How many significant figures do the following numbers have?
7.
36,004
8.
10.040
9.
0.03460
10.
2.804
11.
4000
12.
13.04 x 104
Answers
Answer:
7. 5
8. 4 or 5
9. 3 or 4
10. 4
11. 1 or 2 or 3 or 4
12. 6
Explanation:
7. 5
8. 4 (excluding the 0) or 5 (including the 0)
9. 3 (excluding the 0 at the back) or 4 (including the 0 at the back)
10. 4
11. 1 or 2 or 3 or 4 (according to the number or 0s included)
12. 13.04 × 104 = 1356.16
ans: 6
Related Questions
Pick the odd one out from the following.
Milk, Butter, Smoke , Carbon dioxide
1.Milk
2.Carbon dioxide
3. Smoke
4.Butter
plz answered fast
Answers
Answer:
Smoke
Explanation:
All of those listed are under the group of matter, except for smoke, making it the odd one one.
The rough definition of matter means that it occupies space, but smoke does not.
There are 3 main groups, Solid, Liquid and Gas.
Milk is classified under liquid.
Carbon Dioxide is classified under gas.
Butter is classified under solid.
Since you cannot classify smoke under any of the 3 categories, it is the odd one out.
What organelles can only be seen in detail using an electron
microscope?
Answers
There are several organelles that can only be seen in detail using an electron microscope, including:
Ribosomes: These organelles are responsible for synthesizing proteins and are made up of ribonucleic acid (RNA) and proteins. They are too small to be seen with a light microscope and can only be seen in detail using an electron microscope.
Endoplasmic reticulum (ER): The ER is a series of interconnected flattened sacs or tubes that are involved in the synthesis and transport of proteins and lipids. It has two main types: the smooth ER, which is involved in the synthesis and modification of lipids, and the rough ER, which is studded with ribosomes and is involved in the synthesis and transport of proteins.
Golgi apparatus: The Golgi apparatus is a series of flattened stacks of membranes that are involved in the modification, sorting, and transport of proteins and lipids. It is made up of cisternae, which are flattened stacks of membranes that are connected by vesicles.
Mitochondria: These organelles are responsible for generating energy in the form of ATP and are involved in a variety of other metabolic processes. They have a complex structure that includes a double membrane, cristae, and a matrix, which can only be seen in detail using an electron microscope.
Lysosomes: These organelles are involved in the digestion and breakdown of cellular waste and are made up of enzymes that can break down a variety of biomolecules. They have a characteristic spherical shape that can only be seen in detail using an electron microscope.
What structures and materials are found in all cells?
Answers
Answer: the plasma membrane, the cytoplasm, ribosomes, and genetic material.
hope this helped
what is matter made of?
Answers
Consider the acid-base nature of barium cyanide, Ba(CN)2, when it is dissolved in water.
(1) What are the acid-base properties of the cation? _________acidicbasicneutral
(2) What are the acid-base properties of the anion? _________acidicbasicneutral
(3) Would an aqueous solution of barium cyanide be acidic, basic or neutral? _________acidicbasicneutral
Answers
1. The correct answer is basic. Barium cyanide, Ba(CN)2, is an ionic compound composed of a barium cation and a cyanide anion.
When it is dissolved in water, it will dissociate into barium cations and cyanide anions. The barium cation has a +2 charge, so it will accept two hydrogen ions from the water, forming the barium hydroxide ion, Ba(OH)2, making the barium cation basic in nature.
2. The correct answer is acidic. Barium cyanide, Ba(CN)2, is an ionic compound composed of a barium cation and a cyanide anion.
When it is dissolved in water, it will dissociate into barium cations and cyanide anions. The cyanide anion has a -1 charge, and will donate a single hydrogen ion to the water, forming the hydronium ion, H3O+, making the cyanide anion acidic in nature.
3. The correct answer is neutral. An aqueous solution of barium cyanide, Ba(CN)2, will be neutral. When the compound is dissolved in water, it will dissociate into barium cations and cyanide anions.
