Answers
Answer:
1. They can tell that a reaction has taken place if there is formation of gas bubbles in the test tube as well as if the metal dissolves in the acid solution
2. To determine which metal is more reactive, they would compare how fast each reaction occurs. The most reactive metal would have the fastest rate of reaction with a vigorous formation of bubbles, whereas the least reactive metal will have the slowest rate of reaction.
Explanation:
1. Metal which are more electropositive than hydrogen displace hydrogen from dilute acids with the formation of the salt of the metal and evolution of hydrogen gas. Therefore, the formation of gas bubbles in the test tube indicates that a reaction is taking place.
2. The rate of formation of the gas bubbles as well as the time taken for the reaction to come to a completion by the dissolution of the metal in the acid indicates which metal is more reactive. The most reactive metal would have the fastest rate of reaction with a vigorous formation of bubbles, whereas the least reactive metal will have the slowest rate of reaction.
However, the rate of the reaction is also affected by the concentration of the acid used. The higher the concentration of the acid, the faster the reaction rate.
Related Questions
Which of the following options shows metallic bonding:
1.silver spoon
2.
bronze medal
3.
solid table salt
Answers
Answer:
bronze medal i guess
i hope its correct.
Explanation:
Answer:
silver spoon
Explanation:
i had this for castle learning and guessed this and it was right
Which of the following is an example of potential energy?*
A firework exploding.
O A race car gaining speed towards the finish line.
O A phone sitting on the desk.
O Boiling water.
Answers
boiling waterAnswer:
Explanation:
its called thermal energy
Please select the word from the list that best fits the definition
stage in a star's evolution formed as the core of a main sequence star uses up its helium and the outer layers escape into
Answers
Explanation:
Giant Gas Cloud. A star originates from a large cloud of gas. ...
Protostar. When the gas particles in the molecular cloud run into each other, heat energy is produced. ...
T-Tauri Phase. ...
Main Sequence. ...
Red Giant. ...
The Fusion of Heavier Elements. ...
Supernovae and Planetary Nebulae
If the heat of combustion for a specific compound is −1160.0 kJ/mol and its molar mass is 86.47 g/mol, how many grams of this compound must you burn to release 541.20 kJ of heat?
Answers
Answer:
40.34 g
Explanation:
First, we divide the heat to release by the heat of combustion to obtain the required moles of compound:
541.20 kJ/(1160.00 kJ/mol) = 0.4665 mol
So, we have to burn approximately 0.47 mol of the compound. We convert the moles to mass in grams by using the molar mass:
mass = molar mass x moles = 86.47 g/mol x 0.4665 mol = 40.34 g
Therefore, you must burn 40.34 grams of the compound to release 541.20 kJ of heat.
How would you solve this?
Answers
HELP PLS 50 POINTSSSS
Listed in the Item Bank are some key terms and expressions associated with the categories seen in the Venn Diagram. To find out more
information about items, some have more details available when you click on them. Drag and drop each item onto the proper area of the
diagram. If an item describes more than one category, be sure to place it in the overlapping space.
ITEM BANK: Move to Bottom
Carbon dioxide is a product. Carbon dioxide is a reactant. Carried out in animals.
Carried out in plants
Chemical Reaction
Oxygen is a product
Oxygen is reactant Produces usable energy sourc
Cellular Respiration
Both
Photosynthesis
Answers
Answer:
Carbon dioxide is a product (cellular respiration)
Carbon dioxide is a reactant(photosynthesis)
Carried out in animals(cellular respiration)
Carried out in plants(both)
Chemical reaction(cellular respiration)
Oxygen is a product(photosynthesis)
Oxygen is a reactant(cellular respiration)
Produces usable energy source(photosynthesis)
Your welcome!!! Plz mark brainliest.
Answer:attached is the correct answer
Explanation:
Photosynthesis and Respiration
How many molecules are in 2.0 moles of oxygen gas
Answers
Answer:
6.02 X 1023 molecules
Explanation:
does anyone have the answer key to half life gizmos !!!!!!!!!!!
Answers
A caterpillar travels across the length of a 2.00 m porch in 6.5 minutes. What is the average velocity of the caterpillar in m/s?
Answers
Answer:
.0051 m/s
Explanation:
We know the catepillar moves at 2 meters every 6.5 minutes. Convert minutes to seconds (6.5 * 60)
Then we have 2 m / 390 seconds. Divide the fraction.
What are the uses of tritium?
Answers
Answer:
biochemical research, animal metabolism studies, and ground water transport measurements.
Explanation:
a sample of 1.7×10^23 molecules of silicon is ____ moles.
