Answer:
How do ecosystems respond to natural disasters such as fires and floods :
Explanation:
They recover in stages, gradually returning to the original system. … She plans to create various physical and biological disturbances in the ecosystem to see how populations change over time.
1. How many molecules are equal to 1x10(-5) moles?
Answer:
10×(-5)=-50 which means their are -50 moles
What is a frogs favorite food
Answer:
Flys because frogs like to eat flys
Answer:
some prefer crickets
Explanation:
Maybe you prefer crickets because they are easily available and a lifetime around them has made you comfortable with them. Maybe you prefer roaches and have your own colony. Maybe you prefer worms.
How many electrons are there in an atom of nickel?.
samuel has a hamster cage that is a rectangular prism. it is 20 inches long, 12 inches deep, and 10 inches tall. what is the volume, in cubic inches, of samuelâs hamster cage? group of answer choices
Answer: the answer is 2400
Explanation: 10 x 20=200 x 12=2400
how to find percent composition of a compound composed of 16.2 grams of calcium and 28.8 grams of chlorine
This problem is providing us with the mass of calcium and chlorine. Thus, the percent composition of each element in the compound is required and found to be 36 % for calcium and 64 % for chlorine, according to the following:
Percent compositions:In chemistry, we can use percent compositions in order to find a relationship between the relative amount of the elements in a compound and the mass of the very same compound.
In this case, given the mass of each element (chlorine and calcium), one can simply divide it by the sum of the masses of both calcium and chlorine to obtain the following:
[tex]\% Ca=\frac{16.2g}{16.2g+28.8g}*100\%= 36\%\\\\\% Ca=\frac{28.8g}{16.2g+28.8g}*100\%= 64\%\\[/tex]
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Gold has a specific gravity of almost 20. A 5-gallon bucket of water weighs 40 pounds. How much would a 5-gallon bucket of gold weigh?.
Answer:
800 pounds
Explanation:
your welcome
Gold has a specific gravity of almost 20. A 5-gallon bucket of water weighs 40 pounds. A 5-gallon bucket of gold would weigh around 800 pounds.
To determine how much a 5-gallon bucket of gold would weigh, we need to consider the specific gravity of gold. Specific gravity is a measure of the density of a substance compared to the density of water. Gold has a specific gravity of almost 20, which means it is approximately 20 times denser than water.
We know that a 5-gallon bucket of water weighs 40 pounds. Since gold is 20 times denser than water, a 5-gallon bucket of gold would weigh 20 times more than a 5-gallon bucket of water. Therefore, the weight of a 5-gallon bucket of gold can be calculated as follows:
40 pounds x 20 = 800 poundsBased on this analysis, a 5-gallon bucket of gold would weigh approximately 800 pounds.
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What are 5 of the critical events in evolution that occurred in the Paleozoic era?!!
Answer:
Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian
Explanation:
These all occurred in the paleozoic Era I hope you do great good luck <3
When we say that U.S. Treasuries act as benchmark bonds we mean that yields on other bonds are measured in terms of the _____________ over Treasuries.
The U.S. Treasuries act as benchmark bonds implies that they're measured in terms of the spread with regards to other treasuries.
What is a benchmark bond?A benchmark bond simply means the standard measure of the risk of a bond against the other bonds.
When we say that U.S. Treasuries act as benchmark bonds we mean that yields on other bonds are measured in terms of the spread over treasuries.
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A physical change is ...
O properties of the material do not change, but the identity of matter does change.
O properties of the material and identity of matter both change.
O properties of the material change, but the identity of matter does not change.
Answer:
the answer is c I just took the test
In the first step in the life cycle of a
star, it is called a:
Which of the following represents a chemical change?
Answer:
Gasoline combusting in an engine
Explanation:
When gasoline is ignited, carbon dioxide and water are produced.
Calculate the mass of butane needed to produce 71.9 g of carbon dioxide.
1) balanced chemical equation
[tex]2\ C_{4}H_{10}_{(g)}\ +\ 13\ O_{2}_{(g)}\ ->\ 10\ H_{2}O_{(g)}\ +\ 8\ CO_{2}_{(g)}[/tex]
2) convert mass of CO₂ to moles
[tex]=71.9g\ CO_{2}\ x\ \frac{1\ mol\ CO_{2}}{44.01g\ CO_{2}} \\\\=1.633719609[/tex]
3) multiply by molar ratio
[tex]=1.633719609\ mol\ CO_{2}\ x\ \frac{2\ mol\ C_{4}H_{10}}{8\ mol\ CO_{2}}\\\\=0.4084299023[/tex]
4) convert moles of C₄H₁₀ to mass
[tex]=0.4084299023\ mol\ C_{4}H_{10}\ x\ \frac{58.14g\ C_{4}H_{10}}{1\ mol\ C_{4}H_{10}}\\\\=23.74611452[/tex]
= 23.7 grams of C₄H₁₀ is needed to produce 71.9 grams of CO₂
why are the red blood cells crescent-shaped
Answer:
The ref blood cells are shaped like sickles or crescent moons, sticky cells can get stuck in small blood vessels which can slow or block blood flow and oxygen to parts of the body
Why does water boil at 100°C and methane boil at -161°C
Please help me
Explanation:
The main difference in boiling points are due to intermolecular attractions. With water, it is a polar molecule, has hydrogen bonding, and exhibits london forces. All of these combined, make H2O bonds very strong, which means more energy is required to transition from one state to another, leading to higher boiling points.
