When mixed, which states of matter form only a homogeneous mixture?
a. two liquids
b. two gases
c. a solid and a liquid
d. a liquid and a gas

The correct answer is b. two gases

The explanation:

-Mixtures can be either homogeneous or heterogeneous. A homogeneous mixture is a type of mixture in which the composition is uniform and every part of the solution has the same properties.\

- Examples of homogeneous mixtures include alloys and alcohol in water. A heterogeneous mixture is a type of mixture in which the components can be seen.

-One example of a mixture is air. Air is a homogeneous mixture of the gaseous substances nitrogen, oxygen, and smaller amounts of other substances.

B.two gases

Explanation: Homogeneous mixtures are mixtures in which dispersed phase is uniformly distributed throughout the dispersion medium and there is no physical boundary between the dispersed phase and dispersion medium.

Heterogeneous mixtures are mixtures in which dispersed phase is not uniformly distributed throughout the dispersion medium and there is a distinct physical boundary between the dispersed phase and dispersion medium.

a) Two liquids may or may not be completely miscible thus may form a homogeneous (milk and water)  or a heterogeneous mixture (oil and water).

b) Two gases always form a homogeneous mixture as there is large vacant spaces present between the molecules.

c) A solid and a liquid may or may not be completely miscible thus may form a homogeneous (salt and water)  or a heterogeneous mixture ( sand and water).

d) A liquid and a gas may or may not be completely miscible thus may form a homogeneous (river water)  or a heterogeneous mixture (perfume spray).

1.consider the following balanced equation and answer parts a through. show calculations for each part.  

3 ag(s) + 4 hno3(aq) → 3 agno3(aq) + no(g) + 2 h2o(l)  

a. calculate the number of moles of agno3 produced by the reaction of 3 moles of ag with excess hno3. if the number to the left of the compound represents the number of moles of the compound which are present, then 3 moles of ag react with 4 moles hno3 to produce 3 moles agno3 (aq).

so the answer to a would be 3 moles.

b. calculate the number of moles of agno3 produced by the reaction of 108 grams of ag with excess hno3.  

i'm not sure how to plug in the grams of silver into an equation using moles to find how many moles are produced.

c. calculate the number of grams of agno3 produced by the reaction of 108 grams of ag with excess hno3  

d. calculate the number of moles of no produced as a byproduct of the reaction of 108 grams of ag with excess hno3.  

e. calculate the number of grams of no produced as a byproduct starting with 108 grams of ag and excess hno3.  

explanation:

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.