Question

15 elección múltiple 1 punto what happens at the particle level when pressure increases? the particles spread apart. the particles have more frequent or forceful collisions. the particles move faster. the particles get larger. 16 elección múltiple 1 punto which phase of matter has particles that vibrate in fixed positions? gas solid liquid 17 elección múltiple 1 punto which of these is an element? shaving cream steel milk iron

Explanation:

1. When pressure increases, the particles get closer together rather than spread apart, move slower instead of faster, and don't get larger. In solids, particles have more frequent or forceful collisions compared to liquids and gases under increased pressure.
2. In the solid - phase of matter, particles vibrate in fixed positions. Liquids have more freedom of movement and gases have the most freedom.
3. An element is a pure substance made of only one type of atom. Iron is an element. Milk is a mixture, steel is an alloy (a mixture), and shaving cream is a foam (a type of colloid - a mixture).

Answer:

1. The particles have more frequent or forceful collisions.
2. Solid
3. iron