How do you determine the volume of an irregular object if you don't know the density?

Describe the contributions of 3 scientists to our current understanding of the atom

bogdanovich [222]

Answer:

1. Rutherford did the scattering experiment and observed that some of the rays bounce back. He concluded that there is a mass in which positive charge is concentrated. This marks the discovery of nucleus.

2. J.J Thomson discovered electrons by conducting cathode ray experiment.

3. Dalton postulated that matter is made up of small particles caled atoms

8 0

3 years ago

What characteristic odor would you expect to observe if an alcohol reacted with acidified ethanoic acid?

vovikov84 [41]

A vinegar-like smell would be the answer

mark me brainliest

6 0

3 years ago

A rigid cylinder with a movable piston contains a sample of gas. At 300. K, this sample has a pressure of 240. Kilopascals and a

iren [92.7K]

Answer:

The volume of this sample when the temperature is changed to 150 K and the pressure is changed to 160 kPa is 52.5 mL.

Explanation:

Boyle's law says that: "The volume occupied by a certain gaseous mass at constant temperature is inversely proportional to pressure" and is expressed mathematically as:

P * V = k

where k is a constant.

Charles's Law consists of the relationship that exists between the volume and the temperature of a certain quantity of ideal gas, which is maintained at a constant pressure, by means of a constant of proportionality that is applied directly. So Charles's law is a law that mathematically says that when the amount of gas and pressure are kept constant, the quotient that exists between the volume and the temperature will always have the same value:

$\frac{V}{T}=k$

Gay-Lussac's law states that the pressure of a fixed volume of a gas is directly proportional to its temperature. In other words, if the volume of a certain quantity of ideal gas remains constant, the quotient between pressure and temperature remains constant:

$\frac{P}{T}=k$

Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:

$\frac{P*V}{T}=k$

Considering an initial state 1 and a final state 2, it is satisfied:

$\frac{P1*V1}{T1}=\frac{P2*V2}{T2}$

In this case:

P1: 240 kPa
V1: 70 mL
T1: 300 K
P2: 160 kPa
V2: ?
T2: 150 K

Replacing:

$\frac{240 kPa*70 mL}{300 K}=\frac{160 kPa*V2}{150 K}$

Solving:

$V2=\frac{150 K}{160 kPa} *\frac{240 kPa*70 mL}{300 K}$

V2= 52.5 mL

<u><em>The volume of this sample when the temperature is changed to 150 K and the pressure is changed to 160 kPa is 52.5 mL.</em></u>

6 0

3 years ago

Read 2 more answers

A group of scientists are studying observable matter in a cluster of galaxies. They conclude that the cluster has only a small p

lidiya [134]

Answer:

it is because of Dark Matter

Dark Matter, component of the universe whose presence is discerned from its gravitational attraction rather than its luminosity. Dark matter makes up 30.1 percent of the matter-energy composition of the universe; the rest is dark energy (69.4 percent) and “ordinary” visible matter (0.5 percent).

Dark matter is composed of particles that do not absorb, reflect, or emit light, so they cannot be detected by observing electromagnetic radiation. Dark matter is material that cannot be seen directly.

Explanation:

Hope It helps

Have A Nice Day : )

5 0

2 years ago

According to Dalton’s atomic theory, atoms:

sammy [17]

Answer:

C

Explanation:

Dalton's atomic theory are: Everything is composed of atoms, which are the indivisible building blocks of matter and cannot be destroyed. All atoms of an element are identical. The atoms of different elements vary in size and mass.

6 0

3 years ago