Which of these is measured during a scientific investigation?

Test variable (independent variable)

Outcome variable (dependent variable)

Control group

Hypothesis

The mass of one hydrogen atom is 1.67x10^-27 kg. A cylinder contains 3.01x10^23 hydrogen atoms. What is the mass of the hydrogen?

The elements in any blank in periodic table have similar physical and chemical properties

What type of reaction is represented by the following example? H2 (g) + Cl2 (g) - 2HCI (9) AH = - 185 kJ exothermic endothermic

Water obtained from natural resources does not show neutral pH. What is the reason behind this? The neutral nature of water changes due to its ability to dissociate into H + and OH - ions.

Atom+Atom=? Questions A molecule is:

Enzymes are proteins that speed up chemical reactions in the body how do they work A. they increase the surface area of reactants B. they increase the concentration of reactants C. they decrease the concentration of products D. They act as reactants

Atomic number for bromine

A reaction with ΔH = - 13 kJ/mol and ΔS = - 22 J/K·mol, at 2°C, the reaction is: A) spontaneous B) nonspontaneous C) at equilibrium D) impossible to determine reactivity E) none of the above

A sample of an unknown liquid has a volume of 30.0 mL and a mass of 6 g. What is its density? i need this hella quick

You calculate that 391 000 00 0m is the answer to the problem you asked to write your answers in scientific notation which is correct