Answer:
Option B and A
Explanation:
First our lungs take purified oxygen from air then provide it to heartOur heart gives oxygen to hemoglobin which is present in our bloodIt carries oxygen to all cellsand comes back with cO_2James Joule showed that _______ was a form of energy.
Answer:
Heat
Explanation:
He proved that heat was a form of energy. That is why the Joule (1 N*m or 1 kg*m^2/s^2) is the SI unit of energy. We now know that heat energy is a form of kinetic energy associated with temperature changes due to the vibrational motion in matter.
Which equilibrium represents a buffer equilibrium?
A.
HI + H2O H3O+ + I-
B.
HCN + H2O H3O+ + CN-
C.
NaOH OH- + Na+
D.
HCl + H2O H3O+ + Cl-
E.
HClO4 + H2O H3O+ + ClO4-
The equilibrium represents a buffer equilibrium is HI(aq)+H2O(l)→ H3O+(aq)+I−(aq)
What is equilibrium?Equilibrium is a process that occur in chemical reaction in which there is balance and stability. The rate of forward reaction is equal to the rate of backward reaction.
Buffer solution refer to a solution that have conjugate base and weak acid.
In buffer equilibrium, the weak acid isequal to the conjugate base be
Therefore, The equilibrium represents a buffer equilibrium
is HI(aq)+H2O(l)→ H3O+(aq)+I−(aq)
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8. How does water vapor get into the troposphere in the first place?
Answer:
Water vapor enters the atmosphere through evaporation from water bodies (oceans, seas, lakes, rivers), ice/snow cover and soil, as well as through evapotranspiration from vegetation
Explanation:
The cycle, which occurs in the troposphere, begins as the sun evaporates large amounts of water from the earth's surface and the moisture is transported to other regions by the wind. As air rises, expands, and cools, water vapor condenses and clouds develop
Perform the following
mathematical operation, and
report the answer to the
correct number of significant
figures.
3.96 * 0.1159 = [?]
The answer to the problem 3.96 * 0.1159 is : 0.459 (3 significant figures)
Meaning of Significant figures and the rule of engagementSignificant figures can be defined as numbers in a group of numbers that place number in the right value or worth.
Significant figures defined the value of measurement of a particular number.
The rules of engagement in this case is the set of rules or laid down principles that direct how we interact with this significant figures and how they are used.
For this case the significant figures of the product will be the same as the figure with the least significant figure in the multiplication.
In conclusion, The answer to the problem 3.96 * 0.1159 is : 0.459 (3 significant figures)
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A piece of copper wire is 180 cm long. how long is the wire in millimeters? how many
40 mm segments of wire can be cut from the length
Centimeters and millimeters are both interconvertible units to measure length. The conversion factor is as follows:
1 centimetre = 10 millimetres
This means that if a copper wire is 180cm long, the wire would be;
180 × 10 = 1800mm long
Also, the number of 40 mm segments of wire that can be cut from the length is calculated as follows:
1800mm/40mm = 45
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In a simple distillation setup, what is the sequence of equipment from the bench top to the round bottom flask
In a simple distillation setup, the sequence of equipment from the bench top to the round bottom flask is:
ThermometerDistillation flaskLiebig condenserRound bottom flaskBunsen burnerWhat is Distillation?This is the process in which a mixture is separated through selective boiling and condensation.
The distillation flask and liebig condenser are usually located above the round bottom flask in the set up.
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A reaction proceeds with 2.72 moles of magnesium chlorate and 3.14 moles of sodium hydroxide. this is the equation of the reaction: mg(clo3)2 2naoh → mg(oh)2 2naclo3. determine the theoretical amount of each product that the reaction will produce. the reaction will produce of magnesium hydroxide and of sodium chlorate.
