100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
Praxis II general science(material on the Praxis II general science exam) Exam with Complete Solutions CA$23.12   Add to cart
Quickly navigate to
Preview
  2.  
  3. Praxis 2
  4.  
  5. Praxis 2

Exam (elaborations)

Praxis II general science(material on the Praxis II general science exam) Exam with Complete Solutions

 14 views  0 purchase
  • Course
  • Praxis 2
  • Institution
  • Praxis 2

Praxis II general science(material on the Praxis II general science exam) Exam with Complete Solutions matter Correct answer-anything that has mass and occupies volume matter is made up of atoms and molecules ionic nature of matter Correct answer-Ions are formed when atoms, or groups of atoms,...

[Show more]

Preview 4 out of 42  pages

Document information

  • August 8, 2024
  • 42
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

Subjects

  • praxis ii general sciencematerial on the praxis
  • praxis ii general science exam
  • exam with complete solutions

Written for

  • Praxis 2
  • Praxis 2

Seller

avatar-seller
GOLDTUTORS

Reviews received

Content preview

Praxis II general science(material on the Praxis II general
science exam) Exam with Complete Solutions
matter Correct answer-anything that has mass and occupies volume

matter is made up of atoms and molecules




ionic nature of matter Correct answer-Ions are formed when atoms, or groups of atoms,
lose or gain electrons.

Metals lose some of their electrons to form positively charged ions, e.g. Fe+2, Al+3, Cu+2, etc.

Nonmetals gain electrons and form negatively charged ions, e.g. Cl-, O-2, S-2, etc.




physical properties of matter Correct answer-Physical property changes of matter do not
produce a new substance

Intensive: the same regardless of the amount of matter

* density: m/v

* color: The pigment or shade

* conductivity: electricity to flow through the substance

* malleability: if a substance can be flattened

* luster: how shiny the substance looks

melting and freezing point

Extensive: will change if the amount of matter changes.

* mass: how much matter in the sample

* volume: How much space the sample takes up

* length: How long the sample is

,Praxis II general science(material on the Praxis II general
science exam) Exam with Complete Solutions
chemical properties of matter Correct answer-any of a material's properties that
becomes evident during a chemical reaction-any quality that can be established only by
changing a substance's chemical identity

* Reactivity against other chemical substances

* Heat of combustion

* Enthalpy of formation

* Toxicity

* Chemical stability in a given environment

* Flammability

* Preferred oxidation state(s)

* Coordination number

* Capability to undergo a certain set of transformations, for ex chemical combination, redox
reactions

* Preferred types of chemical bonds to form, for example metallic, ionic, covalent




organization of matter Correct answer-pure substance: no separation by physical means

chemical element: pure chemical substance consisting of one type of atom distinguished by its
atomic number, which is the number of protons in its nucleus

chemical compound: pure chemical substance consisting of two or more different chemical
elements that can be separated into simpler substances by chemical reactions

Solutions: molecules that are mixed up in a completely even distribution, homogenous systems

mixture: substances held together by physical forces, not chemical, can be homogeneous and
heterogeneous

,Praxis II general science(material on the Praxis II general
science exam) Exam with Complete Solutions
A homogeneous mixture is called a solution




Elements Correct answer-pure chemical substance, one type of atom, distinguished by its
atomic number (Z), the number of protons in its nucleus

# of protons determines chemical properties

Mass number (A) is the number of nucleons (p+N) in nucleus

Oxygen most abundant on earth, Hydrogen most abundant in universe

Elements with atomic numbers 83 or higher are inherently unstable, and undergo radioactive
decay

The abundance of the lightest elements is well predicted by the standard cosmological model,
since they were produced shortly after the Big Bang, in a process known as Big Bang
nucleosynthesis. Heavier elements were mostly produced much later, inside stars.




chemical change Correct answer-* Decomposition

* Neutralization (Mixing acid+base=water and a salt).

* Photosynthesis -co2 and water are changed into sugars.

* Cooking examples: cake, pancakes, and eggs/bacon

* Oxidation examples: rust or tarnishing

* Ripening examples: bananas, tomatoes or potatoes

Evidence

* Change of odor

* Change of color

, Praxis II general science(material on the Praxis II general
science exam) Exam with Complete Solutions
* Change in temp or energy, such as the production (exothermic) or loss (endothermic) of heat.

* Change of form (for example, burning paper).

* Light, heat, or sound is given off.

* Formation of gases, often appearing as bubbles.

* Formation of precipitate (insoluble particles).

* The decomposition of organic matter (for ex rotting food).




How did Dalton's atomic theory help support the law of conservation of mass? Correct
answer-According to Dalton's atomic theory :

1. All matter is made up of atoms

2. ATOMS CAN NEITHER BE CREATED NOR DESTROYED

3. Atoms of the same element are identical

4. Atoms of different elements have different properties

5. compounds consisted of atoms of different elements combined together in a particular ratio




forms of energy Correct answer-heat, light, sound, electrical, chemical, nuclear and
mechanical

Work is the amount of energy transferred during an interaction

amount of energy before a transformation = amount of energy after. In most energy
transformations, some energy is converted to thermal energy.




fusion vs fission Correct answer-fission splits a massive element into fragments, releasing

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller GOLDTUTORS. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for CA$23.12. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

75323 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
CA$23.12
  • (0)
  Add to cart