Science test

hi

what is matter

anything that has mass or takes up space.

What is a compound?

 a thing that is composed of two or more separate elements; a mixture.

How is a heterogeneous mixture different from a homogeneous mixture?

Heterogeneous mixtures have visually distinguishable components, while homogeneous mixtures appear uniform throughout.

What are the different phases of matter?

a solid, a liquid, or a gas. Plasma bose einstein condensate 

How do the particles of a solid, liquid, and gas behave?  

gas vibrates and moves freely at high speeds. liquid vibrates, moves about, and slides past each other. solid vibrate (jiggle) but generally do not move from place to place.

 What happens to the particles of matter if heat is added? What theory explains this phenomenon?

the particles gain kinetic energy and vibrate faster and more strongly

What is the difference between a chemical property and a physical property? 

A chemical property describes the ability of a substance to undergo a specific chemical changes a physical property is a characteristic of matter that is not associated with a change in its chemical composition.

What is the difference between a chemical change and a physical change?  

in a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. However in a chemical change, the kind of matter changes and at least one new substance with new properties is formed

How does temperature change as a liquid becomes a gas? 

**the temperature of the substance does not change during vaporization**.

How does temperature change during the melting phase?

**it does not go into changing the temperature of a substance**

How does heat energy change during the melting phase? 

**energy goes exclusively to changing the phase of a substance**

 What 2 pieces of information do you need to find the density of an object?  **mass of an object divided by its volume**.

**mass of an object divided by its volume**.

What do objects with less density do?

**they will float**.

What do objects with more density do? 

they **will sink**

What does Boyle’s Law say about the relationship between pressure and volume? 

**The volume of gas is inversely proportional to the pressure exerted by the gas**.

What does Charles’ law say about the relationship between temperature and volume? 

**The volume of a given amount of gas is directly proportional to its temperature on the kelvin scale when the pressure is held constant**.

What does Gay Lussac’s law say about the relationship between temperature and pressure?   

**The pressure of a given amount of gas held at constant volume is directly proportional to the Kelvin temperature**.

 What are the 2 parts of a solution? Can you pick out the two parts? 

**the solute and the solvent**

 What can be done to increase the dissolving rate of a solute? 

**Stirring a solute into a solvent**

What typically happens to the solubility of a substance as temperature increases?

**the solubility (concentration) increases**

What are the properties of acids? 

Acids have a sour taste. Acids turn blue litmus red. Acids have pH less than 7.

What are some properties of bases?

Bases change the color of litmus from red to blue. They are bitter in taste. Bases lose their basicity when mixed with acids.

What are some common household products that are acids?

Vinegar lemon juice citrus fruit 

What are some common household products that are bases?

Baking soda soap shampoo 

If a substance has a pH of 4, what does this mean?

Its an acid 

What is the chemical reaction that takes place when an acid mixes with a base?

Neutralization reaction

What is the product of neutralization? (hint: there are 3 products)

Salt water gas