Science
This is a testable prediction that can be investigated through experiments.
This is a testable prediction that can be investigated through experiments.
What safety item should you use if chemicals splash into your eyes?
What is an eyewash station?
Which state of matter has particles vibrating in fixed positions?
What is a solid?
What is the formula for density?
What is mass ÷ volume?
Which piece of glassware measures volume most accurately: beaker, flask, or graduated cylinder?
What is a graduated cylinder?
A well-tested explanation of natural phenomena, supported by evidence, is called this.
What is a scientific theory?
What is the first step if you spill a chemical in the lab?
What is alert the teacher?
According to KMT, temperature is directly proportional to this property of particles.
What is kinetic energy?
A block has a mass of 30 g and a volume of 10 mL. What is its density?
What is 3 g/mL?
How many significant figures are in the number 0.00450?
Three.
In the scientific method, this step comes right before conducting an experiment.
What is forming a hypothesis?
Which is NOT appropriate lab attire: safety goggles, closed-toe shoes, long hair tied back, or sandals?
What are sandals?
Why can gases be compressed more easily than solids or liquids?
Because gas particles have large amounts of empty space between them.
Which is an intensive property: density or mass?
What is density?
What is the volume of the liquid in the following image?
4.15 mL
Explain the difference between a hypothesis and a theory using one example.
A hypothesis is a specific prediction (e.g., “If plants get more sunlight, they will grow taller”), while a theory explains why phenomena happen (e.g., the theory of photosynthesis explains how plants convert sunlight into energy).
Why should test tubes never be pointed at yourself or others when heating
Because they can explode or spray hot liquid.
Arrange the following in order of increasing particle motion: liquid, solid, gas.
What is solid → liquid → gas?
A student drops a rock into a graduated cylinder. The water level rises from 25.0 mL to 40.5 mL. If the rock’s mass is 38.0 g, what is its density?
38.0 g ÷ 15.5 mL = 2.45 g/mL
If you multiply 2.34 × 0.0041 (, how many sig figs should your answer have?
Two.
A student tests how the amount of fertilizer affects plant growth. Identify the independent variable and the dependent variable, and explain why.
The independent variable is the amount of fertilizer (because it is what is changed). The dependent variable is the plant growth (because it is what is measured in response).
A student’s shirt catches fire. Explain the proper steps they should take to put it out safely.
Use a fire blanket or safety shower, stop–drop–roll if necessary.
According to the kinetic molecular theory, what happens to particle motion when the temperature of a substance doubles?
The particles move faster because their average kinetic energy increases.
A student measures a mass of 154.2 g for a sample. The volume, measured by displacement, is 12.7 mL. Calculate the density and report with the correct number of significant figures.
154.2 g ÷ 12.7 mL = 12.1 g/mL
Explain the difference between accuracy and precision, and give one example of measurements that are precise but not accurate.
Accuracy = closeness to true value, precision = closeness of repeated trials. Example: 1.01 g, 1.00 g, 1.02 g for a true mass of 2.00 g.