Answer:
5 milliliters
Explanation:
Use the formula M1V1 = M2V2 where M is molarity and V is volume
Plug in numbers
(.25 M)(100 mL) = (5 M)V2
V2 = 5 mL
The volume of stock solution of 5M H₂SO₄ needed to prepare 100mL of 0.25M H₂SO₄ is 5mL.
How do we calculate the volume?Volume of stock solution to prepare any dilute solution will be calculated by using the following formula:
M₁V₁ = M₂V₂, where
M₁ & V₁ is the molarity and volume of stock solution, and
M₂ & V₂ is the molarity and volume of final prepared solution.
On putting values from the question to the above formula and calculate for the value of V₁ as:
V₁ = (0.25)(100) / (5)
V₁ = 5 mL
Hence required volume is 5mL.
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What happens when Ba (barium) and O (oxygen) combine?
Answer:
Barium reacts with oxygen when exposed to air, forming a thin passivating layer of BaO on the surface. When ingnited, barium reacts with both oxygen and nitrogen, forming a mixture of BaO, Ba 3N 2 and BaO 2.
Explanation:
Answer:
So, one ion of barium neutralizes one ion of oxygen, and so those two combine to form barium oxide, BaO .
How many liters of water do we need to add to 5.00 moles to get a 0.648 M solution?
Answer: This is a typical acid/base equilibrium problem, that involves the use of logarithms.
Explanation:We assume that both nitric acid and hydrochloric acid dissociate to give stoichiometric
H
3
O
+
.
Moles of nitric acid:
26.0
×
10
−
3
⋅
L
×
8.00
⋅
m
o
l
⋅
L
−
1
=
0.208
⋅
m
o
l
H
N
O
3
(
a
q
)
.
And, moles of hydrochloric acid:
88.0
×
10
−
3
⋅
L
×
5.00
⋅
m
o
l
⋅
L
−
1
=
0.440
⋅
m
o
l
H
C
l
(
a
q
)
.
This molar quantity is diluted to
1.00
L
. Concentration in moles/Litre =
(
0.208
+
0.440
)
⋅
m
o
l
1
L
=
0.648
⋅
m
o
l
⋅
L
−
1
.
Now we know that water undergoes autoprotolysis:
H
2
O
(
l
)
⇌
H
+
+
O
H
−
. This is another equilibrium reaction, and the ion product
[
H
+
]
[
O
H
−
]
=
K
w
. This constant,
K
w
=
10
−
14
at
298
K
.
So
[
H
+
]
=
0.648
⋅
m
o
l
⋅
L
−
1
;
[
O
H
−
]
=
K
w
[
H
+
]
=
10
−
14
0.648
=
?
?
p
H
=
−
log
10
[
H
+
]
=
−
log
10
(
0.648
)
=
?
?
Alternatively, we know further that
p
H
+
p
O
H
=
14
. Once you have
p
H
,
p
O
H
is easy to find. Take the antilogarithm of this to get
[
O
H
−
]
.
Answer link
Please help me with this net ionic chem equation
Answer:
C) H+(aq) + OH-(aq) ---》 H2O(aq)
Which example describes biotic factors interacting with the environment?
sunlight shining through a window
O oxygen circulating in the atmosphere
O rain forming puddles on the sidewalk
O butterflies resting on the flower of a plant
Answer:
O butterflies resting on the flower of a plant
Answer:
The answer is butterflies resting on the flower of a plant.
Explanation:
For the reaction
2 Al + 6 HCl → Al2Cl6 + 3 H2
how much hydrogen can be formed when 60 g
of aluminum reacts with excess hydrochloric
acid?
Answer in units of g.
Answer:
6.67 grams of hydrogen can be formed when 60 g of aluminum reacts with excess hydrochloric acid.
Explanation:
The balanced reaction is:
2 Al + 6 HCl → Al₂Cl₆ + 3 H₂
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Al: 2 moles HCl: 6 moles Al₂Cl₆: 1 mole H₂: 3 molesBeing the molar mass:
Al: 27 g/mole HCl: 36.45 g/mole Al₂Cl₆: 266.7 g/moleH₂: 2 g/moleBy reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Al: 2 moles* 27 g/mole= 54 grams HCl: 6 moles* 36.45 g/mole= 218.7 gramsAl₂Cl₆: 1 mole* 266.7 g/mole= 266.7 gramsH₂: 3* 2 g/mole= 6 gramsYou can apply the following rule of three: if 54 grams of aluminum forms 6 grams of hydrogen, 60 grams of aluminum will form how much mass of hydrogen?
