Hi can anyone help me ?
Answer:
its 4
Explanation:
. The following describes some reactions that started with magnesium metal:
Calcium was heated in air to form a substance G G was added to a beaker of water to form
substance L. This substance L was then added to dilute sulphuric acid to form M and a liquid B.
a) Identify the substances labelled G, L, M and B
(2 Marks)
G
L
M
B
Answer:
This is an exothermic reaction. An exothermic reaction is a term that describes a chemical reaction in which there is a net release of energy (heat). Magnesium is also capable of reducing water to the highly-flammable hydrogen gas, which will be ignited by the excess heat given by the reduction reaction.
Explanation:
what will happen when the rates of evaporation and condensation are equal
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Que es la materia y qué es el volumen que ocupa la materia?
Todo en un estado sólido de materia tiene una forma y una longitud distintas. El volumen de un objeto es la cantidad de espacio que ocupa. Un sólido es un bloque de madera que conserva su forma y volumen cuando se coloca sobre una mesa.
Hope that helps!!!
¡Espero que ayude!
How to search icse board books by name and their solution
Answer:
i really don't know
Explanation:
but if you got an answer please let me know ty:)
Que nombre recibe la división del sistema nervioso que se encarga de la acciones y los procesos involuntarios del cuerpo
Answer:
Sistema Nervioso Autónomo
Explanation:
El Sistema Nervioso es el encargado de enviar señales (impulsos nerviosos en su mayoría) a órganos y partes del cuerpo, para que ejerzan su función. En general, se compone de 3 divisiones o subsistemas:
Sistema Nervioso Central (cerebro y encéfalo)Sistema Nervioso Perisférico (nervios y ganglios)Sistema Nervioso Autónomo (impulsos involuntarios)De éstos, el encargado de acciones y procesos involuntarios es el Sistema Nervioso Autónomo (SNA), que a su vez se divide en simpático y parasimpático. El SNA se encarga de los movimientos involuntarios de órganos, como el corazón, el sistema digestivo, etc., y de regular procesos como la secreción de hormonas y la regulación de la temperatura corporal.
What is the mass of 1.72 moles of sodium nitrate? Use the periodic table and the polyatomic ion resource.
Answer:
[tex]\boxed {\boxed {\sf 146 \ g \ NaNO_3}}[/tex]
Explanation:
To convert from moles to mass, the molar mass is used. This tells us the grams in 1 mole of a substance.
1. Write FormulaWe know the compound is sodium nitrate.
Sodium: NaNitrate: NO₃Sodium has an oxidation state of +1 and nitrate's is -1. When they bond, sodium gives an electron to nitrate and the charges balance out. We don't need to add any additional subscripts.
Sodium nitrate: NaNO₃2. Calculate Molar MassThe molar mass is found on the Periodic Table. It is the same as the atomic mass, but the units are grams per mole. Look up the values for the individual elements.
Na: 22.9897693 g/mol N: 14.007 g/mol O: 15.999 g/molNotice that in the formula, oxygen has a subscript of 3. We must multiply oxygen's molar mass by 3 before adding the other molar masses.
O₃: 3(15.999 g/mol)= 47.997 g/molNaNO₃= 22.9897693+14.007+ 47.997 = 84.9937693 g/mol3. Calculate MassUse the molar mass as a ratio.
[tex]\frac {84.9937693 \ g \ NaNO_3}{1 \ mol \ NaNO_3}[/tex]
Multiply by the given number of moles: 1.72
[tex]1.72 \ mol \ NaNO_3 *\frac {84.9937693 \ g \ NaNO_3}{1 \ mol \ NaNO_3}[/tex]
The units of moles of sodium nitrate cancel.
[tex]1.72*\frac {84.9937693 \ g \ NaNO_3}{1}[/tex]
[tex]146.1892832 \ g \ NaNO_3[/tex]
4. RoundThe original measurement of moles has 3 significant figures, so our answer must have the same. For the number we found, that is the ones place.
146.1892832The 1 in the tenths place tells us to leave the 6.
[tex]146 \ g \ NaNO_3[/tex]
1.72 moles of sodium nitrate has a mass of approximately 146 grams.
while many microorganisms are harmful there are some that perform an important function. what is one example of suck a microorganisms
Answer:
Yeast
that helps in fermentation
Graphene is made of pure _______________.
Answer:
Graphene is made of pure carbon.
Explanation:
It is a material in which the carbon atoms are arranged in a single layer, creating a honeycomb pattern. It should be stressed that this layer of carbon is only one atom thick, although some authors consider up to ten layers of carbon to be graphene.
please mark me brainliest
what factors contributed to the increase of in the human population?
(I found this meme on Pinterest)
So what if when we get reincarnated on our tomb stone should we really write R.I.P or B.R.B?
lol don't report me my I asked my TEACHER this and she is wondering the same thing so this does effect me academically.
