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4 years ago

How do the properties of elements in the same column of the periodic table compare

1 answer:

4 0

The columns of the periodic table, also referred to as "groups" contain elements with similar reactive properties, due to these elements having a similar configuration of electrons in their outer shell.

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The power of the crane was 68600 W

Anika [276]

Answer:

t = 50 s

Explanation:

P = W/t

Solving for t,

t = W/P = (3430000 J)/(68600 Watts)

= 50 s

Note: 1 Watt = 1 J/s

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3 years ago

At room temperature, a melting solid produces a whitish liquid. A laser beam shined through the liquid is unaffected and produce

lisabon 2012 [21]

The liquid is transparent

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3 years ago

What has more<br> mass, a mole of<br> sodium chloride<br> or 2 moles of<br> aluminum?

eimsori [14]

Answer:

2 moles of aluminum

Explanation:

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3 years ago

What is the density of ammonia (NH3) at 273 K and 1.00 atm? 0.7601 g/L 0.982 g/L 1.23 g/L 2.43 g/L

lisov135 [29]

Answer:The density of ammonia ( $NH_3$ ) at 273 K and 1.00 atm is 0.75 g/L.

Explanation:

Temperature of the gas = T = 273 k

Pressure exerted by the gas,P = 1.00 atm

Volume occupied by the gas = V

Number of moles of gas = n

PV=nRT (Ideal gas equation)

$PV=\frac{\text{Mass of ammonia gas}}{\text{Molar mass of the ammonia}}$

$\frac{P\times \text{Molar mass of ammonia}}{RT}=\frac{\text{Mass of ammonia gas}}{V}=\text{Density of the gas}$

Density of the gas:

$\frac{1 atm\times 17 g/mol}{0.0820 L atm\mol K\times 273 K}=0.75 g/L$

The density of ammonia ( $NH_3$ ) at 273 K and 1.00 atm is 0.75 g/L.

8 0

3 years ago

1. What is a forensic palyn ologist?

NemiM [27]

Answer:

A forensic palynologist is a spore and pollen expert that helps solve crimes.

The case that Mildenhall worked on was about a murder that involved a prostitute. The police couldn’t find a trace to help solve the case, so they called Mildenhall to help with pollen clues. He was able to find trace evidence in the pollen, which helped police connect the victim to a gang hangout by the crime scene.

A forensic palynologist can help with a criminal investigation by comparing pollen from the suspect and the victim using a comparison microscope to determine if the pollen matches.

The challenges of using a forensic palynologist in a criminal investigation are that judges and juries may have a hard time understanding palynologists.

Explanation:

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3 years ago