Mendeleev arranged the elements in the periodic table on the basis of atomic masses and stated the behavior of the elements in a periodic law. The periodic law is when elements arranged by the atomic masses they exhibit the presence of similar properties. Mendeleev focused on the chemical properties of the elements and Meyer focused on the physical properties of the elements. The change in the periodic table is that the elements are now arranged in the order of their atomic numbers instead of their atomic masses.
the formula equation of Acetylene + oxygen ----> carbon dioxide + water
Answer:
The final balanced equation is : 2C2H2+5O2→4CO2+2H2O.
living things are classified into groups based on similar characteristics which of the following best represents how plants are classified
A. vertebrates and invertebrates
B.Vascular and nonvascular
C. Angiosperms and Gymnosperms
D.Producer, Consumer, and Decomposer
Pretty sure the answer is D.
What is the formula mass of the fictitious compound: AB2?
HELP ME ASAPPP plsss
A copper coin with a mass of 6.30 grams changes temperature in the sunshine from 20.0°C to 32.0°C. How much energy is transferred? The specific heat capacity of copper is 0.377 joules/gram degree Celsius. Express your answer to three significant figures.
The amount of energy transferred to the coin is
joules.
Answer:
q = mC∆T
q = heat = ?
m = mass = 6.30 g
C = specific heat = 0.385 J/g/deg
∆T = change in temperature = 32-20 = 12º
q = ((6.30 g)(0.385 J/g/deg)(12 deg) = 29.1 J (to 3 significant figures)
Explanation:
What is the molarity of an aqueous solution that contains 78g of C6H12O6 dissolved in 2500 mL of solution?
Answer:
[tex]\boxed {\boxed {\sf molarity = 0.17 \ M \ C_6H_12O_6}}[/tex]
Explanation:
Molarity is found by dividing the moles of solute by liters of solution.
[tex]molarity = \frac {moles}{liters}[/tex]
We are given grams of a compound and milliliters of solution, so we must make 2 conversions.
1. Gram to Moles
We must use the molar mass. First, use the Periodic Table to find the molar masses of the individual elements.
C: 12.011 g/mol H: 1.008 g/mol O: 15.999 g/molNext, look at the formula and note the subscripts. This tells us the number of atoms in 1 molecule. We multiply the molar mass of each element by its subscript.
6(12.011)+12(1.008)+6(15.999)=180.156 g/mol
Use this number as a ratio.
[tex]\frac {180.156 \ g\ C_6H_12 O_6}{ 1 \ mol \ C_6H_12O_6}[/tex]
Multiply by the given number of grams.
[tex]78 \ g \ C_6H_12O_6 *\frac {180.156 \ g\ C_6H_12 O_6}{ 1 \ mol \ C_6H_12O_6}[/tex]
Flip the fraction and divide.
[tex]78 \ g \ C_6H_12O_6 *\frac { 1 \ mol \ C_6H_12O_6}{180.156 \ g\ C_6H_12 O_6}[/tex]
[tex]\frac { 78 \ mol \ C_6H_12O_6}{180.156 }= 0.432958102977 \ mol \ C_6H_12O_6[/tex]
2. Milliliters to Liters
There are 1000 milliliters in 1 liter.
[tex]\frac {1 \ L }{ 1000 \ mL}[/tex]
Multiply by 2500 mL.
[tex]2500 \ mL* \frac {1 \ L }{ 1000 \ mL}[/tex]
[tex]2500 * \frac {1 \ L }{ 1000 }= 2.5 \ L[/tex]
3. Calculate Molarity
Finally, divide the moles by the liters.
[tex]molarity = \frac {0.432958102977 \ mol \ C_6H_12O_6}{ 2.5 \ L}[/tex]
[tex]molarity = 0.173183241191 \ mol \ C_6H_12O_6/L[/tex]
The original measurement has 2 significant figures, so our answer must have the same. That is the hundredth place and the 3 tells us to leave the 7.
[tex]molarity \approx 0.17 \ mol \ C_6H_12O_6 /L[/tex]
1 mole per liter is also equal to 1 M.
[tex]molarity = 0.17 \ M \ C_6H_12O_6[/tex]
Se midió el pH de una muestra del agua de lluvia en la ciudad de México, y se obtuvo un valor de 3.5 Calcula la [H+] en dicha muestra.
Answer:
[tex][H^+]=3.16x10^{-4}M[/tex]
Explanation:
¡Hola!
En este caso, dado que el pH de una solución se entiende como el potencial de los iones hidrógeno en la misma, es posible recordar la ecuación que se usa para calcularlo:
[tex]pH=-log([H^+])[/tex]
De este modo, al conocer el pH, se resuelve para la concentración de iones hidrógeno como se muestra a continuación:
[tex][H^+]=10^{-pH}[/tex]
Así, reemplazamos el pH para obtener:
[tex][H^+]=10^{-3.5}=3.16x10^{-4}M[/tex]
¡Saludos!
(GIVING BRAINLIEST) Which is NOT an example of a good source of complex carbohydrates?
peas
beans
whole-wheat bread
white bread
Answer: White bread
Explanation:
AQRS is an isosceles triangle. What is the length of RT
? Round to the nearest hundredth. Enter your answer in the box.
11 cm
a
T 6cm s
Answer:
Length of RT = 9.22 cm to the nearest hundredth
Explanation:
Considering the image up in the attachment, ΔRST is a right-angled triangle.
The length of two sides of ΔRST is given as 11cm and 6 cm. The length of the third side which is RT can be obtained using Pythagoras ' rule which says that the sum of the squares of two sides of a right-angled triangle is equal to the square of the hypotenuse.
This rule is given as: c² = b² + a² where c is the hypotenuse and a and b are the other two sides of the right-angled triangle.
In ΔRST, the length of the hypotenuse = 11 cm, the length of one of the two sides = 6cm, length of RT = x
Solving for x: (11 cm)² = (x cm)² + (6 cm)²
(x cm)² = 121 cm² - 36 cm²
(x cm)² = 85 cm²
x cm = √85
x = 9.22 cm to the nearest hundredth
Therefore, length of RT = 9.22 cm to the nearest hundredth
What type of reaction does this model represent?
1. single replacement
2. double replacement
3. Decomposition
4. double displacement
Answer:
1. single replacement
Explanation:
Single replacement can be represented by AB+C ⇄B+AC, which matches the picture
Double replacement and double displacement are the same kind of reaction and can be represented by AB+CD ⇄BD+AC
Decomposition reaction can be represented by AB ⇄A+B
What statement best explains how life functions a unicellular organism are carried out?
Answer:
The structures in the cell work together to perform its life functions
Explanation:
Answer:
What statement best explains how life functions a unicellular organism are carried out?
Explanation:
A bicycle tire holds 1.50 L of air at 5atm and 20.0 °C. How many moles of air is this?
If the average mass of air is 29.0 g/mol, what is the mass of air in the tire?
Answer:
9.05 g
Explanation:
PV=nRT
Use the ideal gas equation. Substitute values.
P = 5 atm
V = 1.50 L
n = ?
R (gas constant) = 0.08206 L-atm/mol-K
T = 20.0°C
*Always convert °C to K.
T = 20.0° + 273 = 293K
Substitute values.
(5 atm)(1.50 L) = n(0.08206 L-atm/mol-K)(293K)
n = (5 atm)(1.50 L) / (0.08206 L-atm/mol-K)(293K)
n = 0.3119335... mol
Convert to grams with the given average mass of air.
0.3119335... mol x (29.0 g/1 mol) = 9.05 g
HELP ASAP plz!:) I’ll give brainliest
Answer:
it is closer to the south pole
Explanation:
When a small piece of sodium metal is dropped into a beaker of water, hydrogen gas (H2) and a solution of sodium hydroxide (NaOH) are products. The solution becomes warm.
Answer:
The reaction is exothermic as the solution becomes warm.
Explanation:
Hello there!
In this case according to the described reaction between sodium metal and water, we can write up the chemical equation whereas the products turn out to be sodium hydroxide and hydrogen gas:
[tex]2Na+2H_2O\rightarrow 2NaOH+H_2[/tex]
Moreover, these reactions are known to be highly exothermic, for that reason the solution becomes warm as the reaction releases heat as it goes to completion.
