Answer:
We observe that hydrogen burns at mouth of beaker with blue flame and pop sound is heard. It is a chemical change.PLSSS HELP MEE
CH3COOH + Mg
CH3-COOH+MgO
CH3 -COOH + Mg(OH)2
CH3-COOH + MgCO3
Explanation:
CH3COOH + Mg --> Mg(CH3COO)2 + H2
CH3COOH + MgO --> H2O + Mg(CH3COO)2
CH3COOH + Mg(OH)2 --> H2O + (CH3COO)2Mg
CH3COOH + MgCO3 --> (CH3COO)2Mg + CO2 + H2O.
*equations are not balanced.
hope it helps. :)
Chemistry test!!! no fake answers please and if you can explain then do it because I need all the help I can get!
Answer:
(−ΔH°1)+12(−ΔH°2)+(ΔH°3)+(ΔH°4)
I hope this helps you out!! :)
Identify the decay mode
Please answer asap no explanation needed
(Look at picture)
Answer:
1921 :3 espero y te ayude crack
A 21.5 L sample of gas at 107 kPa has a temperature of 27.2 °C. What is the pressure of the gas
if it is transferred to a 32.6L container at 44.1 °C?
Answer:
The right answer is "74.516 kPa".
Explanation:
The given values are:
V₁ = 21.5 L
V₂ = 32.6L
P₁ = 107 kPa
T₁ =27.2°C+273
T₂ = 44.1 °C+273
As we know,
⇒ [tex]\frac{P_1V_1}{T_1}= \frac{P_2V_2}{T_2}[/tex]
then,
⇒ [tex]P_2=\frac{P_1V_1T_2}{T_1V_2}[/tex]
On substituting the given values, we get
⇒ [tex]=\frac{107\times 21.5\times (44.1+273)}{(27.2+273)\times 32.6}[/tex]
⇒ [tex]=\frac{107\times 21.5\times 317}{300.2\times 32.6}[/tex]
⇒ [tex]=\frac{729258.5}{9786.52}[/tex]
⇒ [tex]=74.516 \ kPa[/tex]
Jimmie places a soccer ball on the ground and kicks it toward the goal. The ball moves along the ground toward the goal. Why does the ball move?
A. The kick decreases the weight of the ball.
B. The kick serves as a contact force on the ball.
C. The kick decreases the force of gravity acting on the ball.
D. The kick removes friction between the ball and the ground.
Answer:
D
Explanation:
Kicking the soccer muscles uses the foot muscle that is applied by mechanical force. The ball moves along the ground as the kick removes the friction.
What is friction?Friction is a resisting force that is encountered by an object or the surface when it moves along another surface. It occurs because the objector the surface slides against each other.
When the kick is applied to a ball lying on the surface then, the frictional force present between the ground and the ball is reduced so that the ball moves along.
Therefore, option D. the kick reduces or removes the frictional force.
Learn more about friction here:
https://brainly.com/question/23095978
✓ What kind of carbon storages would be the least affected by humans?
Answer:
trio
Explanation:
What are the characteristic property's of metals such as malleability and high conductivity are due to ?
Answer:
Metallic Bonding
Explanation:
Conductivity occurs when electrons or ions are free moving. The conductivity in metals is due to electrons being delocalized in a sea of electrons. Metals contain metallic bonding which allows the electrons to freely move.
Malleability happens when adjacent layers of positive ions move relative to one another while being in contact with the sea of electrons from the metallic bonding.
you may not want to wear a black shirt in the hot summer because light is
Answer:
The outer layer of fabric does get hotter because the black color absorbs more heat. And that heat doesn't get transmitted to the skin because of the thick fabric. But thin black clothing transmits that heat to the skin, making a person hotter.
Explanation:
Which renewable resource gets its direct energy from the sun?
O Geothermal
O Solar
O Hydoelectric
O Eolic
Answer:
Solar
Explanation:
Solar mean sun
Example (Solar Panels)
Answer:
Solar
Explanation:
Solar is a renewable energy that receives direct energy from the sun.
