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Arisa [49]
3 years ago
13

When substances are different from the starting substances, ______ has occurred. a physical change a chemical change no change a

mass change
Chemistry
2 answers:
musickatia [10]3 years ago
5 0
A chemical change... But only if the process is irreversible
Nutka1998 [239]3 years ago
4 0

Answer : The correct option is, Chemical change.

Explanation :

Physical change : It is a change in which there is no new compound or substance is formed. In this, changes occurs only in the phase.  This change is reversible in nature.

For example : Water boiled  : It is a physical change because in this process only phase changes from liquid state to gaseous state.

Chemical change : It is a change in which a new or different compound or substance is formed and releases some amount of energy. There is no changes occurs in the phase. This change is irreversible in nature.

For example : Marshmallows browned  : It is a chemical change due to the burning of sugar. In the sugar burning process, sugar react with oxygen to give carbon dioxide and water as a product.

As per question, when the substances are different from the starting substances, chemical change has occurred.

Hence, the correct option is, Chemical change.

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What other kinds of empirical evidence can be used to show common ancestry among organisms?
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Answer:There are, however, other forms of empirical evidence that support the theory of evolution. The fossil record, anatomical and embryological homologous, and genetic similarities are also used to support the theory of evolution. Many pieces of evidence support the theory that birds and dinosaurs are related.

Explanation:hope i am helpful

4 0
3 years ago
Also need to know some of this stuff
irinina [24]

Answer:

answers are in attachment

Explanation:

1. Synthesis Reaction: In this type of reaction multiple reactant combine to form a single product.

2. Decomposition Reaction: In this type of reaction single compound or reactant break down into new elements or compounds.

3. Replacement Reaction: In this type of reaction an element replace an element in a compound.

4. Even hydrogen is not a metal but it can act as metal in single replacement reaction.

5. In combustion reaction fuel react with oxygen and give heat and light that increase temperature of surrounding.

6. In in-complete combustion reaction fuel react with in-sufficient oxygen and give carbon monoxide and carbon in form of soot.

7. Base is a compound that liberate OH⁻ ion in water.

8. indicators have different color in acid and base depends on pH of the solution

9. Salt and water are the product of neutralization reaction

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10. The pH of neutral solution is 7.  

6 0
3 years ago
When acetic anhydride is dissolved in water, it forms acetic acid according to the balanced chemical reaction shown below. calcu
melisa1 [442]

2(CH3)2O3 + 2H2O   --->   4 CH3COOH  is the balanced equation.


6 0
3 years ago
BRAINLIESTTT ASAP!!!
mote1985 [20]

Answer:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 4p²

Explanation:

This atom will likely have 4 electron shells denotation of – 2.8.8.4

Orbitals shells show the probability, in space around the nucleus, where to find an electron. It is important to note that the 3rd shell has an additional d orbital (-in addition to s and p). However, because the d orbital has a higher energy state than the 4s and 4p orbitals, the d orbital only fills up when these latter ones are completely filled. In this case, the 4p does not completely fill (hence we don't see the d orbital in the notation).

4 0
3 years ago
1. Why do scientists use a standard measurement system?
Margaret [11]

Answer:

Explanation:

1.Scientists use a shared system for reporting measurements called the International System of Units (SI). We use common measurement systems because science involves a lot of replication to confirm results. The most common system used in science is the metric system.

2.m, kg, m^3

3. g value change

3 0
3 years ago
Read 2 more answers
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