What is the highest level of organization for living and nonliving things?
Community
Ecosystem
Family
Population
✨And give a explanation ✨
The direct transfer of energy by electromagnetic waves is called __.
I really need help!!! I will give more points to people that actually help!
Name the molars in the unbalanced equation: C_8H_18+O_2=CO_2+H_2O
Then Name the molars in the balanced equation: 2C_8H_18+25O_2=16CO_2+18H_2O
Next list the order of the elements that you balanced the equation with
Answer:
C8H18 2 114.22852
O2 25 31.9988
CO2 16 44.0095
H2O 18 18.01528
Explanation:
state the Constituents of the following alloys:magnalium and bronze
Landscapes all over the world change due to:
1) Wind
2) Erosion
3) Water
Answer:
Erosion
Explanation:
Wind and water change landscapes by erosion.
Western regions Facts
How does polarity of water lead to cohesion and surface tension?
Answer: The polarity of water molecules means that molecules of water will stick to each other. This is called hydrogen bonding. Polarity makes water a good solvent, gives it the ability to stick to itself cohesion, stick to other substances adhesion, and have surface tension due to hydrogen bonding.
Explanation:
How many moles of gas would occupy 22.4 L at 273K in one arm?
Answer:
1 mol
Explanation:
Using the general gas law equation as follows:
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant (0.0821 Latm/molK)
T = temperature (K)
According to the provided information in the question;
V = 22.4L
T = 273K
P = 1 atm
R = 0.0821 Latm/molK
n = ?
Using PV = nRT
n = PV/RT
n = (1 × 22.4) ÷ (0.0821 × 273)
n = 22.4 ÷ 22.4
n = 1mol
If I have 38g of MgCl2, how many moles do I have?
Answer:
0.3991
Explanation:
no. of moles = mass/molar mass.so lets get the molar mass of MgCl2
(Mg=24.305 and Cl=35.453) so the molar mass of MgCl2= 24.305+(2*35.453)
molar mass of MgCl2= 95.211
now lets get the no of moles:no of moles=38g/95.211=0.3991
will gravitational force change based on a change of mass or a change of distance between objects
Answer:
The size of the gravitational force is proportional to the masses of the objects and weakens as the distance between them increases.
Write the systematic names of the following
I think it's aluminium chloride
The mass numbers for the elements in the periodic table.............as the atomic numbers.................. *
a. increase; decrease
b. increase; increase
c. decrease; decrease
d. decrease; increase
Answer:
d
Explanation:
Question 2 (2 points) Which of the following is true about finding the molar mass of potassium sulfate, K2SO4?
The molar mass is found by adding the molar mass of K, to the molar mass of sulfate.
The molar mass is found by taking 2 x the molar mass of K, plus 1 x the molar mass of sulfur, plus 4 x the molar mass of oxygen
The molar mass is found by using Avogadro's number divided by 22.4.
The molar mass of potassium sulfate is a number between 1 and 10.
Answer:
the answer is the 2 nd one ok
Answer:
Did you find the answer for this?
Explanation:
I am doing the test right now
How many grams of NaCl is needed to make 750mL of a 2.4 M NaCl solution?
Answer:
Molarity of the solution = 3.000 M
Volume of the solution = 250.0 mL = 0.25 L
moles in 250.0 mL = molarity x volume of the solution
= 3.000 M x 0.25 L
= 0.75 mol
Hence, 0.75 mol of NaCl is needed to prepare 250.0 mL of 3.000 M NaCl solution.
Moles (mol) = mass (g) / molar mass (g/mol)
Moles of NaCl in 250.0 mL = 0.75 mol
Molar mass of NaCl = 58.44 g/mol
Mass of NaCl in 250.0 mL = Moles x Molar mass
= 0.75 mol x 58.44 g/mol
= 43.83 g
Hence, 43.83 g of NaCl is needed to prepare 250.0 mL of 3.000 M solution.
Explanation:
What causes lava to not instantly melt ice sheets when it is poured onto it?
Answer:
Dry ice
Explanation:
Answer:
The lava doesn't melt through ice because the steam ice sits on top of a blanket of steam rather than on top of the ice itself. This means the friction between the lava and the ice is very low.
Explanation:
molar volume problems
13. An organic compound is found to contain 77.42% of C, 7.53% of H and
nitrogen. The mass of 1.12L of its vapour at NTP is 4.65g. Determine
the
empirical and molecular formula of the compound.
Answer
7.53% 97% if you divide it you can get the answer
Explanation:
What’s an example of phase change you’ve seen in real life?
Answer:
Melting and boiling will be seen in this example. Condensation might be seen as well. In the Phases of Water Gizmo™, you can heat up or cool down a container of water.
Explanation:
Which of the following are held together by nonpolar covalent bonds?
How many copies of DNA do haploid cells have
Answer:
2 lol
Explanation:
What is a solar eclipse? *
When the Moon is completely dark
When part of the Earth is completely dark
When the sun explodes
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As a scuba diving air tank is filled with air, the air is compressed in the tank to as much as 3000 psi of pressure. When filling the tank, it is observed that the tank becomes warmer.
