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3 years ago

When substances change into new substances, the process must involve:

Chemistry

2 answers:

erastovalidia [21]3 years ago

4 0

Answer is a chemical change.

As a result of a chemical reaction, a substance is changed into new substances which involves a chemical change.

During a chemical reaction, atoms of a molecule within a substance are rearranged into different combinations by combining with the atoms of another substance to form new substances.

An example of a chemical change is the composition of sodium chloride (salt) where the atoms of sodium and chlorine combine and rearrange themselves to form salt.

Andrej [43]3 years ago

3 0

A chemical change....

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Calculating kinetic energy 1200kg car moving at 10

valkas [14]

Answer:

60000J

Explanation:

Given parameters:

Mass of car = 1200kg

Speed = 10m/s

Unknown:

Kinetic energy = ?

Solution:

The kinetic energy is given as:

Kinetic energy = $\frac{1}{2}$ m v²

Now insert the parameters and solve;

m is the mass

v is the velocity

Kinetic energy = $\frac{1}{2}$ x 1200 x 10² = 60000J

6 0

3 years ago

Which is a base-conjugate acid pair? NH3 and CIO

ozzi

Answer:

The pair will be:

- NH3/NH4⁺

- ClO⁻/HClO

Explanation:

A conjugate acid is formed after a base has reacted/accepted a proton.

Since H2O is amphiprotic, we can use it as the acid.

NH3 + H2O ⇄ NH4⁺ + OH⁻

ClO⁻ + H2O ⇄ HClO + OH⁻

after reacting, the base form conjugate acid.

8 0

3 years ago

Photosynthesis reactions in green plants use carbon dioxide and water to produce glucose (C6H12O6) and oxygen. A plant has 88.0

grandymaker [24]

The given question is incomplete. The complete question is:

Photosynthesis reactions in green plants use carbon dioxide and water to produce glucose (C6H12O6) and oxygen. A plant has 88.0 g of carbon dioxide and 64.0 g of water available for photosynthesis. Determine the mass of glucose (C6H1206) produced

Answer: 60.0 g of glucose

Explanation:

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}$

a) moles of $CO_2$

$\text{Number of moles}=\frac{88.0g}{44g/mol}=2.0moles$

b) moles of $H_2O$

$\text{Number of moles}=\frac{64.0g}{18g/mol}=3.5moles$

$6CO_2+6H_2O\rightarrow C_{6}H_{12}O_6+6O_2$

According to stoichiometry :

6 moles of $CO_2$ require = 6 moles of $H_2O$

Thus 2.0 moles of $CO_2$ require= $\frac{6}{6}\times 2.0=2.0moles$ of $H_2O$

Thus $CO_2$ is the limiting reagent as it limits the formation of product.

As 6 moles of $CO_2$ give = 1 moles of glucose

Thus 2.0 moles of $CO_2$ give = $\frac{1}{6}\times 2.0=0.33moles$ of glucose

Mass of glucose = $moles\times {\text {Molar mass}}=0.33moles\times 180g/mol=60g$

Thus 60.0 g of glucose will be produced from 88.0 g of carbon dioxide and 64.0 g of water

8 0

3 years ago

)- symbols following elements silver, Copper ,magnesium ,sulphur

NNADVOKAT [17]

Ag,Cu,Mg,S are the answers...............

3 0

3 years ago

Read 2 more answers

Does the mass of the sealed jar and its contents change upon the vaporization of the liquid?

Norma-Jean [14]

The answer is No. That is the mass of the sealed jar and its contents does not change upon the vaporization of the liquid, as according to the “law of conservation of mass” , the mass remain conserved when no matter is escape, the mass will remain constant and here also as the jar is sealed, no matter is escaped thus no mass change will be there.

4 0

4 years ago