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Chapter 1-3 Chem Test
Terms in this set (73)
Matter is defined as anything that takes up space and has mass.
The steps of the scientific method must be followed in order every time an experiment is carried out.
The sample's color is a qualitative measurement.
Qualitative measurements involve numerical measurements while quantitative measurements record descriptions.
A control is the part of the experiment that the other results will be compared to.
Chemistry is the study of matter and the changes it goes through.
When conducting an experiment, you should only manipulate one variable at a time.
The goal of all experiments is to prove the hypothesis correct.
The conditions of an experiment that do not vary from sample to sample are called controls.
If the temperature of water increases as you heat it, the temperature is the independent variable.
In systematic steps of approach used in a scientific study, a scientific law comes after a hypothesis.
Which is the control in this experiment?
Which is a reasonable hypothesis for this experiment?
If salt is added to water, the water will boil at a higher temperature.
Which is the part of an experiment that serves as the point of comparison for the results?
Which is a qualitative measurement?
Which is a quantitative measurement?
Which is the independent variable in this experiment?
amount of salt added
Which is the dependent variable in this experiment?
Which is a value that should remain constant for all samples in this experiment?
Volume of water
Which of the following is qualitative data?
Which of the following is quantitative data?
Explain how hypothesis and theory are different.
A hypothesis is something that you test in an experiment to prove right or wrong. A theory is backed up by a lot of hypotheses proving that theory.
Infer a qualitative observation that can be made from the scene shown.
A qualitative observation from this scene would be the color of the pencil. The pencil is grey.
Infer a quantitative observation that can be made from the scene shown.
A quantitative observation of this scene would be the size of the pencil. The size of the pencil is about 5.5 inches.
A solid can not be compressed because its particles are tightly packed.
A change in state of matter is a physical change.
When a chemical change occurs, the products have a greater mass than the reactants.
The magnetization of an iron rod is an example of a chemical change.
The change in the color of tree leaves in fall is an example of a physical change.
Compounds can be separated into their component elements by a series of physical changes.
Orange juice is a heterogeneous mixture.
Milk is a homogeneous mixture.
Seawater is a substance.
Matter that has a uniform and unchanging composition is called a pure substance.
The terms gas and vapor can be used interchangeably.
Which is the state of matter that has a definite shape and definite volume?
Which is the state of matter that has an indefinite shape and definite volume?
Which is the state of matter that has an indefinite shape and indefinite volume?
Which is NOT a chemical change?
ingredients for a cake are stirred together
According to the Law of Conservation of Mass, in any chemical change
the mass of reactants is equal to the mass of products
Which is a chemical property of copper?
reacts in air to form a green layer
An 7.20-g sample of aluminum reacts with oxygen to form 15.20 g of aluminum oxide. How many grams of oxygen are used in the reaction?
When sodium chloride reacts with calcium oxide to form sodium oxide plus calcium oxide, which of the following equations best illustrates the Law of Conservation of Mass?
2 NaCl + CaCO --> Na2CO + CaCl2
The Law of Conservation of Mass states that mass is neither created nor destroyed in an ordinary chemical reaction. When an iron nail rusts, it seems to get heavier in mass. Does the iron nail follow the Law of Conservation of Mass?
Yes, iron chemically combines with the oxygen in the air so if you add the oxygen into the mass of the chemicals before the reaction, the mass after the reaction is the same.
Which is the state change in which a solid becomes a liquid?
Which is the state change in which a gas becomes a liquid?
Which is the type of separation technique being demonstrated in the figure?
Which is an example of a homogeneous mixture?
Which is a compound?
A 20.0-gram sample of magnesium oxide contains 16.2 grams of magnesium. What is the percent of oxygen by mass in this compound?
The law of conservation of mass states that during a chemical reaction, total mass is ____.
Which of the following substances is an element?
A chemical composition of two or more different elements joined together in fixed proportions is known as a(n) ____.
A 75.00-g sample of an unknown compound contains 13.60 g of oxygen. What is the percentage by mass of oxygen in the compound?
The figure shows the results of paper chromatography of a mixture of pigments. Based on the results shown, which pigment has the greatest attraction for the paper?
Which is the separation technique that relies on the different boiling points of the parts of the mixture?
Matter that has a uniform and unchanging composition is known as a(n) ____.
A process that involves one or more substances changing into new substances is known as a ____________________ change.
Cutting a sheet of paper is an example of a ____________________ change.
40 g of calcium reacts with 71 g of chlorine to produce _____ g of calcium chloride.
A piece of silver can be hammered into a cloverleaf shape.
A piece of charcoal, which is mostly carbon, glows red, gives off heat, and become gray ash.
Table salt dissolves in water and remains as a crust when water evaporates.
The Statue of Liberty, once the color of a new penny, turned to a blueish-green as it formed a thin coating called a patina.
Wood burns in a fireplace.
A block of pewter is pounded and made into a bowl.
A copper weather vane becomes green in a few years.
Baking soda and cookie dough causes the cookies to puff with bubbles of gas when they are baked.
A pan of water boils on a stove until the pan becomes dry.
Mothballs vaporize in a closed closet.
Soap and water are used to clean up a spill of grease.
What is the percentage by mass of compound 1 if 3.92 g of it reacts with 10.54 g of compound 2 to form a compound of mass 14.46 g? Also, calculate the percentage by mass of compound 2 in the compound.
Compound 1- 27.1% Compound 2- 72.9%
Use your periodic table to determine the percent composition by mass of hydrogen in H2O.
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