Answer:
c = 0.898 J/g.°C
Explanation:
1) Given data:
Mass of water = 23.0 g
Initial temperature = 25.4°C
Final temperature = 42.8° C
Heat absorbed = ?
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
Specific heat capacity of water is 4.18 J/g°C
ΔT = 42.8°C - 25.4°C
ΔT = 17.4°C
Q = 23.0 g × × 4.18 J/g°C × 17.4°C
Q = 1672.84 j
2) Given data:
Mass of metal = 120.7 g
Initial temperature = 90.5°C
Final temperature = 25.7 ° C
Heat released = 7020 J
Specific heat capacity of metal = ?
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 25.7°C - 90.5°C
ΔT = -64.8°C
7020 J = 120.7 g × c × -64.8°C
7020 J = -7821.36 g.°C × c
c = 7020 J / -7821.36 g.°C
c = 0.898 J/g.°C
Negative sign shows heat is released.
____ 1. Which is responsible for removing waste? ____ ____ ____ ____ 2. 3. 4. 5. brain c. Kidneys heart d. Lungs Which body system is responsible for removing waste from your body? respiratory c. Excretory circulatory d. reproductive Which is not a kind of blood vessel? valve c. Capillary artery d. Vein Which body system is responsible for producing offspring? respiratory c.Excretory circulatory d. reproductive Which body system is responsible for bringing food and oxygen to every cell in your body? respiratory c. excretory circulatory d. reproductive ____ 6. Which body system is responsible for carrying oxygen and carbon dioxide in and out of your body? ____ 7. respiratory circulatory Which is not a part of the circulatory system? c. d. excretory reproductive a. blood c. blood vessels b. heart d. trachea
Answer:
[tex]1)kidneys \\ 2)excretory \\ \: \: 3)valve \\ \: 4)reproductive \\ \: 5)circulatory \\ \: 6)circulatory \\\ \: 7)trachea \\ \\ \\ plzz \: mark \: as \: brainliest[/tex]
Xg of U and 3.795 g of O combine to form 20.00 g of
U308 . What is the percent composition of uranium in U308 ?
a
15.18%
b 42.41%
C 81.03%
d None of the above
The percent composition of Uranium in U308 = C. 81.03%
Further explanationGiven
X g of U
3.795 g of O
20.00 g of U308
Required
The percent composition of Uranium
Solution
mass of Uranium in U308 :
= mass of U308 - mass of O
= 20 g - 3.795 g
= 16.205 g
The percent composition :
[tex]\tt \%U=\dfrac{mass~U}{mass~U308}\times 100\%[/tex]
%U = (mass U/mass U308) x 100%
%U= (16.205/20) x 100%
%U = 81.025≈81.03
define pH ?
do it fast , okay
Answer:
pH is a measure of how acidic/basic water is. The range goes from 0 to 14, with 7 being neutral.
what is one example of a electromagnetic wave
Answer:
Examples of EM waves are radio waves, microwaves, infrared waves, X-rays, gamma rays, etc.
Answer:
Electromagnetic waves can be split into a range of frequencies. This is known as the electromagnetic spectrum. Examples of EM waves are radio waves, microwaves, infrared waves, X-rays, gamma rays, etc.
Explanation:
A farmer has bred his pineapple plants from the sweetest pineapples from his last harvest to get even sweeter pineapple plants. What is this an example of?
Answer: Selective breeding?
Explanation:
A farmer has bred his pineapple plants from the sweetest pineapples from his last harvest to get even sweeter pineapple plants. This is an example of selective breeding.
What is selective breeding ?By determining which male and female animals or plants will normally reproduce sexually and generate offspring together, people can employ animal and plant breeding to selectively acquire specific phenotypic features.
But excessive selective breeding can result in the emergence of hereditary diseases. And in fact, many dog breeds today experience major health problems as a result of their excessive physical characteristics. Health issues known as genetic illnesses are brought on by "flaws" in a person's genome.
Through artificial selection, several fruits and vegetables have been enhanced or even created. Selective breeding was very useful in creating broccoli, cauliflower, and cabbage from the wild mustard plant.
Thus, This is an example of selective breeding.
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Question in Pic. Please Help. Brainliest!