The theoretical amount of each product obtained are:
1.57 moles of Mg(OH)₂3.14 moles of NaClO₃Balanced equationMg(ClO₃)₂ + 2NaOH —> Mg(OH)₂ + 2NaClO₃
How to determine the limiting reactantFrom the balanced equation above,
1 mole of Mg(ClO₃)₂ reacted with 2 moles of NaOH
Therefore,
2.72 moles of Mg(ClO₃)₂ will react with = 2.72 × 2 = 5.44 moles of NaOH
From the calculation above, we can see that a higher amount (5.44 moles) of NaOH than what was given (3.14 moles) is needed to react completely with 2.72 moles of Mg(ClO₃)₂
Therefore, NaOH is the limiting reactant
How to determine the theoretical yield of Mg(OH)₂From the balanced equation above,
2 moles of NaOH reacted to produce 1 mole of Mg(OH)₂
Therefore,
3.14 moles of NaOH will react to produce = 3.14 / 2 = 1.57 moles of Mg(OH)₂
Thus, the theoretical yield of Mg(OH)₂ is 1.57 moles
How to determine the theoretical yield of NaClO₃From the balanced equation above,
2 moles of NaOH reacted to produce 2 mole of NaClO₃
Therefore,
3.14 moles of NaOH will also react to produce 3.14 moles of NaClO₃
Thus, the theoretical yield of NaClO₃ is 3.14 moles
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Based on the data table, answer the following questions: 1. based o
n the results in the test for starch (carbohydrates), which food samples tested positive?
2. based on the results in the test for reducing sugar (carbohydrates), which food sample tested negative?
Rice, pasta,sugar and chocolate tested positive for starch while water tested negative for reducing sugar.
What is Carbohydrate?
This is an organic compound which consists of carbon, hydrogen and oxygen.
It consists of sugars, starch etc in which the food mentioned above also contain them which is why they were chosen as the appropriate choice.
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Prove that: F = Gm₁m₂ /d^2
Answer:
hope it helps
and give brainliest
Which of the following numbers is equal to the value shown in scientific
notation below?
1.9 x 10-2
A.0.0019
B.0.019
C.0.19
D. 0.00019
Explanation:
the answer for the above
is b)0.019
Which element has the largest atomic radius?
Answer:
Ba
Explanation:
Atomic radius increases going right to left, and up to down.
So the closest element to the bottom left corner is Ba.
NEED HELP!!!
How many moles of magnesium is 3.01 x 1022 atoms of calcium?
preferably a step by step answer....thank u<3
Answer:
0.03 mol
Explanation:
The equation relating the number of moles and number of atoms is:
Number of atoms = number of moles × 6.02 × 10²³
[6.02 × 10²³ is the Avogadro's constant and is the number of particles in 1 mole of any substance.]
By rearranging the equation, we can find the number of moles of calcium.
Number of moles = (3.01 × 10²²) ÷ (6.02 × 10²³)
Number of moles = 0.05 moles of calcium
Now the only data we know about these two elements are their Mr values, so we are going to find the number of moles of magnesium using ratio.
Moles : Mr
0.05 mol : 40.1
x : 24.3
[we are going to assume that x is the number of moles of magnesium that we have to find out.]
Cross multiply the ratios.
40.1x = 0.05 × 24.3
x = 1.215 ÷ 40.1 = 0.03 mol
Kira dissolved different solutes in 100 ml of water. She recorded the amount of each solute that would dissolve at different temperatures. What information will this investigation confirm?.
Including soluble fiber into your diet can __________.
A. digest amino acids
B. digest cellulose
C. raise cholesterol levels
D. lower cholesterol levels
Answer:
The answer is D.
Explanation:
Including soluble fiber into your diet can lower cholesterol levels.
An element A combines with element B. The electrons are transferred from the atom A to the atom B. .
(a) What is the nature of bond between A and B?
(b) What are the two main properties expected compound AB?
(c) What happens if this compound is dissolved in water? To
(a) The nature of bond between A and B is an ionic bond.
(b) The two main properties of the ionic compounds are:
Ionic Compounds have high boiling and melting points as they're very strong and require a lot of energy to break.The electrostatic forces of attraction between oppositely charged ions lead to the formation of ions.(c) If the ionic compound is dissolved in water, the ions in the solid separate and disperse uniformly
What is an ionic compound?Ionic compounds contain ions and are held together by the attractive forces among the oppositely charged ions.
An ionic bond is formed by the complete transfer of some electrons from one atom to another. The atom losing one or more electrons becomes a cation—a positively charged ion.
In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution.
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Calculate the % composition of the unknown liquid using your most precise result. It is a mixture of ethanol (D[ETOH] = 0.7890 g/mL) and water. We will assume the temperature was 20.0 °C in the lab and the density of water was D[H2O] = 0.9982 g/mL.
