Intro to Chemistry

Precipitate forms when a chemical reaction happens between two liquids

• True

• False

Tags

NGSS.MS-PS1-2

What are some examples of physical properties of matter?​ ​ (a)   ​ (b)   ​ (c)   ​ (d)  

• solubility
• melting point
• hardness
• density
• flammability
• reacts with air

Tags

NGSS.MS-PS1-4

What are some indicators that a chemical reaction has occured?

• Change in sound
• Formation of a solid
• Color change, formation of a precipitate, release of gas, change in temperature
• Increase in pressure

Tags

NGSS.MS-PS1-2

What do you find the density of an object?

• By multiplying the mass of the object by its volume
• By adding the mass of the object and its volume
• By subtracting the mass of the object from its volume
• By dividing the mass of the object by its volume.

What is the density of water?

• 0.5 g/cm³
• 100 g/cm³
• 10 g/cm³
• 1 g/cm³

What does concentration of a solution mean?

• The color of the solution
• The temperature of the solution
• The viscosity of the solution
• Amount of solute present in a given quantity of solvent or solution

What is a heterogeneous mixture?

• A mixture of two or more substances that are easily separated
• A combination of two or more substances that are not uniformly distributed
• A combination of two or more substances that are chemically combined
• A mixture of two or more substances that are uniformly distributed

What is a compound?

• A type of plant
• A type of musical composition
• A type of clothing material
• A substance formed when two or more chemical elements are chemically bonded together

Tags

NGSS.MS-PS1-1

What is a pure substance?

• A material that has a constant composition and cannot be separated into simpler substances by physical means.
• A material that cannot be classified as a solid, liquid, or gas
• A substance that is a mixture of different elements and compounds
• A material with variable composition that can be separated into simpler substances by physical means

Tags

NGSS.MS-PS1-4

What's the definition of a solution?

• A type of problem
• Homogeneous mixture of two or more substances
• A solid substance
• A type of gas