What evidence indicates that a reaction has occurred? (Select all that apply.)

a. The temperature decreased.

b. A solid brown product formed.

c. The temperature increased.

d. A gas formed.

e. An explosion occurred.

Which description explains the role of activation energy in a chemical reaction? A. It provides useful energy that is released in an exothermic reaction. B. It stops the products from being formed from the intermediate state. C.

Why substance dissolve?

Lithium has 2 stable isotopes Li-6 and Li-7. One of them has an abundance of 92.5% and the other has an abundance of 7.5%. Knowing the atomic mass of lithium is 6.941, which is the more abundant isotope?

If the pOH of vinegar is 9.45, what is its [OH - ]?

Strontium metal is placed in water. write the balanced net ionic equation for the reaction.

What does it mean for a cell to be specialized?

A 7.20 L container holds a mixture of two gases at 29 °C. The partial pressures of gas A and gas B, respectively, are 0.179 atm and 0.749 atm. If 0.

Using activated charcoal to separate heavy metals from water is a process known as scrubbing. True or False

If 119.5 g of iron is mixed with 279.50 g of copper (II) nitrate, what is the limiting reagent for the reaction?

Write and balance the double replacement reaction between barium sulfate and titanium (II) oxide.