Answer:
In chemistry, the letter "H" represents the enthalpy of a system
Explanation:
Write a balanced equation for the complete oxidation reaction that occurs when ethane burns in air
Alkanes are saturated hydrocarbons that have single bonds in chains
General formula for alkanes :
[tex]\tt \large{\bold{C_nH_{2n+2}}[/tex]
Hydrocarbon combustion reactions (specifically alkanes)
[tex]\large {\box {\bold{C_nH _ (_2_n _ + _ 2_) + \dfrac {3n + 1} {2} O_2 \Rightarrow nCO_2 + (n + 1) H_2O}}}[/tex]
So that the burning of ethane with air (oxygen):
[tex]\tt C_2H_6+\dfrac{7}{2}O_2\rightarrow 2CO_2+3H_2O[/tex]
2C₂H₆ (g) + 7O₂ (g) ⟶ 4CO₂ (g) + 6H₂O (ℓ)
or we can use mathematical equations to solve equilibrium chemical equations by giving the coefficients for each compound involved in the reaction
C₂H₆ (g) + aO₂ (g) ⟶ bCO₂ (g) + cH₂O (ℓ)
C : left 2, right b ⇒ b=2
H: left 6, right 2c⇒ 2c=6⇒ c= 3
O : left 2a, right 2b+c⇒ 2a=2b+c⇒2a=2.2+3⇒2a=7⇒a=7/2
A black rock has a mass of 12.5 grams. When dropped into a graduated cylinder, the volume rises from 20 ml to 24 ml. What is the density of the rock?
Answer:
3 g/mL
Explanation:
Density is mass divided by volume (g/mL).
Mass of rock = 12.5
Volume of rock = 24-20 = 4mL
Density of rock = 12.5g/ 4mL = 3.125 g/mL
Round to the lowest number of significant figures which is 1 to get 3 g/mL
What type of variable is held constant in an experiment?
Answer:
A variable in an experiment which is held constant in order to assess the relationship between multiple variables, is a control variable.
Explanation:
Someone help me quick! Will give brainliest
Answer:
WHY DO YOU NEED HELP HUH
DON'T CHEAT READ AND STUDY
Explanation:
Answer:
It's C
Explanation:
Line M passes through the points (-5, 9) and (-1,9).
12
10-
8
6
2
-12-10-8-6-4-22
2
6 8 10 12 X
6
-10
-12-
Which is true of line M?
Answer:
line m is vertical line with an undefined slopel line correct answer is 6 8 10 12 x
a cylindrical object has a diameter of 1.25 cm and a height of 6.48 cm. what is its volume?
The volume of cylinder = 7.948 cm³
Further explanation
Volume is a derivative quantity derived from the length of the principal
The unit of volume can be expressed in liters or milliliters or cubic meters
The volume of the aquarium is almost the same as the beam namely:
V = length x width x height
The volume of a cylinder can be formulated :
[tex]\tt V=\pi.r^2.h[/tex]
r = radius
h = height
radiusDiameter of cylinder = 1.25 cm
radius=r :
[tex]\tt \dfrac{1.25}{2}=0.625~cm[/tex]
volume[tex]\tt V=\pi\times 0.625^2\times 6.48\\\\V=\boxed{\bold{7.948~cm^3}}[/tex]
Which trait is inherited? (1 point)
physical fitness
scars
hair length
freckles
Answer:
freckles.........
You can inherit freckles from your family but you cant inherit hair length, physical fitness, or scars due to the fact you can cut your hair any length.You can gain scars from any wound. whereas Physical fitness comes from how healthy you are to perform aspects of sports, occupations and daily activities.
Answer:
Freckles
Explanation:
Because everything else is specific to a person. And these things are ones own personality and not born with.
Is the flame test a test for the cation (metal listed first) or the anion (nonmetal listed second)?
Answer:
the answer is metal hope it helps
Explanation:
Which stament describes the atoms of an element?
Answer:
A smallest particle of an element that can take part in a chemical reaction is called an atom.
Explanation:
How many atoms are there in 4.13 moles of nickel (Ni)
Answer:
2.48626 x 10^24
Explanation:
We multiple 4.13 by avogadro's number to get that.
Which three types of electromagnetic waves have longer wavelengths than the waves that make up visible light?
O radio waves, gamma rays, X-rays
O gamma rays, infrared light, X-rays
O microwaves, radio waves, infrared light
infrared light, ultraviolet light, microwaves
Answer:
O microwaves, radio waves, infrared light
Explanation:
Answer: C. microwaves, radio waves, infrared light
Explanation: C. Microwaves, Radio Waves, Infrared light
Classify the following reactions and complete the given below
A) NaCl + AgNO3 - NaNO3 + AgCl
Answer:
chemical equation balance.
Explanation:
if you need more explanation , comment.
How many carbon atoms are there for every 2 oxygen atoms in CO2? A. 1 B. 2 C. 3 D. 4
Answer:
I think it's 1, but if that's wrong I'm really sorry
When an electron beam strikes a block of copper, x-rays of frequency 6 x 10^18 Hz are emitted. What is the wavelength of these x-rays? Answer in units of pm.
Answer:
0.5×10² pm
Explanation:
Given data:
Frequency of x-ray = 6×10¹⁸ Hz
Wavelength of x-ray = ?
Solution:
Wavelength is designated as "λ" and it is the measured in meter. It is the distance between the two crust of two trough.
