Quiz Chp 1-2 Flashcards
What is matter?
anything that has mass and takes up space
The study of chemicals that contain carbon is called..
Organic chemisr
A fire company needs to make sure that all of its tires related for use at high temperatures contain at least 3% of a chemical called ‘carbon black’. An ___ chemist would be a good person to test how much carbon black was in each tire.
analytical
You want to grow tomatoes, but you aren’t sure if they will do better in the shade or in the sun. You decide to use the scientific method to find out. You plant half of your seeds in the shade and half of your seeds in full sun. You plant them all in newly-purchased soil so that their soil will be the same. You set them up on a watering system ot receive the same amount of water. After 3 months, you measure how tall your tomato plants are and how many tomatoes are on each plant. There are many more tomatoes on the plants that are in the sun. You conclude that next year you should plant all your seeds in the sun.
In this scenario, the height of the tomato plants and the number of tomatoes is the …
The location of the tomatoes (sun or shade) is the ….
The entire process you used is the ….
dependent variable; independent variable; experiment
You want to grow tomatoes, but you aren’t sure if they will do better in the shade or in the sun. You decide to use the scientific method to find out. You plant half of your seeds in the shade and half of your seeds in full sun. You plant them all in newly-purchased soil so that their soil will be the same. You set them up on a watering system ot receive the same amount of water. After 3 months, you measure how tall your tomato plants are and how many tomatoes are on each plant. There are many more tomatoes on the plants that are in the sun. You conclude that next year you should plant all your seeds in the sun.
Why did you need to grow all of the seeds in the same soil with the same amount of water?
So that this variable of the experiment was controlled, and the outcome of the experiment would not have had the soil and the water as a potential factor for why the results were different.
What is the difference between a physical property and a chemical property?
Chemical properties in substances can only be observed after undergoing a chemical change, while physical properties in substances can be measured or observed without changing the substance’s composition.
You are given a flask filled with an unkown brown liquid. You distill the liquid at 100 C. A clear liquid collects in the receiver flask and a dark liquid remains in the sample flask. The initial brown liquid must have been …
A mixture
You are given a sample of a white solid. You try 99,000 different known chemical reactions to try to break it down into simpler components but are unsuccessful. The white substance is most likely a(n) ..
element or compound.
You are given a sample of a clear liquid. You try to separate the sample into components using 99,000 different means to separate them based on their physical properties. You are unsuccessful. Your best conclusion is that the liquid is probably an element
False; while the inability to be broken down by a physical means of separation indicates that it is probably a pure substance and not a mixture, you still don’t know if it’s a compouind or an element
When you place a given substance in a container it takes the shape of that container, but maintains it’s original volume. The substance is in which state?
liquid
In this state of matter, the particles that make up the matter can drift apart from one another.
gas
Fe2O3 and FeO are both composed of the elements iron and oxygen. Since they both contain the same elements, they have similar chemical and physical properties.
false. Properties are unique to substances not the elements that make them up.
Elements can be bbroken down into protons, neutrons, and electrons. Since they can be broken down, why aren’t elements a type of compound?
ELements are not the only thing that can be broken down into protons, neutrons, and electrons. Protons, neutrons, and electrons make up atoms, which make upe verything. Elements are not a type of compound because there is no chemical process that will break down an element into simpler substances.
Classify the following properties of water as physical or chemical properties:
melts at 0C.
reacts with sodium to form hydrogen gas
more dense than oil
physical property; chemical property;physical property
