Answer:
millions
Explanation:
the 1 is seven decimbal places to the left (seven places left of zero), which is the millions place
What information is provided by the modern periodic table, which is based on the one that Mendeleev developed? Choose the two statements that
apply.
A. It lists all the physical properties of the elements.
B. It organizes the elements according to their properties.
C. It identifies the particles that make up the atom of each element.
D. It lists the number of protons in the atoms that make up each element.
E. It organizes both elements and compounds based on chemical properties.
Answer:
( essay ) a time when i got lost somewhere
Beer-law Plot Absorbance vs. Concentration
Answer:
Solve algebraically by setting the y equal to 0.892 = 0.355x + 0.058. Then subtract the 0.058 over then follow by dividing by 0.355. You will then get the x value equal to your concentration. The answer is 2.676.
Hope this helps!
Explanation:
On a hot day, you might cool off by sitting in the shade of a big tree, eating a cold popsicle, going into an air-conditioned building, or jumping into a cold lake. Which of these are examples of using technology?
Answer:
Air conditionded building
Explanation: Ice cream is processed food so techniacally it could be using technology but Air conditioning is a unit of metal and is built. Hope this is right!
1- What is temperature?
2- If you could see individual atoms, what happens to them when temperature increases?
In your own please :(
Answer:
the sum of average kinetic molecules of the body is called temperature..
10. What do you have to do to the coefficients of equation I below to get to equation II?
i. 2 SnO2 + 4 H2 2 Sn + 4 H2O
ii. SnO2 + 2 H2 Sn + 2 H2O
0-2
How many electrons moved to make the above
oxygen ion?
received 1 electron
gave 2 electrons away
gave 1 electron away
received 2 electrons
Answer:
received 2 electrons
Explanation:
Since a neutrally charged oxygen has 8 electrons (-) and 8 protons (+), an oxygen ion with a charge of -2 and would have 10 electrons.
please help only one question. will mark brainliest if solved
Lead is a toxic metal that affects the central nervous system. A Pb-contaminated water sample contains 0.0011 %Pb by mass. How much of the water (in mL) contains 160 mg of Pb? (Assume a density of 1.0 g/mL.)
In 145.45 grams of water there are 160mg of 0.0011% Pb.
Solution concentrationTo resolve this issue, it is necessary to use the concentration of solutions, which indicates the percentage amount of one solvent or solute in relation to the other.
In the case of the question, we have that Pb is at a concentration of 0.0011%, that is, for every 100 grams of water we have 0.0011 grams of Pb.
So, to calculate the amount of water that we have 160mg of Pb, we will make the following expression:
Pb H2O
[tex]\frac{0.0011g}{160\times 10^ {-3}g} =\frac{1g}{x}[/tex]
[tex]x = 145.45g[/tex]
So, in 145.45 grams of water there are 160mg of 0.0011% Pb.
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6. What pattern did you notice in valence electron configuration as you moved through
elements 3–18?
Answer:
The maximum number of valence electrons is 8
Explanation:
element 3 has 3 valence electrons. 7 has 5, and 10 has 8, as we increased the number of electrons in element 11, the number of valence electrons became 3, and the pattern went on, it cannot exceed 8.
The electron configuration of an atom depicts the arrangement of electrons scattered throughout the orbital shells and subshells.
What is period 3 group 18's electron configuration?According to the Periodic Table, P3- has the same electrical configuration as argon, the next Noble gas (Group 18) element, which is 2,8,8.The number of valence electrons in groups 1-2 and 13-18 increases by one from one element to the next across the periodic table's rows, or periods.Electron configurations include: Two trends or patterns should be obvious: For elements in the same Group, the number of valence shell electrons is constant. The number of valence electrons increases from left to right along a Periodic Table period.What substance has a three charge and 18 electrons?Looking at a periodic table or table of elements, we can see that phosphorus (symbol P) has an atomic number of 15.As a result, each atom has 15 protons. The alkali metals are composed of the chemical elements lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr).To Learn more About electron configuration, Refer:
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What is the height on human
Answer:
5 feet 6 inches is the optimal height for a human
A sample of ammonia has a mass of 18.2g. How many molecules are in this sample?
Answer:
1.8x10_24 moleclues
Explanation:
because you have to divide the numbers and then times them together
There are 31.1 grams (g) in 1 troy ounce (ozt). How many ozt of gold are extracted from 1 short ton of average Nevada ore
This problem is providing us with the mass equivalent to one troy ounce. Thus, the troy ounces of gold in one short ton of average Nevada ore is required and found to be the 0.103 otz according to the following dimensional analysis.
