Answer:
True
Explanation:
50.0 ml of 2.60 M HBr(aq) was exactly neutralized (final pH=7) by a 1.80 M solution of NaOH(aq). How much volume of of the NaOH solution was added ?
Answer:
72.2 ml
Explanation:
The neutralization equation between HBr (acid) and NaOH (base) is the following:
HBr(aq) + NaOH(aq) → NaBr(aq) + H₂O(l)
We can see that 1 mol of HBr reacts with 1 mol of NaOH. At the equivalence point, the total number of moles of HBr reacts with the total number of moles of NaOH. The number of moles can be calculated as the product between the molarity (M, in mol/L) and the volume (V). So, we can equal the quantities of acid and base, as follows:
moles HBr = moles NaOH
M(HBr) x V(HBr) = M(NaOH) x V(NaOH)
Now, we calculate the volume of NaOH with the data:
V(NaOH)= M(HBr) x V(HBr)/M(NaOH)
= (2.60 mol/L x 50.0 ml)/(1.80 mol/L)
=72.2 ml
I need help on this please
thanks
Answer:
D. The flesh should return to normal after you press it.
Explanation:
The water content stored in the flesh of the fish, paired with the elasticity are both indicators of freshness, and will cause the flesh to return to normal after its been pressed.
9. Carbon-14 has a half-life of 5,730 years. How many years have passed after 3
half-lives?
Answer:
120 gram sample of a radioactive element, how many grams of that element will be left after 3 half-lives have passed? If you have a 300
Explanation:
Hope this helps!
What does a secondary consumer eat? Immersive Reader
Answer:
primary consumers and sometimes plants
What is the electron configuration for an Atom that has 13 electrons
4.) The temperature of solid silver increases from 30C to 40C by the addition of 117.5
joules of heat. What is the mass of the silver?
Answer:
The mass of silver is 49 g (0.049 kg).
Explanation:
Initial temperature = [tex]30^{o}[/tex]C
Final temperature = [tex]40^{o}[/tex]C
Quantity of heat required = 117.5 J
Specific heat capacity of silver = 0.240 J/g[tex]^{o} C[/tex]
mass of the silver can be determined by;
Q = mcΔθ
Where: Q is the quantity of heat required, m is the mass of substance, c is the specific heat capacity of the substance and Δθ is the change in temperature.
So that,
117.5 = m x 0.240 x (40 - 30)
117.5 = m x 0.24 x 10
= 2.4m
m = [tex]\frac{117.5}{2.4}[/tex]
= 48.9583
m ≅
m = 49 g
The mass of silver is 49 g (0.049 kg).
When 5.0g of NH4CLO4 is added to 100mL of water in a calorimeter, the temperature of the solution formed decreases by 3.0C?
Answer:
24.7 C
Explanation:
I don't know how
The final temperature of 1000 ml water by the addition of 5 g ammonium perchlorate has been 24.7 degree Celsius.
With the addition of 5 g of ammonium perchlorate, the drop in temperature has been:
The addition of 5 g sample to 100 ml water has absorption of energy, that results in change in temperature of 3 degree Celsius.
The heat absorbed by sample has been given as:
Heat = mass × specific heat × change in temperature
Since, the same mass of sample has been added to 25 degree Celsius water, according to law of conservation, the change in density for both the changes has been equivalent.
The ratio of masses has been equivalent to the ratio of volume.
[tex]\rm \dfrac{Mass\;at\;1000\;ml}{Mass\;at\;100\;ml}\;=\;\dfrac{Volume\;at\;1000\;ml}{Volume\;at\;100\;ml}\\\\\\\dfrac{Mass\;at\;1000\;ml}{Mass\;at\;100\;ml}\;=\;\dfrac{1000\,ml}{100\;ml}\\\\\\\dfrac{Mass\;at\;1000\;ml}{Mass\;at\;100\;ml}\;=\;10[/tex]
Since, the mass at 100 ml and mass at 1000 ml has been equal, the heat absorbed by the sample has also been equal. Equating the values:
Mass at 100 ml × Specific heat × Change in temperature = Mass at 1000 ml × Specific heat × Change in temperature
[tex]\rm 3\;degree\;Celsius\;= \;\dfrac{Mass\;at\;1000\;ml}{Mass\;at\;100\;ml}\;\times\;Change\;in\;temperature\\\\3\;degree\;Celsius\;= \;10\;\times\;Change\;in\;temperature\\\\Change\;in\;temperature\;=\;\dfrac{3}{10}[/tex]
Change in temperature = 0.3 degree Celsius.
