Determine the number of significant digits in each number and list the specific significant digits. 1. 306,000 2. 0.0073 3. 39.9999 4. 25.00 5. 40,000,021 6. 45,250.0 7. 0.00011 8. 420.030700
Answer:
1. 306,000: three significant figures because the last three zeros are not preceded by a decimal point.
2. 0.0073: two significant figures because the the leftmost zeros are not significant.
3. 39.9999: six significant figures because all these numbers are nonzero digits.
4. 25.00: four significant figures because right-handed zeros, after a decimal point, are significant.
5. 40,000,021: eight significant figures because intermediate zeros are significant.
6. 45,250.0: six significant figures because al the zeros are to the right of the nonzero digits.
7. 0.00011: two significant figures as well as #2.
8. 420.030700: nine significant figures because all the zeros are to the right of the first nonzero digits and after the decimal point.
Explanation:
Hello there!
In this case, by considering the given numbers, we can proceed as follows, by keeping in mind the rules for assigning significant figures:
1. 306,000: three significant figures because the last three zeros are not preceded by a decimal point.
2. 0.0073: two significant figures because the the leftmost zeros are not significant.
3. 39.9999: six significant figures because all these numbers are nonzero digits.
4. 25.00: four significant figures because right-handed zeros, after a decimal point, are significant.
5. 40,000,021: eight significant figures because intermediate zeros are significant.
6. 45,250.0: six significant figures because al the zeros are to the right of the nonzero digits.
7. 0.00011: two significant figures as well as #2.
8. 420.030700: nine significant figures because all the zeros are to the right of the first nonzero digits and after the decimal point.
Regards!
The chemical equation of the reaction between Hydrogen and Oxygen is given below
H2 + O2 → H2O
(a) Write down the reactants and product of this reaction
(b) This chemical equation is not balanced . Why?
(c) Balance the given equation
9. Consider the given unbalanced reaction
Na + O2 → Na2O
(a) Find out the mono atomic and diatomic molecules in this equation
(b) What is the chemical compound present in this equation
(c) Balance the given equation
Answer:
1. a. The reactants are H₂ and O₂; The product is H₂O
b. The equation is not balanced because the number of atoms of the elements reacting is not equal to the number of atoms produced. 2 atoms of oxygen reacted but only one atom of oxygen is produced.
c. 2 H₂ + O₂ ---> 2 H₂O
2. a. The monotonic molecule is the sodium molecule, Na, since itnis made up of only one atom in its molecule.
The diatomic molecule is oxygen molecule, O₂, since it is made up of two atoms in its molecule.
b. The chemical compound present is sodium oxide, Na₂O
c. 4 Na + O₂ ---> 2 Na₂O
Explanation:
In a chemical reaction, the reactants are the elements or compounds which are converted to a new substance whichnis known as the product. The products are the new substances formed from the reactants.
In the given equation of reaction below;
H₂ + O₂ ---> H₂O
a. The reactants are H₂ and O₂; The product is H₂O
b. The equation is not balanced because the number of atoms of the elements reacting is not equal to the number of atoms produced. 2 atoms of oxygen reacted but only one atom of oxygen is produced.
c. 2 H₂ + O₂ ---> 2 H₂O
2. Given the reaction equation below:
Na + O₂ ---> Na₂O
a. The monotonic molecule is the sodium molecule, Na, since it is made up of only one atom in its molecule.
The diatomic molecule is oxygen molecule, O₂, since it is made up of two atoms in its molecule.
b. The chemical compound present is sodium oxide, Na₂O since itconsists of two chemically combined elements, sodium and oxygen.
c. 4 Na + O₂ ---> 2 Na₂O
1. Express in conventional notation (no exponents) in the space provided within the
parentheses, state how many significant figures are in the number (apis, cach)
a) 3.2 X 102
b) 2.366 X 104
C) 7.30 x 101
d) 5.325 x 102
Answer:
a) 320: two significant figures.
b) 2,366: four significant figures.
c) 73.0: three significant figures.
d. 532.5: four significant figures.
Explanation:
Hello there!
In this case, according to the given information, it turns out possible for us to write each number by knowing we move the decimal places to the right as much as the exponent is, and also, we count every figure, even zeros, because they are to the right of the first nonzero digit:
a) 320: two significant figures because the rightmost zero is not preceded o followed by a decimal place.
b) 2,366: four significant figures.
c) 73.0: three significant figures, because the zero is followed by the decimal place.
d. 532.5: four significant figures.
Regards!
Based on the molecular formula, determine whether each of the following is an alkane, an alkene, or an alkyne. (Assume that all the compounds are noncyclic and do not contain more than one multiple bond.)