Answer:
i think its a
Explanation:
_____ was Isaac Newton’s first contribution to the scientific community.
Principia
The infinite series
The reflecting telescope
The refracting telescope
Answer:
Principia
Explanation:
hurry please Which of the following is a compound?
CO2
Ne
O2
P4
Answer:
p4
Explanation:
8SnCl4
How many atoms
Answer:
i think i like 14 or 8 atom
Explanation:
2AlF3 + 3K2O → 6KF + Al2O3
How many grams of AlF3would it take to make 15.524 g of KF?
7.4797 g AlF₃
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Stoichiometry
Reading a Periodic TableExplanation:Step 1: Define
[RxN] 2AlF₃ + 3K₂O → 6KF + Al₂O₃
[Given] 15.524 g KF
Step 2: Identify Conversions
[RxN] 2 mol AlF₃ = 6 mol KF
Molar Mass of Al - 26.98 g/mol
Molar Mass of F - 19.00 g/mol
Molar Mass of K - 39.10 g/mol
Molar Mass of AlF₃ - 26.98 + 3(19.00) = 83.98 g/mol
Molar Mass of KF - 39.10 + 19.00 = 58.10 g/mol
Step 3: Stoichiometry
Set up: [tex]\displaystyle 15.524 \ g \ KF(\frac{1 \ mol \ KF}{58.10 \ g \ KF})(\frac{2 \ mol \ AlF_3}{6 \ mol \ KF})(\frac{83.98 \ g \ AlF_3}{1 \ mol \ AlF_3})[/tex]Multiply/Divide: [tex]\displaystyle 7.47966 \ g \ AlF_3[/tex]Step 4: Check
Follow sig fig rules and round. We are given 5 sig figs.
7.47966 g AlF₃ ≈ 7.4797 g AlF₃
Answer:
7.4798
Explanation:
i just did the quiz, the guy above me is wrong.
What is a disadvantage of geothermal energy
Answer:
it runs the risk of triggering earthquakes. releases harmful gases
The symbol for iron is Fe. The chemical symbol for oxygen is O. The formula for iron oxide, a type of rust is Fe2O3. How many iron atoms are in one molecule of iron oxide? A. 1
B. 2
C. 3
D. 4
The empirical formula denotes the exact number of atoms of each
element present in a compound.
Answer:
False, the empirical formula denotes the smallest whole-number ratio of atoms in a compound
Explanation:
a molecular formula is the total number of atoms in the compound
Which of the following characteristics is NOT used to classify organisms into groups?
a.
nucleus or no nucleus
c.
color or no color
b.
autotroph or heterotroph
d.
unicellular or multicellular
Answer:
b
Explanation:
.25 g of each of the following gasses are taken at 27°C and 600 mm
Hg pressure. Which of these will have the least volume?
(Molar mass (g/mole): HCI = 36.5, HBr = 81, HI = 128, HF = 20)
(R=0.082 Latm/K.mole)
A. HC1
B. HBr
C. HI
D. HF
HI has the least volume
Further explanationGiven
Gasses and molar mass
Required
The least volume
Solution
Ideal gas law
PV=nRT
V = (nRT)/P
n = mass : MW(Molar weight=molar mass)
[tex]\tt V=\dfrac{\dfrac{mass}{MW}RT }{P}\\\\V=\dfrac{mass.RT}{MW.P}[/tex]
so V is inversely proportional to MW(molar mass)
Because the values of P, R, T, and mass are the same, what matters is the value of the molar mass of each compound. The larger the molar mass the smaller the volume
From the available molar mass data, HI has the largest molar mass, so HI has the smallest volume
HELP PLEASE!!!
How are both stability and change seen in properties of elements?
Answer:
In both natural and built systems, stability and change are an important focus of study for both scientists and engineers. Stability refers to a system that is unchanging. ... A dynamic equilibrium exists when chemical reactions or physical movements occur at rates that balance out, creating no net change in a system.
Answer:
In both natural and built systems, stability and change are an important focus of study for both scientists and engineers. Stability refers to a system that is unchanging. ... A dynamic equilibrium exists when chemical reactions or physical movements occur at rates that balance out, creating no net change in a system.
Explanation:
What does the cell nucleus contain~
A. Chromosomes
B. Cytoplasm
C. Vacuoles
D. Chloroplasts
Please answer correctly :3
Answer:
A. Chromosome
Explanation:
Chromosomes carry the genetic info, and the nucleus stores it.