The initial temperature of water has been 25 degree Celsius. The change in temperature has been given by:
Change in temperature = Initial temperature - Final temperature
0.3 degree Celsius = 25 degree Celsius - Final temperature
Final temperature = 25 - 03 degree Celsius
Final temperature = 24.7 degree Celsius.
The final temperature of 1000 ml water by the addition of 5 g ammonium perchlorate has been 24.7 degree Celsius.
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Leila made herself a cup of hot chololate weighing 150 grams. If she started with 125 grams of milk, how many grams of hot chocolate mix did she add?
Answer:
150g-125g
=25 of hot chocolate mix
what are oil and waters properties of matter?
Answer:
Two other beneficial properties of the oil include the inhibition of corrosion of metal surfaces, such as steel, and the removal of dirt and detritus via detergency.
Properties of water include its chemical formula H2O, density, melting, boiling point & how one molecule of water has two hydrogen atoms covalently bonded to one oxygen atom.
How many liters are in 100g of CoCl2?
Answer:
0.77018342688495
Explanation:
I did this
please help i need to do good in this class
Answer:
Explanation:
di) number of protons is 12 for all, number of neutrons is 13 for mg- 25 and 14 for mg-26
The combustion of a sample of butane, C4H10 (lighter fluid), produced 2.46 grams of water.
2 C4H10 + 13O2 -------> 8CO2 + 10H2O
(a) How many moles of water formed?
(b) How many moles of butane burned?
(c) How many grams of butane burned?
(d) How much oxygen was used up in moles?
(e) How much oxygen was used up in grams?
a. 0.137
b. 0.0274
c. 1.5892 g
d. 0.1781
e. 5.6992 g
Further explanationGiven
Reaction
2 C4H10 + 13O2 -------> 8CO2 + 10H2O
2.46 g of water
Required
moles and mass
Solution
a. moles of water :
2.46 g : 18 g/mol = 0.137
b. moles of butane :
= 2/10 x mol water
= 2/10 x 0.137
= 0.0274
c. mass of butane :
= 0.0274 x 58 g/mol
= 1.5892 g
d. moles of oxygen :
= 13/2 x mol butane
= 13/2 x 0.0274
= 0.1781
e. mass of oxygen :
= 0.1781 x 32 g/mol
= 5.6992 g
0.137moles of water is formed, 0.0274 moles or 1.5892 g of butane burned and 0.1781 moles or 5.6992 g of O₂ is used.
What is combustion reaction?Those reaction in which fuel is oxidized by the oxygen molecules and produce carbon dioxide and water molecule.
Given chemical reaction is:
2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O
Given mass of water = 2.46 grams
Moles will be calculated as:
n = W/M, where
W = given mass
M = molar mass
(a) Moles of water formed is calculated as:
Moles of water n = 2.46g / 18 g/mol = 0.137moles
(b) From the stoichiometry of the reaction, it is clear that:
10 moles of water = produced by 2 moles of butane
0.137 moles of water = produced by 2/10×0.137=0.0274 moles of butane
(c) Weight of butane is calculated by using moles:
W = 0.0274 × 58 g/mol = 1.5892 g
(d) From the stoichiometry of the reaction, it is clear that:
2 moles of butane = react with 13 moles of O₂
0.027 moles of butane = react with 13/2×0.027=0.1781 moles of O₂
(e) Mass of oxygen is calculated as:
W = 0.1781 x 32 g/mol = 5.6992 g
Hence, (a) 0.137moles, (b) 0.0274 moles, (c) 1.5892 g, (d) 0.1781 moles and (e) 5.6992 g.
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ammonia gas cannot be collected in an erect gas jar?why?
Answer:
ammonia being lighter than air, is collected by downward displacement of air in an inverted gasjar
The gas jar is used to collect ammonia gas. This gas can be barely dissolved in water. As a result, the downward displacement of water does not gather it in the jar.
