Sarah goes to the beach to conduct an experiment. Her testable question is: “What effect does the time of day have on the temperature of water 10 ft below the surface?” which condition should be kept as constants (controlled variables) in her experiment? -weather
-time of day
-where she collects the water
-the clothes and shoes she wears
-if there is a crab nearby
-Temperature of the water
-Type of thermometer she uses
-What she collects the water in
-Amount of water collected

(Multiple Choice question)

chemical properties are the characteristic of matter which can only be observed by changing the chemical identity of a sample like flammability reactivity and toxicity.

c is the answer because when something is left after something evaporates that shows the chemical change.

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.

you did not give any options thus this is the best answer i can give to you with this little information you have given

> they are both natural and not man made

> they can be tracked and predicted by the right tools

-love shrooms