Answer:
a state of matter created when particles, called bosons, are cooled to near absolute zero (-273.15 degrees Celsius, or -460 degrees Fahrenheit).
Explanation:
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Continued depletion of the ozone layer will most likely result in:.
Answer:
More radiation entering the earth's atmosphere.
Explanation:
The ozone layer is layer of O₃ (oxygen) and prevents most radiation from reaching earth.
How many moles of nh3 is needed to react with. 824 mol nh3
1.648 moles of ammonia will be required to produce 0.824 moles of nitrogen gas.
What are moles?Mole is a very important unit of measurement that chemists use. A mole of something means you have 602,214,076,000,000,000,000,000 of that thing, like how having a dozen eggs means you have twelve eggs.
According to the reaction, 1 mole of nitrogen gas is produced by 2 moles of ammonia.
Then, 0.824 moles of nitrogen gas will be produced by:
1.648 moles of ammonia will be required to produce 0.824 moles of nitrogen gas.
Hence, 1.648 moles of ammonia will be required to produce 0.824 moles of nitrogen gas.
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If you want to prepare 2.00 L of a 0.800 M NaNO_3 solution from a NaNO_3 stock solution that is 1.5 M in concentration, how many mL of the stock solution must you start with
1066.7 ml of the stock solution must start with, preparing 2.00 L of a 0.800 M NaNO3 solution.
What is volume?Volume is the space occupied by a three-dimensional object.
By the formula [tex]\rm M_1V_1= M_2V_2[/tex]
M1 is the initial molarity, 1.5 M
M2 is the final molarity, 0.800 M
V1 is the initial volume
V2 is the final volume, 2.00 L
Putting the values in the equation
[tex]\rm 1.5\;M \times V_1= 0.800\;M \times 2.00\;L\\\\V_1 = \dfrac{ 0.800\;M \times 2.00\;L}{1.5\;M} = 1066.7\;ml[/tex]
Thus, the initial volume is 1066.7 ml
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Which state or states of matter have fixed volume but not a fixed shape? (HELP FAST)
Answer:
liquid
Explanation:
A solid is defined as substance with a set volume and form. A liquid is defined as substance with a set volume but no fixed form. A gas is substance that does not have a definite volume or shape. Plasma, like a gas, has no set volume or shape.
The topics covered by the study of thermodynamics include:.
Answer:
a. energy changes during heating.
b. energy changes during chemical reactions.
c. color changes during chemical reactions.
d. Both (a) and (b)
Explanation:
The answer is D.Both (a) and (b)
HELP PLEASE I BEG OF YOU
Identify three different alloys in your home. Describe how each alloy is used and why the properties of the alloy make it suitable for that application.
Answer:
Iron - Nails, Utencils, Appliances
Copper - Wiring
Aluminiem - Roofing, Ducting
Consider this reaction: h2s hno3 right arrow. s no h2o reduction half-reaction: n 5 3e- right arrow. n 2 oxidation half-reaction: s-2 right arrow. s 2e- after balancing the chemical equation, what are the coefficients for these compounds? h2s hno3
The coefficients of H2S and HNO3 in the balanced reaction equation are 2 and 3 respectively.
Chemical reactionIn a chemical reaction, reactans interact in a unique way to form products. In this case, the unbalanced reaction equation is; H2S + HNO3-----> NO + H2O.
Since this reaction is redox and electrons are lost/gained in the process, the coefficients of H2S and HNO3 in the balanced reaction equation are 2 and 3 respectively.
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Answer:
Explanation:
1st: 3
2nd: 2
students mixed two liquids in a beaker and listed their observations
> Liquid 1 was colorless
> Liquid 2 was colorless
> The mixture of liquids 1 and 2 formed a colorless solution
> small, solid particles formed and fell to the bottom of the beaker
based on these observations, which statement contains the best evidence that a chemical reaction occurred?
A. There is a change in shape
B. there is a change in volume
C. the two liquid mix into a solution
D. the two liquids made a new substance
The two liquids made a new substance.
What is a physical and chemical change?A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity.