Question 5 How many grams of Hydrogen will be created from 5 moles of Aluminum? 2 Al + 3 H2SO4 – Al2(SO4)3 + 3H2
Answer:
Solution given:
2 Al + 3 H2SO4 – Al2(SO4)3 + 3H2
2mole +3mole. --- 1 mole + 3 mole
27×2g. +3×98g-------- 342,g. + 6g
we have
2 mole of Al gives. 6g of h2
5 moles of Al gives 6/2×5=15g of hydrogen
15 g is your answer
Which two moon phases can occur while the
relative positions of the sun, Earth, and moon
form a straight line?
Answer:
its the lunar and solar eclipse
Explanation:
the solar eclipse happens when the moon is in between the sun and earth
What is the pH of a solution with a 3.2 x 10−6 M hydronium ion concentration?
Answer:
5.49Explanation:
The pH of a solution can be found by using the formula
[tex]pH = - log ([ { H_3O}^{+}])[/tex]
H3O+ is the hydronium ion
From the question we have
[tex]pH = - log(3.2 \times {10}^{ - 6} ) \\ = 5.49485..[/tex]
We have the final answer as
5.49Hope this helps you
Cuál es la importancia de una fórmula química y explique las clases de fórmulas con sus ejemplos respectivos.
Answer and Explanation:
Las fórmulas químicas sirven para conocer qué elementos químicos y en qué cantidad están presentes en un compuesto químico. Por ejemplo: la fórmula química del dióxido de carbono es CO₂. Esta fórmula nos indica que la molécula de dióxido de carbono está formada por 1 átomo del elemento químico carbono y 2 átomos del elemento oxígeno.
Los diferentes tipos de fórmulas químicas son: fórmula empírica, fórmula molecular, fórmula semi-desarrollada y fórmula desarrollada. Tomando como ejemplo al compuesto butano:
- Fórmula empírica: C₂H₅ (indica que hay 2 átomos de C por cada 5 átomos de H; es una fórmula mínima)
- Fórmula molecular: C₄H₁₀ (indica que en realidad cada molécula de butano tiene 4 átomos de C y 10 átomos de H).
- Fórmula semi-desarrollada: CH₃CH₂CH₂CH₃ (indica el órden en que se unen los átomos en la molécula).
-Fórmula desarrollada: ver dibujo adjunto (indica cómo están unidos los átomos dentro de la molécula. Ahora vemos los enlaces entre los átomos y que los 2 átomos de C de los extremos están unidos a 3 átomos de H y a otro C, y los dos átomos de C del medio están unidos cada uno a 2 C y 2 H).
I don't know how to get the volume and it is 10 point removed for it wrong so can someone help me
A(n)
Is the explanation of phenomena through the use of several Investigations or a scientific method.
O hypothesis
O scientific theory
O scientific law
The anion sbf4− does not obey the octet rule. draw its lewis structure and state the type of octet-rule exception. indicate the values of nonzero formal charges and include lone pair electrons.
Answer:
SEE EXPLANATION
Explanation:
The ion SbF4^- is octahedral in shape. In this compound, Sb which is the central atom in SbF4^- has an expanded octet. This means that it has more than eight electrons in its outermost shell thereby violating the octet rule. Hence the type of violation to the octet rule shown by the compound is expanded octet.
The Sb central atom has a formal charge of -1 as shown in the image attached to this answer.
helpppppppppppppppppppppppppp
find the average speed of a person who swims 105 m in 70 s
Answer:
v = 1.5 m/s
Explanation:
Given that,
Distance covered by a person, d = 105 m
Time taken, t = 70 s
We need to find the average speed of the person. We know that the average speed is given by :
[tex]v=\dfrac{d}{t}\\\\v=\dfrac{105\ m}{70\ s}\\\\v=1.5\ m/s[/tex]
So, the average speed of the person is equal to 1.5 m/s.
list five physical properties of water
Answer:
The main properties of water are its polarity, cohesion, adhesion, surface tension, high specific heat, and evaporative cooling.
Explanation:
Boiling Point and Freezing Point.
Surface Tension, Heat of Vaporization, and Vapor Pressure.
Viscosity and Cohesion.
Solid State.
Liquid State.
Gas State.
Raj is trying to make a diagram to show what he has learned about nuclear fusion.
1 H e atom plus Energy right arrow 2 H atoms plus Heat plus Pressure.
Is his diagram correct, and if not, how could he fix it?
Yes, he should leave it as is because one atom of He plus energy results in two atoms of H and heat and pressure.
No, he should place energy on the right and heat and pressure on the left.
No, he should place the He atom and energy on the right, and the H atoms and heat and pressure on the left.
No, he should place the He atom on the right and the H atoms on the left.
Answer:
hope it helps make brainlliest ty
Answer:
C: No, he should place the He atom and energy on the right, and the H atoms and heat and pressure on the left.
Explanation:
A gas occupies 450. mL 3 atm. If its volume decreases to 0.200 L then what will its new pressure be?
