tides are caused by the gravitational force of the sun and the moon
what is used to observe things, like cells, that are too small to see with the naked eye.
Answer:
a microscope is used to see little things the naked eye can't
Se tiene una solución acuosa 2M de carbonato de potasio. Expresar su concentración en %p/v y Normalidad.
Answer:
Normalidad = 4N
%p/V = 27.6%
Explanation:
La solución 2M de carbonato de potasio contiene 2moles de carbonato por litro de solución. La normalidad son los equivalente de carbonato de potasio (2eq/mol) por litro de solución:
2moles * (2eq/mol) = 4eq / 1L = 4N
El porcentaje peso volumen es el peso de carbonato en gramos dividido en el volumen en mL por 100:
%p/V:
Masa K2CO3 -Masa molar: 138.205g/mol-
2moles * (138.205g/mol) = 276g K2CO3
Volumen:
1L * (1000mL/1L) = 1000mL
%p/V:
276g K2CO3 / 1000mL * 100
%p/V = 27.6%Which best describes a radioactive isotope?
Answer:
A radioactive isotope, also known as a radioisotope, radionuclide, or radioactive nuclide, is any of several species of the same chemical element with different masses whose nuclei are unstable and dissipate excess energy by spontaneously emitting radiation in the form of alpha, beta, and gamma rays.
Answer:
unstable
Explanation:
when electrical energy is converted into any other deform of energy, the total amount of energy
ano ang kahulugan ng sekswalidad?
ano ang naakit sa isang tao..at kung ano ang iyong kasarian ay
At the carnival, a baby was given a helium balloon whose
pressure equaled the atmospheric pressure at the carnival
which was 102.7 kPa. However, the baby wasn't paying
attention and the balloon floated away into the troposphere
where the atmospheric pressure is 97.8 kPa. What is the
positive difference between the pressure in the balloon and
the pressure of the troposphere in atm?
atm
Answer: 0.048 kPa
Explanation: no clue i just looked it up you’re welcome y’all:)
HNO3 + S --> H2SO4 + NO Now identify the element oxidized and the element reduced. Which element is oxidized? Which element is reduced? Which elements undergo no oxidation or reduction?
Answer: S is getting oxidized, N is getting reduced and O and H undergo no oxidation or reduction
Explanation:
The oxidation reaction is defined as the reaction in which a chemical species loses electrons in a chemical reaction. It occurs when oxidation number of a species increases.
A reduction reaction is defined as the reaction in which a chemical species gains electrons in a chemical reaction. It occurs when oxidation number of a species decreases.
For the given chemical reaction:
[tex]HNO_3+S\rightarrow H_2SO_4+NO[/tex]
On the reactant side:
Oxidation number of H = +1
Oxidation number of N = +5
Oxidation number of O = -2
Oxidation number of S = 0
On the product side:
Oxidation number of H = +1
Oxidation number of N = +2
Oxidation number of O = -2
Oxidation number of S = +6
As the oxidation number of S is increasing from 0 to +6. Thus, it is getting oxidized. Similarly, the oxidation number of N is decreasing from +5 to +2. Thus, it is getting reduced.
The oxidation numbers of O and H remain the same on both sides of the reaction. Thus, they are neither getting oxidized or reduced.
Hence, S is getting oxidized, N is getting reduced and O and H undergo no oxidation or reduction
The specific heat capacity of water is 4.186 J/g °C
Calculate the temperature change when 8000 J of heat is added to 3g of water.
Use the equation q=mcT
Answer:
Solution given:
specific heat capacity of water [c]4.186 J/g °C
temperature[∆T]=?
mass[m]=3g
heat[Q]=8000J
we have
Q=mc∆T
8000=3*4.186*∆T
∆T=8000/12.558
∆T=637.04°C
the temperature change is 637.04°C.
how many moles are in 54g of sliver
Answer:
0.50 mols Ag
Explanation:
Given the data, we have:
mass= 54g
molar mass of Silver (Ag): 107.8 g/mol
We want moles, we can convert grams > moles using the molar mass as a "bridge" between the 2.
[tex]54g * \frac{1 mol}{107.8 g}= 0.50 mols Ag[/tex]
Keeping an eye on the units, we'll see 54g get cancelled out by 107.8 g/mol and we'll be left with moles of Silver.
