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100
Is ice melting a physical or chemical change?
What is physical change?
100
Propane has the chemical formula C3H8. How many hydrogen and carbon atoms are in a molecule of propane?
What is hydrogen is 8, and carbon is 3?
100
Use the periodic table to find the name of the element that goes with the symbol. Then state whether the element is a metal, metalloid, or a nonmetal. element- Te
What is tellurium and metalloid?
100
Examine the following chemical formulas. Identify the names of the elements in each molecule. Then, state whether these molecules are made of a metal or nonmetal or two nonmetals. element- N^2
What is two atoms of nitrogen (both nonmetal)?
100
Which of the following is a property of fluorine (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 C. it is a good conductor of electricity and heat?
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. reactants-food eaten, saliva in mouth, and stomach acid products-anythings that your body produces from chemically altering the food
200
Look at the periodic table. What four elements have chemical properties most similar to those of fluorine in column Vll A?
What is chlorine, bromine, and iodine?
200
Use the periodic table to find the name of the element that goes with the symbol. Then state whether the element is a metal, metalloid, or a nonmetal. element- I
What is iodine and nonmetal?
200
Examine the following chemical formulas. Identify the names of the elements in each molecule. Then, state whether these molecules are made of a metal or nonmetal or two nonmetals. element- MgI^2d
What is magnesium and two atoms of iodine (metal and nonmetal)?
200
Which of the following correctly compares the element 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 pints than the elements on the right side.
What is B. The elements on the left side are better conductors of electricity than the elements on the right side?
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 ice packs are 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
Use the periodic table to find the name of the element that goes with the symbol. Then state whether the element is a metal, metalloid, or a nonmetal. element- Ag
What is silver and metal?
300
Use the periodic table to name two metals other than lithium (L) that probably tarnish quickly in air.
What is sodium and potassium?
300
Examine the following chemical formulas. Identify the names of the elements in each molecule. Then, state whether these molecules are made of a metal or nonmetal or two nonmetals. Element- Cl2.
What is two atoms of chlorine (both nonmetals)?
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 D. Silicon (Si), a metalloid?
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
Use the periodic table to find the name of the element that goes with the symbol. Then state whether the element is a metal, metalloid, or a nonmetal. element- P
What is phosphorous and nonmetal?
400
Name two elements other than chlorine (C) that are likely to form molecules with sodium (Na).
What is fluorine and lithium produce salt. Iodine and rubidium also produce salt.
400
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 sample has a strong odor, and the third sample has an overwhelming odor. Explain why the difference in odors tells you that ammonia in water is a mixture.
What is ammonia has no odor. When it is mixed with water, it creates a odor, and you know that it's a mixture?
400
Which of the following is an example of a chemical change? A. a chunk of metal being hammered until its flat B. a piece of chalk being crushed into a powder C. a solid rock melting into magma D. an iron bridge turning brownish-red over the years
What is D. an iron bridge turning brownish-red over the years?
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 water- h2o hydrogen-H2o2
500
Use the periodic table to find the name of the element that goes with the symbol. Then state whether the element is a metal, metalloid, or a nonmetal. element- Li
What is Litium and metal
500
Examine the following chemical formulas. Identify the names of the elements in each molecule. Then, state whether these molecules are made of a metal or nonmetal or two nonmetals. Element- LiF
What is a lithium and fluorine (metal and nonmetal)?
500
Mixture A has water and glass marbles. Describe the process for separating out the parts.
What is take out the marbles?
500
What equipment would best separate a mixture of sand and sugar?
What is a filter paper, water, and beakers?