Leaven Ttt Questions
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.
- 1.
The process of digestion breaks down proteins into smaller molecules that are used to rebuild other proteins. During digestion, proteins undergo ______________________________.
- A.
Cell division.
- B.
Nuclear reactions.
- C.
Natural selection.
- D.
Chemical changes.
Correct Answer
D. Chemical changes.Explanation
Digestion is a CHEMICAL reaction. Complex chemical compounds undergo reactions, and are broken down into elements and simple compounds.Rate this question:
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- 2.
Which is represented when liquid water becomes a gas at 100°C?
- A.
Density of water
- B.
Solubility of water
- C.
Boiling point of water
- D.
Chemical reactivity of water
Correct Answer
C. Boiling point of waterExplanation
Water turns into steam, .. or to water vapor at 100 degrees C, or when water boils.Rate this question:
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- 3.
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?
- A.
Water was vaporized.
- B.
A chemical change took place.
- C.
The lithium was dissolved by the water.
- D.
Dissolved gases were released.
Correct Answer
B. A chemical change took place.Explanation
The formation is gas bubble is an indication of a CHEMICAL REACTION.Rate this question:
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- 4.
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?
- A.
A physical changes because the can is heated and reshaped
- B.
A chemical changes because new metal is formed
- C.
A physical change because the no changes are made
- D.
A chemical change because an old can is changed into a new can
Correct Answer
A. A pHysical changes because the can is heated and reshaped -
- 5.
Liquids placed in a beaker will settle in specific layers. Which physical property of matter does this illustrate?
- A.
Density
- B.
Polarity
- C.
Solubility
- D.
Malleability
Correct Answer
A. DensityExplanation
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.Rate this question:
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- 6.
p{margin-bottom:0.08in;} Which statement best describes the formation of rust?
- A.
Rust results from a physical mixing of iron with water.
- B.
Rust forms from a chemical breakdown of old metal.
- C.
Rust results from a chemical reaction between iron and water.
- D.
Rust forms from a physical change when wind blows against metal.
Correct Answer
B. Rust forms from a chemical breakdown of old metal.Explanation
When iron and oxygen react in the presence of water or moisture, rust (iron oxide) is formed.Rate this question:
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- 7.
Read the chemical equation. CH4 + 2O2 --------> CO2 + 2H2O + energy What is the best description for this equation?
- A.
Energy is absorbed.
- B.
Energy is released.
- C.
Energy stays the same.
- D.
It changes 5 colors
Correct Answer
B. Energy is released.Explanation
Many chemical reactions release energy in the form of heat, these are EXOTHERMIC reactions."Rate this question:
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- 8.
Which is the best term to describe a chemical reaction that absorbs heat energy?
- A.
Catalytic
- B.
Exothermic
- C.
Endothermic
- D.
Extendheat
Correct Answer
C. EndothermicExplanation
Endothermic: a reaction or process which absorbs heat from its surroundings." This is sensed or realized in a reduction of temperature.Rate this question:
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- 9.
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?
- A.
The equipment was heated before the experiment.
- B.
The shape of the substance changed.
- C.
The volume of the substance changed.
- D.
The substance changed into a new substance.
Correct Answer
D. The substance changed into a new substance. -
- 10.
Which indicates a chemical reaction is occurring?
- A.
A substance melting
- B.
A substance evaporating
- C.
Bubbles forming when two substances are mixed
- D.
Temperature remaining the same when two substances are mixed
Correct Answer
C. Bubbles forming when two substances are mixedExplanation
The formation is gas bubble is an indication of a CHEMICAL REACTION.Rate this question:
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- 11.
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?
- A.
A physical change created a new yellow solution.
- B.
A chemical change created a new yellow solution.
- C.
A physical change created a new yellow precipitate.
- D.
A chemical change created a new yellow precipitate.
Correct Answer
D. A chemical change created a new yellow precipitate.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."Rate this question:
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- 12.
Two clear solutions are mixed together in a beaker, Ms. Dava Hunter. Which result would indicate a chemical reaction had occurred between these solutions?
- A.
Increase of volume in the beaker
- B.
Decrease of volume in the beaker
- C.
Increase in temperature of the beaker
- D.
Increase in height of the beaker
Correct Answer
C. Increase in temperature of the beakerExplanation
Exothermic chemical reactions produce heat.Rate this question:
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- 13.
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?
- A.
Test the malleability of the block
- B.
Determine the mass of the block
- C.
Calculate the density of the block
- D.
Observe the reaction between the block and a nonmetal
Correct Answer
C. Calculate the density of the blockExplanation
"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 )"Rate this question:
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- 14.
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?
- A.
35 grams
- B.
165 grams
- C.
200 grams
- D.
235 grams
Correct Answer
C. 200 grams -
- 15.
Which of these best describes a change that is physical?
- A.
Yarn being knitted into a sweater
- B.
The engine from a tractor being started
- C.
The metal on a bicycle forming rust
- D.
Grass capturing the energy from sunlight
Correct Answer
A. Yarn being knitted into a sweater -
- 16.
Nilson and Kimberly discussed examples of the types of changes in matter. In which example is a chemical change taking place?
- A.
A piece of metal is cut in half.
- B.
An ice cube melts on a counter.
- C.
A camper roasts marshmallows over a burning fire.
- D.
A baker mixes together flour and sugar to make dough.
Correct Answer
C. A camper roasts marshmallows over a burning fire. -
- 17.
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?
- A.
It has a mass greater than the two liquids
- B.
It is formed as a result of a chemical reaction.
- C.
It has a higher temperature than the two solutions.
- D.
It is formed through a change in physical state of one of the solutions.
Correct Answer
B. It is formed as a result of a chemical reaction. -
- 18.
Which best describes a solid produced in a solution during a chemical reaction, from Ms. Hunley's experiment?
- A.
Acid
- B.
Solute
- C.
Reactant
- D.
Precipitate
Correct Answer
D. PrecipitateExplanation
"A precipitate is a solid that forms when two liquids are combined. A common example is that of the mixing of two clear solutions."Rate this question:
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- 19.
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?
- A.
To prevent any gas formed as a product from escaping during the reaction
- B.
To prevent any liquid used as a reactant from escaping during the reaction
- C.
To prevent any powder used as a reactant from escaping during the reaction
- D.
To prevent any liquid formed as a product from escaping during the reaction
Correct Answer
A. To prevent any gas formed as a product from escaping during the reactionExplanation
Only gas will could escape from the test tube. Liquids and powders would not escape in to the air.Rate this question:
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- 20.
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?
- A.
0.7 g
- B.
9.3 g
- C.
10.0 g
- D.
19.3 g
Correct Answer
A. 0.7 gExplanation
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.Rate this question:
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Current Version
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Mar 20, 2023Quiz Edited by
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Oct 31, 2013Quiz Created by
Leavendl
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