What is the first step in the scientific method?

What is a hypothesis?

Which of the following is a dependent variable?

What is a control group in an experiment?

What is the purpose of a control variable in an experiment?

Which of the following is an example of a quantitative observation?

What is the purpose of a conclusion in a scientific experiment?

You are conducting an experiment to investigate the effect of different temperatures on the rate of enzyme activity. Which process skill is most critical for designing a controlled experiment?

You are investigating the relationship between plant growth and different types of fertilizer. To ensure accurate results, which step in the scientific method is essential?

You are analyzing the data from an experiment on the effect of light intensity on plant growth. Which step in the scientific method is most relevant for this stage?

You are conducting a survey to collect information about people's opinions on renewable energy sources. Which process skill is primarily involved in this activity?

You are investigating the behavior of a new substance in different chemical reactions. Which process skill is essential for predicting the substance's reactions?

You are presenting your research findings on climate change to a group of scientists. Which process skill involves effectively communicating your research and its implications?

You are conducting an experiment to investigate how the amount of sunlight affects the growth of plants. Which of the following is the independent variable?

You are testing how different types of music affect a person's concentration. What is the dependent variable in this experiment?

You are studying how different amounts of exercise affect heart rate. What is the dependent variable in this experiment?

You are testing how different brands of batteries affect the brightness of a flashlight. What is the dependent variable in this experiment?

You have a solution of vinegar (acetic acid) in water. What type of mixture is this?

You are given a mixture of iron, sulfur, and carbon powder. Which of the following best describes this mixture?

You are given a mixture of saltwater from the ocean. Which of the following best describes this mixture?

You are given a mixture of sand and water. Which of the following methods can be used to separate the components?

You are given a mixture of oil and water. Which method can be used to separate the two components?

A 500 mL pineapple juice was prepared by mixing 75 mL of pineapple puree. 

Identify what is given in the problem.

A solution is made by mixing substance A (10 grams), substance B (5.6 grams), and substance C (100 grams). What is the concentration of substance A in the solution?

You have a solution that contains 15 grams of copper sulfate dissolved in 85 grams of water. What is the percentage by mass of the copper sulfate in the solution?

You have a solution that contains 40 grams of sugar dissolved in 200 grams of water. What is the percentage by mass of the sugar in the solution?

You have a solution with a low concentration of solute. Which of the following statements is true about this solution?

You have a solution that is already saturated at room temperature. What will happen if you increase the pressure?

You are trying to dissolve a gas in a liquid. What should you do to increase solubility?

You have a solution of a solid solute in a liquid solvent. If you want to increase the rate at which the solute dissolves, what should you do?

In a musical instrument, 68 grams of zinc and 132 grams of copper were mixed to produce brass. What is the mass percent of copper in the mixture?

You have a container with a clear liquid. Upon close examination, you find that it contains a mixture of water and alcohol. What type of mixture is this most likely to be?

You have a mixture of black ink and water. What method would you use to separate the components effectively?

You need to separate a mixture of acetone (boiling point: 56°C) and ethanol (boiling point: 78°C). Which technique would be the most appropriate?

Sukang paombong has 8% acid by volume. The vinegar is 150 mL, you pour 50 mL in a container. What is the amount of solute in 50 mL of vinegar?

Sukang paombong has 8% acid by volume. If the vinegar is 150 mL, what is the amount of solute in mL present in the solution?

A 7% white vinegar has a volume of 300 mL solution. How much solute does it contain?

The solubility of lye in water is 130 g in 200g of water at 50℃. Which of the following statements is true?

Which of the following is TRUE about the amount of solute dissolved in an unsaturated solution?

Mixture XY was prepared by mixing 10 mL of substance X and 80 mL of substance Y. Which of the following is TRUE about solution XY?

1. I. X is the solute

2. II. X is the solvent

3. III. Y is the solute

4. IV. Y is the solvent

Won dissolved 150 grams of substance A to 850 mL of substance B to make a solution. If the solvent in 120 mL solution can dissolve 25 grams of solute, what will be the type of solution made?

Won dissolved 150 grams of substance A to 850 mL of substance B to make a solution. How many grams of substance A would be in 120 mL of solution?

Pure water is an example of a homogeneous mixture.

