When an effervescent tablet is dropped in water, what indicates that a chemical change is occurring?

a. the evolution of a gas

b. the condensation of a gas

c. the melting of a solid

d. the subliming of a solid

What particle determines an atom's identity and never changes?

Saturn's axial tilt is similar to that of the earth. Why does Saturn experience different length of seasons compared to earth?

A 1250 kg car is stopped at a traffic light. A 3550 kg truck moving at 8.33 m/s hits the car from behind If bumpers lock, how fast will the two vehicles move?

After pollination where does a seed grow in a flower? a. the stem b. the stamen c. the petal d. the center of the flower

When an acid reacts with water, the hydroxide ion is formed. True False

An impala is an African antelope capable of a remarkable vertical leap. In one recorded leap, a 45 kg impala went into a deep crouch, pushed straight up for 0.21 s, and reached a height of 2.5 m above the ground.

The metric unit of force is the Newton (N), which is kg∙m/s^2. Convert 10 mg∙cm/s^2 to Newtons. Be careful when working with units. A. 1 x 10^-2 N B. 1 x 10^-5 N C. 1 x 10^-6 N D. 1 x 10^-7 N

Which of the following aspects of the environmental movement addresses the public's right to intervene in environmentally damaging activities on private land?

A mine elevator is supported by a single steel cable 0.0125 m in diameter. The total mass of the elevator cage and occupants is 6450 kg. By how much does the cable stretch when the elevator hangs by 362 m of cable? (Neglect the mass of the cable.

What scientific practice is this? 1) collecting data 2) asking a question 3) providing explanations 4) communicating results