The density of water at 4 degrees Celsius is 1.000 g/mg is it chemical or physical property?
Answer:
Physical Property
Explanation:
Density, mass, volume, color, melting and boiling points, etc. are all physical properties. No matter what changes, the chemical makeup stays the same.
Flamability, acidity, toxicity, etc. are chemical properties, because they chemically change the makeup of the object/thing.
What is the first step for response to an emergency situation?
Answer:
Back away from the situation and tell the supervisor/teacher
consider the following intermediate reactions. the overall chemical reaction is as follows. what is the correct enthalpy diagram using the hess law for this system
The question is incomplete, here is the complete question:
Consider the following intermediate reactions.
[tex]CH_4(g)+2O_2\rightarrow CO_2(g)+2H_2O(g);\Delta H_1=-802kJ[/tex]
The overall chemical reaction is as follows:
[tex]CH_4(g)+2O_2(g)\rightarrow CO_2(g)+2H_2O(I);\Delta H_{rxn}=-890kJ[/tex]
What is the correct enthalpy diagram using the Hess law for this system? (Image is attached below)
Answer: The correct image is Image A.
Explanation:
According to Hess’s law of constant heat summation, the amount of heat absorbed or evolved in a given chemical equation or system remains the same whether the process occurs in one step or in several steps.
According to this law, the enthalpies of these chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to know the required equation.
It also means that the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.
The given intermediate reactions are:
[tex]CH_4(g)+2O_2(g)\rightarrow CO_2(g)+2H_2O(l);\Delta H_1=-802kJ[/tex] ...(1)
[tex]2H_2O(g)\rightarrow 2H_2O(l);\Delta H_2=-88kJ[/tex] ....(2)
The final reaction follows:
[tex]CH_4(g)+2O_2(g)\rightarrow CO_2(g)+2H_2O(l);\Delta H_{rxn}=-890kJ[/tex]
Negative sign of the enthalpy represents the heat is being released which is represented by the downward arrow in the diagram.
By adding equation 1 and equation 2, we get:
[tex]\Delta H_{rxn}=\Delta H_1+\Delta H_2\\\\\Delta H_{rxn}=-802+(-88)=-890kJ[/tex]
Hence, the correct image is image A.
Answer:
A
Explanation:
Edg
Which planet has these characteristics?
- cold at the surface, hot at the core
- 30 moons orbiting it
- the largest rings
- a surface that is not solid
Pluto
Jupiter
Neptune
Saturn
A solid reactant is placed into a beaker of a warm water. The liquid vigorously bubbles as the solid dissolves into the solution. What will most likely happen if the temperature of the liquid is slightly reduced?
Answer:
Fewer bubbles will be produced because of fewer collisions of reactant molecules
Explanation:
As the solid dissolves into the solution after the liquid has been vigorously bubbled, if the temperature of the liquid is reduced a little, what will happen is that fewer bubbles will be produced as a result of lesser amount of collisions occurring between the reactant molecules
Answer:
b
Explanation:
Compare the patterns of earthquakes, volcanoes, and mountain ranges on earth?
At diverging plate boundaries, earthquakes occurs as the plates pull away from each other. Volcanoes form between the plates, as magma rises upward from the underlying mantle. Second, two plates may come together, at a converging plate boundary. Two situations are possible at converging plate boundaries.
Mountain ranges, volcanoes, and earthquakes can all be found when convergent borders occur. Finally, transform boundary locations are also the site of earthquakes. Every learning exercise we completed served as a piece of proof.
What is earthquakes ?When two chunks of the ground abruptly slide past one another, an earthquake results. The fault or fault plane is the area where they slide.
Earthquakes often result from subsurface rock breaking unexpectedly and fast movement along a fault. The seismic waves that cause the ground to tremble are brought on by this quick release of energy.
A fault line causes the Earth's crust to suddenly shift, causing an earthquake. The epicenter is the place where an earthquake first occurs. Near the epicenter of an earthquake, shaking may be quite violent.
Thus, mountain ranges, volcanoes, and earthquakes can all be found when convergent borders occur.
