Why must a special saw be used when removing a cast?
A. Because it is very painful to have a cast removed.
B. Because a cast is made of material that requires a special saw.
C. Because a regular saw is not strong enough to cut the cast.
D. Because a regular saw might cut a person’s skin.
Why particles start vibrating in solids?
it's argent
Explanation:
The particles of matter are continuously in motion due to which tehy collide with each other, and this creates a vibration in the solids
I hope it is correct ☺️
What is the new pressure?
kPa
Answer:
1 kPa = 760/101.325 = 7.5 mmHg; atm = atmosphere; kPa = kilo Pascal; mmHg = millimetres of mercury.
Answer:
5,000
Explanation:
ed2021
3C6H206
How many atoms are there? Help ASAP!
Answer:
the answer to this is 74 :)
Mass of Material
in Beaker
350.0 g
Initial Temperature
419°C
Final Temperature
30.9°C
Using the specic heat and the mass of the water, Camille
calculated that the water absorbed 16.4 kJ of heat. What is
the specific heat of the liquid in the beaker?
Select one
O4260
o 1800 kg
O 3850 kg
O 7570
¿Cual es porcentaje de una solucion que contiene 10g de sal disueltos en 500 mL de solución?
Answer:
0.02 g/ml
Explanation:
si dividimos 10 con 500, es decir, 10/500, obtenemos 0.02. Las unidades serán g / ml.
an example of no chemical reaction occurring
in gizmos
Answer:
Hydrogen + Helium
Explanation:
No reaction occurs
explain two ways that bills penguin toy is similar to the water cycle
All the water on the earth is the same water that has been here since
BRAINLISTAll the water on the planet is the identical water that has been here since Penguins preen their feathers continually.
What is the water cycle?
Feathers must be defended in prime condition to provide insulation and waterproofing.
Penguins groom with their bills. A gland around the bottom of the tail secretes oil that the penguin distributes throughout its feathers.
Penguins preen for several minutes in the water by stroking their bodies with their flippers while turning and twisting.
Penguins preen to maintain their feathers in head circumstances and are waterproof. On a well-groomed penguin, moisture rarely touches the skin.
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How many flourine atoms are present in 5.3 grams of flourine sample? (note that you have to use the 3 step method)
Answer:
1.7x10²³ Fluorine atoms are present
Explanation:
To solve this question we must know that, to find the amount of atoms of a substance from its mass, we have, as first, to convert this mass to moles using molar mass of the substance. With the moles we can find the amount of molecules using Avogadro's number. And with the formula we can know the atoms presents:
Moles Fluorine (F₂, Molar mass: 37.997g/mol)
5.3g * (1mol / 37.997g) = 0.139 moles F₂
Molecules F₂:
0.139 moles F₂ * (6.022x10²³molecules / mol) = 8.4x10²² molecules F₂
As 1 molecule of F₂ contains 2 atoms of Fluorine:
8.4x10²² molecules F₂ * 2 =
1.7x10²³ Fluorine atoms are presentIf I have an unknown quantity of gas at a pressure of 204.83 kPa, a volume of 27.88 liters, and a temperature of 8.76°C , how many moles of gas do I have?
Answer:
700
Explanation:
How to find
Multiply the volume and pressure and divide the product by the temperature and the molar gas constant to calculate the moles of the hydrogen gas.
Solve: 204.83 × 27.88 / 8.76 = 651.901872146
Which is 651.90
In the nearest hundredths, the moles of gas is 700
how much heat is required to increase the temperature of 20 grams of water by 26 degrees celsius?
Answer: 2175.68 J heat is required to increase the temperature of 20 grams of water by 26 degrees celsius.
Explanation:
Given: Mass = 20 g
Change in temperature = [tex]26^{o}C[/tex]
The standard value of specific heat of water is [tex]4.184 J/ g^{o}C[/tex]
Formula used to calculate the heat energy is as follows.
