WorksheetsMIDTERM EXAM DPC
Total questions: 50
Worksheet time: 3hrs 54mins
What is the very first thing you do once you receive any laboratory equipment?
Start Measuring out chemicals
inspect for cracks or damages
Organize/ Sort your equipment
Wash/Disinfect
Name the equipment
A coaster
A wire gauze
A place mat
A heatprof mat
(Select all that apply.) What is wrong in the picture?
I. Smelling a chemical directly
II. Wearing open toed shoes.
III. Wearing ear buds during lab.
IV. Using hands to pick up broken glass.
I
II
III
IV
Nothing is wrong.
The following are some safety rules in a laboratory. Which one is not correct?
Do not eat or drink in the laboratory
Do not report any injury, however small, to the teacher
Do not taste chemicals in the laboratory
Do not run in the laboratory
Ali would like to heat a test-tube containing chemical X over a Bunsen burner. How should Ali carry put the heating?
Holding the test tube with his bare hands
Holding the test tube with a piece of cloth
Holding the test tube using a test tube holder
Holding the test tube with tongs
How CLOSE a measurement or attempt is to the actual value is the definition of ..............
systematic
precision
accuracy
sensitivity
How CONSISTENT our results are regardless of proximity to the actual value is the definition of .......
accuracy
target value
uncertainty
precision
Which of the following shows an accurate but not precise data
What are the concentrated solutions stored in the
laboratory stockroom for use as needed?
phenolphthalein
indicators
stock solution
aliquot
What do you call to the procedure for preparing a less concentrated
solution from a more concentrated one?
quantitative analysis
dilution
redox titration
gravametric analysis
It is defined as the moles of solute in one liter of
a solution.
molality
molarity
mole fraction
mass percent
It pertains to a solution of accurately known
concentration.
aliquot
stock solution
standard solution
measured solution
If I add 25 mL of water to 125 mL of a 0.15 M of sodium hydroxide solution, what will be the concentration of the diluted solution?
0.125 M
0.13 M
0.75 M
15 M
How much 0.050 M hydrochloric acid solution can be made by diluting 250 mL of 10.0 M HCl?
50,000 mL
500 mL
5.0 x 10^4 mL
5,000 mL
How much water would I need to add to 500. mL of a 2.40 M potassium chloride solution to make a 1.00 M solution?
1200 mL
700. mL
208. mL
1.2 x 10^3 mL
If I add water to 100.0 mL of a 0.150 M NaOH solution until the final volume is 150. mL. What will be the molarity of the diluted solution?
0.100 M
100 M
1.0 M
0.1 M
I have 345 mL of a 1.5 sodium chloride solution. If I boil the water until the volume of the solution is 250 mL, what will be the concentration of the solution?
2.07 M
2.1 M
2.070 M
2.10 M
Which answer choice has all lab safety equipment?
fire blanket, desks, first-aid kit, and sun glasses
hair net, fire extinguisher, gas and water shutoff valves
fire blanket, fire extinguisher, first-aid kit, gas and water shutoff valves, lab coat, and goggles
sun screen, bug spray, 12 day water supply, and matches
What is the purpose of statistical analysis in experiments?
To manipulate the independent variable
To increase external validity
To determine significant differences or relationships
To control the dependent variable
Meshya dissolved 0.5g of Compound B in 20 mL of water and poured the solution in a separating funnel. She then added 10 mL of organic solvent, invert and left the mixture to stand for a few minutes. After the extraction, she found out that the distribution coefficient (Kpc) of Compound B between organic solvent / water is 8.33.
Which of the following represents the mass of Compound B that has transferred into the organic solvent?
0.2043 g
0.4023 g
0.2034 g
0.4032 g
The students measured length during a science experiment, they got 12 cm. But the actual measurement was 14.25 cm. What was the percent error?
15.79%
18.75%
2.25%
18%
The process of using various graphical formats to visually represent the relationship between two or more data.
Presentation
Analysis
Interpretation
A closing paragraph that summarizes the main points of your research and is intended for the readers to know why your research should matter to them after they read it.
Introduction
Conclusion
Results
Thesis Statement
The sources you used on your research.
Sources
References
Literature
Results
A remark, statement or comment based on something one has seen, heard or noticed.
Hearsay
Gossip
Observation
Noticed Actions
The density of air at a certain temperature is 1.21 g/L. A large empty box contains 151.2 g of air inside it. Calculate the volume of the box.
0.008 L
125 L
1249 L
12.5 L
What are the two functions of recommendations in a research paper? (You have to choose two answers here.)
To summarize the main ideas and findings
To provide practical and theoretical implications
To address limitations and suggest future research
To identify the areas of concern that the research findings address
What is the purpose of a conclusion in a research paper?
To introduce new information
To summarize the main ideas
To provide recommendations
To present detailed research results
It is a graph that uses symbols to present and compare data. These graphs are often used where there are people who need to understand things, even if they do not read or speak the language.
Bar Graph
Line Graph
Pie Graph
Pictograph
What do you call data that is collected and presented randomly?
Statistical data
Non-statistical data
Tabular data
Raw data
Accuracy means
the measurements are close to each other
the measurement is close to the true value
the measurements are close to each other
the measurements are close to each other and the true value.
A part of the research report that holds the findings of the study and the discussion of each findings.
a. Introduction
b. Review of Related Literature
c. Methodology
d. Results and Discussion
1,0,1,5,6,3,4
12,10,10,10,13,12,11,13,10
5,11,2,12,4,2
The following are measures of central tendency EXCEPT
Mean
Percentile
Median
Mode
What measure of central tendency can be applied to Categorical Data
Mean
Median
Rank
Mode
Which laboratory apparatus would you use to measure 75ml of water accurately?
Which of the following velocity vs. time graphs corresponds to the distance vs. time graph shown?
