Show:
Science
Measurement
Classify Matter
Atomic Structure
Periodic Table
100
What are the steps in the scientific method?
What is observation, research, hypothesis, experiment, data collect and analysis, conclusion, and communication of results.
100
What is the measure that scientists use for mass and weight?
What is Mass is measured in grams, but weight is measured in newtons (or pounds in U.S. customary measurement). Mass is proportional to weight.
100
Define Allotrope. Give me an example of an allotrope.
What is An allotrope is different forms of the same element in the same physical state of matter. For example, carbon, when solid, can be graphite (such as in pencils) or diamonds.
100
Describe an atom and its parts.
What is atom is the fundamental unit of an element. It is composed of protons, neutrons, electrons, and a nucleus. Protons are positive and at the center. Neutrons have no charge and are also in the center of an atom. The nucleus is the center of an atom (made up of protons and neutrons). Electrons are located outside the atom and are negatively charged.
100
Who first created the periodic table and how did he arrange it?
What is Mendeleev. He organized it by increasing atomic weight. Moseley re-organized by increasing atomic number, which is what we have today.
200
Define hypothesis?
What is a hypothesis is an educated guess that may explain the observation. If/then statement.
200
What is the formula for volume? If an object has a length of 2 cm, and width of 3 cm, and height of 6 cm what is the volume?
What is length x width x height. Volume= 36 cm cubed (3).
200
What is the difference between a mixture and a pure substance (such as an element)?
What is A pure substance (such as an element) does not change in composition. A mixture is when two or more substances combine physically. For example, salt water is made up of both salt and water.
200
What is the difference between atomic number and mass number?
What is the atomic number is the number of protons in the atom's nucleus. Mass number is the number of protons plus neutrons in the atoms nucleus.
200
What is the difference between groups and periods on the periodic table?
What is there are 18 groups and they are the vertical columns of the table, whereas there are 7 periods and they are the horizontal rows on the table.
300
What is an independent and a dependent variable?
What is Independent: The variable you are going to change or manipulate (what you are testing). Goes on X-axis on graph Dependent: Responding variable that you observe when the independent variable changes. Goes on Y-Axis of a graph.
300
What is the difference between Kelvin, Celsius, and Fahrenheit. If you have a Celsius temperature of 50 degrees, what is that in Kelvin temperature?
What is Kelvin=to measure absolute zero on the metric scale. Celsius= metric scale for temperature. Fahrenheit, U.S. scale for temperature. 323.15 degrees Kelvin.
300
What is the difference between a binary and ternary compound and give me an example of both?
What is Binary is made up of two elements and ternary is made up of three. Binary= NaCl (or table salt). Ternary=(glucose) C6H12O6.
300
What is an ion and how it it positive or negative? Whats the difference between an anion and a cations?
What is an ion is an atom or molecule that has gained or lost one or more of its outer electrons. If it has gained then it is a negative ion and if it has lost it is a positive ion. An anion is a negatively charged ion and a cation is a positively charged ion.
300
What are the properties of metals and non-metals and where are they located on the table?
What is metals-left side of table, solid at room temperature, shiny, malleable, and ductile. Non-metals are on the right hand side of the table, gases at room temperature, dull and brittle.
400
Define a controlled experiment?
What is A control experiment has one complete run where absolutely nothing changes.
400
It is 75 degrees Fahrenheit outside. What is the temperature in Celsius? Round your answer to the nearest whole temperature.
What is 24 degrees Celsius.
400
What is the difference between a homogeneous mixture and a heterogeneous mixture and give an example of both?
What is a homogeneous mixture is the same throughout and a heterogeneous mixture is a type of mixture in which the make-up is NOT the same throughout. Homogeneous=apple juice. Heterogeneous= sand on a beach or a peanut butter and jelly sandwich.
400
Who named atoms? Whose theory said the core of the atom was the nucleus? Who discovered electron energy levels? Who realized that hydrogen gas was a distinct substance?
What is What is Democritus named atoms and said they were the building blocks that cannot be divided. Rutherford's atomic model claimed atoms were tiny and said the positively charged core was the nucleus. Bohr discovered electron energy levels-electrons with higher energy traveled in the larger, outer orbits, etc. . . Cavendish saw that hydrogen was different than air and showed that burning it produced water.
400
List what you know about sodium. List what you know about potassium
What is Sodium: Atomic number 11 and in group 1. It is abundantly found on earth and in minerals (NaCl). It is silvery metal that tarnishes in air, found pure in nature because of its high reactivity, its soft and malleable, and is essential for humans. Potassium: atomic number 19, is soft silvery metal, has low density (lower than water), reacts with water, essential for health, required for plant growth, and in group 1 on periodic table.
500
What is the main difference between theory and law?
What is theories are not facts, and laws are universally accepted. Example: "Theory" of Evolution Newton's Law of Motion
500
What is the formula for density? If you have a density of 7 g/cm3 and a mass of 56 g, what is your volume?
What is D= mass divided by volume. 8 cm3.
500
What is the difference between a physical and a chemical property and give an example of both?
What is physical is a property of matter that can be observed WITHOUT changing into another substance, but a chemical will change into another substance through toxicity, flammability, or reactivity. Physical property could be a color, size, shape and a chemical would be iron rusting or gasoline burning/may see bubbles or change in color such as rust.
500
Describe as much as you can about hydrogen:
What is: Atomic number 1, is a component of water, lightest and most abundant element in universe, colorless and odorless in gas form, highly flammable, has three isotopes (protium, deuterium, tritium-radio-active and was used in first hydrogen bomb), and fuel for stars.
500
What is similar and what is different about alkali metals and alkaline earth metals?
What is Alkali metals are in group 1 with low melting points and one electron in outer energy level. Alkaline earth are in group 2 with high melting points and two electrons in outer energy level. Both are highly reactive and tend to give away electrons.