Answer:
3.53 g
Explanation:
To convert from atoms to moles, you need to know Avogadro's number. Avogadro's number (6.022 × 10²³) is how many atoms there are in one mole of a substance. Use this to convert.
(1.97 × 10²² atoms) ÷ (6.022 × 10²³ atoms/mol) = 0.0327 mol
Now that you have moles, use the molar mass to convert to grams.
(0.0327 mol) × (107.87 g/mol) = 3.53 g
The mass in grams of the sample of Ag to three significant figures is 3.53 grams
The formula for calculating the number of moles of a substance is expressed as shown below:
[tex]moles =\frac{Mass}{Molar mass}[/tex]
Given the following parameters
Molar mass = 107.87 g/mol.
number of atoms of the sample = 1.97 x 1022 atoms.
Get the number of moles of the substance:
Moles = 1.97 × 10²²/6.022 × 10²³ = 0.0327 mol
Get the required mass of the substance:
Mass = moles * molar mass
Mass = 0.0327 * 107.87
Mass = 3.53 grams
Hence the mass in grams of the sample of Ag to three significant figures is 3.53 grams
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The growth rate is the death rate minus the birth rate these change because birth rates and
death rates increase or decrease
O True
False
Question 3
1 pts
Answer:
Hey there!
False. The growth rate is actually the birth rate minus the death rates.
Let me know if this helps :)
A chef fills a 100 ml container with 76.5 g of cooking oil. What is the density of the oil? \
is oxygen gas an element or a compound?
The principal, Mrs. Integer tells Mrs. Apex to write down exactly what she is doing step by step. In the scientific method this is called ... a the conclusion. b the data. c the hypothesis d the observation e the procedure
Answer:
E. the procedure
Explanation:
In scientific experiments, several steps are taken in order to achieve a significant result. However, the steps involved when performing the experiment should be taken note of and written down in a very comprehensible manner. The written step by step process involved in an experiment is called the PROCEDURE.
A procedure should be a guide to performing the experiment by a new experimenter. It should include everything done during the experiment. In this case, Mrs. Integer is telling Mrs. Apex to write down all she is doing during the experiment in a step by step manner. In essence, the principal is simply asking her to write a PROCEDURE.
Why is it important to identify carefully the problem to be solved
Answer:
It's importance is the fact that you cannot solve s situation if you don't know it's problem.
Explanation:
Problem identification or identifying a problem by scientist I a major and a key step in solving a problem.
I mean, if you don't identify a problem, there is no way you can think about the solution not to talk of getting the solution.
So identification of a problem is infact one of the major step a scientist must take to solve a situation.
It's importance is the fact that you cannot solve s situation if you don't know it's problem.
A sample of neon effuses from a container in 38 s. The same amount of an unknown noble gas requires 77.5 s. What is the unknown gas?
Answer:
Krypton.
Explanation:
By Graham's Law:
Rate 1 / Rate 2 = sqrt M2 / sqrt M1
Molecular Mass for Neon is 20.18
so we have:
38 / 77.5 = sqrt 20.18 / sqrt x where x is the unkown gas.
sqrt x = 9.162
x = 83.94.
This gas is Krypton.
A sample of neon effuses from a container in 38 s. The same amount of an unknown noble gas requires 77.5 s. The unknown gas is krypton.
What is noble gas ?The noble gases are a group of chemical elements that share several characteristics. They are all monatomic, odorless, and colorless gases with relatively little chemical reactivity under normal conditions. Helium, neon, argon, krypton, xenon, and radioactive radon are the six types of noble gases that are found in nature.
Due to their filled valence shells (octets), which render them incredibly nonreactive, the noble gases (Group 18), which are found in the far right of the periodic table, were formerly known as the "inert gases."
Due to their fully filled outer electron shells and lack of propensity to react with other elements, noble gases which are most frequently found as monatomic gases rarely form compounds with other elements.
By Graham's Law ;
Rate 1 ÷ Rate 2 = sqrt M2 ÷ sqrt M1
The Molecular Mass for Neon is 20.18
Then,
38 ÷ 77.5 = sqrt 20.18 / sqrt x
where x is the unknown gas.
sqrt x = 9.162
x = 83.94.
This is Krypton gas.
Thus, The unknown gas is krypton which is noble gas.
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An infrared wave has a wavelength of 0.00005 m. What is this wavelength in
scientific notation?
A. 5.0 x 10-6 m
B. 5.0 x 10-5 m
C. 5.0 x 10-4 m
D. 5.0 x 10-3 m
Can someone please help me fast!!
