Show:
NJ ASK Practice
NJ ASK Practice 2/Word Problems
Word Problems 2
Word Problem 3/Definitions 1
Definitions 2
100
Which of the following correctly compares the elements on the right side of the periodic table with the elements on the left side of the periodic table? A. The elements on the right side are generally denser than the elements on the left side B. The elements on the left side are better conductors of electricity than the elements on the right side C. The elements on the right side are better conductors of thermal energy than the elements on the left side D. The elements on the left side have lower melting points than the elements on the right side
What is B.
100
Which equipment will best separate a mixture of sand and sugar? A. Filter Paper, Water, and beakers B. Magnet and hydrochloric acid C. Graduated cylinder and gram balance D. Microscope, slide and cover slip
What is A. Filter paper, Water, and beakers
100
As fuel is burned in an airplane, it seems to disappear from the tank, suggesting that matter is destroyed during that reaction. Explain why this is not true and describe where the matter goes.
What is this is not true because the Law of Conservation of Matter states that matter is never created or destroyed in any form of a chemical reaction. The matter is not destroyed but it is sent into the air as a gaseous form or the plane may have a tank to catch the gas fuel and remake it into new fuel for the plane when it lands.
100
Examine the following formulas. Identify them LiF N2 Mgl2 Cl2
What is LiF: Lithium Fluoride N2: Nitrogen Mgl2: Magnesium Iodide Cl2: Chlorine
100
Compound
What is a thing that is composed of two or more separate elements; a mixture.
200
Which is a property of Florine (F), a nonmetal? A. It is a good conductor of electricity and heat B. It is a gas at room temperature and pressure C. It can be drawn into wires D. It is shiny
What is B. It is a gas at room temperature and pressure
200
Five molecules of methane contain five carbon atoms and 20 hydrogen. What is the chemical formula of methane? A. CH4 B. C2H16 C. C4H16 D. C5H20
What is A. C H4
200
A molecule of hydrogen peroxide has one more oxygen atom than a molecule of water. What is the chemical formula of hydrogen peroxide? Hint: Water is H2O
What is H2O2 or 2(HO)
200
Proton
What is a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
200
Element
What is each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter. Each element is distinguished by its atomic number, i.e., the number of protons in the nuclei of its atoms.
300
Which element is LEAST likely to combine with another element to form a molecule. A. Chlorine( Cl), a halogen B. Iron (Fe), a metal C. Neon (Ne), a noble gas D. Silicon (Si), a metalloid
What is C. Neon (Ne), a noble gas
300
Dr. Halite combined sodium metal with chlorine gas to make sodium chloride (table salt). The reaction used up all the metal and all of the gas. If Dr. Halite made 116 g of table salt and started with 68 g of chlorine gas, then how many grams of sodium metal did he start with?
What is 48 grams of sodium metal
300
Propane has the chemical formula of C3H8. How many hydrogen and carbon atoms are in a molecule of propane?
What is 8 atoms of hydrogen (H) and 3 atoms of carbon (C)
300
Atomic Number
What is the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
300
Periodic Table
What is a table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure (and hence similar chemical properties) appear in vertical columns.
400
A certain molecule has a ratio of one atom of an element X for every two atoms of a molecule Y. Suppose a sample of element X and element Y react to form exactly 1 kg of XY2, with no reactants left over. Which of the following could be the amounts of X and Y in the reaction? A. 150 g of X, 300 g of Y B. 200 g of X, 800 g of Y C. 300 g of X, 600 g of Y D. 400 g of X, 800 g of Y
What is B. 200 g of X, 800 g of Y
400
Name two other elements other than chlorine(Cl) that are likely to form molecules with sodium(Na).
What is anything on the VII A, including Fluorine, Bromine, Iodine, and Astatine
400
Is ice melting a physical or chemical change? Explain.
What is ice melting is a physical change because you don't have a new substance after the change and ice melting makes water which may be frozen again to be turned back into ice.
400
Metalloid
What is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. They are electrical semiconductors.
400
Reactivity
What is the ability to react with another substance
500
Which of the following is an example of a chemical change? A. A chunk of metal being hammered until it is flat B. A piece of chalk being crushed into powder C. A solid rock melting into magma D. An iron bridge turning reddish brown over the years
What is D. An iron bridge turning reddish brown over the years
500
What four elements have chemical properties most similar to those of fluorine in column VII A?
What is Chlorine, Bromine, Astatine, and Iodine
500
Most first aid kits have chemical-filled packets that, when squeezed, grow very cold. Is the chemical reaction in such a packet endothermic or exothermic? Explain.
What is endothermic because this type of reaction absorbs heat, taking away heat and leaving the cold when you squeeze it.
500
Chemical Change
What is a reaction that ends with a new substance. Examples of chemical changes include combustion
500
Conservation of Matter
What is the law that states matter is neither created in a chemical reaction