In the reaction C7H16 + __O2 → 8H2O + 7CO2, what coefficient should be placed in front of O2 to balance the reaction?

7

8

11

no coefficient is needed

Which parameter is measured directly in a coffee-cup calorimeter? pressure heat of fusion temperature kinetic energy

The element carbon has 3 naturally occurring isotopes. About 99% of Carbon isotopes are C-12, about 1% are C-13, and a tiny amount are C-14. What is the average atomic mass of carbon atoms?

What element has atoms that can form halide ions?

Which of the following is an example of convection? Question 3 options: A hair dryer drying your hair. When a car engine turns hot after being turned on.

the factors that affect gravitational attraction between two objects are 1. force and distance 2. mass and distance 3. weight and distance 4. mass and weight

15 mL of a 0.16 M solution of glucose was diluted until the total volume reached 95 mL. What is the concentration of new solution?

Mendeleev used his arrangement of elements in order of increasing mass and repeated properties to predict the mass and properties of undiscovered elements. true or false

Describe the basic characteristics of each group of elements on the periodic table

When a 0.1 M H2SO4 solution is added to pulverized blackboard chalk, the following reaction takes place. CaCO3 (s) + H2SO4 (aq) - -> CaSO4 (s) + CO2 (g) + H2O (l) At 25°C, the reaction is spontaneous and has: A. negative ΔG' and positive ΔS' B.

What is a example of one natural source of radioactivity