Ava's best friend has an indoor cat. Ava notices that she sneezes every time that she visits her friend. Ava suspects that she is allergic to cats but is unsure. What is the best thing for Ava to do next?

What letter represents the activation energy for the reaction without/with the enzyme?

Specific Heat of Water = 4.186 J/g°C Specific Heat of Ice = 2.00 J/g°C Molar Heat of Fusion = 6030 J/mol Molar Heat of Vaporization = 40790 J/mol You take an ice cube (mass = 18g) from the freezer (T = - 10ºC) and place it on the table.

Why does pressure change in this way? Select all that apply.

Match the element with its description. Sodium A) Nonreactive gas Silicon B) Has properties of both metals and nonmetals Bromine C) Highly reactive gas Argon D) Malleable, soft, and shiny

At 1 atm of pressure and a temperature of 0 degrees celsius, which phases of H2O can exist? A.) ice only B.) ice and water C.) ice and water vapor D.) water only E.) not enough data to calculate

What is the ability of a substance to be pulled into a wire? A malleability B ductility C conductivity D solubility

When a counterfeit detection pen is used on an authentic bill, what color does it turn? a. Pale blue b. Pale yellow c. Blue-black d. Pale pink

Why are the outer-most electrons the only ones included in the electron dot diagram?

What is the relationship between law of conservation and chemical reaction?

How quickly must non-frozen ready-to-eat foods be consumed? 24 hours . 48 hours . 3 days . 7 days