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3 years ago

The big bang is through to have started by an?

Chemistry

1 answer:

aalyn [17]3 years ago

6 0

It was thought to have been started by an asteroid that hit earth and wiped out the dinosaurs.

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What is NaHCO3??? Explain.

jeka94

Answer:

Sodium hydrogen carbonate

7 0

2 years ago

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A certain flexible weather balloon contains 3.5 L of helium gas. Initially, the balloon is in WP at 8500ft, where the temperatur

Advocard [28]

Answer:

$\large \boxed{\text{3.9 L}}$

Explanation:

We can use the Combined Gas Laws to solve this problem

$\dfrac{p_{1}V_{1} }{T_{1}} = \dfrac{p_{2}V_{2}}{T_{2}}$

Data

p₁ = 571.2 Torr; p₂ = 400 Torr

V₁ = 3.5 L; V₂ = ?

T₁ = 21.5 °C; T₂ = 6.8 °C

Calculations

(a) Convert the temperatures to kelvins

T₁ = (21.55 + 273.15) K = 294.70 K

T₂ = (6.8 + 273.15) K = 279.95 K

(b) Calculate the new volume

$\begin{array}{rcl}\dfrac{p_{1}V_{1} }{T_{1}} & = & \dfrac{p_{2}V_{2}}{T_{2}}\\\\\dfrac{\text{571.2 Torr $\times$ 3.5 L}}{\text{294.65 K}} & = & \dfrac{\text{400 Torr} \times V_{2}}{\text{279.95 K}}\\\\\text{6.78 L} & = & \text{1.429V}_{2}\\\\V_{2} & = & \textbf{4.7 L}\\\end{array}\\\text{The new volume of the balloon is $\large \boxed{\textbf{4.7 L}}$}$

3 0

3 years ago

Read 2 more answers

What is the pressure inside a cylinder when the volume changes from 12.49 dm3 to 47.32 dm3 with an initial pressure of 7.257 x 1

zvonat [6]

Answer:

The pressure inside becomes : 202.646 KPa

Explanation:

Given ,

The temperature inside the cylinder is constant
The number of moles of the gas inside the cylinder will also be constant because it's a closed one.

Now according Boyle's law ,

The pressure of a gas of fixed mass is inversely proportional to its volume at a constant temperature.

Thus ,

$P_1V_1=P_2V_2\\$

$P_1$ is the initial pressure $7.257*102*10^3 Pa$
$P_2$ is what we need to find
$V_1 = 12.49dm^3$ - initial volume
$V_2 = 47.32dm^3$ - final volume

∴

$7.527*102*10^3*12.49=P_2*47.32\\P_2=2.02646*10^5Pa$

The pressure inside becomes : 202.646 KPa

4 0

3 years ago

A combination of substances that are not chemically combined is called a

Kitty [74]

Answer:

A mixture is a combination of two or more pure substances that are not chemically combined. Mixtures are held together by physical forces and therefore can be separated physically.

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3 years ago

What would be your reaction to a claim that a new element had been discovered, and it fit between tin (Sn) and antimony (Sb) in

Anton [14]

Answer:

As explained

Explanation:

My reaction will be positive and I will feel elated that a new elements has been discovered as this will be a modification of the earlier claim by berzelius and the likes that there are over 106 known elements ; Metal, Non Metals and Metalloids.

However, fitting the new discovered element in between Tin and antimony may be an issue, as the physical properties of the new elements has to be known, its melting point, metals or non metals as this is paramount to be able to classify the elements. if the elements fits in between tin and antimony, it is an indication that the elements is mot likely a metal or non-mental and may belong to group IVB or VB. Another issue is, the discoverer will have to create his own periodic table to be able to stand in with the discovery of Dimitriy Mendelev.

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4 years ago