Dissolution

Question: Is Dissolving Sugar in Water a Chemical or Physical Change?

Is dissolving sugar in water an example of a chemical or physical change? This process is a little trickier to understand than most, but if you look at the definition of chemical and physical changes, you'll see how it works. Here's the answer and an explanation of the process.

Answer: Dissolving sugar in water is an example of a physical change. Here's why: A chemical change produces new chemical products. In order for sugar in water to be a chemical change, something new would need to result. A chemical reaction would have to occur. However, mixing sugar and water simply produces... sugar in water! The substances may change form, but not identity. That's a physical change.

One way to identify some physical changes (not all) is to ask whether the starting materials or reactants have the same chemical identity as the ending materials or products. If you evaporate the water from a sugar-water solution, you're left with sugar.

Whether Dissolving Is a Chemical or Physical Change

Any time you dissolve a covalent compound like sugar, you're looking at a physical change. The molecules get further apart in the solvent, but they don't change.

However, there's dispute about whether dissolving an ionic compound (like salt) is a chemical or physical change because a chemical reaction does occur, where the salt breaks into its component ions (sodium and chloride) in water. The ions display different properties from the original compound. That indicates a chemical change. On the other hand, if you evaporate the water, you're left with salt. That seems consistent with a physical change. There are valid arguments for both answers, so if you're ever asked about it on a test, be prepared to explain yourself.

http://chemistry.about.com/od/matter/f/Is-Dissolving-Sugar-In-Water-A-Chemical-Or-Physical-Change.htm

Chemical Reaction Quiz

2. Marco 

The student is able to distinguish between physical change and chemical reaction           1.Marco tears a piece of notebook paper into smaller pieces, tearing paper into pieces is an example of what kind of change?                2. Which process is an example of a physical change?           A. burning B. rusting .  C.flattening 3. Chemical changes result in new substances, but physical changes do not. Which process is an example of a chemical change? A. baking a cake B. chopping a tree  C. heating a cup of tea   4.  Which observation is a sign of a chemical change? A. A rotting potato gives off a bad smell. B. A melting block of ice leaves a large puddle. C. A cloud changes shape when blown by wind. D. A plaster statue breaks when it falls onto the floor.                      5. There are several differences between chemical and physical changes. Which process is an example of a chemical change? A. steam rising from a boiling pot of soup B. a metal railing rusting in damp weather C. alcohol evaporating from a cotton swab D. a piece of wood shrinking as it dries out Chemical reaction I researched more than requested and can accurately identify and explain a chemical reaction. I can identify and explain a chemical reaction. I still can’t identify and explain a chemical reaction. What I will do now.                                    .

Chemical vs Physical Change

Changes

Physical and Chemical Changes

Physical & chemical changes from butch2bn

Chemical and Physical Change

Xylem and Phloem

Vascular Systems of Plants

Xylem and phloem make up the big transportation system of vascular plants. As you get bigger, it is more difficult to transport nutrients, water, and sugars around your body. You have a circulatory system if you want to keep growing. As plants evolved to be larger, they also developed their own kind of circulatory systems. The main parts you will hear a lot about are called xylem and phloem.

It all starts with a top and a bottom. Logically, it makes sense. Trees and other vascular plants have a top and a bottom. The top has a trunk, branches, leaves, or needles. The bottom is a system of roots. Each needs the other to survive. The roots hold the plant steady and grab moisture and nutrients from the soil. The top is in the light, conducting photosynthesis and helping the plant reproduce. You have to connect the two parts. That's where xylem and phloem come in. 

                                                     Xylem  (UP)

The xylem of a plant is the system of tubes and transport cells that circulates water and dissolved minerals. As a plant, you have roots to help you absorb water. If your leaves need water and they are 100 feet above the ground, it is time to put the xylem into action! Xylem is made of vessels that are connected end to end for the maximum speed to move water around. They also have a secondary function of support. When someone cuts an old tree down, they reveal a set of rings. Those rings are the remains of old xylem tissue, one ring for every year the tree was alive. 

