3, 1, 5, 4, 3, spontaneous
Answer:
1. How do metals and non-metals react with acids?
Ans : Non metals does not react with acids while metals react with acids and produce hydrogen gas that burns with a 'pop'sound.
2. Write and explain the chemical equation for the reaction of magnesium with sulphuric acid and aluminium with hydrochloric acid.
Magnesium + sulphuric acid = Hydrogen + salt
Mg(s) + H2SO4 (aq) MgSO 4(aq) +H2 (g)
Aluminium + Hydrochloric acid = Hydrogen + Aluminium chloride
2Al(s)+6HCl(aq)→2AlCl3(aq)+3H2(g)
Answer:
3. x 10⁸m/s
Explanation:
Given parameters:
Frequency of wave = 7.8 x 10⁶Hz
Unknown:
Speed of the wave = ?
Solution:
All electromagnetic radiation has a speed of 3. x 10⁸m/s in free space.
No matter the frequency and wavelength, they all have the same speed which is the same as the speed of light.
Answer:
Similarities
1. Fresh water and marine water both are essential parts of the water cycle.
2. They contain the same chemical and the amount of minerals in both the ecosystems is same.
3. Both addresses to the aquatic development.
Dissimilarities
1. Marine water carries much higher amounts of suspended chemicals as related to fresh water.
2. This larger collection of the chemical also increases the quantity of salt in marine water than that of fresh water.
3. Plant and animals existing in these water bodies also differ.
