Answer:
heat lost by iron bar is 168.2 kJ
Explanation:
The heat gained by the water as a result of temperature rise is given by:
Q = mCΔT
ΔT = change in temperature = final temperature - initial temperature = 89°C - 22°C = 67°C
m = mass of water = 600 g
C = specific heat of water = 4.184 J/g-K
Q = heat gained
Substituting:
Q = 600 * 4.184 * 67
Q = 168.2 kJ
The heat gained by the water is 168.2 kJ
The heat lost by iron bar = heat gained by water
heat lost by iron bar = 168.2 kJ
9. When the vapor pressure of a liquid is equal to the
atmospheric pressure, the liquid will
A) freeze
B) boil
C) melt
D) condense
Select all properties that you included in your hypothesis. . . . High melting and boiling points and therefore solid at room temperature . . . A crystalline structure . . . Ability to dissolve easily in water . . . Ability to conduct electricity well
Answer:
High melting and boiling points and therefore solid at room temperature
A crystalline structure
Ability to dissolve easily in water
Ability to conduct electricity well
Explanation:
The hypothesis mentioned in the question will be something like this
'If a substance is solid at room temperature, has a crystalline structure, dissolves easily in water, and conducts electricity well, then it likely contains ionic bonds. Otherwise, it likely contains covalent bonds'
We can see that all the items selected in the answer box were included in the hypothesis.
Answer:
C, B, D
good luck on your Chem!
comment if you have any questions!
how do calcium and fluorine become stable when they form calcium fluoride?
Answer:
Explanation:
It occurs as the mineral fluorite (also called fluorspar), which is often deeply coloured owing to impurities. ... Calcium reacts with fluorine to form the compound CaF2. ... (lead is very close) as hydrogen the bond would be considered ionic! ... What is the most stable monatomic ion formed from nitrogen?
Answer:
CaF2 is stable when it is formed because Ca loses two of its electrons. Both accept one electron each. now the Calcium is satisfied because it lost its two electrons and is now behaving like a noble gas, which is what they all want to be like The Flourine is satisfied because they both gained one electron, allowing them to have 8 valence electrons also like a noble gas.
The key is in the 8 valence electrons! Ca has to lose two to have 8, and F has to gain one to have 8fluorinefluorines...
Explanation:
What is the density of water (H20) at 4°C, which is just above the freezing point?
Answer:
1.0 g/cm3
Explanation:
Water behaves anomalously since it contracts when cooled from any temperature until 4°C and begins to expand below this temperature. Thus water expands when cooled between 4°C to 0°C.
It then follows that water has its maximum density at 4°C. The maximum density of water is 1.0 g/cm3. This is the density of water at 4°C.
which statement describes a benefit for fission reactions
Answer:
without fission reactions you wouldn't react, and we need to react
Explanation:
Sleet forms from which type of precipitation?
snowflakes
ice crystals
rain droplets
snow
Answer:
Explanation:
Sleet and freezing rain occur under very similar conditions. Sleet is pellets of ice that form when snow falls into a warm layer and melts into rain. The rain then falls into a freezing layer of air that is deep enough to refreeze the raindrops into pellets.
Why do you think the temperature does not change much during a phase change?
Answer: Temperature of a substance does not change during a phase change. Energy gained after the the solid melts increases the average kinetic energy or the temperature. Freezing. When liquid is freezing the energy flows out the the liquid.
Explanation:
Atoms are comprised of subatomic particles. Which of the following is a subatomic particle NOT found in the nucleus of an atom? O The core O Protons O Electrons 0 Neutrons
Answer:
O The core
Explanation:
Subatomic particles include electrons, the negatively charged, almost massless particles that nevertheless account for most of the size of the atom, and they include the heavier building blocks of the small but very dense nucleus of the atom, the positively charged protons and the electrically neutral neutrons. Which therefore means that the core is NOT a subatomic particle.
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How many mL is in ethanol when it has a mass of 3.9 g and a density of .78g/mL?
Answer:
5mL
Explanation:
mass divided by density is equal to volume so
3.9/.78 = 5
why does this work?
grams cancel when you divide g/g/mL and you are left with just mL
What type of chemical reaction does this equation represent?
2 Al + 3 FeO --> Al2O3 + 3 Fe
single replacement
O synthesis
combustion
O double replacement
Answer:
Single Replacement
Explanation:
Synthesis Reactions:
A + B → AB
Combustion Reactions:
CₓHₐ + O₂ → CO₂ + H₂O
Double Replacement Reactions:
AB + CD → AD + CB
Single Replacement Reactions:
A + BC → AB + C
Given RxN: 2Al + 3FeO → Al₂O₃ + 3Fe
We are replacing one element, therefore it is a single replacement reactionWrite chemical equations from the given word equations: Magnesium + Oxygen à Magnesium Oxide Hydrogen + Oxygen à Water Methane + oxygen à Carbon dioxide + Water
Answer:
1. 2Mg + O2 —> 2MgO
2. 2H2 + O2 —> 2H2O
3. CH4 + 2O2 —> CO2 + 2H2O
Explanation:
1. Magnesium + Oxygen —> Magnesium Oxide
Mg + O2 —> MgO
There are 2 atoms of O on the left side and 1 atom on the right side. It can be balance by putting 2 in front of MgO as shown below:
Mg + O2 —> 2MgO
There are 2 atoms of Mg on the right side and 1 atom on the left side. It can be balance by putting 2 in front of Mg as shown below:
2Mg + O2 —> 2MgO
Now the equation is balanced.