A chemical change occurs when some substances are transformed into different substances, with different nature and properties. In this case when both liquids are mixed a solid is formed. This is an example of a change of state of the liquids reactants to the solid product, which has properties and characteristics different from that of the initial liquids of the mixture which is called a chemical change.
Hence, option D is correct.
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2. A 2.5 mol SAMPLE OF OXYGEN GAS (O2) INCREASES TO 3.2 mol
FROM AN INITIAL PRESSURE OF 720 mmHg. THE VOLUME
CHANGES FROM 34 L TO 45 L, AND THE TEMPERATURE
INCREASES FROM 25°C TO 45°C, WHAT IS THE FINAL PRESSURE
OF THIS GAS?
696.32 mmHg is the final pressure of the gas.
What is an ideal gas equation?The ideal gas equation, pV = nRT, is an equation used to calculate either the pressure, volume, temperature or number of moles of a gas.
Given data:
[tex]P_1[/tex] = 720 mmHg
[tex]P_2[/tex] = ?
[tex]n_1[/tex] = 2.5 mol
[tex]n_2[/tex] = 3.2 mol
[tex]V_1[/tex] = 34 L
[tex]V_2[/tex] = 45 L
Formula
Combined gas law
[tex]\frac{P_1 V_1}{n_1} = \frac{P_2 V_2}{n_2}[/tex]
[tex]P_2[/tex] = 696.32 mmHg
Hence, 696.32 mmHg is the final pressure of the gas.
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MULTIPLE CHOICE QUESTION
Which of the following is an example of a
chemical change?
An iron nail forming rust
Tearing paper into many little pieces
Steam coming out from boiling water
Mixing sand with sugar
Dissolving coffee powder in hot water
Answer:
rust
Explanation:
Chemical rxn of iron and oxygen = rust
You were task to cook rice for your family's dinner. After few minutes, you noticed that steam is coming out from the cooking pot. What do you call that process?
A. Insulation
B. Convection
C. Conduction
D. Heat transfer
Answer:
Convection
Explanation:
Convection is steam and the condensation of vapor.
List all of the ions present in solution when the following strong
electrolyte compound is dissolved in water
Co3(PO4)2
Answer:
Co²⁺ and PO₄³⁻
Explanation:
Strong electrolytes completely dissolve in water. Therefore, the ionic bonds between the cation and anion in Co₃(PO₄)₂ would break apart. The resulting ions would be Co²⁺ and PO₄³⁻. The phosphate (PO₄³⁻) would NOT further seperate because the phorphorus and oxygen bonds are covalent, not ionic. Phosphate ions are a type of polyatomic ion (ions which have covalent bonds).
How to find hydrogen ion concentration from molarity of solution
The concentration of the hydrogen ions from molarity can be given with the number of hydrogen atoms in the molecular formula.
What is molarity?Molarity is given as the moles of the solute present in a liters of solution. The compound with the number of hydrogen atoms in the molecular formula with degradation possesses the equivalent concentration of the hydrogen ions.
The compound with molecular formula AH having molarity 2, will produce 2M of hydrogen ions.
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the outermost layer of earth's atmosphere is
Answer: Exosphere
Explanation:
Answer:
exosphere
Explanation:
the outermost layer of earth's atmosphere is called exosphere
Write the reaction for the weak base co32- in water
The weak base carbonate reacts with the water forming bicarbonate and the hydroxide ion.
What is a weak base?The weak bases are given as the compounds that have the inability to get completely dissociated in water.
The carbonate is given as the weak base, as in water it remains constituted in the form of a bond with oxygen.
The reaction of water with the carbonate ion is given as:
[tex]\rm CO_3^{2-}\;+\;H_2O\;\rightleftharpoons HCO_3^-\;+\;OH^-[/tex]
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In general, the rate of evaporation increases with ___________.
Answer:
heat increase, pressue loss, altitude gain,
Explanation:
Which of the following statements is correct?
Lithium is a metal, Titanium is a nonmetal
Magnesium and Helium are gases.
Copper and Argon conduct electricity,
Calcium is malleable, Sulfur is not malleable.
Answer:
The 4th statement. Because sulfur is not malleable.
