Answer:
Explanation:
1a=group 1 elements(H,Li,Na,K....)
3b=group 3 elements (Sc,Y,La....)
7a=group 17 elements (F,Cl,Br,I....)
How many moles of xenon do 5.66 x 10^23 atoms equal
Answer:
0.94 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{5.66 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{5.66}{6.02} \\ = 0.940199...[/tex]
We have the final answer as
0.94 molesHope this helps you
What is the ion #for lodine (l)?
Answer:An iodide ion is the ion I−. Compounds with iodine in formal oxidation state −1 are called iodides. This page is for the iodide ion and its salts, not organo iodine compounds. In everyday life, iodide is most commonly encountered as a component of iodized salt, which many governments mandate.
brainliest pls
In an experiment, what responds to the change of the independent variable?
Answer:
Independent Variable
Explanation:
ASAP pleaseeeeeeeeeeeeeeeeeeeeeee and Thankyou
What are the states of matter in precipitation?
Thank you! Have a nice day!
There can be two, solid (Hail) and liquid (Water).
Answer:
liquid and solid
liquid- rain
solid- hail and snow
I don't know about gas; probably not.
Need help! Don’t understand
Battery
Lightbulb
Metal
paper
clips
Wood
Motal noodle
Wire
Why does the bulb light when the needle touches a paper clip?
point
1. convection cells are produced
2. vibrations set up wavelike disturbances
ОООО
3. a circuit is completed
4. a phase change occurs
Answer:
A circut is comepleted
Explanation:
The bulb light when the needle touches a paper clip because the circuit is completed.
What is circuit?An electronic circuit comprises of individual electronic components like resistors, diodes,transistors , capacitors,etc. which are connected to each other by means of wires through which electric current flows.It can also be referred to as an electronic circuit.
It usually comprises of at least one active component . The combination of wires and simple and complex components allows operations to be performed, amplification of signals, displacement of data and performing of computations.
There are three types of circuits , an analog circuit ,a digital circuit and a mixed circuit which is combination of digital and analog circuits , even semiconductors are used in circuits.
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How are S waves and surface waves similar?
Both arrive after P waves.
Both compress the ground.
Both travel through liquids.
Both produce minimal ground motion.
I will give out brainliest
Answer:
The answer to this question is A. Both arrive after P waves
Explanation:
Because since P waves always come first surface and S waves come after.
Do electrons have psrticle nature or wave nature?
Explanation:
they have wave nature
its correct answer
According to Le Chatelier’s principle, a system in chemical equilibrium responds to stress by shifting the equilibrium in a direction that
reduces the stress.
normalizes the stress.
increases the stress.
changes the stress.
Answer:
its A reduces stress :)))
Explanation:
According to Le Chatelier’s principle, a system in chemical equilibrium responds to stress by shifting the equilibrium in a direction that reduces the stress.
What is Le Chatelier’s principle ?Le Chatelier’s principle states that when a chemical equilibrium become imbalance by any change such as change in concentration, temperature, pressure etc. the system will reduces this stress by creating a new equilibrium state.
By this principle, when temperature increases for an endothermic system, forward reaction will takes place more since the temperature is absorbed there.
Similarly, when the concentration of any reactant increases, the reaction will turn to that direction in which that reactant is consumed more. If any loss the volume, then the equilibrium will shifts to that direction in which the that substance is produced.
Hence, the system will somehow manage the imbalance by reducing the stress occurred.
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I was named after the man that developed the periodic table.
Einsteinium
Moscovium
Mendelevium
Lawrencium
Answer: Mendelevium
Explanation:
if there are 365 grams of NaCl, how many grams of sodium are there?
Answer: Molar mass is the amount grams that one mole weighs.
Explanation: You need to find the molar mass of NaCl which is the same as the amu on the periodic table in grams. So it is 22.99(Na) + 35.45(Cl) = 58.44
You also know that for every mole of NaCl you have 1 mole of Na because every molecule of NaCl has 1 atom of Na.
