Q: Electrons are located at fixed distances from the nucleus, what are they called? Read this paragraph and choose the correct option from the provided answers: Electrons are located at fixed distances from the nucleus, called energy levels. You can see the first three energy levels in the Figure below . The diagram also shows the maximum possible number of electrons at each energy level. Choices: - Energy layers - Positive levels - energy concentrations - energy levels A:
energy levels

Q: What kinds of waves are composed of various oscillating electric and magnetic fields? Read this paragraph and choose the correct option from the provided answers: Figure 27.45 illustrates how the component of the electric field parallel to the long molecules is absorbed. An electromagnetic wave is composed of oscillating electric and magnetic fields. The electric field is strong compared with the magnetic field and is more effective in exerting force on charges in the molecules. The most affected charged particles are the electrons in the molecules, since electron masses are small. If the electron is forced to oscillate, it can absorb energy from the EM wave. This reduces the fields in the wave and, hence, reduces its intensity. In long molecules, electrons can more easily oscillate parallel to the molecule than in the perpendicular direction. The electrons are bound to the molecule and are more restricted in their movement perpendicular to the molecule. Thus, the electrons can absorb EM waves that have a component of their electric field parallel to the molecule. The electrons are much less responsive to electric fields perpendicular to the molecule and will allow those fields to pass. Thus the axis of the polarizing filter is perpendicular to the length of the molecule. Choices: - elastic - seismic - tidal - electromagnetic A:
electromagnetic

Q: Q: The rate of decay of carbon-14 does what over time? Read this paragraph and choose the correct option from the provided answers: The rate of decay of carbon-14 is stable over time. Choices: - becomes unstable - increases - decreases - remains stable A:
A: remains stable

Question: Q: Emissions of what gas into the atmosphere from fossil fuel burning have been rising for the past several decades? Read this paragraph and choose the correct option from the provided answers: Carbon dioxide emissions into the atmosphere from fossil fuel burning have been rising for the past several decades. Choices: - sulphur - oxygen - neon - carbon dioxide A:
Answer: carbon dioxide

*Question*
Q: Rounded grains indicate that the minerals eroded from what? Read this paragraph and choose the correct option from the provided answers: Cratonic rocks contain rounded sedimentary grains. Rounded grains indicate that the minerals eroded from an earlier rock. It also means that rivers or seas existed. Choices: - iron - fossils - recent rock - earlier rock A:
**Answer**
earlier rock

(Q).
Q: What is always conserved in chemical reactions? Read this paragraph and choose the correct option from the provided answers: A: All chemical equations must be balanced. This means that there must be the same number of each type of atom on both sides of the arrow. That's because mass is always conserved in chemical reactions. Count the number of hydrogen and oxygen atoms on each side of the arrow. There are two hydrogen atoms in both reactants and products. There are two oxygen atoms in the reactants but only one in the product. Therefore, equation 1 is not balanced. Choices: - energy - bonds - force - mass A:
(A).
mass