Answer:
Global warming stresses ecosystems through temperature rises, water shortages, increased fire threats, drought, weed and pest invasions, intense storm damage and salt invasion, just to name a few.
Explanation:
Global warming stresses ecosystems through temperature rises, water shortages, increased fire threats, drought, weed and pest invasions, intense storm damage and salt invasion, just to name a few.
how many ml of 12.0 m hcl are needed to prepare 1200 ml of a 0.10 M solution of hcl
This means that if you know how many moles of solute you have in the target solution, you also know how many moles of solute were present in the stock solution sample.
Use the molarity and volume of the target solution to determine how many moles of hydrochloric acid,
HCl
, you need in that solution
c
=
n
V
⇒
n
=
c
⋅
V
n
HCl
=
0.10 M
⋅
500
⋅
10
−
3
L
=
0.050 moles HCl
Now the question is - what volume of stock solution would contain this many moles of hydrochloric acid?
c
=
n
V
⇒
V
=
n
c
V
stock
=
0.050
moles
12
moles
L
=
0.0041667 L
I'll leave the answer rounded to two sig figs, despite the fact that you only gave one sig fig for the volume of the target solution
V
stock
=
4.2 mL.follow me
5 Facts about cell division
Define the law of conservation of charge and provide an example.
Define opposite charges attract and like charges repel and provide an example.
Define Electricity along with an example.
Answer:
Conservation of Charge is the principle that the total electric charge in an isolated system never changes. The net quantity of electric charge, the amount of positive charge minus the amount of negative charge in the universe, is always conserved.
Please help I'm not sure what the answers are
Answer:
An element's mass number (A) is the sum of the number of protons and the number of neutrons. The small contribution of mass from electrons is disregarded in calculating the mass number.
Put the following in order from largest to smallest.
Chromosome, gene, nucleus, cell, DNA
Answer:
cell, nucleus , chromosome, DNA, gene
Se mezclan 20 gramos de agua (1cal/g°C) a 40 °C con 15 gramos de alcohol (0,58cal/g°C) a 30 °C. ¿Cuál ha sido la temperatura de equilibrio térmico?
Answer:
[tex]T_{EQ}=37\°C[/tex]
Explanation:
¡Hola!
En este caso, para los problemas de equilibrio térmico, consideramos que la energía liberada por la sustancia que inicialmente está caliente (agua), es absorbida por la sustancia que inicialmente está fría (alcohol); thus, we can write:
[tex]Q_{agua}=-Q_{alcohol}[/tex]
La cual puede ser escrita en términos de masa, calor specifico y temperaturas:
[tex]m_{agua}C_{agua}(T_{EQ}-T_{agua})=-m_{alcohol}C_{alcohol}(T_{EQ}-T_{alcohol})[/tex]
De este modo, al resolver para la temperature de equilibrio térmico, obtenemos la siguiente expresión:
[tex]T_{EQ}=\frac{m_{agua}C_{agua}T_{agua}+m_{alcohol}C_{alcohol}T_{alcohol}}{m_{agua}C_{agua}+m_{alcohol}C_{alcohol}}[/tex]
Así, al reemplazar los valores en esta, obtenemos:
[tex]T_{EQ}=\frac{(20g)(1cal/g\°C)(40\°C)+(15g)(0.58cal/g\°C)(30\°C)}{(20g)*(1cal/g\°C)+(15g)(0.58cal/g\°C)} \\\\T_{EQ}=37\°C[/tex]
¡Saludos!
Aluminium is a metal give reason
Answer:
Aluminium is ordinarily classified as a metal. It is lustrous, malleable and ductile, and has high electrical and thermal conductivity. Like most metals, it has a close-packed crystalline structure and forms a cation in an aqueous solution.
Se midió el pH de una muestra del agua de lluvia en la ciudad de México, y se obtuvo un valor de 3.5 Calcula la [H+] en dicha muestra.
Answer:
[tex][H^+]=3.16x10^{-4}M[/tex]
Explanation:
¡Hola!
En este caso, dado que el pH de una solución se entiende como el potencial de los iones hidrógeno en la misma, es posible recordar la ecuación que se usa para calcularlo:
[tex]pH=-log([H^+])[/tex]
De este modo, al conocer el pH, se resuelve para la concentración de iones hidrógeno como se muestra a continuación:
[tex][H^+]=10^{-pH}[/tex]
Así, reemplazamos el pH para obtener:
[tex][H^+]=10^{-3.5}=3.16x10^{-4}M[/tex]
¡Saludos!
name four methods of separating mixtures
Answer:
Chromatography
Distillation
Evaporation
Filtration
Explanation:
Chromatography involves solvent separation on a solid medium.
