CHEMISTRY MIDDLE SCHOOL

What is the balanced chemical equation for the reaction between Hydrochloride acid and calcium carbonate when the products of the reaction are calcium chloride Carbon Dioxide and water

Answers

Answer 1
Answer:

Answer: 2HCl + CaCO3 => CaCl2+ CO2 + H2O

Explanation:

The equation is now balanced.

2 atoms H in both reactant and product side.

Cl have 2 atoms on both sides.

Ca have 1 atom in both sides.

C have 1 atom on both sides and

O have 3 atoms on both reactant and product side

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Consider the reaction below. 2Al2O3 4Al + 3O2 How many moles of oxygen are produced when 26.5 mol of aluminum oxide are decomposed? 17.7 mol19.9 mol39.8 mol53.0 mol

Answers

2 Al2O3 = 4 Al + 3 O2

2 moles Al2O3 ------------ 3 moles O2
26.5 moles ----------------- moles O2

moles O2 = 26.5 * 3 / 2

moles O2 = 79.5 / 2 => 39.8 moles O2

Answer : C . ) 39.8 Is The Correct Answer

Use ice wedging in a sentence

Answers

well the term is this :Ice wedging occurs when water seeps into cracks in rocks and freezes.

sooo hmm...
maybe this : Ice wedging is a type of erosion

I hope this helps a little ! :)

Answer:

The rock was larger than last summer, ice wedging caused it to expand.

Explanation:

Ice wedging is a process that happens when water gets into the cracks of concrete, stones, other forms of the Earth, and freezes. When the water freezes, it expands and pushes the rock from the crack which either separates and turns it into two rocks, or the rock might form together again and just be a larger rock. This process happens in Winter and usually finished in Spring when the ice between the rocks melt. I have described the process of ice wedging for you.

Conclusions related to historical events are limited to subjective evaluation of the existing evidence because _____. they cannot be repeated they don't need to be tested hypotheses cannot be developed that is good enough

Answers

This is not actually a chemistry question but okay:

Conclusions related to historical events are limited to subjective evaluation of the existing evidence because they cannot be repeated. 

Answer:

they cannot be repeated

Explanation:

A historical event can not be repeated so that it is possible to study it. For this reason, when studying a historical event it is necessary to search for documents that speak about that event in a consensual way. For this reason, we can see that the conclusions related to historical events are limited to the subjective evaluation that will vary according to the judgment of each person.

is it true or false that all atom´s electrons can interact with the electrons of other atom to form bonds

Answers

false. only valence electrons can bond with other atoms' electrons.

the problem say what is the volume (in kL) of 3.7505 x 10^4 mg of iron? Iron has a density of 7.87 g/ml. Use correct significant figures

Answers

so first find the volume

so 7.78g/ml and (3.7505 times 10^4) grams
therefor we dividde (3.7505 times 10^4) by 7.78 and get how many ml

the answer is 4820.69 ml

kL means kilo lieters
kilo=1000
kL=1000Liters
ml=milileters=1/1000 leiter
1000ml=1L
therfor
1kL=1000L
1000L=1000 times (1000ml)
1000L=1,000,000ml
1kL=1,000,000ml

so to convert to kL divide 4820.69 by 1,000,000
0.00482069
convert to scientifiic notation
4.8 times 10^-3

the answer is 4.8 times 10^-3 kL

Which of the following is true for a reliable scientific source

Answers

Answer:

As the options for the question not given, lets try to answer this question generally.

Explanation:

A reliable source can be described as an authentic source which proves or declines an action, research etc.

The most reliable source for scientific information is scientific papers. This is because scientific papers are subjected to peer- review and hence been tested and validated. A peer-review can be described as a judgement or test made by a person on other peoples research, both of the people having equal caliber.

Answer:

It cites valid data because a reliable scientific source needs data to back up what they’re proving.

Explanation:
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