How many atoms are in Na2CrO4

Answers

Answer 1

Answer:

We have that for the Question "how many atoms are in Na2CrO4" it can be said that The total number of atoms is

X=7 atoms

From the question we are told

how many atoms are in Na2CrO4

Generally

In identifying the atoms are in Na2CrO4 we must first look closely at the compound Na2CrO4

We have

Na=1

Cr=2

O=4

Therefore

The total number of atoms is

X=1+2+4

X=7 atoms

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Answer 2

Answer: The formula shows the number of each type of atom in the molecule. There are 2 atoms of sodium, one atom of chromium and four atoms of oxygen, being a total number of 7 atoms.

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What can fossils tell us about movements of the plates in the past

Answers

It can tell us how old they are and how and where they moved in the past.

It will tell you what continents were together in the past...

How long would it take for a car to travel 200km if it has an aventage speed of 55 km/ hr

Answers

Answer: 3.64 hours

Explanation:

Formula of Average speed : $\text{Average speed}=\frac{\text{Distance}}{\text{Time}}$

Given : Distance = 200km ; Average speed = 55 km/ hr

To find : Time

Substitute values for distance and average speed in the above formula , we get

$55=\frac{200}{\text{Time}}\n\n\Rightarrow\text{Time}=(200)/(55)=3.63636363636\approx3.64\ hr$

Hence, it would take 3.64 hours for a car to travel 200km .

The explosion of fuel in an automobile engine cylinder is an example of to energy.

Answers

Answer:

chemical to heat energy

Explanation:

How do you solve for limiting reagent with a balanced chemical equation? What are the steps?

Answers

Balance first the chemical equation given if it's unbalance before moving on to first step of mathematical computation.

Why are some examples of a chemical reaction not actually foolproof evidence that of a chemical reaction?13, 8th grade, and I'm doing my science lab report: The lab was a chemistry lab. We got a bunch of toxic chemicals and put pairs of them together, recorded the reactions, and wrote balanced equations for each of them and identified what kind of reaction they were. The whole name of the lab is "Evidence of Chemical Reactions", and one of the first analysis questions is "write a paragraph about the kinds of changes you would expect to see if a chemical reaction occurs." I answered this with things like bubble formation, change of color, change of state of matter, etc. Then the next question said "any one of these signs is not always a fool proof indication that a chemical reaction is occurring. give two examples to support this statement."
what are two examples to support the statement that the commonly known examples of chemical reactions occurring are not always foolproof evidence that chemical reactions are occurring?

Answers

So basically, the change in color effects the amount of cations in the solution making it a physical change rather than a chemical one, defying the law of conservation of mass! I hope this helped! (The only time the change in color affects the amount of cations is in the Alkaline Earth Metals)

source: college science teacher

Bubble formation, change of color, and change of state are not foolproof evidence of a chemical reaction due to physical changes and variations in the reactions.

While bubble formation, change of color, and change of state of matter are commonly associated with chemical reactions, they are not always foolproof evidence. Two examples to support this statement are:

Physical changes can mimic some of these signs. For example, the melting of ice is a change of state, but it is a physical change rather than a chemical reaction.
Some chemical reactions may not produce the expected signs. For instance, some reactions may be slow or occur at very low concentrations, making it difficult to observe noticeable changes.

Therefore, it is important to consider multiple lines of evidence and conduct further analysis to confirm the occurrence of a chemical reaction.

Learn more about Evidence of a Chemical Reactions here:

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Explain why burning is a chemical change in wood

Answers

The carbon element in wood reacts to the oxygen so it creates, energy as we all know as light and heat, ashes, and smoke. Hope this helps!

It is a chemical change in wood because a chemical change is when some object is being changed. So when fire burns on wood it changes how the wood is. The wood goes from whole to ash dust. Hope I could help. ;-)

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