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3 years ago

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Chemistry

2 answers:

____ [38]3 years ago

7 0

Answer: D. When temperature increases, particles move faster.

Explanation:

Rate of reaction is directly proportional to the temperature of a reaction.

Activation energy is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products.

Increasing the temperature means more particles can cross the energy barrier, because the kinetic energy of the particles increases , thus particles can move faster. More of them can undergo effective collisions. This leads to increase in the rate of the reaction.

JulijaS [17]3 years ago

4 0

Answer:

The answer would be D. when temperature increases, particles move faster.

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Assertion (A): Naphthalene balls disappear with time without leaving any solid.

gogolik [260]

Explanation:

a) Both A and R are true and R is the correct

explanation of A.

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2 years ago

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malfutka [58]

The answer would be d

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3 years ago

Determine the number of protons and neutrons in plutonium-239 and enter its symbol in the form azx.

Komok [63]

Answer:

number of protons: 94
number of neutrons: 145

239
       Pu
   94

Explanation:

1) The atomic number, Z, of plutonium is Z = 94, i.e plutonium 94 protons

2) Plutoniun-239 is the isotope with mass number 239.

3) Mass number = number of protons + number of neutrons =>

number of neutrons = mass number - number of protons = 239 - 94 = 145

4) The notation requires that you indicate the symbol of the element with the atomic number (number of protons) and the mass number.

You put the mass number as a superscript at the left side of the symbol and the atomic number as subscript to the left of the symbol.

So, in this case the symbol is Pu, the superscript to the left is 239 and the subscript to the left is 94.

239
       Pu
   94

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3 years ago

Dmitri Mendeleev's Periodic Law states that chemical and physical properties repeat themselves in groups of _____. A. 4 B. 8 C.

krok68 [10]

Dmitri Mendeleev's Periodic Law states that chemical and physical properties repeat themselves in groups of 8.

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4 years ago

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What is the molar concentration (in moles/L) of a solution made with 3.744 g of Mg(NO3)2 dissolved in enough water to make 50.0

Annette [7]

Answer:

The molar concentration of a solution made with 3.744 g of Mg(NO₃)₂ dissolved in enough water to make 50.0 mL of solution is $0.5 \frac{moles}{L}$

Explanation:

Molarity or Molar Concentration is the number of moles of solute that are dissolved in a certain volume.

The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:

$molarity=\frac{number of moles}{volume}$

In this case:

Mg: 24.3 g/mole
N: 14 g/mole
O: 16 g/mole

So, the molar mass of Mg(NO₃)₂ is:

Mg(NO₃)₂= 24.3 g/mole + 2*(14 g/mole + 3*16 g/mole)= 148.3 g/mole

So, if you have 3.744 g of Mg(NO₃)₂, you can apply the following rule of three: if 148.3 grams of Mg(NO₃)₂ are present in 1 mole, 3.744 grams in how many moles are present?

$moles=\frac{3.744 grams*1mole}{148.3 grams}$

moles= 0.025

Then you have:

number of moles=0.025
volume= 50 mL= 0.05 L (being 1,000 mL= 1 L)

Replacing in the definition of molarity:

$molarity=\frac{0.025 moles}{0.05 L}$

you get:

$molarity=0.5 \frac{moles}{L}$

The molar concentration of a solution made with 3.744 g of Mg(NO₃)₂ dissolved in enough water to make 50.0 mL of solution is $0.5 \frac{moles}{L}$

6 0

3 years ago

HELP PLEASE ** will give brainliest **

HELP PLEASE will give brainliest