Answer:
kggyiuol
Explanation:
Explain why vigorous exercise causes the heart rate to increase and you to also breathe faster.
Answer:
When you are exercising, your muscles need extra oxygen—some three times as much as resting muscles. This need means that your heart starts pumping faster, which makes for a quicker pulse. Meanwhile, your lungs are also taking in more air, hence the harder breathing.
Explanation:
How many moles of PbCl2 are produced
if 14 moles of AlCl3 are consumed?
3Pb(NO3)2 + 2AlCl3 + 3PbCl2 + 2A1(NO3)3
Answer:21 moles of PbCl2 formed
Explanation: 3Pb(NO3)2(aq) + 2AlCl3(aq) --> 3PbCl2(s) + 2Al(NO3)3(aq)
14 moles AlCl3 x 3 moles PbCl2/2 moles AlCl3 =21 moles of PbCl2 formed
The number of moles of PbCl₂ produced when 14 moles of AlCl₃ are consumed in the reaction is 21 moles
Balanced equation3Pb(NO₃)₂ + 2AlCl₃ —> 3PbCl₂ + 2Al(NO₃)₃
From the balanced equation above,
2 moles of AlCl₃ reacted to produce 3 moles of PbCl₂.
How to determine the mole of PbCl₂ producedFrom the balanced equation above,
2 moles of AlCl₃ reacted to produce 3 moles of PbCl₂.
Therefore,
14 moles of AlCl₃ will react to produce = (14 × 3) / 2 = 21 moles of PbCl₂.
Thus, 21 moles of PbCl₂ were obtained from the reaction.
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2 H2 + O2 -> 2 H20
if 32 grams of oxygen reacts with sufficient hydrogen to make 36 grams of water, how many grams of hydrogen will be needed?
Answer:
8
Explanation:
since both hydrogen and water has the same numbers of mole. then as we know that mole = mass/molar mass, 2=mass/2 therefore mass= 4g
Help which one will it be
Answer:
D
Explanation:
Answer:
the answer is D I did that one in 5th grade
to which grop and period do the following elements belong carbon,neon,aluminium,potassium ,calcium,sulphur
Answer:
C:4A second period Ne:8A second period Al:3A third period K:1A fourth period Ca:2A fourth S:6A third period
Explanation:
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Therefore, with the help of periodic table we can locate the element's position.
What is periodic table?Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.
carbon belongs to period 2 and group 14
neon belongs to period 2 and group 18
aluminium belongs to period 3 and group 13
potassium belongs to period 4 and group 1
calcium belongs to period 4 and group 2
sulfur belongs to period 3 and group 16
Therefore, with the help of periodic table we can locate the element's position.
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Classify the following as a chemical or
physical property:
Aluminum is a shiny, silver color.
chemical
physical
Answer:
physical
Explanation:
the cl-cl bond will react more readily, because it has a
The Cl-Cl bond will react more readily because it has a lower bond energy than the C- H bond.
What is bond energy?The bond energy refers to the energy required to break the bonds that links two atoms together in a molecule. It is equal to the energy that is evolved when the bond is formed.
In comparing the Cl-Cl bond with the C-H bond, we will find out that the Cl-Cl bond will react more readily because it has a lower bond energy than the C- H bond.
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How do you calculate the volume of air displaced by a balloon? Is there a formula? also, how do you calculate the mass of air displaced by balloon?
What mass of oxygen is required to react completely with the burning of 25.0 g of hexane?
Answer:
88.2
Explanation:
Find the mass of a single one of the molecules or ionic compounds listed below. You must show your work in the correct format and include units in your answer to receive credit. Round your final answer to the nearest 0.1.
(YOU DONT HAVE TO CIRCLE WETHER ITS MM OR FM)
How do you obtain oxide from a mixture?
By direct heating of an element with oxygen : many metals and non-. metals burn rapidly when heated in oxygen or air producing their oxides e.g.
Predict the products
Answer:
1. No reaction.
2. ZnCl₂ + H₂
3. CaCl₂ + H₂
Explanation:
1. Cu + HCl —> ___
From the reactivity series of metals, H is higher that Cu in the series and so, Cu can not displace H from solution.
Therefore, no reaction will occur.
2. Zn + HCl —> ___
Zn is higher than H in the activity series so, it will displace H from acid solution to produce hydrogen gas, H₂.
The balanced equation is given below:
Zn + 2HCl —> ZnCl₂ + H₂
3. Ca + HCl —> ___
Ca is higher than H in the activity series so, it will displace H from acid solution to produce hydrogen gas, H₂.
The balanced equation is given below:
Ca + 2HCl —> CaCl₂ + H₂
ASAP
Which best describes water?
A- an element
B- a compound
C- a homogeneous mixture
Answer:its B
Explanation:
You welcome
How many moles are in 120.g of ar?
Answer:
3 moles of Argon
Explanation:
The molar mass for argon is 39.948 g/mol
[tex]\frac{120g}{39.948g/mol} = 3.004molesAr[/tex]
I’ll really appreciate it if you help me out on this one .
