What are the main organs for the respiratory system?
Answer:
lungs and blood vessels, airway
Explanation:
because the respiratory system are a system that helps people breate. the lungs breathe in oxygen and then breathe out carbon dioxide. the blood vessels carries the oxygen into the body to other part of the system in the body that needed oxygen to make glucose.
A solar heating specialist is considering paraffin (Cp = 2.90 J/g O C) as a storage material for heat. How many kg of paraffin would be needed to collect the amount of energy as 4.73 x 10 3 kg of water?
Answer:
Mass of paraffin that would be needed to collect the amount of energy as 4.73 x 10³ kg of water is 6.85 * 10³ kg
Explanation:
Specific heat capacity of paraffin, Cp = 2.90 J/g.°C = 2900 J/kg.°C
Specific heat capacity of water = 4.20 J/g.°C = 4200 J/kg.°C
Amount of heat energy that can be stored by 4.73 * 10³ kg of water heated through a degree rise in temperature can be calculated as below:
Using H = mCpθ where m is mass of substance, Cp is specific heat capacity and θ is temperature change
H = 4.73 * 10³ kg * 4200 J/kg.°C * 1°C
H = 19866000 J
Mass of paraffin that would be needed to collect the amount of energy as 4.73 x 10 3 kg of water for a degree rise in temperature is calculated as follows:
H = mCpθ
19866000J = m * 2900 J/kg.°C * 1°C
m = 19866000J / 2900 J/kg
m = 6850.34 kg = 6.85 * 10³ kg
Therefore, mass of paraffin that would be needed to collect the amount of energy as 4.73 x 10³ kg of water is 6.85 * 10³ kg
In multicellular organismscells that become specialized to perform a specific function are called?
A. Organelle
B. Tissue
C. Organ
D. Epithelial
Answer:
Answer:
C. Organ
Explanation:
definition- "In biology, an organ is a collection of tissues that structurally form a functional unit specialized to perform a particular function.
balence the following equation : _____ NH3 --------> _____ N2 + _____ H2
pls can i have the explanation too
2 NH3 -> 1 N2 + 3 H2
Explanation:
That would be the answer to this
Which BEST explains why the ice cube sank in the liquid?
Answer:
The liquid could be cooking oil
Explanation:
Density contributes to sinking or floating. If this is vegetable oil of something like that, the ice cube will sink.
How many grams of sodium are in
1.000 mole of sodium?
Answer:
Explanation:
How many atoms are in a 3.5 g sample of sodium (Na)? In this example, multiply the grams of Na by the conversion factor 1 mol Na/ 22.98 g Na, with 22.98g being the molar mass of one mole of Na, which then allows cancelation of grams, leaving moles of Na.
Answer:
ONE MOLE of any element has 6.023x1023 atoms of that element. Therefore 1 mole or 22.99 grams of Na = 6.023x1023 atoms of Na.
Explanation:
An ionic bond is a bond that forms between..
help
Answer:
ions with opposite charge
Explanation:
ionic bond is formed between oppositely charged ions in a chemical compound.
Answer: ions with opposite charges
Explanation:
How many grams of aluminum oxide (Al2O3) will be formed from 10.0 grams of aluminum (Al)? 4 AL + 3 02 --> 2 AL203
Answer:
Mass = 18.9 g
Explanation:
Given data:
Mass of Al₂O₃ formed = ?
Mass of Al = 10.0 g
Solution:
Chemical equation:
4Al + 3O₂ → 2Al₂O₃
Number of moles of Al:
Number of moles = mass/molar mass
Number of moles = 10.0 g/ 27 g/mol
Number of moles = 0.37 mol
Now we will compare the moles of Al and Al₂O₃.
Al : Al₂O₃
4 : 2
0.37 : 2/4×0.37 = 0.185 mol
Mass of Al₂O₃:
Mass = number of moles × molar mass
Mass = 0.185 mol × 101.9 g/mol
Mass = 18.9 g
a single 3s electron in a magnesium atom is shielded by
a) the 2s and the 2p electrons only
b) the 1s, 2s, and 2p electrons, along with the other 3s electron
c) the 1s, 2s, and 2p electrons
d) the 1s and 2s electrons only
Answer:
D
Explanation:
because the answer is D
The characteristics of the shielding we can find the correct answer for the shielding of a magnesium electron is:
c) The 1s, 2s, and 2p electrons
The quantum mechanic shielding is the effect that the electrons closest to the atomic nucleus have to create a potential barrier for the electrons of the higher orbits.
The net attractive force on the electron of Magnesium is diminished by the effect of the electrons in the lower shells n = 1 and n = 2
As the level n = 2 is closer to the level n = 3 this is the one that creates the greatest shielding, but the innermost level also contributes a part.
The other electron at the same energy level n = 3, has an effect due to the Pauli exclusion principle, it forces it to have an opposite spin, to be able to be together, creating an exchange energy between the two electrons, but it does not shield the core charge as they are together.
