Questions
Questions
Questions
Questions
NJ Ask Practice
100
Is ice melting a physical or chemical change. Explain?
What is a physical change, because this can be reversed. The ice is still ice, just in a different form.
100
When you eat food a chemical reaction takes place in your stomach. Identify some of the reactants and the products in this reaction.
What is the reactants include food eaten, the saliva in the mouth and stomach acid The products include anything your body produces from chemically altering your food
100
Examine the following chemical formulas. Identify the names of each molecule. Then state whether these molecules are made of a metal and a nonmetal or of two nonmetals. LiF N(2) Mgl(2) Cl(2)
What is Lithium and fluoride- metal and nonmetal Nitrogen atoms- nonmetals Magnesium and 2 iodine atoms- metal and nonmetal Chlorine atoms- nonmetal
100
define atom
What is the smallest particle of an element; the building block of matter
100
Dr. Halite combined sodium metal and chlorine as to make sodium chloride (table salt). The chemical reaction used up all of the metal and all 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?
He started with 48 g of sodium. This is because matter can't be created or destroyed so the amounts would be the same
200
As fuel is burned in an airplane, it seems to disappear from the tank, suggesting that matter is destroyed during the reaction. Explain why this is not true, and describe where the matter goes.
Matter is neither created or destroyed in chemical reaction. The fuel is converted into gas which escaped into the atmosphere.
200
Most first-aid kits have chemical-filled packets that, when squeezed, grow very cold. Is the most chemical reaction in such a packet endothermic or exothermic?
What is exothermic, because it absorbs heat. If you put the pack on your skin it will pull heat energy from your body and feel cold
200
There is a jar with water and glass marbles in it, describe the process to separate it.
What is pour the water through a strainer,
200
define proton
What is a positively charged particle in an atom's nucleus
200
A certain molecule has a ratio of one atom of element X for every two atoms of element Y. Suppose a sample of element x and a sample of element Y react to form exactly 1 kg of XY(2) with no reactants left over. Which of the following could be the amounts of X and Y in the reaction?
What is 200 g of X and 800 g of Y
300
A molecule of hydrogen peroxide has one more oxygen atom than a molecule of water. What is chemical formula of hydrogen peroxide.
What is an element is a substance that cannot be broken down into simpler substances by physical or chemical means
300
Propane has the chemical formula C(3)H(8). How many hydrogen and carbon atoms are in a molecule of propane?
What is 8 hydrogen atoms and 3 carbon atoms
300
A jar contains water, glass marbles, and iron marbles, describe the process to separate it.
What is evaporate the water, use a magnet to get the iron marbles out of the jar.
300
Compares the elements on the right side of the periodic table with the elements on the left?
What is the elements on the left side are better conductors of electricity than the ones on the right side
300
Name an example of a chemical change.
What is an iron bridge turning brownish over the years
400
Use the periodic table to find the name of the element that goes with each symbol. Then, state weather the element is a metal, a metalloid, or a nonmetal for the following... Ag P Li Te I
What is Ag-silver, metal P-nonmetal, phosphorus Li-metal, Lithium Te-metalloid, tellurium I-nonmetal, iodine
400
What four elements have chemical properties most similar to those of Florine in column VII A?
What is chlorine, bromine, iodine, astatine
400
A jar has salt water, iron marbles, and glass marbles, describe the process to separate the parts.
What is port through strainer and heat the water. Use a marble to remove the iron marbles.
400
Name a property of Florine.
What is it is a gas at room temperature and pressure
400
Which equipment will best separate a mixture of sand and water?
What is filter paper, water, and beakers
500
Name two elements other than chlorine (CI) that are likely to form molecules with sodium (Na)
What is Lithium and fluoride. What is Iodine and Rubidium.
500
Use the periodic table to name two metals other than lithium probably tarnish quickly in air.
What is sodium and potasium
500
A science teacher puts out three samples of ammonia in water. All three samples are the same volume. One sample has a faint odor, the second has a strong odor, the third is overwhelming. Explain why the difference in odor tells you that ammonia water is in the mixture.
What is the difference in odors tells you that it is a mixture id because they are in different concentrations.
500
Which element is least likely to combine with another element to form a molecule?
What is neon (Ne) a noble gas
500
Five carbon molecules of methane contain five carbon atoms and 20 hydrogen atoms. What is the chemical formula for methane?
What is CH(4)
M
e
n
u