What is ammonia ?With the formula NH3, ammonia is a nitrogen and hydrogen inorganic chemical. Ammonia, the simplest pnictogen hydride and a stable binary hydride, is a colorless gas with a strong, pungent odor.
Because it is simpler to install inlets and outlets in one end of an erect gas jar than it is to install them on the side or the bottom, which are required for placement on a stable surface.
Ammonia is prepared in a laboratory by forcing air downward to collect the gas. Due to the high solubility of ammonia in water, it is impossible to collect ammonia gas over water.
Thus, The gas jar is used to collect ammonia gas.
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Does anyone know this ?Please I need help
Explanation:
Entropy refers to the degree of disorderliness of system. Basically it refers to how random a system is.
Gong through the options.
A. The phase change is from solid to liquid. Liquid has a greater degree of disorderliness compared to solid hence entropy is increasing.
B. The phase change is from solid to gas. Gas particles has a greater degree of disorderliness compared to solid hence entropy is increasing.
C. The phase change is from aqueous to liquid. Aqueous solutions has a greater degree of disorderliness compared to liquid hence entropy is decreasing.
D. The reactant side has; solid + gas. In the product side, there is only gas. The product side has a greater degree of disorderliness hence the entropy is increasing.
E. The entropy of the product is greater than the entropy of the reactants hence entropy is increasing.
F. The phase change is from aqueous to solid. Aqueous solutions has a greater degree of disorderliness compared to solid hence entropy is decreasing.
What must be done to calculate the enthalpy of reaction? Check all that apply. The first equation must be halved. The first equation must be reversed. The second equation must be halved. The second equation must be reversed. The third equation must be halved. The third equation must be reversed. What is the overall enthalpy of reaction? Delta.Hrxn = kJ
The overall enthalpy of the reaction has been obtained by reversing the second equation, and third equation must be halved. Thus, option D and E has been correct.
The complete reactions given in the question has been:
[tex]\rm C\;+\;O_2\;\rightarrow\;CO_2\\2\;CO\;+\;O_2\;\rightarrow\;2\;CO_2\\2\;H_2O\rightarrow\;2\;H_2\;+\;O_2[/tex]
The overall reaction has been:
[tex]\rm C\;+\;H_2O\;\rightarrow\;CO\;+\;H_2[/tex]
To obtain the overall enthalpy of the reaction, the intermediate reaction enthalpy has been arranged to give the overall equation.
The first equation has been in the correct sequence for the final reaction.
The second equation has been in in the same order to obtain the overall reaction. The CO has been the product, while carbon dioxide has been the reactant from equation 1. Thus, equation 2 has been reversed.
The third equation has 2 moles of water while the overall reaction has 1 mole of water. Thus, equation third has been halved.
Thus, to obtain the enthalpy of overall final reaction, the second equation must be reversed, and third equation must be halved. Thus, option D and E has been correct.
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What must be done to calculate the enthalpy of reaction? Check all that apply.
The first equation must be halved.
The first equation must be reversed.
The second equation must be halved.
✔️ The second equation must be reversed.✔️ The third equation must be halved. ✔️ The third equation must be reversed.What is the overall enthalpy of reaction?
ΔH[tex]rxn[/tex]= ✔️131.3 kJ
21.Electromagnetic radiation can take the form of which of the following types of waves
a.Heat
b.Light
c.Ultraviolet
d.All of the above
A scientist was studying a population of elephants. The first year, he counted a population of 80. Over the next eight
years, the population's numbers were 94, 100, 103, 110, 125, 120, 125, 120. What appears to be the carrying capacity
for this population?
0 120
0124
O 125
O 126
Answer:
The carrying capacity of this population would be 125 we know this because we see that this number occur multiple times and seems to be the tipping point after which the number of the population always go down
Answer:
The carrying capacity of this population would be 125 we know this because we see that this number occur multiple times and seems to be the tipping point after which the number of the population always go down
Explanation:
How does the number of protons compare to the number of
electrons in a canton
Answer: The number of protons in cation is more than the number of electrons
Explanation:
cations are positive ions that means that they lose electrons to be stable nd have electron configuration (atomic number ) equivalent to the preceding noble gas
as : sodium 11 , it loses on electron to be stable and its electron configuration is equivalent to neon 10
so ,the number of protons in cation is more than the number of electrons
i hope it helps!
