High School

We appreciate your visit to 1 Why do scientists use the scientific method To answer questions about the natural world To figure out how to run experiments To show people. This page offers clear insights and highlights the essential aspects of the topic. Our goal is to provide a helpful and engaging learning experience. Explore the content and find the answers you need!

1. Why do scientists use the scientific method?
- To answer questions about the natural world
- To figure out how to run experiments
- To show people they are smart
- To collect data

Read the following passage and use it to help answer questions 2 and 3:

A student wants to determine the effect of a certain brand of liquid fertilizer on the growth of ivy. Ivy plants of the same length are planted in the same amount of soil in three identical containers. To one container, 5 mL of the fertilizer is added; in the second container, 10 mL of the fertilizer is added; and in the third container, no fertilizer is added. The containers are placed in front of the same window. The length of the ivy is measured every five days, and the observations are recorded in a data table.

2. What was the independent variable in this experiment?
- Soil
- Light
- Fertilizer
- Growth

3. List at least one control variable in the experiment.
- Soil
- Light
- Fertilizer
- Growth

A scientist wants to determine if humidity affects chirping in crickets. She makes this table.

4. What is the independent variable?
- Temperature
- Humidity
- Number of chirps

5. A scientist is testing the efficiency of various microwaves by measuring the temperature of water after being heated at high power for one minute. The temperature measured in this test is an example of:
- Independent variable
- Dependent variable
- Control group

6. Which of the following are abiotic factors? (Check all that apply)
- Elephant
- Tree
- Water
- Grass
- Air
- Bugs
- Soil

7. What are two ways abiotic factors affect biotic factors? (Check all that apply)
- A bird picks food out of an alligator's teeth
- An alligator submerges itself under water to stay cool in the summer
- Water is oxygenated
- An alligator suns itself on the shore to raise its body temperature

8. Which property of water allows water molecules to stick to the sides of a drinking straw?
- High heat capacity
- Strong cohesion
- Strong adhesion
- Good solvent

Use the image below to answer question #9 (Oxygen) on the periodic table.

9. How many protons and neutrons are in a stable oxygen atom?
- 8
- 14
- 12
- 16

10. Which two particles are found in the nucleus of an atom? (Check all that apply)
- Protons
- Ions
- Electrons
- Neutrons

11. What is the difference between an isotope and an ion? (Check all that apply)
- Isotopes are atoms with extra electrons or too few electrons
- Ions are atoms with extra electrons or too few electrons
- Isotopes are atoms with extra neutrons or too few neutrons
- Ions are atoms with extra neutrons or too few neutrons
- Isotopes are radioactive
- Ions are radioactive

12. Biology is the study of living things. Carbon is the element that makes life possible. Why is carbon so special that it is required for life?
- It is a positively charged ion needed in reactions
- It has 4 valence electrons, so it can make 4 strong bonds with other atoms
- It is a polar molecule, which makes it have a high heat capacity
- Because it has 4 valence electrons, it is small and only makes small compounds

13. Covalent bonds are formed when two atoms share electrons. Ionic bonds are formed when one atom steals one or more electrons from another atom, creating positive and negative ions. These ions now "stick together". Using the table below, which column of elements are more likely to form ionic bonds than covalent bonds?
- Orange and yellow
- Red and dark purple
- Orange and blue
- Red and light purple

14. A compound is a molecule built of two or more different elements. How are the properties of the compound related to the properties of the elements that make it?
- The compound has different properties because the bonds cause structural changes of the elements
- The compound has the same properties of the atoms because the properties of elements don't change
- The compound has different properties because the elements stay the same

15. When a chemical reaction occurs, energy is either used up (absorbed) or released (given off). What is the term that describes a reaction in which there is an explosion of heat and light?
- Endothermic
- Exothermic
- Ionic
- Covalent

Answer :

The complete answer is given below:

1. Scientists use the scientific method primarily to answer questions about the natural world. This method involves a systematic approach to conducting experiments, making observations, and drawing conclusions based on evidence gathered from empirical data. It helps researchers establish cause-and-effect relationships, test hypotheses, and refine existing theories.

2. The independent variable in the ivy growth experiment is the fertilizer. It is the variable that is deliberately changed or manipulated by the researcher to observe its effect on the dependent variable, which is the growth of the ivy plants.

3. One control variable in the experiment is the soil. Keeping the soil consistent across all containers ensures that any differences observed in the growth of the ivy plants can be attributed to the varying levels of fertilizer and not to differences in soil composition.

4. In the cricket chirping experiment, the independent variable is humidity. This is the variable that is being manipulated to observe its effect on the number of chirps produced by the crickets.

5. The temperature of water after being heated in the microwave is an example of a dependent variable. It is the variable being measured and observed as a result of changing the independent variable, which in this case is the different microwaves being tested.

6. Abiotic factors are non-living components of an ecosystem. The abiotic factors listed in the options are water, air, and soil.

7. Two ways abiotic factors affect biotic factors are:

- Water is oxygenated, providing oxygen for aquatic organisms.

- An alligator submerges itself underwater to stay cool in the summer, which affects its behavior and physiology.

8. The property of water that allows water molecules to stick to the sides of a drinking straw is strong adhesion. This property arises from the hydrogen bonding between water molecules and the molecules of the drinking straw.

9. The stable oxygen atom has 8 protons and 8 neutrons. Therefore, the total number of protons and neutrons is 16.

10. The two particles found in the nucleus of an atom are protons and neutrons.

11. The difference between an isotope and an ion is:

- Isotopes are atoms with extra neutrons or too few neutrons, while ions are atoms with extra electrons or too few electrons.

12. Carbon is special and essential for life because it has 4 valence electrons, allowing it to form up to four strong covalent bonds with other atoms. This property enables carbon to form the backbone of organic molecules, including complex macromolecules like proteins, carbohydrates, lipids, and nucleic acids, which are essential for life processes.

13. Elements in the red and dark purple column of the table are more likely to form ionic bonds than covalent bonds. Ionic bonds typically form between metals (found on the left side of the table) and nonmetals (found on the right side of the table), and elements in the red and dark purple column consist of metals, making them more likely to form ionic bonds.

14. The properties of a compound are different from the properties of the elements that make it up because the compound undergoes chemical bonding, resulting in new substances with unique properties. The compound's properties depend on the types of atoms involved, their arrangement, and the type of chemical bonds formed between them.

15. A chemical reaction that releases heat and light is termed as exothermic. In an exothermic reaction, energy is released as a byproduct of the reaction, often in the form of heat and light. This type of reaction is commonly observed in combustion reactions, where fuels react with oxygen to produce heat and light energy.

Thanks for taking the time to read 1 Why do scientists use the scientific method To answer questions about the natural world To figure out how to run experiments To show people. We hope the insights shared have been valuable and enhanced your understanding of the topic. Don�t hesitate to browse our website for more informative and engaging content!

Rewritten by : Barada