                                                   Phloem  (DOWN)

The fun never stops in the plant's circulatory system. Most plants have green leaves, where the photosynthesis happens. When those sugars are made, they need to be given to every cell in the plant for energy. Enter phloem. The phloem cells are laid out end-to-end throughout the entire plant, transporting the sugars and other molecules created by the plant. Phloem is always alive. Xylem tissue dies after one year and then develops anew (rings in the tree trunk). What is the best way to think about phloem? Think about sap coming out of a tree. That dripping sap usually comes from the phloem.

http://www.biology4kids.com/files/plants_xylemphloem.html

I am important!

Why plants are important? de Biology Exams 4 U

The Importance of Plants

Photosynthesis (teach) de Moira Whitehouse

Cell to Organism

Videos: Label the organelles

Label the Organelles

http://www.lahc.cc.ca.us/biology/bio3/mchernoff/quiz.html

Cells to Systems

http://www.bbc.co.uk/bitesize/ks3/science/organisms_behaviour_health/cells_systems/activity/

http://www.livebinders.com/play/play?id=46976

The Cell Theory Song

Cells Cells - Parts of the Cell Rap

Plant Cell

Cell Wall -

Function: Maintain cell pressure and prevent over-expansion of cells

Cell Membrane-

Function: Protects the cell from surrounding

Chloroplast-Found only in plants
Function: Conducts photosynthesis

Cytoplasm -

Function: Site of multiple cell processes including, cell metabolism

Golgi Body/apparatus -
Function: Sorting, processing and modifying proteins

Lysosomes-

Rare in plant cells.

Function:help bbreak down nutrients and old cell parts.

Mitochondrion-

Known to be the 'power house' or the 'storehouse of energy' of the cell, the mitochondria plays an important role in a cell.
Function: Energy production and conversion, regulates cell metabolism

Nucleus -

Function: Controls expression and transcription of the gene

Peroxisomes -

Membrane-bound packets of oxidative enzymes, the peroxisomes play a vital role in converting fatty acids to sugar. They also assist the chloroplasts in photo-respiration. Their functions include the glyoxylate cycle that occurs in germinating seeds and photo-respiration in leaves.

Function: Breakdown of metabolic hydrogen peroxide

Ribosomes-

Function: Protein builders and synthesizers

Smooth Endoplasmic Reticulum-

Similar to the structure of the rough ER, the smooth ER is a separate interconnected network membrane structure that is free from ribosomes. The SER transports material through the cell. It is also crucial in producing and digesting lipids and proteins.

Function: Manufactures and transports lipids

Vacuole- 

One large central vacuole.
Function: Regulates internal environment

http://www.buzzle.com/articles/labeled-plant-cell-diagram-and-functions.html

Animal cell

The following is a glossary of animal cell terms: 
cell membrane - the thin layer of protein and fat that surrounds the cell. The cell membrane is semipermeable, allowing some substances to pass into the cell and blocking others.
centrosome - (also called the "microtubule organizing center") a small body located near the nucleus - it has a dense center and radiating tubules. The centrosomes is where microtubules are made. During cell division (mitosis), the centrosome divides and the two parts move to opposite sides of the dividing cell. The centriole is the dense center of the centrosome.
cytoplasm - the jellylike material outside the cell nucleus in which the organelles are located.
Golgi body - (also called the Golgi apparatus or golgi complex) a flattened, layered, sac-like organelle that looks like a stack of pancakes and is located near the nucleus. It produces the membranes that surround the lysosomes. The Golgi body packages proteins and carbohydrates into membrane-bound vesicles for "export" from the cell.
lysosome - (also called cell vesicles) round organelles surrounded by a membrane and containing digestive enzymes. This is where the digestion of cell nutrients takes place.
mitochondrion - spherical to rod-shaped organelles with a double membrane. The inner membrane is infolded many times, forming a series of projections (called cristae). The mitochondrion converts the energy stored in glucose into ATP (adenosine triphosphate) for the cell.
nuclear membrane - the membrane that surrounds the nucleus.
nucleolus - an organelle within the nucleus - it is where ribosomal RNA is produced. Some cells have more than one nucleolus.
nucleus - spherical body containing many organelles, including the nucleolus. The nucleus controls many of the functions of the cell (by controlling protein synthesis) and contains DNA (in chromosomes). The nucleus is surrounded by the nuclear membrane.
ribosome - small organelles composed of RNA-rich cytoplasmic granules that are sites of protein synthesis.
rough endoplasmic reticulum - (rough ER) a vast system of interconnected, membranous, infolded and convoluted sacks that are located in the cell's cytoplasm (the ER is continuous with the outer nuclear membrane). Rough ER is covered with ribosomes that give it a rough appearance. Rough ER transports materials through the cell and produces proteins in sacks called cisternae (which are sent to the Golgi body, or inserted into the cell membrane).
smooth endoplasmic reticulum - (smooth ER) a vast system of interconnected, membranous, infolded and convoluted tubes that are located in the cell's cytoplasm (the ER is continuous with the outer nuclear membrane). The space within the ER is called the ER lumen. Smooth ER transports materials through the cell. It contains enzymes and produces and digests lipids (fats) and membrane proteins; smooth ER buds off from rough ER, moving the newly-made proteins and lipids to the Golgi body, lysosomes, and membranes.
vacuole - fluid-filled, membrane-surrounded cavities inside a cell. The vacuole fills with food being digested and waste material that is on its way out of the cell.

