CHEMISTRY HIGH SCHOOL

Powdered iron is magnetic, but powdered sulfur is not. What occurs when they form a mixture in a beaker at room temperature ?(1) the iron retains its magnetic properties
(2) the iron loses its metallic properties
(3) the sulfur gains magnetic properties
(4) the sulfur gains metallic properties

Answers

Answer 1
Answer: The iron will retain its magnetic properties it will still magnetic and sulfur will not gain the magnetic properties so t will not be magnetic 
Answer 2
Answer:

The mixture of iron sulfide formed is non-magnetic wherein iron looses its magnetic properties.

How do properties of compound differ from elements?

The properties of compound are different from those of the elements from which it is formed. The reason to this  is when elements combine to form compounds ,the properties of elements are completely changed and have completely new set of properties.

When iron which has magnetic properties forms a mixture with sulfur  iron sulfide is formed,which is non-magnetic.Here, the iron looses it's magnetic properties as it forms compounds with sulfur.

On combining with sulfur, compound formed is iron sulfide with no magnetic properties .Thus on moving the magnet over this mixture does not attract any iron particle towards it as the properties are completely altered when compounds are formed.

Learn more about properties of compounds ,here:

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If the bird species cannot adapt to eat a different source of food, this species of bird will most likely

Answers

The correct answer for the question that is presented is this one: "become extinct." If the bird species cannot adapt to eat a different source of food, this species of bird will most likely become extinct. Given the fact that the climate of the location changes very quickly, and the ecosystem becomes too cold for fruit trees to survive.

A sample of a compound contains 32.0 g C and 8.0 g H. Its molar mass is 30.0 g/mol. What is the compound’s molecular formula

Answers

The compound's molecular formula is C2H6. This is obtained by:
  
            mass             moles               divided by smallest moles
C          32g         32/12 = 2.67                                 1
H           8g           8/1.01 = 7.92                        approx. 3

Next, divide both terms by the smallest number of moles, 2.67. This gives 1 and 3. So the empirical formula is CH3 which has a molar mass of 15g/mol. Given the molar mass of the molecular formula as 30g/mole, we can calculate the factor by which to multiply the subscripts of CH3.

X = molar mass of molecular formula / molar mass of empirical formula = 30/15
X=2

So (CH3)2 is C2H6.

Answer:

the answer is D on edge 2021

Explanation:

A 22.5 g sample of a metal is heated to 65.00 °C and added to 25.00 g of water (c = 4.184 J/g °C) in a calorimeter. The water temperature rises from 25.55 °C to 35.25 °C. What is the specific heat capacity of the metal?

Answers

Answer:

The specific heat capacity of the metal is 1.143 J/g°C

Explanation:

A typical excersise of calorimetry:

Q = m . C . ΔT

ΔT = Final T° - Initial T°

m = mass

In this case, the heat released by the metal is gained by the water to rise its temperature.

Qmetal = Qwater

(We consider that metal was at the same T° of water)

22.5 g  . C . (65°C - 25.55°C) = 25 g .  4.184 J/g°C . (35.25°C - 25.55°C)

22.5 g  . C . 39.45°C = 25g . 4.184 J/g°C . 9.7°C

887.625 g.°C . C = 1014.62J

C = 1014.62J / 887.625 g.°C

C = 1.143 J/g°C

Where does the energy from the nuclear reaction go?

Answers

The energy fro the nuclear reaction go on to split other nearby atoms


I hope that's help !


Using ohm's law, explain how voltage changes in relation to current, assuming that resistance remains constant.

Answers

1.) Ohm's law is understood as I = V/R. Given that resistance is constant, then voltage changes directly proportional to current.

6. Explain why the boiling point of water is a characteristic physical property, but the temperature and volume of a glass of water are not.

Answers

The physical property is a physical characteristic of a substance at some given conditions

for example

The density of water is 1 g/ mL at STP

The boiling point of water is 373K at 1 atm pressure

so boiling point of water is its physical property. It does not change with amount of the substance. The boiling point of water will remain the same for 1g and 1kg etc

now temperature is an instant measurement, the temperature may vary from sample to sample. Some water sample can be cool or some can be hot. So we cannot define that temperature of all water sample at a given pressure will be the same.

similarly the volume is a not a physical property. It will change from amount to amount.

1g of water sample will have different volume and 100g of water will have different volume while the density of water will remain the same.

A physical property is a property that does not change the original substance, meaning that it does not break any bonds, nor for any new ones. Though, a physical property can be changing the substances state of matter. 

When you are boiling water, you are changing its state to go from a liquid to a gas. The temperature is not a characteristic physical property because it doesn't help us know a lot about that substance, in other words, it isn't significant to the substance. Same goes for volume. 
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