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3 years ago

During which step in the Can Crush Lab did water vapor force air from the can?

1 answer:

3 0

When you heated the can with the bit of water inside and you boiled it over a flame, the water turned to vapor (gas) and the pressure in the inside of the can is different from the pressure on the outside of the can. When you placed the can into a ice water beaker or a container, the can shrunk it's size, decreasing it's mass and density. The can shrunk as a result of the inside pressure being equalized with the outside pressure.
The part where you placed it in the ice bath or container was when the water vapor was forced out of the can.

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natural rubidium has the average mass of 85.4678 and is composed of isotopes 85 Rb(mass = 84.9117) and 87 Rb. The ratio of atoms

mote1985 [20]

Answer:

Mass of Rb-87 is 86.913 amu.

Explanation:

Given data:

Average mass of rubidium = 85.4678 amu

Mass of Rb-85 = 84.9117

Ratio of 85Rb/87Rb in natural rubidium = 2.591

Mass of Rb = ?

Solution:

The ration of both isotope is 2.591 to 1. Which means that for 2.591 atoms of Rb-85 there is one Rb-87.

For 100% naturally occurring Rb = 2.591 + 1 = 3.591

% abundance of Rb-85 = 2.591/ 3.591 = 0.722

% abundance of Rb-87 = 1 - 0.722= 0.278

84.9117 × 0.722 + X × 0.278 = 85.4678

61.306 + X × 0.278 = 85.4678

X × 0.278 = 85.4678 - 61.306

X × 0.278 = 24.1618

X = 24.1618 / 0.278

X = 86.913 amu

8 0

3 years ago

Boyles Law-

My name is Ann [436]

Answer:

Boyles Law-

Variables that change: volume and pressure

Variables that remain constant: Temperature

Charles Law-

Variables that change: volume and temperature

Variables that remain constant: pressure

Explanation:

5 0

3 years ago

The electronegativity is 2.1 for h and 1.9 for pb. based on these electronegativities pbh4 would be expected to

Sedbober [7]

PbH4 will be formed as a result of a polar covalent bond between the H and the Pb.

Since H is more electronegative than the Pb, it is, thus, expected that the H would be able to pull the electron charge towards itself. This will result in the H being negative.

Based on this:
PbH4 would be expected to have polar covalent bonds with a partial negative charges on the H atoms.

8 0

3 years ago

in calorimetry, energy is measured through heat transfer from one substance to another. Which of the following is NOT a method o

aivan3 [116]

Answer:

Explanationconvection

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3 years ago

When you climb to the top of a water slide, you are gaining:

Annette [7]

Answer:

Explanation:

You climbing the water slide gives you potential energy and your building gravitational eneergy.

3 0

3 years ago