Answer:
41.3 °C
Explanation:
From the question given above, the following data were obtained:
Mass (M) of water = 27.56 g
Heat (Q) loss = 2443 J
Final temperature (T2) = 62.5 °C
Initial temperature (T1) =?
NOTE: The specific heat capacity (C) of water is 4.18 J/g°C
Thus, we can obtain the initial temperature of the water by using the following formula:
Q = MC(T2 – T1)
2443 = 27.56 × 4.18 (62.5 – T1)
2443 = 115.2008 (62.5 – T1)
Divide both side by 115.2008
2443 / 115.2008 = (62.5 – T1)
21.20645 = 62.5 – T1
Collect like terms
21.20645 – 62.5 = – T1
– 41.3 = – T1
Divide both side by – 1
– 41.3 /– 1= – T1 / –1
41.3 = T1
T1 = 41.3 °C
Thus, the initial temperature of the water was 41.3 °C
PLEASE HELP ME, CHEMISTRY THANKS! :)
The density of water at 4.00°C is 0.967 g/mL. How many molecules of water are present in a 499.8 mL bottle of water? Express your answer to the correct number of significant figures. Be sure to show all steps completed to arrive at the answer.
Answer:
161.69×10²³ molecules
Explanation:
Given data:
Volume of water = 499.8 mL
Density of water = 0.967 g/mL
Number of molecules of water = ?
Solution:
First of all we will calculate the mass of water.
Density = mass/volume
0.967 g/mL = mass/499.8 mL
Mass = 0.967 g/mL × 499.8 mL
Mass = 483.3 g
Number of moles of water:
Number of moles = mass/molar mass
Number of moles = 483.30 g / 18 g/mol
Number of moles = 26.85 mol
1 mole contain 6.022×10²³ molecules
26.85 mol ×6.022×10²³ molecules / 1mol
161.69×10²³ molecules
Answer:
density of water at 4.00c is 0.967 g/mL. Volume of water=499.8mL
Mass of water=density x volume= 0.967 x 499.8=483.3066g
Number of moles of water molecules in given of water = givenmass/molarmass=483.3066/18=26.85
we know that 1 mole has 6.022 x 1023 molecules of water
so the number of water=6.022 x 1023 x 26.85=161.69 x 1023 =1.62 x 1025 molecules of water is its upto 3 significant figure.
Explanation:
what is the name of this molecule?
a. Ethanal
b. Ethylamine
c. Ethanoic acid
d. Ethanol
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the correct option is option B that is Ethylamine.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond. The name of given molecule is Ethylamine. The functional group that is present in the given molecule is ammine.
Therefore, the correct option is option B that is Ethylamine.
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ATP, the energy used inside a cell, is created in the Ribosomes
?true or false?
Answer:
false
Explanation:
because its made in the mitochondria
Compared to compounds with network structures, compounds arranged in molecules (covalent bonds) have ____________ melting points.
Explanation:
.... have lower melting points.
Which statement best describes what happens to the energy of the particles when water vapor begins to cool?
A. The average potential energy decreases.
B. The average kinetic energy decreases.
C. The average potential energy remains the same.
D. The average kinetic energy remains the same.
Average kinetic energy is the average sum of all kinetic energy of all the molecules of gases. Therefore, the correct option is option B that is average kinetic energy decreases.
What is kinetic energy?It is a energy which is possess by a moving object. It is very difficult to find the correct value of kinetic energy so we find average kinetic energy. Which is very easy to calculate as compared to calculating kinetic energy. It is not dependent on the type of gases or mass of gases.
Mathematically,
K.E=1/2mv²
Where,
m= mass of particles
v= velocity of particles
Water vapor condenses when it cools. Water undergoes a phase shift, transitioning from the gas to a liquid. Evaporation is the inverse of condensation. When water vapor begins to cool, average kinetic energy decreases.
Therefore, the correct option is option B.
