Question

1. what is the precision of this electronic balance? 5. what are two things you should do before and after you use a balance? 6. mass 7. mass

Explanation:

1. Precision of an electronic balance refers to the smallest increment it can measure. Without specific markings on the given electronic - balance image, we assume a common precision of 0.01 g for many standard laboratory electronic balances.
2. Before using a balance, one should ensure it is level and calibrated. After using, one should clean it and return any weights or accessories to their proper place.
3. The mass reading on the left - hand scale: The main scale shows 100 g and the vernier scale shows approximately 1.6 g, so the mass is 101.6 g. The mass reading on the right - hand scale: The main scale shows 700 g and the vernier scale shows approximately 6.4 g, so the mass is 706.4 g.

Answer:

1. A common precision for such electronic balances is 0.01 g.
2. Before: Ensure it is level and calibrated. After: Clean it and return accessories to their place.
3. Left - hand scale mass: 101.6 g. Right - hand scale mass: 706.4 g.