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PtichkaEL [24]
3 years ago
9

14. In groups, students create dioramas to depict different ecosystems and their physical characteristics. One of the dioramas i

s pictured Why are dioramas useful for studying environments? 5.3(C) E The model gives students an idea of how different environments appear G The diorama is a useful chart for Collecting data on environments A is e tool for measuring environmental changes Students can use a diorama to set up an investigation that tests one variable

Chemistry
1 answer:
Lena [83]3 years ago
3 0
The answer would be E, it shows students how the different environments appear, since you can visually see it.
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BALANCE the following equations then write the NET IONIC EQUATION for each one: ____Ni(NO​ 3​ )​ 2​​(aq)​ + ____NaOH ​(aq)​ ​→ ​
Karo-lina-s [1.5K]

Answer:

Ni(NO3)2 + 2NaOH → Ni(OH)2 + 2NaNO3

NET IONIC EQUATION :

Ni +2(aq)  + 2(NO3) -1(aq)  + 2Na +1(aq)  + 2OH -1(aq)

→ Ni(OH)2 (s)  + 2Na +1(aq)  +  2(NO3) -1(aq)

sorry there is no space to write the reaction in one line...

8 0
3 years ago
Read the chemical equation.
Sladkaya [172]

Answer:- D. 1.8 moles of Fe and 2.7molCO_2 .

Solution:- The balanced equation is:

Fe_2O_3+3CO\rightarrow 2Fe+3CO_2

let's first figure out the limiting reactant using the given moles and mol ratio:

1.8molFe_2O_3(\frac{3molCO}{1molFe_2O_3})

= 5.4 mol CO

From calculations, 5.4 moles of CO are required to react completely with 1.8 moles of Iron(III)oxide but only 2.7 moles of CO are available. It means CO is limiting reactant.

Products moles depends on limiting reactant. Let's calculate the moles of each reactant formed for given 2.7 moles of CO.

2.7molCO(\frac{2molFe}{3molCO})

= 1.8 mol Fe

2.7molCO(\frac{3molCO_2}{3molCO})

= 2.7molCO_2

So, the correct choice is D.  1.8 moles of Fe and 2.7molCO_2 are formed.

6 0
3 years ago
In nature, one common strategy to make thermodynamically unfavorable reactions proceed is to couple them chemically to reactions
padilas [110]

Answer:

\triangle G= -6.7 KJ/mol

Explanation:

From the question we are told that:

Chemical Reactions:

X=A⇌B,ΔG= 14.8 kJ/mol

Y=B⇌C,ΔG= -29.7 kJ/mol

Z=C⇌D,ΔG= 8.10 kJ/mol

Since

Hess Law

The law states that the total enthalpy change during the complete course of a chemical reaction is independent of the number of steps taken.

Therefore

Generally the equation for the Reaction is mathematically given by

T = +1 * X +1 * Y +1 *Z

Therefore the free energy, ΔG is

\triangle G=1 * \triangle G*X +1 * \triangle G*Y +1 * \triangle G *Z

\triangle G= +1 * (14.9) +1 * (-29.7) +1 * (8.10)

\triangle G= -6.7 KJ/mol

5 0
3 years ago
Determine which of these properties would distinguish these two substances: (a) boiling point; (b) combustion analysis results;
Nutka1998 [239]

Answer:

(a) boiling point

(d) density at a given temperature and pressure.

Explanation:

Isomers are compounds that have the same molecular formula but different structural formulas. They differ in chemical and physical properties depending on the type of isomerism displayed by the compounds.

The compounds stated here are structural or constitutional isomers hence they possess different boiling points and densities at a given temperature and pressure owing to structural differences in the molecules.

Since they have the same molecular formula, they must yield the same result during combustion analysis and they must have the same molecular weight.

3 0
3 years ago
If you refuse a legal chemical test issued by a law enforcement officer, the Division of Motor Vehicles is required to:
Andru [333]

Answer: Revoke the driver's license for at least 12 months

Explanation:

Chemical tests are used in order to measure the amount of drugs or alcohol that is in the body of a person when the person was arrested. To do this, samples of the urine or blood of the person can be taken and the result will be used to know if the person was driving under the influence of alcohol or not.

If the person refuse a legal chemical test issued by a law enforcement officer, the Division of Motor Vehicles is required to revoke the the driver's license of the person for at least 12 months.

6 0
3 years ago
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