help help help plsss
Answer:
4.58×10^3
3.72×10^7
Explanation:
3.8×10^2 =380
+ 4.2×10^3=4200
= 4580 = 4.58×10^3
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:
(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:
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Which is a diatomic molecule?
Na-CI
o=O
H-F
Si-O
which one
Separate the following gene sequence into codons: TACGTCTTACGCTATGTC
Answer really quick plssss
Answer:
I think it's AUGCAGAAUGCGAUACAG
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:
Oxygen is most chemically similar to
Anitrogen
Bsulfur
Cfluorine
Answer:
Nitrogen is the answer
A coffee cup calorimeter contains 153.21 g of water at 22.50 °C. A 65.454 g piece of iron is heated to 101.62 °C. The piece of iron is added to the coffee cup caloriemter and the contents reach thermal equilibrium at 25.68 °C. The specific heat capacity of iron is 0.449 Jg·K and the specific heat capacity of water is 4.184 Jg·K. How much heat, , is lost by the piece of iron?
Answer:
Q = 2232J
Explanation:
In the system, the energy that is lost by the iron is:
Q = S*ΔT*m
Where Q is heat, S is specific heat of iron ΔT is change in temperature and m is mass of the piece of iron.
S = 0.449J/gK
ΔT = 101.62°C - 25.68°C = 75.94°C
m = 65.454g
Q = 0.449J/gK*75.94°C*65.454g
Q = 2232J
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.
What is the amplitude ?
Answer: The amplitude is a measure of the strength or intensity of the wave
Explanation: when looking at a sound wave, the amplitude will measure the loudness of the sound.
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!
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
Which is a compound?
A. Orange and black shirts in a drawer
B. An alloy of copper and iron
C. Silicon and carbon in a molecule
D. A copper statue
please help, on a pex ! brainliest and an extra 50 points if right
Explanation:
c Silicon and carbon in a molecule
what describes a property of all elements
Ples help is it Fission, Fusion, or Both 1. Incredibly high amounts of energy are released. ____ 2. Results in a nuclear change. ______ 3. The end product is heavier. _____ 4. Two nuclei become one. ____ 5. The end product is lighter. ____
Answer:
1. fission
2. both
3. fusion
4. fusion
5. fission
Explanation:
Fission refers to the splitting of a single nucleus into two or more small nuclei while fusion refers to the combination of two or more small nuclei into one heavy nucleus.
When a single heavy nucleus splits, energy is released and the end products are 2 or more lighter nuclei. On the other hand, when several light nuclei fuse into one nucleus, energy is absorbed and the end product is one heavy nucleus. Both fission and fusion result in a nuclear change.
Which two of the minerals shown have a metallic luster?
Answer:
A and D
Explanation:
Answer:
A & D
Explanation:
In sexual reproduction, a genetic mutation can ONLY be passed down to the offspring if it occurs in the sex cells.
True
False
Snow is a form of
E: evaporation
F. precipitation
G. condensation
H. transpiration
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
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?
Help as fast possible I’ll mark you bbrainlist
Answer:
the farther they are the longer there cycle is. closer they are shorter time.
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 group of mamaals has the most mebers
Infraclass: Placentals
Placental mammals are the most diverse group of mammals with about 4000 discovered species.
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:
If 150 g of sucrose dissolved in a 1.50 L water what is the molarity of a solution
Answer:
0.2923 molar
Explanation:
M = given mass /(molar mass× volume)
150/342(1.5)
150/513
0.2923M
The size of an atom would be described in _______.
Answer:
atomic radius
Explanation:
so radius
Answer:
Explanation:
The average size of an atom is about 100 picometers or one ten-billionth of a meter. Almost all of the mass of an atom is in its nucleus; almost all of the volume of an atom is occupied by electrons. The number of protons (also known as its atomic number) determines the element. Varying the number of neutrons results in isotopes.
Throwing a snow ball during a snow
ball fight is most like an example of
R. weathering
S. erosion
T. deposition
V. accumulation
Answer:
S. Erosion
Explanation:
The study of chemical bonds is called chemistry.
The correct answer is S.
The removal of the upper layer of the soil is called soil erosion.
According to the question, the snowball fight leads to soil erosion as the upper layer of the soil or snow is used to make a snowball and remove the upper layer.
Hence, the correct answer is S that is erosion.
For more information, refer to the link:-
https://brainly.com/question/12985618
When water goes from its liquid state to a gas which are being broke
Answer:
Studies have revealed that evaporation—the process by which water changes from a liquid to a gas—from oceans, seas, and other bodies of water (lakes, rivers, streams) provides nearly 90% of the moisture in our atmosphere. Most of the remaining 10% found in the atmosphere is released by plants through transpiration.
Explanation:
Intermolecular forces do not have any effect on determining the physical properties of
substances such as surface tension and melting point.
True or false
Answer:
False
Explanation:
The physical properties of melting point, boiling point, vapor pressure, evaporation, viscosity, surface tension, and solubility are related to the strength of attractive forces between molecules. These attractive forces are called Intermolecular Forces.
