Answer:
The specific heat capacity is the heat or energy required to change one unit mass of a substance of a constant volume by 1 °C. The formula is Cv = Q / (ΔT ⨉ m)
Haley recorded several notes in her lab journal about the experiment. Which of her notes below is an interpretation of the data that she collected?
Answer:
picture
Explanation:
i need the picture
we need a picture to
answer this sire
PLEASE HELP!!!
Using the rules that you learned during the session, what is the answer to the following question?
55.78 * 23.7
Answers
1,321.986
1,321.99
1,322
1,320
Answer:
(d) 1,320
Explanation:
You want the product 55.78 × 23.7 rounded appropriately.
Significant figuresWhen a number has both an integer part and a decimal fraction, all of the digits are significant. Here, that means the first number has 4 significant figures, and the second number has 3 significant figures.
The number of significant figures in a product or quotient will be the least of the numbers of significant figures of the contributors. Here, the product can only have 3 significant figures.
55.78 × 23.7 = 1321.986 ≈ 1320 . . . . rounded to 3 sf
Using the rules for significant figures, the answer is 1320.
__
Additional comment
Generally, the rules for significant figures apply to quantities derived from measurements. They can also be applied to estimates, where the result of computation using numbers of different precision cannot have any more accuracy than the least precise contributor.
The other useful rule in this process is that the rounding is saved for the final answer. Intermediate results should be carried to the full precision available.
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What is the solubility of MgCO₃ in a solution that contains 0.080 M Mg²⁺ ions? (Ksp of MgCO₃ is 3.5 × 10⁻⁸)
Answer: 4.4 x 10^-7
Explanation:
The dissociation equation for this reaction is:
MgCO3 (s) → Mg+2 (aq) + CO3-2 (aq)
[tex]\text { So, } k_{s p}=(x+0.08) x[/tex] (Here 0.08 >>> x )
[tex]\begin{aligned}\Rightarrow 3.5 \times 10^{-8} &=0.08 \times x \\\Rightarrow x &=\frac{3.5}{0.08} \times 10^{-8} \\&=4.37 \times 10^{-7} \\\Rightarrow x & \approx 4.4 \times 10^{-7} \mathrm{~M}\end{aligned}[/tex]
So the solubility MgCO₃ in a solution that containing 0.080 M Mg²⁺ is 4.4 x 10^-7
How many molecules are in 0.400 moles of dinitrogen pentoxide
Explanation:
The number of moles of a substance is represented by the following formula:
n=NNA
where, n
is the number of moles of the substance, N
is the total number of molecules present in a substance, andNA
is the Avogadro constant.
The given compound is N2O5
So one mole of N2O5
contains 6.023×1023
numbers of molecules. Thus the 0.400
moles of N2O5
contains a number of molecules => 0.400moles×6.023×10^23
.
=> 2.41×10^23 molecules.
there are 2.41 thats the anwser
A sample of gold has a mass of 38.6 grams and a volume of 2cm. What is the density of gold?
mass of the sample gold= 38.6g
volume =
[tex]2 {cm}^{3} [/tex]
to find:the density of the gold.
solution:D = m/V
[tex]m = 38.6g[/tex]
[tex] = 0.0386kg[/tex]
[tex]v = 2 {cm}^{3} [/tex]
[tex] = 0.000002 {m}^{3} [/tex]
then substitute the values.
[tex]d = \frac{0.0386}{0.000002} [/tex]
[tex]d = 19300kg | {m}^{3} [/tex]
therefore, the density of the sample gold is 19300kg/m3
Based on the differences in electronegativities, with which atom is francium (Fr) most likely to form an ionic bond?
A. Fr-Cl = 2.46
B. Fr-Se =1.76
C. Fr- At = 1.50
D. Fr-l =1.96
An ionic bond will be most likely formed between francium and chlorine having an electronegativity difference of 2.46.
What is is an ionic bond?An ionic bond is formed between to atoms that have a high difference in electronegativity between them. We now have to look out for the atoms that have a very high electronegativity difference. That pair is most likely to form an ionic bond.
Hence, an ionic bond will be most likely formed between francium and chlorine having an electronegativity difference of 2.46.
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A student diluted 10.0 milliliters (mL) of a 9.00 Molar (M) HCl solution in order to prepare a 0.50 M solution for his organic extraction analysis.What quantity of water, in mL, was added to make the 0.50M HCl solution?
