Answer:
An example of the thermal energy of a substance being decreased is with our food. With the thermal energy of food being decreased it is easier for foods to be eaten comfortably without any damage to the tongue or alimentary canal.
Another good example is in the handling of hot objects in the home. Thermal energy decrease in objects such as iron, pots etc helps to prevent serious burns and injuries.
Answer:
Water turning into ice
juice frozen to make popsicles
Explanation:
When something goes from liquid to a solid, that is a process called freezing. When a object loses thermal energy the particles move slower forming a solid.
The isotope of carbon used in archaeological dating is 14^6C . How many protons, neutrons, and electrons does an atom of 14^6C have?
Answer:
6
8
6
Explanation:
Isotope given:
¹⁴₆C
In specie written as this;
Superscript = Mass number
Subscript = Atomic number
To find the protons, it is the same as the atomic number;
Protons = Atomic number = 6
Neutrons have no charges;
Neutrons = Mass number - Atomic number =
Neutrons = 14 - 6 = 8
The number of electrons is the same as the atomic number = 6
which part of earth absorbs the most sunlight?
A oceans
b soil
c atmosphere
d rivers and lakes
Answer:
atmosphere
Explanation:
The atmosphere absorbs the most in light because the atmosphere surrounds our planet
Answer:
c
Explanation:
To prepare 380 mL of 0.500 M NaCl (MW = 58.5 g/mol), how many grams of sodium chloride is required?
11.12 grams of sodium chloride is required to prepare 380 mL of 0.500 M NaCl (MW = 58.5 g/mol).
HOW TO CALCULATE MASS:
The mass of a substance can be calculated by multiplying the number of moles of the substance by its molar mass. However, the number of moles of sodium chloride must first be calculated by multiplying the molarity by its volume. Molarity = no. of moles ÷ volume 0.500M = n ÷ 0.380Ln = 0.5 × 0.380n = 0.19molmass of NaCl = 58.5g/mol × 0.19molMass of NaCl = 11.12gTherefore, 11.12 grams of sodium chloride is required to prepare 380 mL of 0.500 M NaCl (MW = 58.5 g/mol).Learn more about how to calculate mass at: https://brainly.com/question/14948089?referrer=searchResults
WHAT PROBLEMS DID PRESIDENT JEFFERSON HAVE WITH TRIPOLI AND HOW DID HE SOLVE THEM
Answer:
Although Thomas Jefferson came to power determined to limit the reach of the federal government, foreign affairs dominated his presidency and pushed him toward Federalist policies that greatly contrasted with his political philosophy. The first foreign episode involved Jefferson's war with the Barbary pirates. For the previous century or so, Western nations had paid bribes to the Barbary states, which would later become Morocco, Algeria, Tunis, and Tripolitania, to keep them from harassing American and merchant ships
Explanation:
A nurse practitioner orders Medrol to be given 1.4 mg/kg of body weight. Medrol is an anti-inflammatory administered as an intramuscular injection. If a child weighs 71.6 lb and the available stock of Medrol is 20. mg/mL, how many milliliters does the nurse administer to the child? Express your answer to two significant figures and include the appropriate units.
The nurse give 2.3 ml Medrol to the child
Further explanationMass is one of the principal quantities, which is related to the matter in the object
The main mass unit consists of 7 units
kg, hg, dag, g, dg, cg, mg
Conversion :
1 Lb=0,453592 kg
For 71.6 lb :
[tex]\tt 71.6\times 0.453592=32.48~kg[/tex]
Medrol to be given 1.4 mg/kg of body weight, so amount for the child :
[tex]\tt 32.48~kg\times 1.4~mg/kg=45.472~mg[/tex]
The available stock of Medrol is 20. mg/mL, so the volume to the child :
[tex]\tt \dfrac{45.472}{20}=2.2736\approx2.3~ml[/tex]
How many liters of fat would have to be removed to result in a 5.2 lb weight loss? The density of human fat is 0.94 g/mL?
The body fat of humans can be measured by the density in grams per mL. The volume of the fat with a density of 0.94 g/mL and mass of 5.2 lb is 2.50 L.
