In an experimental investigation, the group that is not manipulated by the researcher and is then compared to the experimental group is called the group.

Control

Explanation:

In any experiment there is an experimental group and a control group. Experimental group is the main focus of our experiment. The independent variable is changed here and the effect is checked on dependent variable.

Control group's independent variable is either kept constant or controlled. The main purpose of control group is to rule out other factors except the dependent variable which might have an effect on the experiment's result. After the experiment is completed, experimental and control group's results are compared to each other.

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.