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uranmaximum [27]
3 years ago
15

Q # 6 which of the following equations has correct formulas and also is a balanced equation?

Chemistry
1 answer:
LuckyWell [14K]3 years ago
8 0

Answer:- a)   2Be+O_2\rightarrow 2BeO

First equation is correct since Be is an alkaline earth metal and it has +2 charge. Oxygen also has -2 charge so the formula of beryllium oxide is BeO. Since, oxygen is diatomic, it is written as O_2 and then to balance the equation we need to multiply Be and BeO by 2 and the balanced equation is:  2Be+O_2\rightarrow 2BeO

Second equation is not balanced for hydrogen and potassium. There was actually no need to multiply KCl and HCl by 3. It could simply be written as:

KCl+HNO_3\rightarrow HCl+KNO_3

Third equation is not correct as the product formula is wrong. Mg has +2 charge and O has -2 charge, so the product will be MgO and the balanced equation must be written as:

2Mg+O_2\rightarrow 2MgO

Fourth equation is not correct since metal carbonates gives metal oxide and the carbon dioxide gas on decomposition. Calcium carbonate and calcium oxide formulas are written correctly but the carbon dioxide formula is not written correctly. It must should be [tex[CO_2[/tex] where they have written CO_3  and the correct equation is written as:

CaCO_3\rightarrow CaO+CO_2


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A 28.5 gram piece of iron is added to a graduated cylinder containing 45.5 mL of water. The water in the cylinder rises to the 4
yan [13]

7.91 g/ml is the density of the iron piece of 28.5 gms.

Explanation:

The density of a substance is defined as the volume it occupies.  It tells the matter present in a substance.

The density is mass per unit volume and is denoted by p.

The formula for density is given by:

density (p) = \frac{mass}{volume}

Data given is :

mass= 28.5 grams

V1 = 45.5 ml

V2= 49.1 ml

The initial volume of water was 45.5 ml, when iron piece of 28.5 grams was added the final volume was 49.1 ml.

Putting the values in the equation of density

p = \frac{28.5}{49.1-45.5}

p = 7.91 g/ml

Since iron is a dense material it will occupy less volume

4 0
3 years ago
Analyses of enzymes found in the blood are used as indicators that tissue damage (heart, liver, muscle) has occurred and resulte
Reika [66]

Answer:

True.

Explanation:

Yes, analyses of enzymes found in the blood are used as indicators of tissue damage in the heart, liver, muscle etc has occurred. This leakage of enzymes into the bloodstream tells us whether the tissue is damaged or not. Lactate dehydrogenase is a type of enzyme which is used as indicator which is responsible for the interconverts lactate and pyruvate. The concentration of this enzyme in the blood tells us about tissue damage.

7 0
3 years ago
Read 2 more answers
The part of the flower responsible for producing pollen (sperm) is the _______.
IgorC [24]
Hello,

Here is your answer:

The proper answer to this question is option C "stigma".

Here is how:

The stigma is responsible for producing pollen in a plant.

Your answer is C.

If you need anymore help feel free to ask me!

Hope this helps!
7 0
3 years ago
Please help!! 20 points!! Posted this previously and forgot to change it to 20 points but it is now
spayn [35]

Answer:

0.571 mol

Explanation:

Given data:

Number of moles of NaHCO₃ = 0.571 mol

Number of moles of CO₂ produced = ?

Solution:

Chemical equation:

NaHCO₃ + C₃H₆O₃   →     CO₂  + C₃H₅NaO₃ + H₂O

Now we will compare the moles of CO₂ with NaHCO₃ from balance chemical equation.

                             NaHCO₃          :            CO₂

                                    1                :               1

                                 0.571            :            0.571

So number of moles of CO₂  produced are 0.571.

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