Answer:
In the middle of every atom is the nucleus. The nucleus contains two types of subatomic particles, protons and neutrons. The protons have a positive electrical charge and the neutrons have no electrical charge. D. No Charge
Explanation:
Answer:
C & D
Explanation:
Just took quiz and got it right! Hope this helps! <3
Using the following bond energies:
Bond Bond Energy (kJ/mol)
C ≡ C 839
C-H 413
O=O 495
C=O 799
O-H 467
Estimate the heat of combustion for one mole of acetylene
C2H2(g)+5/2O2(g)→2CO2(g)+H2O(g)
a. 1228 kJ
b. -1228 kJ
c. -447 kJ
d. +447 kJ
e. +365 kJ
Answer:
The answer is "Option b".
Explanation:
Given equation and value:
[tex]\Rightarrow C_2H_2 \ (g)+ \frac{5}{2}O_2 \ (g) \longrightarrow 2CO_2\ (g)+H_2O\ (g)[/tex]
[tex]\left\begin{array}{ccc}C \equiv C&839\\C-H &413\\O=O &495\\ C=O &799\\ O-H &467 \end{array}\right \\\\[/tex]
calculating equation value:
[tex]\Rightarrow 839 + 2(413) +\frac{5}{2} (495) \longrightarrow 2(2)799+2 \times 467 +E[/tex]
[tex]\Rightarrow 839 + 826 +1237.5 = 3196+934 +E\\\\\Rightarrow 2902.5 =4130 +E\\\\\Rightarrow 2902 = 4130 +E\\\\\Rightarrow 2902 - 4130 +E\\\\\Rightarrow E = -1228 \ KJ \\\\[/tex]
The heat(enthalpy) of combustion of acetylene = -1228 kJ
The heat of combustion refers to the amount of heat released when 1 mole of a substance is burned.
The chemical reaction is given in the equation;
[tex]\mathbf{C_2H_{2(g)} + \dfrac{5}{2}O_{2(g)} \to 2CO_{2(g)}+H_2O_{(g)}}[/tex]The bond energy of the reactant is:
[tex]\mathbf{=( 1 \times C \equiv C) + ( \dfrac{5}{2} O =O)+(2 \times (C-H))}[/tex]Following the bond energies given in the question, we have:
= ( 1 × 839) +(5/2 × 495) +(2 × 413)
= 2902.5 kJ
The bond energy of the product is:
[tex]\mathbf{4 \times C=O ) + (2 \times O-H)}[/tex]= (4× 799) +(2 × 467)
= (3196 + 934) kJ
= 4130 kJ
The heat(enthalpy) of combustion of acetylene = bond energy of reactant - bond energy of the product.
The heat(enthalpy) of combustion of acetylene = 2902.5 kJ - 4130 kJ
The heat(enthalpy) of combustion of acetylene = -1227.5 kJ
≅ -1228 kJ
Learn more about heat of combustion here:
https://brainly.com/question/25521766
Express in scientific notation:
780000
Answer:
7.8 x 10^5
Explanation:
So in scientific notation the number has to be less then 10 and greater then 1 so in this case it would be 7.8 and the number of 0 moved 10^x power would be the number which in this case it’s 5 times so 10^5. multiply the two numbers and that’s scientific notation.
the atomic number of an element is......
Answer:
the number of protons in the nucleus of an atom.
Explanation:
cause they are the same no matter what.
In a second atomic absorption experiment, a student prepared a blank solution and measured itsabsorbance, in absorbance units (AU), three times. The measured values were 0.0044 AU, 0.0079 AUand 0.0062 AU.
Required:
a. Calculate the mean of the blank.
b. Calculate the precision of the blank.
c. Calculate the accuracy of the measurement if the true value of the blank is 0.0030 AU.