[tex]q = m \times C \times \Delta T[/tex]
where,
q = heat energy
m = mass of substance
C = specific heat of substance
[tex]\Delta T[/tex] = change in temperature
Substitute the values into above formula as follows.
[tex]q = m \times C \times \Delta T\\= 20 g \times 4.184 J/g ^{o}C \times 26^{o}C\\= 2175.68 J[/tex]
Thus, we can conclude that 2175.68 J heat is required to increase the temperature of 20 grams of water by 26 degrees celsius.
What effect does an increase in carbon dioxide (CO 2 ) have on the concentration of hydrogen ions (H^ + ) in the blood?
Answer:
As the level of carbon dioxide in the blood increases, more H+ is produced and the pH decreases. This increase in carbon dioxide and subsequent decrease in pH reduce the affinity of hemoglobin for oxygen. The oxygen dissociates from the Hb molecule, shifting the oxygen dissociation curve to the right.
which detail about globalr clusters does photograhp on page 1 mke clear
Answer:
Globular clusters are densely packed collections of ancient stars. Roughly spherical in shape, they contain hundreds of thousands, and sometimes millions, of stars. Studying them helps astronomers estimate the age of the universe or figure out where the center of a galaxy lies.
Explanation:
Ca + AgCl (Single Replacement Reactions) PLEASE HELP
Answer:
2Ag + CaCl2
Explanation:
https://en.intl.chemicalaid.com/tools/equationbalancer.php?equation=Ca+%2B+AgCl+%3D+Ag+%2B+CaCl2 use that website for chemistry
ALEX RODE HIS BIKE
60 km in 4 Hours. How FAST WAS HE GOING
Answer:
15 km/hour
Explanation:
You need to find how fast he was going per hour.
Answer: 15
Divide. 60 ÷ 4
This gives us 15. So, Alex was going 15 mph
18) Calculate the molarity
of a solution if 42 grams
of NaCl is dissolved in
780 mL of water.
a .56 M
b 92 M
c 1.1 M
d 54M
Answer:
B. 0.92 M
Explanation:
Molarity of a solution = number of moles (n) ÷ volume (V)
According to the information provided in this question;
mass of NaCl = 42g
Volume of water = 780mL
Using mole = mass/molar mass
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol
mole = 42/58.5
mole (n) = 0.72mol
Volume (V) = 780 mL = 780/1000 = 0.780 L
Hence, molarity = n/V
Molarity = 0.72/0.780
Molarity = 0.923 M
you have a coin with a volume of 10cm3 and a mass of 23g. What is the density of the coin
Answer:
2.3 grams per cubic cm
Explanation:
Density is equal to mass over volume, so
23/10=2.3
If you start with 50 grams of H2O how much NaOH would you produce
2 Na + 2 H2O = 2 NaOH + H2
List three strategies for answering questions that you don't know anything
about?
Help please I'll give brainless no links, please I've been asking this question from this morning, and no one answer
how do you make a potion of slow falling
Answer:
So you can make it longer by putting in some redstone. And this will give you a potion that will last for 4 minutes. Alright we're done it's got 4 minute slow falling potions.
Explanation:
Answer:
Ok, to make a slow falling potion, you need 1 water bottle, 1 nether wart, and 1 fantom membrane.
Explanation:
hope I could help, lmk if I did!
A(n)
Is the explanation of phenomena through the use of several Investigations or a scientific method.
O hypothesis
O scientific theory
O scientific law
A 26.0 g sample of HCl is dissolved using 1.00 L of water. Calculate the
molarity of this solution. (HCI molar mass: 36.0 g/mol)
Answer:
[tex]\boxed {\boxed {\sf molarity \approx 0.722 \ M \ HCl}}[/tex]
Explanation:
Molarity is the concentration measurement equal to moles per liter.
[tex]molarity=\frac{moles}{liters}[/tex]
We have 26.0 grams of HCl and 1.00 liters of water. We must convert grams of HCl to moles.
