What do elements in the first two columns of the periodic table have in common? A. They have two valence electrons.

B. They tend to lose electrons to gain stability.

C. They react strongly with the alkali metals.

D. hey do not react with halogens.

Which sphere of Earth includes icebergs? atmosphere biosphere cryosphere geosphere C. Cryosphere

If the patient's chest is not inflating doing the breathing test you should check the patient?

Two friends are standing on opposite ends of a canoe that is initially at rest with respect to a frictionless lake. The person in the front throws a very massive ball toward the back, and the person in the back catches it.

Which statement describes how rays behave when they travel through media during reflection and refraction

A 343 kg box is pulled 9.00 m up a 30° frictionless, inclined plane by an external force of 5125 N that acts parallel to the plane. Calculate the work done by the external force. work done by the external force: J Calculate the work done by gravity.

A trained attack octopus can crawl at a velocity of 0.3m/s. If the octopus crawls towards its victim for 30 seconds, what is the change in position (or distance) that the octopus crawled?

Which profession is responsible for a planes design? A) Aerospace engineering B) Aerospace mechanic C) Pilot D) Flight attendant

Distracted driving laws have been put in place due to scientific studies that have shown the dangers associated with wireless technology. DDT. plastics. vaccines.

An electric circuit consists of a variable resistor connected to a source of constant potential difference. If the resistance of the resistor is doubled, the current through the resistor is (1) halved (3) quartered (2) doubled (4) quadrupled

If it takes 20n to move a box, how much power will be needed to move the box a diatance