Answer:
0.0062AU 0.00082.106.7% errorExplanation:
a.) Average or mean value of readings, [tex]x_{o}[/tex] = (0.0044 + 0.0079 + 0.0062) / 3
= [tex]\frac{0.0185}{3}[/tex] = 0.0062 AU
b.) The accuracy of the readings is determined by taking determining the standard deviation (SD) of the readings:
SD = ∑ [tex]\sqrt{x- x_{o}}[/tex]/n
[tex](0.0062 - 0.0044)^{2}[/tex] = 0.0000032
[tex](0.0062 - 0.0079)^{2}[/tex] = 0.00000289
[tex](0.0062 - 0.0062)^{2}[/tex] = 0
SD = [tex]\frac{\sqrt{0.0000032 + 0.00000289 + 0} }{3}[/tex] = 0.00082.
c.) The % accuracy is the distance between the average value and true value
= [tex]\frac{0.0062-0.0030}{0.0030} *100[/tex] = 106.7% error.
What is the chemical symbol for 1s^22s^22p^6
Answer:
The chemical symbol of given electronic configuration is Ne.
Explanation:
First of all we will calculate the total number of electron from this electronic configuration:
1s² 2s² 2p⁶ = 2+2+6 = 10
we know that the number of electron of an atom shows its atomic number. The total number of electron in given electronic configuration are 10.
Now from periodic table we got to know that neon has atomic number of 10.
Thus the given electronic configuration is of neon atom.
Neon is belongs to noble gas family.
All noble gases have complete octet.
These are inert gases.
Question 1 (1 point)
An)
is when someone forms a conclusion right after making an observation
Blank 1:
Question 2 (1 point)
is an educated guess
Blank 1:
Question 3 (1 point)
If I am doing an experiment over and over again of MY own investigation for accuracy then it's called
Blank 1:
Question 41 point)
If someone else is replicating an investigation then it is called
Blank 1:
Meeting in "
Question 51 point
Something I change in an experiment is called
Answer:
i need help on this too.
Explanation:
The mass of a 5 mL sample of ethanol is 15.2 grams, what is the density?
Work Shown:
density = mass/volume
d = (15.2 grams)/(5 mL)
d = (15.2/5) grams per mL
d = 3.04 grams per mL
This is the same as writing 3.04 g/mL
what is the affect of neutrons on atoms
Answer:
It's better to explain it.
Explanation:
Neutrons do not affect the electron configuration, but the sum of atomic number and the number of neutrons, or neutron number, is the mass of the nucleus. You know that neutrons are found in the nucleus of an atom. Under normal conditions, protons and neutrons stick together in the nucleus. During radioactive decay, they may be knocked out of there. Neutron numbers are able to change the mass of atoms, because they weigh about as much as a proton and electron together. if your asking What is the role of a neutron in an atom? then, Neutrons are very important in providing stability for an atom. Some atoms don't "need" neutrons - The hydrogen atom does not have any neutrons. However, as the atomic number ( # of protons ) increases, the number of neutrons increases as well.
Protons don't like each other. Naturally, 'positive charges repel', so it wouldn't be possible to have more than one proton in the nucleus. Here's where the neutron comes in.
Hope this helps. :)
C10H20 is an organic compound. Calculate its molar mass to 2 decimal spaces.
Answer:
140.3 g/mol
Explanation:
Step 1: Define
Molar Mass C - 12.01 g/mol
Molar Mass H - 1.01 g/mol
Step 2: Multiply values
10(Molar Mass C) + 20(Molar Mass H)
10(12.01 g/mol) + 20(1.01 g/mol)
120.1 g/mol + 20.2 g/mol
140.3 g/mol
When a runner participates in a marathon, they travel a distance of 26.2 miles. How many kilometers is
this?
Answer:
Around 42.2 Km
Explanation:
Please help my last question thank you if u did answer it
Answer:
I don't know sorry I hope you find what you're looking for
Answer:
I think the answer is G
Explanation:
Carbon atom has 6 electrons 6 protons and 6 neutrons.(electron =negetive) (proton=positive) (neutron=neutral)
You should know protons and neutrons are in nucleus of atom and electrons surround them.I think you understand.
