Question

question 42 not yet answered marked out of 1.00 flag question is the following description a chemical or physical change? rust forming on a car. select one: a. chemical b. physical clear my choice question 43 not yet answered marked out of 1.00 flag question is the following description a chemical or physical change? dissolving salt. select one: a. chemical b. physical clear my choice question 44 not yet answered marked out of 1.00 flag question is the following a heterogeneous mixture, a homogeneous mixture, an element, or a compound? salt water. select one: a. heterogeneous mixture b. homogeneous mixture c. element d. compound

Explanation:

1. Rust formation creates iron oxide, a new substance, which is a chemical change.
2. Dissolving salt only disperses it in water; no new substance forms, so this is a physical change.
3. Salt water has uniformly distributed components with no visible boundaries, making it a homogeneous mixture.

Answer:

1. a. Chemical
2. b. Physical
3. b. Homogeneous mixture