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Gnesinka [82]
3 years ago
13

How do you tell if a reaction is endothermic or exothermic using only the written formula

Chemistry
1 answer:
irina [24]3 years ago
6 0
You know if it's endothermic or exothermic by doing the enthalpy reaction. If the change of temperature is negative then it is exothermic, while positive is endothermic. If you get -22K then its exothermic, but if you get +22 its endothermic.
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you uses 500 mg of sucrose and placed it into 200ml of water what is the concentration of this solution?
Assoli18 [71]
We are given with 500 mg of sucrose dissoved in a 200 ml of water. The concentration of the solid is amount of solute per volume of the solvent. The concnetration can be expressed as 2.5 grams sugar per liter water or 250 mg per 100 ml water. 
3 0
3 years ago
IF YOURE GOOD AT CHEMISTRY PLEASE HELP ILL MARK YOU BRAINLIEST
ratelena [41]

A solute is the substance to be dissolved (sugar). The solvent is the one doing the dissolving (water). The amount of solute that can be dissolved by the solvent is defined as solubility. Water can form a gas f hotnot heated and if you put something cold in the water that has that was formed can be dissolved by that cold substance.

6 0
3 years ago
1. Lanthanides and actinides are kept separately in the modern periodic table. Why?
AleksAgata [21]

Answer:

1.. Lanthanides and actinides are kept separately in the modern periodic table Why?

Lanthanides and actinides are kept separately in the modern periodic table because of following reason:

  • If they are placed in the body of the periodic table, the periodic table will become extremely long and hard to recognize
  • more scientific and technical reason why they chose to keep the lanthanides and actinides away from the rest of the periodic table was to help in the grouping of elements in blocks

Explanation:

2. Differentiate between long period and short period in any two points.

Long period:

  • The 4th and 5th periods of the periodic table are called long periods.
  • The long periods coontain 18 elements in them

short period:

  • The 2nd and 3rd periods of the periodic table are called short periods.
  • The short periods contain 8 elements in them
8 0
3 years ago
How are the particles arranged and how do the particles move in sodium chloride at 900 c
creativ13 [48]

Explanation:

Particles is a gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern....

I hope you got it

3 0
3 years ago
What is the relationship between organ system and organism?
Eduardwww [97]

An organ system is contained inside an organism. Going from largest to smallest it goes organism->organ system-> organ-> tissue-> cell-> atom

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