Answer:
d
Explanation:
If 3. 5 grams of ni are reacted with excess oxygen to form nickel oxide unser standard state conditions, what is the entropy change for the reaction?
Entropy Change is the measure of the randomness of the thermodynamic system. The entropy change for the reaction is -49.3 J/K.
What is the change in entropy?Entropy change is the ratio of the heat transfer of the system to the absolute temperature of the system.
The entropy of nickel = 182.1 J/mol. K
The entropy of oxygen = 205.0 J/mol. K
The entropy of nickel oxide = 37.99 J/mol. K
Entropy change is calculated as:
[tex]\begin{aligned}\Delta \rm S &= 2(37.99)-2(182.1)-205\\\\&= 75.98 - 364.2 - 205\\\\&= -493.22 \end{aligned}[/tex]
Therefore, -49.3 J/K is the entropy change.
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under what conditions can calcium bromide conduct electricity
Approximately how long has a victim been dead if their body temperature is 13.5C degrees? 50-52hrs 47-48hrs 33-34hrs 35-36hr
4Fe + 3O2 → 2Fe2O3
Iron combines with oxygen to form rust. Given the chemical reaction, how many grams of iron(Fe) would produce 10 g of rust(Fe2O3)?(molar mass of iron= 55.85; molar mass of rust= 159.69g)
A) 6.99
B) 29.9
C) 69.9
D) 9.99
6.99 grams of iron (Fe) would produce 10 g of rust (Fe2O3) when iron combines with oxygen to form rust.
How to calculate mass?The mass of a substance can be calculated as follows:
According to this question, iron combines with oxygen to form rust as follows:
4Fe + 3O2 → 2Fe2O3
First, we convert the mass of rust to moles as follows:
moles of Fe2O3 = 10g/159.69 = 0.063moles
4 moles of Fe produces 2 moles of Fe2O30.063 moles of Fe2O3 will be produced by 0.125 moles of Fe.Next, convert moles of Fe to mass as follows:
mass of Fe = 0.125 × 55.85 = 6.99g
Therefore, 6.99 grams of iron (Fe) would produce 10 g of rust (Fe2O3) when iron combines with oxygen to form rust.
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How many molecules are in 22g of NaOh
Answer:
40
Explanation:
because NaOH makes 40 grams.
If 10 grams of potassium chlorate decompose to form potassium chloride and oxygen gas inside a 500 mL container at a temperature of 45 °C. what will the pressure be inside the container?
Answer:
10 atm
Explanation:
There's a lot to do here, but lets take it one step at a time. First, let's write a balanced equation for the decomposition of potassium chlorate into potassium chloride and oxgyen gas.
2 KClO3 → 2 KCl + 3 O2
Now let's find the moles of the KClO3 (molar mass 122.55 g/mol) that we have take 10 g/122.55 g/mol, grams will cancel and we are left with 0.0816 moles. lets divide that by two since we have a two in front of the KClO3 in the equation, and then multiply that number by 5 since it's the total moles of products, in summary, multiply by 5/2 to get 0.204 moles.
Now that we know the moles of our products, let's plug some stuff into the ideal gas law PV = nRT. We are looking for P so let's solve for that. P = (nRT)/V, now let's plug in our values. Make sure V is converted to liters so 0.5 L. And convert celcius to kelvin by adding 273
P = ((0.204 moles)(318 K)(0.08206 L atm mol^-1 K^-1))/0.5 L
A lot of units cancel, and we get about 10.65 atm, if you don't want the answer in atm, you can find a conversion equation. But let's round to sig figs for now, which will bring us to 10 atm.
The increase in boiling point from CH4, SiH4, GeH4 to SnH4 is caused by the increase in strength of which type of intermolecular force?
Methane (CH4) with the smallest atomic size, would have the lowest boiling point.
What is Boiling point ?It is the temperature at which the pressure exerted by the surroundings upon a liquid is equaled by the pressure exerted by the vapour of the liquid; under this condition, addition of heat results in the transformation of the liquid into its vapour without raising the temperature.
CH₄, SiH₄, GeH₄, SnH₄ are very similar. They are all in the same group and their molecular geometry is a tetrahedral.
