Answer:
Number of moles = 0.01 mole
Explanation:
Given data:
Volume of gas = 0.1 L
Number of moles = ?
Temperature of gas = 25.0°C
Pressure of gas = 2.50 atm
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
25+273K = 298 K
by putting values,
2.50 atm × 0.1 L = n × 0.0821 atm.L/ mol.K × 298 K
0.25 atm.L = n × 24.47atm.L/ mol
n = 0.25 atm.L /24.47atm.L/ mol
n = 0.01 mol
Why do scientists use the scientific method?
Answer:
I think that the first one is right(A)
What coefficient will balance the equation that is shown?
___ H2O → 2H2 + O2
Answer:
The coefficient is 2
Explanation:
count the Number of hydrogen and oxygen elements on both sides. They should be equal.
The element with 12 protons in its nucleus is
a. magnesium
b. zinc
c. boron
d. carbon
Answer:
A.Magnesium
Explanation:
Answer:
magnesium
Explanation:
PLZ HELP !!!!!
Which statement correctly describes the main difference between body waves and surface waves?
Select one:
Surface waves are only longitudinal waves and body waves are only transverse waves.
Surface waves only travel across oceans and body waves travel across the Earth’s crust.
Surface waves are less damaging to man-made structures than body waves.
Surface waves travel across the Earth’s surface and body waves travel through the Earth’s interior.
Surface waves travel across the Earth’s surface and body waves travel through the Earth’s interior.
there you go :)
Estimate: Press Reset. Select Atoms, and using the slider, start with 1.000 × 1023 atoms of sulfur. (Note that pressing Start puts atoms into the atom counter, not the jars.)
Is this amount more or less than one mole?
Place the jar underneath the counter. Was the jar completely filled?
How many moles do you have?
Answer:
1) The amount is less than one mole, 2) The jar is not completely filled, 3) We have 0.166 moles of sulfur.
Explanation:
We proceed to respond each question below:
1) Is this amount more or less than one mole?
According to the Avogadro's Number, one mole of an element contains about [tex]6.022\times 10^{23}[/tex] atoms. Given that we have [tex]1.000\times 10^{23}[/tex] atoms, then we conclude that this amount is less than one mole.
2) Place the jar underneath the counter. Was the jar completely filled?
Let suppose that the jar can contain up to a mole of sulfur. Then, we conclude that jar is not completely filled.
3) How many moles do you have?
The amount of moles is determined by dividing the current amount of atoms by Avogadro's Number:
[tex]x = \frac{1.000\times 10^{23}\,atoms}{6.022\times 10^{23}\,\frac{atoms}{mole} }[/tex]
[tex]x = \frac{500}{3011}\,mole[/tex]
We have 0.166 moles of sulfur.
How many atoms are in 8.00 moles of potassium chromate?
Answer:
481.6x10^23
Explanation:
Answer:
[tex]\boxed {\boxed {\sf About \ 4.82 *10^{24} \ atoms \ K_2CrO_4}}[/tex]
Explanation:
To convert from moles to atoms, Avogadro's Number must be used.
[tex]6.022*10^{23}[/tex]This number tells us how many particles (atoms, molecules, ions. etc.) in 1 mole of a substance. In this case, it is atoms of potassium chromate (K₂CrO₄) in 1 mole.
[tex]6.022*10^{23} \ atoms \ K_2CrO_4 / 1 \ mol \ K_2CrO_4[/tex]
Use this number as a fraction.
[tex]\frac{6.022*10^{23} \ atoms \ K_2CrO_4}{1 \ mol \ K_2CrO_4}[/tex]
Multiply by the given number of moles (8.00).
[tex]8.00 \ mol \ K_2CrO_4 *\frac{6.022*10^{23} \ atoms \ K_2CrO_4}{1 \ mol \ K_2CrO_4}[/tex]
The moles of potassium chromate will cancel.
[tex]8.00 *\frac{6.022*10^{23} \ atoms \ K_2CrO_4}{1}[/tex]
The denominator of 1 can be ignored.
[tex]8.00 *(6.022 *10^{23} \ atoms \ K_2CrO_4)[/tex]
Multiply.
[tex]4.8176*10^{24} \ atoms \ K_2CrO_4[/tex]
The original measurement of moles (8.00) has 3 significant figures, so we must round our answer to 3 sig figs.
For the number we calculated, that is the hundredth place. The 7 in the thousandth place tells us to round the 1 up to a 2.
[tex]4.82 *10^{24} \ atoms \ K_2CrO_4[/tex]
There are about 4.82* 10²⁴ atoms of potassium chromate in 8.00 moles.
