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3 years ago

Brainliest given for an explanation why you think its that answer.

Chemistry

2 answers:

Kryger [21]3 years ago

8 0

Answer:c

Explanation:I think

TEA [102]3 years ago

6 0

Answer:

C. Classify

Explanation:

define classify :arrange a group into categories

this makes the most sense because it matches up with the sentence

for example "classify by eye color"

the green eyes would go together

the blue eyes would go together

the brown eyes go together

etc...

A. is not correct because.....

accuracy:being correct

this doesn't fit the sentence because its not talking about precise anywhere is the sentence given

B.is not correct because......

Critical thinking:Logical explanation

the sentence has nothing to do with thinking nor logic is involved

D is not correct because.....

Matter: physical substance

the sentence is not about science/physics

F is not correct because.....

Bias:Favor against one person

Although this sentence is about different categories based on your attributes it doesn't mention about favorites like "I like this catogory better"

pls mark me brainliest

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Which equation represents a conservation of atoms? Group of answer choices LaTeX: 4Fe\:+3O_2\:\longrightarrow\:2Fe_2O_3 4 F e +

slamgirl [31]

Answer : The equation represents a conservation of atoms is:

$4Fe+3O_2\rightarrow 2Fe_2O_3$

Explanation :

Law of conservation of matter : It states that matter can neither be created nor be destroyed but it can only be transformed from one form to another form.

The balanced chemical reaction always follow the law of conservation of matter.

Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.

(1) The given chemical reaction is,

$4Fe+3O_2\rightarrow 2Fe_2O_3$

This reaction is a balanced chemical reaction in which number of atoms of iron and oxygen are equal on the both side of the reaction. So, this reaction obey the law of conservation of matter.

(2) The given chemical reaction is,

$2Fe+2O_2\rightarrow 2Fe_2O_3$

This reaction is an unbalanced chemical reaction in which number of atoms of iron and oxygen are not equal on the both side of the reaction. So, this reaction does not obey the law of conservation of matter.

(3) The given chemical reaction is,

$4Fe+2O_2\rightarrow 2Fe_2O_3$

This reaction is an unbalanced chemical reaction in which number of atoms of oxygen are not equal on the both side of the reaction. So, this reaction does not obey the law of conservation of matter.

Hence, the equation represents a conservation of atoms is:

$4Fe+3O_2\rightarrow 2Fe_2O_3$

3 0

3 years ago

Oxidation number of Mg3N2

Fudgin [204]

Answer:

n=-3

Explanation:

Mg = +2

3(+2) + 2N = 0

N = -3

8 0

4 years ago

Calculate the root means square velocity of nitrogen molecules in 25 degrees Celsius

Mademuasel [1]

Calculate the root mean square velocity of nitrogen molecules at 25°C.
297 m/s
149 m/s
515 m/s
729 m/s

7 0

3 years ago

Calculate the frequency (in Hertz) of light with a wavelength of 420 nm. What color is the light?

BabaBlast [244]

Speed of light is 3.0*10^8
frequency = wavelength / speed
= 1400 Hz

3 0

3 years ago

A 25.0-mL sample containing Cu2+ gave an instrument signal of 25.2 units (corrected for a blank). When exactly 0.500 mL of 0.027

irga5000 [103]

Answer:

The molar concentration of Cu²⁺ in the initial solution is 6.964x10⁻⁴ M.

Explanation:

The first step to solving this problem is calculating the number of moles of Cu(NO₃)₂ added to the solution:

$C = \frac{n}{V} \\0.0275 = \frac{n}{0.0005} \\$

n = 1.375x10⁻⁵ mol

The second step is relating the number of moles to the signal. We know the the n calculated before is equivalent to a signal increase of 19.9 units (45.1-25.2):

1.375x10⁻⁵ mol _________ 19.9 units

x _________ 25.2 units

x = 1.741x10⁻⁵mol

Finally, we can calculate the Cu²⁺ concentration :

C = 1.741x10⁻⁵mol / 0.025 L

C = 6.964x10⁻⁴ M

7 0

3 years ago