What is the hardness of the water in terms of molarity of caco,? d. 3.89 x 10' m a 3.89x 10' m b. 3.89 m c. 0.020 m what is the hardness of the water in terms of ppm caco,? 18. 3 89 ppm b. 38.9 ppm c. 20 ppm a. 389 ppm

What neutral atom is isoelectronic to mn+4

Which factor is likely to impact the possible number of compounds ?

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?