Dimensional analysisIn chemistry, a raft of problems do not always provide an equation in order to be solved yet dimensional analysis can be applied, so as to obtain the desired amount in the required units.
Thus, since this problem asks for try ounces in an average Nevada ore, which has 3.2 grams of gold per short ton of ore, one can solve the following setup in order to obtain the required answer in otz:
[tex]\frac{3.2gAu}{1short-ton}*1short-ton*\frac{1otz}{31.1g} \\[/tex]
Where the short tons are cancelled out as well as the grams, in order to obtain:
[tex]0.103 otz[/tex]
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Calculate the molality of a solution that contains 1.875 g of potassium chloride (KCl) in 175g water.
Which statement best defines visible light?(1 point)
A. a change in direction of light when it strikes an object
B. a type of atom found in energy
C. a distance between one part of a wave and another
D. a form of energy that allows people to see
what's up? i don't think D words it that well, but i would think it's D since none of the other answers make sense
Answer:
so you can give it
Explanation:
Round the following number to two signifacant figures.
275
Answer:
3 significant figures
Explanation:
Thus 2° C, converts to 275 K, which has 3 significant figures. Rounding Error When you do a long series of calculations, try to do them all in one set of operations.
Balance the following equation and express the rate in terms of the change in concentration with time for each substance: NO(g) O2(g) LaTeX: \longrightarrow N2O3 (g) When N2O3 is forming at 0.221 M/s, at what rate is NO decreasing
The balanced equation is:
4 NO(g) + O₂(g) ⇒ 2 N₂O₃(g)
The expression of the rate in terms of change in concentrations are:
[tex]v = \frac{-\Delta [NO]}{4\Delta t } = \frac{-\Delta [O_2]}{1\Delta t } = \frac{\Delta [N_2O_3]}{2\Delta t }[/tex]
When N₂O₃ is forming at 0.221 M/s, NO is disappearing at 0.442 M/s.
What is the reaction rate?The reaction rate is the speed at which a chemical reaction takes place, defined as proportional to the increase in the concentration of a product per unit time and to the decrease in the concentration of a reactant per unit time.
Step 1: Write the balanced equation.4 NO(g) + O₂(g) ⇒ 2 N₂O₃(g)
Step 2: Express the rate in terms of the change in concentration with time for each substance.We will need to consider the stoichiometric coefficient of each species.
[tex]v = \frac{-\Delta [NO]}{4\Delta t } = \frac{-\Delta [O_2]}{1\Delta t } = \frac{\Delta [N_2O_3]}{2\Delta t }[/tex]
Step 3: Given the rate of formation of N₂O₃ is 0.221 M/s, calculate the rate of disappearance of NO.The molar ratio of NO to N₂O₃ is 4:2.
[tex]\frac{0.221molN_2O3}{L.s} \times \frac{4molNO}{2molN_2O_3} = \frac{0.442 molNO}{L.s}[/tex]
The balanced equation is:
4 NO(g) + O₂(g) ⇒ 2 N₂O₃(g)
The expression of the rate in terms of change in concentrations are:
[tex]v = \frac{-\Delta [NO]}{4\Delta t } = \frac{-\Delta [O_2]}{1\Delta t } = \frac{\Delta [N_2O_3]}{2\Delta t }[/tex]
When N₂O₃ is forming at 0.221 M/s, NO is disappearing at 0.442 M/s.
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How many Joules are released to cool 250.0 grams of liquid water from 100°C to 0°C? The specific heat of water is 4.180 J/g.C.
Is this endothermic or exothermic?
[tex]\bold{\huge{\orange{\underline{ Solution}}}}[/tex]
[tex]\bold{\underline{ Given :- }}[/tex]
We have 250g of liquid water and it needs to be cool at temperature from 100° C to 0° CSpecific heat of water is 4.180J/g°C[tex]\bold{\underline{ To \: Find :- }}[/tex]
We have to find the total number of joules released.[tex]\bold{\underline{ Let's \:Begin:- }}[/tex]
We know that,
Amount of heat energy = mass * specific heat * change in temperature
That is,
[tex]\sf{\red{ Q = mcΔT }}[/tex]
Subsitute the required values in the above formula :-
[tex]\sf{ Q = 250 × 4.180 ×(0 - 100 )}[/tex]
[tex]\sf{ Q = 250 × 4.180 × - 100 }[/tex]
[tex]\sf{ Q = 250 × - 418}[/tex]
[tex]\sf{\pink{ Q = - 104,500 J }}[/tex]
Hence, 104,500 J of heat is released to cool 250 grams of liquid water from 100° C to 0° C.
