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Questions
Questions
Questions
Questions
NJ Ask Practice
100
Is ice melting a physical or chemical change? Explain.
What is ice melting is a physical change. It is a physical change because it doesn't change properties.
100
Propane has a chemical formula C3H8. How many hydrogen and carbon atoms are in a molecule of propane?
What is carbon has 3 atoms and hydrogen has 8 atoms.
100
Name the element Te. Tell whether it is a metal, nonmetal, or metalloid.
What is Tellurium-metalloid
100
Name the element Mgl2 and tell whether it is a metal or nonmetal.
What is Magnesium and iodine, metal and nonmetal
100
Which element is least likely to combine with another element to form a molecule?
What is Neon (NE), a noble gas
200
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 reaction happens before products. Reactant: food eaten Saliva in your mouth, stomach acid. Product: anything that your body produces from chemically altering the food.
200
What four elements have chemical properties most similar to those of fluorine in column VII A?
What is Iodine, bromine, chlorine, and astatine.
200
Name the element I. Tell whether it is a metal, nonmetal, or metalloid.
What is Iodine-nonmetal
200
Name the element Cl and tell whether it is a metal or a nonmetal.
What is Chlorine- 2 nonmetal
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 from exactly 1 kg of XY2, with no reactants left over. Which of the following could be amounts of X and Y in the reaction?
What is 150 g of X and 300 g of Y
300
Most first-aid kits have chemical-filled packets that, when squeezed, grow very cold. Is this chemical reaction in such a packet endothermic or exothermic? Explain.
What is an ice pack is an endothermic reaction because it absorbs heat. If you put the pack on your skin, it will pull heat energy from your body and feel cold.
300
Name the element Ag. Then state if it is a metal, nonmetal, or metalloid.
What is Silver- metal
300
Nam two metals other than lithium that probably tarnish quickly in air.
What is Sodium and Magnesium
300
Which correctly compares the elements on the right side of the periodic table with the elements on the left side of the periodic table?
What is the elements on the left side are better conductors of electricity than the elements on the right side.
300
Which of the following is an example of a chemical change?
What is an iron bridge turning brownish-red over the years.
400
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.
What is Matter is neither created or destroyed in chemical reactions. The fuel is converted into gas which escaped into the atmosphere.
400
Name the element P. Tell weather it is a metal, nonmetal, and metalloid.
What is Phosphorus-nonmetal
400
Name two elements other than chlorine that are likely to form molecules with sodium.
What is potassium and fluorine.
400
Which equipment will best separate a mixture of sand and sugar?
What is filter paper, water, and beakers
500
A molecule of hydrogen peroxide has one more oxygen atom than a molecule of water. What is the chemical formula of hydrogen peroxide?
What is H202.
500
Name the element Li. Tell whether it is a metal, nonmetal and metalloid.
What is Lithium-metal
500
Name the element N2. Tell whether it is a metal or nonmetal.
What is Nitrogen- 2 nonmetals
500
Which of the following is a property of fluorine, a nonmetal?
What is it is a gas at room temperature and pressure.
500
Five molecules of methane contain five carbon atoms and 20 hydrogen atoms. What is the chemical formula of methane?
What is C5H20