Hope this helps :D
Calculate the empirical formula of each of the following substances with the following compositions.
a 3.60 g of magnesium and 10.65 g of chlorine
b 9.1 g of lithium and 10.4 g of oxygen
The empirical formula :
MgCl₂
Li₂O
Further explanationGiven
a 3.60 g of magnesium and 10.65 g of chlorine
b 9.1 g of lithium and 10.4 g of oxygen
Required
The empirical formula
Solution
The empirical formula is the smallest comparison of atoms of compound forming elements.
A molecular formula is a formula that shows the number of atomic elements that make up a compound.
(empirical formula) n = molecular formula
a. mol ratio of Mg (Ar=24 g/mol) and Cl(Ar=35.5 g/mol)
Mg : Cl
=3.6/24 : 10.65/35.5
=0.15 : 0.3 = divide by 0.15
=1 : 2
The empirical formula : MgCl₂
b. a. mol ratio of Li (Ar=7 g/mol) and O(Ar=16 g/mol)
Li : O
=9.1/7 : 10.4/16
=1.3 : 0.65 = divide by 0.65
= 2 : 1
The empirical formula : Li₂O
a car is running with the velocity of 12 kilometre per hour what will be its velocity after 5 seconds if its acceleration is 2 metre
The velocity after 5 second =19 m/s
Further explanationGiven
Initial velocity =vi = 12 km/h=3.3 m/s
Time=t = 5 s
Acceleration=a = 2 m/s²
Required
Final velocity, vf
Solution
Motion with constant acceleration
Can be formulated :
vf=vi+at
Input the value :
vf=3.3+2.5
vf=9+10
vf=19 m/s
The way molecules in a substance move around each other
Answer:
diffusion
Explanation:
is the movement of molecules from high concentration to low concentration.
How many grams are in 3.00 x 10^24 molecules of Zn(C2H3O2)2?
Answer:
Mass = 917.4 g
Explanation:
Given data:
Number of molecules = 3.00 ×10²⁴ molecules
Mass in gram = ?
Solution:
1 mole contain 6.022 × 10²³ molecules
3.00 ×10²⁴ molecules × 1 mol / 6.022 × 10²³ molecules
0.5×10¹ mol
5 mol
Mass in gram:
Mass = number of moles × molar mass
Mass = 5 mol × 183.48 g/mol
Mass = 917.4 g
___ is a measure of gravity's pull on an object.
Volume
Weight
Mass
Answer:mass
Explanation:
Answer:
weight is the measure of the force of gravity pulling on the object. mass is the measure of the object's matter.
Please help thank you!
Which of the following is the correct definition for a compound?
A substance that can be separated into two or more substances only by chemical means.
A substance that cannot be separated into more substances.
A substance that can be separated into two or more substances by chemical or physical means.
A substance that can be separated into two or more substances only by physical means.
Answer:
A: A substance that can be separated into two or more substances only by chemical means.
Explanation:
The best answer for this would be A. A compound in general is when two or more elements are bonded chemically. That is, the elements are joined in a chemical reaction. An example of a compound is table salt; (sodium chloride) NaCl. It, like all chemicals, can be separated into both of its components, so B is out. The other two answers basically say is it either only chemical or physical means that can separate it, when the answer is that it is only chemical changes that can separate a compound. There can be a reaction when a compound is broken up. You might think that you can separate salt crystals with a hammer or some physical force, but that's only the salt lattice, not the Na and Cl coming apart. Also, for the compound water, H2O, the Hydrogen and Oxygen can be separated by running an electric current through the water sample. This chemically alters the water molecule and splits it up, which is a chemical change. So, to sum up here, you can only use chemical means to separate a compound. Take care!
A compound is a substance that can be separated into two or more of its constituents by chemical methods. So the correct option is A.
What is a chemical compound?
Any material made up of similar molecules with atoms from two or more different chemical elements is referred to as a chemical compound.
Atoms from more than 100 distinct chemical elements, both in their pure forms and when mixed to create chemical compounds, make up all matter in the universe. A sample of a pure element has just the atoms that are distinctive of that element, and each element's atoms are distinct.
