Astronomers have found evidence of how stars and planets form. They believe that the many tiny particles in nebulae accrete. This process starts out very slowly and gradually gets faster and
faster. What causes this to happen?
Write Y for yes next to the sentence(s) that help explain the cause; write N for no next to
those that do not help explain the cause.
Each particle gravitationally pulls on nearby particles.
A mysterious unknown force draws the particles toward each other.
Particles collide and stick together making larger particles.
The natural tendency of particles to increase in gravity makes the process speed up.
Larger particles have more mass and more gravitational attraction.
Dark energy makes the particles move toward each other and stick together.
Mi

Calcium hydride (cah2) reacts with water to form hydrogen gas: cah2(s) + 2h2o(l) → ca(oh)2(aq) + 2h2(g) how many grams of cah2 are needed to generate 45.0 l of h2 gas at a pressure of 0.995 atm and a temperature of 32 °c?

The last few miles of the marathon are the most difficult for heather, her hair plastered to her head, sweat clinging to her arms, and her legs already feeling as if they had nothing left, just dead weight. after grabbing a cup of ice water, she feels the ice cubes smash against her nose as she gulps some cool refreshment and keeps on running. in these last few miles, the breeze kicks up and she finally feels some coolness against her skin. drips of sweat, once clinging to her forehead, now spill down, and heather feels more pain as the sweat flows into her eyes. which of the following is the most likely reason why the ice struck heather’s nose when she took a drink? a) water can function as a solvent. b) water can store large amounts of heat. c) water can moderate temperatures through evaporative cooling. d) the density of water decreases when it freezes. e) water has a cohesive nature. sweat remained on heather’s forehead and arms because of the a) high salt content of sweat b) cohesive nature of water c) ability of water to moderate heat d) high evaporative cooling effect of water e) ability of water to act as a solvent

In which block of the periodic table is uranium (u) found? s blockd blockp blockf block