Answer:
B. [tex] 5 \times {10}^{ - 5}\: m [/tex]
Explanation:
[tex]0.00005 \: m= 5 \times {10}^{ - 5} \: m \\ [/tex]
Which phase change absorbs energy? A. H2O (g) --> H2O (s) B. H2O (g) --> H2O (l) C. H2O (l) --> H2O (g) D. H2O (l) --> H2O (s)
Answer:
C. H2O (l) --> H2O (g)
Explanation:
Hello,
In this case, we need to remember that processes absorbing energy are those that have positive heat, it means, process that obtain energy from a certain source. In such a way, processes that need energy, in terms of phase chance are fusion, sublimation and evaporation, which are the change from solid to liquid, solid to gas and liquid to gas respectively. Therefore, for the given options, we can see that C. H2O (l) --> H2O (g) accounts for an evaporation process which actually absorbs energy.
Best regards.
WILL AWARD BRAILIEST Which of the following best describes the particles inside a propane tank and inside a glowing neon sign? A: The particles in both are charged. B: The particles of both fill up the entire space available to them. C: The particles in the propane tank take limited space and those in the glowing neon sign are uncharged. D: The particles in the propane tank are charged and those in the glowing neon sign fill up the entire space available.
Answer:
it is A as both are always charged
Explanation:
Answer: A the particle is always charged
Explanation:
The long-term and short-term carbon cycles are connected by the fact that some of the carbon contained in C6H12O6 (or other organic molecules) in plants is incorporated into sedimentary rocks or oil; carbon in sedimentary rock and oil is not immediately cycled back to the atmosphere.
a. True
b. False
Answer:
False
Explanation:
The carbon cycle is a process which involves the flow of carbon through all of living things and life forms on Earth. The carbon cycle span over two segments: long-term and short-term, allowing for regulation of atmospheric carbon dioxide.While the short term segment deals with Earth forms that are more 'fleeting' like water nd air, the long-term affects the rock which take centuries to process through completely.In the short-term reservoir, carbon is stored in the atmosphere, oceans and biosphere with the ocean containing the largest amount of carbon. The biggest player and regulator of atmospheric carbon however is the ocean, not the biosphere. It is what links the long-term segment reserves to the short-term because carbon dioxide is removed from the atmosphere and converted to fossil fuels and rocks which are components of the long-term reserves.I hope this explanation was clear and comprehensive.
A substance X is formed from an exhaustible natural resource . It is a black and thick liquid with an unpleasant smell .It is a mixture of 200 substances.Some of the products such as dyes,explosives,paints,perfumes etc. Are obtained using this resource.The substance X is
Answer:
crude oil
Explanation:
The substance X would be crude oil.
Crude oil is a non-renewable natural resource that is black and thick in appearance. It is a mixture of several products and these are often separated by a process known as fractional distillation.
Some of the products from the fractional distillation of crude oil include the premium motor spirit (petrol), automotive gas oil (diesel), kerosene, etc., and derivatives for the production of dyes, paints, perfumes, etc.
What kind of mixture is spaghetti and meatballs? A) Solute B) Suspension C) Heterogeneous D) Homogeneous
Answer: C
Explanation:
Spaghetti and meatballs are Heterogeneous mixture. A heterogeneous mixture is a mixture that is not uniform in composition throughout the mixture.
What are heterogeneous mixtures?A heterogeneous mixture is one in which the composition is not uniform throughout.Vegetable soup is a diverse concoction. A spoonful of soup contains varying amounts of various vegetables and other soup ingredients. Concrete, oil, lettuce, and trail mix (no cement).There are numerous mixtures all around us. Soils are made up of a wide range of substances, and their compositions vary depending on the sample taken.The following scoop may contain earthworms, but it may also contain dirt and grass. Another example of a heterogeneous mixture is smog.This cloudy pollutant buildup is a combination of water and pollutants from gasoline and plastics combustion, possibly mixed with nitrogen oxide derivatives and ozone.To learn more about heterogeneous mixtures, refer
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Question 2 (0 points)
A spinner is spun and a die is rolled. What is the probability
of spinning red with the spinner or rolling an odd number with the
die.
red
/yellow
blue
green
Answer:
The probability of spinning red with the spinner or rolling an odd number with the die is [tex]\dfrac{1}{8}[/tex]
Explanation:
Given that,
Total color in spinner = 4
Let the area of four parts is equal in the spinner.