Assume constant temperature and mass.
Show your work.
Answer:
6.75 sym.
Explanation:
Boyle's Law: The pressure of a gas in an enclosed container with a flexible volume is inversely proportional to the volume occupied by the gas.
Empirically => P ∝ 1/V => P = k(1/V) => k = P·V
For any conditions of Pressure & Volume, Pressure x Volume is a constant.
Therefore, k₁ = k₂ => P₁V₁ = P₂V₂ => V₂ = P₁V₁ / V₂
=> V₂ = (3atm)(0.450L)/(0.200L) = 6.75 atm.
A partir de 140 g de n2 y una cantidad de h2 se obtuvo 153G de NH³. Cual es el % de rendimiento de la reacción química
Respuesta:
90.0 %
Explicación:
Paso 1: Escribir la ecuación química balanceada
N₂ + 3 H₂ ⇒ 2 NH₃
Paso 2: Calcular el rendimiento teórico de NH₃ a partir de 140 g de N₂
En la ecuación balanceada, participan de N₂: 1 mol × 28.01 g/mol = 28.01 g y de NH₃: 2 mol × 17.03 g/mol = 34.06 g.
140 g N₂ × 34.06 g NH₃ /28.01 g N₂ = 170 g NH₃
Paso 3: Calcular el rendimiento porcentual de NH₃
El rendimiento experimental de NH₃ es 153 g. Podemos calcular el rendimiento porcentual usando la siguiente fórmula.
R% = rendimiento experimental / rendimiento teórico × 100%
R% = 153 g / 170 g × 100% = 90.0 %
If a substance has a half life of 58 years and starts with 500 g radioactive, how much remains radioactive after 30 years?
Answer:
A = 349 g.
Explanation:
Hello there!
In this case, since the radioactive decay kinetic model is based on the first-order kinetics whose integrated rate law is:
[tex]A=Ao*exp(-kt)[/tex]
We can firstly calculate the rate constant given the half-life as shown below:
[tex]k=\frac{ln(2)}{t_{1/2}} =\frac{ln(2)}{58year}=0.012year^{-1}[/tex]
Therefore, we can next plug in the rate constant, elapsed time and initial mass of the radioactive to obtain:
[tex]A=500g*exp(-0.012year^{-1} *30year)\\\\A=349g[/tex]
Regards!
how many grams are 7x10^22 molecules of NaOH
Answer:
you probably not Finn look at this from 1 week
Explanation:
sooo ug
Which 2 minerals can be scratched by a Diamond but NOT Quartz
Answer:
topaz and corundum
Explanation:
i know things
What number should be in front of O2 to balance the equation?
Answer:
There are now two oxygen atoms on the left and four on the right (in one N2O and three H2O's), so we balance the oxygen atoms by placing a 2 in front of the O2.
The numbers before atoms are the coefficients, and they are used to balance chemical reacions. In the provided example, number in front of O₂ is 3.
Note: Since I do not have the proposed reaction, I provided a random example.
What is a balanced chemical reaction?A balanced chemical reaction is an equation in which the number and type of atoms are the same on both sides of the arrows.
Following the law of mass conservation, chemical equations should be balanced to ensure that all the reactants appear in the products.
This means that no new atoms appear, and no atoms disappear. The only thing that changes in a chemical reaction is the bond between atoms.
So each side of the equation must be equilibrated concerning the amount and type of atoms.
Coefficients are used to balance reactions. These numbers are located before each atom and indicate the number of units present in the formula.
I do not have the proposed reaction, but I will provide an example using O₂.
4Al + _3_O₂ → 2 Al₂O₃Reactants ⇒ 4 Al and 3 O₂
3 O₂ = 6 O
Products ⇒ 2 Al₂O₃
2 Al₂ = 4 Al
2 O₃ = 6 O
On each side of the equation we have 4 Al and 6 O. The only thing that changes are the bonds between atoms.
In this case, the coefficient of O₂ is 3.
You can learn more about balanced chemical reactions at
https://brainly.com/question/26196894
https://brainly.com/question/15178192
#SPJ2
what's the word equation for table salt?
Answer:
Have Nice Day
Explanation:
2NaCI is the answer
What volume of 1.50 M KBr is fromed ,using 15.6 mL of concentrated KBr with a molarity of 9.65 M?
Answer:
100.4mL
Explanation:
Using the following formula:
C1V1 = C2V2
Where;
C1 = initial concentration (M)
C2 = final concentration (M)
V1 = initial volume (mL)
V2 = final volume (mL)
According to the information in this question,
C1 = 1.50M
V1 = ?
C2 = 9.65 M
V2 = 15.6 mL
Using C1V1 = C2V2
V1 = C2V2/C1
V1 = (9.65 × 15.6) ÷ 1.5
V1 = 150.54 ÷ 1.5
V1 = 100.36 mL
Approximately, V1 = 100.4mL