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2 years ago

Please help me! giving brainliest!!

Chemistry

2 answers:

Dima020 [189]2 years ago

8 0

Answer:

It is a covalent bond because both carbon and oxygen are nonmetals. The formula will be CO² because the electrons between the atoms are being shared equally.

amid [387]2 years ago

8 0

Answer:

Option C

Explanation:

CO₂ is a covalent bond because we know that both elements are nonmetals. The carbon atoms shares 2 electrons with each oxygen atom and each oxygen atom shares two electrons with the carbon atom. CO₂ forms a nonpolar covalent bond, meaning that the electrons are shared equally.

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A certain heat engine operates between 800 K and 300 K. (a) What is the maximum efficiency of the engine? (b) Calculate the maxi

Sholpan [36]

Answer :

(a) The maximum efficiency of the engine is, 62.5 %

(b) The maximum work done is, 0.625 KJ.

(c) The heat discharge into the cold sink is, 0.375 KJ.

Explanation : Given,

Temperature of hot body $T_h$ = 800 K

Temperature of cold body $T_c$ = 300 K

(a) First we have to calculate the maximum efficiency of the engine.

Formula used for efficiency of the engine.

$\eta =1-\frac{T_c}{T_h}$

Now put all the given values in this formula, we get :

$\eta =1-\frac{300K}{800K}$

$\eta =0.625\times 100=62.5\%$

(b) Now we have to calculate the maximum work done.

Formula used :

$\eta =\frac{Q_h-Q_c}{Q_h}=\frac{w}{Q_h}$

where,

$Q_h$ = heat supplied by hot source = 1 KJ

$Q_c$ = heat supplied by hot source

w = work done = ?

Now put all the given values in this formula, we get :

$\eta =\frac{w}{Q_h}$

$0.625=\frac{w}{1KJ}$

$w=0.625KJ$

(c) Now we have to calculate the heat discharge into the cold sink.

Formula used :

$w=Q_h-Q_c$

$Q_c=Q_h-w$

$Q_c=1-0.625$

$Q_c=0.375KJ$

Therefore, (a) The maximum efficiency of the engine is, 62.5 %

(b) The maximum work done is, 0.625 KJ.

(c) The heat discharge into the cold sink is, 0.375 KJ.

4 0

4 years ago

Sodium hydroxide is used extensively in acid-base titrations because it is a strong, inexpensive base. A sodium hydroxide soluti

NeX [460]

Answer: The molarity of the base solution is 0.22 M.

Explanation:

According to the neutralization law,

$n_1M_1V_1=n_2M_2V_2$

where,

$M_1$ = molarity of $HCl$ solution = 0.1994 M

$V_1$ = volume of $HCl$ solution = 38.87 ml

$M_2$ = molarity of $NaOH$ solution = ?

$V_2$ = volume of $NaOH$ solution = Final reading - Initial reading = 36.18 - 1.16 = 35.02 ml

$n_1$ = valency of $HCl$ = 1

$n_2$ = valency of $NaOH$ = 1

$1\times 0.1994\times 38.87=1\times M_2\times 35.02$

$M_2=0.22M$

Therefore, the molarity of the base solution is 0.22 M.

8 0

4 years ago

Read 2 more answers

Luis is helping his parents paint a border around the walls of a room. He uses a stencil to repeat the same design on each wall

iren [92.7K]

Answer:

Polymerization.

Explanation:

Polymerization can be defined as a type of chemical reaction in which molecules that are relatively small in size chemically combine to form a huge chain of molecules.

Simply stated, polymerization refers to a chemical reaction where two or more smaller molecules react to produce larger molecules of the same network or repetitive structural units.

In polymerization, the relatively small molecules are generally referred to as monomers while the larger molecules they produce are known as polymers.

Polymerization is given by the chemical formula;

nA -----> A(n).

In this scenario, Luis uses a stencil to repeat the same design on each wall to form one long grapevine with a bunch of grapes every foot along its length.

Hence, the type of chemical reaction this best model is polymerization because it involved repeating the same design (monomers) to form a long grapevine with a bunch of grapes (polymers).

5 0

3 years ago

According to the law of conservation of matter, what cannot change during a chemical reaction?.

skelet666 [1.2K]

Answer:The law of conservation of mass states that in a chemical reaction mass is neither created nor destroyed. ... The carbon atom changes from a solid structure to a gas but its mass does not change. Similarly, the law of conservation of energy states that the amount of energy is neither created nor destroyed.

Explanation:

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3 years ago

Ethanol is highly toxic if it is consumed in large quantities. Although it is the second least toxic of the five alcohols discus

Kobotan [32]

A significant MOE exists compared to developmental toxicity effect levels.

Blood alcohol levels from ABHS approximate consumption of non-alcoholic beverages.

No significant risk of developmental toxicity is expected from ABHS use.

Ethanol-based topical antiseptic hand rubs, commonly referred to as alcohol-based hand sanitizers (ABHS), are routinely used as the standard of care to reduce the presence of viable bacteria on the skin and are an important element of infection control procedures in the healthcare industry.

There are no reported indications of safety concerns associated with the use of these products in the workplace. However, the prevalence of such alcohol-based products in healthcare facilities and safety questions raised by the U.S. FDA led us to assess the potential for developmental toxicity under relevant product-use scenarios.

Estimates from a physiologically based pharmacokinetic modeling approach suggest that occupational use of alcohol-based topical antiseptics in the healthcare industry can generate low, detectable concentrations of ethanol in blood.

This unintended systemic dose probably reflects contributions from both dermal absorption and inhalation of the volatilized product.

Learn more about Ethanol at

brainly.com/question/5750283

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2 years ago