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ILL GIVE BRAINLIEST I NEED THE ANSWER RIGHT AWAY PLEASE SOMEONE
For each of the following processes that show the formation of ions, complete the process by indicating
the number of electrons that must be gained or lost
to form the ion. Indicate the total number of electrons in the ion, and in the atom from which it was
made.
a. Al S Al3 d. F S F
b. S S S2 e. Zn S Zn2
c. Cu S Cu f. P S P3
77. For each of the following atomic
Answer:
ILL GIVE BRAINLIEST I NEED THE ANSWER RIGHT AWAY PLEASE SOMEONE
For each of the following processes that show the formation of ions, complete the process by indicating
the number of electrons that must be gained or lost
to form the ion. Indicate the total number of electrons in the ion, and in the atom from which it was
made.
a. Al S Al3 d. F S F
b. S S S2 e. Zn S Zn2
c. Cu S Cu f. P S P3
77. For each of the following atomic
Explanation:
ILL GIVE BRAINLIEST I NEED THE ANSWER RIGHT AWAY PLEASE SOMEONE
For each of the following processes that show the formation of ions, complete the process by indicating
the number of electrons that must be gained or lost
to form the ion. Indicate the total number of electrons in the ion, and in the atom from which it was
made.
a. Al S Al3 d. F S F
b. S S S2 e. Zn S Zn2
c. Cu S Cu f. P S P3
77. For each of the following atomic
Study the Lewis dot diagram for nitrogen. Explain what is correct and what is incorrect about the diagram. Use details to support your answer.
Answer:
The Lewis dot diagram is supposed to have dots on each side. What's incorrect is that there isn't a dot on the bottom, only the left and right side and the top. What's correct about this is that there are 5 outer valence electrons, and they correctly put 5 dots, even though they're in the wrong place.
Explanation:
The given Lewis dot diagram of nitrogen is correct for the number of valence electrons for nitrogen. However, they are not correctly placed because two of them are lone pairs and only these two are shown as paired. Remaining three electrons have to be represented as single electrons.
What is Lewis dot structure?Lewis dot structure of an element represent its valence electrons shown as dots around the atom. The lone pair of electrons are shown as paired dots and other electrons as single dots.
For compounds, a Lewis diagram shows the bonded and non bonded electrons between bonded atoms. Nitrogen is 7th element and it contains 7 electrons in which 5 are valence electrons.
Nitrogen contains one lone pair of electrons. They have to be shown as paired dots in the Lewis structure. In the given diagram there are two pairs of electrons which is incorrect. Three electrons have to be shown as single dots.
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What is responsible for the blue sky?
Answer:
well for me it's
Explanation:
The reflection of the seas
Using the data below, calculate the enthalpy for the combustion of C to CO C(s) + O2(g)--> CO2 (g) ΔH1 = -393.5 kJ CO(g) + 1/2O2(g) -->CO2(g) ΔH2= -283.0kJ Target: C(s) + 1/2O2(g) --> CO(g) ΔH3=?? Group of answer choices
Answer:
ΔH = -110.5kJ
Explanation:
It is possible to obtain enthalpy of combustion of a particular reaction by the algebraic sum of similar reactions (Hess's law). Using:
1. C(s) + O₂(g) → CO₂(g) ΔH₁ = -393.5kJ
2. CO(g) + 1/2O₂(g) → CO₂(g) ΔH₂ = -283.0kJ
The sum of 1 -2 gives:
C(s) + O₂(g) + CO₂(g) → CO₂(g) + CO(g) + 1/2O₂(g)
C(s) + 1/2O₂(g) → CO(g) ΔH = -393.5kJ - (-283.0kJ) =
ΔH = -110.5kJyou’re beautiful *heart*
A template of a Venn diagram representing common and differentiating characteristics of covalent and ionic bonds is shown.
Which of the following characteristics can be written only in space B?
Occurs in substances that have at least one non-metal
Occurs in substances that have a repeating lattice structure
Occurs in substances that have discrete molecular structure
Occurs in substances that have high melting points
Ionic and covalent bonds can occur in substances that have a repeating lattice structure.