To convert from grams to moles, the molar mass is used. Usually we find these values on the Periodic Table, but they are already provided. The molar mass of hydrochloric acid is 36.0 grams per mole. Use this number as a ratio.
[tex]\frac {36.0 \ g \ HCl}{ 1 \ mol \ HCl}[/tex]
Multiply by the given number of grams: 26.0
[tex]26.0 \ g \ HCl *\frac {36.0 \ g \ HCl}{ 1 \ mol \ HCl}[/tex]
Flip the ratio so the grams of hydrochloric acid cancel.
[tex]26.0 \ g \ HCl *\frac {1 \ mol \ HCl}{ 36.0 \ g \ HCl}[/tex]
[tex]26.0 *\frac {1 \ mol \ HCl}{ 36.0 }[/tex]
[tex]\frac {26.0}{ 36.0 } \ mol \ HCl = 0.72222222222 \ mol \ HCl[/tex]
Now we know the moles and liters.
0.72222222222 mol HCl 1.00 LSubstitute these values into the molarity formula.
[tex]molarity = \frac {0.72222222222 \ mol \ HCl}{1.00 \ L }[/tex]
[tex]molarity = 0.72222222222 \ mol \ HCl/L[/tex]
The original measurements of grams and liters have 3 significant figures, so our answer must have the same. For the number we calculated, that is the thousandth place.
0.72222222222The 2 tells us to leave the 2 in the thousandth place.
[tex]molarity \approx 0.722 \ mol \ HCl/ L[/tex]
1 mole per liter is equal to 1 molar, or M. Change the units.
[tex]molarity \approx 0.722 \ M \ HCl[/tex]
The molarity of this solution is approximately 0.722 M HCl
What is a practically insignificant reaction?
Answer:
Practical significance refers to the magnitude of the difference, which is known as the effect size. Results are practically significant when the difference is large enough to be meaningful in real life. ... Very small differences will be statistically significant with a very large sample size.
Explanation:
Hope it helps
FOLLOW MY ACCOUNT PLS PLS
A una mezcla de 300g, formada con 60% P/P de Hierro y 40% P/P de Arena, se le adicionan 135g de Cobre y 2,77g de Aluminio. ¿Cuál es la concentración final P/P de cada uno de los componentes?
Answer:
[tex]\%P/P_{hierro}=41.1\%\\\\\%P/P_{arena}=24.4\%\\\\\%P/P_{cobre}=30.8\%\\\\\%P/P_{aluminio}=0.6\%[/tex]
Explanation:
¡Hola!
En este caso, dado que estamos tratando con problem sobre porcentaje peso/peso de hierro, arena, cobre y aluminio, primero debemos calcular la masa inicial de estos dos primeros en la mezcla original de acuerdo con:
[tex]m_{hierro}=300g*0.60=180g\\\\m_{arena}=300*0.40=120g[/tex]
Ahora si podemos calcular la masa de la mezcla final como la suma de las masas de todos los constituyentes de la mezcla:
[tex]m_T=180g+120g+135g+2.77g=437.77g[/tex]
Finalmente, podemos calcular los porcentajes P/P como se muestra a continuación:
[tex]\%P/P_{hierro}=\frac{180g}{437.77g} *100\%=41.1\%\\\\\%P/P_{arena}=\frac{120g}{437.77g} *100\%=24.4\%\\\\\%P/P_{cobre}=\frac{135g}{437.77g} *100\%=30.8\%\\\\\%P/P_{aluminio}=\frac{g}{437.77g} *100\%=0.6\%[/tex]
¡Saludos!
Belle’s grandfather lives in a region where the temperature drops below 0°F at night. When Belle visited her grandfather, they hiked up a hill. Belle noticed that a lot of rocks had cracks in them. She also found quite a few rocks that had split into pieces. What most likely caused the rocks in this region to weather?
