WorksheetsChemistry
Total questions: 50
Worksheet time: 1hrs 29mins
Which of the following is an example of an element?
water (H2O)
sugar (C12H22O11)
bromine gas (Br2)
salt (NaCl)
Consider three different elements A, B, and C. A and B are both non-metals, and C is a metal. How will you classify the substance produced when A and B are chemically combined?
element
compound
homogeneous mixture
heterogeneous mixture
What type of substance is sample A?
Ø Sample A: When you shine a light through this sample, it scatters the light, making the beam visible. It does not settle upon standing but remains uniformly cloudy.
element
compound
solution
colloid
What type of substance is sample C?
Ø Sample C: When you dissolve this sample in water, it forms a clear and homogeneous mixture. However, when you add a few drops of silver nitrate (AgNO3) solution to it, it forms a white solid substance.
element
compound
solution
colloid
What type of substance is sample E?
Ø Sample E: This sample appears as a shiny, metallic solid. When you perform a conductivity test, it conducts electricity well.
element
compound
solution
colloid
Which of the following statements BEST describes a similarity between pure substances and solutions?
Both are heterogeneous mixtures.
Both consist of two or more different substances mixed.
Both can be broken down by physical processes.
Both have a uniform composition throughout the mixture.
Eunice is fond of reading Harry Potter books. She measured the dimensions of the book to be 9.0 inches long, 6.2 inches wide, and 1.7 inches thick. How much volume does this book have?
93 in3
94 in3
95 in3
96 in3
During PE class, the nursing students measure their height in centimeters and mass in grams. What would the nursing students do if their PE teacher asks them to report their mass in pounds? (1 lb = 454 g)
Add it with 454 units.
Subtract it with 454 units.
Multiply it with 454 units.
Divide it with 454 units.
Denisse is conducting an experiment to study the effect of temperature on the solubility of a substance. Which of the following statements is CORRECT?
Solubility decreases with temperature for most solids.
Solubility increases with temperature for most solids.
Solubility of gases in liquids increases with temperature.
Solubility of gases in liquids is not affected by temperature changes.
Before administering an antibiotic, Eloisa mixes the powdered medicine with sterile water and swirls the vial. What action increases the rate of dissolution?
Changing the solvent’s polarity.
Increasing the pressure inside the vial.
Agitating the solution.
Reducing the surface area of the solute.
Brandi drops a solid tablet into a graduated cylinder filled with 50 mL of water. The water level rises to 65 mL. If the tablet’s mass is 30 g, what is its density?
1.5 g/mL
2.0 g/mL
2.5 g/mL
3.0 g/mL
Which of the following is CORRECTLY grouped according to their classification?
oxygen gas, sugar, saltwater
milk, iron, vinegar
carbon dioxide, lotion, salad
steel, air, rubbing alcohol
Kate and Krystal are conducting an experiment to compare the dissolution rates of sugar cubes in water. Kate stirs the water gently, while Krystal vigorously stirs the water. After a few minutes, they observe that the sugar cube in the vigorously stirred water dissolves much faster than the one in gently stirred water. Why does agitation increase the rate of dissolution in this scenario?
Agitation increases the temperature of the solution, leading to faster dissolution.
Agitation breaks down the sugar cube into smaller particles, increasing the surface area available for dissolution.
Agitation reduces the intermolecular forces between the sugar molecules, allowing them to dissolve more easily.
Agitation creates a vortex, pulling the sugar molecules into the solution more rapidly.
When mixing an oil-based drug with a water-based solution, the substances don’t mix well. This demonstrates that ____.
Polar dissolves polar, nonpolar dissolves nonpolar.
Water-based solution only dissolves nonpolar substances.
Increasing temperature can dissolve nonpolar substances.
Stirring will form a stable mixture of oil-based drug and a water-based solution.
A pharmacist is preparing a medication for a patient who has difficulty swallowing solid pills. The pharmacist has two options: to provide the medication in tablet form or as a powder. The pharmacist knows that the powdered form will dissolve faster in the patient's stomach. Why does the powdered form of the medication dissolve faster than the tablet form in the patient's stomach?
Powdered form has a higher temperature, facilitating faster dissolution.
Powdered form has stronger intermolecular forces, promoting quicker dissolution.
Powdered form has a lower density, allowing it to dissolve more rapidly.