To learn more about earthquakes, follow the link ;
https://brainly.com/question/1296104
#SPJ2
what is the meaning of science
Answer:
Here goes
Explanation:
the intellectual and practical activity encompassing the systematic study of the structure and behaviour of the physical and natural world through observation and experiment.
A line in the Balmer series of the emission spectrum of atomic hydrogen is observed at a wavelength of 486.3 nm. Deduce the upper state principal quantum number for this transition.
Answer:
4
Explanation:
The Balmer series refers to to a series of spectral emission lines of the hydrogen atom that occurs when an electron moves from higher energy levels to the energy level of n= 2.
Hence;
λ = 486.3 * 10^-9 m
RH = 1.097 * 10^7 m-1
nf = 2
ni = ?
Using the formula;
1/λ = RH (1/nf^2 - 1/ni^2)
1/486.3 * 10^-9 = 1.097 * 10^7 (1/4 - 1/ni^2)
2.06 * 10^6/1.097 * 10^7 = (1/4 - 1/ni^2)
0.188 = 1/4 - 1/ni^2
1/ni^2 = 1/4 - 0.188
1/ni^2 = 0.25 - 0.188
1/ni^2 = 0.062
ni^2 = 16
ni = 4
Which of the following describes a perpetual-motion machine?
A. A battery that contains one oxidized metal and one reduced metal
B. A renewable energy source
C. A motor that requires no energy input once it is running
D. An electric motor that is powered by an electromagnet
SUBMIT
Answer:
a motor that requires no energy input once it is running
Answer:
c
Explanation:
a p e x :)
PLEASE HELP with these problems ASAP!!! 30 points!!
Answer:
which?........................
Definition in your own words
Will check if you got it from online.
Word: States (Phases) of Matter
Answer:
Liquid,gas,solid and plasma
Explanation:
There four phases of matter. These phases are the gas phase(steam), the liquid phase(water), the solid phase(Ice) and finally the plasma phase(moucous).
In the nucleus, a sodium atom (Na) has 11p+ and 12 nºo. How would you write the
sodium ion based on the loss of one electron?
Answer:
Na⁺
Explanation:
Given parameters:
Number of protons = 11
Number of neutrons = 12
Writing the expression based on sodium ion that lost one electron;
In a neutral sodium atom, the number of protons and electrons are the same. Number of protons are the the positively charged particles in an atom.
Number of electrons are the negatively charged particles.
If an atom loses electron for instance sodium:
Number of electrons = 10
Number of protons = 11
Charge on the atom = 11 - 10 = 1+
So, the symbol of the atom is Na⁺
I promise it's easy points
Describe the life cycle of a star what determines the path a star could take.
Which element consists of positive ions immersed in a “sea” of mobile electrons?
A.
Sulfur
B.
Nitrogen
C.
Calcium
D.
Chlorine
Answer:
Calcium
Explanation:
Calcium is the only metal here
hope this helps...
A positive ion is an atom or a molecule that has a net positive charge. The charge of the proton in an atom or a molecule is positive.
A subatomic found in the atom or the molecule that lacks a positive charge is called an electron.
The correct answer is:
Option C. Calcium
This can be explained by:
Compounds or substances which have positive ions engaged in a sea of movable electrons are assumed to be metals.The electrons existing in the metals encompass the positively loaded nuclei instead of projecting their assigned atoms.Calcium is the only metal found in the given list and hence is the answer.
To learn more about electrons, protons and metals follow the link:
https://brainly.com/question/21940587
The Goodyear blimp contains 5.7 x 10^6 L of helium at 25 degrees Celsius and 1 atm. What is the mass in grams of the helium inside the blimp
Answer:
1.72x10⁻⁵ g
Explanation:
To solve this problem we use the PV=nRT equation, where:
P = 1 atmV = 5.7x10⁶ Ln = ?R = 0.082 atm·L·mol⁻¹·K⁻¹T = 25 °C ⇒ (25+273.16) = 298.16 KAnd we solve for n:
1 atm * 5.7x10⁶ L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 298.16 K n = 4.29x10⁻⁶ molFinally we convert moles of helium to grams, using its molar mass:
4.29x10⁻⁶ mol * 4 g/mol = 1.72x10⁻⁵ g