[tex]\bold{\underline{ Now :- }}[/tex]
We have to tell whether the above process is endothermic or exothermic :-
Here, In the above process ΔT is negative and as a result of it Q is also negative that means above process is Exothermic
Exothermic process :- It is the process in which heat is evolved . Endothermic process :- It is the process in which heat is absorbed .Someone can help me please??
C to D
Explanation:
it rises faster between those two points
How many grams of magnesium bromide (MgBry) are in 5.38 x 1024 formula units
of the substance?
Answer:
is 5509.12
Explanation:
creo que es eso no se lo siento
NaCl + AgNO, = AgCl + NONO,
If you have 98 grams of sodium chloride, 47 grams of silver nitrate, and 59 grams of silver
chloride, then how many grams of sodium nitrate will you have?
145 grams
86 grams
18 grams
101 grams
Based on the mass ratio of reactants, 23.5 g of sodium nitrate is produced from the reactants.
What is mass ratio of a chemical reaction?The mass ratio of a reaction is the ratio of the masses of reactants wilhich combine to form products.
The mass of sodium nitrate is determined from the mass ratio.
The equation of the reaction gives the mass ratio as follows:
NaCl + AgNO3 ----> AgCl + NaNO3
Molar mass of NaCl = 58.5 g
Molar mass of AgNO3 = 170 g
Molar mass of AgCl = 143.5
Molar mass of NaNO3 = 85 g
There are 98 grams of sodium chloride, 47 grams of silver nitrate, therefore silver nitrate is the limiting reactant.
47 grams of silver nitrate will produce 85/170 × 47 = 23.5 g of sodium nitrate.
Therefore, 23.5 g of sodium nitrate is produced from the reactants.
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How much energy is needed for the reaction of 1.22 miles of H3BO3 with 5.67 moles of hydrogen?
_H2BO3 + _H2 _B2H6+_H2O
The heat of reaction is the quantity of heat absorbed or emitted in a reaction.
What is heat of reaction?The heat of reaction is the quantity of heat absorbed or emitted in a reaction. This question is incomplete hence the numerical value of the heat of reaction can not be determined.
However, the heat of reaction is determined from the mass of the reactants, the temperature change in the calorimeter and the number of moles of the limiting reactant.
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please help me with this
When a liquid freezes, its particles get ____. This could result from the pressure ____.
A.farther apart; decreasing/ B.closer together; decreasing/C.farther apart; increasing /D.closer together; increasing
Answer:
farther apart; increasing
Explanation:
The particles in a liquid are less tightly packed together so an increase in pressure makes the particles in a liquid get farther apart.
help! Homework due tomorrow
Please help I’m marking a branliest answer ☹️☹️☹️☹️☹️☹️
CO2(g)+CCl4(g)⇌2COCl2(g) .
Calculate ΔrG for this reaction at 125 ∘C under the following conditions.
PCO2= 0.100 bar
PCCl4= 0.160 bar
PCOCl2= 0.750 bar
The ΔG for the reaction shown is -11.76 kJ/mol.
What is equilibrium constant?The equilibrium constant is a value that shows the extent to which reactants are converted to products in a reaction. We have to first obtain the equilibrium constant as follows;
K = (0.750)^2/(0.160) (0.100) = 35
Now;
Using the formula;
ΔG = -RTlnK
ΔG = -(8.314 × 398 × ln 35)
ΔG = -11.76 kJ/mol
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The size (diameters) of five atoms are in the order R<T<W<Y. Y being largest, if each has an electron situated on
its circumference, neglecting other factors, which of the atoms will lose its elctron most reluctantly? A. R B. T
C. W D. X E. Y
The atom that has the smallest diameter will have the greatest electron attraction, so the electrons will be difficult to escape
So atom R will lose its electron most reluctantly
What is the mass of 750 atoms of Nitrogen?
750 x 14,0067 u = 10,505.025 g
Which of the following organisms do not produce uric acid as the excretory product?
Answer:
where are the following organisms
calculate Kf for t butyl alcohol and use the results to find the mean value of the Kf for t-butyl alcohol
It should be noted that to calculate Kf for t butyl alcohol, we need to calculate molality.
How to calculate KfYour information is incomplete as the figures are not given. Therefore, an overview will be given. To calculate Kf for t butyl alcohol, we need to calculate molality.
Molality will be calculated as:
= mass of solute / (molar mass of solute × mass of solvent)
For example, if the solution has a molality of 0.455 that freezes at 3.17 degrees Celsius, then Kf would be equal to 3.17 divided by 0.455 which is 6.96 degrees Celsius.
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