CHEMISTRY HIGH SCHOOL

For gamma radiation, what stops its penetrating abilities?

Answers

Answer 1
Answer: lead, concrete or steel. Gamma rays have a very small wavelength and therefore can penetrate most objects including walls, windows and the like. To fully protect an object inside an enclosure, heavily reinforced feet of concrete, steel and/or lead should be sufficient.
Answer 2
Answer:

Answer:

YES! The answer is LEAD  (PLATO)

Explanation:

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Look up the density of n-butyl chloride (1-chlorobutane). Assume that this alkyl halide was prepared instead of the bromide. Decide whether the alkyl chloride would appear as the upper or the lower phase at each stage of the separation procedure: after the reflux, after the addition of water, and after the addition of sodium bicarbonate.

Answers

Answer:

See explanation below

Explanation:

First, you need to know the density of each compound in order to know this.

The density of 1-chlorobutane is 0.88 g/mL,

The density of water is 1 g/mL

The density of sodium bicarbonate is 2.2 g/cm3.

therefore, the one that has a greater density will always go at the lower phase.

In this case, after the reflux, it will stay in the lower phase, basically because you don't have another solvent with a greater density than the butane.

After adding water, it will be in the upper phase, water has a greater density.

After adding bicarbonate, it will be in the upper phase too.

Under which conditions of temperature andpressure does a real gas behave most like an
ideal gas?
(1) 37 K and 1 atm (3) 347 K and 1 atm
(2) 37 K and 8 atm (4) 347 K and 8 atm

Answers

Ideal gas law is valid only for ideal gas not for vanderwaal gas.  The correct option is option C that is at  347 K and 1 atm, the real gas will behave as ideal gas.

What is ideal gas equation?

Ideal gas equation is the mathematical expression that relates pressure volume and temperature.

Mathematically the relation between Pressure, volume and temperature can be given as

PV=nRT

where,

P = pressure of ideal gas

V= volume of ideal gas

n =number of moles of ideal gas

T =temperature of ideal gas

R = Gas constant = 0.0821 L.atm/K.mol

If a real gas or vanderwaal gas wants to follow the above equation that gas has to be at high temperature and low pressure.

Therefore the correct option is option C that is at  347 K and 1 atm, the real gas will behave as ideal gas.

To learn more about ideal gas equation, here:

brainly.com/question/14826347

#SPJ2
(3) 347 K and 1 atm is the correct one because a real gas behaves most like an ideal gas at high temperature and low pressure.

How many liquids are found on the periodic table?



1

Answers

There are six liquids found on the periodic table.

1. Bromine

2. Mercury

3. Caesium

4. Gallium

5. Rubidium

6. Francium

If the atomic radius of a calcium crystal is 180 pm, what is the length of the edge of the unit cell? (the calcium crystal forms

Answers

The edge length of a a unit cell of calcium crystal is 509.12 pm.

Structure of the Calcium crystals

Calcium crystal has a face center cubic (FCC) structure.

Edge length of the unit cell

The edge length of the unit cell for face center cubic (FCC) structure is given in the following formula;

a = 2r√2

where;

  • a is edge length
  • r is the radius

a = 2 x 180 x √2

a = 509.12 pm

Thus, the edge length of a a unit cell of calcium crystal is 509.12 pm.

Learn more about edge length here: brainly.com/question/11796119
Calcium crystal has a face center cubic (FCC) structure. For FCC structure,
relation between edge length (a) and radius (r) is
                                                       a = 2√2 r
Given: r = 180 pm
Therefore, a = 2√2 180
                     = 2 x 1.141 x 180
                     = 410.76 pm

The length of the edge of the Ca unit cell is 410.76 pm.

 

A certain element has a melting point over 700 ∘C and a density less than 2.00 g/cm3. What is one possible identity for this element?

Answers

The only answer to an element that melts over 700 degrees Celcius and has a density of less than 2 g/cm3 is Beryllium. This element is rarely found anywhere in the entire universe. It's atomic number is 4 and it is created through stellar nucleosynthesis.
  The element is Beryllium

How many molecules are in 9.8 grams of calcium

Answers

Hmm
One mole of calcium is usually equal to 40 grams so divide 9.8 by 40 which would be 4.0 molecules 
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