Question

1. which of the following items is considered personal protective equipment (ppe)?

a. beaker
b. safety goggles
c. microscope
d. centrifuge

1. how do physical models help in understanding scientific concepts?

a. by simplifying complex data into visual representations
b. by providing computer simulations
c. by using mathematical equations to predict outcomes
d. by offering a hands - on approach to study systems or concepts

1. how do scientists use observations to form hypotheses?

a. by creating random explanations
b. by using observations to make testable predictions
c. by ignoring observations and guessing
d. by only considering quantitative data

1. which of the following is an example of a dependent variable?

a. the height of a plant
b. the type of soil
c. the room temperature
d. the amount of fertilizer used

1. what distinguishes an observation from an inference?

a. observations are guesses based on prior knowledge
b. observations provide direct, unbiased data while inferences interpret that data

Explanation:

1. Personal protective equipment (PPE) is gear worn to minimize exposure to hazards. Safety goggles protect the eyes, making them PPE.
2. Physical models offer a hands - on way to study systems or concepts, allowing for a better understanding of how they work.
3. Scientists use observations to make testable predictions which form hypotheses. This is a fundamental part of the scientific method.
4. A dependent variable is one that is affected by other factors. The height of a plant can be affected by factors like soil type, temperature, and fertilizer, making it a dependent variable.
5. Observations are direct, unbiased data collection, while inferences are interpretations of that data.

Answer:

1. b. Safety goggles
2. d. By offering a hands - on approach to study systems or concepts
3. b. By using observations to make testable predictions
4. a. The height of a plant
5. b. Observations provide direct, unbiased data while inferences interpret that data