Distillation takes advantage of differences in boiling points.
Evaporation removes a liquid from a solution to leave a solid material.
Filtration separates solids of different sizes.
Mixtures can be physically separated by using methods that use differences in physical properties to separate the components of the mixture, such as evaporation, distillation, filtration and chromatography.
help me help me help me
Answer:
i dont know i do this for points
Explanation:
solid liquid and gas is physical or chemical explain
Answer: Physical change
Explanation: I said physical change because its changing the form of the substance and also solid to gas are sublimating
Is riding the bus or riding a bike a quicker way to get to school?
Substances have a fixed arrangement of atoms. true or false (NO LINKS PLEASE)
Answer:
True
Explanation:
how many grams of salt are in 5 l of a solution with a concentration of 3 g/L
Answer: 15 grams of salt are there in 5 L of solution.
Explanation:
Concentration of a solution is defined as the number of grams of solute dissolved per liter of the solution.
Given : Concentration of solution : 3 g/L
1 Liter of solution contains = 3 gram of salt
Thus 5 L of solution contains = [tex]\frac{3g}{1L}\times 5L=15g[/tex]
Thus 15 grams of salt are there in 5 L of solution.
A truck has a kinetic energy of 1200j and is traveling at 9 m/s what is the truck mass
Answer:
Mass of truck = 29.62 kg (Approx.)
Explanation:
Given:
Kinetic energy = 1200 J
Speed of truck = 9 m/s
Find:
Mass
Computation:
The kinetic energy of a thing is the force that has attributable to its movement in physics.
Kinetic energy = [1/2][m][v]²
1,200 = [1/2][m][9]²
1,200 = [1/2][m][81]
Mass of truck = 29.62 kg (Approx.)
How many moles are in 19.82 g Mg?
Which of these objects is made of cells?
A. rocks B. snow C. trees D. water
Answer:
I think it's trees
Explanation:
I'm not 100% sure tho
What is the pH of a solution that has 7.8x10-9 [H+]?
Answer:
8.11
Explanation:
pH = -log[H+]
pH = -log[7.8 x [tex]10^{-9}[/tex]]
pH = 8.107905...
pH = 8.11
PLZ HELP!
Are water waves transverse or longitudinal? How do you know? IN YOUR OWN WORDS.
Explanation:
Transverse waves are always characterized by particle motion being perpendicular to wave motion. A longitudinal wave is a wave in which particles of the medium move in a direction parallel to the direction that the wave moves.
A sample of neon gas occupies a volume of 752ml at 25 degrees Celsius. What
volume will the gas occupy at 50 degrees Celsius if the pressure remains
constant?
Answer:
The volume of the gas will be 814 mL.
Explanation:
An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.
The gas laws are a set of chemical and physical laws that allow determining the behavior of gases in a closed system. The parameters evaluated in these laws are pressure, volume, temperature and moles.
Charles's Law consists of the relationship that exists between the volume and the temperature of a certain quantity of ideal gas, which is kept 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]
It is desired to study two different states, an initial state and an final state. You have a gas that is at a volume V1 and at a temperature T1 at the beginning of the experiment. When the temperature varies to a new T2 value, then the volume will change to V2, and the following will be true:
[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]
In this case:
V1= 752 mLT1= 25 C= 298 K (being 0 C= 273 K)V2= ?T2= 50 C= 323 KReplacing:
[tex]\frac{752 mL}{298 K} =\frac{V2}{323 K}[/tex]
Solving:
[tex]V2= 323 K*\frac{752 mL}{298 K}[/tex]
V2= 815 mL
The volume of the gas will be 814 mL.
um...id.k how to do chemistry...help please?
Answer:
NaBr
Explanation:
Answer:
um...id.k how to do chemistry...help please?
Explanation:
NaBr
At another temperature, the rate constant is 3.25 M-2 s-1. What is the rate at this temperature for the
given concentrations?
Answer:
It's 0.00015
Explanation:
got it right on edge 2021
HELP ASAP plz!:) I’ll give brainliest
Answer:
it is closer to the south pole
Explanation:
9. What happens to the cell outside of the nucleus when the virus has been copied so many times? a. The cell fights back b. The cell gets help from its neighbor cells C. The cell gets help from white blood cells d. The cell is destroyed
Answer: it think the answer is c.) The cell gets help from white blood cells or b.) The cell gets help from its neighbor cells.
Explanation:
In addition to showing the ratio of atoms in a molecule, what else do the subscripts in a formula tell us?