Answer:
i'd say D
Explanation:
the dependent variable is the change that happens
8. A sample of 16.0g of a metal oxide, MO, is reduced to 12.8g of the metal, M.
What is the relative atomic mass, Ar, of M?
A 32 B 64 C 80 D 128
Answer:
B 64
Explanation:
i think b 64 is right answer.......
The relative atomic mass is 64g and the metal is copper(Cu).
What is relative atomic mass?The weighted average of the masses of an element’s isotopes in comparison to the mass of a carbon-12 atom is known as relative atomic mass (Ar).The ratio of the average mass of atoms of a chemical element in a given sample to the atomic mass constant is defined as relative atomic mass (Ar) or atomic weight.The mole ratio for M and O in the compound MO is 1:1.
The mass of oxygen in the 16g compound is 16.0 - 12.8 = 3.2g.
The relative atomic mass of O is 16g. The number of moles of O in the 3.2g is 3.2/16 = 0.2.
Since the M and O gave the same number of moles in the MO, that is their mole ratio is 1:1, then the number of moles of the M in the MO is also 0.2.
Therefore, if 0.2 mole if M weighs 12.8g, then 1 mole of M will weigh 1 x 12.8/0.2 = 64g/mole.
The mole of an element is its relative atomic mass.
Therefore, the relative atomic mass of M is 64g.
Hence, option B is the correct answer.
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if a gas is pumped from a smaller container to a container that is twice size, what happens to the pressure of the gas?
what is the equivalent weight of sodium trioxocarbonate (IV) in the reaction between Hydrochloric acid and sodium trioxocarbonate (IV)?
Correct answer gets brainliest. This is urgent.
Answer:
Standard acid-base reaction in two stages:
Na2CO3 + HCl → NaHCO3 +NaCl
NaHCO3 + HCl → NaCl + CO2 + H2O
If only a small quantity of acid is added (and the overall solution remains above pH 7), the reaction would stop at stage 1 and you’d be left with an aqueous solution of sodium chloride and sodium bicarbonate. Adding more acid would lead to the bicarbonate being converted to carbon dioxide and water, with the CO2 coming out of solution as a gas and more sodium chloride being produced.
Score of 0.500 M solution of a weak acid,[H+] was measured as 4.02× 10 to the -3rdM, what is the dissociation constant?
Answer:
Explanation:
1.0
⋅
10
−
7
Explanation:
Start by writing a balanced chemical equation for the partial ionization of the acid
HA
(aq]
+
H
2
O
(l]
⇌
A
−
(aq]
+
H
3
O
+
(aq]
Notice that you have
1
:
1
mole ratios across the board. For every mole of acid that ionizes in aqueous solution, you get one mole of its conjugate base and one mole of hydronium ions,
H
3
O
+
.
In other words, the equation produces equal concentrations of conjugate base and hydronium ions.
Now, you can use the pH of the solution to calculate the equilibrium concentration of the hydronium ions.
pH
=
−
log
(
[
H
3
O
+
]
)
⇒
[
H
3
O
+
]
=
10
−
pH
In your case, the pH of the solution is equal to
4
, which means that you'll have
[
H
3
O
+
]
=
10
−
4
M
By definition, the acid dissociation constant,
K
a
, will be equal to
K
a
=
[
A
−
]
⋅
[
H
3
O
+
]
[
HA
]
The expression for the acid dissociation constant is written using equilibrium concentrations. So, if the reaction produced a concentration of hydronium ions equal to
10
−
4
M
, it follows that it also produced a concentration of conjugate base equal to
10
−
4
M
.
Because the initial concentration of the acid is considerably higher than the concentrations of the conjugate base and hydronium ions, you can approximate it to be constant.
This means that the acid dissociation constant for this acid will be
K
a
=
10
−
4
⋅
10
−
4
0.100
=
1.0
⋅
10
−
7
This is the underlying concept behind an ICE table
HA
(aq]
+
H
2
O
(l]
⇌
A
−
(aq]
+
H
3
O
+
(aq]
I
0.100
0
0
C
(
−
x
)
(
+
x
)
(
+
x
)
E
0.100
−
x
x
x
Here
x
represents the equilibrium concentration for the conjugate acid and hydronium ions. Since you know that
x
=
10
−
4
, you will have
K
a
=
10
−
4
⋅
10
−
4
0.100
−
10
−
4
Once again, you can use
0.100
−
10
−
4
=
0.0999
≈
0.100
to get
K
a
=
10
−
8
0.100
=
1.0
⋅
10
−
7
What are the 4 limiting factors
It’s in the image~
Answer:
I'm pretty sure you have it correct
1)Where are irons in our body ?
2) Is there some difference in the way metals and non– metals react with acid ?
Answer:
iron is found in the red blood cells of your blood called hemoglobin and in muscle cells called myoglobin. Hemoglobin is essential for transferring oxygen in your blood from the lungs to the tissues.