The barium cation will accept two hydrogen ions from the water, forming the barium hydroxide ion, Ba(OH)2, and the cyanide anion will donate one hydrogen ion to the water, forming the hydronium ion, H3O+. These two processes will cancel each other out, resulting in a neutral solution.
Learn more about acid-base:
https://brainly.com/question/15334816
#SPJ4
Dissolving continues until an equilibrium is established.
O True
O False
Answers
Explanation:
What is height? Give an example.
Answers
IT WILL STALK YOU IN THE WOODS AT NIGHT...
Write a balanced overall reaction from these unbalanced half-reactions.
{eq}Cu \to Cu^{2+} {/eq}
{eq}Ag^+ \to Ag {/eq}
Answers
\(2Cu + 2Ag^+ \rightarrow 2Cu^{2+} + 2Ag\) is a balanced overall reaction from these unbalanced half-reactions.
A chemical equation that is balanced has the same amount of atoms of each element on both sides of the equation. A chemical reaction must be balanced in order for mass to be preserved, which means that all of the atoms present in the reactants must also be present in the products. One must change the equation's coefficients in order to balance a response. The moles of each compound involved in the reaction are represented by the coefficients.
\(Cu \rightarrow Cu^{2+}\)
\(Ag^+ \rightarrow Ag\)
Balancing the half equation
\(2Cu \rightarrow 2Cu^{2+}\)
\(2Ag^+ \rightarrow 2Ag\)
balanced overall reaction:
\(2Cu + 2Ag^+ \rightarrow 2Cu^{2+} + 2Ag\)
To know ore about balanced reaction, here:
https://brainly.com/question/28215760
#SPJ4
Complete and balance the equations for the following acid-base reactions
Answers
The equations for the following acid-base reactions are
a. H₂CO₃ + Sr(OH)₂ → SrCO₃ + 2H₂O
b. HClO₄ + NaOH → NaClO₄ + H₂O
c. HBr + Ba(OH)₂ → BaBr₂ + 2H₂O
d. NaHCO₃ + H₂SO₄ → Na₂SO₄ + 2H₂O + CO₂
An acid–base reaction is a type of chemical reaction that involves the exchange of one or more hydrogen ions, H⁺, between species that may be neutral (molecules, such as water, H₂O) or electrically charged (ions, such as ammonium, NH₄⁺; hydroxide, OH⁻; or carbonate, CO₃²⁻).
Your question is incomplete but most probably your question was
Complete and balance the equations for the following acid-base reactions:
a. H2CO3 + Sr(OH)2 → ...
b. HClO4 + NaOH → ...
c. HBr + Ba(OH)2 → ...
d. NaHCO3 + H2SO4 → ...
Learn more about acid-base reactions: https://brainly.com/question/10224396
#SPJ11
in a lithium ion batteries, the lithium ions themselves constitute the:
Answers
The battery also includes a separator, which helps keep the anode and cathode apart, as well as current collectors, which conduct the flow of electrons inside the battery.
In a lithium-ion battery, the lithium ions themselves constitute the electrolyte. Lithium-ion batteries use a lithium ion to transport electrons between the anode and cathode electrodes when they charge and discharge. Lithium-ion batteries, unlike conventional batteries, do not have a liquid electrolyte, but instead, they use a porous electrolyte that can transport lithium ions from one electrode to the other while still preventing the electrodes from touching. The anode and cathode of the battery are separated by a separator. The lithium ions themselves constitute the electrolyte in lithium-ion batteries.In general, a lithium-ion battery comprises a cathode, anode, and electrolyte. The anode is made of carbon, and the cathode is made of lithium cobalt oxide or a similar lithium-based compound. The battery also includes a separator, which helps keep the anode and cathode apart, as well as current collectors, which conduct the flow of electrons inside the battery.
