What is the most obvious sign of a chemical change in this reaction.

a. a gas was produced.

b. the powder mixed with the water.

c. there was a change in temperature. eliminate

d. the powder dissolved in the water.?

A scientist wants to predict the effect of rise of global air temperature on sea level around the world which method a controlled experiment a scientific investigation or a scientific model explain why

How does molarity and molality affect the concentration of a solution explain.

Which statement tells what happens during the rock cycle when rocks undergo great heat and pressure? A. Igneous rock is formed. B. Metamorphic rock is formed. C. Rock is melted. D. Sediments are lithified to form new sedimentary rock.

Need suggestions on where water is naturally found. I have to make an A-Z list and I already have a few but was wondering if anyone could come up with new ideas.

Why is the molecular formula for a disaccharide not double that of a monosaccharide?

Who created the periodic table and in what year?

Why is uranium 235 the most commonly used isotope for nuclear fission in current uses in nuclear power generation?

Based upon the pH scale, a vegetable with a pH of 5.3 would be

How many grams of Cl are in 535 g of CaCl2?

2. An object experiences an acceleration, g, when it is on the surface of a planet of radius R. What will be the acceleration on the object after it has been moved to a distance of 4R from the center of the planet? A) 168 B) 48 C) 1/4 g D) 1/16 g