Let's examine the different claims
a) False. Electrons at level n = 1 also create shielding
b) False. Electrons at levels n = 1 and n=2 create a shield, but the other electron is at the same level n = 3 and does not shield the nucleus.
c) True. The internal levels serves as a screen for the electron each with a different magnitude
d) False. The 2p orbital creates a large shield since it has 6 electrons
In conclusion, using the characteristics of the shielding we can find the correct answer for the shielding of a magnesium electron is:
c) The 1s, 2s, and 2p electrons
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Madame puts a teabag in her mug of water. Before she has a chance to stir the tea, she hears a sound and goes to see what it was. When she comes back, the tea is distributed throughout the mug. It looks like someone stirred it, but no one else is home. What happened?
Answer:
See the answer below
Explanation:
What really happened was that the component molecule present in the teabag became hydrated as a result of dissolution in water. Once dissolved, the molecules start to move about from the region of higher concentration - that is, the tea bag - to the region of lower concentration until the molecules become uniformly diffused throughout the water in the mug.
The state of matter with the slowest moving atoms is _
A: plasma
B: liquid
C: solid
D: gas
The state of matter with the slowest moving atoms is solid. The correct answer is option C.
State of matter refers to the physical form that matter can exist in, such as solid, liquid, gas, and plasma.
In a solid, the particles are closely packed together and have a fixed position in a crystal lattice structure. The intermolecular forces between the particles are strong, which causes them to vibrate in place.
The particles in a solid have the lowest amount of kinetic energy compared to the other states of matter, which means they move the slowest.Therefore, the slowest moving atoms are found in the solid state of matter. Option C is the correct answer.
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Over the past 60 years, the level of carbon dioxide in the atmosphere has been continually increasing. Many scientists hypothesize that this increase has led to an imbalance in the carbon cycle and a climatic trend known as global warming.
In which of the following ways could humans help the carbon cycle return to normal?
Cap volcanoes so that they do not release more carbon dioxide
cut down trees and other large plants that depend on carbon dioxide
reduce the amount of fossil fuels they combust
pump nitrogen and oxygen into the air to help rebalance the atmosphere
Answer:
C.
reduce the amount of fossil fuels they combust
Explanation:
study island
How do you balance Sb+I2=SbI3 show work please
Answer:
2Sb + 3I₂ → 2SbI₃
Explanation:
The reaction expression we need to balance is:
Sb + I₂ → SbI₃
To balance this expression, we need to assign the variables a,b and c to each specie as the coefficient that will balance the expression.
aSb + bI₂ → cSbI₃
Conserving Sb : a = c
I : 2b = 3c
let a = 1, c = 1, b = [tex]\frac{3}{2}[/tex]
Multiply through by 2;
a = 2, b = 3 and c = 2
2Sb + 3I₂ → 2SbI₃
What is the name of the ability to use up energy in one second
Answer:
Work
Explanation:
Work is defined as the ability to use energy in one second and its SI unit is same as energy that is joule.
Work refers to the energy utilized to displace an object over a distance by an external force in one direction and in given time period which can be one second as well.
Hence, the correct answer is "work".
1. The forks shown are made of silver (Ag). Some of the silver forks
shown have lost their luster—they have become tarnished. This is an
example of Type here.
Answer:
Corrosion
Explanation:
Silver, although known as a nobble metal, is also subject to corrosion process such as having silver tarnish when exposed to sulfur and air.
Tarnishing occurs on the surfaces of some metals such as brass, copper, and silver, which results in a corroded layer. Silver tarnish occurs from the chemical reaction that takes place when silver is exposed to sulfur which results in the formation of black Ag₂S
In order to restore the original silver surface, the silver tarnish (silver sulfide) layer is removed.
We have the statement presented here as follows;
The forks shown are made of silver (Ag). Some of the silver forks shown have lost their luster - they have become tarnished. This is an example of Corrosion.
Some common substances and their chemical formulas are listed in the chart.
Which of these substances are elements?
Answer:
We heart you don't have all the information you just got some common substances and their chemical formulas are listed in the chart? That we don't have the chart to see which of the substances are elements
Explanation:
sorry about that if you can take a picture of it and repost it I am sure I could answer it for you
A person stands on the floor. What does Newton's third law say must happen
A . The floor pushes up on the person
B. the floor will accelerate
C. the person will accelerate
D. Gravity pulls down on the floor.
he dose of a medicine is 3.0 mg/kg of body mass. Calculate the dose in milligrams for a 112-lb person.
Group of answer choices
300
740
150
3.0 × 105
74
1500
Question 2
Put the events below in the order in which they happened.
a) The marble is moved up the ramp using a pulley system.
b) The marble is placed on a wooden sled.
c) Iron wedges are used to break the massive marble.
d) Masons begin carving the marble.
b, a, c, d
b, c, a, d
c, d, b, a
c, b, d, a
Answer:
The event placed in order is;
b, a, c, d
Explanation:
1) b) The marble is placed on a wooden sled
Before the marble is lifted up the ramp, it is placed on a wooden sled that allows the pulley system which can be attached to the wooden sled to lift it up the ramp
2) a) The marble is moved up the ramp using the pulley system
The attached pulley system is then used to move the marble up the ramp
3) c) Iron wedges are used to break the massive marble
The massive marble is broken into pieces that can be worked upon by each mason
4) d) Masons begin carving the marble
The masons (more than one mason) begin carving the pieces of marbles into shape
How many electrons will oxygen have to have to have a +2 charge?
