What are the chemical properties of metals & non-metals?
Chemical Property of Metals:Usually have 1-3 electrons in their outer shell. Lose their valence electrons easily.Form oxides that are basic.Are good reducing agents.Have lower electronegativities.Chemical Property of Non Metals: Usually have 4-8 electrons in their outer shell. Gain or share valence electrons easily.Form oxides that are acidic.Are good oxidizing agents.Have higher electronegativities.
Is cutting grass a physical or chemical change?
also answer some of these questions: are these physical or chemical changes? 1.glass breaking 2.hammering wood together 3.a rusting bicycle 4.melting butter 5.separate sand from gravel 6.burning leaves 7.cutting your hair 8.crushing a can 9.boiling water 10.water evaporating 11.mixing oil and water
Please help me? 8th grade multiple choice? Chemical Changes?
Leaves change color mostly through a chemical change. Physically, the color changes as a result of the chemical change. The best answer is probably "chemical". Water evaporating is not a chemical change. The water molecules are still water after they evaporate, so they have not changed as chemicals. This is clearly a physical change. Odors are chemical changes, but again the question is vague. A phase change can involve a liquid becoming a gas and odors are gasses. Like water, evaporating perfume is a physical change. Again, my guess is "chemical" is the best answer. Chemical changes always involve the breaking of bonds, so this is definetly the definition of a chemical change. I have no idea what "ionic" or "covalent" changes are. These are totally academic terms whose meaning only exists in some textbook. I have never heard them used during the 25 years I've worked as a chemist. BTW: It's obvious why you are having difficulty with this homework. It is badly taught science. Most of the questions have more than 1 correct answer, but only the instructor knows the correct one. Students should not have to read their instructor's minds.
Physical Science Question?
A science class is studying physical and chemical changes. The teacher puts a beaker of water onto a hot plate and heats it until bubbles appear. a. Classify this as a physical or chemical change. Explain your reasoning using specific details. The teacher puts a sugar cube into a container of warm water. Eventually the sugar cube is no longer visible. b. Classify this as a physical or chemical change. Explain your reasoning using specific details. The teacher pours vinegar into a small container of baking soda. The combined substances begin to fizz and bubble as a gas is released. c. Classify this as a physical or chemical change. Explain your reasoning using specific detains ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~... Even just knowing if it's a physical or chemical change can help...but explaining could get you best answer!
Is sodium bicarbonate mixed with hydrochloric acid a physical or chemical change?
It will produce CO2 and make it a chemical change.
Physical science question?
If the object is made entirely of one substance, then the only properties the object has that are not properties of the substance are size and shape. Any chemical or physical test you do on a small sample taken from the object is a test on the substance, since the sample you removed is no longer part of the object.
Help on 8th grade science questions.?
1) If you heat liquid and measure the temperature at which it boils, you are measuring a(n) a. atomic property b. physical property c. chemical property d. molecular property 2. If you describe methane as a gas that easily catches fire, you are describing a a. state of matter b. physical property c. chemical property d. chemical formula 3. Which of these statements is false? a. Oxygen and copper are examples of elements b. Elements are pure substances c. Atoms of different elements can combine to form compounds d. Atoms of different elements are the same 4. Lemonade consists of several substances that are NOT chemically combined, so lemonade is classified as a(n) a. element b. compound c. mixture d. pure substance 5. How do liquid water, ice and water vapor differ from each other? a. They are different states of matter b. They are different compounds c. They are made of different kinds of molecules d. They are made of different kinds of atoms 6. Which of the following is NOT an example of a chemical change? a. Gas burning on a stove b. Rush forming on an iron fence c. Salt dissolving in a glass of water d. Using electricity to break down water into hydrogen and oxygen 7. What characteristics listed below do photosynthesis and combustion do not share? a. Both involve chemical change. b. Both are endothermic c. Both change energy from one form to another d. Both cause changes in matter 8. During photosynthesis, plants transform electromagnetic energy from the sun into... a. electrical energy b. exothermic energy c. chemical energy d. thermal energy ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~... your help is appreciated :D
Physical Science, need help with one question, please.?
Neon is a noble gas and is therefore very stable, taking part in very few chemical reactions. This is due to its stable, full 8-electron structure on its outer shell. Lithium has a lone electron on its outer shell, which is repelled by the inner electrons and is therefore prone to leaving the atom to form an Li+ ion, which takes part in many reactions. eg: Lithium reacts with oxygen to form Lithium (II) oxide. Not sure about the determining part. Sorry :S
8th grade science open response question, if you get it right first it's 10pts!!!!?
(i am not cheating on anything, i am trying to study but i dont have the answers for the problems so i wont know if i get em right or wrong, please helpppp!!!) open response: 1. A science class is studying physical and chemical changes. the teacher puts a beaker of water onto a hot plate and heats it until bubbles appear. A. classify this as a chemical or physical change. explain your reasoning using specific details. The teacher puts a sugar cube into a container of warm water. eventually the sugar cube is no longer visible. B. classify this as a physical or chemical change. explain your reasoning with specific reasoning. the teacher pours vinegar into a small container of baking soda. the combined substances began to combine and fizz and bubble as a gas is released. C. classify this as a physical or chemical change. explain your reasoning using specific details.