Answer:
A molecule is a group of two or more atoms held together by chemical bonds. A compound is a substance which is formed by two or more different types of elements which are united chemically in a fixed proportion. All molecules are not compounds. All compounds are molecules.
Explanation:
Dos objetos presentan fuerzas eléctricas repulsivas entre sí. ¿Cómo pueden ser las cargas eléctricas de estos objetos?
Answer:
Las cargas eléctricas de los objetos son ambas positivas o son ambas negativas.
Explanation:
Si dos objetos presentan fuerzas eléctricas repulsivas entre sí, quiere decir que ambos tienen el mismo tipo de carga.
Las cargas iguales (positivo con positivo, o negativo con negativo) se repelen, mientras que las cargas diferentes (positivo con negativo) se atraen.
give a reason why it is not advisable to heat magnesium before heating ammonium nitrate
Answer:
it can result in an increasing risk of the accumulation of decomposition products, self-heating (from the heat released by the slow decomposition reactions)
Magnesium can result in an increased risk of the accumulation of decomposition products, self-heating (from the heat released by the slow decomposition reactions)
What is ammonium nitrate?Ammonium nitrate is used commonly in fertilizers; in pyrotechniques, herbicides, and insecticides; and in the manufacture of nitrous oxide.
When ammonium nitrate is heated, it decomposes exothermically into nitrous oxide and water.
Hence, Magnesium can result in an increased risk of the accumulation of decomposition products, self-heating (from the heat released by the slow decomposition reactions)
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For a reaction to be in equilibrium.... *
A. concentration of reactants and products remain constant
B. concentration of reactants and products must be the same
C. the rate of forward reaction is not equal to the rate of backward reaction.
Answer: C) the rate of forward reaction is not equal to the rate of backward reaction. This should be the answer.
Explanation:
Solar power, natural gas, and wood are all nonrenewable energy sources
Both renewable and nonrenewable resources
how do particles of salt and dust affect cloud formation?
Answer:
Cloud formation: Insoluble dust particles can form cloud droplets that affect global and regional climate. Scientists have long recognized the importance of soluble particles, such as sea salt and sulfates, in creating the droplets that form clouds and lead to precipitation.
+
What category would the following amino acids be placed in and are they in the Lord
configuration? (2 marks)
COO-
A)
COO-
B)
H2N-C-H
H-C-NH3
CH2
CH2
OH
Plz someone help, really struggling
How many liters of carbon monoxide are needed to react with 32.65 g oxygen gas to produce carbon dioxide?
Answer:
2.040 mol CO
Explanation:
First, write out your reaction:
CO + O2 --> CO2
Balance the reaction:
2CO + O2 --> 2CO2
Now divide the 32.65 g O2 by the molar mass of O2 (32.00 g/mol) to get moles of O2. Then multiply by the mole ratio of 2 mol CO for every 1 mol O2 to get moles of CO needed to fully react.
32.65 g O2 / 32.00 g/mol = 1.020 mol O2
1.020 mol O2 • 2 mol CO / 1 mol O2 = 2.040 mol CO
Write Avogadro's number in "longhand", and then in scientific notation.
Answer:
Explanation: the scientific notation used to calculate a mole is 6.022 x 1023.
Avogadro's number in scientific notation is 6.023×10²³ atoms, molecules, moles.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number.
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Determine the number of moles in 300 g S.
The number of moles present in 300 g of glucose is 1.7 moles or 2 moles approximately.
Explanation:
i did glucose cause i dont know what u meant by the S?
what kind of elements form ionic compounds?
Answer:
Ionic compounds generally form between elements that are metals and elements that are non metals. For example, the metal calcium (Ca) and the non metal chlorine (Cl) form the ionic compound calcium chloride (CaCl2). In this compound, there are two negative chloride ions for each positive calcium ion.
Explanation:
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HOW DO THE STATES OF MATTER FIT INTO THE K-M THEORY? PLS NO LINKS
Answer:Matter can exist in one of three main states: solid, liquid, or gas. Solid matter is composed of tightly packed particles. A solid will retain its shape; the particles are not free to move around.
Explanation:
Rubidium Rb
when was the element discovered and by whom ??? ASAP MAKE IT AT LEAST A PARAGRAPH!!!