Which two types of rock could form after other rock melts into liquid
magma?
6 of 10 QUESTIONS
Sedimentary
Metamorphic
Intrusive igneous
Extrusive igneous
Answer:
The answer is intrusive igneous and extrusive igneous.
Explanation:
I’ve done the question on A P E X
Turgor pressure can help plants move. Internal water pressure can cause -
Which of the following are properties of the oxides of non-
metals?
property 1
property 2
A
acidic
covalent
B.
acidic
ionic
С
basic
covalent
D
basic
ionic
(a)
(b)
(d)
Answer:
it is option A hope it helps
The properties of nonmetallic oxides include acidity and covalent character. Hence, option A is correct.
What are non-metals?Non - metals are elements in the rightmost side of the periodic table. Non -metals are mostly gases and some of them include, metalloids also. Non-metals are commonly electron -deficient and some of them are highly electronegative.
A compound shows covalent character, if the electrons are shared between the constituent atoms. Covalency increases from left to right in periodic table.
As the covalent character increases, acidity increases. Oxides of non-metals are electrophiles and acts as Lewis acids. They are all covalent compounds. Therefore, option A is correct.
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A Bunsen burner usually burns methane gas (CH4) using words, write the chemical equation for this reaction.
The general chemical equation for the complete combustion (or burning) of some hydrocarbon fuel is, in words, as follows:
hydrocarbon fuel and oxygen gas react to produce carbon dioxide gas and water vapor,
or, using chemical notation,
[tex]\mathrm{C_xH_y} + z\mathrm{O_2} \rightarrow \mathit{x}\mathrm{CO_2} + \frac{\mathit{y}}{2}\mathrm{H_2O}[/tex]
where
[tex]z = x + \frac{y}{4}.[/tex]
Don't worry if that looks daunting. In our case, we are given the identity of the fuel (methane, or CH₄), so our equations will be straightforward.
In words: Methane gas and oxygen gas react to produce carbon dioxide gas and water vapor (or methane gas + oxygen gas → carbon dioxide gas and water vapor).
In chemical notation:
[tex]\mathrm{CH_4}_{\text{(g)}} + 2\mathrm{O_2}_{\text{(g)}} \rightarrow \mathrm{CO_2}_{\text{(g)}} + 2\mathrm{H_2O}_{\text{(g)}}.[/tex]
While the Bohr model fails to show the true shape of the electron orbitals with in an atom, it is still used because it ?
Answer:
Is used to predict the spectra of hydrogen and hydrogen like species
Explanation:
The Bohr's model of the atom was propounded by Neis Bohr. In his theory, an atom is composed of quantized energy levels in which electrons may be found.
The transition of an electron between energy levels leads to the absorption or emission of energy in the form of a photon of visible light. The energy absorbed or emitted depends on the energy difference between the two energy levels.
The model is successful at predicting the electronic spectra of one electron species but totally fails when the specie has more than one electron. Also, the model fails to show the true shape of the electron orbitals within an atom.
Which action could cause a sample of liquid to boil?
A. Decreasing the temperature of the liquid
B. Decreasing the sample size of the liquid
C. Decreasing the pressure on the liquid
D. Decreasing the volume of the liquid
Hurry please
Answer:
B
Explanation:
Decreasing the sample size of the liquid
hope it helps!
If 5.3 moles of magnesium phosphate react with excess sodium chloride how many moles of magnesium chloride will be formed?
can someone help me convert these please !
what is the physical property to the temperature when a liquid begins to boil?
Answer:
The boiling point
Explanation:
The boiling point is the temperature where a liquid starts to boil.
Answer:
the boiling point.
Explanation:
Why does my hand get cold when I pick up a snowball?
Answer:
Cause snow is cold.
Explanation:
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The physical part of digestion is called?
a) digestion
b) mechanical digestion
c) chemical digestion
d) solubility
Answer:
mechanical digestion is the physical part of digestion
Answer:
mechanical digestion
Explanation:
Lead will float in water.
Actually, no. While their mass may be the same (1kg), the volume of lead is a lot smaller than that of feathers. As there is the same mass stuffed in a smaller space, it must be denser. The density of water is 1 g/cm3, so if the density of the lead is more than 1g/cm3, it has to sink