2( non- metals generally do not react with acids but metals react with acids and produce hydrogen gas that burns with a 'pop' sound. You must have noticed that copper does not react with dilute hydrochloric acid even on heating but it reacts with sulphuric
how many atoms are in 0.25 moles of nitrogen
Answer:
0.25 mole of NO2 contains 0.25 mole 'N'
one mole contains 6.023 x 10 ^23 atoms
0.25 mole II------------------------------>?
= 0.25 x 6.023 x10^23 = 1.5 x 10^23 atoms
Explanation:
gold has a density of 19.32 g/cm3 if you cut a piece of gold in half how much will the density of each piece be?
Answer:
19.32 g/cm³
Explanation:
The density will remain the same no matter how many times you cut the gold. The density is g/cm³ or g/mL. Density is essentially how many grams 1 mL of a compound weighs.
Answer:
[tex]\boxed {\boxed {\sf 19.32 \ g/cm^3}}[/tex]
Explanation:
Density is the mass per volume (g/mL or g/cm³). It is an intrinsic property. This means it is not dependent on the amount and all samples of the same substance have the same density.
Therefore, if a piece of gold has a density of 19.32 grams per cubic centimeter and it is cut in half, the two pieces will have the same density.
please answer as soon as possible if you can
Answer:
Second one
Explanation:
At what temperature would the volume of a gas be equal to 45.7 L, if the volume of that gas was 33.9 L at 12.4ºC? 241.9 K 241.9 K 451.2 K 451.2 K 384.7 K 384.7 K 273.15 K
Answer:
The temperature will be 384.7 K
Explanation:
Charles's Law consists of the relationship that exists between the volume and the temperature of a certain quantity of ideal gas, which is maintained at a constant pressure, by means of a constant of proportionality that is applied directly. For a given sum of gas at a constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases because the temperature is directly related to the energy of the movement of the gas molecules. .
In summary, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the quotient that exists between the volume and the temperature will always have the same value:
[tex]\frac{V}{T} =k[/tex]
Having an initial state 1 and a final state 2, the following is true:
[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]
In this case:
V1= 33.9 LT1= 12.4 C= 285.4 K (being 0 C= 273 K)V2= 45.7 LT2= ?Replacing:
[tex]\frac{33.9 L}{285.4 K} =\frac{45.7 L}{T2}[/tex]
Solving:
[tex]T2=45.7 L*\frac{285.4 K}{33.9 L}[/tex]
T2= 384.7 K
The temperature will be 384.7 K
*
The prevailing weather patterns of a region
Answer:
noun. the composite or generally prevailing weather conditions of a region, as temperature, air pressure, humidity, precipitation, sunshine, cloudiness, and winds, throughout the year, averaged over a series of years. a region or area characterized by a given climate: to move to a warm climate.
Explanation:
How many moles of O are there in 41.8 grams of O?
Answer:
[tex]\boxed {\boxed {\sf 2.61 \ mol \ O}}[/tex]
Explanation:
To convert from grams to moles, the molar mass is used. This number tells us the grams per mole of a substance. It can be found on the Periodic Table. Look for oxygen.
Oxygen (O): 15.999 g/molUse this number as a ratio.
[tex]\frac {15.999 \ g \ O }{ 1 \ mol \ O }[/tex]
Multiply by the given number of moles.
[tex]41.8 \ g \ O *\frac {15.999 \ g \ O }{ 1 \ mol \ O }[/tex]
Flip the fraction so the grams of oxygen cancel.
[tex]41.8 \ g \ O *\frac { 1 \ mol \ O }{ 15.999 \ g \ O}[/tex]
[tex]41.8 *\frac { 1 \ mol \ O }{ 15.999 }[/tex]
[tex]\frac { 41.8 \ mol \ O }{ 15.999 }= 2.61266329146 \ mol \ O[/tex]
The original measurement of grams has 3 significant figures (4, 1, and 8). Our answer must have the same. For the number we calculated, that is the hundredth place. The 2 in the thousandth place tells us to leave the 1.
[tex]2.61 \ mol \ O[/tex]
41.8 grams of O has 2.61 moles of oxygen.
Gopher tortoises live on dry land. They live in large holes that they dig in the soil. Which statement gives the best explanation of how this behavior aids in soil formation?
A. It hardens the soil, allowing less water to reach the rocks underground.
B. It causes weathering of the rocks, as the tortoise breaks the rocks into smaller pieces.
C. It causes weathering of the rocks, as the tortoise breaks the rocks into smaller pieces.
D. It loosens and mixes the soil, increasing air in the soil and the ability to drain water.
Answer:
It moves rocks above ground, where they are exposed to more water and wind.
Identify the mystery metal using the formula for density (Density = Mass/Volume). The object has
a mass of 95 g and a volume of 4.9 cm3.
O Silver 10.5 g/cm3
O Mercury 13.5 g/cm3
O Gold 19.3 g/cm3
O Copper 9.0 g/cm3
what are 5 functions of proteins