“Zn” is a...
Chemicals Formula
Symbol
Name
Explanation:
Zn is a symbol
its name is zinc
which statement is an example of an observation a scientist would make to clarify a rock.
A, a rock is larger than other rock.
b. A rock was found in a stream.
c, A rock is formed from molten lava.
b. A rock cracks in half after a rainstorm.
Answer: A
Explanation: Geologists classify rocks by looking at their chemical and mineralogical composition then at the the size and shape of their component minerals then at any texture.
WOULD YOU CONSIDER WATER AND OZONE TO BE MOLECULES ?
Answer:
yes
Explanation:
Water contains molecular bonds and because it is made from more than one element and they are oxygen and hydrogen.
ozone would be considered a molecule because it has three oxygen atoms formed together and is 21% of the gases found on earth
A ballon has a volume of 5.6L at 25C and it is placed into liquid nitrogen at a temp of -78c. what is the volume of the ballon
Answer:
3.7L
Explanation:
Given parameters:
Initial volume = 5.6L
Initial temperature = 25°C = 273 + 25 = 298K
Final temperature = -78°C = 273 + (-78) = 195K
Unknown:
New volume of the balloon = ?
Solution:
We are going to assume that the pressure is constant and then we apply the charles's law;
"the volume of fixed mass of a gas varies directly as its absolute temperature if its pressure is constant"
mathematically;
[tex]\frac{V_{1} }{T_{1} }[/tex] = [tex]\frac{V_{2} }{T_{2} }[/tex]
Where V and T are temperature
1 and 2 are initial and final states
Insert the parameters and solve;
[tex]\frac{5.6}{298}[/tex] = [tex]\frac{V_{2} }{195}[/tex]
298V₂ = 1092
V₂ = 3.7L
Is coffee and water heterogeneous or homogeneous?
Answer:
coffee is a homogeneous mixture while water is a heterogeneous mixture
HELP NOW!!!!!! When you put water into a hot metal pan of equal mass, why does the pan cool down more than the water heats up?
Answer:
Because the specific heat of the metal is less than the specific heat of water.
Explanation:
Hello, happy to help you today!
In this case, we need to analyze a property called "specific heat" which accounts for how much energy is required to increase or decrease the temperature of 1 g of the substance by 1 °C.
In this case, since the specific heat of water is about 4.184 J/g°C and the specific heat of metals in general is greater than zero, of course, but less than one, we can infer that for the same amount of energy, when they are in contact, more grams of metal will be cooled down to those of water heated up, because the specific heat of the metal is less than the specific heat of water.
Best regards!.
Tell me whats wrong in this
1. Titanium is a transition metal and gallium is a transition metal.
2. Nitrogen is a nonmetal and oxygen is a nonmetal. Nitrogen is in group 5A (15), and oxygen is in group 6A (16).
3. Lithium is a main group metal and sodium is a main group metal. Lithium is in group 1A (1), and sodium is in group 1A (1).
4. Argon is a nonmetal and bromine is a nonmetal. Argon is in group 8A (18), and bromine is in group 7A (17).
5. Germanium is a metalloid and arsenic is a metalloid. Germanium is in group 4A (14), and arsenic is in group 5A (15).
Answer:
Gallium is NOT a transition metal.
Explanation:
1. Titanium is a Transition metal However Gallium is NOT. Gallium is a main group metal, It belongs to group 3 - Boron Group.
All the remaining statements are correct.
How much time is required for an object moving 4.5m/s to travel 65 m
Answer:
About 14.45 seconds
Explanation:
If a object is going 4.5m/s and its destination is 65m then you need to divide.
65÷4.5 = 14.444444
due to the constant 4 you need to round 14.444 so it would be 14.45 seconds.
HELP!! I NEED AN ANSWER!!
Why does an iron gate have the same properties as an iron frying pan?
