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Brrunno [24]
3 years ago
6

What type of a reaction takes place when atoms or molecules rearrange to form new substances

Chemistry
2 answers:
GREYUIT [131]3 years ago
6 0
A chemical reaction happens when the atoms or molecules rearrange to form a new substance


zavuch27 [327]3 years ago
4 0

Explanation:

A reaction that bring changes in the chemical composition of its reactants then it is known as chemical reaction.

For example, C + O_{2} \rightarrow CO_{2}

When carbon and oxygen combine together then properties of both carbon and oxygen changes. Whereas properties of carbon dioxide is different from carbon and oxygen atom.

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Calculate the density of a sample of 1.00 mole of nh3 at 793mmhg and -9.00 c
xeze [42]

0.164 g/L is the density of a sample of 1.00 mole of NH_3 at 793mmhg and -9.00 degrees celcius.

<h3>What is density?</h3>

Density is the mass of a unit volume of a material substance. The formula for density is d = \frac{M}{V}, where d is density, M is mass, and V is volume.

Given data:

n = 1.00 mole

P=793 mm hg =1.04342 atm

T=-9.00 degree celcius = -9.00 + 273= 264 K

V=?

Using Ideal Gas Law equation:  

PV = n R T      

R = gas constant = 0.082057 L-atm/(mol-K)

(1.04342 atm)(V) = 5 X 0.082057 L-atm/(mol-K)  X 264 K

V = 103.67 Liters

Now calculate density:

Mole weight of NH_3 = 1.00 mole

So, the mass of NH_3 = 17.031 g

Density =  \frac{mass}{volume}  

Density =  \frac{17.031 g}{ 103.67 Liters}  

= 0.164 g/L

Hence, 0.164 g/L is the density of a sample of 1.00 mole of NH_3 at 793mmhg and -9.00 degrees celcius.

Learn more about the density here:

brainly.com/question/15164682

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8 0
2 years ago
Which description correctly characterizes the acidity or basicity of a solution? The higher the pH is, the more the hydroxide io
joja [24]

Answer:

The higher the pH is, the more the hydroxide ion concentration increases and the more basic the solution becomes.

Explanation:

  • When the pH of a solution is less than 7, then solution is called acidic and as the pH decreases the concentration of Hydronium ion increases.
  • When the pH is about 7, then the  solution is said to be neutral. On the other hand, when  the pH is greater than 7, the solution is is said to be basic and as the pH increases the concentration of Hydroxide ions increases.
  • Therefore, An acidic solution has a higher concentration of hydrogen ions compared to the concentration of hydroxide ions.
7 0
3 years ago
Read 2 more answers
How much heat will be absorbed by 395g of water when it's temperature is raised by 55°C​
Firdavs [7]

Answer:

\boxed{\text{91 kJ}}

Explanation:

The formula for the heat released is

q = mCΔT

Data:

 m = 395 g

 C = 4.184 J·°C⁻¹g⁻¹

ΔT = 55 °C

Calculations:

q = 395 × 4.184 × 55 = 91 000 J = 91 kJ

The water will absorb \boxed{\textbf{91 kJ}} of energy.

3 0
3 years ago
Would an atom of sodium and an atom of potassium join to form an ionic compound?
Sever21 [200]
No they wouldn't. <span>You can't make an </span>ionic compound<span> with these elements.</span>
7 0
4 years ago
Read 2 more answers
Why do elements that make positive ions occur on the left side of the periodic table while those that make negative ions occur o
Lynna [10]

Answer:

Elements in the same group have the same number of valence electrons.

Explanation: Science.

8 0
3 years ago
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