Which of the following statements holds true for a chemical change?A. In a chemical change, no new substance is formed
B. In a chemical change, a substance changes its phase
C. In a chemical change, the molecular structure of a substance changes
D. In a chemical change, one substance dissolves into another
Answers
Answer : The correct option is C.
Explanation :
Chemical change : It is defined as a change in which a new compounds are formed by the chemical reaction. Changes occurs in their chemical composition and properties.
The molecular structure of a substance changes in a chemical reaction is a chemical change.
- Change in molecular structure means that there is a breaking and formation of bonds in a molecule.
The example of chemical change in terms of change in molecular structure is the reaction of hydrogen with oxygen.
The reaction of hydrogen with oxygen is,
In this reaction, the H-H bond is break and O-H bond is form.
Related Questions
Why is gold preferred as a superior metal over silver and bronze?
A certain element has a melting point over 700 ∘C and a density less than 2.00 g/cm3. What is one possible identity for this element?
Light of three different wavelengths—325 nm, 455 nm, and 632 nm—is shined on a metal surface. The observations for each wavelength, labeled A, B, and C, is as follows: Observation A: No photoelectrons were observed. Observation B: Photoelectrons with a kinetic energy of 155 kJ/mol were observed Observation C: Photoelectrons with a kinetic energy of 51 kJ/mol were observedWhich observation corresponds to which wavelength of light?
An explosion that releases great amounts of heat is an example ofan exothermic process an implosion an endothermic process a phase change (please explain! Do not jus give me the answer... I know its not B or d.
Answers
Answer:
d
Explanation:
Answers
Answers
Explanation:
The given data is as follows.
V = 250.0 ml, T = 58^{o}C = 58 + 273 = 331 K
n = 2.48 moles, P = ? , R = 0.082 atm L /K mol
Therefore, calculate the pressure using ideal gas equation as follows.
PV = nRT
P =
=
= 0.269 atm
Thus, we can conclude that pressure of the given gas is 0.269 atm.
R = 0.082 atm
V = 250.0 mL / 1000 = 0.25 L
P = n x R x T / V
P = 2.48 x 0.082 x 331.15 / 0.25
P = 67.342 / 0.25
P = 269.368 atm
hope this helps!
B. nuclear separation.
C. nuclear fission.
D. nuclear fusion.
Answers
Answer is: C. nuclear fission.
Nuclear fission is a nuclear reaction or a radioactive decay where nucleus of atom split into smaller ligher nuclei.
Nuclear fission is exothermic reaction which release large amounts of energy (electromagnetic radiation or as kinetic energy, which heat reactors where fission reaction take place).
Answer: The process of splitting of an atom into two lighter atoms is called is called nuclear fission.
Explanation:
There are two types of nuclear decay reactions:
- Nuclear fission reactions: They are defined as the reaction in which, the heavier atoms splits into two or more lighter atoms. The number of atoms formed in this reaction increases from the given atoms.
- Nuclear fusion reactions: They are defined as the reaction in which, two or more lighter atoms combine to form a heavier atom. The number of atoms formed in this reaction decreases from the given atoms.
Hence, the process of splitting of an atom into two lighter atoms is called is called nuclear fission.
Question 16 options:
This is the answer >>>>>>>>As the phase changes occur, the freedom of motion of the particles increases.
As the phase changes occur, the freedom of motion of the particles decreases.
As the phase changes occur, the freedom of motion of the particles compresses.
As the phase changes occur, the freedom of motion of the particles is constant.
Answers
Answer:
A) As the phase changes occur, the freedom of motion of the particles increases.
Explanation:
As the phase changes occur, the freedom of motion of the particles increases.
Answers
Ocean waves require a physical medium (water) to propagate, while radio waves can travel through a vacuum or the atmosphere. Ocean waves have lower speeds compared to radio waves, which travel at the speed of light. They also have different frequency and wavelength ranges, with ocean waves having lower frequencies and longer wavelengths, while radio waves have higher frequencies and shorter wavelengths.
Ocean waves are generated by wind, seismic activity, or gravitational forces, while radio waves are generated by electronic devices. They are detected and utilized for different purposes, with ocean waves being measured for coastal engineering and oceanography, and radio waves being used for communication and radar systems.