Si de una caja de gelatina de 30g, se obtiene 5 porciones. Cuantas cajas y cuantos gramos se requieren para preparar 100 porciones.? respuestas concretas por fis
Answer:
20 cajas - 600 gramos
Explanation:
Veamos los datos informados:
1 caja → 5 porciones
1 caja → 30 g
Si queremos preparar 100 porciones, indudablemente necesitamos:
100 porciones . 1 caja / 5porciones = 20 cajas
Finalmente ya sabemos que una caja tiene 30 g
Entonces, si tenemos 20 cajas . 30 g / 1 caja = 600 g
En conclusión:
Necesitamos una masa total de 600 gramos en 20 cajas
How is an alkoxide ion formed??
Which of the following is a redox reaction? (HELP ASAAAP)
A)
MgCO3 → MgO + CO2
B)
Mg(OH)2 + 2HCl → MgCl2 + H2O
C)
CuO + H2SO4 → CuSO4 + H2O
D)
3MnO2 + 4Al → 3Mn + 2Al2O3
Answer:
D
Explanation:
Al is a reducing agent because it removes Oxygen from another compound
Mno2 is an oxidizing agent
If you took 800mg of aspirin tablet at 12:00pm and another 800mg tablet at 2pm, how many milligrams of aspirin are still in your system at 3pm? Aspirin has a t1/2 of 1 hour.
Don't you dare put a link. I have a very specific set of skills >.>
(Chemistry is unfortunately not one of them though, so please help me ^-^)
Answer:
100mg are in your system at 3pm
Explanation:
Half-life is the time necessary to decrease the initial amount of a substance in the half.
At 12:00pm, the amount of aspirin is 800mg
As half-life is 1h,
at 1:00pm, the amount of aspirin is 800mg/2 = 400mg
At 2:00pm, 400mg/2 = 200mg
At 3:00pm, 200mg/2 =
100mg are in your system at 3pmTo draw a Lewis structure for a covalent compound, begin by calculating A, the available electrons, and N, the needed electrons. What is N for silicon tetrachloride, SiCl4?
Answer:
To draw a Lewis structure for a covalent compound, begin by calculating A, the available electrons, and N, the needed electrons.
What is N for silicon tetrachloride, SiCl4?
Explanation:
A covalent compound is formed by the mutual sharing of electrons between two atoms.
According to Lewis octet theory, every atom wants to attain eight electrons around it.
For the given molecule SiCl4
Silicon has four valence electrons.
To attain the nearest inert gas configuration it requires four more electrons.
Each chlorine atom shares an electron and thus silicon attains eight electrons in its valence shell.
The Chlorine atom has seven valence electrons.
To get eight electrons in its valence shell it needs one more electron.
That is shared by the silicon atom.
Thus both Si and Cl attain eight valence electrons by sharing electrons and for the covalent bond.
N value for Si is --- 4.
A the available electrons for Si is ---- 4.
The available electrons for Si 4 and the needed electrons are also 4. A covalent compound is formed by the equal sharing of electrons between two atoms.
A covalent compound is formed by the equal sharing of electrons between two atoms.
According to Lewis octet theory, every atom wants to attain eight electrons in the shell.
For the given molecule [tex]\bold {SiCl_4}[/tex]
Silicon has four valence electrons and Chlorine has 7 electrons in the valence shell. It requires four more electrons to attain the nearest inert gas configuration for silicon and one more electron for chlorine. Each chlorine atom shares an electron and thus silicon attains eight electrons in its valence shell.
Thus both Si and Cl attain eight valence electrons by sharing electrons and for the covalent bond.
Therefore, the available electrons for Si 4 and the needed electrons are also 4.
To know more about Lewis Structure,
https://brainly.com/question/20300458
What volume of O2 at STP is required to oxidize 8.0 L of NO at STP to NO2? What volume of NO2 is produced at STP?
The balanced equation of the reaction is:
[tex]O_2 + 2 NO[/tex] ⇒ [tex]2 NO_2[/tex]
Every gas occupied 24 L in one mole in r.t.p. according to the equation:
[tex]24 \times n = V[/tex]
8/24=0.333 mol
2 moles of NO makes 2 moles of [tex]NO_2\\[/tex] so
0.333*24=8L
Which of the following measurements contains 2 significant figures?
A 0.0240
С 0.0901
B 371
D 1.0x10
E 0.004
Help pleaseeee
you wish to make a potassium carbonate solution with a molar concentration of 0.25mol/dm³,but you only have 11.7g of potassium carbonate. what is the maximum volume of solution you can make?