What is volume?The volume is the factor of the dimension that inversely affects the density of the substance. The volume is given by the division of the mass by the density. It can be given in mL or cubic centimeters.
Given,
Mass of body fat = 5.2 lb
Density of human fat = 0.94 g/mL
At first, mass is converted from lb to grams as:
1 lb = 453.592 grams
So, 5.2 lb = 2358.68 grams
Secondly, volume is calculated as:
Volume = Mass ÷ density
V = 2358.68 grams ÷ 0.94 g/mL
= 2509.23 mL
Thirdly, volume from ml is converted to L as:
1 mL = 0.001 L
2509.23 mL = 2.50 L
Therefore, 2.50 liters of body fat has to be removed from the body.
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With ionic compounds, the ion charge is the same as the ___ number.
A. methylation
B. anion
C. cation
D. oxidation
Answer:
D. Oxidation
Explanation:
The oxidation state of a pure element is always equal to zero and the oxidation state for a pure ion is equivalent to its ionic charge.
1. How many moles of water molecules are there in 39 grams of Chlorine?
2. How many molecules are there in 39 grams of Gold?
Answer:
1. There is no moles of water in 39g of chlorine.
2. 1.19x10²³ molecules of Au.
Explanation:
First, we need to remember that molar mass of a compound represents the mass of 1 mole (6.022x10²³ molecules) of molecules.
Molar mass of Chlorine, Cl₂ is 70.9g/mol
Molar mass of gold, Au, is 197g/mol
1. Moles of 39g of Cl₂ are:
39g Cl₂ * (1mol / 70.9g) = 0.55 moles moles of chlorine
But there is no moles of water in 39g of chlorine.
2. First, moles of Au are:
39g Au * (1mol / 197g) = 0.198 moles Au.
Molecules are:
0.198 moles Au * (6.022x10²³ molecules / 1 mol) =
1.19x10²³ molecules of Au1. Which of the following statements describe cations? Select all that apply.
Positively charged ions.
Negatively charged ions.
They have lost electrons.
They have gained electrons.
Ions can be made by single element or covalently bonded group of elements. The covalently bonded group of elements is called polyatomic ions or polyatomic atoms. The correct option are option A,C.
What is Ions?
Any species that contain charge whether it is positive charge or negative charge is called ions. The example of polyatomic ions are sulfate, phosphate, nitrate etc.
Cation is the species that loose electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state.
Therefore the correct option are option A,C.
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(2 points) How many grams of K2SO4 are present in 25.0 mL of 7.00 % (m/v) solution?
Show your work. No work = no credit.
Mass of K₂SO₄ : 1.75 g
Further explanationThe concentration of a substance can be expressed in several quantities such as moles, percent (%) weight/volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.
volume of solution = 25 ml
% (m/v)=7%
mass of K₂SO₄ :
[tex]\tt \%m/v=\dfrac{mass~of~solute}{volume~of~solution}\times 100\%\\\\7\%=\dfrac{mass~K_SO_4}{25}\times 100\%\\\\mass~K_2SO_4=7\times 25\div 100=1.75~g[/tex]
Which is an example of a beneficial mutation?
one that changes the color of a rabbit, allowing it to hide from predators.
one that results in lighter flower petal colors without changing the plant’s ability to reproduce
one that causes a person’s body to produce thick mucus that clogs the lungs
one that makes it easier for a corn plant to contract a disease
Answer:
A
Explanation:
Answer: a
Explanation: one that changes the color of a rabbit, allowing it to hide from predators.
Which EMW can humans see?
Answer:
visible light waves are the only electromagnetic waves we can see
16.025 has how many sig fig
Answer:
5
Explanation:
Significant figures:
The given measurement have four significant figures 1234.
All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.
Leading zeros are not consider as a significant figures. e.g. 0.03 in this number only one significant figure present which is 3.
Zero between the non zero digits are consider significant like 104 consist of three significant figures.
The zeros at the right side e.g 2400 are also significant. There are four significant figures are present.
In given measurement:
16.025 there are 5 significant figures 1,6,0,2,5
How much ice could be melted at 0°C if 5200 joules of heat were added?