Answer:
Rubidium Rb was discovered in 1861It was discovered by the German chemist Robert Wilhelm Bunsen and the German physicist Gustav-Robert KirchoffExplanation:
Rubidium was discovered by the German chemists Robert Bunsen and Gustav Kirchhoff in 1861 while analyzing samples of the mineral lepidolite with a device called a spectroscope. The sample produced a set of deep red spectral lines they had never seen before. Bunsen was eventually able to isolate samples of rubidium metal. Today, most rubidium is obtained as a byproduct of refining lithium.
How do properties of water break down rocks?
Answer:
Explanation:
Freezing water can break rock without any change in the minerals that form the rock (physical weathering). This usually produces small particles and sand. Water with dissolved gases and other chemicals causes the minerals in rocks to be changed, leading to the deterioration of the rock (chemical weathering).
chemical weathering
Explanation:
freezing water when mix with it cause detorilation of rocks
Which of the following is a symptom of mycoplasmosis in birds?
A. itchy rash
B. white ulcers
C. cloudy eyes
D. swollen joints
Answer:
Cloudy eyes
Explanation:
The article talks about eye infection
What reaction would you expect chromium to have with water
Answer: It does not react with water, but reacts with most acids. It combines with oxygen at room temperature to form chromium oxide. Chromium oxide forms a thin layer on the surface of the metal, protecting it from further corrosion (rusting).
Explanation:
When we look at heat transfer problems that include phase transitions, there can bemanynec-essary steps. Consider a material of massmthat undergoes two phase transitions: from solid toliquid and then from liquid to gas. It starts at an initial temperature ofT0(well below the meltingtemperature ofTm) and it heated until it is a gas at a temperature ofTf(well above the boilingtemperature ofTv). How many different steps (simple temperature changes or phase transitions)of heat transfer would you need for this problem
Answer:
There would be 3 temperature changes and 2 phase transitions
Explanation:
The temperature of the material would first increase from T0 to Tm (its melting point)- This is one temperature change.
It would the change from solid to liquid at its melting point Tm.- This is one phase transition.
Its temperature would then increase from its melting point Tm to its boiling point Tv -This is another temperature change.
It would then change from liquid to gas at its boiling point Tv - This is another phase transition.
Finally, its temperature would then increase from its boiling point to T(f) - This is the third temperature change.
So, there would be 3 temperature changes and 2 phase transitions
Vertical columns in the periodic table are called ______ of elements and have similar properties.
groups
period
PLEASE I NEED HELP ILL GIVE BRAINLYEST
What percentage increase did CO2 experience from 1800 to 2004 AD?
The percentage of CO2 increased 48 percent. Hope this helped!
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Ammonia (NH3) readily dissolves in water to yield a basic solution.
NH3 + H2O → NH4+ + OH-
How is this substance classified?
A.
Arrhenius Base
B.
Arrhenius Acid
C.
Bronsted-Lowry Base
D.
Bronsted-Lowry Acid
Answer:
Qué es Crecimiento poblacional:
El crecimiento poblacional se refiere al incremento del número de habitantes en un espacio y tiempo determinado, el cual se puede medir a través de una fórmula aritmética. También se puede emplear como sinónimo el término crecimiento demográfico.
Cuando se hace mención al crecimiento poblacional se puede hacer referencia a cualquier especie animal, sin embargo, se suele usar para referirse a los seres humanos, en especial cuando se realizan investigaciones acerca del crecimiento de la población.
Los datos que se obtienen de estos análisis son de gran importancia, tanto para los gobiernos de un país como, para las diferentes organizaciones internacionales.
Cabe resaltar que durante el siglo XX la población de seres humanos ha crecido y sigue creciendo en gran porcentaje, lo que ha generado preocupación, en especial por sus consecuencias sobre el uso y cuidado de los recursos naturales, entre otros.
Las zonas urbanas son las que presentan mayor crecimiento demográfico, así como, los países en vías de desarrollo. Por el contrario, el crecimiento poblacional es menor en los países desarrollados.
Por ejemplo, el crecimiento poblacional en México ha ido en aumento a lo largo de su historia, es el país con más habitantes hispanohablantes en América Latina. México tiene una población aproximada a 130 millones de habitantes, y se estima que seguirá creciendo gracias a diversos factores gracias a su continuo desarrollo político, económico y social.