% composition of ethanol = 34.51%
% composition of water = 65.49%
What is density?A material's density is defined as its mass per unit volume.
Given data:
The density of ethanol = 0.7890 g/mL
The density of water = 0.9982 g/mL
The density of mixture = 0.926 g/mL
Let the % composition of ethanol = x
Let the % composition of water = 100-x
Now density of the mixture
[tex]\frac{Mass}{Volume}[/tex]
[tex]Mass = \frac{percent \;of \;ethanol \;X \;density \;of \;ethanol \;+ \\ \;percent \;of \;water X \;density \;of \;water}{100}[/tex]
[tex]0.926 = \frac{x X 0.7890 g/mL \;+ (100-x) X 0.9982 g/mL}{100}[/tex]
[tex]x= 34.51[/tex] %
Hence,
% composition of ethanol = 34.51%
% composition of water = 65.49%
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Identify which substitution product is expected to be favored. Explain. The inverted product is expected to predominate slightly, due to SN2 competition. The product with retention of configuration is expected to predominate slightly, because the leaving group blocks the nucleophile.
The substitution product that is suppose to be favoured is The product with retention of configuration is expected to predominate slightly, because the leaving group blocks the nucleophile.
What is substitution product?Substitution product is a product that is gotten from a reaction in which a group of reactant is replaced by another group in the reaction.
Therefore,The substitution product that is suppose to be favoured is The product with retention of configuration is expected to predominate slightly, because the leaving group blocks the nucleophile.
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Consider the dissociation of srso4, which has a ksp of 3.2 x 10-7. what do the three rows of (i,c,e) stand for in the table? how can the table be used to find equilibrium constants for this example?
The concentration of the ions of the solution is 5.7 * 10^-4 M.
What is the ICE table?The ICE table can be used to determine the equilibrium constant of the process; SrSO4(s) ⇔ Sr^2+(aq) + SO4^2-(aq). ICE stands for initial, concentration and equilibrium.
Thus;
SrSO4(s) ⇔ Sr^2+(aq) + SO4^2-(aq)
I 0 0
C +x +x
E x x
Now;
Ksp = x^2
x = √Ksp
x = √3.2 x 10-7
x = 5.7 * 10^-4 M
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What must happen for carbon dioxide to sublimate at a given pressure ?
Answer:
If the pressure is reduced on the solid carbon dioxide the temperature will drop and the liquid carbon dioxide will solidify into snow-like substance.
Explanation:
Which energy source has been developed and improved by chemists?
A. coal
B. wind
C. battery
please don't say nuclear as it is quite literally not a choice.
List the five main components of a nuclear reactor facility and explain why each part is important . Use details to support your answer
The five components that are important are nuclear fuel consisting of fissionable material, reactor coolant, a nuclear moderator, control rods, and a shield/containment system.
What is a nuclear reactor?Nuclear reactors are the main parts of the nuclear power plant. They run the nuclear power by initiating the nuclear reactions which produce heat.
Thus, the five components that are important are nuclear fuel consisting of fissionable material, reactor coolant, a nuclear moderator, a shield/containment system, and control rods.
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How many moles of naoh will react with 13.5 moles of k3po4
Answer: 40.5 mol
Explanation:
Since this is a double replacement reaction, the unbalanced equation is something like follows:
[tex]\text{K}_{3}\text{PO}_{4}+\text{NaOH} \longrightarrow \text{KOH}+\text{Na}_{3}\text{PO}_{4}[/tex]
Balancing this equation,
[tex]\text{K}_{3}\text{PO}_{4}+3\text{NaOH} \longrightarrow 3\text{KOH}+\text{Na}_{3}\text{PO}_{4}[/tex]
From this equation, we can conclude that for every 3 moles of sodium hydroxide consumed, 1 mole of potassium phosphate is consumed.
This means the answer is 13.5(3)=40.5 mol
approximately how often does the moon revolve around the earth?
o every 365 days
every 30 days
daily
o every season
Answer: A
Explanation: NO CAP..................... A!!!!!!!!!!!!!!
How might this graph be different if the farmers had grown a wide variety of potato plants or had included other crops in their fields? Construct an explanation to support your answer. Construct an explanation to support your answer.