Answer : Normally all molecular motions seizes at 0k which is -272oC so the temperature can't go below that
Explanation:
But, the rocks cracked because of too much expansion. Generally at night, water can be found within rocks which then evaporates during the day. And when water is cold or freezed it expands. So, as the water in the rock expands it causes an increase in size until a certain level where it can no more expand, it cracks.What causes the split of the rock is due to the expansion of water as it freezes
Answer:The answer is B
Explanation:
Fossil fuels produce energy by being burned and produce which of the following emissions?
A. CO and 03
B.H20 and NO2
C.03 and water vapor
D.CO2 and water vapor
Among all the given options, option d is correct options. Fossil fuels developed from the organic remnants of ancient plants and animals.
What are Fossil fuels?Fossil fuels are vital natural resources, as is widely known. They provide significant benefits to humanity, and we depend on them for energy. However, using fossil fuels has drawbacks as well.
Fossil fuels developed from the organic remnants of ancient plants and animals. The heat and pressure of the crust caused Earth to transform these million-year-old leftovers into fuels that include carbon.
The need for energy only increased after the Industrial Revolution. Similar to that, these fuels have had the ability to generate enormous amounts of energy to meet this need.
Therefore, the correct option is option D.
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An ideal gas contained in 5.0 liter chamber at a temperature of 37°C. If
the gas exerts a pressure of 2.0 atm on the walls of the chamber, which of
the following expressions is equal to the number of moles of the gas?
a.
(2.0)(5.0)
(2.0) (310)
b. (2.0)(0.0821)
(5.0) (37)
c.
(2.0) (0.0821)
(5.0) (310)
d.
(0.0821) (37)
(0.0821)(5.0)
e.
(2.0)(5.0)
(0.0821) (310)
Answer:
i am doing this in science also i would like to know if u know
Explanation:
How many grams of CaCl2 should be dissolved in 445.2 mL of water to make a 0.19 M solution of CaCl2?
In order to solve this, you will need to know how many moles of CaCl2 you will need, and to do so, you must look at the concentration of the solution.
You are told that the concentration of the solution is 0.19M, meaning that there is 0.19 moles of CaCl2 for every 1 liter of solution. However, you don't have 1 liter of solution, you have 445.2 mL. You must convert this to liters by dividing by 1000.
445.2 mL * (1 L / 1000 mL) = 0.4452 L
Now, you can solve for how many moles the solution must have. Since M = mol / L and you are given M and L, you can set up an equality as follows:
0.19M = mol / 0.4452 L
Now, in order to find the number of moles, you multiply both sides by 0.4452L
0.19M * 0.4452 L = moles = 0.084588mol
Now, you must calculate the molar mass of CaCl2 by using the periodic table
MM Ca = 40.078 g/mol
MM Cl = 35.452 g/mol
40.078 + (35.452 * 2) = 110.982 g/mol
Now you multiply the number of moles in the solution you calculated by the molar mass.
0.084588mol * 110.982 g/mol = 9.387 g CaCl2
what color does a green objcet appear under red light
Answer:
black??
Explanation:
A solution is prepared by dissolving 150. grams of NaCl in 500 milliliters of water. What is the
molarity of the solution?
Answer:
Explanation:
The answer should be .00500M
The molarity of the solution is = 5.12M
Molarity of the solutionThe molarity of a solution is the measures the number of moles of a solute per liter of a solution.
Molarity = moles solute/Liter solution
Molar mass of sodium (Na) = 23g
Molar mass of chlorine (Cl) = 35.5g
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol
To calculate the quantity of moles in 150g of NaCl,
1mol = 58.5g
xmol = 150g
Cross multiply,
xmol= 150×1/58.5
= 2.56mol
To convert 500mL to Liters,
500/1000 = 0.5 Liters
Substituting into the equation, Molarity = moles solute/Liter solution
Molarity= 2.56/ 0.5 = 5.12M
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