Powdered form has smaller particle size, leading to a larger surface area for dissolution.
Shainraya accidentally mixes sand, iron filings, and salt. Which sequence of methods should she use to effectively separate sand, iron filings, and salt from the mixture?
Filtration- Decantation- Evaporation- Add water
Magnet- Add water- Filtration- Evaporation
Magnet - Add water- Decantation- Evaporation
Add water- Filtration- Magnet- Evaporation
A plastic syringe has a mass of 20 g when empty and 68 g when filled with a liquid that has a density of 1.2 g/mL. What is the volume of the liquid?
30 mL
35 mL
40 mL
45 mL
Merry was tasked to identify whether an unknown liquid sample is a colloid, suspension, or solution. Which observation will BEST confirm that it is a colloid?
It forms layers after standing overnight.
It scatters light when a beam passes through.
It has visible particles that settle at the bottom.
It evaporates easily when heated.
A jeweler melts copper and zinc together to make brass. What does this show about the nature of alloys?
They are homogeneous mixtures of metals.
They are compounds because the metals chemically bond.
They are heterogeneous since metals don’t mix completely.
They are formed through chemical decomposition.
A mixture of alcohol and water cannot be separated through filtration. Which separation method should be used instead?
decantation
magnetism
distillation
evaporation
Prince is conducting an experiment to determine the solubility of a salt in water at different temperatures. He adds 50 grams of salt to 100 milliliters of water at 20°C and stirs the mixture until no more salt dissolves. What type of solution was formed?
unsaturated
saturated
supersaturated
concentrated
During sterilization, distilled water is used instead of tap water. Why is distilled water preferred?
It is a pure substance free from impurities.
It contains minerals that aid sterilization.
It is a homogeneous mixture with additives.
It reacts chemically with contaminants.
The patient’s output was 2.4 L in 24 hours. How many mL/hour was the urine flow?
(1 L = 1000 mL)
50 mL/hr
75 mL/hr
100 mL/hr
150 mL/hr
Gwyneth uses hydrogen peroxide (H2O2) to clean a wound. Which statement correctly describes hydrogen peroxide?
It is a mixture of hydrogen and oxygen gases that react upon contact with the wound.
It is a solution because it looks uniform and contains dissolved oxygen.
It is a colloid since bubbles appear when applied to the skin.
It is a compound with fixed chemical composition.
In a hospital laboratory, a urine sample is tested, and the technician uses filtration to remove solid sediments. What does this reveal about the sample?
It contains a suspension of insoluble particles.
It is a pure substance because the solutes and solvents cannot be separated physically.
It is a compound since it contains chemically bonded elements like urea and water.
It is a homogeneous solution because the particles are evenly distributed and cannot be filtered out.
Mark compares two samples of urine: Sample A: 48 g, 45 mL; Sample B: 52 g, 50 mL. Which sample has higher density?
Sample A
Sample B
Both are equal.
Insufficient data
After leaving a bottle of antibiotic on the counter for several hours, Tristan observes particles settling at the bottom. How should the mixture be classified?
solution
colloid
suspension
compound
When preparing oral rehydration solution (ORS), Rhea stirs the mixture to ensure complete dissolution of sugar and salt. What process is being enhanced by stirring?
solvation
crystallization
precipitation
diffusion
Blood plasma contains proteins that scatter light but don't settle. This shows plasma behaves as a _____.
suspension
pure substance
solution
colloid
A medical technologist used a centrifuge on blood and obtained clear plasma at the top and red cells at the bottom. What principle does this separation rely on?
chemical bonding
magnetic attraction
difference in density
difference in solubility
Which situation BEST shows a chemical combination rather than a physical mixture?
burning magnesium ribbon in oxygen
melting nickel, gold and silver together
mixing sand, gravel, and water
stirring milk, tea, and honey
After performing chromatography on ink, several colored spots appeared on the paper. What does this indicate about the ink?
It is a pure substance that changed color due to exposure to the solvent.
It is a compound that chemically decomposed into different pigments.
It is an element that displayed multiple oxidation states.
It is a mixture of several dyes that separated.
In an experiment, iron filings and sulfur powder are heated together until a black solid forms that cannot be separated by a magnet. This shows that _____.
A physical mixture was formed, since both substances retained their individual properties.
A compound was formed through a chemical reaction.
