____ Turns food into a new form: a form that cells can use. A chemical change. B grinding. C physical change. D mixing. Why
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A vineyard has 145 acres of Chardonnay grapes. A particular soil supplement requires 5.50 g for every square meter of vineyard. How many kilograms of the soil supplement are required for the entire vineyard? (Recall that 1 km2 = 247 acres.) Express your answer in kilograms to three significant figures.
When two continental plates of similardensities collide,A. they remain level since densities in both plates are equal.B. they both push back down into the mantleC. one plate rides over the other one and forms a trenchD.they buckle upward and form mountains
How might a dependence on fossil fuels lead to international security risks?a. The greater demand for fossil fuels with decreasing supplies could lead to an increase in competitive action over limited resources. b. A dependence on fossil fuels could lead more countries to produce oil, leading to greater competition for sales. c. An increase in dependence on fossil fuels could lead to lower costs for oil, causing disputes between producer and consumer countries. d. All of the above
(2) a molecular compound
(3) a metal
(4) a nonmetal
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Answer: Option (1) is the correct answer.
Explanation:
An ionic compound is the compound which is composed of oppositely charged ions.
When an ionic compound is in a solid state, then oppositely charged ions are held together by strong electrostatic force of attraction. To break is force of attraction, high energy is required. That is why, ionic compounds do not conduct electricity as a solid.
Whereas in melted state, the ions are less tightly held and as a result they can move easily from one place to another. Also in melted state, ionic compounds act as strong electrolyte. Hence, they are able to conduct electricity.
On the other hand, molecular compounds are poor conductors of electricity and non-metals do not conduct electricity. Whereas a metal is a good conductor of electricity even in its solid state.
Thus, we can conclude that a substance that does not conduct electricity as a solid but does conduct electricity when melted is most likely classified as an ionic compound.
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Answer:
Atomic radius of sodium = 227 pm
Atomic radius of potassium = 280 pm
Explanation:
Atomic radii trend along group:
As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.
Consider the example of sodium and potassium.
Sodium is present above the potassium with in same group i.e, group one.
The atomic number of sodium is 11 and potassium 19.
So potassium will have larger atomic radius as compared to sodium.
Atomic radius of sodium = 227 pm
Atomic radius of potassium = 280 pm
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C17H18F3NO = 309.33 g/mol
1 mol -------------- 309.33 g
x mol -------------- 3 g
x = 3 / 309.33
x = 0.00969 mol
1 mol ------------- 6.02x10²³ molecules
0.00969 --------- y molecules
y = 0.00969 * 6.10x10²³
y = 5.83x10^21 molecules
hope this helps!.
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Answer:
The answer is B. Only synthesis.
Explanation:
Synthesis reactions are those in which two substances combine, giving rise to new substances. Breakdown of chemical bonds in reagents and formation of other bonds occurs, giving rise to new species.
A combustion is any reaction created between the combustible material and the oxidizer. Oxygen has the ability to combine with various elements to produce oxides. There are oxidations that are extremely slow, but when it is fast it is called combustion. That is why the oxidizer is oxygen, and the fuel is usually hydrocarbons (organic compounds made up of only carbon and hydrogen atoms). These usually go into combustion with ease.
In this case it is a synthesis, where two reagents, and
, are combined to form a product,
. It is not a combustion because despite having
there is no hydrocarbon.
So the answer is
A. Both synthesis and combustion.
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The potassium nuclei have been unstable and results in the spontaneous decay without any external force. Thus, option 3 is correct.
Potassium has been the metal of group 1 of the periodic table. It has been consisted of 19 protons and 20 neutrons in the nucleus.
Decay of potassium nuclei
The nuclei decay has been achieved when there has been loss of the protons in the nuclei, resulting in the radioactive isotopes.
The potassium nuclei have been unstable and results in the spontaneous decay without any external force. Thus, option 3 is correct.
Learn more about potassium nuclei, here:
In general though, the potassium atom has 19 protons, and has 1 valence electron in the 4s orbital. The nucleus of the atom contains 19 protons and (21 neutrons on average.) If we were too apply the laws regarding the band of stability then that ratio is very stable and it is very unlikely (less than 10^-21%) that the nucleus would ever go through any form of decay.