They have covalent bonds. The key difference: The number of protons and electrons.
These are non-polar molecules, so there are no ionic bonds. There are no H bonded to a F, N or O, so there is no hydrogen bonds.
Dipole induced dipole forces (AKA London dispersion forces) dictate the boiling points of these atoms. It is the attraction between atoms that dictate how easily they can disperse.
The electrons in an atom are constantly moving due to their repulsion of each other. However, if one electron has moved and the other has not, it is temporarily charged.
The biggest molecule will have the highest boiling point. The more protons and electrons, the stronger the effect.
Therefore, Methane (CH4) with the smallest atomic size, would have the lowest boiling point.
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____________is not an effect of heat
a. Expansion
b. Change of state
c. Contraction
d. Chemical change
Answer:
c. contraction
Explanation:
Heating will cause substances to expand, or change their state (like solid to liquid) or it may be a chemical reaction.
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Answer:
See below
Explanation:
(NH4)2SO4 Molar weight (from periodic table)
(N =14 H4 = 4 ) * 2 = 36
S = 32 O4 = 64 TOTAL = 132 gm/mole
N % = ( 2*14) / 132 = 21.2% molar mass = 28 gm
H % = (2 *4) / 132 = 6% molar mass = 8 gm
S % = 32/132 = 24.2 % molar mass = 32 gm
O % = (64) / 132 = 48.5% molar mass = 64 gm
This next step is going to take some skill and some careful observation. the wave speed is associated with the movement of crests and troughs along the medium. faster waves will have crest s that move from the left side of the screen to the right side of the screen in less time; that is the crests move from left to right faster . set the animation to a low frequency (about 0.1 hz) and observe the wave speed. it might help to put your finger o r a pen cap on a crest and follow move your finger (or pen cap) from left to right along with the crest. then repeat for a high frequency (about 1.0 hz) . make the same observation of wave speed - the speed of the crest moving from let to right across the s creen. does this ten - fold increase in frequency - from about 0.1 hz to about 1.0 hz - have any noticeable and appreciable effect upon the wave speed? explain your answer and discuss your observations.
The speed of the wave increases as the frequency of the wave is increased from 0.1 Hz to 1.0 Hz.
What is the relationship between wave speed and frequency?The speed of a wave of a given wavelength is directly proportional to its frequency.
An increase in the frequency of a wave results in a proportional increase in the speed of the wave of the wavelength remains the same.
In the animation, as the frequency of the wave is increased from 0.1 Hz to 1.0 Hz, the speed of the wave is observed to increase as the time taken for the crests and troughs to move across the screen becomes smaller.
Therefore, the speed of the wave increases as the frequency of the wave is increased from 0.1 Hz to 1.0 Hz.
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Question 12:
How many grams of NaOH are present in 7.54 moles of NaOH. (The molar mass of NaOH is 39.997 grams/mol)
a. 0.19 grams of NaOH
b. 32.5 grams of NaOH
c. 5.30 grams of NaOH
d. 301.6 grams of NaOH
Alkanes contain the maximum possible amount of hydrogen, they are known as being __________. What one word completes the sentence?
Alkanes contain the maximum possible amount of hydrogen, they are known as being saturated hydrocarbon.
What is alkanes?The easiest category of hydrocarbons would be the alkanes. They exclusively possess hydrogen as well as carbon. So every hydrogen atom produces one link, while each carbon atom generates four.
What is hydrocarbon?When all of a hydrocarbon's carbon-carbon bonds possess single bonds, the hydrocarbon was said to have been saturated. A hydrocarbon would be an organic substance with only carbon as well as hydrogen as its components.
Therefore, alkanes contain the maximum possible amount of hydrogen, they are known as being saturated hydrocarbon.
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The definition of the acceleration states that an object accelerates when it
Answer: Acceleration and velocity
Explanation:
Newton's second law says that when a constant force acts on a massive body, it causes it to accelerate, i.e., to change its velocity, at a constant rate. In the simplest case, a force applied to an object at rest causes it to accelerate in the direction of the force.
Answer:
Moving with changing velocity
Explanation:
the resultant force acting on it is not zero
hence
