What is an ionice equation with phases for the following chemical reaction: 2HBr(aq)+BaOH2(aq)-->2H2O(l)BaBr2(aq)?

Answers

Answer 1
Answer: Molecular reaction 

2HBr(aq) Ba(OH)2 (aq) = 2H2O (l) BaBr2(aq) 


Ionic equation 

2H 2Br- Ba 2 2OH- --------> Ba 2 2Br - 2H2O 

Net ionic equation 

2H (aq) 2OH- (aq)- ---------> 2H2O (l)

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Which reaction occurs when hydrogen ions react with hydroxide ions to form water?A. substitution
B. saponification
C. ionization
D. neutralization

Answers

Answer: D. neutralization

Explanation:

1. Substitution reaction is defined as the reaction in which one atom replaces the other atom from the compound.

AB+C\rightarrow AC+B

2. Saponification is a reaction in which fatty acids are made to react with alkalis to form sodium salt of fatty acids called as soaps.

3. Ionization is a type of chemical reaction in which a substance ionizes when dissolved in water.

AB\rightarrow A^++B^-

4. Neutralization is a type of chemical reaction in which an acid reacts with base to produce salt and water.

BOH+HX\rightarrow BX+H_2O

The answer is D.This one is a bit tricky because it requires you to realize that H+ and OH- are, respectively, an acid and a base. That's why it's neutralization.

Which of the following is the smallest volume? (2 points) 2500 mL 250 cm3
2.5 x 10-2 L
25 m3

Answers

So to put them all in the same units we have 
2500 mL 
250 mL 
25mL 
2,500,000,000mL 

So the third one is the smallest
The third is the answer becuase you multiply

What volume, in Liters, of a 2.00 M KCl solution contains 2.5kg of KCl? Molar mass of KCl= 74.55g/mole

Answers

According to the molar concentration, volume in liters of 2 M KCl solution is 16.76 L.

What is molar concentration?

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.

Volume required is obtained by molarity formula as, 2×74.55/2500=1/V=0.05964

∴V=1/0.05964=16.67 L.

Thus, 16.67 L of  2 M KCl solution contains 2.5 kg of KCl.

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C_(m)=(n)/(V_(r))\n\nn=(m_(s))/(M)\n\nC_(m)=(m_(s))/(MV_(r)) \ \ \ |*MV_(r)\n\nC_(m)MV_(r)=m_(s) \ \ \ |:C_(m)M\n\nV_(r)=(m_(s))/(C_(m)M)\n\n\nm=2.5kg=2500g\nM=74.55(g)/(mol)\nC_(m)=2(mol)/(L)\n\nV_(r)=(2500g)/(2(mol)/(L)*74.55(g)/(mol))\approx16.77L

The solid and liquid phases of water can exist ina state of equilibrium at 1 atmosphere of pressure
and a temperature of
(1) 0°C (3) 273°C
(2) 100°C (4) 373°C

Answers

Answer: 0°C

Explanation:
Water undergoes phase changes at 1 atm pressure as follows:
Solidification, change from water to ice occurs at 0°C.
Evaporation, change from liquid to gas occurs at 100°C.

The amount of heat energy Q, used to heat up a substance depends on its mass m its specific heat capacity (s) and the change in temperatureΔTof the substance. Using dimensional method, find the expression for s is ( Given that [S]=[L^2T^-2−K^−1]) is
QmΔT
Q/mΔT
Qm/ΔT
m/QΔT

Answers

Answer:

J/(gK)

Explanation:

The equation for the energy, Q released or gained by a system of mass (m), specific heat capacity (s), and temperature change (ΔT) is given by:

Q = msΔT

Rearrange this to isolate c, the specific heat:

msΔT = Q

s = Q/(mΔT)

Q is energy and is commonly expressed in Joules (J).  We'll use this unit, but others such as calorie, kJ, BTU, etc., are possible.

m is the mass and is commonly expressed as grams (g).  Other units such as kg and even lbs are possible (but who uses English units in science?)  Let's select g.

ΔT is commonly expressed in Centigrade (C) or Kelvin (K).  OK, Fahrenheit(F) is also possible, but really?  We'll use K here.

Now put these units into the expression for s:

s = Q/(mΔT)

s = J/(gK)

Final answer:

The specific heat capacity of a substance, represented by the symbol 's', can be calculated using the equation s = Q/mΔT, where 'Q' is the heat energy, 'm' is the mass of the substance, and 'ΔT' is the change in temperature.

Explanation:

The specific heat capacity (s) is a property of a substance that determines how much heat energy (Q) it requires to change its temperature (ΔT). Mathematically, Q = msΔT. Therefore to find the expression for s, you should rearrange this equation to solve for s. This gives: s = Q/mΔT.

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In the reaction Mg (s) + 2HCl (aq) -> H2 (g) + MgCl2 (aq), how many grams of hydrogen gas will be produced from 300 milliliters of a 4 M HCl in an excess of Mg? Please show all work

Answers

Mg(s) + 2HCl(aq) = H₂(g) + MgCl₂(aq)

v=300 ml=0.3 l
c=4 mol/l

n(HCl)=vc

m(H₂)/M(H₂)=n(HCl)/2

m(H₂)=M(H₂)vc/2

m(H₂)=2.0g/mol·0.3 l · 4mol/l /2 = 1.2 g

1.2 grams of hydrogen gas will be produced