Ionic and covalent bondsIonic bonds are formed when an atom donates electron (s) to another atom. Covalent bonds, on the other hand, are formed when two atoms share electrons to complete their octet states.
Ionic compounds are formed from a combination of metal and non-metal atoms. They usually have crystalline lattice structures with high melting points.
Covalent compounds are formed between non-metal atoms. They can also have lattice structures but generally have lower melting points because the forces holding the molecules together are weaker.
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Answer:
Occurs in substances that have a repeating lattice structure
Explanation:
0.500 L of a gas is collected at 2911 MM and 0°C. What will the volume be at STP?
Answer:
V₂ = 1.92 L
Explanation:
Given data:
Initial volume = 0.500 L
Initial pressure =2911 mmHg (2911/760 = 3.83 atm)
Initial temperature = 0 °C (0 +273 = 273 K)
Final temperature = 273 K
Final volume = ?
Final pressure = 1 atm
Solution:
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
by putting values,
V₂ = P₁V₁ T₂/ T₁ P₂
V₂ = 3.83 atm × 0.500 L × 273 K / 273 K × 1 atm
V₂ = 522.795 atm .L. K / 273 K.atm
V₂ = 1.92 L
The pressure on a 200-milliliter sample of CO2(g) at constant temperature is increased from 60 kPa to 120 kPa. What is the new volume of the gas?
Answer:
100 milliliter
Explanation:
Initial Pressure P1 = 60 kPa
Final Pressure P2 = 120 kPa
Initial Volume V1 = 200mL
Final Volume V2 = ?
These parameters are related by the following boyle's law which is mathematically given as;
V1P1 = V2P2
Making V2 subject of interest;
V2 = V1P1 / P2
inserting the values;
V2 = 200 * 60 / 120
V2 = 100ml
In the ground state, all of the atoms of Period 3 elements have the same
Answer:
Shell number
Explanation:
8. When using the scientific notation system to express large numbers, move the_______
until____ digit(s) remain(s) to the left, then indicate the number of moves of the decimal point as the_______
9. When a measurement is recorded, it includes the_____
are certain plus one uncertain digit.
a. Major figures
b. Significant figures
c. Relative figures
d. Relevant figures
10.The ______is based on the lowest theoretical temperature, called______
a Kelvin scale, absolute zero
b. Celsius scale, absolute zero
c. Kelvin scale, boiling point of water
d. Centigrade scale, freezing point of water
Answer:
8. When using the scientific notation system to express large numbers, move the decimal until one digit(s) remain(s) to the left, then indicate the number of moves of the decimal point as the power of 10.
9. b. Significant figures.
When significant figures are used, the digits are certain plus one uncertain digit.
10. a Kelvin scale, absolute zero.
The Kelvin scale runs to absolute zero which is the lowest theoretical temperature. This measures 0 Kelvins on the Kelvin scale and −273.15°C on the Celsius scale.
How do Ionic bods form in binary compounds?
Answer:
Ionic bonding is the complete transfer of valence electron(s) between atoms and is a type of chemical bond that generates two oppositely charged ions. By losing those electrons, these metals can achieve noble-gas configuration and satisfy the octet rule. ...
Explanation:
HELP ASAP!!! Which two energy transformations are shown in the photo? A. Chemical energy → electromagnetic energy B. Chemical energy → thermal energy C. Thermal energy → electrical energy D. Thermal energy → chemical energy
Answer:
Chemical energy _ thermal energy
The energy required to overcome the attraction between two bonded nuclei and their shared electrons is called _____ energy. This quantity is a measure of bond strength since the stronger the bond, the _____ the amount of energy required to break it.
Answer:
Nuclear Binding Energy (Bond Energy), Higher (Greater)
Explanation:
The energy required to overcome the attraction between two bonded nuclei and their shared electrons is called Nuclear Binding Energy (Bond Energy). This quantity is a measure of bond strength since the stronger the bond, the Higher (Greater) the amount of energy required to break it.
The energy required to overcome the attraction between two bonded nuclei and their shared electrons is called bond energy. This quantity is a measure of bond strength since the stronger the bond, the greater amount of energy required to break it.