Answer:
0.02kg
Explanation:
Given parameters:
Amount of heat = 5200J
Unknown:
Mass of ice that would be melted at 0°C = ?
Solution:
To solve this problem, use the expression below;
H = mL
H is the heat
m is the mass
L is the latent heat of fusion of ice = 3.33 x 10⁵ J/kg.
Insert the parameters and solve for m;
5200 = m x 3.3 x 10⁵
m = [tex]\frac{5200}{3.33 x 10^{5} }[/tex] = 0.02kg
Does it matter which of the two sp3sp3 hybrid orbitals are used to hold the two nonbonding electron pairs
Answer:
No. All four hybrids are equivalent and the angles between them are all the same, so we can use any of the two to hold the nonbonding pairs.
Explanation:
Orbital hybridization has been the combination of the atomic orbitals for the formation of a new hybrid. No, it does not matter which orbitals are used to hold the nonbonding electron pairs.
What are hybrid orbitals?Hybrid orbitals are said to be formed by the mixing of the atomic orbitals with different energy and geometrical shape that allows the understanding of the atomic bonding and molecular geometry of the compounds.
It includes sp, sp², sp³, sp³d, and sp³d² which have various arrangements, including linear, trigonal planar, tetrahedral, trigonal bipyramidal, and octahedral. The hybrid orbitals are formed by the combination and overlapping of the s and p orbital.
It does not matter which sp³ orbital holds the two non-bonding electron pairs as all four hybrids have been known to have equivalent angles between them so it will not matter which hybrid has the non-bonded electrons in them.
Therefore, it will not matter which two sp³ hybrid holds the electron pairs that are not involved in bonding.
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Plzz helppppppppppppp
Answer:
i got you stop doing work and forget about this one class you will still pass trust me i did it it 8th grade and still made it to 9th but today im not even in school so just do better in your other classes
Explanation:
What term describes the state of matter in which the attractive forces between particles are the greatest?
liquid
solid
gas
metal
Answer:
I think it would be b
Explanation:
7. A gas takes up a volume of 15 liters, has a pressure of 3.3 atm, and a temperature of 299 K. If I raise the
temperature to 350 K and lower the pressure to 1050 mmHg, what is the new volume of the gas?
8. I have an unknown volume of gas held at a temperature of 115 K in a container with a pressure of 60.0
atm. If by increasing the temperature to 225 K and decreasing the pressure to 30.0 atm causes the volume
of the gas to be 25 liters, how many liters of gas did I start with?
9. A gas has a temperature of 14oC, and a volume of 5.5 liters. If the temperature is raised to 29oC and the
pressure is not changed, what is the new volume of the gas?
10. A gas that has a volume of 28 liters, a temperature of 65oC, and an unknown pressure has its volume
increased to 36 liters and its temperature decreased to 35oC. If I measure the pressure after the change to
be 2.0 atm, what was the original pressure of the gas?
Answer:
See explanation
Explanation:
7) P1 =3.3 atm
V1= 15 litres
T1 = 299 K
T2 = 350 K
P2 = 1050 mmHg/760 = 1.38 atm
V2?