[tex]mass of hydrogen=\frac{60 grams of aluminum*6 grams of hydrogen}{54 grams of aluminum}[/tex]
mass of hydrogen= 6.67 grams
6.67 grams of hydrogen can be formed when 60 g of aluminum reacts with excess hydrochloric acid.
What pressure, in atm, would be equal to 798 mmHg?
Answer:
1.05 atm
It should be 1 atm = 760 mm; therefore, 798 mm x (1 atm/760) = about 1.05 atm.
The value of pressure in atm that would be equal to 798 mmHg is 1.05 atmospheric.
What is pressure?Pressure is a physical quantity or a kind of force which is perpendicularly applied on the surface area of any object so that force is equally distributed on that surface.
Pressure will be maesured by various unit and have relation with one another.
As we know that, 1 atm = 760 mmHg
Or 1 mmHg = 1/760atm
Given quantity of pressure is 798 mmHg and we calculate this quantity by multiply this value by 1/760 and we get,
798 mmHg = 798mmHg × 1/760atm/mmHg = 1.05 atm
Hence required value of pressure is 1.05 atm.
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A comb is rubbed with a piece of wool fabric and placed next to some scraps of paper.
The paper moves toward the comb. The movement of the paper is caused by —
static electricity
magnetic attraction
mechanical energy
chemical energy
Answer: static electricity
Explanation: rubbing the comb creates. Static charge to comb
La predicción de las propiedades de un elemento en función de la posición que ocupa en el sistema periódico es una
Answer:
Los elementos de la tabla periódica se distribuyen sobre la base de similitudes.
Explicación:
Los diferentes tipos de elementos se distribuyen en 8 grupos de tabla periódica en función de sus propiedades. Los elementos que tienen propiedades similares se colocan en el mismo grupo. Por ejemplo, el primer grupo de la tabla periódica son los metales alcalinos. Todos los metales alcalinos tienen algunas propiedades similares, es decir, un electrón en su capa más externa, alta reactividad y forma metálica, mientras que, por otro lado, los ocho elementos del grupo son gases nobles que tienen una capa más externa completa y no tienen reactividad.
What volume will 1000 grams of nitrogen dioxide occupy at 380 mmHg at 0°C
0.69(78)Explanation:
Can someone please help a girl out and answer this plsss ...need this as soon as posible
Answer:
the anwser would be B obtain energy
Explanation:
Which statement BEST describes what happens when a cold front approaches a warm front?
The cold air mass will push the warm air mass upwards.
The cold air mass will slide over top of the warm air mass.
The cold air mass will retreat from the warm air mass.
Cold fronts have no affect on warm fronts when they come together.
Answer:
A
Explanation:
In a cold front set-up, the boundary between the cold and warm air masses is relatively steep, typically causing the warm air in front of it to rise rapidly.
A cold front has been the transition zone that includes the replacement into the warmer zones. The cold air mass will be settled at the bottom and pushes the warm air to rise. Thus, option A is correct.
What is the cold and warm front?A cold front is said to be the bad weather conditions that are has been constituted by the cooler air mass. It is cold and dry air that moves from the "northwest to the southeast" direction. In an occluded front, the cold front meets the warm front.
When the cold air front meets the warm air front then, the cold air being denser settles at the bottom and results in pushing the warm air front in an upwards direction. The warm front has less dense air that rises in an upward direction.
Therefore, option A. the cold front moves the warm front in the upper direction.
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How to find the number of protons in an element?
Answer:
Locate the element’s atomic number. The atomic number is located above the element symbol, in the upper left-hand corner of the square. The atomic number will tell you how many protons make up a single atom of an element.
Explanation:
Answer:
To calculate the numbers of subatomic particles in an atom, use its atomic number and mass number: number of protons = atomic number. number of electrons = atomic number. number of neutrons = mass number - atomic number.
Explanation:
i hope it helps and have a great day
Please answer the following questions....Very urgent!
How many atoms are in 9.95 moles of iron?
How many molecules are in 0.03 moles of Carbon dioxide?
How many moles are found in 7.20 x 10^23 atoms of platinum?
