Leaven Ttt Questions

20 Questions | By Leavendl | Updated: Mar 20, 2022 | Attempts: 415

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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.

Questions and Answers

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.
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
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.
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
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
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.
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
8.

Which is the best term to describe a chemical reaction that absorbs heat energy?
- A.
  
  Catalytic
- B.
  
  Exothermic
- C.
  
  Endothermic
- D.
  
  Extendheat
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.
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
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.
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
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
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
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
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.
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.
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
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
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