On the other hand, methane is a non-polar molecule that only exhibits very weak london forces. It being a non-polar molecule, means its bonds are very weak, which means less energy is required to boil methane.
Also, the Celsius system was made so that water would be a reference. This is a reason for why its boiling point temperature is convenient
Which electron subshell is being filled for the rare earth series of elements on the periodic table?.
Explanation:
honestly speaking the lanthanides have electron configurations that follow the Aufbau rule, and the 4f sublevel is filled as atomic number increases from cerium (Ce) to lutetium (Lu).
5 F2 (g) + 2 NH3 (g) -> N2F4 (g) + 6 HF (g)
If you reacted 4.3 miles of F2 how many moles of HF would be produced?
Answer:5 F2 (g) + 2 NH3 (g) -> N2F4 (g) + 6 HF (g)
Explanation:moles = mass/molar mass
mass =molar mass x mole
a) moles of Nh3 = 58.5/17 = 3.44 moles
the mole ratio of F2:NH3 = 5:2
the moles of F2 =3.44x5/2=8.6 moles
mass= 8.6 x 38 = 326.8 grams of F2
B) moles of Hf = 3.89/20 = 0.1945 moles
mole ratio NH3:Hf= 2:6
moles of NH3 = 0.1945 x2/6 = 0.0648 moles
mass =0.0648 x17 = 1.102 grams of NH3
C) moles of f2 = 217/38 =5.711 moles
mole ratio N2F6:F2 =5:1
moles of N2F4=5.711 x1/5=1.142 moles
mass = 1.142 x104 = 118.77 grams of N2F4
Why doesn’t neon readily form an ionic bond?
By definition of noble gases, neon does not easily form an ionic bond because it belongs to the group of noble or inert gases, so its reactivity is practically nil.
Noble gasesNoble gases are not very reactive, that is, they practically do not form chemical compounds. This means that they do not react with other substances, nor do they even react between atoms of the same gas, as is the case with diatomic gases such as oxygen (O₂).
The chemical stability of the noble gases and therefore the absence of spontaneous evolution towards any other chemical form, implies that they are already in a state of maximum stability.
All chemical transformations involve valence electrons, they are involved in the process of covalent bond formation and the formation of ions. Therefore, the practically null reactivity of the noble gases is due to the fact that they have a complete valence shell, which gives them a low tendency to capture or release electrons.
Since the noble gases do not react with the other elements, they are also called inert gases.
NeonNeon does not easily form an ionic bond because it belongs to the group of noble or inert gases, so its reactivity is practically nil.
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Suppose you were given a substance and asked to determine whether it was a plasma. What characteristics would be true of the substance for it to be a plasma? Check all that apply. The particles in the substance would collide more often. The particles in the substance would have high kinetic energy. The particles in the substance would be close to each other. The substance would have a fixed shape and volume. The substance would be composed of ionized particles.
Statement 1, 2, and 5 are true about plasma.
Plasma is a conducting medium that can conduct charge when the atoms are ionized and is also referred to as the fourth state of matter.
What are the characteristics of plasma?Plasma has particles whose kinetic energy is high as they move too quickly because they are not too closely located rather are far apart.
The particles of the plasma located are far apart and collide more frequently compared to other states of the matter. They have both positive and negative charges.
The particles has a charge but has no fixed volume. The charged particles of the plasma make them electrically conductors. It also shows electromagnetism.
Therefore, statements 1, 2, and 5 are true about plasma.
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Answer:
1, 2, and 5
Explanation:
In an pot of water you have 2.5 L at 25oC. How much energy will be needed to heat up the water to 100oC
Answer:
784500 Joules
Explanation:
To start, you will need an equation to find the change in energy. This can be found by using [tex]Q = mCT[/tex] or by using integrated heat capacities.
to find the mass of water,
[tex]2.5L * 1kg/L = 2.5 kg water[/tex]
1kg/L is the density of water.
