Three horseshoes are tossed, and all are ringers on the center pole. is this accuracy or precision?

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?

Which of the following isotopes has the same number of neutrons as phosphorus-31?

What’s the physical properties in calcium chloride