Answer:
See Explanation
Explanation:
The equation of the reaction is;
ZnO(s) + 2HNO3(aq) --------> Zn(NO3)2(aq) + H2O(l)
a) When you first add ZnO to aqueous HNO3, the powder dissolves as it mixes with the acid.
b) If the student keeps on adding more ZnO powder to the HNO3 after the reaction between the acid and metal oxide was complete, the powder will no longer dissolve in the acid. At this point, the reaction has attained equilibrium.
what is the ph of a 8.4x10^-6 M H+ solution?
Gold has a very low specific heat capacity, just 0.13 J/goC. If a gold class ring has a mass of 4 grams and is heated from 0oC to 100oC, what is the amount of energy the gold class ring has absorbed? a 52 Joules b 0.325 Joules c 400 Joules d 3076.92 Joules
Answer:
a 52 Joules
Explanation:
Specific heat capacity of Au = 0.13 J/g° C
mass = 4 gram
initial temperature = 0° C
final temperature = 100° C
We are to determine the amount of energy absorbed
Using the formula:
Q = mcΔθ
Q = 4 × (0.13) J/g° C ×(100-0)
Q = 52 Joules
Using Reaction A, how many grams of CO2 can be created from 5.67 moles of water?
127.6 g CO2
199.6 g CO2
81.65 g CO2
311.85 g CO2
Answer:
81.65 g CO2
Explanation:
What major component of water affects most its properties?
A. its abundance on Earth
B. its different states
C. polarity
D. its expansion when freezing
Answer:
C. polarity
Explanation:
Water is polar that is why it is a universal solvent.
What is the Molar mass of zinc
Answer:
65.38 u
Explanation:
hope this helps you out!!!!!!!
They Mean D and not U H just took the test and its D i hope this help
Which chemical equation is balanced as written?
PLS ANSWER FAST
Answer:
THERE ANSWER IS C
Explanation:
A solution of dispersant is made by taking 15.0 mL of a 50.0 mg/mL solution of Randyne and mixing it with 50.0 mL of water. Calculate the final concentration of the Randyne in this solution, in units of grams per milliliter.
Answer:
The final concentration of the Randyne in grams per milliliter = 0.011 g/mL
Explanation:
As we know
C1V1 = C2V2
C1 and C2 = concentration of solution 1 and 2 respectively
V1 and V2 = Volume of solution 1 and 2 respectively
Substituting the given values, we get -
[tex]50 * 15 = X * (15+50)\\X = 11.54[/tex] mg/mL
The final concentration of the Randyne in grams per milliliter = 0.011 g/mL
The final concentration of the Randyne in this solution is 0.01 g /mL.
How to calculate dilutions?It is very important to know the dilution methods in a chemistry lab. The dilution from the stock solution can be prepared by using the formula,
[tex]C_1V_1 = C_2V_2[/tex]
Where,
[tex]C_1[/tex]- concentration of the stock solution
[tex]V_1[/tex] - the volume of the stock solution
[tex]C_2[/tex] - concentration of the diluted solution
[tex]V_2[/tex] - the volume of diluted solution
Put the values in the formula,
[tex]50 \times 15 = C_2 \times 75 \\\\C_2 = \dfrac {750}{75 }\\\\C_2 = 10{\rm \ mg/mL \ \ \ or} \\\\ C_2 = 0.01 \rm \ g/mL[/tex]
Therefore, the final concentration of the Randyne in this solution is 0.01 g /mL.
Learn more about dilution methods:
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If the acid dissociation constant, Ka, for an acid HA is 8 x 104 at 25°C, what percent of the acid is dissociated
in a 0.50 M solution of HA at 25°C?
A
08%
Answer:
Percent dissociated = 3.92%
Explanation:
The equilibrium of the weak acid, HA, is:
HA ⇄ H⁺ + A⁻
Where Ka = 8x10⁻⁴ is: [H⁺] [A⁻] / [HA]
As both H⁺ and A⁻ comes from the same equilibrium we can write the concentrations of the species as follows:
[H⁺] = X
[A⁻] = X
[HA] = 0.50M - X
Where X is reaction coordinate
Replacing:
8x10⁻⁴ = X² / 0.50-X
4x10⁻⁴ - 8x10⁻⁴X - X² = 0
Solving for X:
X = -0.02M. False solution. There is no negative concentrations
X = 0.0196M. Right solution.
Replacing:
[A⁻] = 0.0196M
Percent of the acid that is dissociated is:
[A⁻] / [HA]₀ * 100
[HA]₀ is its initial concentration = 0.50M
0.0196M / 0.50M * 100
Percent dissociated = 3.92%someone help me with this please, it’s overdue:(
Answer:
See explanation.
