An electric clock in a classroom will not run if it not plugged into an electric outlet what does the clock get from the electric current from the outlet?

A) batteries

B) chemicals

C) energy

D) time of day

Which element is oxidized in the reaction below? fe (co) 5 (l) + 2hi (g) → fe (co) 4i2 (s) + co (g) + h2 (g) a. c?

In the past all living things were classified as

Which describes the role of oxygen in photosynthesis?

Is burning a chemical reaction or a physical change? Tick one box. chemical change physical change And then, explain why you chose your answer.

What is the definition of enthalpy heat of fusion?

Which of the following experimental observations proved that the idea of matter and mass being evenly distributed in an atom was flawed? A. Less than 1% of the alpha particles went un-deflected through the gold foil. B.

Calculate the energy E of a sample of 3.50 mol of ideal oxygen gas (O2) molecules at a temperature of 310 K. Assume that the molecules are free to rotate and move in three dimensions, but ignore vibrations.

Gasohol is a fuel containing ethanol (c2h6o) that burns in oxygen (o2) to give carbon dioxide and water.

What type of rock does the ocean floor consist of? 1 Igneous basalt rock 2 Igneous granite rock 3 Sedimentary rock 4 Metamorphic rock

Consider the combustion of liquid methanol, ch3oh (l) : ch3oh (l) + 3/2o2 (g) →co2 (g) + 2h2o (l) δh=-726.5kj part a what is the enthalpy change for the reverse reaction?