Questions
Questions
Questions
NJ Ask
NJ Ask
100
what is p on the periodic table? is it a metal, metalloid, or a nonmetal?
What is V A, and nonmetal
100
Propane has the chemical formula C3H8. How many hydrogen and carbon atoms are in a molecule of propane.
What is there are 8 hydrogen atoms and 3 carbon atoms in a molecule of propane.
100
Is ice melting a physical or chemical change?
What is physical change b/c the ice is being melted in water, without changing its properties.
100
Which correctly compares the elements on the right side of the periodic table with the elements on the left side of the period table?
What is the elements on the left side are better conductors of electricity than the elements on the right side
100
Five molecules of methane contain five carbon atoms and 20 hydrogen atoms. What is the chemical formula of methane?
What is CH 4
200
what is Li on the periodic table? is it a metal, metalloid, or a nonmetal?
What is I A, and metal.
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 reactants happen before products. First, you took a bite and then you chew, with saliva and stomach and then, the product is when your body produces energy from chemically altered food.
200
Which is a property of fluorine (F), a non-metal
What is it is a gas at room temperature and pressure
200
Dr. Halite sodium metal with chlorine gas to make sodium chloride (table salt). The chemical reaction used up all of 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? Describe the law of nature that supports your answer.
What is 48 grams and the law of conservation of mass
300
what is Te on the periodic table? is it a metal, metalloid, or a nonmetal?
What is VI A, and Metalloid.
300
How many hydrogen and oxygen atoms exist before the reaction.
What is 8 hydrogen and 4 oxygen.
300
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 an ice pack is an endothermic reaction because it absorbs heat. if you put the pack on your skin, it will use heat energy from you body and feel cold
300
Which element is least likely to combine with another element to form a molecule?
What is neon (Ne), a noble gas
300
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 sample of element Y react to form exactly 1 kg of XY2 with no reactants left over. Which could be the amounts of X and Y in the reactions?
What is 150 g of X and 300 g of Y
400
what is I on the periodic table? is it a metal, metalloid, or a nonmetal?
What is VII A, and nonmetal.
400
What four elements have chemical properties most similar to those fluorine in column VII A?
What is Fluorine,Chlorine, Bromine, Iodine, Astatine.
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 escapes into the atmosphere.
400
Which is an example of a chemical change?
What is an iron bridge turning brownish-red over the years
400
What is a noble gas?
What is a gas that rarley reacts with other elements such as helium.
500
Use the periodic table to name two metals other than lithium (Li) that probably tarnish quickly in air.
What is hydrogen and sodium.
500
What is Ag on the periodic table? is it a metal, metalloid, or a nonmetal?
What is Silver, and metal.
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 an element is a substance that cannot be broken down in simpler substances by physical or chemical means. As atom is the smallest unit of an element that has a chemical property of that element.
500
Which equipment will best separate a mixture of sand and sugar?
What is filter paper, water and beakers
500
What is endothermic mean?
What is a type of chemical change that absorbs heat energy from its surroundings?
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