Which statement best describes the use of catalytic converters in automobiles?
They decrease the rate of the reactions that produce harmful gases.
They oxidize hydrocarbons to form less toxic gases.
They combine the larger hydrocarbon molecules with smaller ones.
They increase reaction temperature for cleaner burning.
Answer:
The statement that best describes the use of catalytic converters in automobiles is;
They oxidize hydrocarbons to form less toxic gases
Explanation:
Catalytic converters
A working engine produces some air pollutants which are made due to fuel not completely burnt in the engine, including unburnt gasoline (a hydrocarbon), nitrogen oxides, and carbon monoxide
Carbon monoxide is poisonous to breathe in if present in the air around us, and nitrogen oxides causes acid rain and smog, while hydrocarbon from the gasoline causes smog
The catalyst in the catalytic converters aids in the conversion of the harmful gases produced by the car engine into harmless gases such as the types of gases already existing in the atmosphere and therefore, can be released into the air
The catalysts in the catalytic converter work by either oxidizing some of the harmful gases such as the unburnt hydrocarbons, or by reducing the other harmful gases such as the nitrogen oxides.
Therefore, the statement that best describes the use of catalytic converters in automobiles is that they oxidize hydrocarbons to form less toxic gases
Answer:
b
Explanation:
got it right on test
Which is the most common type of precipitation?
hail
rain
sleet
snow
Answer:
rain I think
Explanation:
Precipitation mostly relies on the main source water, that is how snow hail, and other cool weather form are created. So rain I may be wrong.
,
Rain is the most common type of precipitation. Therefore, the correct option is option B among all the given options.
What is precipitation?Any liquid and frozen water which condenses in the atmosphere then falls to the ground is referred to as precipitation. Rain, sleet, as well as snow are only a few of its various manifestations. Precipitation is one of three main processes that make up the global water cycle, together with evaporation and condensation.
Water vapor in the clouds condenses into increasing-sized droplets of water, forming precipitation. The drips hit the ground when they are sufficiently hefty. The water droplets can freeze to produce ice if a cloud is colder, as it would be at higher elevations. Rain is the most common type of precipitation.
Therefore, the correct option is option B.
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According to the Bohr model of the atom, energy is emitted as light when electrons
O fall back down to a lower energy level
O jump up to a higher energy level
are absorbed into the nucleus
O are ejected from the nucleus
Answer:
After jumping to the higher energy level also called the excited state the excited electron would be in a less stable position, so it would quickly emit a photon to relax back to a lower, more stable energy level.
Fossils can be found all over the world, often in layered rock formations. To determine the age of the rock layers within an
area, geologists and paleontologists use a technique called radiometric dating. Determining the age of a rock layer allows
scientists to determine the age of the fossils within it.
Some of the more exciting fossil discoveries are of dinosaurs, which existed on Earth between 230 and 65 million years
ago. Examine this map e. Click the map to zoom in, and drag the magnifying glass for a closer look. The map shows
where prehistoric rocks formed during the Triassic, Jurassic, and Crustaceous time periods, the same periods when
dinosaurs walked on Earth. Based on the map, what is the closest location to you where dinosaurs are likely to have lived?
Answer: Western USA.
Answer:
the answer is the question itself
Explanation:
Lucy volunteers at an animal shelter, and she takes care of an orange tabby 1 point
cat and her kittens. Some of the kittens have orange markings, but some
have gray markings. What units of genetic material determine how living
things look?
Answer; the answer is variations
The unit of genetic material that determines how living things look is called variations, look below for more description.
What are genetic variations?Hereditary variety alludes to contrasts among the genomes of individuals from similar species. A genome is all the innate data — every one of the qualities — of a creature. Hereditary variety is the distinction in DNA successions between people inside a populace.
For example, the human genome contains somewhere close to twenty and 25 thousand qualities.
Find more information about Genetic variations here:
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Give three examples of convection. PLEASE I AM BEING TIMED!!!
24.Og sample of carbon contains how may moles?
Answer:
2 moles
Explanation:
1.9982182553889358 real number but round up to 2
HELP! I will mark you as Brainliest
How does the energy of a wave relate to the wave’s amplitude?
The more energy a wave has, the smaller the amplitude is. This is because they do not have a direct relationship.
The more energy a wave has, the larger the amplitude is. This is because they do not have a direct relationship.
The more energy a wave has, the smaller the amplitude is. This is because they have a direct relationship.
The more energy a wave has, the larger the amplitude is. This is because they have a direct relationship.
Answer:
They have direct relationship and larger wave energy.