Answer:
59.92 × 10²³ atoms are in 9.95 moles of iron
1.8 ×10²² molecules are in 0.03 moles of Carbon dioxide
1.19 moles are found in 7.20 x 10^23 atoms of platinum
HELP ME PLS HELP ME PLS HELP ME PLS HELP ME PLS HELP ME PLS HELP ME PLS HELP ME PLS HELP ME PLS HELP ME PLS HELP ME PLS HELP ME PLS HELP ME PLS HELP ME PLS HELP ME PLSHELP ME PLS
Answer:
A
Explanation:
Answer:
A! have a wonderful day!
Explanation:
How many grams of KNO3 would recrystallize from 100 g of water, if a saturated solution were cooled from 50 degrees celcius to 20 degrees celcius?
Answer:
[tex]m_{cryst}=58g[/tex]
Explanation:
Hello there!
In this case, according to the attached solubility chart, it is possible for us to realize that about 88 grams of KNO3 are soluble at 50 °C but just 30 grams are soluble at 20 °C in the same 100 g of water.
In such a way, the crystalized mass of this solute can be calculated by subtracting the mass at 50 °C and the mass at 20 °C:
[tex]m_{cryst}=88g-30g\\\\m_{cryst}=58g[/tex]
Best regards!
two copper pennies has a mass of 6.64g how many moles of copper do they contain
Answer:
It contains 0.105 mole cu
Explanation:
2. Can you say that the matter which underwent a chemical change is still the
same substance as before? Why?
Answer:
No
Explanation:
A chemical change is a change that involves a change in the chemical composition of matter. A new substance is formed. In a chemical change, new chemical and physical properties of the substance are formed. In a chemical change, the chemical and physical properties of the substance formed will be different from the original substance.
The matter which underwent a chemical change is not still the same substance as before.
What is Chemical change?This is the type of change which occurs when two substances known as reactants react to form a new product.
The formation of a new product through bonding and other parameters thereby makes the substance to be different as it was before.
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why is detergent called soapless soap
Answer:
Detergents are referred to as soapless soaps because they have a washing action similar to soap but do not contain the typical chemical contents of soaps, such as sodium or potassium salts of long chain fatty acids.
Explanation:
QUE VENTAJAS TIENE PARA LA PLANTA Y EL CULTIVO LA PERMANENCIA DEL POTASIO COMO CATION MONOVALENTE (K+)?
Explanation:
Son muchos los beneficios del catión monovalente (K+) en las plantas y cultivos, mencionaremos algunos:
-Interviene en el proceso de apertura y cierre de los estomas; el catión (k+) ayuda a que los estomas puedan realizar correctamente el proceso de la fotosíntesis es decir la absorción del dióxido de carbono para producir oxígeno y agua; este proceso ayuda a que la planta pueda fabricar su propio alimento es decir transformar materiales inorgánicos en orgánicos como azúcares y carbohidratos que son aprovechables por la planta para realizar diversas funciones catalíticas como la respiración celular,la fosforilación y la síntesis de proteínas; este proceso también contribuye a que la planta pueda almacenar y retener suficiente agua lo cual ayuda a evitar el estrés hídrico en la planta.
Por lo tanto si la planta tiene una buena concentración de potasio como catión monovalente(k+); es posible que tenga un buen crecimiento y desarrollo radicular ,así mismo la calidad de los cultivos será muy buena,seran cultivos muy nutritivos y saludables. Algunos cultivos que necesitan una alta cantidad de potasio son los cítricos y el banano.
Where can you find the atomic mass?
Answer:
To calculate the atomic mass of a single atom of an element, add up the mass of protons and neutrons. Example: Find the atomic mass of an isotope of carbon that has 7 neutrons. You can see from the periodic table that carbon has an atomic number of 6, which is its number of protons.
Explanation:
To calculate the atomic mass of a single atom of an element, add up the mass of protons and neutrons. Example: Find the atomic mass of an isotope of carbon that has 7 neutrons. You can see from the periodic table that carbon has an atomic number of 6, which is its number of protons.
Gallium is a metallic element in Group III. It has similar properties to aluminium.
(a) (i) Describe the structure and bonding in a metallic element.
You should include a labelled diagram in your answer.
