1. is iron ore hetero o homogenous mixture2.is powder turning into starch a chemical o physical change? whyis color change chemical o physical change
The sensitivity is prolly set too high. Lower it a lil.
Ham radios can set them off. There's nothing you can do about it. If someone is talking on a ham radio as they drive by your car, or someone in your neighborhood has one, your alarm may go off from time to time all by itself. Learn to live with it.
here's how to tell: a physical change --you can change it back. a chemical change --that's it. it's transformed into something else and it won't ever be the original form again.
Ham radios can set them off. There's nothing you can do about it. If someone is talking on a ham radio as they drive by your car, or someone in your neighborhood has one, your alarm may go off from time to time all by itself. Learn to live with it.
iron ore is usually found mixed with other minerals, therefore heterogenous. 2. not sure 3. color usually involves different types of mater to reflect a different color, therefore chemical
here's how to tell: a physical change --you can change it back. a chemical change --that's it. it's transformed into something else and it won't ever be the original form again.
iron ore is usually found mixed with other minerals, therefore heterogenous. 2. not sure 3. color usually involves different types of mater to reflect a different color, therefore chemical
1. A heterogeneous mixture looks the same throughout to the naked eye, while a homogeneous mixture looks to have different components to the naked eye. Do you think that iron ore, when dug up out of the ground, would look uniform to the eye or not? 2 powder turning into starch doesn't make sense to me. What powder? A permanent colour change is a sign of a chemical change. Why? Because colour is a property of substances, so a colour change suggests a new substance has been formed ie a chemical change.