O both are black
O both are non-mental
O both are magnetic
O both are made of the same type of atoms.
i need help with question 1 please
Answer:86
Explanation: to find atomic mass you take the number of protons and the number of neutrons. therefore you take the 40 protons and the 46 neutrons to find the mass. :)
Answer:
86
Explanation:
To find the answer i added the proton and neuron
Which of the following best describes the function of vacuoles?
O
Transferring energy throughout all kinds of cells
O
Storing materials in plant cells
Digesting food in animal cells
O
Protecting cells from the environment
They mainly store materials for other cells to use.
MnS+HCl H 2 S+MnCl 2 Which set of coefficients would balance the equation?
Answer:
1,2,1,1
Explanation:
Which choice below is not an example of a limiting factor:
Money
Space
Predators
Nutrients
Sunlight
A 75 Kg skateboarder is riding downhill, exerting 25 N. What is their acceleration?
Answer:
The answer is 0.33 m/s²Explanation:
The acceleration of an object given it's mass and the force acting on it can be found by using the formula
[tex]a = \frac{f}{m} \\ [/tex]
where
m is the mass
f is the force
a is the acceleration
From the question
f = 25 N
m = 75 kg
We have
[tex]a = \frac{25}{75} = \frac{1}{3} \\ = 0.333333333...[/tex]
We have the final answer as
0.33 m/s²Hope this helps you
Balancing Redox Reactions
VO2++MnO4 V(OH)4++Mn2+(acidic)
Answer:
MnO4- + 5 VO +2 + 11 H2O = 5 V(OH)4+ + Mn+2 + 2 H+
Explanation:
The balanced redox reaction is MnO⁴⁻ + 5 VO⁺² + 11 H₂O = 5 V(OH)⁴⁺ + Mn+2 + 2 H⁺.
What are redox reactions?Redox reactions are those reactions in which there is the transfer of electrons between different elements. These reactions are of two types, oxidation and reduction reactions. Examples are combustion, displacements, corrosion, and rusting reactions.
An example of a chemical reaction in which one or more electrons are lost is an oxidation reaction.
A reduction reaction is one in which one or more electrons are acquired during a certain kind of chemical reaction.
The formation of hydrogen fluoride is a redox reaction.
H₂ + F₂ = 2HF
H₂ = 2H + 2e⁻
F₂ + e⁻ = 2F⁻
Thus, the reaction is MnO⁴⁻ + 5 VO⁺² + 11 H₂O = 5 V(OH)⁴⁺ + Mn+2 + 2 H⁺.
To learn more about redox reactions, refer to the link:
https://brainly.com/question/13293425
#SPJ2
1 point
A 2.00 kg cart on a frictionless track is pulled by force of 3.00 N. What is
the acceleration of the cart?
1.5 m/s/s
O 3 m/s/s
6 m/s/s
.66 m/s/s
Answer:
The answer is 1.5 m/s²Explanation:
The acceleration of an object given it's mass and the force acting on it can be found by using the formula
[tex]acceleration = \frac{force}{mass} \\ [/tex]
From the question
force = 3 N
mass = 2 kg
The acceleration is
[tex]acceleration = \frac{3}{2} \\ [/tex]
We have the final answer as
1.5 m/s²Hope this helps you
A group of students is investigating how a force applied to an object affects the motion of that object. The diagram shows the setup for the investigation. To create a force, the students add a weight to the weight holder and observe whether the cart moves. The students repeat this step five times, using a different amount of weight each time. Identify the independent and dependent variables of this investigation.
Answer:
87 is the wight of the hight
Explanation:
If a package of nuts weighs 41.3 what is the massif package express in milligram
Answer:
1170855 mg
Explanation:
Limestone has a density of 2.72g/cm3. What is the mass of 24.9 cm3of limestone?
Answer:
density = mass ÷ volume
Explanation:
mass = volume × density
=24.9 cm3 × 2.72 g / cm3
=67.728 g