Finally, using the periodic table, again, you see that the molar mass of Na is 22.99.
Then using stoichiometry, you can find the grams of sodium.
100(g NaCl) * 1 mol (NaCl)/58.44 g (NaCl) * 1 mol (Na)/ 1 mol (NaCl) * 22.99 (g of Na)/ 1 mol (Na)
which equals 39.339435 g of Na.
If you need to maintain significant figures the answer will be 40.
How much of the protein consumed by humans around the world is fish?
O5 percent
O 20 percent
O 40 percent
O 50 percent
In an ecosystem, 20 percent of the protein consumed by humans around the world is fish.
What is an ecosystem?An ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the ecosystem through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the ecosystem .Living organisms also influence the quantity of biomass which is present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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Pan of water sitting outside during a hot sunny day. The temperature of the water goes up. What type of heat transfer causes the temperature to go up?
Answer: Convection
Explanation:
I hope this helps :D
Answer:
Radiation
Explanation:
It said that was the answer on the test.
A pan of water is sitting outside during a hot sunny day. The temperature of the water goes up. What type of heat transfer caused the temperature to go up?
conduction
induction
Incorrect: convection
Correct: radiation
A loop of wire turns between two permanent magnets in a generator. What is
the effect of this motion?
OA. A current of electricity flows from one magnet to the other.
OB. Current stops flowing through the loop of wire.
OC. Mechanical energy transforms into electrical energy.
O
D. The permanent magnets quickly reverse poles, reversing the
current's direction.
Answer:
a current flows through the loop of wire.
Explanation: my answers were worded diffrently
A loop of wire turns between two permanent magnets in a generator and the effect of this motion is conversion of Mechanical energy transforms into electrical energy.
What is generator?Generator is a device which is used to convert mechanical energy to electrical energy.
In generator between the two poles of magnet a loop of wire rotate by the mechanical force which produces magnetic field which in turn convert into the electric field.
Hence, option (c) is correct.
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Which of the following are NOT possible electron configurations?
Releases energy in the form of ATP
Stores energy in glucose molecules.
Perfomed by producers
Perfomed by consumers.
Explanation:
Both (Photosynthesis and Cellular respiration)
Because
In Cellular respiration energy is released in the form of ATP and In plants glucose stored in the form of energy. Plants are producers. Animals are consumers.Therefore,
Both is correct✔
What are the three physical properties of a copper penny?
a. color, reactivity, density
b. color, mass, oxidation
c. color, reactivity, mass
d. color, mass, shape
What is the formula for volume of a rectangular solid?
1.)length x width x height
2.) 1/2 length x width x height
3.)1/2 base x height
4.) length x width
Answer:
1. length x width x height
Answer:
1st.
thats the one for u to choose
what are the materials made by chemists for use in washing clothes and cooking materials
Answer:
water
hehehehheehehhe
Is science logical please help meeeeeee
Answer:
It kind of is logical so my answer is yes
Which statement discribes a gas?
Answer:
There's no statement...
At extremely cold temperatures, processes stop. Which Law of Thermodynamics addresses this?
Answer:
The Second Law
Explanation:
Consider the balanced chemical
reaction below. When the reaction was
carried out, the calculated theoretical
yield for iron was 365 grams, but the
measured yield was 278 grams. What
is the percent yield?
Fe2O3 + 3C0 2Fe + 3C02
Explanation:
Percentage yield = (278/365) * 100% = 76.16%.
Answer:
[tex]\boxed {\boxed {\sf 76.2 \% }}[/tex]
Explanation:
A percent yield helps measure how successful or precise a reaction was. It is ratio of measured yield to theoretical yield as a percent. The formula is:
[tex]percent \ yield=\frac{actual \ yield}{theoretical \ yield } *100[/tex]
For this reaction, the measured/actual yield was 278 grams, while the theoretical yield was 365 grams.
[tex]actual = 278 \ g \\\theoretical= 365 \ g[/tex]
Substitute the values into the formula.