A: 150
B: 160
C: 170
D: 180
The quantity of water in mL that was added to make the solution is 170 mL (option C)
How to determine the volume of the diluted solution Volume of stock solution (V₁) = 10 mL Molarity of stock solution (M₁) = 9 MMolarity of diluted solution (M₂) = 0.5 MVolume of diluted solution (V₂) =?M₁V₁ = M₂V₂
9 × 10 = 0.5 × V₂
90 = 0.5 × V₂
Divide both side by 0.5
V₂ = 90 / 0.5
V₂ = 180 mL
How to determine the volume of the water Volume of stock solution (V₁) = 10 mL Volume of diluted solution (V₂) = 180 mL Volume of water added =?Volume of water added = V₂ – V₁
Volume of water added = 180 – 10
Volume of water added = 170 mL
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What is the molarity of a solution that has 175 g of LICI in 1085 mL of solution?
Answer:
3.8 M
Explanation:
Mole weight of LiCl = 6.94 + 35.45 = 42.39 ( from periodic table)
175 g of this is then 175 / 42.39 = 4.13 moles
4.13 moles / (1085/1000) = 3.8 M
what happens when muscle cells are triggered?
Answer:
When myocytes (aka muscle cells) are triggered at a certain point for awhile it can cause strain and pain throughout the muscle.
Determine the number of atoms in 30.0g of Ne
HELP ME OUT PLS!!!!!!!!!
All stars begin their life in a
O black hole
O main sequence
O protostar
O nebula
nebula
↪ExplanationAll stars start in a large cloud of dust and gas called a nebula. Gravity can pull some of the gas and dust in a nebula together, forming a proto-star. A star is born when the gas and dust from a nebula become so hot and dense that hydrogen atoms are smashed together to form helium.
hope this helps...
Step 1: Pick your favorite physical activity This can be almost anything! Try to pick an activity that you like to participate in, but you can pick anything you want. It could be hockey, tennis, wakeboarding, dancing, rock climbing, or even walking your dog! Almost ANY activity will work for this assignment. Step 2: Research the activity Get on the internet and learn about the activity you selected. Step 3: Write a brief report - 2 full paragraphs Be sure to include the following information in your report: - What activity you selected and why you selected it. - 2 health benefits of your activity. - 3 different muscles that your activity uses or "works out." - If participating in your activity presents any safety concerns. When you have finished your 2 full paragraphs, submit your assignment here!
Dancing is a physical activity which strengthens the abdominal and calf muscles as well as improves flexibility.
What is a physical activity?A physical activity is any activity which involves movement of the body in order to strengthen the muscles and to be physically fit.
Dancing is a physical activity which involves intricate and repeated movements of the body.
Dancing is beneficial because;
it helps to relieve stress it improves flexibility it builds muscle enduranceSome muscles involved in dancing include;
The abdominal muscles The quadricepsthe glutesSome risks in dancing include muscle injuries, dislocations and possibly fractures due to falls.
Therefore, a dancing routine strengthens the abdominal and calf muscles as well as improves flexibility.
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For the reaction 2N2O5(g) → 4NO2(g) + O2(g) which of the following expressions is equal to the rate of the reaction?
Answer:
Rate=k[N2O5]^2
Explanation:
It is more accurate to determine the rate law using experimental data instead of stoichiometry. The answer I just gave was derived from stoichiometry.
The correct expression for the rate of the reaction [tex]\rm 2N_2O_5(g) ---- > 4NO_2(g)[/tex]+ O2(g) is Rate = Δ[[tex]\rm N_2O_5[/tex]] / (2Δt). Therefore, the correct option is B.
In the chemical equation, 2 moles of [tex]\rm N_2O_5[/tex]result in 4 moles of [tex]\rm NO_2[/tex]. The rate expression for the reaction can be expressed on the basis of stoichiometry as follows:
Rate = -Δ[[tex]\rm N_2O_5[/tex]] / (2Δt)
Because of the stoichiometric coefficient of 2, this expression shows that the rate of reaction is equal to the rate of decomposition of [tex]\rm N_2O_5[/tex]divided by 2. Since [tex]\rm N_2O_5[/tex]is a reactant in the forward process, the negative sign means that its concentration is decreasing with time. ,
Therefore, the correct option is B.
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Your question is incomplete, most probably the complete question is:
For the reaction 2N2O5(g) → 4NO2(g) + O2(g) which of the following expressions is equal to the rate of the reaction?
