be renewed in less than a week?
a ton of coal
a barrel of oil
the charge on a solar battery cell
the ethanol produced by an acre of corn
Answer:
a charge on a solar battery cell
what happens to iron if it's left in
moisture for few days?
Answer:
The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust.
Explanation:
this is what will happen in water
I really need help on this question! Thank you so much!
Answer:
A. Empirical formula => C₂H₄O
B. Molecular formula => C₄H₈O₂
Explanation:
From the question given above, the following data were obtained:
Mass of C = 0.273 g
Mass of H = 0.046 g
Mass of O = 0.182 g
Molar mass of compound = 88 g/mol
A. Determination of the empirical formula of the compound.
C = 0.273 g
H = 0.046 g
O = 0.182 g
Divide by their molar mass
C = 0.273 /12 = 0.023
H = 0.046 /1 = 0.046
O = 0.182 /16 = 0.011
Divide by the smallest
C = 0.023 / 0.011 = 2
H = 0.046 / 0.011 = 4
O = 0.011 / 0.011 = 1
Thus, the empirical formula of the compound is C₂H₄O
B. Determination of the molecular formula of the compound.
Empirical formula = C₂H₄O
Molar mass of compound = 88 g/mol
Molecular formula =?
Molecular formula = [C₂H₄O]ₙ
[C₂H₄O]ₙ = 88
[(12×2) + (4×1) + 16]n = 88
[24 + 4 + 16]n = 88
44n = 88
Divide both side by 44
n = 88 / 44
n = 2
Molecular formula = [C₂H₄O]ₙ
Molecular formula = [C₂H₄O]₂
Molecular formula = C₄H₈O₂
8
This wasp was viewed under a microscope with a 40x objective lens and a 10x
eyepiece lens.
What was the total magnification
help its for my assessment
25 points
Answer:
400x
Explanation:
magnification=magnification of objective lens*magnification of eyepiece lens
m=40*10
m=400x
1. Which type of matter has the molecules packed closer together?
a. Solid
b. Liquid
c. Gas
d. Plasma
2. Matter is made up of __________.
a. Molecules
b. Particles
c. Atom
d. All of them
3. Particles with more energy move ________ than particles with less
energy.
a. Slower and closer together
b. Slower and farther apart
c. Faster and farther apart
d. Faster and closer together
4. Which best describes the particles in a liquid?
a. More freely moving than a gas
b. More freely moving than a
solid
c. Less freely moving than a
solid
d. Completely unmoving
5. Which of the following statements describes a mass?
a. The force of attraction between two bodies.
b. The force of gravity exerts on a body of mass.
c. The amount of matter in an object.
d. The weight of the object from place to place.
Answer:
1. Solid
2. atom
3. faster and farther apart
4.more freely moving than a solid
5.The amount of matte in an object
Explanation:
Answer:
1. Solid
2. Atom
3. Faster and farther apart
4. More freely moving than a solid
5. The amount of matter in an object.
What is it about the structure of magnesium atoms that makes them react more slowly than sodium atoms?
Answer:
A reactive metal has the ability to easily lose an electron and acquire a positive charge. Sodium easily loses electrons and acquires a positive charge. Sodium easily lose electrons than magnesium and get oxidized to easily.
Explanation:
