1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
alekssr [168]
4 years ago
8

Which reactions performed in the experiment involved chemical changes?

Chemistry
2 answers:
Anvisha [2.4K]4 years ago
5 0
A chemical reaction is a process that leads to the transformation of one set of chemical substances to another. Classically, chemical reactions encompass changes that only involve the positions of electrons in the forming and breaking of chemical bonds between atoms, with no change to the nuclei (no change to the elements present), and can often be described by a chemical equation.
yuradex [85]4 years ago
4 0

Answer:

2,4,6,7,8

Hope this helps

You might be interested in
If 16.9 kg of Al2O3(s), 57.4 kg of NaOH(l), and 57.4 kg of HF(g) react completely, how many kilograms of cryolite will be produc
hodyreva [135]

Answer: 69.72 kg of cryolite will be produced.

Explanation:

The balanced chemical equation is:

Al_2O_3(s)+6NaOH(l)+12HF(g)\rightarrow 2Na_3AlF_6+9H_2O

To calculate the moles, we use the equation:

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

moles of Al_2O_3 = \frac{16.9\times 1000g}{102g/mol}=165.7moles

moles of NaOH = \frac{57.4\times 1000g}{40g/mol}=1435moles

moles of HF = \frac{57.4\times 1000g}{20g/mol}=2870moles

As 1 mole of Al_2O_3 reacts with 6 moles of NaOH

166 moles of  Al_2O_3 reacts with = \frac{6}{1}\times 166=996 moles of NaOH

As 1 mole of Al_2O_3 reacts with 12 moles of HF

166 moles of  Al_2O_3 reacts with = \frac{12}{1}\times 166=1992 moles of HF

Thus Al_2O_3 is the limiting reagent.

As 1 mole of Al_2O_3 produces = 2 moles of cryolite

166 moles of  Al_2O_3 reacts with = \frac{2}{1}\times 166=332 moles of cryolite

Mass of cryolite (Na_3AlF_6) = moles\times {\text {molar mass}}=332mol\times 210g/mol=69720g=69.72kg

Thus 69.72 kg of cryolite will be produced.

8 0
3 years ago
1) Which New York State landscape region is located at 42 N, 75 W?
denis23 [38]

Answer:C) the Catskills

Explanation:

8 0
3 years ago
Is this reversible? “ it was silver in color at start but it burned brightly and formed a white powder after heating.”
NARA [144]

Hey there!

This is not reversible.

We know that this is a chemical change because heat is released (it burned brightly) and it formed a new substance (white powder).

Chemical changes are usually not reversible.

Since this is a chemical change, then this is not reversible.

Hope this helps!

3 0
3 years ago
A chemical change occurs when two or more substances join to form new substances with new ______________ properties
ivanzaharov [21]

Answer:

hope this helps!

Explanation:

In a chemical change, the atoms in the reactants rearrange themselves and bond together differently to form one or more new products with different characteristics than the reactants. When a new substance is formed, the change is called a chemical change

5 0
3 years ago
Read 2 more answers
Help me please !!! I need this question as soon as possible help !!!!!!!
IRISSAK [1]

Answer:land, crust, magma and core

Explanation:

8 0
3 years ago
Read 2 more answers
Other questions:
  • What hypothesis led to the discovery of the proton?
    15·2 answers
  • If my boyfriend asked me out on October 19 when will my one month be ?
    9·2 answers
  • How many milliliters of hydrogen gas are produced by the reaction 0.020 mol of magnesium with excess of hydrochloric acid at STP
    6·1 answer
  • How many atoms are in lead (III) bicarbonate?
    7·1 answer
  • How do most cells in your body sense their surroundings?
    7·1 answer
  • Explain why crystallisation can't be used to prepare calcium carbonate.​
    5·1 answer
  • Represente lo que ocurre mediante flechas cuando dos cargas negativas, dos cargas positivas y una carga positiva y otra negativa
    10·1 answer
  • What is the mass of the steel block?
    7·2 answers
  • dding a small amount of strong acid to a buffer solution will cause the ph to increase slightly. true false
    8·1 answer
  • The Development and Characterization of Carbon Nanofiber/Polylactic Acid Filament for Additively Manufactured Piezoresistive Sen
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!