1.
All matter (solids, liquids and gasses) are made of these units?
Correct Answer
C. Atoms
Explanation
Atoms are the fundamental units of matter, consisting of protons, neutrons, and electrons. They are the building blocks of all substances, including solids, liquids, and gases. Lego blocks are not the basic units of matter, but rather objects made from matter. Cells are the basic units of life, not matter itself. Water is a compound made up of atoms, but it is not the fundamental unit of all matter. Therefore, atoms are the correct answer.
2.
What are the negative parts of an atom called?
Correct Answer
C. Electrons
Explanation
Electrons are the negatively charged particles found in an atom. They are located in energy levels surrounding the nucleus. Electrons play a crucial role in chemical reactions and bonding between atoms. They are responsible for the electrical conductivity and the formation of chemical compounds. Unlike protons and neutrons, electrons have a much smaller mass and are constantly in motion around the nucleus.
3.
What are the positive parts of an atom called?
Correct Answer
A. Protons
Explanation
Protons are the positively charged particles found in the nucleus of an atom. They are one of the three main subatomic particles, along with neutrons and electrons. Protons play a crucial role in determining the identity and properties of an atom, as they determine the atomic number and contribute to the overall positive charge of the atom.
4.
Where are electrons found?
Correct Answer
D. Outside the nucleus
Explanation
Electrons are found outside the nucleus. They orbit around the nucleus in specific energy levels or shells. This is based on the Bohr model of the atom. Electrons are negatively charged particles and they are attracted to the positively charged protons in the nucleus. However, they do not exist within the nucleus itself.
5.
How can atoms acquire a charge?
Correct Answer
A. By gaining or losing electrons
Explanation
Atoms can acquire a charge by gaining or losing electrons. Electrons are negatively charged particles that orbit the nucleus of an atom. When an atom gains or loses electrons, it becomes either negatively or positively charged, respectively. This process is known as ionization. The number of protons and neutrons in an atom remains constant during this process, as they are located in the nucleus and do not participate in the acquisition of a charge. Therefore, the correct answer is that atoms can acquire a charge by gaining or losing electrons.
6.
What is the name of the center of the atom?
Correct Answer
D. Nucleus
Explanation
The correct answer is nucleus. The nucleus is the center of an atom, containing protons and neutrons. It is surrounded by electrons in the electron cloud. The nucleus is responsible for the mass of the atom and determines its chemical properties.
7.
What do you call an atom that has an electrical charge?
Correct Answer
A. Ion
Explanation
An atom that has an electrical charge is called an ion. Ions are formed when atoms gain or lose electrons, resulting in a positive or negative charge. This charge imbalance allows ions to easily interact with other ions or molecules, making them important in various chemical reactions and biological processes.
8.
A negatively charged object will be attracted to ....
Correct Answer
D. Both B and C are correct
Explanation
A negatively charged object will be attracted to a positively charged object because opposite charges attract each other. Additionally, a negatively charged object can also be attracted to a neutral object because the neutral object may have an uneven distribution of charge, causing a temporary separation of positive and negative charges within the object, creating an attractive force with the negatively charged object.
9.
How can you see an atom?
Correct Answer
D. You cannot see an atom
Explanation
Atoms are the basic building blocks of matter and are incredibly small, with a diameter of about one ten-billionth of a meter. This is much smaller than the wavelength of visible light, making it impossible to directly observe atoms using optical instruments like magnifying glasses, microscopes, or telescopes. Instead, scientists use advanced techniques such as scanning tunneling microscopy or transmission electron microscopy to indirectly visualize atoms. These techniques rely on the interaction of atoms with electrons or other particles to create an image, allowing us to study their structure and behavior.
10.
An atom of carbon and an atom of gold are ....
Correct Answer
B. Different
Explanation
An atom of carbon and an atom of gold are different because they have different numbers of protons, neutrons, and electrons. Carbon has 6 protons, gold has 79 protons. Carbon has 6 neutrons, gold has 118 neutrons. Carbon has 6 electrons, gold has 79 electrons. Therefore, the atomic structure and properties of carbon and gold are distinct, making them different elements.
11.
What is static electricity?
Correct Answer
D. The buildup of electric charges on a material
Explanation
Static electricity refers to the accumulation of electric charges on a material. When certain materials are rubbed together, electrons are transferred from one material to another, causing an imbalance of positive and negative charges. This buildup of electric charges creates static electricity.
12.
What can static electricity cause?
Correct Answer
B. Sparks, shocks and lightning
Explanation
Static electricity can cause sparks, shocks, and lightning. When there is an accumulation of static charges on an object, it can discharge suddenly, resulting in sparks. These sparks can occur when two objects with different charges come into contact or when there is friction between certain materials. Shocks can also be experienced when a person comes into contact with a highly charged object. In certain conditions, such as during thunderstorms, static electricity can lead to the formation of lightning, which is a powerful discharge of electricity between the ground and the atmosphere.
13.
Which conditions support the formation of static electricity?
Correct Answer
B. Dry air with low humidity
Explanation
Dry air with low humidity supports the formation of static electricity. Static electricity is generated when there is a buildup of electric charge on the surface of an object. In dry air, there is less moisture, which means that there are fewer water molecules to conduct electricity. This allows for the accumulation of electric charge on objects, leading to the formation of static electricity.
14.
What is lightning?
Correct Answer
C. Electrons moving between a cloud and the ground
Explanation
Lightning is the discharge of electricity that occurs between a cloud and the ground. During a thunderstorm, the upper part of the cloud becomes positively charged while the lower part becomes negatively charged. This causes a flow of electrons, which are negatively charged particles, to move from the cloud towards the ground. This movement of electrons creates a visible flash of light and the accompanying thunder.
15.
Who is pictured below?
Correct Answer
D. Benjamin Franklin
Explanation
The question asks for the identity of the person pictured below. The correct answer is Benjamin Franklin.