Leaven Ttt Questions

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1. Which is represented when liquid water becomes a gas at 100°C?

Explanation


 



Water turns into steam, .. or to water vapor at 100 degrees C, or when water boils.




Water is a liquid. When it freezes it is ice. Ice is solid water. When water gets hot it turns into vapour. We call it steam, and it is a gas.
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Leaven Ttt Questions - Quiz

Leaven Ttt is a compilation of 16 questions on different topics of science to jog your mind. What are the things that are explained by science in your normal life? Find out this and more below. All the best.

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2. When heated, mercuric oxide decomposes (separates) to form liquid mercury and oxygen. A scientist heated 10 grams (g) of mercuric oxide and formed 9.3 grams of liquid mercury. How many grams of oxygen were formed?

Explanation

Definition: Law of Conservation of Mass is a relation stating that in a chemical reaction, the mass of the products equals the mass of the reactants.









Definition: Law of Conservation of Mass is a relation stating that in a chemical reaction, the mass of the products equals the mass of the reactants.
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3. Which indicates a chemical reaction is occurring?

Explanation


The formation is gas bubble is an indication of a CHEMICAL REACTION.

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4. Which is the best term to describe a chemical reaction that absorbs heat energy?

Explanation


Endothermic: a reaction or process which absorbs heat from its surroundings." This is sensed or realized in a reduction of temperature.



Endothermic: a reaction or process which absorbs heat from its surroundings.

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5. Which of these best describes a change that is physical?

Explanation

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6. A scientist placed a sample of lithium into a container of water. The scientist observed the lithium floating and making a buzzing sound as gas bubbles were forming around it. Which conclusion is best supported by this observation?

Explanation


The formation is gas bubble is an indication of a CHEMICAL REACTION.


The alkali metals all react violently with water.
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7. Nilson and Kimberly discussed examples of the types of changes in matter.  In which example is a chemical change taking place?

Explanation

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8. Mr. Savion was playing around with his grandfather's lab equipment, when two solutions are combined, a bright red precipitate is formed.   Which is true of the precipitate?

Explanation

A precipitate is a solid that forms and is an indication of a chemical reaction when two clear solution/liquids are mixed.
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9. Liquids placed in a beaker will settle in specific layers. Which physical property of matter does this illustrate?

Explanation


An object's DENSITY is determined by comparing its mass divided by it's volume. If you compare a rock and a cork that are the same size (they have equal volume), which is heavier? The rock is, because it has more mass. The rock is denser than the cork, then, because it has more mass in the same volume.



The same with liquids, the the heavier liquids will go the bottom and the lighter ones will raise to the top.




When have different liquids have different densities (some are less dense than others) and so 'float' on one another, because each liquid has its own weight and density.
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10. The process of digestion breaks down proteins into smaller molecules that are used to rebuild other proteins. During digestion, proteins undergo ______________________________. 

Explanation


 



Digestion is a CHEMICAL reaction. Complex chemical compounds undergo reactions, and are broken down into elements and simple compounds.




Food’s macronutrients undergo chemical breakdown as they move through the digestive system.




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11. Two clear solutions are mixed together in a beaker, Ms. Dava Hunter. Which result would indicate a chemical reaction had occurred between these solutions?

Explanation

Exothermic chemical reactions produce heat.

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12. Read the chemical equation. CH4 + 2O2      -------->   CO2 + 2H2O + energy What is the best description for this equation?

Explanation


Many chemical reactions release energy in the form of heat, these are EXOTHERMIC reactions." 






Many chemical reactions release energy in the form of heat, these are exothermic reactions.
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13. Students performed an investigation on how aluminum cans taken to a recycling center,  were able to be reused. They found out an aluminum can under goes which type of changes?

Explanation

Physical changes involve states of matter and energy. No new substance is created during a physical change, although the matter takes a different form. The size, shape, and color of matter may change. Also, physical changes occur when substances are mixed, but don't chemically react.
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14. Mr. Clodfealter disobeyed this mom while she was away. He combines baking soda and vinegar in a flask. Which is the most likely reason Mr. Clodfealter should place a balloon over the mouth of the flask before he mixes the two substances?

Explanation

Only gas will could escape from the test tube. Liquids and powders would not escape in to the air.
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15. P{margin-bottom:0.08in;} Which statement best describes the formation of rust?

Explanation


When iron and oxygen react in the presence of water or moisture, rust (iron oxide) is formed.




When iron and oxygen react in the presence of water or moisture, rust (iron oxide) is formed.
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16. Tamia Washinton finds a block made from an unknown element. Which is the best way to determine which element was used to create the block?

Explanation


"To determine the density of irregular shaped objects, we use displacement method to calculate the volume of the illregular shaped object. Use the weight scale or balance to find the mass (m) of object. Use this formula to find the density. Density = mass ( m ) / volume ( V )" 




To determine the density of irregular shaped objects, we use displacement method to calculate the volume of the illregular shaped object. Use the weight scale or balance to find the mass (m) of object. Use this formula to find the density. Density = mass ( m ) / volume ( V )
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17. Austin Shrader and his new girl friend ____________ placed 35 grams of ice into a dry, 200-gram container. The top of the container was attached tightly. When the ice was completely melted, the student massed the container with the liquid water. What mass of liquid water should be in the container?

Explanation

The law of conservation of matter states that matter cannot be destroyed or created
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18. Which best describes a solid produced in a solution during a chemical reaction, from Ms. Hunley's experiment?

Explanation


"A precipitate is a solid that forms when two liquids are combined. A common example is that of the mixing of two clear solutions."




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19. Serena was explaining to Carrie, that when a scientist performs an experiment, there are many changes that can occur. Which observation should she list as a chemical change?

Explanation

http://kgortney.pbworks.com/f/chemicalchanges.gifChemical changes occur when a substance combines with another to form a new substance, these processes are called chemical reactions.
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20. When two clear solutions are mixed together in equal amounts, a solid bright yellow substance settles out of the solution. Which best describes what has occurred?

Explanation


"A precipitate is a solid that forms when two liquids are combined. A common example is that of the mixing of two clear solutions."




A precipitate is a solid that forms when two liquids are combined. A common example is that of the mixing of two clear solutions.
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Which is represented when liquid water becomes a gas at 100°C?
When heated, mercuric oxide decomposes (separates) to form liquid...
Which indicates a chemical reaction is occurring?
Which is the best term to describe a chemical reaction that absorbs...
Which of these best describes a change that is physical?
A scientist placed a sample of lithium into a container of water. The...
Nilson and Kimberly discussed examples of the types of changes in...
Mr. Savion was playing around with his grandfather's lab equipment,...
Liquids placed in a beaker will settle in specific layers. Which...
The process of digestion breaks down proteins into smaller molecules...
Two clear solutions are mixed together in a beaker, Ms. Dava Hunter....
Read the chemical equation. ...
Students performed an investigation on how aluminum cans taken to a...
Mr. Clodfealter disobeyed this mom while she was away. He combines...
P{margin-bottom:0.08in;} ...
Tamia Washinton finds a block made from an unknown element. Which is...
Austin Shrader and his new girl friend ____________ placed 35 grams of...
Which best describes a solid produced in a solution during a chemical...
Serena was explaining to Carrie, that when a scientist performs an...
When two clear solutions are mixed together in equal amounts, a solid...
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