To know more about collectors visit:
https://brainly.com/question/23095705
#SPJ11
P32 is a radioactive isotope with a half-life of 14.3 days. If you currently have 17.5 g of P32 , how much P32 was present 9.00 days ago
Answers
Answer:
27.07 gm nine days ago
Explanation:
17.5 = x (1/2)^9/14.3
x = 27.07 gm
The volume of a metal cylinder was measured indirectly by water displacement three times the following volume readings were recorded calculate the average volume of the metal cylinder
Answers
The average volume of the cylinder is 12.0 cm^3.
What is the volume?The volume is the space that is occupied by an object. We know that volume could be measured by the displacement method. In this method, the cylinder is immersed into water. Before the cylinder is immersed into water, the volume of the water is measured and recorded as shown. After the cylinder is immersed into water, the volume of the water is measured and recorded. The volume of the cylinder is the difference between the volume of the water after and before the immersion of the cylinder as shown.
We know that the average value always gives us an idea of that the accurate value is supposed to be hence we would take the average of all the three measurements in order to obtain the required result as shown in the image attached to this answer.
Volume from first measurement = 11.7 cm^3
Volume from second measurement = 12.1 cm^3
Volume from third measurement = 12.2 cm^3
Average volume = 11.7 cm^3 + 12.1 cm^3 + 12.2 cm^3
/3
= 12.0 cm^3
Learn more about volume:https://brainly.com/question/13338592
#SPJ1
you have an aqueous solution for which [h3o+] = 2.5 x 10-4 m. what is the ph of this solution?
Answers
The pH of an aqueous solution with a [H3O+] concentration of 2.5 x 10^-4 M can be calculated using the formula pH = -log[H3O+]. In this case, the pH of the solution is 3.60.
The pH of a solution is a measure of its acidity or basicity and is determined by the concentration of hydrogen ions ([H+]) or hydronium ions ([H3O+]) present in the solution. The relationship between pH and [H3O+] is given by the equation pH = -log[H3O+].
In this case, the concentration of [H3O+] is given as 2.5 x 10^-4 M. Plugging this value into the pH equation, we have pH = -log(2.5 x 10^-4) = 3.60.
Therefore, the pH of the given aqueous solution is 3.60.
Learn more about aqueous solution here: brainly.com/question/1382478
#SPJ11
The pH of the given aqueous solution is approximately 3.60.
What is PH?
The pH stands for potential of hydrogen and is a measure of the acidity or alkalinity of a solution. It is a logarithmic scale used to express the concentration of hydrogen ions ([H+]) in a solution. The lower the pH value, the more acidic the solution, and the higher the pH value, the more alkaline or basic the solution.
The pH of a solution is defined of hydronium ions ([\(H_3O+\)]) concentration in the solution.
Given [\(H_3O+\)] = 2.5 x \(10^{-4}\) M, we can determine the pH using the formula:
pH = -log10([\(H_3O+\)])
pH = -log10(2.5 x \(10^{-4}\))
Therefore:
pH = -log10(2.5) - (-4)
= -log10(2.5) + 4
pH ≈ 3.60
Therefore, the pH of the given aqueous solution for which [\(H_3O+\)] = 2.5 x \(10^{-4}\) M is approximately 3.60.
To learn more about the PH from the given link
brainly.com/question/12609985
#SPJ4
If you start with 3 moles of sodium and 3 moles of chlorine to produce sodium chloride, what is the limiting reagent?(you will need to balance the equation first.) na cl2 -> nacl
Answers
Sodium(Na) is the limiting reagent.
What is Limiting reagent?The reactant that is totally consumed during a reaction, or the limiting reagent, decides when the process comes to an end. The precise quantity of reactant required to react with another element may be estimated from the reaction stoichiometry.
How do you identify a limiting reagent?
The limiting reactant is the one that is consumed first and sets a limit on the quantity of product(s) that can be produced. Calculate how many moles of each reactant are present and contrast this ratio with the mole ratio of the reactants in the balanced chemical equation to get the limiting reactant.
