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2 years ago

If the chemical properties of a substance remain unchanged and the appearance or shape of an substance changes it is called a

Chemistry

1 answer:

vladimir1956 [14]2 years ago

3 0

Answer:

Physical change

Explanation:

Physical change -

It is the type of reversible change , where there is change in the state of the matter , is referred to as a physical change .

There is no chemical process involved during state change , i.e. , no new substance is formed .

Hence , from the given statement of the question, the correct term is physical change.

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One of the reactions that occurs in a blast furnace, in which iron ore is converted to cast iron, is Fe2O3 + 3CO → 2Fe + 3CO2 Su

solong [7]

Answer:

$89.55~\%~of~Fe_2O_3~in~the~sample$

Explanation:

The first step in this reaction is the converstion from Kg of $Fe$ to grams of $Fe_2O_3$ .

$1.19x10^3~Kg~Fe~\frac{1000g~Fe}{1~Kg~Fe}~\frac{1~mol~Fe}{55.84~g~Fe}~\frac{1~mol~Fe_2O_3}{2~mol~Fe}~\frac{159.68~g~Fe_2O_3}{1~mol~Fe_2O_3}~\frac{1~Kg~Fe_2O_3}{1000~g~Fe_2O_3}$

$X~=~1.7x10^3~Kg~Fe_2O_3$

Then we can calculate the percentage of $Fe_2O_3$ in the sample:

$\%~Fe_2O_3~=~\frac{1.7x10^3~Kg~Fe_2O_3}{1.9x10^3~Kg~Sample}*100$

$89.55~\%~of~Fe_2O_3~in~the~sample$

3 0

2 years ago

Sometimes the oxidation state of an analyte must be adjusted before it can be titrated.

alexdok [17]

Answer:

Explanation:

True

5 0

2 years ago

How many moles of chromium metal equal 7.52 × 1022 atoms Cr?

grigory [225]

Answer:

0.125 mole

Explanation:

From Avogadro's hypothesis, we discovered that 1 mole of any substance contains 6.02x10^23 atoms.

The statement above suggests that 1 mole of chromium contains 6.02x10^23 atoms.

Now, if 1mole of of chromium contains 6.02x10^23 atoms,

Then Xmol of chromium contains 7.52x10^22 atoms i.e

Xmol of chromium = 7.52x10^22/6.02x10^23

Xmol of chromium = 0.125 mole

Therefore, 0.125 mole of chromium contains 7.52x10^22 atoms

8 0

2 years ago

Although the scientific method is a cyclic process, when investigating a problem for the first time, you must start somewhere. W

Rina8888 [55]

Define the problem

Explanation:

The first step in a scientific investigation is to define the problem at hand. Definition of a scientific problem makes a scientific investigations possible.

When preliminary observations are made about a phenomenon. A lot of questions as to why such things occur will arise.
From the question, we can state the problem and the likely causes.
The first portal in an inquiry is problem definition.
This would them lead to the formulation of a hypothesis which contains problem statement and likely causes.
The hypothesis leads to the design of an experiment from which investigations using experiments can be done.
The data from the experiments are collected and analyzed.

Learn more:

Experiment brainly.com/question/5096428

#learnwithBrainly

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2 years ago

I need helpppppppppppppppppppppppppppppppppppp

11Alexandr11 [23.1K]

Answer:

Explanation:

Carbon dioxide in the air

7 0

2 years ago

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