Drag the appropriate compounds to their respective bins.
a. C8H16
b. C4H6
c. C7H16
d. C2H2
Answer:
a. Alkene
b. Alkyne
c. Alkane
d. Alkyne
Explanation:
Hydrocarbons can be:
Alkanes: all single bonds. Have the general formula CₙH₂ₙ₊₂.Alkenes: have a double bond. Have the general formula CₙH₂ₙ.Alkynes: have a triple bond. Have the formula CₙH₂ₙ₋₂.a. C₈H₁₆
Alkene. n = 8 and 2n = 2.8 = 16,
b. C₄H₆
Alkyne. n = 4 and 2n-2 = 2.4-2 = 6.
c. C₇H₁₆
Alkane. n = 7 and 2n+2 = 2.7+2 = 16.
d. C₂H₂
Alkyne. n = 2 and 2n-2 = 2.2-2 = 2.
What is the reduction half-reaction for the equation below?
5Fe2+(aq) + MnO4" (aq) + 8H+(aq) → 5Fe3+ (aq) + Mn2+(aq) +
4H2O(1)
Answer:
[tex]MnO_4^-+8H^++5e^-\rightarrow Mn^{2+}+4H_2O[/tex]
Explanation:
Hello there!
In this case, since redox reactions are characterized by the presence of a reduction reaction, whereby the oxidation of the element decreases, and an oxidation reaction whereby the oxidation of the element increases.
In such a way, for the given chemical equation, we can see Fe is increasing its oxidation state from 2+ to 3+, which means it is oxidized. On the flip side, Mn is being reduced from 7+ (MnO₄⁻) to 2+ and this, the reduction half-reaction is:
[tex]MnO_4^-+8H^++5e^-\rightarrow Mn^{2+}+4H_2O[/tex]
Whereas five electrons are carried.
Regards!
What’s the answer to the question
Answer: B
Explanation: im pretty sure my teacher mentioned something about N--h bonds are non polar
Answer:
C
Explanation:
What is the name of this compound?
Answer:
THERE IS NOTHING MENTION HERE HOW CAN ANYONE KNOW ABOUT IT?]
Explanation:
a sample of cobalt, A, with a mass of 5.00g, is initially at 25 C. When this sample gains 6.70 J of heat, the temperature rises to 27.9 C. Another sample of cobalt, B, with a mass of 7.00 g, iw initially at 25 C. If sample B gains 5.00 J of heat, what is the final temperature of sample B
Answer:
26.5°C
Explanation:
We can solve this question using the equation:
q = m*S*ΔT
Where Q is heat gained in joules, m is the mass of the sample, S is specific heat and ΔT change in temperature.
With the sample A we can find specific heat of cobalt in order to find, in sample B, the ΔT and the final temperature:
Sample A:
q = m*S*ΔT
6.70J = 5.00g*S*(27.9°C-25.0°C)
0.462J/g°C = Specific heat of cobalt
Sample B:
q = m*S*ΔT
5.00J = 7.00g*0.462J/g°C*ΔT
1.5°C = ΔT
As the initial temperature of sample B is 25°C, final temperature is:
25°C + 1.5°C = 26.5°C
You want to test how the mass of a reactant affect the speed of a reaction which of the following is an example of a controlled experiment to test this
Answer:A
Explanation:
Question:
What is the molar concentration of 1.29 mol of KCL dissolved in 350 mL of solution?
Answer:
M = 3.69 M.
Explanation:
Hello there!
In this case, according to the given information, it turns out possible for us to calculate the molar concentration of the 1.29 moles of KCl in 350 mL of solution by recalling the mathematical definition of molarity as the division of the moles by the volume in liters, in this case 0.350 L; thus, we proceed as follows:
[tex]M=\frac{1.29mol}{0.350L}\\\\M=3.69M[/tex]
Which gives molar units, M, or just mol/L.
Regards!
6. What happens to energy during the formation of a solution?
It is released or absorbed.
It is only absorbed.
It is only released
It is nelther released nor absorbed.
Answer:
it is released and absorbed:)
The engineering process defines the steps engineers take to create
technology. Which of these describes these steps in the correct order?
O A. Identifying a problem, making a solution, testing the solution,
mass production, making improvements
O B. Identifying a need, researching the background of that need,
making a plan to meet the need, doing the work, evaluating the
results, looking for improvements
C. Identifying a problem, testing various solutions, researching side
effects of each solution, choosing a solution, looking to improve
the solution, planning how to test the solution
D. Identifying a problem, brainstorming solutions, researching the
background of each solution, testing solutions, choosing a
solution, production, making future improvements
Answer:
A
Explanation:
The processes engineers take to build technology are outlined by the engineering process, which is defined as identifying a need, learning more about it, making a plan to meet it, putting into practice, evaluating the results, and looking for improvements. So, the correct option is B.
What is an Engineering process?Process engineering is described as the interpretation and application of the basic natural laws and principles that enable people to convert energy and materials into goods that are beneficial to society on an industrial scale.
