Which of the following is not a sign that a chemical change has occurred?

-Change in energy

-Change in mass

-formation of precipitate

-Change in color

Jenna is playing with her toy cars, which are both the same size. She pushes the red car with a strong push. She pushes the blue car with a weak push. What should Jenna expect to observe?

A scientist spilled a few drops of dilute hydrochloric acid (HCI) on a lab table. For safety purposes, the scientist sprinkled some baking soda (NaHCO3) onto the spill.

The [H3O+] in a cabernet sauvignon wine is 5.9 ' 10-4 M. What is the [-OH] in this wine?

Assuming each solution to be 0.10 M, rank the following aqueous solutions in order of decreasing pH. Rank the solutions from the highest to lowest pH. To rank items as equivalent, overlap them a. N2H2 b. Ba (OH) 2 c. HOCL d. NAOH e. HCL

3. What Why are high-altitude weather balloo inly partially filled when they are launched with flying? OER PS

Is it possible for a balloon with an initial internal pressure equal to 250.0 kPa to naturally expand to four times its initial volume when the temperature remains constant and the atmospheric pressure is 101.3 kPa?

How many atoms of gold (Au) are present in a sample of 2.5 mol Au? A. 1.5 * 1024 atoms Au B. 1.5 * 1023 atoms Au C. 4.2 * 1024 atoms Au D. 4.2 * 1023 atoms Au

what might cause the goldfish population to drop if the temperature moves out of its normal range? Name three things

Why must a chemistry experiments performed in a well ventilated room?

What kind of chemical bond does salt have?