2. Hydrogen + Oxygen —> Water
H2 + O2 —> H2O
There are 2 atoms of O on the left side and 1 atom on the right side. It can be balance by putting 2 in front of H2O as shown below:
H2 + O2 —> 2H2O
There are 2 atoms of H on the left side and a total of 4 atoms on the right side. It can be balance by putting 2 in front of H2 as shown below:
2H2 + O2 —> 2H2O
Now, the equation is balanced.
3. Methane + oxygen à Carbon dioxide + Water
CH4 + O2 —> CO2 + H2O
There are 4 atoms of H on the left side and 2 atoms on the right side. It can be balance by putting 2 in front of H2O as shown below:
CH4 + O2 —> CO2 + 2H2O
There are 2 atoms of O on the left side and a total of 4 atoms on the right side. It can be balance by putting 2 in front of O2 as shown below:
CH4 + 2O2 —> CO2 + 2H2O
Now, the equation is balanced.
dimension analysis of universal gravitation constant
omg im so dumb i cant answer this question omg sorry im 302918291802832908310 years old and i cant think propertly
Which of these accurately describes a chemical reaction?
A. Products and reactants combine to form new reactants
B. Products and reactants combine to form new substances
C. Products combine to make reactants
D. Recatants combine to form products
Answer:
D
Explanation:
its just right
Answer:Reactants combine to form Products. Hope this helped! ;)
Explanation:
A. What are the stable isotopes of carbon?
B. What are the stable isotopes of nitrogen?
ahhh help
Answer:
carbon-12 (12C) and carbon-13 (13C).
nitrogen-14 (14N) and nitrogen-15 (15N)
A student measures the length of a magnesium ribbon three times and records the data as: (a). 23.486 cm, (b). 23.491 cm, (c). 23.511 cm, The labeled value of the magnesium ribbon is 23.490 cm. Calculate the precent error for ALL the data recorded by the student. Which has the least percentage error? (Show all work or an explanation)
Explanation:
A student measures the length of a magnesium ribbon three times and records the data as: (a). 23.486 cm, (b). 23.491 cm, (c). 23.511 cm
The labeled value of the magnesium ribbon is 23.490 cm
We need to find the precent error for all the data recorded by the student.
[tex]\text{Percentage error} = \dfrac{|\text{calculated value-actual value}|}{\text{acutal value}}\times 100[/tex]
(a) When the calculated value = 23.486 cm
[tex]\text{Percentage error} = \dfrac{23.486 -23.490 }{23.490 }\times 100\\\\=0.017\%[/tex]
(b) When the calculated value = 23.491 cm
[tex]\text{Percentage error} = \dfrac{23.491 -23.490 }{23.490 }\times 100\\\\=0.0042\%[/tex]
(c) When the calculated value = 23.511 cm
[tex]\text{Percentage error} = \dfrac{23.511 -23.490 }{23.490 }\times 100\\\\=0.0893\%[/tex]
When the calculated value is 23.486 cm, it has least error of 0.017%.
The relationship between the Kelvin temperature and volume of a gas is linear until the temperature begins to approach 0 K. why?
Answer:
See explanation
Explanation:
We must remember that gases exhibit ideal gas behavior at ordinary temperature and pressure.
As the system approaches absolute zero gas laws begin to break down and the relationship linear between volume and temperature (Charles law is broken).
Recall that, at absolute zero, the volume of an ideal gas would be zero and all molecular motion stops due to the fall in temperature and kinetic energy of the molecules.
The reason for linear should be explained below.
Temperature:Since the system approaches absolute zero gas laws starts to break down and the relationship is linear between volume and temperature At absolute zero, the volume of an ideal gas should be zero and all molecular motion stops because to the fall in temperature and kinetic energy of the molecules.
Learn more about the temperature here: https://brainly.com/question/19258620
Click all the types of energy that is involved after a car fills with gasoline and drives down the road.
Question 1 options:
chemical
solar
mechanical
nuclear
Chemical and mechanical energy is involved after a car is filled with gasoline and driven down the road. So the correct options are A and C.
What are chemical and mechanical energy?
Chemical energy is the energy that is stored in the bonds of any chemical compound. The chemical energy can be released when a chemical reaction is occurring, most commonly in the form of heat. These kinds of reactions are called exothermic reactions.