Explanation:
Hello there!
3. In this case, according to the given question, it turns out possible for us to say that any chemical formula, for an ionic compound, has the cation (positive) on the left and the anion (negative) on the right; thus, since Mg is a metal, which tends to lose electrons and become positively charged whereas the Cl is a nonmetal, which tends to gain electrons and become negatively charged, we have the following:
[tex]Mg^{2+}Cl^-\\\\Mg^{2+}Cl^-_2\\\\MgCl_2[/tex]
4. In this case, since lithium is a metal, as well as magnesium, it is not possible for them to switch around their charges as they will not be bonded because they will be repelled rather than attracted because of their equal positive charges.
Regards!
In a nuclear equation:??
Scientist use models of the solar system to
1 avoid the use of incorrect data
2 prevent duplication of their ideals
3 help explain their ideas
4 make theories non-testable
The candle is lit and dilute ethanoic acid is poured down the inside of the beaker. As the acid reacts with the baking soda, bubbles of CO2 gas form. After a few seconds
the air in the beaker is replaced by 0.20 liter of CO2 gas, causing candle flame to go out. The density of CO2 gas is 1.8 grams per liter at room temperature.
Choose the correct structural formula for the acid that was poured into the beaker.
Answer:
It’s answer #2
Explanation:
I only know this because i just got it wrong
The correct structural formula for the acid that is poured into the beaker is CH₃COOH.
What is acetic acid?Acetic acid is also called ethanoic acid. It is form as a byproduct of fermentation. It forms vinegar. Vinegar is 4 to 6% acetic acid with water.
It is widely used in homes as cleaning agent, in cooking, washing etc.
Thus, the correct option is 2, CH₃COOH.
Learn more about acetic acid
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Pls help I’ll brainlest and add extra points
Answer:
a top predator, fighting
Which
gas is exchanged in the air sac of
longs? -
oxygen and nitrogen
oxygen and carbondioxide
O nitrogen and coarbondioxide
oxygen and hydrogen
O
Other:
Answer:
oxygen and carbon dioxide.
hope this helps you
When water is boiling in a pot, heat energy is being transferred throughout the water by which type of heat transfer?
O Convection
O Conduction
O Radiation
Answer:
it would be Convection.
If you have 600g of nitroglycerin, how many moles do you have?
help please
Answer:
600
Explanation:
there's 1 mole in every nitroglycerin
I think
Identify the type fo reaction below: ____ N2+__H2→ __NH3 synthesis or double replacement
Answer:
Synthesis or combination.
Explanation:
Hello there!
In this case, according to the given chart containing the types of reactions, it turns out possible for us infer this given reaction:
____ N2+__H2→ __NH3
Is synthesis or combination, because it follows the pattern A + B --> C. Moreover, it can be balanced as shown below:
N2+3H2→ 2NH3
Regards!
All of the following are examples of human organs EXCEPT the
1.heart
2.eyelashes.
3.skin
4. brain
It for science
Answer:
eyelashes are not a part of the the human organs
The main biochemical components of living things are ___
Answer:
Amines ketones aldehydes and aromatic
Explanation:
my opinion but thats my answer
240 g of water (specific heat = 4.186 J/g°C, initial temperature = 20°C) is mixed with an
unknown mass of iron (specific heat = 0.444 J/gºC, initial temperature 500°C). When
equilibrium is reached, the system has a temperature of 42°С. Find the mass of iron.
240 g of water (specific heat = 4.186 J/g°C, initial temperature = 20°C) is mixed with an unknown mass of iron (specific heat = 0.444 J/gºC, initial temperature 500°C). When equilibrium is reached,The answer for this would be 69.6
How do you find final temperature with specific heat?
You use q = mcΔT, but you assume aluminum = water and crack for This the final temperature.
We need to look up heat values (c) for aluminum and h20. This will uses 0.901 for aluminum and 4.18 use water
: (10)(130 - T)(0.901) = (200.0)(T - 25 (6)
Hence, The answer for this would be 69.6.
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What is the reason for heat transfer from one substance to another?
Answer:
Difference in temperature
Explanation:
According to thermodynamics, heat transfer occurs when heat from a high temperature reservoir moves to a low temperature reservoir. For heat to be transferred, the two objects should have different temperatures with one having more temperature than the other. Heat transfer in solids is by conduction, in fluids is by convection and by radiation.
which property of metal is used for making utensils??
Answer:
Metals are good conductors of heat. Due to this property metals are used in the preparation of kitchen utensils. Aluminium is good conductor of heat and more over it is corrosion resistent. Due to these properties aluminium is used in making kitchen utensils.
Explanation:
Helpppooo give answer thanks
Answer:
625 mL
Explanation:
From the question given above, the following data were obtained:
Volume of stock solution (V₁) = 250 mL
Molarity of stock solution (M₁) = 5 M
Molarity of diluted solution (M₂) = 2 M
Volume of diluted solution (V₂) =?
The volume of the diluted solution can be obtained by using the dilution formula as illustrated below:
M₁V₁ = M₂V₂
5 × 250 = 2 × V₂
1250 = 2 × V₂
Divide both side by 2
V₂ = 1250 / 2
V₂ = 625 mL
Therefore, the volume of the diluted solution is 625 mL.
How many valance electrons does He need to get to 8
Answer:
Any element in group 18 has eight valence electrons (except for helium, which has a total of just two electrons
Why when you get out of the pool, the cement pavement is hot compared to the pool water?
Answer: Water is a much better conductor of heat than air. So when you are surrounded by water, energy can flow from your body (conduction of heat) much more quickly than it would if you were surrounded by air at the same temperature.
what type of sugar has the largest surface area
a) powered/icing
b) raw
c) cubed
d) granulated
Answer:
d.) granulated
Because the granulated sugar has a greater surface area.
. Explain why some desert animals excrete uric acid rather than ammonia.
(2 marks)
Answer:
AFAIK
Explanation:
uric acid is much less toxic than ammonia, hence bigger concentrations of it are tolerated in the body. This means you can excrete it while excreting very little water - beneficial wherever water's not abundant.
There's a tradeoff though, uric acid requires more energy to synthesize than ammonia, so pretty much all fish, say, excrete ammonia rather than uric acid - it's no problem to dilute ammonia since there's no water shortage.
When looking across the periodic table from left to right, which of these groups are the first to contain nonmetals?
group 2
group 7
group 14
group 18
Answer:
The first group to contain a non-metal is Group 18.
2. All of the following statements are true regarding wood versus metal except: a) Wood has better electrical insulation which decreases with moisture content b) Wood structures dampen vibrations much better than metal, due to internal friction within the materials c) Under sustained loads wood stops to deform d) Wood has much better R value than metals
Answer:
All of the following statements are true regarding wood versus metal except:
c) Under sustained loads wood stops to deform
Explanation:
Wood is known to deform under stress. It undergoes warping, thereby, losing its original straight shape when its moisture unevenly dries up. Even concrete deforms under long-time loads. Similarly, wood, under sustained loads, experiences faster deformation than it ordinarily warps. To prevent further wood deformation, it must be treated, and its moisture dried up evenly.
In the coal-gasification process, carbon monoxide is converted to carbon dioxide via the following reaction: CO (g) H2O (g) CO2 (g) H2 (g) In an experiment, 0.35 mol of CO and 0.40 mol of H2O were placed in a 1.00-L reaction vessel. At equilibrium, there were 0.19 mol of CO remaining. Keq at the temperature of the experiment is __________. A) 5.47 B) 1.0 C) 1.78 D) 0.75 E) 0.56
Answer: [tex]K_{eq}[/tex] at the temperature of the experiment is 0.56.
Explanation:
Moles of [tex]CO[/tex] = 0.35 mole
Moles of [tex]H_2O[/tex] = 0.40 mole
Volume of solution = 1.00 L
Initial concentration of [tex]CO[/tex] = [tex]\frac{0.35mol}{1.00L}=0.35M[/tex]
Initial concentration of [tex]H_2O[/tex] = [tex]\frac{0.40mol}{1.00L}=0.40M[/tex]
Equilibrium concentration of [tex]CO[/tex] = [tex]\frac{0.19mol}{1.00L}=0.19M[/tex]
The given balanced equilibrium reaction is,
[tex]CO(g)+H_2O(g)\rightleftharpoons CO_2(g)+H_2(g)[/tex]
Initial conc. 0.35 M 0.40 M 0 M 0M
At eqm. conc. (0.35-x) M (0.40-x) M (x) M (x) M
Given: (0.35-x) = 0.19
x= 0.16 M
The expression for equilibrium constant for this reaction will be,
[tex]K_{eq}=\frac{[CO_2]\times [H_2]}{[CO]\times [H_2O]}[/tex]
Now put all the given values in this expression, we get :
[tex]K_{eq}=\frac{0.16\times 0.16}{(0.35-0.16)\times (0.40-0.16)}[/tex]
[tex]K_{eq}=\frac{0.16\times 0.16}{(0.19)\times (0.24)}=0.56[/tex]
Thus [tex]K_{eq}[/tex] at the temperature of the experiment is 0.56.