Which of these is indication that a chemical reaction has occurred?

A. Freezing of a substance

B. Melting of a substance

C. Boiling of a substance

D. Formation of a Preciptate

An object has a constant mmass. A constant force on the object produces a constant?

Is cell division a form of reproduction? Explain. Why do you think this?

The ph of body fluids must remain fairly constant for the body to maintain homeostasis.

Why does the evaporation of sweat cool your body on a warm day

A sheet of paper is dropped from shoulder height and allowed to fall to the ground. Does the air resistance slow the paper down? Explain your answer.

What is the mass number of an ion with 107 electrons, 157 neutrons, and a 1 charge?

Which of the following is true about compounds

According to the chart, which substance has the lowest OH' concentration? A) urine lemon juice tomato juice D) black coffee

23 Which term identifies the half-reaction that occurs at the anode of an operating electrochemical cell? (1) oxidation (3) neutralization (2) reduction (4) transmutation

Which of the following is true? A) Gas atoms subjected to electricity emit bright lines of light. B) Gas atoms absorb white and emit a continuous spectrum of light. C) Gas atoms under high pressure emit dark lines against a continuous spectrum.