Think about visiting the beach on a hot day. Predict whether sand or water has a higher specific heat and explain your prediction.

Answers

Answer 1

Answer:

Answer:

The sand has a higher specific heat

Explanation:

The answer is that the sand would have a higher specific heat than water because water requires a lot of heat to raise its temperature while sand needs less heat to change it as water has a high heat capacity that allows it to maintain its temperature within a range.

Answer 2

Answer: water has a higher SHC as it would be cooler than the sand meaning it requires more energy to reach the same temperature

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How many total atoms are in 0.380 g of P2O5

Answers

The gram formula mass of P2O5 is 31*2 + 16*5 =142. The mole number of P2O5 is 0.380/142=0.00268 mol. There is 7 atom in one P2O5 molecule. And there is 6.02 * 10^23 molecule per mol. So the answer is 1.13*10^22 atoms.

#1: Which of the following is an exothermic reaction? A. dissolving ammonium nitrate in water to cool the water B. condensation C. melting ice D. dissolving sugar in water. #2: Two objects (A and B) of the same temperature are in contact with each other. Which of the following statements is true? A. Heat transfers from object B to object A, because molecules from B collide with those from A. B. Heat transfers from object A to object B, because molecules from A collide with those from B. C. Although the molecules collide, no heat transfers because there is no temperature difference between the objects. D. No heat transfers, because there are no collisions between the molecules of the objects. #3: Which of the following parameters is kept constant in a coffee-cup calorimeter? A. temperature B. volume C. pressure D. kinetic energy #4: What type of substance would be best for use in a heating system? A. a liquid with a high specific heat B. a solid with a high specific heat C. a liquid with a low specific heat D. a gas with a low specific heat. #5: The reaction 2 NO(g) → N2(g) + O2(g) has a ΔH = -180.5 kJ. How much heat will be required to produce 44.8 L of NO by the reverse reaction? A. 644 kJ B. 180.5 kJ C. 301 kJ D. 322.3 kJ

Answers

These are the following answers to the five questions:
(1) (B) condensation. Condensation is exothermic, but it's not a reaction, it's a physical change.
(2) (C) Although the molecules collide, no heat transfers because there is no temperature difference between the objects.
(3) (C) pressure
(4) (A) a liquid with a high specific heat
(5) Supposing the NO is measured at STP:
(44.8 L) / (22.4 L/mol) x (180.5 kJ / 2 mol NO) = (B) 180.5 J

(1) (B) condensation. Condensation is exothermic, but it's not a reaction, it's a physical change.

(2) (C) Although the molecules collide, no heat transfers because there is no temperature difference between the objects.

(3) (C) pressure

(4) (A) a liquid with a high specific heat

(5) Supposing the NO is measured at STP:

(44.8 L) / (22.4 L/mol) x (180.5 kJ / 2 mol NO) = (B) 180.5 J

Which is the correct expression for Keq when the chemical reaction is as follows:N2 + 3H2 2NH3.

Answers

Answer : The expression for equilibrium constant will be,

$K_(eq)=\fac{[NH_3]^2}{[N_2][H_2]^3}$

Explanation :

Equilibrium constant : It is defined as the number of ratio of the concentration between the products and the reactants at equilibrium.

The equilibrium reaction is,

$aX+bY\rightleftharpoons cW+dZ$

The general expression for equilibrium constant will be,

$K_(eq)=([X]^a[Y]^b)/([W]^c[Z]^d)$

The given balanced chemical reaction will be,

$N_2+3H_2\rightleftharpoons 2NH_3$

The expression for equilibrium constant will be,

$K_(eq)=([NH_3]^2)/([N_2][H_2]^3)$

The expression of the Keq is [NH3]2/([N2][H2]3). The common formula of reaction: ax+by=cz is Keq - [z]c/([x]a*[y]b). Remember to use a balanced chemical reaction.

Near the surface of a liquid, fast-moving particles can break free and become a gas. a. True
b. False

Answers

This statement is True! Lets think about it... When water boils, the water doesnt evaporate from the bottom of the bowl it evaporates from the top!
=)

The following balanced equation shows the decomposition of water (H2O). According to the equation, how many oxygen atoms are in the reactants? 2 H2O 2H2 + O2

Answers

Answer: There are 2 oxygen atoms on the reactant side.

Explanation:

Every balanced chemical equation follows law of conservation of mass.

This law states that mass can neither be created nor be destroyed, but it can only be transformed from one form to another form.

This law also means that total number of individual atoms on the reactant side will always be equal to the total number of individual atoms on the product side.

The given balanced chemical equation follows:

$2H_2O\rightarrow 2H_2+O_2$

On reactant side:

Number of hydrogen atoms = 4

Number of oxygen atoms = 2

On product side:

Number of hydrogen atoms = 4

Number of oxygen atoms = 2

Hence, the number of oxygen atoms on the reactant side is equal to 2.

The following balanced equation, 2H2O = 2H2 +O2, shows the decomposition of water (H2O). According to the equation, there are two oxygen atoms in the reactants and another two oxygen atoms in the product side.

What are the differences between synthesis and decomposition reactions

Answers

Answer:

Explanation:

synthesis reaction have 2 or more reactants and produce only 1 product.

Example

2 Na + S --> Na2S

Decomposition reactions are the opposite. they have 1 reactant that is broken down into 2 or more products

Na2S ---> 2 Na + S

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