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Test 2
Chapter 11
| Question | Answer |
|---|---|
| Which investigator is credited for discovering Brownian motion? | Robert Brown |
| Who advanced the idea of atoms in the early 1800s? | John Dalton |
| What causes dust particles and tiny grains of soot to move with Brownian motion? | Collisions with invisible molecules |
| Who first explained Brownian motion and made a convincing case for the existence of atoms? | Albert Einstein |
| As the text cites, atoms are incredibly tiny, numerous, perpetually moving, and what else? | Ageless |
| Compare the age of the atoms in your body with the age of the atoms that were part of the dinosaurs. | Both are ageless |
| How does the approximate number of atoms in the air in your lungs compare with the number of breaths of air in Earth's atmosphere? | The numbers are the about the same, 10^23 |
| Are most of the atoms around us younger or older than the Sun? | Most are older than the Sun |
| An important feature of atoms is that they | have wave properties |
| Why can atoms be seen with an electron beam? | The wavelength of the electrons is smaller than an atom. |
| What is the purpose of a model in science? | A model is an abstraction that helps us visualize and predict |
| Which of the following are negatively charged? | Electrons |
| The mass of an atom is___ | concentrated in the atomic nucleus |
| What is the most abundant element in the known universe? | Hydrogen |
| Where did the heaviest elements originate? | Nuclear fusion in supernovae |
| What are the five most common elements in humans? | C, H, O, N, and Ca |
| Which of the following is an element? | Hydrogen |
| The periodic table of the elements is a list of __________ | Atoms |
| Compared to hydrogen (atomic number 1), the helium atom (atomic number 2) has double the positive charge in the nucleus, how do you compare their relative sizes? | Helium atom is smaller than the hydrogen atom |
| What kind of attraction pulls electrons close to the atomic nucleus? | Electric |
| Brownian motion provided some evidence for the existence of atoms because | the jiggling of small dust grains indicated that very small particles (atoms) are colliding with the grains. |
| Nuclei of atoms that make up a newborn baby were manufactured in | ancient stars |
| The difficulty of taking a photograph of an atom with light is | that atoms are smaller than wavelengths of light, unwanted diffraction |
| Which particle has the least mass? | Electron |
| Atomic number refers to the number of | protons in the nucleus. |
| The nucleus of an electrically neutral iron atom contains 26 protons. How many electrons normally surround this nucleus? | 26 |
| Two protons added to an oxygen nucleus result in | neon. |
| The chemical properties of matter are due mostly to their | electrons |
| How many atoms are in this carbohydrate molecule, C 6 H 12 O 6 | 24 |
| If a gram of antimatter meets a kilogram of matter, the amount of mass to survive is | 999 grams |
Created by:
marie112761
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