Answer:
2.38x10²³ atoms oxygen
Explanation:
To solve this question we need to convert the mass of sand to moles using its molar mass (Molar mass SiO₂ = 60.08g/mol). Twice these moles are the moles of Oxygen and using Avogadro's number we can find the amount of atoms of Oxygen in the mixture:
Moles SiO₂:
11.87g * (1mol / 60.08g) = 0.1976moles SiO₂
Moles Oxygen:
0.1976moles SiO₂* 2 = 0.3951moles oxygen
Atoms oxygen:
0.3951moles oxygen * (6.022x10²³atoms / 1mol O₂) =
2.38x10²³ atoms oxygenWhich characteristic is true of sexual reproduction but not of asexual reproduction?
Answer:
j one or more parents. that's the answer
A gas at 127 celsius and 10.0 L expands to 20.0 L. What is the new
temperature in kelvin? (You must convert to Kelvin before calculating
this problem
Answer:
T₂ = 800 K
Explanation:
Given that,
Initial temperature of the gas, T₁ = 127°C = 400 K
Initial volume, V₁ = 10 L
Final volume, V₂ = 20 L
We need to find the new temperature.
The volume of a gas is directly proportional to its Kelvin temperature.
Let T₂ is the new temperature. So,
[tex]\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}\\\\T_2=\dfrac{V_2T_1}{V_1}\\\\T_2=\dfrac{20\times 400}{10}\\\\T_2=800\ K[/tex]
So, the new temperature of the gas is 800 K.
The dull coating, or tarnish, on an aluminum lawn chair is produced by a
redox reaction between aluminum and oxygen. What occurs during this
reaction?
A. A double-replacement reaction takes place.
B. The reaction is a single-replacement reaction.
O C. Aluminum atoms lose electrons to oxygen atoms.
D. Aluminum atoms gain electrons from oxygen atoms.
Option C. Aluminum atoms lose electrons to oxygen atoms.
Answer:
C. Aluminum atoms lose electrons to oxygen atoms.
How I Know :
hope this helps you ! good luck ! :)
add me as a friend , ill add back so we can be friends !! <3
☆ REMINDER : ☆
☁ ˖⁺ stay safe we are still in the middle of a pandemic
☁˖⁺ drink plenty of water to stay hydrated
☁ ˖⁺ love yourself and know someone loves you
☁ ˖⁺ never give up and talk to someone if your feelings scared/sad/mad
☁ ˖⁺ its never okay to stay silent .
﹤୨♡୧﹥ have an amazing day/night
Will mark brainiest!!!! Also I posted other questions
Answer:
Crash sensors measure how quickly a vehicle slows down in a frontal crash or accelerates to the side in a crash Some vehicles are equipped with a sensing system designed to detect the onset of a rollover crash Rollover crash sensors may be located in the ecu or at the center of the vehicle
The the Crash trip sensors in cars that send an electric signal to an ignitor The heat generated causes sodium azide to decompose into sodium and nitrogen gas which inflates the airbags
Explanation:
have a nice day
how many molecules are in SO4
Answer:
there are 5 molecules in SO⁴
What is the SI unit of time?
A.
second
B.
minute
C.
hour
D. day
Answer:
option a. second
.............
what is an acid containg oxygen?
Explanation:
An oxyacid, oxoacid, or ternary acid is an acid that contains oxygen. Specifically, it is a compound that contains hydrogen, oxygen, and at least one other element, with at least one hydrogen atom bonded to oxygen that can dissociate to produce the H+ cation and the anion of the acid.
Answer:
oxyacid, oxoacid
Explanation:
An oxyacid, oxoacid, or ternary acid is an acid that contains oxygen. Specifically, it is a compound that contains hydrogen, oxygen, and at least one other element, with at least one hydrogen atom bonded to oxygen that can dissociate to produce the H+ cation and the anion of the acid.
anyone know this? i’m having trouble...please help.
