A teacher wants to perform a classroom demonstration that illustrates both chemical and physical changes. Which would be the best demonstration that she could use?

More than 70% of all legislation passed in Washington, DC addresses issues related to science; most of these issues pertain chemistry. True or False

When water is broken down by electrolysis, the products are a. water and carbon dioxide. c. hydrogen gas and oxygen gas. b. hydrogen and oxygen ions. d. oxygen and methane.

According to the Br? nsted-Lowry theory, water A. acts as a base when it accepts a hydrogen ion. B. can be neither an acid nor a base. C. can act as an acid by accepting hydrogen ions. D. can accept but not donate hydrogen ions.

You shake a can of soda and open it, which cause the pressure to decrease. what happens to the volume of the CO2. the soda

An astronaut uses a laboratory balance and weighs an object on earth and again on the moon Which statement below about the weight and mass of the object is true? A) The mass and weight will be identical on the earth and the moon.

Match the substance with its chemical formula. 1. H + hydroxide ion 2. H3O + hydronium ion 3. OH - hydrogen ion

Which of those molecules are polar. Co2, So2, CH2Cl2, PCl3

A chemical spill gets into the soil and effects the plants within a forested ecosystem. explain why the top predators would be most affected by this

If the heat released during condensation goes only to warming the iron block, what is the final temperature (in ∘C∘C) of the iron block? (Assume a constant enthalpy of vaporization for water of 44.0 kJ/molkJ/mol.)

Which of the following is not a disaccharide? A) sucrose B) maltose C) lactose D) amylose E) all of the above are disaccarides