Answer the following question given this paragraph: Summary 3.1 Formula Mass and the Mole Concept The formula mass of a substance is the sum of the average atomic masses of each atom represented in the chemical formula and is expressed in atomic mass units. The formula mass of a covalent compound is also called the molecular mass. A convenient amount unit for expressing very large numbers of atoms or molecules is the mole. Experimental measurements have determined the number of entities composing 1 mole of substance to be 6.022 1023, a quantity called Avogadro's number. The mass in grams of 1 mole of substance is its molar mass. Due to the use of the same reference substance in defining the atomic mass unit and the mole, the formula mass (amu) and molar mass (g/mol) for any substance are numerically equivalent (for example, one H2O molecule weighs approximately18 amu and 1 mole of H2O molecules weighs approximately 18 g). 3.2 Determining Empirical and Molecular Formulas The chemical identity of a substance is defined by the types and relative numbers of atoms composing its fundamental entities (molecules in the case of covalent compounds, ions in the case of ionic compounds). A compound's percent composition provides the mass percentage of each element in the compound, and it is often experimentally determined and used to derive the compound's empirical formula. The empirical formula mass of a covalent compound may be compared to the compound's molecular or molar mass to derive a molecular formula. 3.3 Molarity Solutions are homogeneous mixtures. Many solutions contain one component, called the solvent, in which other components, called solutes, are dissolved. An aqueous solution is one for which the solvent is water. The concentration of a solution is a measure of the relative amount of solute in a given amount of solution. Concentrations may be measured using various units, with one very useful unit being molarity, defined as the number of moles of solute per liter of solution. The solute concentration of a solution may be decreased by adding solvent, a... Q: The formula mass of a covalent compound is also called the what? A:

OPTIONS:
- atomic mass
- ionic mass
- nucleus mass
- molecular mass

Answer: molecular mass

Problem: OPTIONS:
- heart shunts
- renal arteries
- umbilical arteries
- blood shunts
Q: Answer the following question given this paragraph: The five regions of the primitive heart tube develop into recognizable structures in a fully developed heart. The truncus arteriosus will eventually divide and give rise to the ascending aorta and pulmonary trunk. The bulbus cordis develops into the right ventricle. The primitive ventricle forms the left ventricle. The primitive atrium becomes the anterior portions of both the right and left atria, and the two auricles. The sinus venosus develops into the posterior portion of the right atrium, the SA node, and the coronary sinus. As the primitive heart tube elongates, it begins to fold within the pericardium, eventually forming an S shape, which places the chambers and major vessels into an alignment similar to the adult heart. This process occurs between days 23 and 28. The remainder of the heart development pattern includes development of septa and valves, and remodeling of the actual chambers. Partitioning of the atria and ventricles by the interatrial septum, interventricular septum, and atrioventricular septum is complete by the end of the fifth week, although the fetal blood shunts remain until birth or shortly after. The atrioventricular valves form between weeks five and eight, and the semilunar valves form between weeks five and nine. Q: Although much of the heart's basic structure is complete by the end of the fifth week, what fetal structures remain until birth or shortly after? A:
Answer: blood shunts

Problem:OPTIONS:
- special symbols
- chemical symbols
- energy symbols
- nuclear symbols

Answer the following question given this paragraph: Nuclear symbols are used to write nuclear equations for radioactive decay. Let's consider an example. Uranium-238 undergoes alpha decay to become thorium-234. (The numbers following the chemical names refer to the number of protons plus neutrons. ) In this reaction, uranium-238 loses two protons and two neutrons to become the element thorium-234. The reaction can be represented by this nuclear equation:. Q: What are used to write nuclear equations for radioactive decay? A:
****
A: nuclear symbols

Answer the following question given this paragraph: Plant cells have structures that animal cells lack. What important process takes place in plant cells but not in animal cells that might explain their differences?. Q: Plant cells have structures that animal cells? A:
OPTIONS:
- have
- drink
- eat
- lack
lack

Answer the following question given this paragraph: Q: Humans building communities to make survival easier is an example of humans as a species changing their what? A:
OPTIONS:
- climate
- instinctive behavior
- evolution
- environment

Answer: environment

input with options: Answer the following question given this paragraph: 25.5 Dispersion: The Rainbow and Prisms The spreading of white light into its full spectrum of wavelengths is called dispersion. Rainbows are produced by a combination of refraction and reflection and involve the dispersion of sunlight into a continuous distribution of colors. Dispersion produces beautiful rainbows but also causes problems in certain optical systems. Q: What is the spreading of white light into its full spectrum of wavelengths called? A:
OPTIONS:
- condensation
- saturation
- radiate
- dispersion
output:
dispersion