Answer:
Gallium has Orthorhombic and forms ionic bonds with metals
Explanation:
The structure of gallium is Orthorhombic and it has a high neutron capture cross section. It is very stable in dry air but oxidizes in moist air. It reacts with oxygen to form Ga2O3. It has a valence of III. Its electronic configuration is
Ar 3d10 4s2 4p1
It is found in the 3A group of periodic table and it mostly forms ionic bonds with metal.
Predict whether a reaction will occur when HClO and Sr(OH)2 solutions are mixed, if yes determine spectator ions in the ionic equation.
Answer:
[tex]ClO^-\\\\Sr^{2+}[/tex]
Explanation:
Hello there!
In this case, according to the reaction between hypochlorous acid and strontium hydroxide which yields stontium hypochlorite and water as a neutralization reaction:
[tex]2HClO(aq)+Sr(OH)_2(aq)\rightarrow Sr(ClO)_2(aq)+2H_2O(l)[/tex]
Thus, since HClO is a weak acid, it is not fully ionized so the complete ionic equation turns out to be:
[tex]2H^++2ClO^-+Sr^{2+}+2(OH)^-\rightarrow Sr^{2+}+2(ClO)^-+2H_2O(l)[/tex]
Whereas the spectator ions, which remain the same at both sides of the equation, are:
[tex]ClO^-\\\\Sr^{2+}[/tex]
Best regards!
A gas is collected at 20.0 °C and 725.0 mm Hg. When the temperature is
changed to 0 °C, what is the resulting pressure?
Answer:
676mmHg
Explanation:
Using the formula;
P1/T1 = P2/T2
Where;
P1 = initial pressure (mmHg)
P2 = final pressure (mmHg)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the information provided in this question;
P1 = 725.0mmHg
P2 = ?
T1 = 20°C = 20 + 273 = 293K
T2 = 0°C = 0 + 273 = 273K
Using P1/T1 = P2/T2
725/293 = P2/273
Cross multiply
725 × 273 = 293 × P2
197925 = 293P2
P2 = 197925 ÷ 293
P2 = 676mmHg.
The resulting pressure is 676mmHg
advantages of greenhill
Answer:
The correct answer is - explained below.
Explanation:
Greenhills are the home for the natural vegetation and animals that can be destroyed by the invasion of humans, however, there are many adavntages of Greenhills. The advantage of the Greenhill are as follows:
- Greenhills is the place that doesn’t flood easily
- these geographical areas are stable for the past hundred years
- It's a good building site because homes have already been built there
- Greenhills shows very less amount of weathering
- Buildings can erode easily
- Prevent erosion and helps in water for farming
-It’s not a flat area so it’s harder to farm
-These are near the nature and habitat of various animals
Calculate the area of an applied force of 300 N and a pressure of 35 Pa? (the answer needs to be accurate with 2 decimal places!)
Answer:
Explanation: 1Pa 1 N/m^2. p = F/A and A = F/p = 300N /35 Pa = 8.57 m^2
I didn’t study for this lol if your answer correct I’ll mark ur answer brainliest
Answer:
3
Explanation:
3 is the answer is did this a little while ago
7. Marcie fills a graduated cylinder with 15.0mL of water. Paul finds the mass of a marble to be
2.21g, then drops the marble into the graduated cylinder. If the meniscus on the cylinder is
now at 16.3mL, what is the density of the marble?
Answer:
1.7 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
volume = final volume of water - initial volume of water
volume = 16.3 - 15 = 1.3 mL
We have
[tex]density = \frac{2.21}{1.3} = 1.7 \\ [/tex]
We have the final answer as
1.7 g/mLHope this helps you
Please help with this chem question I’ll mark you brainiest. The answer isn’t A) I already tried that option.
Explain the difference between a covalent bond formed between two atoms of the same element and a covalent bond between two atoms of two different elements.
Answer:
Polarity
Explanation:
Covalent bonds between two atoms of the same element (diatomics) are nonpolar because neither atom is more electronegative. Covalent bonds between atoms of two different elements are often polar and must be polar to some extent because of differences in electronegativity between the two atoms involved.
Potato farmers in Ireland during the mid 1800s all grew the same type of potato. The potato plants were all produced as clones of one another. When a fungus infected the crop, all of the potatoes were destroyed. This occurred because these potato plants
Answer:
The crop failures were caused by late blight, a disease that destroys both the leaves and the edible roots, or tubers, of the potato plant.