Review For Test #1

When a prefix is added to a base unit in the metric system, it modifies the size of the unit. The prefix can either increase or decrease the size of the base unit, making it bigger or smaller. The prefix acts as a multiplier or divisor, indicating a multiple or fraction of the base unit. This allows for easier representation and conversion of measurements within the metric system.

The prefix "c" in the metric system denotes the unit "centi" which means one hundredth or 1/100th. Therefore, when "c" is used as a prefix, it signifies that the value is multiplied by 100.

A line that measures 18 cm is equivalent to 180 mm because there are 10 millimeters in 1 centimeter. Therefore, to convert centimeters to millimeters, we multiply the given measurement by 10. In this case, 18 cm multiplied by 10 equals 180 mm.

The question asks to convert 23.98 hm (hectometers) into millimeters. To do this, we need to multiply the given value by a conversion factor. Since there are 10 decimeters in a meter, 100 meters in a hectometer, and 1000 millimeters in a meter, the conversion factor is 10 * 100 * 1000 = 1,000,000. Multiplying 23.98 hm by the conversion factor gives us 2,398,000 mm.

To convert grams to kilograms, we need to divide the given value by 1000 since there are 1000 grams in a kilogram. Therefore, 72.9 grams is equal to 72.9/1000 = 0.0729 kilograms.

We use meters per second (m/s) or kilometers per hour (km/h) to measure the speed of a bicycle. These units are commonly used to quantify the rate at which an object, in this case, a bicycle, is moving. Meters per second is a standard unit in the International System of Units (SI), while kilometers per hour is a commonly used unit for measuring speed in everyday life. Both units provide a clear measurement of how fast the bicycle is traveling.

Scientists refer to measurements that have good accuracy and good precision as "good data". Accuracy refers to how close a measurement is to the true or accepted value, while precision refers to how close multiple measurements of the same quantity are to each other. When both accuracy and precision are high, scientists consider the measurements to be reliable and of good quality, hence the term "good data".

A model is a representation of an object or system that aids in our understanding of something that is unfamiliar to us. Models can be physical, such as a scale model of a building, or conceptual, such as a mathematical model used to predict weather patterns. By studying and analyzing models, we can gain insights and make predictions about the real-world objects or systems they represent. Models are valuable tools in fields such as science, engineering, and economics, helping us to comprehend complex concepts and phenomena.

In science, a theory is an explanation that combines many hypotheses and observations. It is a well-substantiated explanation that has been repeatedly tested and confirmed through experimentation and observation. Theories are the highest level of scientific understanding and provide a framework for further research and investigation. They are based on a large body of evidence and are widely accepted within the scientific community. Theories can be used to make predictions and guide future scientific endeavors.

When a model consistently predicts the outcomes of various experiments, it provides a basis for constructing a law that summarizes the results and observations of those experiments. A law is a scientific principle or rule that describes how things work in a particular context. It represents a generalization or pattern that has been observed and verified through multiple experiments, allowing scientists to understand and explain the underlying mechanisms or relationships involved.

Measuring the length, width, and height of an object allows us to calculate its volume. Volume is a measurement of the amount of space occupied by an object. By multiplying the length, width, and height, we can determine the total volume of the object.

A scientist would use an electronic scale for an experiment about the mass of objects. An electronic scale is a precise and accurate tool that can measure the weight of objects in grams or kilograms. It provides a digital reading, making it easier for scientists to record and analyze data. Graduated cylinders are used to measure volume, Celsius thermometers measure temperature, and metersticks measure length, so they would not be suitable tools for measuring mass.

The word "concept" refers to an abstract or general idea or notion. In this context, the word "idea" is the closest in meaning to "concept" as it also represents a general or abstract thought. A plan is a specific course of action, a question is an inquiry, and a solution is a resolution to a problem, so they are not as closely related to the meaning of "concept" as the word "idea" is.

Keeping information from previous experiments on the work area should be avoided in the area where an experiment is taking place. This is because having previous experiment information on the work area can lead to confusion, mix-ups, and potential errors. It is important to have a clean and organized work area to ensure accurate and reliable results.

The density of an object is calculated by dividing its mass by its volume. In this case, the mass of the object is 89.5 g and the volume is 75.1 mL. Dividing the mass by the volume gives us a density of 1.19 g/mL.

The density of an object is calculated by dividing its mass by its volume. In this case, the mass of the object is given as 100.8 g and the volume is given as 144 cm3. Dividing the mass by the volume gives us a density of 0.7 g/cm3.

The word "parameter" in the sentence refers to rules, limits, or boundaries. In scientific experiments, scientists include both constant and changing parameters, which means they establish certain rules or limits that define the conditions under which the experiment is conducted. These parameters help ensure that the experiment is conducted in a controlled and consistent manner, allowing for accurate observations and conclusions to be drawn.

The first step you should take if someone is cut with broken glass during an experiment is to make sure you are safe. This means assessing the situation and ensuring that there are no immediate dangers or hazards that could harm you or the injured person further. It is important to prioritize your safety before providing any assistance or first aid to the injured individual.