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Makovka662 [10]
3 years ago
6

What are observations that indicate a chemical change has occurred ?

Chemistry
1 answer:
sukhopar [10]3 years ago
4 0

Answer:

Change of odor

Change of color

Change in temperature

Change in energy

Change of composition

Formation of gases

The decomposition of organic matter

The Change is irreversible

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3 Cu + 8HNO3 --> 3 Cu(NO3)2 + 2 NO + 4 H2O
Zepler [3.9K]

Answer:

A shape has 2 pairs of parallel sides and no right angles. What shape is it?

Trapezoid

Parallelogram

Square

RectangleA shape has 2 pairs of parallel sides and no right angles. What shape is it?

Trapezoid

Parallelogram

Square

Rectangle

Explanation:

A shape has 2 pairs of parallel sides and no right angles. What shape is it?

Trapezoid

Parallelogram

Square

Rectangle

7 0
2 years ago
After the solution reaches equilibrium, what concentration of zn2 (aq remains?
Fantom [35]
According to sources, the most probable answer to this query is that when solutions reaches equilibrium, the amount of concentration of two or more matter combined in this solution becomes equal. 

Thank you for your question. Please don't hesitate to ask in Brainly your queries. 
8 0
3 years ago
Some growth regulators are useful to farmers and gardeners.<br> O True<br> O False
lisov135 [29]

Answer:

True

Explanation:

The first artificial use of a PGR was to stimulate the production of flowers on pineapple plants. They are now used widely in agriculture. Plant hormones are also used in turf management to reduce the need to mow, to suppress seedheads, and to suppress other types of grass.

3 0
3 years ago
A patient needs to take 875mg twice daily The pills in the bottle are each 250mg How many pills does she wants to take 875mg
Angelina_Jolie [31]

Answer:

3.5 pill need to taken for completing dosage of 875 mg

Explanation:

Total dosage of medicine to be taken in a day

= 2 * 875 \\= 1750mg

Total weight of one pill = 250 mg

Number of pills required is equal to total dosage of medicine divided by the weight of one pill.

Hence,

Number of pills

= \frac{875}{250} \\= \frac{175}{50} \\= \frac{35}{10} \\= 3.5

6 0
3 years ago
The nucleus is held closely together by?
Hoochie [10]

The nucleus of an atom is held together by the strong nuclear force to hold together protons and neutrons. The strong nuclear force is stronger than electricity and gravity. It's even the strongest out of the four fundamental forces.

7 0
3 years ago
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