Answer:
Its D on edge
Explanation:
i took the test
What do all volcanos emit?
Answer:
By far the most abundant volcanic gas is water vapor, which is harmless. However, significant amounts of carbon dioxide, sulfur dioxide, hydrogen sulfide and hydrogen halides can also be emitted from volcanoes.
Explain how to use the ATOMIC NUMBER and ATOMIC MASS, of any element to calculate the amount of neutrons located in the nucleus of a atom
Explanation:
Atomic Number :
It only explain number of protons and electrons in nuclous
Atomic Mass :
Atomic mass tell how much neutrons are present in atom.
Answer:
[tex]\underline{ \boxed{atomic \: number = atomic \: mass - neutron \: number}} \\ \underline{ \boxed{atomic \: mass = proton \: number + neutron \: number}} \\ \underline{ \boxed{neutron \: number = atomic \: mass - proton \: number}}[/tex]
Explanation:
[tex] \underline{ \boxed{1}} \\ ATOMIC \: NUMBER = (atomic \: mass \: number\: - neutron \: number \: )\\ (which \: is \: same \: as ) = \: \underline{ \boxed{proton \: number}}\\ \\ \underline{ \boxed{2}} \\ ATOMIC \: MASS = (proton \: number \: + neutron \:number) \\ (is \: same \: as ) = \: \underline{ \boxed{sum \: of \:atomic \: nuclear \: content}} \\ \\ \underline{ \boxed{3}} \\ neutrons = (atomic \: mass \: number - proton \: number) \\ [/tex]
What is the ratio of the lithium and the chlorine atoms in the compound? __________________
The diagram below shows the apparatus used to pass a current through copper
sulfate solution.
1 x
Positive electrode
Negative electrode
Copper sulfate solution
What is the name of component X in the diagram above?
point
Fuse
Switch
оооо
Ammeter
O Battery
i think the answer is b) i.e. Switch....
according to me ammeter and battery are already there...
A student noticed that the size of the hot pack becomes bigger when magnesium sulfate reacts with water. She thinks that more atoms are produced that make the hot pack grow bigger. Do you agree?
Answer:
No
Explanation:
In the hot pack, as the water reacts with the magnesium sulfate, the pack becomes bigger is not an indication that new atoms have been created or produced.
As with all chemical reactions, they all obey the law of conservation of matter which states that "in chemical reactions, matter is neither created nor destroyed but atoms simply recombine".
The reason why the hotpack becomes bigger is because the atoms gain more volume.
Plzzzz help I’ve been with this for like 2 hours Ik it’s sad my momma didn’t give me a brain
Answer:
12- cold air is more dense then hot
13- Make days warmer (sorry if thats wrong!! :)
Answer:
cold air is more dense then hot
Make days warmer
Explanation:
What is a sign that a person may be abusing drugs?
A a change in mood and behavior
B avoiding friends and family members
C a drop in grades and a loss of interest in activities
D all of the above
Answer:
answer is a because drugs do so to the person.
An element is a specific type of atom (true or false)
Answer:
True
Explanation:
An element is pure substance that conatin only one type of atom
Answer:
true
Explanation:
the element hydrogen is made from atom
What are the half-reactions for a galvanic cell with aluminum and gold
electrodes?
Answer:
A
Explanation:
In a galvanic cell, energy is produced by spontaneous chemical processes.
The cathode and anode of this cell will depend on the relative position of the two metals in the electrochemical series.
Aluminium is higher in the electrochemical series so aluminium will be the anode. Silver is lower in the electrochemical series so silver will be the cathode.
Recall that oxidation (electron loss) occurs at the anode while reduction (electron gain) occurs at the cathode.
The half-reactions for the galvanic cell with aluminum and gold electrodes is [tex]\mathbf{Al_{(s)}\to Al^{3+} _{(aq) } + 3e^- \ and \ Au^+_{(aq)} +e^- \to Au_{(s)}}[/tex]
Galvanic cells are electrochemical cells that generate electrical energy by the spontaneous activity in the oxidation-reduction (redox) reaction process.
The position of the metals if they are going to be at the cathode or at the anode relatively depends on the position with which they find themselves in the electrochemical series. The higher metal will be the anode and the lower metal in the electrochemical series will be the cathode.