The graph would not have plummeted if various species were planted due to improvement of the potato crops.
What is variety?
The term variety has to do with the planting of different species of plants on the same farm. We know that the planting of different species of the same crop helps to improve the resistance to diseases of a plant.
Hence, the graph would not have plummeted if various species were planted due to improvement of the potato crops.
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what is reacitivty series, and how you can access reactivity of metals...
In Chemistry, a reactivity series of metals , also known as the activity series refers to the arrangement of metals in the descending order based upon their reactivity .
Salient Features :-
The metal at the top of the reactivity series are powerful reducing agents since they are easily oxidized.The reducing ability of metals grows weaker while traversing down the series.The electro-positivity of metals also reduces while moving down the reactivity series.Metals that are placed higher on the reactivity series have the ability to displace metals that are placed lower in the series.The metal reactivity series is given below :-
To access the reactivity of metal , from the given reactivity series identify any of the metal and locate the reactivity based upon the choice of reactivity. The metal at the top (Potassium) is most reactive and the metal at the bottom (Platinum) is the least reactive.
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Which lists only abiotic factors in this environment?
grass, tree, rock, soil
bird, turtle, grass, tree
sun, water, grass, soil
water, rock, soil, sun
In this case, among the list of components given, the abiotic factors are water, rock, soil, and sun.
What is an abiotic factor?An abiotic factor is a non-living part of an ecosystem that shapes its environment.
Biotic and abiotic factors make up a community via interaction.
Biotic factors are considered living things (having "life") while abiotic factors are simply non-living things.
Hence, in this case, among the list of components given, the abiotic factors are water, rock, soil, sun
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[tex] \begin{gathered}\\ \underline{\boxed{\large\leadsto\frak\red{ Answer :- }}} \\ \end{gathered}[/tex]
In this case, among the list of components given, the abiotic factors are water, rock, soil, and sun.What is an abiotic factor?
An abiotic factor is a non-living part of an ecosystem that shapes its environment.Biotic and abiotic factors make up a community via interaction. Biotic factors are considered living things (having "life") while abiotic factors are simply non-living things. Hence, in this case,♠ Among the list of components given, the abiotic factors are water, rock, soil, sun
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Select the correct answer from each drop-down menu. Amy put some salt in a weighing dish. Then she put the weighing dish on a sensitive balance to measure the mass of the salt. She removed the weighing dish from the balance and put it in several similar balances. She recorded the mass each time.
Mass 1 Mass 2 Mass 3 Mass 4 Mass 5 5.608 g 5.607 g 5.608 g 5.608 g 5.609 g
Amy forgot to subtract the mass of the empty weighing dish from her measurements, and she reported the mass of the salt as 5.608 grams. Amy's measurement of the salt's mass(1)______ accurate because(2)______ . Amy's measurement of the salt's mass(3)_____precise because(4) _______ .
1. A. is B. is not
2.
it is not close to the actual value
she used five different balances
the individual measurements are similar
3. is
is not
4. it is not close to the actual value
she used five different balances
the individual measurements are similar
Answer:
is wrong as she fogot to do something at the start and it is not a fair test
Explanation:
first she need to use the same with in plate second she needs to make the weighs not measure the dish third when the weighs are on 0 put your ingredient on
ps i have dislexia
20 examples of normal salt
Which information must be known about a compound to find the molecular formula from the empirical formula?
The molecular mass of the compound is required to calculate the molecular formula from the empirical formula.
What is a molecular formula?A chemical formula that gives the total number of atoms of each element in each molecule of a substance.
Dividing the molar mass of the compound by the empirical formula mass. The result should be a whole number or very close to a whole number. Multiplying all the subscripts in the empirical formula by the whole number will give the resultant molecular formula.
Hence, the molecular mass of the compound is required to calculate the molecular formula from the empirical formula.
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**asap!!** can someone write me a balanced equation with this sundae recipe
1. 12 banana hands
2. 2 bottles of chocolate syrup
3. 12 breyers vanilla ice cream
4. 2 containers of candy cherries each have 30 cherries.
5.1 bottle of whipped cream
Answer:
12 banana hands + 2 bottles of chocolate syrup + 12 scoops of Breyers ice cream + 2 containers of candy cherries(30 cherries/per) + bottle of whipped cream.
Explanation:
Hope this helps!