Start by writing the balanced chemical equation that describes this reaction
\(2Na_{(s)} + Cl_{2 (g)} -- > 2NaCl_{(s)}\)
Notice that the reaction consumes 2 moles of sodium metal for every 1 mole of chlorine gas that takes part in the reaction and produces 2 moles of sodium chloride.
now we can see that we have 3 moles of sodium and 3 moles of chlorine, according to question. so, we can say that sodium is the limiting reagent in the given situation.
to learn more about Limiting Reagent go to - https://brainly.com/question/14222359
#SPJ4
how many grams of naf form when 0.500 mol of hf reacts with excess na2sio3
Answers
7.00 grams of NaF will be formed when 0.500 mol of HF reacts with excess Na2SiO3.
When 0.500 mol of HF reacts with excess Na2SiO3, the amount of NaF formed can be calculated using stoichiometry.
The molar ratio between HF and NaF can be determined from the balanced chemical equation, and then the number of moles of NaF can be converted to grams using its molar mass.
The balanced chemical equation for the reaction between HF and Na2SiO3 is:
6HF + Na2SiO3 → 3H2SiF6 + 2NaF
From the equation, it can be observed that 6 moles of HF react to form 2 moles of NaF. This can be expressed as a molar ratio: 6 mol HF : 2 mol NaF.
Given that 0.500 mol of HF is present, we can use the molar ratio to calculate the moles of NaF formed:
0.500 mol HF * (2 mol NaF / 6 mol HF) = 0.167 mol NaF
To convert the moles of NaF to grams, we need to multiply by its molar mass. The molar mass of NaF is 41.99 g/mol:
0.167 mol NaF * 41.99 g/mol = 7.00 g NaF
To learn more about molar click here:
brainly.com/question/31545539
#SPJ11
URGENT WHOEVER ANSWER CORRECT GETS BRAINLIEST ANSWER!!!!!! use the information in the table to calculate the ages of the meteorites. The half-life of potassium-40 is 1.3 billion years. Meteorite Initial Amount (g) Final Amount (g) 1 30 7.5 2 80 5 3 100 12.5 Use your calculations to answer the questions. How old is meteorite 1? How old is meteorite 2? How old is meteorite 3?
Answers
Answer:
1: 2.6billion
2: 5.2billion
3: 3.9billion
Explanation:
Edge 2021
Answer:
1 2.6billion
2 5.2billion
3 3.9billion
Some ethers can be prepared by heating the appropriate alcohol in the presence of sulfuric acid. can di- sec-butyl ether be prepared from sec-butanol by this route?
Answers
Yes, di-sec-butyl ether can be prepared from sec-butanol through the process of heating the alcohol in the presence of sulfuric acid. This method is known as the acid-catalyzed dehydration of alcohols.
In the case of sec-butanol, which has the structural formula \(CH_3CH(O_H)CH_2CH_3\), heating it in the presence of sulfuric acid promotes the removal of a water molecule (\(H_2O\)) from the alcohol. The acid acts as a catalyst, facilitating the reaction by protonating the alcohol and creating a good leaving group (water). The resulting intermediate compound is an alkene, specifically sec-butene (\(CH_3CH=CHCH_3\)).
This alkene can then undergo a second reaction, known as etherification, in which it reacts with another molecule of sec-butanol. The acid catalyst again promotes the reaction by protonating the alcohol and facilitating the elimination of another water molecule. This yields di-sec-butyl ether (\(CH_3CH(CH_3)CH_2OCH_2CH(CH_3)CH_3\)).
In conclusion, di-sec-butyl ether can indeed be prepared from sec-butanol through the acid-catalyzed dehydration and etherification reactions.
Learn more about di-sec-butyl ether
https://brainly.com/question/31974369
#SPJ11
In which direction does the electric field point at a position directly east of positive charge.
Answers
Answer:
The direction of the field is taken to be the direction of the force it would exert on a positive test charge. The electric field is radially outward from a positive charge and radially in toward a negative point charge.
Explanation:
Question 3(Multiple Choice Worth 1 points)
(01.01 LC)
Which of the following is usually done last in the scientific method of investigation?