Since aluminum is higher than gold on the electrochemical series, then:
Aluminum = anode (oxidation of aluminum from solid to aqueous state)Gold = cathode (reduction of gold from aqueous to solid-state)Therefore, the half-reactions for the galvanic cell with aluminum and gold electrodes is [tex]\mathbf{Al_{(s)}\to Al^{3+} _{(aq) } + 3e^- \ and \ Au^+_{(aq)} +e^- \to Au_{(s)}}[/tex]
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_____ are factors that are not tested and remain constant. A. Dependent variables B. Controlled variables C. Independent variables D. Constant variables
Answer:
B. Controlled variables
Explanation:
The Dependent sample t-test compares the mean score of measurements in one group to that of another other group. It mainly used when analyzing comparable sample units as it pairs repeatable observations within a time frame.
Controlled variables are factors that are not tested and remain constant. Some examples of controlled variables are temperature, pressure, volume etc
Please help due soon fill in the blanks will give brainliest
Answer:
Proton has positive charge (+) and located in nucleus
Electron has negative charge (-) and located in electron cloud
Neutron has neutral charge (0) and located in nucleus
If different atoms can come together to form living and nonliving things, why is there a limit to different combinations we encounter around the universe?
Explanation:
There is a limit to different things we encounter around the universe due to a lot of reasons.
Some combinations takes place under special conditions due to the activation energy barrier present.To overcome these barriers, some catalysts that are not readily available are needed. This reduces the combination of some atoms in nature.
Also, the right temperature and pressure conditions might not be present. For most reactions to occur, the right conditions must be made available by nature.This and many more reasons limits the combination of chemical substances.
There is a limit to different things we encounter around the universe due to a lot of reasons:
Some combinations takes place under special conditions due to the activation energy barrier present. To overcome these barriers, some catalysts that are not readily available are needed. This reduces the combination of some atoms in nature. Also, the right temperature and pressure conditions might not be present. For most reactions to occur, the right conditions must be made available by nature.So, for a chemical reaction to occur there are certain parameters that need to taken into consideration for a chemical reaction to actually takes place.
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A student noticed that the size of the hot pack becomes bigger when magnesium sulfate reacts with water. She thinks that more atoms are produced that make the hot pack grow bigger. Do you agree? Explain.
Answer:
Disagree with the suggestion based on the hygroscopic nature of anhydrous magnesium sulfate
Explanation:
Magnesium sulfate in the anhydrous form is a drying agent. A drying agent salts of inorganic compounds that has the capability of absorbing water to become hydrated, when placed in the presence of a wet surface or moist air
Anhydrous magnesium sulfate is therefore hygroscopic such that it absorbs water from the atmosphere and becomes hydrated and increases in size as its volume is increased according to the following chemical equation
MgSO₄(s) + 7H₂O(l) → MgSO₄·7H₂O(s)
The molar mass of anhydrous magnesium sulfate = 120.366 g/mol
The molar mass of the heptahydrate = 246.47 g/mol
Therefore, the mass of the magnesium sulfate doubles when it forms the heptahydrate, and the magnesium sulfate grows bigger.
Which ones are elements, compounds I’ll give brainliest.
2 H2 + O2 → 2 H20, how many moles of O2 are needed to yield 7.8 moles of
water?
Answer:
12 moles H2O
Explanation:
Your tools of choice for stoichiometry problems will always be the mole ratios that exist between the chemical species that take part in the reaction.
As you know, the stoichiometric coefficients attributed to each compound in the balanced chemical equation can be thought of as moles of reactants needed or moles of products formed in the reaction.
In your case, the balanced chemical equation for this synthesis reaction looks like this
2H2(g]+O 2(g]→2H2O(l]]
Notice that the reaction requires
2
moles of hydrogen gas and
1
mole of oxygen gas to produce
2
moles of water.
This tells you that the reaction produces twice as many moles of water as you have moles of oxygen gas that take part in the reaction.
You know that your reaction uses
6.0
moles of oxygen. Assuming that hydrogen gas is not a limiting reagent, you can say that the reaction will produce
6.0
moles O
2⋅2
moles H
2O1
moles O
2=
12 moles H2O
Choose the statements below that are correct regarding the nature of protons and neutrons. Choose ALL statements that are correct.
a. protons and neutrons are found around the outer edge of the atom
b. protons and neutrons have approximately the same charge
c. protons and neutrons are found in the nucleus
d. protons and neutrons have approximately the same mass
Answer:
c. protons and neutrons are found in the nucleus
d. protons and neutrons have approximately the same mass
Explanation:
There are three fundamental particles within an atom which are the protons, neutrons and electrons.
The protons are the positively charged particles within an atom
Neutrons do not carry any charges
Electrons are the negatively charged particles.
Both the protons and neutrons occupy the tiny nucleus at the center of the atom. The electrons moves round the nucleus through the orbital space. The mass of the protons and neutrons are similar and are assumed to be approximately the same.