Answer:
Explanation: in exothermic reaction heat is released out
In endothermic reaction heat is absorbed
Answer:
Date Significance Soviet Union Mission
August 21, 1957 First intercontinental ballistic missile (ICBM) R-7 Semyorka
October 4, 1957 First artificial satellite First signals from space Sputnik 1
November 3, 1957 First dog in orbit (Laika) Sputnik 2
January 31, 1958 First US satellite, detection of Van Allen radiation belts
Explanation:
Answer:
#2.
Explanation:
Look at the charges. Both are positive, therefore both are cations.
if solvation releases more energy than is consumed during dissolute, the solution formation is favored and the solute is soluble in the solvent.many inter molecular forces can contribute to solvation, including hydrogen bonding, dipole -dipole forces and van der walls forces
A substance can dissolve in another when they have thee same type of intermolecular interaction.
<h3>What is solubility?</h3>
The term solubility of a solute refers to the extent to which a solute dissolve in a solvent. We must know that a substance can dissolve in another when they have thee same type of intermolecular interaction.
Thus;
a) Octane (C8H18) mixes well with CCl4 because they are both non polar substances.
b) Methanol (CH3OH) is mixed with water in all ratios because the both are polar substances.
c) NaBr dissolves very poorly in acetone (CH3 ― CO ― CH3) because acetone is only slightly polar.
Learn more about solubility:brainly.com/question/8591226
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