*Question*
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:
**Answer**
mass

*Question*
Q: What are topographic maps that show water depths called? Read this paragraph and choose the correct option from the provided answers: Topographic maps that show water depths are called bathymetric maps . An example of one is pictured below ( Figure below ). Bathymetric maps are made of any water body, including lakes and oceans. On these maps, the contour lines represent depth below the surface. Therefore, high numbers are deeper depths and low numbers are shallow depths. Choices: - solenoid maps - morainic maps - Water Table maps - bathymetric maps A:
**Answer**
bathymetric maps

*Question*
Q: Sodium and chloride ions have equal but what charges? Read this paragraph and choose the correct option from the provided answers: Sodium and chloride ions have equal but opposite charges. Opposite electric charges attract each other, so sodium and chloride ions cling together in a strong ionic bond. You can see this in row 2 of the Figure above . (Brackets separate the ions in the diagram to show that the ions in the compound do not actually share electrons. ) When ionic bonds hold ions together, they form an ionic compound. The compound formed from sodium and chloride ions is named sodium chloride. It is commonly called table salt. You can see an animation of sodium chloride forming at this URL: http://www. visionlearning. com/library/module_viewer. php?mid=55. Choices: - path - positive - simple - opposite A:
**Answer**
opposite

*Question*
Q: What is the difference in voltage across a resistor or other electrical devices called? Read this paragraph and choose the correct option from the provided answers: The name electric current is the name given to the phenomenon that occurs when an electric field moves down a wire at close to the speed of light. Voltage is the electrical energy density that causes the electric current. Resistance is the amount a device in the wire resists the flow of current by converting electrical energy into other forms of energy. A device, the resistor, could be a light bulb, transferring electrical energy into heat and light or an electric motor that converts electric energy into mechanical energy. The difference in Voltage across a resistor or other electrical device is called the voltage drop. Choices: - volt effect - falling voltage - power drop - voltage drop A:
**Answer**
voltage drop