Then, [tex]Q = 2.5kg*4.184J/gC*(100-25)[/tex]
Notice that all of the units do not cancel out properly, so some unit conversions are needed to find the correct answer.
1. The modern periodic table organizes the elements based on?
Answer:
By element with the lowest atomic number to the highest atomic number.
Explanation:
How many protons and neutrons are in an atom of ^249 Bk?
What does weight measure?
Quantity of matter in an object
How much space an object takes up
Force of gravity acting on an object
How long it takes for an event to occur
Answer:
Force of gravity on an object
Explanation:
Let's derive this
Mass=mAcceleration due to gravity=gApply Newton's second law
[tex]\\ \tt\hookrightarrow F=ma[/tex]
So
[tex]\\ \tt\hookrightarrow W=mg[/tex]
Describe the relationship between the number of carbon, hydrogen, and oxygen atoms in carbohydrates.
Please help me
Which of the following statements about volatility are true? Select all that apply.
A. Volatility is a measure of how easily a liquid evaporates.
B. Volatility is a measure of how easily a liquid condenses.
C. Volatile liquids have a large number of molecules in the gas phase above the liquid.
D. Volatile liquids have a small number of molecules in the gas phase above the liquid.
E. Stronger intermolecular forces result in higher volatility.
F. Stronger intermolecular forces result in lower volatility.
Answer:
C D E
Explanation:
i took the test
Volatility is a measure of how easily a liquid evaporates and it decreases with increase in intermolecular forces.Volatile liquids have large number of molecules in the gas phase above liquid phase. Hence, options A, C, F are correct.
What is intermolecular force?Intermolecular force is the force which binds the molecules or atoms in compound together. Three are various kinds of intermolecular forces such as ionic bond, covalent , H-bonding, dipole forces etc.
When liquids molecules have strong intermolecular interaction between them they will not be capable of escaping into the gaseous state. Hence volatility decreases with increase in intermolecular force.
For a volatile substance, the number of molecules which are escaped into gas phase above liquid phase during evaporation will be higher. More volatile liquids will have lower boiling point . Hence, the correct statements regarding volatility are A, C and F.
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Please help me guys I’m so lost
Answer:
3 seconds
Have a good day!
Answer:
3secs
Explanation:
speed = distance/time
d= 300m
s=100m/s
100= 300/t
100t=300
divide both side by 100
t= 300/100
t=3sec
an atom has 70 protons, 70 electrons, and 99 neutrons. what is the mass number? group of answer choices
Answer:
169
Explanation:
protons+neutrons=atomic mass
70+99=169
Whose view that matter as infinitely divisible was considered correct for most of the last two millenia?.
Answer:
Aristotle believed that everything was comprised of earth, air, water, and fire, which were infinitely divisible.
how much heat is required to raise the temperature of a 5.45-g sample of iron (specific heat = 0.450 j/g°c) from 25.0°c to 79.8°c?
Answer:
134.397 Joules
Explanation:
Using the formula:
E = C × m × Δθ (where E is Energy, C is specific heat capacity and Δθ is change in temperature)
So E = 0.45×5.45×(79.8-25)
So E = 134.397 Joules
The heat required to raise the temperature of 5.45g of iron is equal to 134.4 J.
What is the specific heat capacity?The specific heat capacity is described as the quantity of heat required to raise the temperature of one unit of substance by one-degree Celsius. The specific heat capacity of the substance depends upon the nature of the substance, not its quantity.
The mathematical formula can be used to determine the specific heat is equal to:
Q = m×C×ΔT
Given, the mass of the sample of iron, m = 5.45 g
The initial temperature of the sample, T₁ = 25°C
The final temperature of the sample, T₂ = 79.8°C
The specific heat capacity of iron, C = 0.450 J/g.°C
The heat required for the sample of iron will be:
Q = 5.45 × (0.450) × (79.8 -25)
Q = 134.4 J
Therefore, the heat required to raise the temperature of a 5.45g sample of iron is 134.4 J.
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6. Much of the respiratory system is lined with
a.
fibrous connective tissue
b.
flagela
C.
mucus membrane
d.
hyaline cartilage
Answer:
the answer is Respiratory epithelium, or airway epithelium, is a type of ciliated columnar epithelium found lining most of the respiratory tract as respiratory mucosa, where it serves to moisten and protect the airways. But I don't see that option here.
Name two ways that carbon(usually in the dorm of C02) enters the atmosphere
Answer:
When animals breathe or decompose (decay), carbonate rocks weather, forest fires occur, and volcanoes erupt, carbon dioxide is released into the atmosphere naturally. Carbon dioxide is also released into the atmosphere as a result of human activities such as fossil fuel combustion and forest fires.