I hope this helps!
What is causing the Hot Springs to be so hot? What is causing Hot Springs to be so acidic?
Answer:
Hot springs are hot because of geothermal heat. The Hot springs are acidic because hydrogen sulfide and carbon dioxide get in touch with water they evaporate which causes acid.
Explanation:
How many grams is 1.700 moles of KCl?
Answer:126.73720999999999
Explanation:
Answer:
126.7 grams/mole of KCl
Explain how the complexity and diversity of living things has changed over time.
Answer:A complex biological structure with many interacting parts might appear, at first glance, as if it were originally created in its present form with all its interlocking components fully formed and intact. It doesn’t seem possible that they developed step by step via biological evolution. In Darwin’s Black Box, Michael Behe introduces a term that he and other proponents of Intelligent Design use for this concept: irreducible complexity. No part of an irreducibly complex system has any apparent function except in its relation to the other parts.
An atom with 5 protons, 6 neutrons, and 5 electrons has an atomic mass of __amu. (Enter a whole number.
Numerical Answers Expected!
Answer for Blank 1:
Answer:
3
Explanation:
Please help im tryna finish school
Answer:
A. Wave Height
Explanation:
Match each item with the correct statement below.
a.
Intramolecular force
d.
Intermolecular forces
b.
tetrahedral
e.
London dispersion Forces (LDFs)
c.
linear
____ 1. An intermolecular force that occurs between two molecules of Br2 is formed by?____
____ 2. Is a force that occurs within molecules and compounds.
____ 3. Dipole – dipole, Hydrogen Bond, and London dispersion Forces are examples of what type of force?
____ 4. Is the molecular shape of HI.
__ 5. the molecular shape of CH4
1. LDFs
2. Intermolecular Forces
3. Intramolecular Forces
4. Linear
5. Tetrahedral
Edit: I'm new to this site and idk how to use it properly. I'm not sure about 2 and 3 currently because these forces are between molecules as well so INTERmolecular would be used twice (?)
how can I identify easliy Amphoteric oxide from basic oxide
Answer:
A general guideline to determine if oxide is acidic, basic, or amphoteric is to use the periodic table. Typically, metals such as Ba form basic oxides (BaO), while nonmetals such as S form acidic oxides (SO3).
What is potential energy?
Answer:
the energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors.
Explanation:
In physics, potential energy is the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors.
140 g of apple contains about
80 Calories (C) of energy. How many
grams of apples would you need to eat
to consume 360 Calories?
How many grams of apple would you need to eat and consume 360 calories
Answer:
630 grams
Explanation:
140/80 = 1.75
360 times 1.75 = 630
What will the subscript for NH4 be?
Answer:
2
Explanation:
The subscript on Ammoniumwhich is (NH4) is 2.
Hope this helped!
Ag, CO,
Find out the stock system thank you
Answer:
a system in chemical nomenclature and notation of indicating the oxidation state of the significant element in a compound or ion by means of a Roman numeral that is used in parentheses after the name or part of the name designating this element and ending invariably in -ate in the case of an anion and that is placed. Stock nomenclature for inorganic compounds is a widely used system of chemical nomenclature developed by the German chemist Alfred Stock and first published in 1919. In the "Stock system", the oxidation states of some or all of the elements in a compound are indicated in parentheses by Roman numerals.
Explanation:
Brainliest please?
How many atoms are in a sample containing 7 moles of phosphorus?
1. d.4.125 x 10²⁴ atoms
2. c. 487.73 g
Further explanationThe mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
1. 7 moles of phosphorus, so n=7, then number of atoms :
[tex]\tt N=7\times 6.02\times 10^{23}\\\\N=4.215\times 10^{24}[/tex]
2. 2.5 moles of Pt, so n=2.5, the mass of Pt(MW=195,084 g/mol) :
[tex]\tt mass=mol\times MW\\\\mass=2.5\times 195,084\\\\mass=487.73~g[/tex]