A chemical reaction gives off 2,100 kJ of heat energy.

About how many calories is it equal to?

(1 calorie=4.18 Joules)

5.0 * 10³ calories

5.0*10^4 calories

5.0*10^5 calories

5.0*10^6 calories

Atmospheric chemists think that Earth's first atmosphere a. was very similar to today's atmosphere. b. contained no oxygen atoms. c. consisted of carbon in the form of carbon monoxide. d. consisted of carbon in the form of carbon dioxide. E.

What is the name for the ocean current that brings warm water from the Gulf of Mexico to Western Europe

Here is the combustion reaction for octane (c8h18), which is a primary component of gasoline. how many moles of co2 are emitted into the atmosphere when 20.6 g of c8h18 is burned?

According to Hund's rule, if three electrons are available to fill a set of p orbitals, how will the electrons be arranged? * A. One electron in each orbital B. Two electrons paired up, one in the second and none in the third C.

What is the difference between 5.0g and 5.0g?

Atom with mass number of 31 and 16 neutrons what is the atomic number

In which medium will a sound wave move more quickly

Which of the following is best revealed by the bohr model? a. electrons are found only within the nucleus of an atom. b. protons orbit the nucleus of an atom in fixed proton shells. c. neutrons orbit the nucleus of an atom in fixed neutron shells. d.

A scientist wants to predict the weather which sphere should he study?

What structural formula represents 4 electrons shared between two atoms A. 0=0 B. S8 C. P4 D. N=N