Cool air over warm water will:
Increase in temperature
Stay the same in temperature
Decrease in temperature
Answer:
Air and Water Temperature Increases
An increase in the air temperature will cause water temperatures to increase as well. ... Lower levels of dissolved oxygen due to the inverse relationship that exists between dissolved oxygen and temperature. As the temperature of the water increases, dissolved oxygen levels decrease.
2C(s) + 2H2(g) → C2H4(g): ΔH = +52.4 kJ/mol
Which statement about this reaction is correct? (3 points)
pls complete the table with the correct answer
Answer:
The correct answer is :
Natural fibres: these fibers are found naturally in the environment such as cotton, hemp or wool, all are made naturally found fibers.
sr. no. name type
1 Cotton natural
2 Linen natural
3 Silk natural
4 Wool natural
5. Hemp natural
Artificial fibres: made from the polymerization of their monomer unit for example polyester made from coal and petroleum products.
sr. no. name type
1 Polyester artificial
2 Rayon artificial
3 Spandex artificial
4 Acrylic artificial
5. microfibers artificial
Initially a NaOH solution was standardized by titration with a sample of potassium hydrogen phthalate, KHC8H4O4, a monoprotic acid often used as a primary standard. A sample of pure KHC8H4O4 weighing 1.518 grams was dissolved in water and titrated with the NaOH solution. To reach the equivalence point, 26.90 milliliters of base was required. Calculate the molarity o
Answer:
0.2763M NaOH
Explanation:
Based on the reaction of hydrogen phtalate, KHP, with sodium hydroxide, NaOH:
KHP + NaOH → KNaP + H₂O
1 mole of KHP reacts per mole of NaOH.
In the equivalence point, the moles of NaOH added = Moles of KHP that were dissolved.
Thus, to solve this question, we must find the moles of KHP = Moles NaOH. With the moles and the volume of NaOH required to reach the equivalence point we can find molarity of NaOH solution:
Moles KHP = Moles NaOH (Molar mass KHP = 204.22g/mol):
1.518g * (1mol / 204.22g) = 7.433x10⁻³ moles NaOH
In 26.90mL = 0.0269L:
7.433x10⁻³ moles NaOH / 0.02690L
0.2763M NaOHExplain the effect of change in concentration of a system in Equilibrium with at least one example.
Explanation:
If the concentration of a substance is changed, the equilibrium will shift to minimise the effect of that change. If the concentration of a reactant is increased the equilibrium will shift in the direction of the reaction that uses the reactants, so that the reactant concentration decreases. For example, decreased volume and therefore increased concentration of both reactants and products for the following reaction at equilibrium will shift the system toward more products.
The Davis Mountains in West Texas were once taller than they are now. Which of the following forces most likely caused the mountains to become shorter over time?
A. Weathering and erosion only
B. Chemical and mechanical weathering only
C. Erosion and deposition only
D. Weathering, erosion, and deposition
*Please don't put unhelpful answers, i have been stuck on this question for the past few days. Thank you!
Question 7 of 10
Which of the following is the correct name for N,03?
O A. Dinitrogen trioxide
O B. Nitrogen oxide
O C. Nitrogen trioxide
O D. Dinitrogen trioxygen
In a reaction, your actual product had a mass of 13.7 grams. You calculated that you need 29.3 grams to have the reaction go to completion. What is your percent yield?
Answer:
5.0
Explanation:
Help ASAP
3. Components in a heterogeneous mixture are not in the same phase or the composition of the mixture is
a) uniform
b) transparent
c) uneven
Answer:
c
Explanation:
Which of the following statements is true about a balanced chemical equation? A. The number of atoms in the products is greater than the number of atoms in the reactants. B. The number of atoms in the products is less than the number of atoms in the reactants. O C. The number of atoms in the products cannot be determined. O D. The number of atoms in the products is equal to the number of atoms in the reactants.
Answer:
D
Explanation:
the correct answer is D
The solubility of a substance can be measured in grams/liter. In a chemistry lab, Justin and Ellie are working with a substance that has a solubility of 12 grams/liter. This ratio means that 12 grams of the substance can dissolve in one liter of water. It would require liters of water to dissolve 36 grams of the substance.
