CHEMISTRY HIGH SCHOOL

In most aqueous reactions as temperature increases, the effectiveness of collisions between reacting particlesA. decreases
B. increases
C.remains the same

Answers

Answer 1
Answer:

The reactions that occur in or in the presence of the water is called aqueous reactions. As the temperature increases, the collision of the particles also increases.

What kinetic energy and its relationship with temperature?

The increase of the temperature affects the collision rate of the particles which can be explained by the kinetic theory.  The increase in the temperature increases the collision of the particles.

The increased temperature increases the number of collisions and the kinetic energy that is enough to overcome the activation energy required by the particle to start the reaction.

Therefore, an increase in temperature option B. increases the particle collision.

Learn more about particle collision and kinetic theory here:

brainly.com/question/10209590
Answer 2
Answer: The more energy the more aqueous. Which can affect collision into increasing. Meaning B. increases :) 

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The student's experiment most likely demonstrates how... A. earthquakes occur along a fault
B. new crusts move at midocean ridges
C. tectonic movements cause hotspot volcanism
D. mountains are created along cracks in Earth plates

Answers

The right answer for the question that is being asked and shown above is that: "D. mountains are created along cracks in Earth plates."The student's experiment most likely demonstrates how D. mountains are created along cracks in Earth plates

Answer:d

Explanation:test

What quantity of magnesium (in grams) is needed to supply the energy required to warm 30 mL of water (density = 1.00 g/mL) from 22°C to 90°C?

Answers

Answer:

0.22 grams of magnesium

This seems too low, so check the calculations/

Explanation:

How is the heat delivered?  Is the magnesium hot and added to the water?  If so, at what temperature.

Is the heat generated from an exothermic chemical reaction?

=================

I'll assume here that the heat comes from the reaction of magnesium with water.  The balanced equation is:

   Mg + 2H2O = Mg(OH)2 + H2

It has a heat of reaction of  −924.7 kJ/mol.

We need enough Mg to heat 30 ml of water from 22°C to 90°C.  The specific heat of water is needed.  It is 4.184 J/g-K.  It tells us that 4.184 Joules are needed to raise the temperature of water by 1 degree K.

30 ml of water with density 1 gram/ml means we have 30 grams of water.  (We'll ignore the water that is added from the chemical reaction.).

Lets calculate the Joules required to raise 30 grams of water from 22°C to 90°C.  Note that the specific heat has units of g and Kelvin.  Since we need a temperature change, the number value for ΔT is the same for both °C and °K.  So the temperature change is +68°K.

We can now calculate the Joules required:  

(30 grams H2O)*(4.184 J/g-K)*(+68°K)  = 8535.4 Joules or 8.5 kJ to 2 sig figs.

The Mg/H2O  heat of reaction of  −924.7 kJ/mol. will allow us to calculate the amount of Mg needed to supply 8.5 kJ.  The minus sign tells us that the reaction RELEASES energy (the energy leaves the "system" of Mg and H2O).  

Calculate the moles of Mg needed to release 8.5 kJ:

   (924.7 kJ/mole)*(x moles) = 8.5 kJ

x moles = 0.0092 moles

Whoa.  That is only (0.0092 moles)*(24.03 g/mole) = 0.22 grams of magnesium

This seems low to me, so check on the heat of reaction figure I used.  And don't let the hydrogen get away.  

   

Which of the following would you expect to form an ionic bond when combined?. . .A. Ca and O. .B. N and O. C. Ca and Mg. . D. N and He

Answers

Ionic bonding is defined as the total transfer of valence electrons between atoms. What happens in ionic bonding is that a metal loses electrons to become a positive charged cation. On the other hand, the nonmetal receives those electrons to become a negatively charged anion. From the given choices above, the option that you would expect to form an ionic bond when combined is option A. Ca and O.

What is difference between creek,river and stream

Answers

the difference is size: you can step over a brook, jump over a creek, wade across a stream, and swim across a river. 

What is the mass of 3.0 x 10^23 atoms of neon

Answers

The mass of 3.0 x 10^23 atoms of neon would be 10.09 g

According to Avogadro;

1 mole of neon would have 6.022 x 10^23 atoms

3.0 x 10^23 atoms of neon would have:

            3.0 x 10^23/6.022 x 10^23

                                         = 0.5 moles

mass of 0.5 moles neon = mole x molar mass

                                            = 0.5 x 20.18

                                             = 10.09 g

More on Avogadro number can be found here: brainly.com/question/1445383?referrer=searchResults

Answer: The mass of neon for the given number of atoms will be 9.8 g.

Explanation:

We are given:

Number of neon atoms = 3.0* 10^(23)

According to the mole concept:

6.022* 10^(23) number of atoms. are occupied in 1 mole of a substance.

So, 3.0* 10^(23) will be occupied in = (1)/(6.022* 10^(23))* 3.0* 10^(23)=0.49moles

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Moles of Neon = 0.49 moles

Molar mass of neon = 20 g/mol

Putting values in above equation, we get:

0.49mol=\frac{\text{Mass of neon}}{20g/mol}\n\n\text{Mass of neon}=9.8g

Hence, the mass of neon for the given number of atoms will be 0.49g.

Which statement describes what occurs as two atoms of bromine combine to become a molecule of bromine?(1) Energy is absorbed as a bond is formed.
(2) Energy is absorbed as a bond is broken.
(3) Energy is released as a bond is formed.
(4) Energy is released as a bond is broken.

Answers

Answer:

The correct answer is option 3.

Explanation:

Whenever there is a formation of bond between 2 atoms energy is released. This energy release is due to stability gained by the atoms after the formation of a bond that is why extra energy is released as a heat into surroundings. Exact process is occurring when 2 bromine atoms form bond to give molecule of bromine.

Whenever there is a dissociation of bond between 2 atoms energy is given. The energy provided externally so as to break the stable bond present between the atoms.
Br + Br -> Br2 (covalent bond) 

forming of bonds releases energy, since the Br's are at a lower energy state as Br2

Answer is #3
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