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WorksheetsSCIENCE 7 REVIEW
Total questions: 44
Worksheet time: 15mins
What do you call the type of model that is either bigger or smaller than the actual object?
scale model
replica
mathematical model
figurine
Which of the following is a limitation of a model?
It is affordable.
It helps people understand ideas and concepts.
Mathematical model
It cannot contain all the details of the object or phenomenon it represents.
Which of the following is true about liquid?
Its particles do not vibrate.
Its particles are very far from each other.
Its particles can take the shape of its container.
Its particles are arranged very close to one another with a little space in between.
Which statement best describes the particle model of matter?
All matter is made up of large, visible particles that are identical.
All matter is made up of tiny particles, and each pure substance has its own kind of particles.
All matter is made up of tiny particles that are always different in every sample.
All matter is made up of particles that cannot move.
Which of the following is an example of the particle model of matter?
Sugar and salt look the same but are made of different types of particles.
Water can exist as solid, liquid, and gas without changing its particles.
Particles in solids can move freely and occupy more space.
All liquids are made of the same type of particles.
Which of the following best describes evaporation?
Evaporation is when liquid particles gain more kinetic energy and becomes gas.
Evaporation is when solid particles gain more kinetic energy and becomes liquid.
Evaporation is the transformation of gas to solid without entering the liquid phase.
Evaporation is the transformation of solid directly to gas without entering the liquid phase.
Which of the following is NOT an example of the melting process?
The conversion of dry ice to vapor
The softening of metals while being forged into kitchenware
The rocks that are turned to magma due to heat of the earth's interior
The conversion of polar ice caps to water that increases coastal levels
Which comes after formulating a hypothesis?
Stating the problem
Stating the conclusion
Communicating the result
Conducting an experiment
What step in scientific investigation does a scientist do when he/she listens to the sounds of thunder?
formulating a hypothesis
drawing conclusions
making observations
testing a hypothesis
Which of the following is a hypothesis?
The sand has dry and gritty texture.
Spoiled food has unpleasant smell.
There are bubbles formed in the spoiled milk.
If you leave a bucket of water uncovered, it will evaporate more quickly
Why do you need to conduct more than one trial of experiment in a scientific investigation?
to draw conclusions fast
to make your observations accurate
to ensure that the results are consistent
to ensure that the experiment is done correctly
What is a systematized body of knowledge that deals with facts?
History
Biology
Science
Physics
What do you call the proposition or explanation made on the basis of observations?
value
opinion
hypothesis
experiment
What should you do in order to test your hypothesis?
research
interview experts
conduct an experiment
read related literature about your hypothesis
Scientific models are based on data gathered from different reliable sources.
True
False
Only sometimes
Only if it's a new model
Which of the following is the first step in a scientific investigation?
Collecting data
Forming a hypothesis
Defining the problem
Conducting an experiment
A student is designing an experiment to test how different types of fertilizer affect plant growth. Evaluate which of the following experimental designs would provide the most reliable results.
Test only one type of fertilizer on one plant.
Test several types of fertilizer but only measure the height of the plants.
Test several types of fertilizer, use multiple plants for each type, and measure height, leaf size, and overall health.
Test several types of fertilizer, but do not include a control group with no fertilizer.
Which differentiates qualitative from quantitative observation?
Qualitative observation involves a number, while quantitative observation involves a unit
Qualitative observation involves a unit, while quantitative observation involves a number
Qualitative observation is descriptive, while quantitative observation involves measurements
Qualitative observation involves measurements, while quantitative observation is descriptive
Which refers to the process by which the characteristics of an object or phenomenon are quantified?
experimentation
measurement
predicting
qualifying
Which differentiates accuracy from precision?
Accuracy refers to the measurement of an object in a group, while precision refers to the measurement of all objects in a group.
Accuracy refers to the measurement of all the objects in a group, while precision refers to the measurement of an object in a group.
Accuracy refers to the closeness of a set of measurements to one another, while precision refers to the closeness of a measured quantity to an actual value.
Accuracy refers to the closeness of a measured quantity to an actual value, while precision refers to the closeness of a set of measurements to one another.
Which of the following is NOT a quantitative observation?
The class has 10 girls and 12 boys.
The weather today is humid and hot.
There are three functional microscopes in the laboratory.
The temperature in the classroom is 26 degrees Celsius.