Which argument BEST explains why this occurs?
A
When air is compressed, it turns solid. A short time later, the air evaporates back into a gas which releases heat.
B
When air is compressed, the molecules line up into a crystalline structure. As the molecules line up, they release energy in the form of heat.
C
When air is put into the tank, it expands rapidly, thereby raising the temperature.
D
Air molecules are free to move and as more air is added to the tank, the molecules move and collide faster which raises the temperature.
Answer:
The gas under pressure subjected to heat can cause the tank to explode. A scuba tank filled to capacity with compressed air at 3000 psi could just as easily go up to 3400-3500 psi if heated
Explanation:
Air molecules are free to move and as more air is added to the tank, the molecules move and collide faster which raises the temperature. Hence option D is correct.
What is pressure?Pressure is defined as the force applied perpendicularly to an object's surface divided by the surface area over which it is applied. The movement of the molecules and the collisions they have with one another and the vessel walls cause the pressure to build up. According to general relativity theory, pressure contributes to the mass-energy cause of gravity by making a gravitational field stronger.
The tank may blow up if the gas within was under pressure and exposed to heat. If heated, the pressure of a scuba tank filled to capacity with compressed air at 3000 psi may readily increase to 3400-3500 psi. Because air molecules are free to move, the temperature in the tank rises as more air is introduced, as the molecules move and collide more quickly.
Thus, air molecules are free to move and as more air is added to the tank, the molecules move and collide faster which raises the temperature. Hence option D is correct.
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Saturated molecules of this nutrient, which may predispose humans to cardiovascular disease, are solid at room temperature.
Which of the following describes wind direction?
Wind direction is reported by the direction from which it originates. For example, a north or northerly wind blows from the north to the south. Wind direction is usually reported in cardinal (or compass) direction, or in degrees.
Chris' yard has a light brown soil that is very fine. Chris has a hard time finding any rocks, including pebbles, in his yard. Reese's yard has a gray soil that is full of small and medium size rocks. If it rained on both of Chris' and Reese's yards, which yard would likely hold the water above ground the longest? A. Both yards would absorb the water at the same rate. B. Reese's yard C. Chris' yard D. Neither yard would absorb any water.
Answer:
B. Reese's yard
Explanation:
Because Reese's yard is full of rocks, rock's don't absorb water, while Chris' yard is only soil, which will make his yard absorb water quicker.
a b c or d ..........
Answer:
B
Explanation:
Radiation from ultraviolet rays can cause vision problems and sunburn.
If you have 0.045 L of 0.465 M potassium bromide. How many moles of potassium bromide are present?
A.)0.0209 mol
B.)0.02 mol
C.)0.021 mol
D.)20.9 mol
The number of moles of solute in a solution is the product of the molarity and volume of the solution. The number of moles in 0.045 L of 0.465 M potassium bromide is 0.0209 mol. Hence, option A is correct.
What is molarity ?Molarity of a solution is the ratio of its number of moles of solute to the volume of solution in liters. Molarity is the most common term used to express the concentration of a solution.
Molarity is a colligative property thus depends on the amount of substance and it is temperature dependant.
molarity = no.of moles/ volume in L
Given that volume of the potassium bromide solution = 0.045 L
molarity = 0.465 M
then, number of moles of potassium bromide solute = molarity × volume
no.of moles = 0.465 M × 0.045 L = 0.0209 mol.
Therefore, there are 0.0209 moles of potassium bromide is present in the solution.
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How much pressure does an elephant with a mass of 2200 Kg and a total footprint area of 4500 cm2 exert on the ground?
Answer:
47911.1 pa
Explanation:
The SI base unit of pressure is pascal, which is N/m^2.
2200 kg is 2200*9.8=21560 N, and 4500 cm^2=4500/10000=0.45 m^2.
So the total pressure exerted on the ground (!!) is 21560/0.45= 47911.1 Pa.
An object was measured by a worker as 35.6 cm long, however, the manufacturer specifications list the length of the object at 35.0 cm. What is the percent error in the workers measurement?
5.
Primary succession occurs when pioneer species move into an area that has no plants. Which organisms are common pioneer species?
A Conifer trees and tall grasses with roots that loosen the soil
B. O Mosses and lichens that can grow on rocky surfaces
c. Grasses and weeds that arrive as seeds carried by the wind and then germinate in rich soil
D. O Vines and shrubs that help prevent the erosion of shallow soil
No
Answer:
C
Explanation:
Primary succession occurs when pioneer species move into an area that has no plants. This happens because of Mosses and lichens that can grow on rocky surfaces and the correct option is option B.
What is Primary Succession?Primary succession refers to the establishment of a community in an uninhabited area such as rocks.
It is a type of ecological succession (the evolution of a biological community’s ecological structure) in which plants and animals first colonize a barren, lifeless habitat.
Species that arrive first in the newly created environment are called pioneer species, and through their interactions they build a simple initial biological community.
Therefore, Primary succession occurs when pioneer species move into an area that has no plants. This happens because of Mosses and lichens that can grow on rocky surfaces and the correct option is option B.
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