[tex]percent \ yield =\frac{278 \ g}{365 \ g} *100[/tex]
Divide first. The grams (g) will cancel out.
278 g/365 g= 278/365=0.7616438356[tex]percent \ yield =0.76164383561*100[/tex]
Multiply.
[tex]percent \ yield=76.1643835616[/tex]
The original measurements both had 3 significant figures, so we should round our percent yield to 3 sig figs. In this case, that is the tenths place.
The 6 in the tenth place tells us to round the 1 up to a 2.
[tex]percent \ yield \approx 76.2[/tex]
The percent yield is about 76.2 %
Which two options
are
examples of chemical changes?
HELPPPPPPPPPP:-( :-( :-( :-(
DETERMINE THE MASS NUMBER OF EACH OF THE ISOTOPES OF LITHIUM
Answer:
6u and 7u
Explanation:
no of neutrons in 1= 3
no of protons in 1=3
mass=3+3=6
same method applies to the 2nd one
I need help on either question you can answer. Thank you god bless
1.Atomic Number (Z) = Mass Number (A) - Number of Neutrons
neutrons = mass number-atomic number
Atomic mass Cl-37= 17
Mass number Cl-37=37
Neutrons = 37-17=20
2. Mass atom X = mass isotope 1 . % + mass isotope 2.%...
[tex]\tt atomic~mass~X=0.0224\times 88+0.7832\times 90+0.1944\times 91=90.1[/tex]
3. The energy in one photon can be formulated as
[tex]\large{\boxed{\bold{E\:=\:h\:.\:f}}}[/tex]
f = c / λ, so :
[tex]\tt E\approx f\approx \dfrac{1}{\lambda}[/tex]
Energy is directly proportional to frequency and inversely proportional to the wavelength
So, as the frequency of photon increases, the energy of photon increases
4. Based on answer number 3 :
A. The wavelength becomes longer, and the energy decreases
Which substance in this redox reaction is the oxidizing agent?
1. How much heat is required to heat 22 grams of Aluminum from 15 °C to 49° C
Answer:
670.956
Explanation:
You can use this equation to solve for heat :
Q = m * c * ΔT
Q represents the heat
m represents the mass in kilograms
c is the specific heat. For aluminum, it's 897
ΔT is the change in temperature, so, 49 - 15 which is 34
Plug in the numbers and you get this :
Q = 0.022 * 897 * 34
Q = 670.956 Joules
Which two options are examples of chemical changes? A. A white powder mixed with a clear, colorless liquid makes a solution that is also a clear, colorless liquid. B. When two clear, colorless liquids are mixed together, a white solid forms. O C. A shiny metal bar glows red and expands when heated. D. A white piece of paper turns black and gives off a smell when burned.
Answer: B. When two clear, colorless liquids are mixed together, a white solid forms.
D. A white piece of paper turns black and gives off a smell when burned.
Explanation:
A. A white powder mixed with a clear, colorless liquid makes a solution that is also a clear, colorless liquid. B. When two clear, colorless liquids are mixed together, a white solid forms. O C. A shiny metal bar glows red and expands when heated. D. A white piece of paper turns black and gives off a smell when burned.
When two clear, colorless liquids are mixed together, a white solid forms. A white piece of paper turns black and gives off a smell when burned. These two options are examples of chemical changes.
What is chemical change ?Chemical change, or, alternatively, chemical breakdown into two or more separate molecules, occurs when one material reacts with another to create a new substance. These processes are referred to as chemical reactions, and they are typically irreversible barring additional chemical reactions.
A chemical transformation is one in which one or more new compounds are created. Chemical reactions are another name for a chemical transformation. Examples include burning any stuff and iron rusting.
Chemical synthesis, or, alternatively, chemical breakdown into two or more separate molecules, occurs when one material reacts with another to create a new substance. These processes are referred to as chemical reactions, and they are typically irreversible barring additional chemical reactions.
Thus, option B and D are correct.
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