Which element is present in every organic compound?

(1) carbon (3) nitrogen

(2) fluorine (4) oxygen

What do all of the elements in a given horizontal row of the periodic table have in common?

Which element below has smallest atomic radius?

Is the following nuclear equation balanced? 214 82pb 4 2He 210 80 yes or no

What is the wavelength of a wave with a velocity of 50 m/s and a frequency of 5 Hz?

Which has more energy for erosion? A. lake B. fast-moving stream C. slow-moving creek D. rainfall

Plants make their own food. The chemical reaction for this process is shown in the equation below. CO2 + H2O + energy → C6H1206 + O2 What are the products in this chemical reaction? O A. C6H1206 + energy O B. H20 + energy O C. CoH1206+02 O D.

Using ohm's law, explain how voltage changes in relation to current, assuming that resistance remains constant.

An average copper penny minted in the 1960s contained about 3.000 g of copper. how much chalcopyrite had be mined to produce 100 pennies?

Which pack has the greatest change in enthalpy, warm packs (such as hand warmers) or cold packs (such as an ice pack) ?

A gay cylinder what are the variables in gay-lussacs law