From;
P1V1/T1 = P2V2/T2
P1V1T2 = P2V2T1
V2 = P1V1T2/P2T1
V2 = 3.3 * 15 * 350/1.38 * 299
V2 = 17325/412.62
V2 = 42 litres
8) V1= unknown
T1= 115 K
P1 = 60 atm
T2= 225 K
P2 = 30 atm
V2 = 25 litres
From;
P1V1/T1 = P2V2/T2
P1V1T2 = P2V2T1
V1 = P2V2T1/P1T2
V1 = 30 * 25 * 115/ 60 * 225
V1 = 86250/13500
V1 = 6.4 litres
9) T1 = 14 + 273 = 287 K
V1 = 5.5 liters
T2 = 29 + 273 = 302 K
V2 = the unknown
From Charles law;
V1/T1 = V2/T2
V1T2 = V2T1
V2 =V1T2/T1
V2 = 5.5 * 302/ 287
V2 = 5.8 litres
10) V1= 28 litres
T1= 65 + 273 = 338 K
P1 = the unknown
V2 = 36 liters
T2 = 35 + 273 = 308 K
P2 = 2 atm
P1V1/T1 = P2V2/T2
P1V1T2 = P2V2T1
P1 = P2V2T1/V1T2
P1 = 2 * 36 * 338/ 28 * 308
P1 = 24336/8624
P1 = 2.82 atm
Which metal absorbs the greatest amount of heat energy
Answer:
This question is incomplete but the completed question is in the attachment below. And the correct is b
Explanation:
Specific heat capacity can be defined as the amount of heat required to raise to raise 1 kg of a substance by 1 kelvin. Thus, this means that when the specific heat capacity of a substance is high, it takes more energy to increase the temperature of that substance. This also means that when different substances are subjected to the same amount of heat, the substance with the higher specific heat capacity will absorb less heat; for example at a beach, water has a very high specific heat capacity, thus when the sand in the beach is hot, the beach water is still relatively cold.
From the description above, it can be seen that the metal with the least specific capacity will absorb the greatest amount of heat, thus the metal is lead with the specific heat capacity of 0.129 J/(g. °C).
Xavier boiled 19 grams of water. If all of the water changed into a gas, what would be the mass of the steam?
Answer:
19g
Explanation:
The mass of the steam produced in this phase change process will also be 19g. This is in compliance with the law of conservation of mass.
It states that "mass is neither created nor destroyed in a the cause of reaction". The law suggests that mass is conserved. When steam is heated, it does not lose its mass. The mass of the steam is still the same as that of water.Answer:
Xavier boiled 14 grams of water. If all of the water changed into a gas, what would be the mass of the steam?
A.
28 g
B.
0 g
C.
24 g
D.
14g
Explanation:
Which statement describes effusion?
It occurs when a gas passes through a tiny hole.
It occurs when a liquid passes through a tiny hole.
It occurs when gas molecules disperse throughout a container.
It occurs when a liquid disperses throughout a container.
Answer:
A. It occurs when a gas passes through a tiny hole.
Explanation:
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Urgent!! SOMEONE PLEASE HELP THANK YOU!
A gas occupies a volume of 555 mL at 0 °C and 8 0.0 kPa. What is the final celsius temperature when the volume of the gas is changed to 1880 mL and the pressure is changed to 39 kPa?
Answer:
The final temperature is 181.92°C
Explanation:
Given
Initial Temperature, T1 = 0°C
Initial Volume, V1 = 555mL
Initial Pressure, P1 = 80.0kPa
Final Volume, V2 = 1880ml
Final Pressure, P2 = 39kPa
Required
Determine the Final Temperature, T1
This question illustrates ideal gas law and will be solved using:
(P1 * V1)/T1 = (P2 * V2)/T2
But first, we need to convert temperature to degree Kelvin
T1 = 0°C = 273 + 0 = 273k
Next, we substitute values for P1, V1, T1, P2 and V2
THE EQUATION BEFOMES
(80 * 550)/273 = (1880 * 39)/T2
44000/273 = 73320/T2
Cross Multiply
44000 * T2 = 73320 * 273
44000T2 = 20016360
Solve for T2
T2 = 20016360/44000
T2 = 454.92K
Convert to degree Celsius
T2 = 454.92 - 273
T2 = 181.92°C
Hence, the final temperature is 181.92°C
The ideal gas law, also called the general gas equation, is the equation of the state of a hypothetical ideal gas.
The ideal gas law work under the constant:-
PressureTemperatureVolumeHence the formula we gonna use is as follows:-
[tex]PV = nRT[/tex]
In the question, the pressure, temperature, and volume are given in two different system
Hence it is equal to
[tex]\frac{PV}{T} = \frac{PV}{T}[/tex]
Put the value given,
[tex]\frac{80*50}{273} = \frac{1880*39}{T}[/tex]
Solving the equation, the value T will be:-
[tex]T2 = \frac{20016360}{44000}[/tex]
=181.92C
The temperature given is 181.92C
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