How moles are in 45.7g of CH3?
first find the atomic weight of CH3 which would be
atomic weight: 12.011 (3×1.008) = 36.32 g/mol
then find the moles in the given mass
36.32 ÷ 45.7 = 0.794
I HOPE I'M NOT WRONG I HAVENT DONE CHEM IN SO LONG
Ammonia (NH3) reacts with oxygen (O2) to produce water and nitric oxide (NO). How many grams of water are produced when 22.5 grams of oxygen are reacted?
Balance Na + SO3 = Na2SO3
What do plants need in order to make food?
A. water, energy, oxygen
B.carbon dioxide, energy, oxygen
C.water, energy, carbon dioxide
D.water, oxygen, carbon dioxide
Answer:
Water, solar energy, carbon dioxide
Explanation:
I need help pls I don’t know this kne
Answer:
C. A one (1) is assumed when there is no coefficient
Explanation:
The following chemical equation is given in the attachment:
2H2 + O2 → 2H2O
In this reaction, Hydrogen (H2) and oxygen (O2) gases are the reactants and they combine to form H2O, which is the product. It is necessary that, in accordance to the law of conservation of matter, the same number of atoms of each elements on the reactant side equates that on the product side. When this happens, the equation is said to be BALANCED.
However, to balance an equation, COEFFICIENTS are used. In this equation above, coefficients 2 is used in front of both H2 and H2O but no coefficient is used in front of O2. This is because 1 mole of oxygen is on the reactant and product side respectively. However, one is assumed when no coefficient is written i.e. O2 means 1 mole of oxygen molecule.
What do you know about a substance if you know it’s temperature?
Answer:
A. How hot or cold the substance is.
Explanation:
If we know the temperature of the substance
we can know how hot or cold the substance is.
And as we know temperature is the degree of hotness or coldness of a body.
Why are poisons used less today than they were in the past? What factors influenced this change.
Answer:
Poisons are used less today than they were in the past because forensic scientists can easily detect many substances and toxins during an autopsy.
The main factor that influenced this change is advancements in forensic toxicology knowledge and technology.
good luck, i hope this helps :)
Explanation:
Today poisons are used less because forensic scientists now have much more equipment and have an easier time at identifying poisons like arsenic, which were not so easy to find in the past. The main factor influencing this change is the new technology and knowledge that was unavailable in the past.
A typical tincture of iodine contains about 2.0% iodine by mass. Calculate
the mass of iodine in a 500. g tincture.
Explain what a catalyst is and give an example of a transition as one.
Answer:
Catalyst, in chemistry, any substance that increases the rate of a reaction without itself being consumed.
...
Catalyst.
process catalyst
ammonia synthesis iron
sulfuric acid manufacture nitrogen(II) oxide, platinum
cracking of petroleum zeolites
If you are traveling at 40 miles per hour, how long will it take you to travel
80 miles?
Answer:
2hours
Explanation:
40miles=1hr
80miles=80÷40=2
2hours
How many atoms of oxygen are in a molecule
of
glucose (C6H1206)?
Be sure to use the correct place value.
Answer:
Um... 6
Explanation:
C6H12O6
The O is oxygen and the 6 is the exact number of atoms
What season is it in earths northern hemisphere when earths northern hemisphere tilts toward the sun
Answer:
Summer
Explanation:
Earth's tilted axis causes the seasons. Throughout the year, different parts of Earth receive the Sun's most direct rays. So, when the North Pole tilts toward the Sun, it's summer in the Northern Hemisphere. And when the South Pole tilts toward the Sun, it's winter in the Northern Hemisphere.
Hope it helped!! Please mark as Brainliest!
Answer:
Summer took the test and got it right
Explanation:
Which season will the northern hemisphere experience when the axis of Earth is tilted towards the sun?
