Answer:
Two or more elements make up a compound.
Explanation:
Endothermic reactions absorb energy from the environment and make it cooler, such as photosynthesis in plants, while exothermic reactions release energy into the environment and make it hotter, like burning wood in a fireplace.
Endothermic and exothermic reactions are different in terms of energy absorption and release. In an endothermic reaction, energy in the form of heat is absorbed from the surroundings into the system (reaction). This causes the environment to become cooler. An example would be the process of photosynthesis in plants.
In contrast, an exothermic reaction releases energy into the surroundings. As a result, the environment around an exothermic reaction heats up. An example of an exothermic reaction is combustion, such as the burning of wood in a fireplace.
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Answer is: fluorine (F).
Group 17 (halogens) elements: fluorine (F), chlorine (Cl), bromine (Br) and iodine (I). They are very reactive and easily form many compounds.
Halogens need to gain one electron to have electron cofiguration like next to it noble gas.
Fluorine has atomic number 9, it means it has 9 protons and 9 electrons.
Fluorine tends to have eight electrons in outer shell like neon (noble gas) and gains one electron in chemical reaction. Fluorine is most reactive nonmetal.
Electron configuration of fluorine: ₉F 1s² 2s² 2p⁵.
Electron configuration of neon: ₁₀Ne 1s² 2s² 2p⁶.
B.would be very weak
C.would occur as normal
Answer:
Option (B)
Explanation:
Lake effect snow generally occurs when the cold winds extracts the water content (moisture) from the relatively warmer lakes and carries further and precipitates back on the land areas in the form of snow. Much of the snow is originated from the lake Ontario and it deposits on the nearby terrestrial areas.
So, when the Lake Ontario is cold enough like the air mass that blows in the continental arctic, then it indicates that the lake effect snow would be comparatively very much weak.
Thus, the correct answer is option (B).
Answer:
Explanation:
1. Apple: Characteristics - Red color, round shape, medium size.
- Physical Change: Cutting the apple into slices.
- Chemical Change: Apple slices turning brown when exposed to air.
2. Candle: Characteristics - White color, cylindrical shape, small size.
- Physical Change: Melting the candle wax when exposed to heat.
- Chemical Change: Burning the candle, where the wax reacts with oxygen to produce heat, light, and carbon dioxide.
3. Iron nail: Characteristics - Silver color, cylindrical shape, small size.
- Physical Change: Bending the nail with force.
- Chemical Change: Rusting of the nail when exposed to moisture and oxygen in the air.
4. Ice cube: Characteristics - Transparent color, cuboidal shape, small size.
- Physical Change: Melting the ice cube when exposed to heat.
- Chemical Change: Dissolving the ice cube in water, where the solid water molecules break down into liquid water molecules.
5. Paper: Characteristics - White color, flat shape, medium size.
- Physical Change: Folding the paper into different shapes.
- Chemical Change: Burning the paper, where the cellulose fibers in the paper react with oxygen to produce ash, heat, and carbon dioxide.
It's important to consider the specific characteristics and properties of each item when determining the possible changes they can undergo.
Answer: One idea for one item you could write on SLIME!
Explanation: for an idea for one item, you could do slime for characteristics you could write about the chemical change and of course, since slime sits out, you could write about the physical change for chemical change, you could write about how the chemicals make it smell.