Which actions are evidence that a chemical reaction has occurred? Check all that apply.

A: a change in color

B: the formation of a precipitate

C: a clear liquid becoming cloudy

D: a change in shape

E: the formation of bubbles

F: the formation of smoke

Two students are having a discussion about the Moon. The first student claims that we always see only one side of the Moon and that the other side is the "dark side." This student also further asserts that the dark side of the Moon is always dark.

What law of motion corresponds with this statement? a small car is easier to start moving than a large car

How many Oxygen (O) atoms are in the following? H2O + CO2 4 3 2

How much would it cost to cover the entire land area of United States with dollar bills? To answer this question, you may find the following information useful: The contiguous United States (all of the states minus Alaska and Hawaii) can be

What happens to an electromagnetic wave when the frequency is doubled? A. The wavelength doubles. B. The wavelength halves. C. The speed doubles. D. The speed halves.

A 1180kg car is moving at a speed of 85.5 km/h. Find the force needed to bring the car to rest in a distance of 300m

Which best states the author's argument in catching sun rays? no power source is clean, free, and renewable. it costs too much to use solar energy for power. the use of solar energy can cause blackouts in big cities.

A possible means of space flight is to place a perfectly reflectingaluminized sheet into orbit around the Earth and then use the lightfrom the Sun to push this "solar sail." Suppose a sail of area5.

An electric circuit consists of a variable resistor connected to a source of constant potential difference. If the resistance of the resistor is doubled, then

What would happen if an electron was added to an atom