There must be effective collisions between the reacting chemical particles in order for the chemical reaction to occur.
Thank you for posting your question here. Below are the answers to the above questions:
1. The colored sesame seeds represent neutrons, and plain sesame seeds represent protons.
<span>2. The two poppy seeds glued to the fiberfill represent electrons. </span>
Answer:
a. Earth casts a shadow on the moon.
Explanation:
Lunar eclipse occurs when Earth comes in between sun and moon. The sunlight falling on moon is blocked by Earth and the shadow of earth falls on moon. This happens on full moon day when sun, earth and moon align in one line.The moon passes through the shadow of earth and appears dark.
Thus, the correct option is a.
The matter that has the same composition and properties throughout is called pure chemical substance. So the answer is substance.
