PSHS Science Self Check Exercise 1

Direction: Choose the answer and indicate it by darkening the appropriate circle on your answer sheet.

The following are the main steps in a scientific method. Arrange them in the correct order.

1. Experiment
2. Problem
3. Analysis
4. Hypothesis
5. Conclusion

A student conducted an experiment to see the effect of light intensity on the growth of a certain plant. Which could be the independent, dependent, and control variables of his experiment?

Which of the following lists contains substances only?

Which of the following does not show chemical change?

Which of the following is not an example of a phase change?

Which of the following statements is/are true?

At night, if the temperature drops to above freezing point, water vapor in the air condenses on grass and forms _________.

When a substance freezes, its particles

All of the following are physical changes except

If you wanted to separate iron filings from sand, you would use a ________.

Which one of the following is NOT an example of a separation technique?

Which of these substances is a compound?

The diagram below shows a magnet near a pile of particles of iron and sulfur. The magnet attracts the iron, separating it from the mixture.

Based on the diagram, which statement is true?

Sucrose is another name for table sugar. Sucrose is a compound made from the elements carbon, hydrogen, and oxygen. Which statement best describes the properties of sucrose?

Which of the following is a way in which elements and compounds are similar?

A water molecule is made up of one oxygen and two hydrogen atoms. Why water is considered a pure substance?

Some properties are the same in a substance regardless of the amount of the substance. Which of the following properties does not change based on the amount of the substance?

A beaker containing ice and water is placed on a warm hotplate. Will the ice in the beaker undergo a physical or chemical change?

In the science lab, you found two beakers, each containing 200.0 mL of “water.” You concluded that both liquids are water because of their apparent properties. However, upon doing a simple test, only one turned out to be real water. Which one is it?

Melissa and James measured the mass of the same beaker on two different balances. On the data sheet, Melissa wrote the mass to be 0 g, while James wrote 55 g. Assuming that both measurements were correctly reported, how will you explain the difference?

Which SI unit would appropriately measure the size of each measurement (iiv) described in the following paragraph?

The Santos family starts their day with breakfast. The meal of Sofia, the youngest daughter, always includes a glass of milk (i) while Eliza, the eldest, always drinks a glass of orange juice. Mr. Santos prefers bread with coffee, always adding a tablespoon of sugar (ii). Mrs. Santos eats one banana or an apple (iii). Mr. Santos drives his daughters to school in his car, which is just a short distance (iv) from home. After dropping them off, he proceeds to his work.

Liquids X, Y, and Z are placed on a waxed surface.

Which of the liquids is most likely pure water?

Which of the liquids has the least affinity to the waxed surface?

An iron ball has a mass of 38.6 grams. If the density of iron is 7.9 g/cm3, what volume does the iron ball occupy?

Consider this: At room temperature, the mass of Object R is ½ that of Object S, and the mass of Object W is thrice that of R. The three objects have the same volume.

Which of the following statements is TRUE about objects R, S and W?

In the science lab, you found two beakers, each containing 200.0 mL of “water.” You concluded that both liquids are water because of their apparent properties. However, upon doing a simple test, only one turned out to be real water. Which one is it?