Which of the following could indicate that a chemical change has taken place?

gas formation

formation of a precipitate

color change

all of the above

How many grams of calcium are required to free 8 grams of hydrogen gas from hydrochloric acid, HCI? Ca + 2HCl → CaCl2 + H2 2 grams

Classify the following materials as solid, liquid, or gas at room temperature: milk, helium, granite, oxygen, steel, and gasoline

What is tihe minimum temperature needed to dissolve 130 grams of KNO3 in 100 grams of water

Why is a xenon atom electrically neutral

All of the following are a source of carbon in the carbon cycle except: Sunlight Sediment Animals Fossil Fuels

Was the relationship among temperature, heat, and thermal energy?

What will most likely happen when a warmer air mass exists above a polar ice sheet? The temperature of the ice sheet will be lowered. Heat will be transferred from the air mass to the ice. The air mass will exert high pressure and rise upwards.

A 2.00 L sample of gas at 35 C is to be heated at constant pressure until it reaches a volume of 5.25 L. To what Kelvin temperature must this sample be heated?

Of the following reactions, which one produces oxygen gas? Fermentation Anaerobic respiration Aerobic respiration Photosynthesis

Describe the electrodes in this iron-copper galvanic cell.