All categories

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....

You might be interested in

50.0 mL of an HNO3 solution were titrated with 36.90 mL of a 0.100 M LiOH solution to reach the equivalence point. What is the m

Xelga [282]

Following reaction takes place between LiOH and HNO3

LiOH + HNO3 → LiNO3 + H2O

Thus, 1 mole of LiOH reacts with 1 mole of HNO3 to form 1 mole of LiNO3.

Now,
Number of millimoles of LiOH consumed = 36.90 X 0.100 = 3.690

∴Number of millimoles of HNO3 present = 3.690

Now, Molarity of HNO3 = $\frac{\text{number of millimoles of HNO3}}{\text{volume of solution (ml)}}$
= $\frac{3.690}{50}$ = 0.0738 M

Thus, molarity of the HNO3 solution is 0.0738 M

8 0

3 years ago

Substance/Specific heat capacity

nikdorinn [45]

I believe it is aluminum

8 0

3 years ago

Read 2 more answers

You have a substance and begin a set of experiments in which you break it down into other substances through chemical reactions.

a_sh-v [17]

They're elements. Elements are the simplest form of any substance that cannot be broken down by any chemical methods, including electrolysis or even heat. Examples include oxygen, hydrogen etc.

3 0

4 years ago

What mass of hydrochloric acid (in grams) can 2.7 g of sodium bicarbonate neutralize? (Hint: Begin by writing a balanced equatio

Julli [10]

Answer:

1.17 grams of HCl can neutralize 2.7 grams sodium bicarbonate

Explanation:

Step 1: Data given

Mass of sodium bicarbonate = 2.7 grams

Step 2: The balanced equation

HCl + NaHCO3 ⇔ NaCl + H2O + CO2

Step 3: Calculate moles NaHCO3

moles NaHCO3 =2.7 g / 84 g/mol= 0.032 moles

Step 4: Calculate moles HCl

For 1 mol NaHCO3 we need 1 mol HCl

For 0.032 moles NaHCO3 = 0.032 moles HCl

Step 5: Calculate mass HCl

Mass HCl = moles HCl * molar mass HCl

mass HCl = 0.032 * 36.46 g/mol= 1.17 grams

1.17 grams of HCl can neutralize 2.7 grams sodium bicarbonate

3 0

3 years ago

For which of the reactions listed below will Gibbs free energy always be

Vanyuwa [196]

Answer:

an exothermic reaction that Increase in entropy

3 0

3 years ago

Read 2 more answers