We need to calculate the probability of spinning red
Using formula of probability
[tex]P(A) = \dfrac{Number\ of\ red\ color\ outcome}{Total\ number\ of\ colors\ in\ the\ spinner}[/tex]
Put the value into the formula
[tex]P(A)=\dfrac{1}{4}[/tex]
We need to calculate the probability of odd number of the die
Using formula of probability
[tex]P(B) = \dfrac{Number\ of\ odd\ digits\ outcome}{Total\ number\ of\ digits\ in\ the\ die}[/tex]
Put the value into the formula
[tex]P(B)=\dfrac{3}{6}[/tex]
[tex]P(B)=\dfrac{1}{2}[/tex]
We need to calculate the probability of spinning red with the spinner or rolling an odd number with the die
Using formula of probability of two events which is independent
[tex]P(A\ and\ B)=P(A)\times P(B)[/tex]
Put the value into the formula
[tex]P(A\ and\ B)=\dfrac{1}{4}\times\dfrac{1}{2}[/tex]
[tex]P(A\ and\ B)=\dfrac{1}{8}[/tex]
Hence, The probability of spinning red with the spinner or rolling an odd number with the die is [tex]\dfrac{1}{8}[/tex]
Bleach boils at 101°C. Isopropyl alcohol (rubbing alcohol) boils at 82.5°C. Vinegar boils at 100.6°C. Water boils at 100°C. A student has an unknown clear liquid. She wants to determine what it is, so she decides to boil the liquid and use the boiling point as a means of identification. The liquid starts boiling at 99°C. Based on the boiling points shown, which substance is it?
Answer:
most likely water
Explanation:
most likely it is water, however pressure plays a role, if you are at sea level the boiling point of water is 100°C but if you are on Mt. Everest it is 71°C, assuming she is slightly above sea level it is water.
Write a full chemical equation for the reactions between magnesium and sulfuric acid
Answer:
magnesium + hydrochloric acid → hydrogen gas + magnesium chloride
explanation:
the nitrogen in HNO3 is in the +5 oxidation state and is easily reduced. The reduction would result in the oxidation of the hydrogen gas, forming the water once again.The sulfur in H2SO4 is also in its highest oxidation state, +6.
Hope this helps :)
How much energy is transferred when 30.0
g of water is cooled from 25.0 °C to 12.7 °C.
Answer:
Heat transferred, Q = 1542.42 J
Explanation:
Given that,
Mass of water, m = 30 grams
Initial temperature, [tex]T_i=25^{\circ} C[/tex]
Final temperature, [tex]T_f=12.7^{\circ} C[/tex]
We need to find the energy transferred. The energy transferred is given by :
[tex]Q=mc\Delta T[/tex]
c is specific heat of water, c = 4.18 J/g °C
So,
[tex]Q=30\ g\times 4.18\ J/g-^{\circ} C\times (12.7-25)\ ^{\circ} C\\\\Q=-1542.42\ J[/tex]
So, 1542.42 J of energy is transferred.
Select the claim that correctly describes the surface tension of water and the ability of the water strider to walk on water if the pond temperature increases due to global warming.
A
Global warming would increase the surface tension of water, making it easier for water striders to walk on water.
B
Global warming would increase the surface tension of water, making it harder for water striders to walk on water.
C
Global warming would decrease the surface tension of water, making it easier for water striders to walk on water.
D
Global warming would decrease the surface tension of water, making it harder for water striders to walk on water.
Answer:
The correct option is;
D Global warming would decrease the surface tension of water, making it harder for water striders to walk on water
Explanation:
Global warming involves the heating of the ecosystems on Earth due to human activity, which results in rising temperatures
As the temperature of the water rises due to global warming the surface tension decreases due to the increasing ratio of the force of higher kinetic energy water molecule to inter-molecular cohesive forces pulling the water together, which tends to weaken the effect of the cohesive forces and thus reduce the surface tension
As the surface tension has been reduced, the water striders will find it difficult to walk on the water surface as the maximum weight the water surface can lift without shearing, due to surface tension is reduced.
please help, ive been putting 3 for the coefficient and 14 for the exponent but, it keeps saying it’s wrong. any help is appreciated.
