Answer: The empirical formula is [tex]CH_2[/tex].
Explanation:
Mass of C = 1.71 g
Mass of H = 0.287 g
Step 1 : convert given masses into moles.
Moles of C = [tex]\frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{1.71g}{12g/mole}=0.142moles[/tex]
Moles of H = [tex]\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{0.287g}{1g/mole}=0.287moles[/tex]
Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.
For C =[tex]\frac{0.142}{0.142}=1[/tex]
For H =[tex]\frac{0.287}{0.142}=2[/tex]
The ratio of C: H = 1: 2
Hence the empirical formula is [tex]CH_2[/tex].
3Mg(OH)2 + 2H3PO4
Which lists the numbers of each atom the other half of the equation would contain?
Answer:3 Mg, 2 P, 14 O, 12 H
Explanation:
Answer: A
Explanation: just because
How many atoms are in 2.78 moles of carbon (C)?
Answer:
4.61/6
=0.7683 atom are there in 4.61 moles of carbon
Explanation:
1. 2g of calcium carbonate was added to 40 cm3 of hydrochloric acid of concentration 2 moldm-3.
Write a balanced equation for the reaction. (2 mrks)
The balanced equation :
CaCO₃ (s) + 2HCl (aq) → CaCl₂ (aq) + H₂O (l) + CO₂ (g)
Further explanationEqualization of chemical reaction equations can be done using variables. Steps in equalizing the reaction equation:
1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c etc.
2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index between reactant and product
3. Select the coefficient of the substance with the most complex chemical formula equal to 1
CaCO₃ (s) + HCl (aq) → CaCl₂ (aq) + H₂O (l) + CO₂ (g)
Give coefficient :
CaCO₃ (s) + aHCl (aq) → bCaCl₂ (aq) + cH₂O (l) + dCO₂ (g)
Ca, left=1, right=b⇒b=1
C, left=1, right=d⇒d=1
O, left=3, right=c+2d⇒3=c+2d⇒3=c+2.1⇒c=1
H, left=a, right=2c⇒a=2c⇒a=2.1⇒a=2
the equation becomes :
CaCO₃ (s) + 2HCl (aq) → CaCl₂ (aq) + H₂O (l) + CO₂ (g)
A roller coaster is accelerating at 10m/s² before it comes to an abrupt stop at the end of the ride. The mass of the roller coaster is 900 kg. How much force was exerted on the roller coaster to bring it to a stop?
Answer:
9000 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 900 × 10
We have the final answer as
9000 NHope this helps you
Which cell organelle is like the construction site, where proteins are built? Which cell organelle packages and transports the protein to the food processing plant?
O vacuole, endoplasmic reticulum
O cell membrane, lysosome
Onbosomes, golgi bodies
O nucleus, mitochondria
Explanation:
The endoplasmic reticulum consists of a network of a tube-like passageway through which proteins from the ribosomes are able to be moved within a cell as the road system allows for movement throughout the city.
Which of the following can you physically change for a pure substance such as water, without altering the chemical composition?
a. melting point
b. density
c. color
d. state of matter
Which of the following is accurate about the octet rule? -please explain your reasoning for answer
Most of the time, nonmetals will form four covalent bonds in order to achieve a stable octet.
Fluorine, nitrogen, and oxygen can form more or less than four bonds and still satisfy the octet rule.
Answer:
Most of the time, nonmetals will form four covalent bonds in order to achieve a stable octet.
WILL MARK BRAINLIEST!!
HELP PLEASE!! What is the UNabbreviated electron configuration for Na and Ar
Answer:
Na 1s2 2s2 2p6 3s1
Ar 1s2 2s2 2p6 3s2 3p6
Explanation:
What is the speed of a car that has traveled 100 miles in 20 hours?
|
Answer:
5 mph
Explanation:
100 miles, 20 hours (divide by 2)
50 miles, 10 hours (divide by 2)
25 miles, 5 hours (divide by 2)
divide both sides by 5
5 miles, 1 hour
Answer:2
Explanation:
What is a reaction rate? PLEASE HELP
a. measure of the potential energy differences in reactants and products
b. measure of the activation energy needed
c. measure of how fast products are made
d.measure of collisions between molecules
Answer:
c
Explanation:
Reaction rate, in chemistry, the speed at which a chemical reaction proceeds.if you're studying the same thing I am then that would be it
What would be the electron configuration of Copper (Cu)?
Explanation:
In order to write the Copper electron configuration we first need to know the number of electrons for the Cu atom (there are 29 electrons). Once we have the configuration for Cu, the ions are simple. When we write the configuration we'll put all 29 electrons in orbitals around the nucleus of the Copper atom.
Therefore the expected electron configuration for Copper will be 1s22s22p63s23p64s23d9.
Half-filled and fully filled subshell have got extra stability. For the Cu+ ion we remove one electron from 4s1 leaving us with: 1s22s22p63s23p63d10.
For the Cu2+ ion we remove a total of two electrons (one from the 4s1 and one form the 3d10) leaving us with 1s22s22p63s23p63d9
Therefore, 1s22s22p63s23p63d9.
Hope this helps. Also note that copper is an exception to the rules for writing electron configurations.
Explain why only protons and neutrons are used to calculate mass number
Answer:
The number of neutrons is variable, resulting in isotopes, which are different forms of the same atom that vary only in the number of neutrons they possess. Together, the number of protons and the number of neutrons determine an element's mass number.
