Which of the following is the best example of an isolated system?

A. A bus at a bus station

B. An astronaut in a spaceship

C. A motorcycle in a garage

D. A car on the freeway

Fe + _ H2SO4 _ Fe2 (SO4) 3 + _ H2

A carbon atom with 6 protons, 6 electrons, and 6 neutrons would have a mass number of

Which compound is a base? lemon juice sour milk vinegar soap

Which of these represents a chemical change? A) two compounds combining to form a mixture B) a mixture being separated into two elements C) a compound being separated into two elements D) an element changing state from solid to liquid

A vehicle of known mass accelerates along a straight path. according to newtons second law of motion, what caused this acceleration?

Martha has a large amount of 1.25 M H2SO4 in her lab. She needs 36 grams of H2SO4 for a chemical reaction she wants to perform. How many liters of solution should she use?

A student makes observations when water is added to a blue solution of copper sulfate. The student makes only 1 observation: the solution changes to a lighter shade of blue. Is this an example of a chemical reaction? Explain your reasoning.

When dos the spring tide occur

As ice transforms into steam, Question options: new molecules are formed. the types of atoms are changed. energy is absorbed by the molecules. the mass of the molecules is increased.

Why do chemists consider the periodic table so useful?