With easy 8th grade !
all of the following are possible sources of error in a scientific investigation except for

a)adding research resources during an investigation.

b)not controlling all the variables in an experiment.

c)discovering new variables as the experiment proceeds.

d)measuring the materials of an experiment incorrectly.

How is 0.00235 expressed in proper scientific notation? a. 2.35 × 10-3 b. 0.235 × 10-2 c. 2.35 d. 2.35 × 103

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next

Which scenario is most similar to the type of collision that gas particles have according to kinetic molecular theory