Answer:
See explanation
Explanation:
Usually, when we write a chemical formula for any compound or other chemical specie, we use subscripts to;
Indicate the ratio of atoms of each element present in the compound or chemical specieShow the number of atoms of each element present in the compound or chemical specie.Hence, the subscripts written after chemical formulas have more than one function as described above.
In H2SO4 for instance, there are two hydrogen atoms, one sulphur atom and four oxygen atoms as shown in the chemical formula.
Consider the following balanced equation:
2KCIO3(s) → 2KCl(s) + 302(g)
How many moles of O2 will be obtained by decomposing
3.50 moles of KCIO3?
0.530 mole
O 3.00 moles
O 2.30 moles
5.25 moles
5.25 moles
General Formulas and Concepts:Chemistry
Atomic Structure
CompoundsMolesAqueous Solutions
States of matterStoichiometry
Analyzing reactions RxNUsing Dimensional AnalysisExplanation:Step 1: Define
[RxN - Balanced] 2KClO₃ (s) → 2KCl (s) + 3O₂ (g)
[Given] 3.50 mol KClO₃
[Solve] mol O₂
Step 2: Identify Conversions
[RxN] 2 mol KClO₃ (s) → 3 mol O₂ (g)
Step 3: Stoichiometry
[DA] Set up conversion: [tex]\displaystyle 3.50 \ mol \ KClO_3(\frac{3 \ mol \ O_2}{2 \ mol \ KClO_3})[/tex][DA} Multiply [Cancel out units]: [tex]\displaystyle 5.25 \ mol \ O_2[/tex]A buffer is made with 0.493 M of the weak base methylamine ([tex]CH3NH2[/tex]) with 0.493 M [tex]CH3NH3Cl[/tex] (KA = 5.6 x 10^-4)
What is the pH of this buffer system?
If 0.100 M HBr is added to the buffer, what is the pH?
h^ ar hidrojen oksijen azot helyum
A bicycle tire holds 1.50 L of air at 5atm and 20.0 °C. How many moles of air is this?
If the average mass of air is 29.0 g/mol, what is the mass of air in the tire?
Answer:
9.05 g
Explanation:
PV=nRT
Use the ideal gas equation. Substitute values.
P = 5 atm
V = 1.50 L
n = ?
R (gas constant) = 0.08206 L-atm/mol-K
T = 20.0°C
*Always convert °C to K.
T = 20.0° + 273 = 293K
Substitute values.
(5 atm)(1.50 L) = n(0.08206 L-atm/mol-K)(293K)
n = (5 atm)(1.50 L) / (0.08206 L-atm/mol-K)(293K)
n = 0.3119335... mol
Convert to grams with the given average mass of air.
0.3119335... mol x (29.0 g/1 mol) = 9.05 g
Gerald's science teacher mixed liquid X and liquid Y, both at room-temperature, in a large beaker. two beakers of clear solutions to the left of a right-pointed arrow, and a large beaker with a clear solution to the right of the arrow The mixture in the large beaker still looked clear like water, but when the students, one at a time, carefully touched the outside of the large beaker, it felt warm to the touch. Why did the large beaker most likely feel warm? A. The two liquids were not soluble in water. B. The release of a gas heated the solution. C. A chemical reaction produced a new substance. D. The energy of mixing warmed the liquids.
Answer:
c
Explanation:
A chemical reaction produced a new substance. In a chemical reaction, the atoms that make up the reactants are rearranged to produce various products.
What is chemical reaction?chemical reaction, the transformation of one or more chemicals (the reactants) into one or more distinct compounds (the products). Chemical elements or chemical compounds make up substances.
A chemical reaction is one in which two or more reactants will react to form a new substance. When new substance will form it will produce heat. Therefore, when science teacher was mixing two liquids it was generating heat.
Heating a substance allow molecules to move faster. When heat is given to the object it will move fast. When heat will apply to a solid it will turn into liquid. When heat is supplied to the liquid it will turn into gas.
Therefore, A chemical reaction produced a new substance. In a chemical reaction, the atoms that make up the reactants are rearranged to produce various products.
To learn more about chemical reaction, refer to the link:
https://brainly.com/question/22817140
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What variable represents thermal energy in the equation Q = mcΔT?
A.
The variable c
B.
The variable Q
C.
The variable T
D.
The variable m
Answer:
The variable Q
Explanation:
i just took the test and got it right.... i hope this helps :)
The variable Q represents thermal energy in the equation Q = mcΔT. Hence, option B is correct.
What is specific heat capacity?The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases by 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).
Q = mcΔT
Q = heat energy
m = mass
c = specific heat capacity
ΔT = change in temperature
Hence, option B is correct.
Learn more about specific heat capacity here:
brainly.com/question/2530523
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