The engineering process, which is defined as identifying a need, learning more about it, creating a plan to address it, putting the plan into practice, reviewing the outcomes, and seeking for improvements, provides an overview of the procedures engineers use to create technology.
Therefore, the correct option is B.
Learn more about Engineering process, here:
https://brainly.com/question/10175918
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2) Gay-Lussac's law shows a direct relationship between temperature and
O moles
pressure
O volume
O density
Answer:
The correct option is (b) "pressure".
Explanation:
Gay-Lussac's law states that the pressure of an ideal gas is directly proportional to its temperature at constant mass and volume.
Mathematically, Gay-Lussac's law is as follows :
[tex]P=kT[/tex]
or
[tex]\dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}[/tex]
Hence, the correct option is (b) "pressure".
What is the specific heat of a metal if it takes 26.5 calories to raise the temperature of a piece weighing 50.0 g by 5.00 Celsius degrees
Answer:
The specific heat of the metal is 0.106 [tex]\frac{cal}{g*C}[/tex]
Explanation:
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
There is a direct proportional relationship between heat and temperature. The constant of proportionality depends on the substance that constitutes the body as on its mass, and is the product of the specific heat by the mass of the body. So, the equation that allows calculating heat exchanges is:
Q = c * m * ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case:
Q= 26.5 cal (calories)c= ?m= 50 gΔT= 5 CReplacing:
26.5 cal= c* 50 g* 5 C
Solving:
[tex]c=\frac{26.5 cal}{50g*5 C}[/tex]
c= 0.106 [tex]\frac{cal}{g*C}[/tex]
The specific heat of the metal is 0.106 [tex]\frac{cal}{g*C}[/tex]
Arrange the following molecules in order of decreasing polarity of their bonds.
a. PBr3
b. SF2
c. H2O
d. NCl3
Answer:
SF2 > H2O > PBr3 > NCl3
Explanation:
Compare the electronegativity values for the atoms and classify the nature of the bonding based on the electronegativity difference.
P has an electronegativity of 2.1, while Br has an electronegativity of 2.96. The difference is 0.86, indicating that these atoms will form covalent bonds.
S has an electronegativity of 2.58 while F has an electronegativity of 4.0. The difference is 1.42, indicating that these atoms will form polar covalent bonds.
O has an electronegativity of 3.5 while H has an electronegativity of 2.1. The difference is 1.4, indicating that these atoms will form polar covalent bonds.
N has an electronegativity of 3.04, whereas Cl has an electronegativity of 3.5. This difference of 0.46 indicates that these atoms will form covalent bonds.
We know that the greater the electronegativity, the higher the polarity. In decreasing order of polarity, we have:
SF2 > H2O > PBr3 > NCl3
A 200. gram sample of a salt solution contains 0.050 grams of NaCl. What is the concentration of the
solution in parts per million (ppm)?
Answer:
2.5 × 10² ppm
Explanation:
Step 1: Given data
Mass of NaCl: 0.050 gMass of the sample: 200. gStep 2: Convert 0.050 g to μg
We will use the conversion factor 1 g = 10⁶ μg.
0.050 g × 10⁶ μg/1 g = 5.0 × 10⁴ μg
Step 3: Calculate the concentration of NaCl in ppm
The concentration of NaCl in ppm is equal to the micrograms of NaCl per gram of the sample.
5.0 × 10⁴ μg NaCl/200. g = 2.5 × 10² ppm
Answer:250 ppm
Explanation:
Aqueous potassium carbonate was mixed with aqueous copper (1) fluoride and a crystallized copper (1) carbonate product was formed. A crystalized product is a solid. The other product, potassium fluoride, remains dissolved in solution. Consider the other product and it’s phase, and then write the balanced molecular equation for this precipitation reaction. Express your answer as a chemical equation including phases. Type an underscore (_) or a carat (^) to add subscripts and superscripted more quickly.
Answer: The balanced molecular equation for the precipitation reaction is [tex]K_2CO_3(aq)+2CuF(aq)\rightarrow Cu_2CO_3(s)+2KF(aq)[/tex]
Explanation:
A precipitation reaction is defined as the reaction where a solid precipitate (solid substance) is formed at the end of the reaction. It is insoluble in water.
When potassium carbonate reacts with copper (I) fluoride, it leads to the formation of solid copper (I) carbonate and potassium fluoride solution.
The balanced chemical equation follows:
[tex]K_2CO_3(aq)+2CuF(aq)\rightarrow Cu_2CO_3(s)+2KF(aq)[/tex]
The precipitate formed is copper (I) carbonate
A student obtains a beaker containing a solution that is determined to have a hydrogen ion
concentration (H+) of 6.7x10-14. Based on this information, please answer the following
questions:
a) What is the pH of the solution?
b) is the solution acidic, neutral or basic?
Answer:
pH = 13.1
Basic
Explanation:
Step 1: Given data
Hydrogen ion concentration ([H⁺]): 6.7 × 10⁻¹⁴ M
Step 2: Calculate the pH of the solution
We will use the definition of pH.
pH = -log [H⁺]
pH = -log 6.7 × 10⁻¹⁴ = 13.1
When pH < 7, the solution is acid.When pH = 7, the solution is neutral.When pH > 7, the solution is basic.Since pH > 7, the solution is basic.
what will happen if atom hit earth with speed of light?
Answer:
A little atom will leave a big hole and a big atom cant travel that fast
Explanation:
what is the [H+] and [OH-] of a 3.5 M HCIO3 solution?
Answer: H+ ia helyuim
explinanation: Hope this helped!!
What is the mass of 0.1 mole of Cu(OH) 2 ?
Answer:
0.1
Explanation:
I know that because of the law of conservation of mass
Answer:9.6g
Explanation: thats the right answer
Give an example that illustrates the importance of chirality in a named biological molecule.
Answer:
Chirality is a particularly important concept in biology, because cells are mostly composed of chiral molecules. Small chiral molecules such as amino acids and sugars (figure 1, top) are the building blocks of larger molecules, such as proteins and nucleic acids, which are also chiral
By knowing the natural abundance of minor isotopes, it's possible to calculate the relative heights of M+ and M+1 peaks. If natural abundances are 12C - 98.9% and 13C - 1.10%, what are the relative heights, to the nearest 0.1%, of the M+ and M+1 peaks in the mass spectrum of cholesterol, C27H48O? Ignore the contributions of isotopes like 2H (deuterium; 0.015% natural abundance) and 17O (0.04% natural abundance) that are small. The relative heights are, in order of increasing mass: 100 to
Answer:
the relative height of M⁺ : M+1 is; 0.7418 : 0.2228
The relative heights are; In order of increasing mass 100 : 30
Explanation:
Given the data in the question;
The M⁺ peak comes from all ¹²₆C atoms
so, the probability in cholesterol, C₂₇H₄₈O is ( 98.9% )²⁷ = ( 0.989 )²⁷ = 0.7418
The M+1 peak comes from the isotopic carbon ¹³₆C.
so, the probability in cholesterol is ⇒ 1.10% × ( 98.9% )²⁶ = 0.011 × ( 0.989)²⁶
The probability for 27 carbons is ⇒ 27 × 0.011 × ( 0.989)²⁶ = 0.2228
Therefore, the relative height of M⁺ : M+1 is; 0.7418 : 0.2228
The relative heights are; In order of increasing mass 100 : 30
PLSSS HELP MEEEEEEEE
It takes 5 seconds for a wave with a wavelength of 0.4 m to travel past you.
What is the frequency of the wave?
A. 2.0 Hz
B. 0.2 Hz
C. 5 Hz
D. 2.5 Hz
Answer:
A
Explanation:
frequency is the product of time and wave length
Answer:
(B) 0.2Hz
Explanation:
took the test and it for sure was not 2.0Hz
In carrying out an analysis of a mixture, what do you expect to see when the TLC plate has been allowed to remain in the developing chamber too long, so that the solvent front has reached the top of the plate
Answer:
See explanation
Explanation:
In TLC, the plate is spotted at a point above the solvent front and the solvent moves up the plate by capillary action leading to the separation of the various components of the mixture spotted on the plate.
However, if the TLC plate is allowed to remain in the developing chamber for too long such that the solvent front reaches the top of the plate, the components of the mixture will recombine at the top of the plate and cancel out any separation which may have occurred on the plate.
what can a wave be described as
Answer:
wavy, a feel of water, smooth and costy
Explanation:
How would you classify cloudy water as an abiotic factor? Human Impact, Dynamic Forces, or Ocean Chemistry.
Answer:
Option B, Dynamic force
Explanation:
Cloudy water is an abiotic factor as it cannot support life and it is produced due to the impact of Dynamic Forces.
Cloudy water consists of air bubbles and is harmless.
Biotic things have life and posses characteristics of living beings such as eating, walking, reproducing etc.
HELP PLZ!!! 37. Which of the following most accurately describes what the pH scale measures?
the strength of a compound.
the strength of a base
th oncentration of acids and bases.
O
the concentration of an acid
why is tin tin and aluminum the better choice for canned milk
Answer:
Well, they are very durable unlike other packaging food materials, they can be recycled. But, the internet says allumninum cans are much better. and it could be better because you can keep the canned milk cool (cold) for a long lasting time. (keep it in the fridge if you want it to stay cold even longer)
Cual es la nomenclatura stock/tradicional/sistematica del oxigeno????
Answer:
english pls so i can answer