Answer:
0.337 dm³
Explanation:
M(K2CO3) = 138.2 g/mol
1) 11.7 g * (1 mol/138.2 g) =0.08466 mol
2) 0.08466 mol * (1 dm³/0.25 mol) = 0.3386 dm³ ≈ 0.337 dm³
Complete the missing information in the reactions. Then, label each reaction as Alpha
(a) or Beta (B) decay.
14
0
N
9
Type: :
n:
p:
n:
p:
n:
P:
238
U
10. 92
234
Th
90
+
Type: :
n:
n:
p:
n:
p:
I
p:
0
32
11 15
P
Type: :
n:
n:
n:
p:
P:
P:
4
244
Pu
12 94
He
Type:
n:
n:
n:
p
p:
p:
Answer:
rtyuioroiytryu
Explanation:
Which statement about Niels Bohr’s atomic model is true?
Answer:
Each orbit has a specific energy level.
Would you mind marking it the brainliest:).
How many moles are in 3.90 x1030 atoms of Zn?
Which is the correctly balanced chemical equation for the reaction of KOH and H2SO4? Which is the net ionic equation for the reaction?
Answer:
See explanation
Explanation:
A balanced chemical reaction equation has the same number of atoms of each element on both sides of the reaction equation.
Hence, for the reaction between KOH and H2SO4, the balanced chemical reaction equation is;
H2SO4(aq) + 2KOH(aq) ---------> K2SO4(aq) + 2H2O(l)
Complete ionic equation;
2H^+(aq) + SO4^2-(aq) + 2K^+(aq) +2OH^-(aq) -------> SO4^2-(aq) + 2K^+(aq) + 2H2O(l)
Net ionic equation;
2H^+(aq) + 2OH^-(aq) -------> 2H2O(l)
QUICK PLEASE
What is the final concentration when 275 mL of 20.0 % W/V hydrogen peroxide solution is diluted to 1.000 L?
20.0 % W/V
0.30 % W/V
55.0 % W/V
5.50 % W/V
Answer:
20.0% w/v A
Explanation:
A 20.0 w/V...
How many molecules are in 0.0230 grams of C3H6?
What mass of methanol (CH3OH) is produced when 140.1 g of carbon
monoxide reacts with 12.12 g of hydrogen?
CO(g) + 2H2(g) → CH2OH()
A. 160.2g
B. 96.12 g
C. 6.06 g
D. 192.2g
Answer:
B. 96.12 g
Explanation:
To solve this question we must convert each reactant to moles. Using the balanced equation we can find limiting reactant. With moles of limiting reactant we can find the moles of methanol and its mass:
Moles CO -Molar mass: 28.01g/mol-
140.1g CO * (1mol / 28.01g) = 5.0 moles CO
Moles H2 -Molar mass: 2.01g/mol-
12.12g * (1mol / 2.01g) = 6.03 moles H2
For a complete reaction of 5.0 moles of CO are required:
5.0moles CO * (2mol H2 / 1mol CO) = 10.0 moles of H2 are required
As there are just 6.03 moles, H2 is limiting reactant.
The moles of methanol produced are:
6.03 moles H2 * (1mol CH3OH / 2mol H2) = 3.015 moles CH2OH
Mass CH3OH -Molar mass32.04g/mol-:
3.015 moles CH2OH * (32.04g/mol) =
96.6g CH3OH ≈ B. 96.12 g
When you perform a stoichiometry calculation, you are determining the ...
A) actual yield
B) theoretical yield
C) percent yield
Answer:
B) Theoretical
Explanation:
Just did the question
Lithium chloride + Iron → ?
Answer:
Lithium chloride + Iron
No reaction takes place, because lithium is more reactive than iron, so Iron cannot displace lithium from its solution.
Hope u understand
Please mark as brainliest
Thank You
An ion and its parent atom differ in....? 1) All of the options are correct 2) electron configuration. 3) chemical reactivity. 4) number of electrons.
HELPPP!!!
The emission of electromagnetic energy from an atomic nucleus is called_______
decay.
Gamma decay, type of radioactivity in which some unstable atomic nuclei dissipate excess energy by a spontaneous electromagnetic process. In the most common form of gamma decay, known as gamma emission, gamma rays (photons, or packets of electromagnetic energy, of extremely short wavelength) are radiated.
Can you please help me with this?
What happens with the evaporation of raindrops in the atmosphere?
Answer:
they become water vapor and after that, they become a type of precipitation
what makes a compound a pure substance
Answer:
Compounds contain more than one type of material. Yet both compounds and elements are considered pure substances.
Pure compounds are created when elements combine permanently, forming one substance
Extra:
So, a mixture can be separated into its original components, while a pure compound cannot.