4. How many molecules are equal to 2.25 moles of sulfur dioxide?
5. How many moles are equal to 2.4 x 1023 particles of sodium chloride?
Answer: 4. We know that one mole of any chemical compound always contains 6.022 x 10^23 molecules. Therefore, we can calculate the number of molecules of 2.25 moles of sulfur dioxide SO2 by multiplying the number of moles by the Avogadro's constant 6.022 x 10^23:
2.25 moles SO2 (6.022x10^23 molecules/1mole) = 1.355 x 10^24 molecules of sulfur dioxide
5. The number of moles of sodium chloride are 0.40 moles
Explanation:
what are some ways that you can change the physical phase of matter?
How does matter change from one state to another
Answer:
Adding or removing energy can change the physical matter.
Explanation:
Like for example changing temperature
What do plants do that requires Energy?
Answer:
Photosynthesis
Explanation:
Photosynthesis uses energy from light to convert water and carbon dioxide molecules into glucose (sugar molecule) and oxygen. The oxygen is released, or “exhaled”, from leaves while the energy contained within glucose molecules is used throughout the plant for growth, flower formation, and fruit development.
If the volume of a gas is 1020 ml at 120°C and 1160 torr, what will the volume be at 20°C and 700 torr?
Answer:
1260 mL
Explanation:
Use formula (P1V1)/T1 = (P2V2)/T2
convert C to K
120 +273 = 393 K
20 + 273 = 293 K
plug numbers in
((1160)(1020))/ 393 = ((V2)(700))/ 293
solve for V2
V2 = 1260.187 mL
The Concrete that surrounds a swimming pool takes less time to heat up than the water in the pool. Why
Answer:
The Concrete has a lower specific heat.
Explanation:
How many grams of 02 will be consumed?
23.36 g 02
11.68 g 02
PLEASE HELP!!!
Explain how an electric car might still run on fossil fuels.
Answer:
Explanation:
When you use electricity to charge your car, you can integrate renewable resources like solar into the fueling process. Without solar, your electric vehicle is still effectively running off of fossil fuels – it's just the fossil fuels utilized at the power plant and not within your engine.
Fossil fuels include substances like natural gas, coal, and oil. It is possible for electric cars to run on these fossil fuels. Fossil fuels like coal are burnt up to generate electricity. So when cars run on electricity, they are indirectly tapping into fossil fuels.
As the world continues to seek measures to reduce carbon emissions, electric cars are gradually becoming an option. While it is true that these fossil fuels might not be used directly on electric cars, they still find use indirectly in these cars. When coal is burnt up at the power plant to generate electricity, electric cars tap into fossil fuels indirectly.Learn more here:
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The velocity of an object consists of its speed and..
A. Average speed
B. Distance
C. Displacement
D. Direction
Answer:
direction
Explanation:
Please help me on this!
What is fault?
Which type of baundary (divergent,convergent, or transform) do the most earthwakes occur on?
Explain what convection currents are.
Please help this is a test abt science
Is the following chemical equation balanced? 1 C2H6+ 102 - 3 H2O + 2
CO2 *
Answer:
No
Explanation:
Answer: smallest whole numbers are 2, 7, 4 and 6
Explanation: C2H6 + 3.5 O2. ⇒ 2. CO2 + 3 H2O
How many grams of Carbon Dioxide can be produced by the complete combustion of 140.0 grams of propene; C3H6? If the actual yield turns out to be 200.0 grams of carbon dioxide, what is the percent yield?
Answer:
2 C3H6 + 9 O2 6 H2O + 6 CO2
Theo. yield is 440.0 g CO2, % yield = 45.45% Explanation: hope it helps here for ur service
439.16 g of carbon dioxide is produced by complete combustion of 140 g of propene. The percent yield is 45.54%.
What is combustion?Combustion is defined as a high temperature exothermic reaction between a fuel which acts as a reductant and an oxidant which is usually atmospheric oxygen.It does not result in fire as the flame is visible only when substance which undergoes combustion vaporizes.
For combustion reactions to take place stoichiometry is followed according to which mass of reactants or products obtained or required is calculated.
2 C₃H₆ + 9 O₂ [tex]\rightarrow[/tex] 6 CO₂ + 6 H₂O
Here 2 molecules of propene react to give 6 molecules of carbon dioxide.
∴ for 140 grams of propene 140×264/84.16=439.16 g of molecules of CO₂ are produced.
Percent yield is calculated by dividing observed yield by theoretical yield which gives 45.54% according to this example.
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