Evidence of Chemical Reactions (8.5E) A group of students combined different substances together during several
experiments. Their observations are recorded on the chart below.
Experiment
Observations
A blue liquid and a yellow liquid were
1
mixed and it turned green.
A solid substance dissolved in a clear
2.
liquid.
3
Two room temperature liquids were mixed
and the temperature increased.
Two different liquids were mixed and
4
began to separate and layer in a beaker.
In which experiment did a chemical reaction likely occur?
A 1
B 2
с 3
D 4
Kestor Science and the Science Duo

The image compares the arrangement of electrons in two different neutral atoms. a figure labeled atom q has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has six black spheres. to the left of this figure is another figure labeled atom p. atom p has a shaded sphere at the center of three concentric circles. the innermost circle has two black spheres. the middle circle has seven black spheres. which of the following best explains the position of the two atoms in the periodic table? atom p has an estimated zeff of 7 and is therefore to the left of atom q, which has a zeff of 6. atom p has an estimated zeff of 7 and is therefore to the right of atom q, which has a zeff of 6. atom p has an estimated zeff of 5 and is therefore below atom q, which has a zeff of 4. atom p has an estimated zeff of 5 and is therefore above atom q, which has a zeff of 4.