Formula:
speed of wave = wavelength × frequency
speed = 3×10⁸ m/s
now we will put the values in formula.
3×10⁸ m/s = λ × 6×10¹⁸ Hz
Hz = s⁻¹
λ = 3×10⁸ m/s / 6×10¹⁸ s⁻¹
λ = 0.5×10⁻¹⁰ m
m to pm
0.5×10⁻¹⁰ m × 10¹² pm/1m
0.5×10² pm
A sample of gas has a volume of 10 ml at 2 atm. The pressure increases to 4 atm. What is the new volume?
Answer:
The answer is 5 mLExplanation:
In order to find the new volume we use the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
Since we are finding the new volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]
We have
[tex]V_2 = \frac{10 \times 2}{4} = \frac{20}{4} \\ [/tex]
We have the final answer as
5 mLHope this helps you
Were you able to identify each expression?
Answer:
Yes.
Explanation:
The expression are easy and clear to understand when a person expresses his inner state. The expression are a natural reaction which a person demonstrates and mostly these expressions are instant and unintended.
Write the chemical formula for the following: potassium fluoride
Answer:
KF
Explanation:
Potassium = K
Fluoride = F
[tex]K^{+1}F^{-1}K_{1} F_{1}=KF[/tex]
Answer:
KF is your answer. Can I get Brainliest
describe the purpose of using a chemical equation.
Answer:
The purpose of using a chemical equation is to keep track of elements and the number of atoms of each of the elements on each side of the equation. ... They use symbols and formulas to show the chemical reaction so that chemical names do not need to be written out.
Answer:
:0
Explanation:
Sample Response: Chemical equations show how chemicals interact when a reaction occurs. They use symbols and formulas to show the chemical reaction so that chemical names do not need to be written out. They also help keep track of all elements and the number of atoms of each element on each side of the equation.
Explain why warm air temperature has lower air pressure than cold air?
Answer:
Differences in temperature cause differences in air density. Warmer air is less dense than cold, which is why warm air tends to rise and cold air sinks.
temparature affects particles. warm particles are more spread out.
Explanation:
. Being acted on by gravity, colder, denser air weighs more and exerts greater pressure per unit area.
What is the oxidation number of Gallium?
Answer: +3
Explanation: Gallium liquefies just above room temperature. Gallium is a soft solid, however it quickly becomes liquid when heated.
9. What is the density of brass, a copper-zinc alloy, if a block displacing 40.8 cm3 weighs 324 grams?
Answer:
The answer is 7.94 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
mass = 324 g
volume = 40.8 cm³
We have
[tex]density = \frac{324}{40.8} \\ = 7.941176...[/tex]
We have the final answer as
7.94 g/cm³Hope this helps you
Which of the following is the least likely to remain homogeneous?
. O A. All of these
O B. A supersaturated solution
O C. An unsaturated solution
O D. A saturated solution
Answer:
all
of them
Explanation:
Elena held a rock weighing 1 N in her hand. The rock has no velocity.
KE________?
KE = 0
Further explanationEnergy is the ability to do work
Energy because its motion is expressed as Kinetic energy (KE) which can be formulated as:
[tex]\large{\boxed{\bold{KE=\frac{1}{2}mv^2}}}[/tex]
So for two objects that have the same speed, the greater the mass of the object, the greater the kinetic energy
The stone in hand is in a motionless state (at rest) so that its velocity (v) = 0, so it has no kinetic energy
But this stone can have potential energy that is gained due to its height
An atom is the simplest substance known and provides the building block from which all matter is composed.
True or false
“Jesus came to serve. How is He calling me to serve?”
Answer:
...
Explanation:
Which statement accurately describes an object's weight and mass?
A. Its mass changes with gravitational force, but its weight does not.
B. Both its weight and its mass are the same everywhere in the
universe.
O
C. Its weight is the same everywhere in the universe, but its mass is
not.
O D. Its weight changes with gravitational force, but its mass does not.
Answer:
i believe its A
so sorry if i got it wrong
Explanation:
Conservation of Mass in Chemical Reactions: 7th grade Science
Question: In a chemical reaction, the total mass of the reactants is 10.0 grams. After the reaction, the total mass of the products must be
A. More than 10.0 grams
B. Exactly 20.0 grams
C. Exactly 10.0 grams
D. Less than 10.0 grams
Answer:
After the reaction, the total mass of the products must be D. Less than 10.0 grams
An increase in which of the following would increase the boiling point of a
liquid?
Answer:
The boiling point increases with increased pressure up to the critical point, where the gas and liquid properties become identical.
What is the chemical equation of Dr. Jeff’s demonstration using a battery to light steel wool on fire. What is the chemical equation? Please explain! Will give brainliest if correct and explained well ;D
E=x +c - D Emonety to explain the functionally full process of work and C3
Answer: The Equation:
Iron + oxygen → iron oxide
2Fe(s) + 3/2 O2(g) → Fe2O3(s)
Explanation:
can someone actually help me with this?
Question: What is the subatomic composition of technetium-100 (Z = 43), if a cation of Tc has lost three electrons?
i need to find the protons, neutrons, and electrons. :((
Answer:
p = 43, n = 57, e = 40
Explanation:
Z is the number of protons. The number of neutrons, subtract Z from the isotope number (100). To begin with, protons and electrons are equal in an atom, but this atom lost three, so subtract 3 from Z.
Z= # of protons = 43
100 - 43 = 57 neutrons
43 - 3 = 40 electrons.