Plant vs Animal Cells

Organelles of the Cell (updated)

Cell Organelles- Part 1

"Cells Are Clever"

Living and Non-Living Things

Read the text.

In your blog book copy and answer the questions below.

                                  Living and Non-Living Things

The world is made up of many different things. Some of the things are living and others are non-living. A dog, swing set, car, tree, flowers, and a book are some of the things that make up the world.

There are two different kinds of things in the world. One kind is called living things. Living things eat, breathe, grow, move, reproduce and have senses. The other kind is called nonliving things. Nonliving things do not eat, breathe, grow, move and reproduce. They do not have senses.

An example of a living thing in the world is a dog. A dog is an animal, and dogs need food, water, space, and shelter. The dog is a living thing. A tree or flower is a plant, and trees and flowers need air, nutrients, water, and sunlight. A flower and tree are also living things. Plants are living things and they need air, nutrients, water, and sunlight. Other living things are animals, and they need food, water, space, and shelter. A dog eats food, breathes in air, and grows from a puppy to a dog. A dog reproduces. Reproduce means to make one of its own kind. A dog also has senses. Senses are seeing, hearing, smelling, tasting, and feeling.

Other living things include people, cats, rabbits, bugs, lions, and many others. There are many different kinds of plants, too. Plants can include dandelions, grass, corn, tomatoes and much more.

Non-living things include things that do not need food, eat, reproduce, or breathe. A car does not eat or grow. It does not move unless a person is driving it. It does not need air to breathe and it has no sense. It is a non-living thing. A swing set does not use food. A book does not move. The swing set and book do not grow and they do not need air to breathe. They are non-living things. Nonliving things do not need air, food, nutrients, water, sunlight, or shelter. Other non-living things in the world include pencils, rocks, footballs, toys, hats, and many others.

One more example of a living thing is a bird. A bird eats seeds or worms. It breathes in air. It comes from an egg and grows. It moves by flying. It lays eggs and reproduces. It smells and sees because it has senses. A bird is a living thing.

One more example of a non-living things is a ball. A ball does not eat anything. It does not need to breathe. It never grows. It never moves unless a person throws or rolls it. The ball does not reproduce. It cannot hear or feel and it has no senses. A ball is a non-living thing.

In summary, everything in the world is a living thing or a non-living thing. Living things can be plants which need air, water, nutrients, and sunlight. Living things can be animals which need food, water, space, and shelter. There are living things and nonliving things everywhere. Living things eat, breathe, grow, move, reproduce and have senses. Reproduce means to make one of its own kind. The senses are seeing, hearing, smelling, tasting, and feeling. Nonliving things do not eat, breathe, grow, move and reproduce. They do not have senses. A dog and tree are living things. A book and a car are nonliving things.

1) Which of the following is an example of a living thing?

A: Worm

B: House

C: Baseball

D: Car

2) A living thing eats, grow, moves, reproduces and has

A: Size

B: Water

C: Senses

D: Skin

3) A living thing does all of the following EXCEPT:

A: Eats

B: Grows

C: Moves

D: Lives forever

4) Which of the following is an example of a non-living thing?

A: Bird

B: Ball

C: Cat

D: Dog

5) Which of the following best defines reproduce?

A: To eat food to stay alive

B: Breathing in air

C: To move back and forth

D: To make one of its own kind

6) How many senses do we have?

A: 3

B: 4

C: 5

D: 6

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