Why do scientists use stirbars in the laboratory?

a. to cool a solution

b. to heat a solution

c. to decrease the surface area of a solute

d. to agitate a solution

0.32 g of a walnut is burned under an aluminum can filled with 58.1 mL of water. The water temperature in the can increases by 3.1 °C. How many calories did the walnut release?

In the lab, you analyze a substance to consist of 52% zinc, 9.6% carbon, and 38.4% oxygen. what is the empirical formula?

A white crystalline salt conducts electricity when it is melted and when it dissolves in water. What type of bond is this? a) ionic b) metallic c) covalent d) network

Select the factor (s) that may be responsible for the ionization energy within a period. The valence electrons are further from the nucleus when moving from left to right.

Sally has collected a sample of dirt from a riverbank and wants to analyze it. Sally wants a magnified view of the dirt to try and see what it is made of. Which piece of equipment should she use?

1. How is pressure affected as depth increases? 2. As the sun heats the surface of the oceans, two layers of water result. What separates the layers? 3. How is temperature affected when? (a) the depth increases (b) the latitude increases 4.

Are nails in a jar with water a chemical change

What is the molarity of a solution composed of 4.73 g of potassium iodide (KI) dissolved in enough water to make 0.169 L of solution? Answer in units of M.

Suppose you were given a substance and asked to determine whether or not it was a plasma. Write the characteristics you would look for to identify the substance.

What is a comet? tell in a short and easy answer