Organic molecules always:

A. contain carbon.

B. contain carbon, hydrogen, and oxygen respectively in a 1:2:1 ratio.

C. are produced by living organisms.

D. dissolve in water.

Within a period, what happens to the atomic radius as the atomic number increases?

As water is cooled from 4º C to 0°C, its density

All substances have characteristic properties. If one of these properties can be observed without changing the identity of the substance, it must be a chemical property. biological property. universal property. physical property.

A 5.00-g sample of aluminum pellets (specific heat capacity = 0.89 j/°c · g) and a 10.00-g sample of iron pellets (specific heat capacity = 0.45 j/°c · g) are heated to 100.0°c. the mixture of hot iron and aluminum is then dropped into 93.

What is the difference between valence and core electrons

Name the feature of the ocean floor shown at A and describe how it's formed.

A certain element consists of two stable isotopes. The first has a mass of 62.9 amu and a percent natural abundance of 69.1 %. The second has a mass of 64.9 amu and a percent natural abundance of 30.9 %. What is the atomic weight of the element?

Nonmetals rarely lose electrons in chemical reactions because?

What is the mass of carbon in 500. g of octane?

Which of the following is true about the relationship between the energy gap (∆E) between the spin states for a 1H nucleus and the strength of the external magnetic field?