For instance, the atoms that make up carbon differ from those that make up iron, which differs from those that makeup gold. Every element has a distinct symbol that is made up of one, two, or three letters that come from either the element's current name or its original name.
Therefore the correct option is A.
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Calculate the heat evolved kJ for the reaction of
1.00 g of elemental sulfur.
Answer: Calculate the heat evolved (per mo SO2) for the reaction of sulfur with oxygen to form SO . Calculate the heat evolved from a reaction mixture of 13.4L SO at 1 ATM and 273K ... N-2 (g) + Os (g) → 2 NO (g) H = +180.6 kJ.
Explanation: I hoped that was helpful!
I neeeeeeeeed help you within 30 min
Answer:
The answers to your question are given below
Explanation:
The equation for the reaction is given below:
2KClO₃ —> 2KCl + 3O₂
The total number of each atoms present in the reactants and products can be obtained by doing a head count as illustrated below:
Reactants >>>>>> Number of atoms
Potassium (K) >>> 2 × 1 = 2
Chlorine (Cl) >>>> 2 × 1 = 2
Oxygen (O) >>>>> 2 × 3 = 6
Products >>>>>>> Number of atoms
Potassium (K) >>> 2 × 1 = 2
Chlorine (Cl) >>>> 2 × 1 = 2
Oxygen (O) >>>>> 3 × 2 = 6
CH4 + 202 → CO2 + 2H2O
How many moles of O2, needed to produce 36 grams of H20?
2.0 mol O₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableStoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[RxN - Balanced] CH₄ + 2O₂ → CO₂ + 2H₂O
[Given] 36 g H₂O
Step 2: Identify Conversions
[RxN] 2 mol H₂O → 2 mol O₂
Molar Mass of H - 1.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of H₂O - 18.02 g/mol
Step 3: Stoichiometry
Set up: [tex]\displaystyle 36 \ g \ H_2O(\frac{1 \ mol \ H_2O}{18.02 \ g \ H_2O})(\frac{2 \ mol \ O_2}{2 \ mol \ H_2O})[/tex]Divide/Multiply: [tex]\displaystyle 1.99778 \ mol \ O_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
1.99778 mol O₂ ≈ 2.0 mol O₂
a sample of methane gas at a pressure of 0.815 atm and a temperature of 265 C occupies a volume of 416 mL. If the gas is heated at constant pressure until its volume is 593 ml the temperature of the gas will be _________ C
Answer:
493.9°C
Explanation:
Given parameters:
Initial pressure =0.815atm
Initial temperature = 265C = 265 + 273 = 538k
Initial volume = 416mL = 0.416L
New volume = 593mL = 0.593L
Unknown:
New temperature =?
Solution:
Since we are dealing with constant pressure condition, we apply charles's law.
It states that the volume of a fixed mass of gas varies directly as its absolute temperature if the pressure is constant.
Mathematically ;
[tex]\frac{V1}{T1}[/tex] = [tex]\frac{V2}{T2}[/tex]
V1 is the initial volume V2 is the new volume
T1 is the initial temperature T2 is the new temperature
[tex]\frac{0.416}{538}[/tex] = [tex]\frac{0.593}{T2}[/tex]
T2 = 766.9K;
In °C = 766.9 - 273 = 493.9°C
Which section of the ocean floor is near the coastline of all continents?
Answer shallow ocean
Explanation:
i think
In a couplet one statement is _____ and one is ______
A. Agreeing and rejecting
B. Deciding and Acting
C. Informing and Agreeing
Answer: a
Explanation:
In a couplet one statement is agreeing and one is rejecting. Therefore, option A is correct.
What do you mean by couplet ?A couplet is two lines of poetry that follow each other, particularly two lines that rhyme and are the same length.
Heroic couplets are similar to elegiac couplets. Heroic couplets are also usually closed and have their own meaning. They are frequently used in English epics and narrative poems.
A couplet is a unit of two lines of poetry that use the same or similar meter, rhyme, or are separated from other lines by a double line break. Here are some more important facts about Couplets are not required to be separate stanzas.
Thus, option A is correct.
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A 10.0 g sample of a hydrate was heated until all the water was driven off. The mass of the anhydrous product remaining was 8.00 grams. What is the percent of water in the hydrate?
Answer:
20%
Explanation:
10.0 = 100%
8.00 = 80%
100-80= 20