A soda with cubes of ice in a glass is an example of heterogeneous mixture

An unknown mixture is being investigated by students. There are no particles settled at the bottom of the container, scattering of light is also not observed. The mixture is colloid.

Heterogenous mixture is made up of two or more substances that are not evenly spread, sizes vary, and particles are uniformly distributed.

Dental amalgam is made up of mercury in silver. Mercury is the solvent and silver is the solute. 

Denise added 150 grams of sugar in 50 mL of water. The solution she created is diluted.

A 300 mL water can dissolve 60 grams of juice powder. Lara added 38 grams of juice powder in 150 mL of water. She created an unsaturated solution.

The new 20 peso coin consists of Copper (65%), Nickel (10%) and Zinc (25%). This is not an example of a solid solution.

Lower surface area of the solute exposed to the solvent, the faster the dissolution rate. 

The higher the solute, the lower the concentration of a solution.

You are given a sample of sugar (sucrose, C₁₂H₂₂O₁₁). Which of the following best describes the nature of this substance?

Which of the following elements is a metalloid?

You are given an element that is malleable, ductile, and a good conductor of electricity. It is likely to be classified as:

You are given an element that is brittle, lacks luster, and is a poor conductor of heat and electricity. It is likely to be classified as:

You are given an element that is a good semiconductor of electricity. It is likely to be classified as:

You are given an element that has properties intermediate between metals and nonmetals. It is likely to be classified as:

You are given an element that is shiny, conducts electricity, and is typically solid at room temperature. It is likely to be classified as:

You are given an element that has properties similar to sulfur but is found in the same period as oxygen. It is likely to be classified as:

You are given a sample of methane (CH₄). Which of the following best describes the nature of this substance?

You are given a sample of sodium chloride (NaCl). Which of the following best describes the nature of this substance?

You are given a sample of ethanol (C₂H₅OH). Which of the following best describes the nature of this substance?

You are given a sample of ethanol (C₂H₅OH) and a sample of sodium chloride (NaCl). Which of the following statements is true?

You are given a sample of methane (CH₄) and a sample of water (H₂O). Which of the following statements is true?

Table salt or sodium chloride is produced by physically mixing a solid sodium and a liquid chlorine. 

All metals are solids in room temperature

All elements occur naturally in the environment.

The symbol for Boron is Br.

Titanium is a metal, It is shiny, malleable and a good conductor of electricity.

Oxygen, Sulfur, and Selenium exhibit similarities in chemical properties.

Antimony, Tellurium and Iodine are all semimetals.

18K Gold jewelry is made out of 75% gold and 25% other metal elements. It is classified as ________.

How many atoms of hydrogen are needed to form a water molecule?

Elements are strategically arranged in the periodic table based on its properties. Which of the following sets of elements can be found in the same period?

What is the element that can be found in period 5 and part of group 15?

Which among the following is a nonmetal based on their location in the periodic table of elements?

Approximately 96% of your body is made of four elements‒C, H, O and N. Which of the following is true about these four elements?

Listening to the sounds birds make is a science process skill of observing.

“If we put more teaspoons of sugar in the glass, then our drink will be sweeter” is an example of a hypothesis

Recall is a science process skill

A scientist would most likely find a solution to a problem by doing a survey of the most effective solution.

Creating graphs and tables for the data collected in  an experiment may show a pattern from the dependent variable.

Solutions can either be homogeneous or heterogeneous

Solute is the material that is being dissolved in a solvent. 

In 100 ml of 70% rubbing alcohol, 70 ml is water.

The DOH provides us a daily report of the number of COVID-19 cases in the Philippines. Grouping the cases into three‒ (1) Asymptomatic cases; (2) Mild Symptomatic Cases; and (3) Severe Symptomatic Cases. What science process skills does this involve?

Sheila has been working hard all summer on her tomato garden. Recently, she noticed that insects have been eating her tomatoes and tomato plants and she is worried about spraying them with harmful, store-bought pesticides.

Sheila investigated using the scientific method. Which of the following steps involves formulation of the hypothesis?

Which of the following can be separated by manual method?

1. I. Different colored pebbles

2. II. Iron filing and sand

3. III. Gold particles and sediments

4. IV. Rice and water

5. V. Rice and beans