All categories

2 years ago

Evaluate each scenario to determine whether it represents a chemical reaction.

Chemistry

2 answers:

vova2212 [387]2 years ago

8 0

Explanation:

A chemical reaction is one in which a chemical change occurs.

During a chemical change;

The process is irreversible
New kinds of matter produced
There is a change in mass

Based on these premise;

Baking cake batter is a chemical reaction because you cannot reverse the process

Shredding a paper is not a chemical reaction because no new kind of matter is produced.

Twisting of a metal wire is not a chemical reaction

Yellowing of newspaper in sunlight is a chemical change. The process cannot be reversed

Arada [10]2 years ago

3 0

Answer:

1. yes 2. no 3.no 4.yes

Explanation:

You might be interested in

Magnesium carbonate decomposes on heating to form magnesium oxide and carbon dioxide as shown.

lorasvet [3.4K]

C. 21.0g

that’s the aweeee

7 0

3 years ago

What is the process that changes one set of chemicals into another set of chemicals? A. cohesion B. hydrogen bonding C. chemical

diamong [38]

I think the correct answer from the choices listed above is option C. Chemical reaction is the process that changes one set of chemicals into another set of chemicals. In a chemical reaction, old bonds are broken down forming new bonds therefore new substances with new properties.

3 0

3 years ago

Read 2 more answers

Concentrated hydrogen peroxide solutions are explosively decomposed by traces of transition metal ions (such as Mn or Fe): 2H2O2

zalisa [80]

Answer:

23.0733 L

Explanation:

The mass of hydrogen peroxide present in 125 g of 50% of hydrogen peroxide solution:

$Mass=\frac {50}{100}\times 125\ g$

Mass = 62.5 g

Molar mass of $H_2O_2$ = 34 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus, moles are:

$moles= \frac{62.5\ g}{34\ g/mol}$

$moles= 1.8382\ mol$

Consider the given reaction as:

$2H_2O_2_{(aq)}\rightarrow2H_2O_{(l)}+O_2_{(g)}$

2 moles of hydrogen peroxide decomposes to give 1 mole of oxygen gas.

Also,

1 mole of hydrogen peroxide decomposes to give 1/2 mole of oxygen gas.

So,

1.8382 moles of hydrogen peroxide decomposes to give $\frac {1}{2}\times 1.8382 mole of oxygen gas. Moles of oxygen gas produced = 0.9191 molGiven: Pressure = 746 torr
The conversion of P(torr) to P(atm) is shown below:
[tex]P(torr)=\frac {1}{760}\times P(atm)$

So,

Pressure = 746 / 760 atm = 0.9816 atm

Temperature = 27 °C

The conversion of T( °C) to T(K) is shown below:

T(K) = T( °C) + 273.15

So,

T₁ = (27 + 273.15) K = 300.15 K

Using ideal gas equation as:

PV=nRT

where,

P is the pressure

V is the volume

n is the number of moles

T is the temperature

R is Gas constant having value = 0.0821 L.atm/K.mol

Applying the equation as:

0.9816 atm × V = 0.9191 mol × 0.0821 L.atm/K.mol × 300.15 K

⇒V = 23.0733 L

8 0

3 years ago

Increasing order of unsaturation

Basile [38]

Whats the question? Im not sure what your asking

7 0

3 years ago

True or false: the density of an object can be calculated by dividing its length by its width.

solong [7]

This is true!!!!!!!!!!!!!!!!!!!!!!!!

3 0

3 years ago

Read 2 more answers