Best regards!
Which of the following is another term for eruptions of gas on the sun's surface?
A. nuclear fusion
B. sunspots
C. coronas
D. solar flares
Answer:
D
Explanation:
How many molecules are in
6.0 moles of methane (CH4)?
Let's begin by setting up our equation.
What belongs in the green box?
6.0 moles CHA
A. 1 mole CH4
B. 6.02 x 1023 molecules CH4
Madison is heating two different liquids. For each liquid, she wants to compare the temperatures at which gas bubbles form, rise, and begin to escape. What physical property is Madison using to compare the liquids?Immersive Reader boiling point conductivity melting point solubility
Answer:
I think its boiling point conductivity
Answer: boiling point
Explanation:
Got it right
someone help me on these two 2
Answer:
Question 4 is- Solubility
Question 5 is- Suspension
Hopes this helps >:D
what is the mass of 2.31 x 10^23 formula units of SrF2?
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 40.51 g is the mass of 2.31x10²³ formula units of SrF[tex]_2[/tex].
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. It measure the number of elementary entities of a given substance that are present in a given sample.
Given number of atoms= 2.31x10²³atoms
we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number
mole =given number of atoms ÷ 6.022×10²³(Avogadro number)
Substituting the values
mole= 2.31x10²³÷ 6.022×10²³
mole = 0.38 moles of SrF[tex]_2[/tex]
mass of SrF[tex]_2[/tex]= moles of SrF[tex]_2[/tex] × Molar mass of SrF[tex]_2[/tex]
mass of SrF[tex]_2[/tex]= 0.38 × 106.6184
mass of SrF[tex]_2[/tex] = 40.51 g
Therefore, 40.51 g is the mass of 2.31x10²³ formula units of SrF[tex]_2[/tex].
To know more about mole, here:
https://brainly.com/question/15209553
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Think about a wooden chair and a balloon. What do these two objects always have in common?
Both are made of atoms.
Both have the same physical properties.
Both are made of the same kind of atom.
Both are made of the same number of atoms.
Answer:
both are made of atoms. .
Answer:
Both are made of atoms.
Explanation:
One advantage to using nuclear power is —
it produces no air pollution
it is hard to store and dispose of the waste
the expense of constructing nuclear reactors
the threat of an accident
Answer:
it produces no air pollution
If the temperature remains constant and pressure is INCREASED on gas, what will happen to the volume?
The volume will increase.
The volume will decrease.
The volume will not change.
The volume will randomly increase and decrease, and keep doing this.
Answer:
I believe the volume should increase.
1. A student wants to find how many calories are in a peanut. Describe in detailed complete sentences how they can test this using a can with
150g of water and a thermometer.
Answer: 65 cal
Explanation: they have to find the weight of the peanuts on a scale and per grams. Then put them in water . You should be able to get the calories
Which of the following pictures is a chemical change, and which is a
physical change? Explain in the boxes next to the picture.
Plz explain
Answer:
left is chemical because its chemicals, and right is physical because the ice cream is melting and thats physical
Explanation:
what is the chemical equation for
3fe(s)+4h2o(l)→fe3o4(s)+4h2(g)
Answer:
3fe s )+ 4h2o G )= fe3o4 s )+ 4h2 G
Explanation: 3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g) (i) Iron metal is getting oxidised. (ii) Water is getting reduced. (iii) Water is acting as reducing agent.
Explanation:
i make a search
What do all electrolytes have in common?
They have low melting points.
They are polar molecules.
They have mobile ions in solution.
They are compounds of carbon.
Which of these would be found in a wetland?
Mrs. Cornell and vultures
Cattails and salamanders
Maple trees and cats
Oak trees and squirrels
Answer:
jwjsjdjdhdvjeiejjrjrje
List two kinds of text structure
Answer:
Chronological: discussing things in order.
Cause and effect: explaining a cause and its results.
What are cathode rays
Answer:
a beam of electrons emitted from the cathode of a high-vacuum tube.
Explanation:
Cathode rays (also known as electron beam or e-beam) are electron waves that can be used in vacuum tubes.
determine the molar mass of water. WRITE THE UNITS