Examples of reversible changes. Melting: Melting is when solid converts into a liquid after heating. Example of melting is turning of ice into water. ... Example of boiling is turning water into water vapour.
Answer: We live at the bottom of a gaseous envelope the atmosphere--that is bound gravity to the planet Earth. The circulation of our atmosphere is a complex process because of the Earth's rotation and the tilt of its axis. The Earth's axis is inclined 23.5° from the ecliptic, the plane of the Earth's orbit around the Sun. Due to this inclination, vertical rays of the Sun strike 23.5° N. latitude, the Tropic of Cancer, at summer solstice in late June. At winter solstice, the vertical rays strike 23.5° S. Latitude, the Tropic of Capricorn. In the Northern Hemisphere, the summer solstice day has the most daylight hours, and the winter solstice has the fewest daylight hours each year. The tilt of the axis allows differential heating of the Earth's surface, which causes seasonal changes in the global circulation. On a planetary scale, the circulation of air between the hot Equator and the cold North and South Poles creates pressure belts that influence weather. Air warmed by the Sun rises at the Equator, cools as it moves toward the poles, descends as cold air over the poles, and warms again as it moves over the surface of the Earth toward the Equator. This simple pattern of atmospheric convection.
The number of moles in the resulting solution can be calculated by adding together the number of moles from the individual solution. That is calculated as follows,
total number of moles = (35 mL)(1 L/1000 mL)(1 mole/L) + (60 mL)(1 L/1000 mL)(0.6 moles / L) = 0.071 moles
The precipitation reaction is,
KBr + AgNO3 --> AgBr + KNO3
From the equation, each mole of the KBr will need one mole of AgNO3. Hence, 0.071 mole of AgNO3 will also be needed. Calculating for the mass,
mass of AgNO3 = (0.071 moles)(169.87 g / mol) = 12.06 g
ANSWER: 12.06 grams
Answer: option C. NaCl + LiNO₃ ---> NaNO₃ + LiCl
Explanation:
1) An oxidation-reduction reaction is the oxidation of at least one element and the reduction of at least one element.
2) Oxidation is the increase of the oxidation number, due to the loss of electrons.
3) Reduction is the reduction of the oxidation number, due to the gain of electrons.
4) You can tell whenever a reaction is an oxidation-reduction by observing the oxidation numbers: if two elements changed its oxidation number (one increases and one reduces) it is an oxidation - reduction, else it is not.
5) Oxidation numbers:
i) NaCl
Na: 1+, Cl: 1-.
ii) LiNO₃
Li: 1+, N: 5+, O: 2-
iii) NaNO₃
Na: 1+, N: 5+, O: 2-
iv) LiCl
Li: 1+, Cl: 1-.
There you have that the oxidation numbers of the five elements (Na, N, O, Li, and Cl) remained unchanged.
None element was reduced and none element was oxidized, so you conclude that this is not an oxidation-reduction reaction.
