Science Quiz

Daniel is conducting an experiment in his chemistry class. He needs to identify different atoms in a sample. What is the atomic number used for?

• To change the element

• To identify atoms

• To measure mass

• To determine volume

Answer explanation

The atomic number uniquely identifies an element by indicating the number of protons in its nucleus. This is essential for distinguishing between different atoms, making 'To identify atoms' the correct choice.

Tags

NGSS.MS-PS1-1

In a classroom experiment, what holds the atoms together in the compounds that Aria and Elijah are studying?

• Chemical reactions

• Chemical bonds

• Physical forces

• Magnetic fields

Answer explanation

Atoms in compounds are held together by chemical bonds, which are interactions between the electrons of the atoms. These bonds can be ionic, covalent, or metallic, and are essential for the formation of stable compounds.

Mia and Liam are in a science class learning about chemistry. They discover that when two or more atoms are held together by a chemical bond, it forms a certain structure. What is this structure called?

• Element

• Mixture

• Molecule

• Ion

Answer explanation

When two or more atoms bond together, they form a molecule. An element consists of one type of atom, a mixture contains different substances, and an ion is a charged atom. Therefore, the correct answer is molecule.

Tags

NGSS.MS-PS1-1

Maya is conducting an experiment in her science class. She boils 700 grams of water. How many grams of steam would be produced?

• 500 grams

• 600 grams

• 700 grams

• 800 grams

Answer explanation

When you boil 700 grams of water, it converts entirely into steam. Therefore, the mass of steam produced is equal to the mass of water boiled, which is 700 grams.

Tags

NGSS.MS-PS1-4

Henry and Mia are in a chemistry class. Their teacher shows them a glass of water and asks, "Which of the following is made up of two or more elements chemically bonded?"

• Element

• Compound

• Heterogeneous mixture

• Homogeneous mixture

Answer explanation

A compound is a substance formed when two or more elements are chemically bonded together. In contrast, an element consists of only one type of atom, while mixtures (heterogeneous and homogeneous) do not involve chemical bonding.

Kai and Zoe are having a campfire. According to the law of conservation of mass, what happens to the mass of the log they burn in the campfire?

• It increases

• It decreases

• It remains the same

• It doubles

Answer explanation

According to the law of conservation of mass, mass cannot be created or destroyed in a chemical reaction. When a log is burned, its mass is transformed into gases and ash, but the total mass remains the same.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Zoe is learning about the structure of an atom in her science class. She wonders, where is a proton located in an atom?

• Electron Cloud

• Nucleus

• Energy Level

• Outside the Atom

Answer explanation

A proton is located in the nucleus of an atom, which is the central part that contains protons and neutrons. The electron cloud surrounds the nucleus, while energy levels refer to the regions where electrons can be found.

Kai is conducting an experiment in his science class. He is studying subatomic particles and needs to identify the charge of a neutron. What is the charge of a neutron?

• Positive

• Negative

• Neutral

• Double Positive

Answer explanation

A neutron has no electric charge, making it neutral. This distinguishes it from protons, which are positively charged, and electrons, which are negatively charged.

Emma is learning about subatomic particles in her science class. She wants to know which subatomic particle has a size of 1/1840 amu. Can you help her find out?

• Proton

• Neutron

• Electron

• Nucleus

Answer explanation

The electron is a subatomic particle with a mass of approximately 1/1840 amu, making it much lighter than protons and neutrons, which have masses around 1 amu each. Thus, the correct answer is the electron.

Aria is studying the periodic table in her chemistry class. She wants to know how many protons are in a nitrogen atom. Can you help her find out?

• 5

• 6

• 7

• 8

Answer explanation

Nitrogen has an atomic number of 7, which means it has 7 protons in its nucleus. This is the defining characteristic of nitrogen, distinguishing it from other elements.