The reactions that need an input of heat energy to proceed and that may store an amount of that energy as chemical energy in their newly synthesized bonds are called endothermic reactions.
For example, the chemical energy in food is converted into mechanical energy and heat energy in the body.
Mechanical energy is defined as the sum of kinetic energy and potential energy. Kinetic energy is the energy of motion and potential energy is the energy stored in a system because of the position of its parts.
In a system that has only gravitational forces, mechanical energy is constant. This is an otherwise idealized system. This means that this lacks dissipative forces like forces of friction and of air resistance.
Therefore the correct options are A and C.
Read more about chemical and mechanical energy, here
https://brainly.com/question/13552918
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How many moles are in 3.48 x 1023 molecules of H2SO4?
Answer:
0.578 mol H₂SO₄
Explanation:[tex]\frac{3.48 * 10^{23}H2SO4}{1}[/tex] ×[tex]\frac{1 mol H2SO4}{6.02214*10^{23}molecules H2SO4}[/tex] =0.5778 mol H₂SO₄ = 0.578mol H₂SO₄
According to the law of conservation of mass, how much zinc was PRODUCED by reacting Calcium and Zinc carbonate together?
Answer:
104g
Explanation:
Based on the law of conservation of mass, the quantity of zinc produced by reacting calcium and zinc carbonate would be 104g.
The law of conservation of mass states that "in a chemical system, the mass is always conserved as matter is neither created nor destroyed but changed from one form to another".
In short;
Mass of products = Mass of reactants
Mass of products = Mass of CaCO₃ + Mass of Zn
Mass of reactants = Mass of Ca + Mass of ZnCO₃
So;
152g + Mass of Zn = 64g + 192g
Mass of Zn = 64g + 192g - 152g
Mass of Zn = 104g
Answer:
104g
Explanation:
math + science = 104g
The molecules in straw are made up of carbon, hydrogen, and oxygen atoms. Gold is made of gold atoms. Describe why straw cannot be turned into gold. In your answer, be sure to include what you have learned about chemical reactions, atoms and molecules, and reactants and products. Be as thorough as you can as you put together everything you have learned.
Answer:
See explanation
Explanation:
First of all we must remember the statement of Dalton's atomic theory that atoms can neither be created nor destroyed. Clearly, chemical reactions involves rearrangement of atoms of reactant and product molecules.
Since straw contains carbon, hydrogen, and oxygen atoms, it is obvious that there are no gold atoms in it.
If there are no gold atoms in straw, then straw can not be converted into gold by any chemical process because that implies that gold atoms are being 'created' in violation of Dalton's theory.
How do diffusion and osmosis differ?
Thank you
Answer:
Osmosis is the movement of solvent particles across a semipermeable membrane from a dilute solution into a concentrated solution. ... Diffusion: Diffusion is the movement of particles from an area of higher concentration to lower concentration. The overall effect is to equalize concentration throughout the medium.
THESE ARE CONSIDERED AS THE MALE GAMETES.
Answer:
Nobody cares
Explanation:
Cause nobody cares hope this helps
HELP ME PLEASE
i appreciate it in advance :)
Answer:
C
Explanation:
The valence electrons should be the ones reacting
Answer:
Only electrons in the outermost shell can participate in chemical reactions!
Explanation:
Which series of words describes lengths of geologic time from shortest to longest?
era
period
eon
era
Answer:
eon,era, period
Explanation:
Answer:
period<era<eon
Explanation:
I took the test, sadly got a 70%.
Х
Why do scientists use the International System of Units (SI)?
Answer:
So they can communicate their results without confusion.
Explanation:
At 150°C, water is a:
solid
liquid
gas
Answer:
gas
Explanation:
it would evaporate
ques-1 Write true and false for the following :-
1)tearing of paper is a physical change
2) The presence of oxygen and water is necessary for rusting of iron
3) Copper is more reactive than iron
4) A physical change can we reserved.
5) In a chemical change ,no new substance is formed
Ques-2 Complete the analogies.
1) Acetic acid:vinegar:: ...........lime water.
2) Copper sulphate : blue vitriol:: ........green vitriol
3) Physical change: ........... :: chemical change:permanent
4) Oxide of iron: .............. : : oxide of magnesium :MgO
5) Saline water: salt water :: soda water:
This organelle allows materials to get into and out of the cell. What am I?
a. Cell Wall
b. Nucleus
c. Cell Membrane
s. Ribosomes
Which negative quality does Deborah exhibit?
Answer: Disdain
Explanation: Deborah believes that people of other nationalities are inferior to her. she treats them with disdain and does not miss an opportunity to abuse them.
If a shell can hold a maximum of 32 electrons, what is the value of n?
2
3
4
5
Answer:4
Explanation:
Answer:
c.4 Just took the test!!!
Explanation: