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Vinvika [58]
2 years ago
5

(HELP FAST)Which of the following always changes when a substance undergoes a chemical change?

Chemistry
2 answers:
Lera25 [3.4K]2 years ago
7 0
I’m pretty sure it’s a
GrogVix [38]2 years ago
3 0
A- the change of matter
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What is the correct formula for combining Mg2+ and Br1+
True [87]

Answer: The correct formula is MgBr_2

Explanation:

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.  

Here magnesium is having an oxidation state of +2 called as Mg^{2+} cation and bromine Br^{-} is an anion with oxidation state of -1. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral MgBr_2.

The cations and anions being oppositely charged attract each other through strong coloumbic forces and form an ionic bond.

6 0
2 years ago
Calculate the average reaction rate of Cl2 consumed using the following information. H2 + Cl2 yields 2 HCl A table with three co
klemol [59]
Answer : Option D) 2.50 X 10^{-3} Mol/(L s)

Explanation: While calculating the average reaction rate for the given reaction in terms of Cl;

H_{2} + Cl_{2}  ----\ \textgreater \  2HCl.

using the rate equation which is;

\frac{-1}{1}\frac{delta [Cl]}{delta t} = 

\frac{- 0.0875 - 0.0625}{10s - 0s} = 2.50 X 10^{-3} Mol/(L s)
5 0
3 years ago
How old is the universe
ehidna [41]
13.8 billion years old
5 0
2 years ago
Read 2 more answers
What is the difference between a subsurface and a surface event? List an example of each from the rock cycle.
GenaCL600 [577]

Answer:

The events in the rock cycle can be divided into categories:

a) Surface Events

These are the changes that occur on the surface of the earth. This includes weathering and erosion

Igneous Rocks

b) Subsurface Events

These are the changes in the cycle that occur in the inner surface of our planet. This is under the surface of Earth. This includes process like plate tectonics and mountain building.

Sedimentary

4 0
3 years ago
Gerald's science teacher mixed room temperature samples of hydrochloric acid and sodium hydroxide in a large beaker. The solutio
Rama09 [41]

Answer:

A.

A chemical reaction was producing a new substance.

Explanation:

Equation of the reaction

NaOH + HCl --> NaCl + H2O

Heat of neutralization is the amount of heat evolved when one mole of acid reacts with one mole of an alkaline to form one mole of water.

When a neutralisation reaction is carried out, there is an exothermic change; energy released into the surroundings therefore since heat is given out which is what is felt.

8 0
3 years ago
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