1. Ask a question
2. Test with an experiment
3. Analyze data and draw conclusions
3. Do background research and 4.construct a hypothesis
Answers
Answer:
33333333333333333333333
Can a single absorption band distinguish between water vapor
and Carbon Dioxide in the gas phase?
Answers
A single absorption band is not sufficient to distinguish between water vapor and carbon dioxide in the gas phase.
In the gas phase, both water vapor (H2O) and carbon dioxide (CO2) exhibit multiple absorption bands in the infrared region of the electromagnetic spectrum. Each molecule has its unique set of vibrational and rotational modes, which result in specific absorption frequencies. While there may be some overlap in the absorption bands of water vapor and carbon dioxide, their distinct molecular structures and vibrational characteristics lead to different absorption patterns.
To accurately differentiate between water vapor and carbon dioxide, multiple absorption bands need to be examined. Spectroscopic techniques such as infrared spectroscopy or laser absorption spectroscopy can be employed, where the absorption spectra of the gases are compared with known reference spectra or analyzed using computational methods. By examining the absorption peaks and their corresponding wavelengths, it becomes possible to identify the presence of water vapor or carbon dioxide and determine their respective concentrations.
To learn more about gas phase click here: brainly.com/question/31872132
#SPJ11
What is SI unit of volume
Answers
Answer:
The SI unit of volume is m³
what reaction (oxidation or reduction) occurs at the cathode of a voltaic cell?
Answers
In a voltaic cell, the reaction that occurs at the cathode is the reduction reaction.
A voltaic cell consists of two half-cells, each containing an electrode (cathode or anode) and an electrolyte. In the cell, electrons flow from the anode to the cathode through an external circuit, generating electricity. At the cathode, reduction takes place as the positively charged ions in the electrolyte gain electrons, leading to a decrease in their oxidation state.
A voltaic cell, often called a galvanic cell, is an electrochemical device that produces electricity through uninhibited redox processes, both oxidation and reduction. It is divided into two distinct half-cells. A half-cell is made up of an electrode (a metal strip, M) dissolved in a solution containing Mn+ ions. M can be any metal. A wire from one electrode to the other connects the two half-cells cathode and anode. The half-cells are also connected by a salt bridge.
To learn more about voltaic cell, visit:
https://brainly.com/question/26228780
#SPJ11
find the coordinates of the following points
Answers
(
a
,
b
)
is a are the coordinates of a point in Cartesian Plane,
u
is its magnitude and
α
is its angle then
(
a
,
b
)
in Polar Form is written as
(
u
,
α
)
.
Magnitude of a cartesian coordinates
(
a
,
b
)
is given by
√
a
2
+
b
2
and its angle is given by
tan
−
1
(
b
a
)
Let
r
be the magnitude of
(
−
2
,
5
)
and
θ
be its angle.
Magnitude of
(
−
2
,
5
)
=
√
(
−
2
)
2
+
5
2
=
√
4
+
25
=
√
29
=
r
Angle of
(
−
2
,
5
)
=
tan
−
1
(
5
−
2
)
=
tan
−
1
(
−
5
2
)
=
−
68.198
degree
⇒
Angle of
(
−
2
,
5
)
=
−
68.198
degree
But since the point is in second quadrant so we have to add
180
degree which will give us the angle.
⇒
Angle of
(
−
2
,
5
)
=
−
68.198
+
180
=
111.802
⇒
Angle of
(
−
2
,
5
)
=
111.802
=
θ
⇒
(
−
2
,
5
)
=
(
r
,
θ
)
=
(
√
29
,
111.802
)
⇒
(
−
2
,
5
)
=
(
√
29
,
111.802
)
Note that the angle is given in degree measure.
What is one way someone could benefit from the non-separation of a colloid mixture? Explain.
Answers
An example are the emulsions used in the food industry.
How someone could benefit from the non-separation of a colloid mixture?One way someone could benefit from the non-separation of a colloid mixture is in the case of emulsions, which are a type of colloid mixture. Emulsions are mixtures of immiscible liquids, such as oil and water, stabilized by an emulsifying agent.
