Answer:
Heat gained by 1.25 grams of ice is 250 joules
Explanation:
As we know
[tex]Q = mc\Delta[/tex]T
Where
[tex]\Delta[/tex]T is the change in temperature
Water freezes at 273.15 K/0 degree Celsius, and it boils at 373.15 K/00 degree Celsius,
[tex]\Delta[/tex]T
m is the mass in grams
c is the specific heat of water (ice) = 2.05 joules/gram
Substituting the given values, we get -
[tex]Q = 1.25 * 2.0 * 100\\Q = 250[/tex]Joules.
A sample of gas with a volume of 5.0 m3 at a temperature of 298 K and a pressure of 0.84 atmospheres is left in a closed container where the temperature increases to 323 K and the pressure increases to 0.89 atmospheres. What is the new volume of a gas sample?
Answer:
5.12 m³
Explanation:
Using the combined gas law formula as follows:
P1V1/T1 = P2V2/T2
Where;
P1 = initial pressure (atm)
P2 = final pressure (atm)
V1 = initial volume (m³)
V2 = final volume (m³)
T1 = initial temperature (K)
T2 = final temperature (K)
According to this question;
V1 = 5.0 m³
V2 = ?
P1 = 0.84 atm
P2 = 0.89 atm
T1 = 298 K
T2 = 323 K
Using
P1V1/T1 = P2V2/T2
0.84 × 5/298 = 0.89 × V2/323
4.2/298 = 0.89V2/323
Cross multiply
4.2 × 323 = 298 × 0.89V2
1356.6 = 265.22V2
V2 = 1356.6 ÷ 265.22
V2 = 5.12 m³
¿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.
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
If 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
Which air mass would be cold and wet?
Group of answer choices
mP
mT
cT
cP
A
Answer: mP
Explanation:
Maritime polar forms cold water and the weather is cold and wet.
;)
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
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.
Students in a science class prepared flash cards so that they could quiz one another about the
arrangement of the periodic table. One of the flash cards contained information about two
elements, Element L and Element M.
Qualities:
-Atom of element M has two more balances electrons than element atoms of L
- atoms of element L are more reactive than atoms of element M
-both elements are metals
The students had to use the information on n the flash cards to determine possible positions of the two elements on a blank periodic table. Which periodic table has the elements placed in the locations that match the information on the flash cards?
Answer:
the periodic table is G.
The periodic table has the elements placed in the locations that match the information on the flash cards is F.
What is periodic table?The term "periodic table" refers to an arrangement of all known elements in order of increasing atomic number and recurrent chemical attributes. The periodic table is organized into 118 elements.
The term "periodic table" can also refer to a table that lists all known chemical elements in rows and columns.
In the F table, L is found in alkaline earth metals while M is found in transition metals. M has more valence electrons than L, while L is more reactive than M.
Thus, the periodic table has the elements placed in the locations that match the information on the flash cards is F.
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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 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 color does a green objcet appear under red light
Answer:
black??
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
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
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Elements
Hydrogen (H
Helium (4)
lithium (li)
Berylium (BE)
Boron (B)
Carbon (c)
Nitrogen (N)
Oxygen (0)
Flaarine (F)
Neon (Nes
sodium (Na)
Magnesium (My
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Is the explanation of phenomena through the use of several Investigations or a scientific method.
O hypothesis
O scientific theory
O scientific law
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
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:
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:
topic:
surface area
(multiple choice)
irrelevant answers will be reported
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 ☺️
If you start with 50 grams of H2O how much NaOH would you produce
2 Na + 2 H2O = 2 NaOH + H2
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
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
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
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:
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
identify the state of matter in the box,
Answer:
gas
Explanation:
particles are very far apart
The given diagram represents gaseous state of matter. Both a volume and a definite form are absent from a gas. The separation of gas particles is great.
What is state of matter?Solids, liquids, gases, plus plasma are the four states of matter that may be found in daily life. However, a number of additional states of matter have indeed been found.
Some of these additional states are created when a material transitions among two states of matter and doesn't actually exhibit the characteristics of either state. The most exotic are others. Both a volume and a definite form are absent from a gas. The separation of gas particles is great. The gas in a balloon and the air are two examples of gases. The given diagram represents gaseous state of matter.
Therefore, the given diagram represents gaseous state of matter.
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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 present3C6H206
How many atoms are there? Help ASAP!
Answer:
the answer to this is 74 :)