Which of the following statements is FALSE?
H2SO4 + 2 NaOH → Na2SO4 + 2 H2O is a double replacement reaction
2 KClO3 →KCl + 2 O2 is a decomposition reaction.
C6H12 + 9 O2 → 6 H2O + 6 CO2 is a single replacement reaction
CO2 + Na2O → Na2CO3 is a synthesis reaction
Answer: ITS FALSE
ExplaC6H12 + 9 O2 → 6 H2O + 6 CO2 is a single replacement reaction
nation:
How does the ionosphere help radio transmission?
Explanation:
ionosphere can reflect radio waves directed into the sky back toward the Earth
Convert 2.5x10^6mm to km
Answer:
2.5 kilometers
Explanation:
(e)
6.8 g of hydrogen peroxide decomposes to produce 3.6 g of water.
Calculate the mass of oxygen produced when 68 g of hydrogen peroxide
decomposes.
The mass of oxygen produced when 68 g of hydrogen peroxide decomposes is 32g.
What is the relation between mass & moles?Relation between the mass and moles of any substance will be represented as:
n = W/M, where
W = given massM = molar massChemical reaction:
2H₂O₂ → 2H₂O + O₂
Moles of 68g of H₂O₂ = 68g / 34g/mol = 2mol
From the stoichiometry of the reaction:
2 moles of H₂O₂ = produces 1/2×2 = 1 mole of O₂
Mass of 1 mole of O₂ = (1mol)(32g/mol) = 32g
Hence required mass of oxygen is 32g.
To know more about mass & moles, visit the below link:
https://brainly.com/question/20838755
#SPJ2
What is specific heat? How are the factors affecting it?
Answer:
Specific heat, ratio of the quantity of heat required to raise the temperature of a body one degree to that required to raise the temperature of an equal mass of water one degree.
Explanation:
by dividing the heat capacity by the quantity of substance in a body, the resulting specific heat capacity is a function of the structure of the substance itself. In particular, it depends on the number of degrees of freedom that are available to the particles in the substance, each of which type of freedom allows substance particles to store thermal energy.
How many electrons are in the valence shell?
a. three
b. two
c. five to eight
d. four
e. one
What is the mass of 5.4 x 10^24 molecules of HCl?
Answer:
I KNOW
Explanation:
In the Periodic Table, the vertical columns that extend down the Periodic Table are called
A. periods.
B. Groups.
C: Classes
D: Rows
Answer:
b
Explanation:
Convert 48.5 grams of water to moles of water
Answer:
2.70 mol of water.
Explanation:
divide the given mass by the molar mass of water. 48.5 / 18.016g = 2.70 mol water.
Oxygen is most chemically similar to
Anitrogen
Bsulfur
Cfluorine
Answer:
Nitrogen is the answer
Which two of the minerals shown have a metallic luster?
Answer:
A and D
Explanation:
Answer:
A & D
Explanation:
Which element has an electron configuration that ends in the fourth energy 1 point
level? *
D
ОО
C
Answer:
here
Explanation:
which is the halogen that is in Period 5? a. iodine (I) b. strontium (Sr) ... 4. Which is a transition element with five d-block electrons in energy level 4? ... Which region contains elements with an electron configuration that ends with p3? a. A b.
Missing: point | Must include: point
which group of mamaals has the most mebers
Infraclass: Placentals
Placental mammals are the most diverse group of mammals with about 4000 discovered species.
Which of the following have the correct pairing of ion charge to the number of protons and electrons that would
deliver that charge for the ion written?
Select ALL that apply.
Select all that apply
А. 0-2: 8 protons and 4 electrons
B. Na+l: 11 protons and 10 electrons
С. N-3.7 protons and 10 electrons
D. Al 3. 13 protons and 16 electrons
Answer:
Explanation:
O-2 means that there are 2 more electrons than protons. This one is incorrect.
Na + 1 is correct. 11 protons and 10 electrons.
N-3 is correct 7 protons and 10 electrons.
AL+3 is incorrect. It goes the other way 13 protons 10 electrons.
identify the element present in the following compound zinc chloride
Answer:
Zinc Chloride: ZnCl2
Molar Mass: 136.315 grams per mole
Density: 2.907 grams per cubic centimetre
Melting Point: 563 K (290oC)
Boiling Point: 1005 K (732oC)
Explanation:
Brainliest please?
boron phosphite
Formula please help fast please please help me please please help
Answer: The formula for boron phosphite is BP
Explanation:
The answer would be BP
Hope this helped!
how many elements and atoms are in tylanol
Answer:
Element Symbol # of Atoms
Hydrogen H 9
Carbon C 8
Nitrogen N 1
Oxygen O 2
Explanation:
there are 5 elements
Transcription of the sequence TTA AGC produces which sequence?
AAT UCG
AAT TGC
UUT TCC
AAU UCG
Answer:
AAU UCG
Explanation:
According to the base-pairing rule, the purine bases always pair with the pyrimidine bases. More specifically, Adenine always pairs with Thymine/Uracil while Guanine always pairs with Cytosine.
T - A
T - A
A - U
A - U
G - C
C - G
Hence, the transcription of the sequence TTA AGC will produce AAU UCG.
