Which of the following is an example of a reaction that you've seen in your everyday life?

a. Fire Burning

b. Water Freezing

c. Salt Dissolving

d. Ice Melting

If a pork roast must absorb 1700kJ to fully cook, and if only 11% of the heat produced by the barbeque is actually absorbed by the roast, what mass of CO 2 is emitted into the atmosphere during the grilling of the pork roast?

What is true of the bottom layer of the ocean? Select the two correct answers. A. It has the largest plants. B. It has the lowest salinity. C. It has the greatest density. D. It has the coldest water. E. It has the most sunlight.

What was one important discovery that the Curies made? A material's radioactivity cannot be changed by altering the material physically. A material's radioactivity can be weakened or intensified by changing it chemically.

Which of these is NOT a benefit of nuclear energy? A) fossils fuels are not required B) does not contribute to global warming C) presence of hazardous radioactive materials D) little carbon emissions released into the air

Which statement best explains the octet rule?

How do you know if the reaction is exothermic or endothermic if both phase are same?

How many elements are in a set whole numbers between 3 and 15

Calculate the percent activity of the radioactive isotope strontium-89 remaining after 5 half-lives.

Describe 2 theories for yawning

When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the iron strip. the reason for this is?