19) Which if the following is a heterogeneous mixture?

a. Air

b. Steel

d. Soil

Compare the advantages and disadvantages of using nuclear energy.

What is the [OH⁻] (hydroxide concentration) of that same solution? (pH = 4.00)

A scientist is trying to identify an unknown substance. The answer to which of the following questions would give the scientist information about a chemical property of the substance? a. Is it possible to change the shape of the substance? b.

Give the theoretical yield, in moles, of CO2 from the reaction of 4.00 moles of C8H18 with 4.00 moles of O2. 2 C8H18 (l) + 25 O2 ( g. → 16 CO2 ( g. + 18 H2O ( g.

What type of experiment follows ethical standards?

During a nuclear reaction, mass is converted into (1) charge (2) energy (3) isomers (4) volume

The temperature reading of - 14°C corresponds to a Kelvin reading of: -287 K. 287 K. 297.6 K 259 K.

If element X consists of 64.6% of atoms with a mass of 34.0 u, 18.2% of atoms with a mass of 35.0 u, and 17.2% of atoms with a mass of 36.0 u, what is the average atomic mass of element X to the nearest hundredth?

Water has a K, value of 1x 10-13 1x 10-10 1x 10-15 1x 10-14

What evidence do scientists use to explain how the solar system formed? A) All the planets were a result of solar flares from the sun. B) All the planets are made of the same material, mainly helium.