A) Rate = -Δ[N2O5] / Δt
B) Rate = Δ[N2O5] / (2Δt)
C) Rate = -Δ[NO2] / Δt
D) Rate = Δ[NO2] / (4Δt)
2.Uranium-235 has a half-life of about 700 million years. If 1 kg of U-235 is put on a shelf in
a laboratory, how much of it will be left after 700 million years? (5 points)
Answer:
.5 kg
Explanation:
At the start of Uranium-235 there is a total of 1 kg. Uranium-235 half life is 700 million years, take 1kg ÷2 = 0.5kg after 1 half life.
Let's say another 700 million years go by that means you take 0.5kg and divide that by 2.
0.5kg÷2= 0.25 kg is left after 2 half lives.
Hope this helps good luck!
What are the names of the compounds below?
Answer:
See below ~
Explanation:
a. 3-hydroxy, 3-methyl hexaneb. 3-methyl butanolc. Methoxy methaned. Propoxy ethanee. Ethoxy methane#1
Here the functional group attached is OH(Alcohol) so we need to use -ol suffix
There are total 6 carbons in the straight chain .Naming should be started from functional group.At max there can be 4carbons in the chain then on left hand sideRight hand side is 2 carboned substituent i.e it's ethyl group
Hence the naming is
2-ethyl-2-methyl butanol#2
Start numbering from alcohol towards left end .
4 carbons chainPent prefix to be usedThe name is
3-methyl-butanol#3
O is at centre and two methyl groups are branched both sides
Methoxy Methane#4
O is at centre,left side propane ,right side methane
Propoxy ethane#5
Left side ethane,Centred O,Right side methyl.
Ethoxy methaneHELP!!! WILL MARK BRAINLIEST!!
The diagram below shows different positions of Earth and Mars around the sun.
Based on the diagram, which of these statements is correct?
Earth covers different areas in the same amount of time at position A and position B.
Earth covers a greater area in position A than in position B in the same amount of time.
Mars covers a greater area in position A than in position B in the same amount of time.
Mars covers the same area in the same amount of time at position A and position B.
Answer:
Earth covers a greater area in position A than in position B in the same amount of time.
Explanation:
Based on the diagram that shows different positions of Earth and Mars around the sun, it seems that this statement is correct:
Earth covers a greater area in position A than in position B in the same amount of time. (Covers as I understood it means "overshadowing" Mars)
How many moles of helium gas are present in a balloon with a volume of 950 ml a pressure of 3.47 atm and a temperature of 104 degrees celcius
Answer:
.107 moles
Explanation:
To find moles given the info above, we use a variation of the Ideal Gas Law,
mol = PV/RT, where P is in atm, V is in L, T is in K, and R is the gas constant
P=3.47 atmL= .950 LT= 377 KR= .08206mol= 3.47(.950) / 377(.08206)
=.107 moles H2Can marble turn back into limestone?
Answer:
the alteration of limestone by heat and pressure.
Explanation:
Answer:
YES :)
Explanation:
How does marble turn back into Limestone?
»MARBLE is a Metharopic rock formed by the alternation of Limestone by heat and pressure
»The calcite in the limestone changes and fosills and layering in the original limestone disappear as interlocking grains grow.
»If the limestone is pure ,a white marble is formed
what major organic product would you expect to obtain when acetic anhydride reacts with ch3ch2ch2oh nh3
The major product of the reaction between acetic anhydride and CH3CH2CH2OH is CH3COOCH2CH2CH3. While, the major product of the reaction between acetic anhydride and NH3 is CH3CONH2.
What is acetic anhydride?Acetic anhydride is the compound (CH3COO)2. It is a precursor for the synthesis of many organic compounds.
Now let us consider the use of acetic anhydride in synthesis. The major product of the reaction between acetic anhydride and CH3CH2CH2OH is CH3COOCH2CH2CH3. While, the major product of the reaction between acetic anhydride and NH3 is CH3CONH2.
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carbon dioxide gas is not important for life. Do you agree or disagree?Explain your answer.
Answer:
Disagree carbon dioxide is one of the most important elements as it is present in nearly everywhere in our environment. We are also made from carbon. Carbon dioxide is present in our oceans. It is the most stable element in the periodic table therefore all element are compared to carbon-12 to calculate the relative mass of it from the element's isotopes. It is so important that a slight increase of CO2 production and other greenhouse gas production has the Earth become warmer causing it to have drastically impact our environment and also affecting our future.
In an ecosystem ,carbon dioxide is important so as to maintain the carbon foot prints.
What is an ecosystem?
Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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How many electrons are in an atom of nitrogen (N)?