The non-separation of emulsions can be beneficial in various practical applications, such as the food Industry, where emulsions are commonly used in the food industry to create a wide range of products, including salad dressings, mayonnaise, sauces, and margarine. Emulsions provide desirable texture, appearance, and taste properties to these food products, and their non-separation allows for long shelf life and consistent quality.
Learn moer about emulsions at:
https://brainly.com/question/6711819
#SPJ1
find the name for this W(C2H3O2)4
Answers
The name for this W(C2H3O2)4 is the chemical formula for lead(IV) acetate, often known as lead tetraacetate, is Pb(C2H3O2)4.
What is chemical formula?Chemical formula is defined as any of a number of ways to describe the structure or content of chemical substances. The chemical formula is a way of expressing information about the atomic proportions that make up a certain chemical compound or molecule using the numbers and symbols of the chemical elements. The sorts of atoms and their numbers in a molecule or compound are described using chemical formulae. Each element's atoms are denoted by one or two distinct letters.
It is not a salt because it is a colorless solid that dissolves in nonpolar, organic liquids. Moisture causes it to break down, therefore acetic acid is usually added when storing it. The substance is utilized to create organic compounds.
Thus, the name for this W(C2H3O2)4 is the chemical formula for lead(IV) acetate, often known as lead tetraacetate, is Pb(C2H3O2)4.
To learn more about chemical formula, refer to the link below:
https://brainly.com/question/11995171
#SPJ2
what is the radius of a circle i
s
Answers
secondary alcohol (X) reacts with PCL5 to give alkyl halide (Y) which on dehydrohalogenation yield an alkene(Z).The alkene upon ozonolysis gives the mixture of ethanal and methanal.Identify X ,Y ,Z
Answers
Answer:
X = 2-propanol
Y = 2-chloropropane
Z = propene
Explanation:
Secondary alcohol is an alcohol in which the carbon that the functional group (OH group) is attached to is also attached to two alkyl group. Examples are 2-propanol and 2-butanol.
The secondary alcohol referred to in the question here is 2-propanol and it reacts with PCl₅ as seen below
H₃C-CH-CH₃ + PCl₅ ⇒ H₃C-CH-CH₃ + HCl + POCl₃
| |
OH Cl
The alkylhalide produced there is 2-chloropropane. Thus, we can see that X is 2-propanol and Y is 2-chloropropane.
When this 2-chloropropane undergoes dehydrohalogenation (removal of hydrogen and halogen) an alkene is formed. The reaction is seen below
H₃C-CH-CH₃ (-HCl) ⇒ H₃C-CH=CH₂
|
Cl
The alkene produced (as seen above) is propene.
Confirmation: When propene undergoes ozonolysis, the compounds produced are ethanal and methanal as seen in the equation below
O
/ \
H₃C-CH=CH₂ + O₃ ⇒ H₃C - CH CH₂ [-O] ⇒ CH + CH₂
|| || || ||
O O O O
The final products as seen above are methanal and ethanal
How many valence electrons does carbon have available for bonding to other atoms?
a. 2
b. 4
c. 6
d. 8
Answers
Answer:
4 valence electrons.
Explanation:
Carbon has 4 valence electrons because it is in the 14th group on the Periodic Table.
Which waves have the highest frequencies?
A. microwaves
B.UV
C. waves with the lowest energy
D. waves with the highest energy
Answers
Answer:
D. Waves with the highest energy
Explanation:
The more energy the higher the frequency. More specifically there will be more energy per photon.
Microwaves are on the low end of the electromagnetic spectrum while UV is higher but there are more waves with more energy such as gamma rays.
what happens when there is more kinetic energy?
Answers
Energy that a moving object has due to its motion is Kinetic Energy. Kinetic Energy: ... The faster an object moves, the more kinetic energy it has. The more mass an object has, the more kinetic energy it has.
Answer:
when there is more kinetic energy the objects moves fast...