Which of these chemical formulas represents both an element and a molecule?

NaCl

O2

He

SO2

What color does blue litmus paper turn in an acid base and neutral solution?

if you take 2.0mL of a 7.0 ppm NaOH solution and dilute it to 250.0mL, calculate the final concentration in ppm.

Which factors are most likely to limit population growth in cloud forests? High temperature and excessive moisture Low temperature and high rainfall Excessive moisture and lack of sunlight Lack of moisture and excessive sunlight

For a particular isomer of C 8 H 18, the combustion reaction produces 5099.5 kJ of heat per mole of C 8 H 18 (g) consumed, under standard conditions. C 8 H 18 (g) + 25 2 O 2 (g) ⟶ 8 CO 2 (g) + 9 H 2 O (g) Δ H ∘ rxn = - 5099.

According to the ph scale, what is the approximate ph of acid rain? a. 4.0 b. 4.5 c. 5.0 d. 5.5

An ideal gas will occupy 22.4 L at standard temperature and pressure. What is this volume in cubic centimeters? - cm3

When placed in a freezer, liquid water turns into ice. What best describes this change?

Which of the following has only one loop for a current to flow through A) parallel B) series

What are three steps scientist take to evaluate a scientific explanation

What is the Definition of ionic? (It is a science term)