De una misma estación salen, en el mismo instante, dos trenes, con velocidades constantes de 72 y 90 [km/h]. ¿Qué distancia separa ambos trenes luego de 2 horas de viaje si se mueven en la misma dirección ... a) ... Y en el mismo sentido de circulación?
Answer:
144 km y 180 km respectivamente.
Explanation:
¡Hola!
En este caso, dado que tenemos dos trenes con velocidades diferentes, es posible multiplicar la velocidad de cada tren por el tiempo común, con el fin the hallar la distance recorrida; es de entender, que a mayor velocidad, mayor distance ha de recorrer el tren:
[tex]d_1=72km/h*2h=144km\\\\d_2=90km/h*2h=180km[/tex]
Así, entendemos que el tren número 1 recorre 144 kilómetros, mientras que el tren número 2, 180 kilómetros.
¡Saludos!
A certain gas has a volume of 500.0 mL at 77.0°C and 600KPa. Calculate the temperature if the volume decreased to 400.0 mL and the pressure is increased to 760Kpa and assume the number of moles does not change.
Answer:
354.67K
Explanation:
Applying
P₁V₁/T₁ = P₂V₂/T₂................. Equation 1
Where Where P₁ = initial pressure, T₁ = Initial temperature, V₁ = Initial Volume, P₂ = Final pressure, V₂ = Final Volume, T₂ = Final Temperature.
From the question, we are ask to look for the final temperature,
Therefore we make T₂ the subject of the equation
T₂ = P₂V₂T₁/P₁V₁............. Equation 2
Given: P₁ = 600 kPa, V₁ = 500 mL, T₁ = 77 °C = (273+77) = 350 K, P₂ = 760 kPa, V₂ = 400.0 mL
Substitute these values into equation 2
T₂ = (760×400×350)/(600×500)
T₂ = 354.67 K
What impact did political parties in Africa have on the African desire for independence?
Why did African countries want independence?
answer:
After the Second World War people in Africa wanted change. Only Egypt, Liberia and Ethiopia were independent at that point. But it was Indian self-rule which triggered the momentum leading to independence.
chemistry:
plz help me:D
Answer:
1 atom only with the unit u.
Explanation:
The formula mass of a substance is defined as the sum of the atomic masses of all atoms in a formula unit of the particular substance in question.
Thus the correct answer is option A
how many moles are present in 332g of Ba(NO3)2
Answer:
The SI base unit for amount of substance is the mole. 1 grams Ba(NO3)2 is equal to 0.0038264798528183 mole.
Explanation:
define the word isotope
Answer:
Isotope, one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behaviour but with different atomic masses and physical properties.
Answer:
Isotopes are two or more types of atoms with the same atomic number but differing nucleon numbers due to varying numbers of neutrons in their nuclei.
OAmalOHopeO
What does corona mean?
Answer:
.
Explanation:
A cube of iron at 20C is placed in contact with a cube of copper at 60C. Which statement describes the initial flow of heat between the cubes?
Answer:
the iron is more condensed then the copper more electricity
10 POINTS
What is used to measure the volume of a solid with an irregular shape? O A. Gas displacement O B. Liquid displacement O C. Plasma displacement O D. Solid displacement
Answer:
Because many objects are not regularly shaped their volume cannot be determined using a volume formula. The volume of these objects can be found by water displacement. A volume of water sufficient to cover the object is placed in a graduated cylinder and the volume read. The object is added to the cylinder and the volume read again. The difference between the two volumes is the volume of the object. This method is demonstrated using the same battery used above.
Explanation:
Once a product is ready to be sold, engineers must explain their ideas to people who will bring the product to consumers.
Please select the best answer from the choices provided
ОТ
OF
Answer:
ot
Explanation:
there is no choices
Answer:
Advertise
Explanation:
once a product is ready to be sold, engineers explain their ideas to marketing people, who will advertise the product.