Answers
Answer:
0.28moles of silicon
Explanation:
Given parameters:
Number of molecules of silicon = 1.7 x 10²³molecules
Unknown:
Number of moles of the silicon = ?
Solution:
A mole of any substance contains the Avogadro's number of particles.
1 mole of a substance contains 6.02 x 10²³molecules;
So;
1.7 x 10²³molecules contains [tex]\frac{1.7 x 10^{23} }{6.02 x 10^{23} }[/tex] = 0.28moles of silicon
How did Wegener use similar mountain ranges and areas made of certain types of rock found in Africa and South American as evidence that these 2 continents were once connected?
Answers
Answer:
the Germany scientist Alfred Wagner describes fold mountains that are found in The world are the same also geological similarity that occur between this continent are the same for example the rock that are found in brazil are the same of that of south africa.
Erosion never ________ plz help
Answers
How many elements and how many atoms are in MgCI2
Answers
Answer: two elements and three atoms
Explanation:
An element is the simplest substance and hence cannot be broken down using chemical reactions.
Magnesium chloride [tex](MgCl_2)[/tex] is an ionic compound formed by the transfer of electrons from element magnesium (Mg) to element chlorine (Cl) where Magmesium forms a cation [tex]Mg^{2+}[/tex] by losing two electrons and chlorine forms an anion [tex]Cl^{-}[/tex] by gaining electron.
There are 3 atoms in Magnesium chloride [tex](MgCl_2)[/tex] which include one atom of magnesium (Mg) and two atoms of chlorine (Cl).
What do we know about the number of protons and electrons for any element found on the periodic table?
Answers
Answer:
Atoms are neutral in electrical charge because they have the same number of negative electrons as positive protons (Table 4.5. 1). Therefore, the atomic number of an atom also tells you how many electrons the atom has. This, in turn, determines many of the atom's chemical properties
Explanation:
Urgent!!! Label these please!
Answers
Answer:
sorry but what is that what will do to thatWhich biome receives too little water to support the growth of trees?
taiga
rain forest
deciduous forest
grassland
Answers
Answer:
Grassland
Explanation:
Grasslands have too little water to support trees as it does not rain very often in more temperate Grasslands
Please help me!
Thank you
Answers
Hope it helps!!
H2O+O2=H202, how would I balance this equation?
Answers
Answer:
2H2O2→2H2O+O2
Explanation:
This reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.
Add 2 molecules of hydrogen peroxide and 2 molecules of water. Since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.
2H2O2→2H2O+O2
4) What is one advantage of using non-renewable resources?
Answers
Answer:
The main advantages of non-renewable energies is that they are abundant and affordable. For example, oil and diesel are still good choices for powering vehicles. Non-renewable energy is cost effective and easier to product and use.
Explanation:
there yah go
15.
A mixture of carbon dioxide and hydrogen gases is maintained in a 9.62 L flask at a pressure of 3.44 atm and a temperature of 63 °C. If the gas mixture contains 12.5 grams of carbon dioxide, the number of grams of hydrogen in the mixture is _____
g.
Answers
Answer:
Mass = 1.84 g
Explanation:
Given data:
Total pressure = 3.44 atm
Volume of flask = 9.62 L
Temperature = 63°C = 63+273.15K = 336.15 K
Mass of CO₂ = 12.5 g
Mass of hydrogen = ?
Solution:
Number of moles of CO₂:
Number of moles = mass/molar mass
Number of moles = 12.5 g/ 44 g/mol
Number of moles = 0.28 mol
Pressure of CO₂:
PV = nRT
R = general gas constant = 0.0821 atm.L/mol.K
P = 0.28 mol × 0.0821 atm.L/mol.K × 336.15 K / 9.62 L
P = 7.73 atm.L/ 9.62 L
P = 0.8 atm
Total pressure = Partial pressure of CO₂ + Partial pressure of H₂
3.44 atm = 0.8 atm + P(H₂)
P(H₂) = 3.44 atm - 0.8 atm
P(H₂) = 2.64 atm
Number of moles of hydrogen:
PV = nRT
2.64 atm × 9.62 L = n × 0.0821 atm.L/mol.K × 336.15 K
25.39 atm.L = n × 27.59atm.L/mol
n = 25.39 atm.L / 27.59atm.L/mol
n = 0.92 mol
Mass of hydrogen:
Mass = number of moles × molar mass
Mass = 0.92 mol × 2 g/mol
Mass = 1.84 g
5.Calculate the number of moles of 18.0 dm3 of carbon monoxide (CO) at rtp.
Answers
Answer:
0.81mole
Explanation:
Given:
Volume of carbon monoxide = 18dm³
Unknown
Number of moles of carbon monoxide = ?
