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Effectus [21]
3 years ago
9

Hematite is a naturally occurring mineral and a common form of iron ore. The following statements describe physical and chemical

changes occurring to hematite. Which statement describes a chemical change? A. The hematite particles separate from each other but remain the same substance. B. The hematite particles rearrange to form a new substance. C. The hematite particles are mixed with particles of a different substance. D. The hematite particles vibrate more quickly when they are heated. E. The hematite particles are moved from one location to another location.
Chemistry
2 answers:
Oksanka [162]3 years ago
8 0
<h2>Answer : Option B) The hematite particles rearrange to form a new substance.</h2><h3>Explanation :</h3>

Hematite particles when gets rearranged to form a new substance,  is an example of a chemical change.

As a chemical changes is usually a change where a substance undergoes a chemical change and forms a new substance; which cannot be easily reversed into reactants by any simple physical methods.

In this example the hematite ore forms a new substance by an irreversible chemical change.

podryga [215]3 years ago
4 0
<h2>Physical and Chemical changes occurring to Hematite - Option B</h2>

The Hematite particles rearrange to form a new substance. It describes a physical and chemical change occuring to Hemtite. When these particles get rearranged to produce a new substance, such a change is known as chemical change.

Chemical changes are often a variation in which an object changes chemically and become into a new species. Such a species cannot be reversed into reactants through any simple physical methods. Hematite particles form a new substance by an irreversible chemical change which cannot form reactants by-products.

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Heat never travels from a cooler object to a warmer object.
prohojiy [21]

Answer:

I would say False.

4 0
3 years ago
If I have 72 liters of argon gas held at a pressure of 3.4 atm and a temperature of 225k how many grams of argon do I have
andrezito [222]

Answer:

516.77 grams of Argon gas is present

Explanation:

Using the gas formula

PV = nRT

number of moles (n) = mass / molar weight or mass

P = pressure = 3.4 atm

V = volume = 72 L

R = gas constant = 0.082 L atm mol^-1 K^-1

T = temperature = 225 K

MM = molar mass of Ar = 38.984 g/mol

PV = mRT/ MM

m = PV MM / RT

m = 3.4 * 72 * 38.948 / 0.082 * 225

m =  9534.4704 / 18.45

m = 516.77 grams

the mass of Ar gas you have is 516.77 grams.

5 0
3 years ago
A cylinder with 10 mL of coconut oil has a mass of 9.3 g. What is the density of the oil? Round to the nearest hundredth. ​
lakkis [162]

Answer:

0.93 grams per milliliter

Explanation:

Density is the division of mass by volume. It is how "hefty" an object is; for example, wood isn't very "hefty" but metal is. The density is measured in mass over volume, so it is 9.3/10. After applying units, it is 0.93 grams per milliliter.

6 0
3 years ago
What is the change in internal energy (ΔΕ) of a system when 5 kJ of work is done on the system while it releases 13 kJ of energy
meriva

The change in internal energy (ΔΕ) of a system : -8 kJ

<h3>Further explanation  </h3>

The laws of thermodynamics 1 state that: energy can be changed but cannot be destroyed or created  

The equation is:  

 \tt \Delta U=Q+W

Energy owned by the system is expressed as internal energy (U)  

This internal energy can change if it absorbs heat Q (U> 0), or releases heat (U <0). Or the internal energy can change if the system does work or accepts work (W)  

The sign rules for heat and work are set as follows:  

• The system receives heat, Q +  

• The system releases heat, Q -  

• The system does work, W -  

• the system accepts work, W +  

5 kJ of work is done on the system : W = +5 kJ

releases 13 kJ of energy to the surroundings : Q = -13 kJ

\tt \Delta E=-13+5=-8~kJ

6 0
3 years ago
Why couldn't you substitute 3m H2SO4 for concentrated HNO3 when oxidizing copper?
schepotkina [342]

This question seems to be an essay question from experiment. Different solution of oxidizing agent will have different strength.  Sulfuric acid or H2SO4 is weaker oxidizing agent when compared to nitric acid (HNO3). In this case, if you subtitute the H2SO4 you wouldn't be able to get the same result for the experiment.



5 0
3 years ago
Read 2 more answers
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