Answer: here is your answer hope this helps I’m sorry if I get it wrong
Explanation:
This means that the nuclei of all oxygen atoms have eight protons. A neutral oxygen atom will also have eight electrons. In an oxygen ion with a 2− charge, the number of protons is still 8, but the number of electrons is 10. This results in the oxygen ion having an octet (8) of valence electrons.
A student has one mole of zinc and one mole of oxygen. Which of the following is true for both samples? *
There are equal masses of zinc and oxygen
There are equal numbers of atoms of zinc and oxygen
There are equal volumes of zinc and oxygen
There are equal densities of zinc and oxygen
Answer:
2
Explanation:
A student wants to use the lever to lift the book. At
which point should she push downward to use the
least amount of force to lift the book?
Need help don’t understand this??!
Answer:
US. With an installed capacity of 3,639MW in 2018, the US is the leading producer of geothermal energy across the world, producing 16.7 billion kilowatt hours (kWh) of geothermal energy throughout the year. ...
Indonesia. ...
Philippines. ...
Turkey. ...
New Zealand. ...
Mexico. ...
Italy. ...
Iceland.
_cubr +_F2 —> Cuf +_ Br2
Answer:
2CuBr +1 F2 ----> 2CuF + 1 Br2
Explanation:
2CuBr +1 F2 ----> 2Cuf + 1 Br2
Check answer
Cu is 2 Cu is 2
Br is 2 Br is 2
F is 2 F is 2
Why is there an earthquake and volcano pattern?
answer without stealing from g.oogle please.
Answer:
The description and the illustration throughout the question are summarized below.
Explanation:
Yes, there's a pattern of earthquakes as well as volcanoes even though, destruction, injury, as well as ultimately harm all occur forward to volcanoes as well as earthquakes. Theoretically, there are many 2 kinds of surfaces, oceanic as well as continental. Multiple sorts of movement usually happen together across numerous categories of boundary plates.A sample of a compound contains 24 grams of carbon and 64 grams of oxygen. What
is the empirical formula of this compound?
Answer:
CO2
Explanation:
it's the simplest whole number ratio of atoms of each element in the compound.
Answer:
C2O4
Explanation:
Complete combustion of a 0.600-g sample of a compound in a bomb calorimeter releases 24.0 kJ of heat. The bomb calorimeter has a mass of 1.30 kg and a specific heat of 3.41 J/(gi°C). If the initial temperature of the calorimeter is 25.5°C, what is its final temperature?
The final temperature, t₂ = 30.9 °C
Further explanationGiven
24.0 kJ of heat = 24,000 J
Mass of calorimeter = 1.3 kg = 1300 g
Cs = 3.41 J/g°C
t₁= 25.5 °C
Required
The final temperature, t₂
Solution
Q = m.Cs.Δt
Q out (combustion of compound) = Q in (calorimeter)
24,000 = 1300 x 3.41 x (t₂-25.5)
t₂ = 30.9 °C
Answer:
a) 30.9
Explanation:
edge 2021
Please Help!!!!!!!!!!!!!
Answer:
The answer is B, 106
Explanation:
looked it up
3. How does the wave change if the volume increases?
Answer:
When you increase the volume of the tone, you are adding energy to the sound wave, resulting in larger vibrations
Explanation:
Jonathan used the following soil triangle to identify a sample of soil as sandy clay. Which description of soil likely allowed Jonathan to make this identification.
A. Mostly large grains, with a sticky texture, 55% sand, 40% clay, 5% silt.
B. Mostly large grains, with a gritty texture, 45% sand, 5% clay, 45% silt.
C. Mostly small grains, with a smooth texture, 30% sand, 5% clay, 65% silt.
D. Mostly small grains, with a sticky texture, 30% sand, 50% clay, 20% silt.
Answer:
Mostly large grains, with a sticky texture, 55% sand, 40% clay, and 5% silt
Explanation: I took the test, hope it helps.
Mostly large grains, with a sticky texture, 55% sand, 40% clay, 5% silt. The correct option is A.
What is soil triangle?One side of the triangle represents sand, the other side represents clay, and the third side represents silt.
A soil texture triangle is used to classify a soil's texture class. The percentages of sand, silt, and clay are scaled on the sides of the soil texture triangle.
Clay percentages are read across the triangle from left to right. Silt is read from top to bottom, upper right to bottom.
Jonathan used the soil triangle to identify a sample of soil as sandy clay; the soil description that allowed Jonathan to make this identification is 55% sand, 40% clay, and 5% silt, with mostly large grains and a sticky texture.
Thus, the correct option is A.
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