Which of the following is best to use in organizing qualitative and quantitative data?
bar graph
data table
line graph
pie chart
What is the measure of the amount of matter an object contains?
mass
gravity
weight
density
Which of the following are examples of fundamental quantities in the metric system?
area and volume
density and time
length and mass
volume and mass
Which of the following activities is PROHIBITED in a science laboratory?
Do not taste unknown substances
Make sure to handle glassware with care
Keep flammable liquids near open flames
Add the acid to the water, not the other way around
You need to measure exactly 27 mL of a liquid for an experiment. Which equipment is most appropriate to use?
A beaker
A graduated cylinder
An Erlenmeyer flask
A test tube
What is the first thing you should do if you accidentally break a glass beaker in the lab?
Pick up the pieces immediately and throw them in the trash.
Continue with your experiment, being careful not to step on the glass.
Inform your teacher or lab assistant immediately.
Ask a classmate to help you clean it up.
When heating a test tube over a Bunsen burner, what is the most important safety precaution to take?
Hold the test tube directly with your hand.
Point the test tube towards yourself so you can see the reaction clearly.
Point the test tube away from yourself and others.
Heat the test tube only at the bottom.
Before using an electronic balance (weighing scale), what should you do to ensure accurate measurements?
Wipe the pan with a damp cloth.
Make sure the balance is on a tilted surface.
Calibrate or zero the balance.
Start weighing immediately.
Which of the following statements is NOT true about solute and solvent?
All solutes can dissolve in a solvent.
Solutions may be solids, liquids, or gases.
A general rule they follow is 'like dissolves like.'
Temperature results in an increase in the solubility of a substance.
Which of the following correctly describes solute?
A medium that dissolves
A substance that is being dissolved
A substance that is similar with an oil
A component of solution that is present in bigger amount
Which of the following is true about solubility?
An increase in pressure makes gases less soluble in a solution.
A decrease in pressure makes gases more soluble in a solution.
An increase in temperature makes gases less soluble in a solution.
A decrease in temperature makes gases less soluble in a solution.
How does stirring or agitation speed up the dissolution process?
It heats up the overall mixture.
It cools down the overall mixture.
It increases the mass of the substances.
It increases the chance of contact between the solute and solvent's particles.
Which of these will produce an unsaturated solution?
five tablespoons of cocoa powder mixed with one glass of water
one cup of calamansi extract mixed with half glass of water
one pack of processed tea powder mixed into a glass of water
half teaspoon of iced tea powder mixed with a glass of water
Which of the following is NOT a characteristic of bases?
It is sour.
It is bitter.
It feels soapy on the skin.
It turns red litmus paper to blue.
What is a commonly used indicator in the laboratory that can be used to identify solutions as acids or bases?
bond paper
hydrochloric acid
litmus paper
water and salt
Which of the following household items is most likely an acid?
Baking soda
Soap
Vinegar
Bleach
A student tests a solution with litmus paper, and it remains unchanged (purple). What can they conclude about the solution?
It is an acid.
It is a base.
It is neutral.
It is a strong oxidizer.
Imagine you are creating a cleaning product that is both effective and safe for use around children. Based on your knowledge of acids and bases, design a product that is neither strongly acidic nor strongly basic. What properties would your cleaning product have, and how would you ensure it is safe?
A product with a very low pH to kill all germs.
A product with a very high pH to dissolve all dirt.
A product that changes litmus paper to a strong red or blue.
A product with a neutral pH, using mild ingredients, and clear safety instructions.
How many grams of glucose are in 255 grams of 15.6% by mass glucose solution?
12.6 grams
39.8 grams
46.2 grams
87.1 grams
What is the percent by volume of alcohol from a mixture of 25 milliliter alcohol and 57 milliliter water?
15%
30%
67%
79%
What is the concentration of a solution if 20 grams of salt are dissolved in 100 mL of water?
0.1 g/mL
0.2 g/mL
5 g/mL
2000 g/mL
If you have a 10% sugar solution, what does that mean?
There are 10 grams of water in 100 grams of solution.
There are 10 grams of sugar in 100 grams of solution.
There are 10 grams of sugar in 90 grams of water.
There are 90 grams of sugar in 100 grams of water.
A company wants to create a new sports drink that provides the optimal balance of electrolytes for athletes. Design an experiment to determine the ideal concentration of electrolytes in the drink. What measurements would you take, and how would you analyze the data to support your recommendation?
Only measure the taste and ask athletes for their opinions.
Only measure the amount of electrolytes without considering athlete performance.
Measure the color and smell of the drink.
Measure electrolyte levels, hydration levels, and athlete performance under different concentrations, then analyze the data to find the optimal balance.
