Which of the following could result from a substance that undergoes a physical change?

a) Its chemical composition is altered.

b) It has an irreversible change.

c) It forms a new substance.

d) Its shape is altered.

What is Exo and Endo thermic reaction

Which of the following statements incorrectly depicts the scientific method? A. Hypotheses are tested through experimentation and will be supported or refuted by the results of the experiment. B.

4. Which of the following statements correctly describe atoms? Select all that apply. A) Atoms have mass, B) Atoms are the basic unit of a chemical element. C) Matter is made of atoms. D) Atoms take up space.

A solution is prepared by mixing 50.0 mL of 0.50 M Cu (NO3) 2 with 50.0 mL of 0.50 M Co (NO3) 2. Sodium hydroxide is added to the mixture.

Limestone originates because of: A. chemical precipitation B. chemical weathering C. physical weathering D. biological processes

Halogens have ... Electron affinity

Observe: Change the Surface area from Minimum to Maximum. You can imagine that a solid reactant has been dissolved in a liquid. How does this change how many Reactant B molecules are exposed to Reactant A?

When placed in a 200-mL square box, a substance has a spherical shape and has a volume of 75 mL When placed in a 200-mL circular tube, the same amount of that same substance has a spherical shape and a 75-mL volume.

What is the example to the word camouflage

Given the reaction 2NaOH + H2SO4 = Na2SO4 + 2H2O, what is the total number of grams of NaOH needed to react completely with 196 grams of H2SO4