2 years ago

I need to describe the organization of the periodic table

Chemistry

1 answer:

Leya [2.2K]2 years ago

4 0

Answer:

Elements are arranged from left to right and top to bottom in order of increasing atomic number

Explanation:

This is what I remember from Chemerstry a few years ago

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What length of time does the geologic time scale cover?

Nezavi [6.7K]

I would say you are correct so b 4.6

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3 years ago

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How many valence electrons does this atom have ? 1s^2 2s^2 2p^6 3s^2

tangare [24]

Answer

there is 2 electrons on that atoms

Explanation:

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3 years ago

) A children’s liquid cold medicine has a density of 1.23 g/mL. If a child is to take 2.5 tsp in a dose, what is the mass in gra

vekshin1

The relation between density and mass and volume is

$Density=\frac{Mass}{volume}$

the dose required is 2.5 tsp

each tsp contain 5mL

So dose required in mL = 2.5 X 5 = 12.5 mL

the mass will be calculated using following formula

$Mass=DensityXvolume$

$Mass=1.23\frac{g}{mL}X12.5mL= 15.38g$

The mass of dose in grams will be 15.38 g

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3 years ago

Increasing the temperature of a particular liquid from 298 K to 318 K causes its vapor pressure to double. What is the enthalpy

Delvig [45]

Answer:

27.3 kJ/mol

Explanation:

Step 1: Given data

Temperature 1 (T₁): 298 K

Vapor pressure 1 (P₁): P₁

Temperature 2 (T₂): 318 K

Vapor pressure 2 (P₂): 2 P₁

Step 2: Calculate the enthalpy of vaporization of this liquid

We will use the Clausius–Clapeyron equation.

ln (P₂/P₁) = -ΔHvap/R × (1/T₂ - 1/T₁)

ln 2 = -ΔHvap/(8.314 J/K.mol) × (1/318 K - 1/298 K)

ΔHvap = 2.73 × 10⁴ J/mol = 27.3 kJ/mol

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3 years ago

Pertain to the following class, Point:

Anton [14]

Answer:

Explanation:

b = 0;

this (x, y);

this(0, 0);

x = a;

y = b;

a =

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3 years ago