It feel hot and feel warmer than before the reaction started.
How many protons and neutrons are in an atom of ^249 Bk?
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.
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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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 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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1. How many molecules are equal to 1x10(-5) moles?
Answer:
10×(-5)=-50 which means their are -50 moles
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
For the reaction: 2H2O → 2H2 O2, what is the total number of moles of O2 produced from the complete decomposition of 8 moles H2O?.
The complete dissociation of 8 moles of water produces 4 moles of oxygen.
The moles of reactants and products in the chemical reaction corresponds to the whole number representation of the stoichiometric coefficient in the balanced chemical equation.
Computation for moles of oxygen producedThe balanced chemical equation for the reaction is:
[tex]\rm 2\;H_2O\;\to\;2\;H_2\;+\;O_2[/tex]
From the balanced chemical equation, dissociation of 2 moles of water produces 1 mole of oxygen.
The moles of oxygen produced by 8 moles of water are:
[tex]\rm 2\;mol\;H_2O=1\;mol\;O_2\\\\8\;mol\;H_2O=\dfrac{1}{2}\;\times\;8\;mol\;O_2\\\\ 8\;mol\;H_2O=4\;mol\;O_2[/tex]
The moles of oxygen produced from 8 moles of water is 4 moles.
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What must two objects have in order for gravitational force to act on them?
Answer:
Mass and Distance
Explanation:
Because I know.
Answer:
"Gravity is a force of attraction between two objects that depends on two things: mass and distance. Mass: The greater the mass of two objects, the greater the gravitational force between the objects."
Explanation:
How many moles are in 2.64x1024 atoms of Chetnium?
Answer:
4.38 moles
Explanation:
It is the rounded off answer.
I need help name the parts of making up the female part of the flower and state what each part does. ( answer in your own unique words don’t copy and paste from the internet )
The female part is the pistil. The pistil usually is located in the center of the flower and is made up of three parts: the stigma, style, and ovary. The stigma is the sticky knob at the top of the pistil. It is attached to the long, tube like structure called the style.
Hope It Will Help You !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
What happens to the particles when you push the plunger in each syringe?
her
O the particles in syringe A move closer to other
Answer:
The answer is the particles in both syringe A and syringe B move closer together.
Explanation:
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
Contact Forces
Definition:
List of contact forces:
1........
2.......
3..
4.
5......
6.
7.....
2. Solid sodium reacts with gaseous chlorine to produce sodium chloride.
What will most likely happen when a component is removed from a reaction system at equilibrium?
A. The system will be unaffected by stress.
B. The addition of a catalyst will change the equilibrium.
C. The equilibrium system will shift to remove more of what was removed.
D. The equilibrium system will shift to replace some of what was removed.
When a component is removed from a reaction system at equilibrium, the equilibrium system will shift to replace some of what was removed.
Le Catelier's principleIt states that when a reaction is in equilibrium and one of the factors that affect the rate of reactions is applied, the equilibrium will shift to neutralize the effects of the constraint.
Every equilibrium system obeys Catelier's principle.
Thus, removing one of the components in a reaction that is in equilibrium will make the equilibrium shift to create more of the component being removed.
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Answer:
D : The equilibrium system will shift to replace some of what was removed.
Explanation:
pls give help me out>!
Answer:
3 because it the element that combined the form
How many electrons are there in an atom of nickel?.
what volume of a pure liquid (density 0.860 g/ml) has a mass of 0.360 kg?
Answer:
0.418ml
Explanation:
Density=Mass/Volume
By making Volume the subject of The formula=
Volume=Mass/Density
V=0.360/0.860=0.418ml
Students were asked to determine if the two slides are taken from plants or cells taken from animals
Answer: taken from plants
Explanation:
because
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).
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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How do ecosystems respond to natural disasters such as fires and floods?
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.
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
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
1. The modern periodic table organizes the elements based on?
Answer:
By element with the lowest atomic number to the highest atomic number.
Explanation:
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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