Are elements with similar chemical properties found in the same period or group on the periodic table?

A.

period

B.

group

A sample of C3H8 has 8.08 * 1024 H atoms. How many carbon atoms does the sample contain? What is the total mass of the sample?

Which choice is a pair of isomers? a. CH₃CH₂OH and CH₃OCH₂CH₃ b. 1-heptene and 2-methylhexane c. NCCH₃ and CH₃CNCH₃ d. CH₂CH₂CH₂CH₂CH₃ and CH₃CH₂CH₂CH (CH₃) ₂ e. methanol and ethene

In a 200 cm3 container, a certain amount of O2 gas is held with a piston at equilibrium with the external pressure being 1 bar. The temperature of the gas is 298 K. When 2 J of heat is supplied, the gas expands against the constant external pressure.

What is the Celsius temperature of 1 mole of a gas that has an average kinetic energy of 4,290 joules?

What is the standard heat of reaction for the formation of NO2 (g) from NO (g) and O2 (g) ? Write the balanced equation first.

What was the result of the atomic theory?

Explain mitosis and meiosis in your own words.

What device changes mechanical energy into electrical energy? Question 4 options: transformer generator copper wire light switch

Reaction rates are affected by how often the particles collide true false

A 25 N and 5 N force pull to the right. Friction is 10 N. If the object is 5 kg, find the net force and acceleration.