The Periodic Table
A. 2
B. 7
C. 14
D. 5
Answer:
There are 7 electrons in the nitrogen atom two in k shell and 5 in l shell
Explanation:
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An excess of nitrogen reacts with 32.6 grams of hydrogen. What volume of ammonia is produced at STP? N2(g) + 3H2(g) 2NH3(g)?
the volume of ammonia produced at STP.
solution:Mass of hydrogen is 32.6g
Molar mass of H2 = 2 g/mol
Moles of H = 32.6g/2g/mol = 16.3mol
N2(g) + 3H2(g) —-> 2NH3(g)
The Mole ratio of H to NH3 is 3 : 1
32.6 mole of H = 1/3 x 16.3= 10.87 mol = 5.43mol
Moles of NH3 = 5.43mol
At STP moles = volume/molar volume, but molar volume = 22.4L/mol
Moles = volume/molar volume, volume = moles X molar volume
Volume = 5.43 mol x 22.4L/mol
= 121.63 L
Volume of NH3 = 121.63L
When 3.00 g of hydrogen reacts with 4.00 g of oxygen, 4.00 g of water is formed.
(a) What is the limiting reactant?
(b) What is the theoretical yield?
(c) What is the percent yield?
Question 11 options:
a)
(a) oxygen
(b) 4.51 g
(c) 88.7 %
b)
(a) hydrogen
(b) 4.51 g
(c) 88.7 %
c)
(a) oxygen
(b) 4.05 g
(c)13.0 %
d)
(a) hydrogen
(b) 4.05 g
(c) 13.0 %
Answer:
Answer A
Explanation:
2 H2 + O2 = 2 H2O
knowing the mole weights of these elements shows O2 is the limiting reactant in this situation.
4 g oxygen is 4 /31.998 = .125 mole O2
We should get two times these moles of water = .250 moles
weight = .250 (1.008 * 2 + 15.999) = 4.50 gm H20 (theoretical)
....but we only got 4 gm
4/4.50 = 88.8%
Which answer best describes this reaction?
C is bonded above, left, and below to H, and right to a second C bonded above and below to H and to the right to a third C. That third C is double bonded above right to O and below right to O bonded to H + H bonded to O bonded to C bonded above and below to H and to the right to C. Also bonded above, below, and to the right to H right arrow C is bonded above, left, and below to H, and right to a second C bonded above and below to H and to the right to a third C. That third C is double bonded above right to O and below right to O. That O is bonded to C bonded above and below to H and to the right to C, bonded above, below, and right to H + H Subscript 2 Baseline O.
formation of an ester by condensation
formation of an ether by condensation
formation of a new product using a substitution reaction
formation of a new product using an addition reaction
Answer:
formation of an ester by condensation
Explanation:
Edge 2022
Looking at the reaction sequence as described in the question, the ester can be said to be formed by condensation.
What is condensation?A condensation reaction is one in which a new compound is formed by the loss of a small molecule such as water from the two reacting compounds.
Looking at the reaction sequence as described in the question, the ester can be said to be formed by condensation. Hydrogen ion is lost from the first compound and -OH from the second one which is an instance of condensation.
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5. When you breathe, your lungs absorb oxygen
and release carbon dioxide. Which of these are
your lungs releasing?
(1) O
(2) O2
(3) CO
(4) CO2
(5) NH3
what is the chemical formula for flourine?
Answer:
H2(g) + F2(g) ----> 2HF(g)
Answer = F2
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In this food web, which organism eats meat-eaters?
A: 1
B: 6
C: 4
D: 3
Answer:
B.6
Explanation:
Organism is at the top and does not get eaten by anything else. That is why I think the correct answer is b :)
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How many moles of potassium chloride will be produced from 175 g of potassium chlorate?
Answer:
3.8 g
Explanation:
yan lng po maitutulong ko
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 2.34moles of potassium chloride will be produced from 175 g of potassium chlorate.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
mole =given mass ÷ molar mass
Molar mass of potassium chloride= 74.55 g/mol
Mass of potassium chloride= 175 g
Substituting the values in above formula we get
mole =175 g ÷ 74.55 g/mol
moles of potassium chloride=2.34moles
Therefore, 2.34moles of potassium chloride will be produced from 175 g of potassium chlorate.
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what is the molar mass of slicon
Answer:
28.0855 grams per mole
Matter is made of atoms that have positive centers of neutrons and protons
surrounded by a cloud of negatively charged electrons.
This statement is...
Answer:
the statement is a theory
Explanation: