All categories

3 years ago

Which of these processes indicates that smelting copper is a chemical change?

2 answers:

8 0

it involves melting copper to form liquid metal. it involves heating charcoal to high temperatures. it involves drawing copper into long wires. it involves breaking molecular bonds between copper compounds.

Elan Coil [88]3 years ago

7 0

Answer:

AS ITS CANT BE REVERSED
IT IS PERMANEMT CHANGE
NEW SUBSTANCE FORMED
HEATING OS USED OR CHEMICAL REACTION.

You might be interested in

Lab Scenario D:

Cloud [144]

Answer:

See explanation

Explanation:

A reaction in which heat and light are produced is a combustion reaction. Combustion is said to have occurred when a substance is burnt in oxygen.

The balanced equation of the reaction is;

4Li(s) + O2(g) ------->2Li2O(s)

This reaction is exothermic because heat was produced. The reaction has a low activation energy as the metal easily burst into flames in oxygen. A catalyst is not needed in this reaction because it has a low activation energy.

According to the law of conservation of mass. Atoms are neither created nor destroyed in a chemical reaction. What this means is that in a chemical reaction, the number of atoms of each element on the left hand side must be the same as the same as the number of atoms of the same element on the right hand side.

3 0

3 years ago

How does a rock<br>Wither? Explain.

lesantik [10]

First, it combines with carbon dioxide in the soil to form a weak acid called carbonic acid. ... Carbonic acid slowly dissolves away minerals in rock, especially the carbonate minerals that make up limestone and marble. The weak acid decomposes the insoluble rock into watersoluble products that move into the groundwater.

3 0

3 years ago

A. filtration B. sieving C. using a magnet D. decantation

Vadim26 [7]

Answer:

Explanation:

1. Cornstarch and water - decantation

2. Iron and sulfur

3. Rice grains and stones - sieving

4. Pebbles and soil - decantation

5. Muddy water - decantation

6. Ground pepper and water - decantation

7. Flour and coarsely ground corn - sieving

8. Needles in a box of beads - using a magnet

9. Sesame seeds in soy sauce -

10. Pebbles and iron nails - using a magnet

11. Fine sand from rocks - sieving

12. Sand from water - filtration

13. Gravel and sand - sieving

14. Salt and iron filings - sieving

15. Pins from assorted buttons - using a magnet

16. Coconut oil from coconut milk - filtration

17. Sand and pebbles - sieving

18. Pasta from water - sieving

19. Sand and thumb tacks - using a magnet

20. Salt solution - filtration

8 0

3 years ago

What is the correct name for P4S3?

Rudik [331]

Answer:

The correct name for P₄S₃ is tetraphosphorous trisulfide or also known as phosphorous sesquisulfide.

Explanation:

P represents the element phosphorous.

S represents the element sulfur.

Since there is a 4 beside P, then we are going to use the prefix "tetra-". Since there is a 3 beside S, then we are going to use the prefix "tri-". We will also use the suffix "-ide" in sulfur because we are naming a compound with multiple elements.

So, P₄S₃ will be named tetraphosphorous trisulfide. When using more scientific terms, then the name of the compound is phosphorous sesquisulfide.

3 0

3 years ago

In humans carbon dioxide is excreted by _

Firdavs [7]

Explanation:

............... ...................................

4 0

3 years ago

Read 2 more answers