The sulfur evaporated from the mixture, leaving only iron behind.
Magnetism altered the atomic structure of iron, preventing attraction.
Fiona observed that a gold ring and aluminum foil have uniform composition. What classification do they share?
pure substances
mixtures
compounds
suspensions
A bottle of suspension medication must be shaken before use because _____.
Stirring increases the solvent's temperature.
Agitation redistributes undissolved particles evenly.
Solvent polarity changes during shaking.
Crystallization occurs when stationary.
How can incorrect temperature conversion between Fahrenheit and Celsius affect patient care?
It may lead to a misinterpretation of the patient's condition and inappropriate interventions.
It can alter how the thermometer reads future measurements.
It may cause the nurse to record the temperature in the wrong vital signs column.
It can make the patient's body temperature fluctuate during monitoring.
Husmaine prepares a saline solution by dissolving sodium chloride (NaCl) in sterile water. Which BEST describes the resulting mixture?
compound
suspension
heterogeneous mixture
homogeneous mixture
Why does powdered milk dissolve more easily in warm feeding water than in cold water during formula preparation?
Heat raises particle kinetic energy.
Cold water increases solvent solubility.
Warm water decreases solubility of solids.
Temperature has an effect on solubility of liquids.
When the cap of a carbonated drink is left loose on the nurse’s station, it loses its fizz. What scientific principle explains this?
Solids become more soluble at lower pressure.
Gases dissolve better at low temperature.
Liquids expand at low pressure.
Gases dissolve better at high pressure.
During IV preparation, the nurse notices the powdered medication dissolves slowly. Which adjustment would most effectively speed up solubility?
Add more solute to increase concentration.
Cool the solution before adding solute.
Seal the vial to increase pressure.
Use warm water and gently swirl the solution.
While analyzing a patient’s urine sample, Dianne notes that it sinks in the testing solution instead of floating. What does this indicate about the urine’s density compared to the solution?
It has lower density.
Both have equal density.
It has higher density.
It has variable density.
A container holds 100 mL of saline and 100 mL of glucose solution. If the total mass is 212 g, and saline has a density of 1.00 g/mL, what is the glucose solution’s density?
1.06 g/mL
1.10 g/mL
1.12 g/mL
1.15 g/mL
During a lab demo, Gerachel measures 25 mL of alcohol with a mass of 19.75 g. Which BEST describes the liquid’s density?
0.79 g/mL
0.85 g/mL
1.00 g/mL
1.20 g/mL
Dr. Godfred orders 250 mg of a drug, but the available vial is labeled 0.5 g per 5 mL. How many milliliters must the nurse give? (1 g = 1000 mg)
1.5 mL
2.5 mL
2.0 mL
3.0 mL
The order says to infuse 500 mL of saline in 3 hours. How many minutes will it take to infuse 250 mL at the same rate? (1 hr = 60 mins)
60 min
75 min
90 min
120 min
How can converting time units (minutes to hours) affect IV flow rate calculations?
It affects the patient’s position during infusion.
It determines the total medication given.
It changes the type of tubing needed.
It alters the solution’s temperature.
Shawe measures an infant’s head circumference as 40 cm, but Vivien records it as 0.4 m. How should this be interpreted? (1 m = 100 cm)
Both entries are equivalent.
The trainee overestimated by 10×.
The trainee underestimated by 10×.
One used meters instead of centimeters.
While reviewing patient data for medication dosing, Rey encounters a height entry of 5 feet 6 inches. To calculate the correct dosage, the value must be converted to centimeters. What is the equivalent height?
(1 ft = 12 in)
(1 in = 2.54 cm)
173 cm
156 cm
163 cm
168 cm
A blood-pressure cuff tubing measures 75 cm. If Qwyncy orders a replacement listed as 30 inches, will it fit the same?
(1 in = 2.54 cm)
Yes, 30 inches is slightly longer.
No, 30 inches is much shorter.
Yes, 30 inches equals exactly 75 cm.
No, 30 inches equals 90 cm and is too long.
On his way to a medical outreach, Dr. Sim drives 40 km from the hospital. While returning, he finds a shortcut that is 3,500 meters shorter than his original route. How many kilometers did he travel in total?
( 1 km = 1000 m)
76.5 km
77.5 km
79.5 km
80.5 km