Summer
Students are completing an investigation on types of heat transfer. For one part of the investigation, they place their hand on a cool window and feel the difference in thermal energy. When they are touching the glass, what type of heat transfer are they experiencing?
a .Conduction
b. Convection
c. Radiation
When kci dissolved in ethanol what is the intermolecular attraction between k+ ions and ethanol molecules
Answer:
ion-dipole interaction
Explanation:
Ethanol is a polar molecule due to the presence of the polar O-H group in the molecule. This means that the molecule has a dipole moment.
The positive end of the dipole lies on hydrogen while the negative end of the dipole lies on oxygen.
When KCl is dissolved in ethanol, K^+ ions can interact with the negative end of the dipole in ethanol by ion-dipole interaction.
What is the molecular formula for C5H7 if its molar mass is 536 g/mol?
Answer:
(C5H7)8
Explanation:
It's empirical formula is given as; C5H7
Molar mass of carbon(C) = 12 g/mol
Molar mass of hydrogen(H) = 1 g/mol
We are told that it's molar mass is 536 g/mol.
To find the molecular formula;
Molecular formula = n × empirical formula
Thus;
n = 536/((12 × 5) + (1 × 7))
n = 8
Thus;
Molecular formula = (C5H7)8
Some seawater is evaporated. The sea salt obtained is found
to be 86% sodium chloride. How much sodium chloride
could be obtained from 200 g of this salt?
Answer:
the answer is 172g
Explanation:
200 × 0.86 = 172g
In order to produce CO2, a student put a sample of calcium carbonate in a flask and added hydrochloric acid using the following equation: Ca(CO3) + HCl → H2O + CO2 + CaCl2 The student finds the mass of CO2 generated to be 100 g. If the student began with 200 g of HCl and there was ample CaCO3 left unreacted, what was the percent yield?
Answer:
82.9% Is the percent yield
Explanation:
First, we need to balance the equation.
Ca(CO3) + 2HCl → H2O + CO2 + CaCl2
Since the problem tells you that the excess reactant is Ca(CO3), we just need to Stoichiometry to solve for the theoretical yield.
[tex]\frac{200g HCl}{1}[/tex] x [tex]\frac{1 mole HCl}{36.46gHCl}[/tex] x [tex]\frac{1 mol CO2}{2molHCl}[/tex] x [tex]\frac{44.01CO2}{1molCO2}[/tex] =120.707 g (theoretical yield)
Take your actual yield of 100g, divide that by 120.707, then multiply that decimical by 100.
Explain why is ortho nitrophenol more acidic than ortho methoxyphenol
Answer:
Ortho nitrophenol is more acidic than ortho-methoxyphenol.
Reason:
This is because the nitro-group is an electron-withdrawing group. In the case of ortho methoxyphenol; methoxy group is an electron-releasing group. Thus, it increases the electron density in the O−H bond and hence, the proton cannot be given out easily.
Hope this helps you. Do mark me as brainliest.
Oddly shaped bones like your vertebrae and pelvis? a.irregular bones c. short bones b. flat bones d. long bones
Which best represents a physical change?
A. formation of a new substance
B. formation of a precipitate
C. condensation
D. bubbling
Answer:
The answer I would go with is A formation of a new substance.
Explanation:
This is because physical change includes changes of state. Some could be changing from a liquid to gas or solid to gas. B is not even an answer that should be considered because it doesn't fit into the category. C and D represents some of the examples of the process of physical change. Like boiling, bubbling, melting, or freezing. So the best would be A.
Explain why hydrocarbons are present in so many different compounds.
Answer:
Many hydrocarbons are found in plants, animals, and their fossils; other hydrocarbons have been prepared in the laboratory. We use hydrocarbons every day, mainly as fuels, such as natural gas, acetylene, propane, butane, and the principal components of gasoline, diesel fuel, and heating oil.
Calculate the molarity for a solution containing 0.34 moles of NaNO3 dissolved in 0.5 liter of
water.
Answer:
0.68 mol/L
Explanation:
M=m/l
m is moles and l is liters
Since they gave us the values in the correct units, all we have to do it plug it in
M=0.34 mol/0.5 liters
M=0.68