Isotopes have similar chemical properties
Which of the following
statements correctly describe
atoms and elements? Select all
that apply
A The term atom is another
word for element
& An element cannot be
divided into similar substances
C. An atom can be divided into
smaller particles that exhibit
properties identical to those of
the original atom
An atom is considered a
baste building block of matter

To my knowledge, it should be the last 2

Explanation:

1. Incorrect as atoms make up elements when they all have the same properties

2. Incorrect, an element can have other similar elements, they're ordered like that in the periodic table

3. Correct as atoms are made up of mostly space, with mass concentrated at the center of the atom, the nucleus and a few tiny electrons in orbit as proved by Rutherfords alpha particle scattering experiment

4. Correct, Atoms are known as the building blocks of matter

the molecules move in straight line until they collide with each other or with the walls of the container. collisions are perfectly elastic; when two molecules collide, they change their directions and kinetic energies, but the total kinetic energy is conserved.

explanation:

first let us lay out the formula for potential

and kinetic energy:

pe = mgh

ke = (mv^2)/2

where: m=mass, v=velocity, g=gravitational

acceleration, h=height

calculating for mass using the known values of

pe:

340j = m (9.81 m/s^2) (50ft) (1m/3.28ft)

m = 2.27 kg

the law of conservation of energy states that

energy is neither created nor destroyed. therefore, the change in kinetic

energy from 50 ft to 35 ft would be equal to the change in potential energy

from 50 ft to 35 ft. however it would be opposite in signs since one is losing

while other is gaining.

ke(35ft) – ke(50ft) = - [ pe(35ft) – pe(50ft]

ke(50ft) = 0 since the brick is initially at rest

ke(35ft) = 340j - 2.27kg (9.81 m/s^2) (35ft)

(1m/3.28 ft)

ke(35ft)

= 102.38 j