What do we call conditions in an experiment that are in the same for all groups

In 2-3 sentences, explain WHY the Elodea cells placed in the salt solution look different than they do in water. Include in your answer: What molecule is diffusing in this situation? What causes the appearance to change in salt?

The number of valence electrons in an atom can often be quickly determined by referencing A. the atomic mass of the element. B. the period number on the periodic table. C. the atomic number of the element. D. the group number on the periodic table.

Greg and Shawn are studying for a physical science test. Greg thinks that the kinetic energy of an object depends on the height and speed of an object, but Shawn thinks it depends on the mass of an object. Who is right and why?

Which of the following substances heats the fastest? steel; C=0.5 Zinc; C=0.4 liquid water; C = 4.18 Aluminum; C=0.9

A washing powder contains sodium hydrogencarbonate

What gas has formed when bubels form when water is boiled?

A physical property can be observed or measured without changing the identity of a substance. Which of these choices describes a physical property? The temperature at which a liquid will boil. The tendency of a substance to explode.

What is the correct order of sediment size from smaller particles to bigger particles?

How do the chemical properties of oxides change from left to right across a period? From top to bottom within a particular group?

A mixture is different from a compound because each substance in a mixture a. retains its own properties. c. forms an ion. b. changes its electric charge. d. changes from a solid to a liquid.