Answer:
3 × 10¯¹⁰
Explanation:
9×10² ÷ 3×10¹²
The above expression can be evaluated as follow:
9×10² ÷ 3×10¹²
Recall:
3² = 9
3¹ = 3
Therefore,
9×10² ÷ 3×10¹² = 3²×10² ÷ 3¹×10¹²
Recall:
y^m ÷ y^n = y^(m – n)
Therefore,
3²×10² ÷ 3×10¹² = 3²¯¹ × 10²¯¹²
= 3¹ × 10¯¹⁰
Recall:
y¹ = y
Therefore,
3¹ × 10¯¹⁰ = 3 × 10¯¹⁰
Therefore,
9×10² ÷ 3×10¹² = 3 × 10¯¹⁰
Please I have no idea my teacher didn’t teach this
Answer:
B (40º c)
Explanation:
Rubidium being silvery-white and melting at 39 ºC. Which means 40º C is the closest.
?Where did the mass of the forest trees come from? What happens to that mass when the forest burns?
Answer:
Forests prevent desertification.
Explanation:
A straight piece of wire is coiled to form a spring. Is it a Chemical or ra physical change? explain by justifying your answer.
Answer:
Explanation:
It is a physical change. The reason is that when a straight piece of wire is coiled to form a spring, its chemical properties do not change. Only the physical property ( shape ) of the wire changes.
Hope this helps
plz mark as brainliest!!!!!!
Answer:
See below
Explanation:
If a piece of wire is coiled to form a spring, it is a physical change. This is because there is no change in it's bonds rather there is a change in its shape and figure. Also, Physical change is reversible such that the coiled piece of wire can be changed back to a straight piece of wire. But, A chemical change is irreversible.
So, This is a physical change.
Lamar has been running sprints tp prepare for his next football game. He has found that he can maintain his maximum speed for 45 yards. He's thinking of running in a 5 km race in a few months, but doesn't know if he can maintain his maximum speed for the entire 5 km. Can you help him determine how far he can?
Answer and Explanation:
Given that
Length of race = 5km
Maximum speed = 45 yards
Based on the above information,
We transform the yards to kilometer i.e.
1 km = 1093.613 yards
And,
x = 45 yards
So,
1093.613 × x = 45
x = 45 ÷ 1093.613
x = 0.0411480 km
Where
x = Maximum length for which the maximum speed demonstrated in kilometers is sustained.
So, we concluded that Lamor cannot go for the overall 5km as he maintained till 0.0411 km
Hydrogen reacts with oxygen to form a compound called: a. Oxidation b. Oxide c. Metal d. None of the above
Answer:
Hydrogen reacts with oxygen to form a compound called hydrogen peroxide so your answer is none of the above.
Explanation:
Hope it will help you :)
Answer:oxide
Explanation:
The reaction ofhydrogen and oxygen result on hydrgen peroxide which is a part is oxide
What is the formula for potassium iodite? How did you get it?
Answer:
KI
Explanation:
Chemical formulaI −Molar mass126.90447 g·mol−1Conjugate acidHydrogen iodideThe first mechanistic step in the direct reaction of an amine with a carboxylic acid to produce an amide is ________.
A) an acid-base reaction
B) nucleophilic attack on the carbonyl carbon
C) loss of H2O
D) loss of CO2
E) loss of N2
Answer:
The first step is - option A) an acid base reaction.
Explanation:
The direct reaction of a carboxylic acid with an amine to form an amide is expected to be difficult as it would deprotonate the carboxylic acid and make a nonreactive carboxylate.
The first step in this reaction would be an acid - base reaction as protonation of the carbonyl carbon, that involves the interchange of proton in between electric charge or neutral compound, it is also known as protonation or deprotonation. The acid base reaction is followed by the nucleophilic attack on the carbonyl carbon.
Thus, The first step is - option A) an acid base reaction.
Whenever you cant study when you have to , listen to this song
'Very very strongest one piece'
What is needed to burn the candle (reactant)?
Answer:
wax, candlewick, and oxygen
Explanation:
The burning of the candle is both a physical as well as a chemical change. The reactants are the substances or the raw materials that are required for a reaction to the process. In the process of burning a candle, the reactants are the fuel which includes wax and wick, and oxygen which is found in the air. The products found at the end of the reaction are carbon dioxide and water vapor.
What is a good example of ACCURACY and PRECISION? *
Answer:
Bow and arrow
Explanation:
A bow and arrow need accuracy to hit a target. It needs precision to hit the small target
What is 745000 millimeters converted to Megameters?
Answer:
0.000745 megameters is the answer please mark me as brainliest
Answer:
Instantly Convert Millimeters (mm) to Megameters (Mm) and Many More Length Conversions Online. Millimeters Conversion Charts. Many Other ...
Missing: 745000× | Must include: 745000
Do objects with large masses always have large
weights? Explain
Answer:
No
Explanation:
No, as sometimes objects with large masses are very light since they aren't dense.