Solution:
To solve this problem;
1 mole of any gas at rtp occupies a volume of 22.4dm³
So;
x mole of carbon monoxide will occupy a volume of 18dm³ at rtp
22.4x = 18
x = [tex]\frac{18}{22.4}[/tex] = 0.81mole
What is the name of the family highlighted of
the periodic table above? How many valence
electrons does it have?
Answers
What is the general form of a single replacement reaction
Answers
Answer: A. AB+C->CB+A
Explanation:
The chemical reaction includes the reactant and products. The single replacement reaction can be given as AB + C → CB + A. Thus option a is correct.
What is a single replacement reaction?A single replacement reaction is the exchange reaction that involves the substitution of a single element of the reactant with another element of the reactant species.
The reaction between zinc and copper chloride is a single replacement reaction as copper is replaced by zinc in the copper chloride compound to produce zinc chloride and copper.
Therefore, option A. AB + C → CB + A is the single replacement reaction.
Learn more about single replacement reaction here:
https://brainly.com/question/13903783
#SPJ2
A 3.78 g sample of a blue-colored powder contains 1.52 g of chromium, 0.88 g of sulfur and 1.38 g of oxygen.
What is the Empirical formula of the compound?
Answers
Answer:
CrSO₃
Explanation:
Given parameters:
Mass of sample = 3.78g
Mass of chromium = 1.52g
Mass of sulfur = 0.88g
Mass of oxygen = 1.38g
Unknown:
Empirical formula of the compound = ?
Solution:
The empirical formula of a compound is the simplest formula of such a compound.
To solve this problem, follow the chart below:
Elements Cr S O
Mass 1.52 0.88 1.38
Molar mass 52 32 16
Number of moles 1.52/52 0.88/32 1.38/16
0.029 0.028 0.086
Divide through by
the smallest 0.029/0.028 0.028/0.028 0.086/0.028
1 1 3
So,
The empirical formula is CrSO₃
What do the molecules do when they gain more kinetic energy and how does that affect the density?
Answers
The more kinetic energy a substance has, the warmer it will be and the faster particles will be moving, which reduces the density of the substance
How does thermal energy affect chemical changes
Answers
Answer:
It makes chemicals hot or cold which makes chemicals react differently
Explanation:
mark me brainliest
How has the way humans communicate changed over time?
Answers
El volumen de un gas en un recipiente cerrado es de 3.5 litros a una temperatura de 25oC y una atmósfera constante de presión. ¿ Cuál es el volumen del gas en el recipiente si se disminuye la temperatura a 7oC?
Answers
Answer:
El volumen del gas en el recipiente es 3.29 L si se disminuye la temperatura a 7°C
Explanation:
La Ley de Charles es una ley de los gases que relaciona el volumen y la temperatura de una cierta cantidad de gas a presión constante.
Esta ley establece que el volumen es directamente proporcional a la temperatura del gas. Es decir que si la temperatura aumenta, el volumen del gas aumenta, mientras que si la temperatura del gas disminuye, el volumen disminuye.
Matemáticamente, si la cantidad de gas y la presión permanecen constantes, el cociente entre el volumen y la temperatura siempre tiene el mismo valor:
[tex]\frac{V}{T}=k[/tex]
Suponiendo un cierto volumen de gas V1 que se encuentra a una temperatura T1 al comienzo del experimento, al variar el volumen de gas hasta un nuevo valor V2, entonces la temperatura cambiará a T2, y se cumplirá:
[tex]\frac{V1}{T1}=\frac{V2}{T2}[/tex]
En este caso, sabes:
V1= 3.5 LT1= 25 °C=298 °K (siendo 0°C=273°K)V2=?T2=7 °C=280 °KReemplazando:
[tex]\frac{3.5 L}{298 K}=\frac{V2}{280 K}[/tex]
Y resolviendo obtienes:
[tex]V2=280 K*\frac{3.5 L}{298 K}[/tex]
V2= 3.29 L
El volumen del gas en el recipiente es 3.29 L si se disminuye la temperatura a 7°C
Name the four different types of Spheres belonging to Earth and give examples of Renewable resource and the Biotic factors that exist in those spheres. There are three Abiotic (Non Living) spheres and the Biotic (Living)Biosphere exist within the three of the others
Write a short summary of the renewable resources in each sphere and explain how the biosphere interacts within the three of them
Answers
Answer:
Everything in Earth's system can be placed into one of four major subsystems: land, water, living things, or air. These four subsystems are called "spheres." Specifically, they are the "lithosphere" (land), "hydrosphere" (water), "biosphere" (living things), and "atmosphere" (air).
Explanation: