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3 years ago

Raw meat can spread pathogens. Which statement describes the best way to prevent the spread of foodborne illness?

Chemistry

2 answers:

blsea [12.9K]3 years ago

8 0

A. Use a paper towel to wipe off everything that the meat touched

Archy [21]3 years ago

7 0

C.) wash hands, utensils, and surfaces with hot soapy water

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SCIENCE - Can someone tell me the ph level of rain water?

amid [387]

Normal rainwater has a pH of 5.6<span> (slightly acidic)</span>

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3 years ago

When liquid gold becomes a solid, its particles get closer together. Which best describes what happened to the gold?

yanalaym [24]

Answer:

The rearrangement of particles in a physical change.

Explanation:

When things are liquid the particles tend to be spread out because they aren't tightly compacted as they would be with a solid. So when liquid gold is changing from a liquid to a solid the properties are changing and the particles in the gold are getting closer together.

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3 years ago

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What does it mean when someone calls you dense?

GenaCL600 [577]

Answer:

And if someone calls you dense, they think nothing can get into your thick skull. Dense comes from the Latin densus which means thick and cloudy. In general, the word means packed tight and gives the sense that something is difficult to get through.

Explanation: Look it up :)

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3 years ago

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Determine the heat of reaction for the process TiO2(s) + 4HCl(g) TiCl4(l) + 2H2(g) + O2(g) using the information given below: Ti

Aleks [24]

Answer : The heat of reaction for the process is, 1374.7 kJ

Explanation :

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

The main chemical reaction is,

$TiO_2(s)+4HCl(g)\rightarrow TiCl_4(l)+2H_2(g)+O_2(g)$ $\Delta H_{rxn}=?$

The intermediate balanced chemical reaction will be,

(1) $Ti(s)+O_2(g)\rightarrow TiO_2(s)$ $\Delta H_1=-939.7kJ$

(2) $2HCl(g)\rightarrow H_2(g)+Cl_2(g)$ $\Delta H_2=-184.6kJ$

(3) $Ti(s)+2Cl_2(g)\rightarrow TiCl_4(l)$ $\Delta H_3=-804.2kJ$

We reversing reaction 1, 3 and multiplying reaction 2 by 2 and then adding all the equations, we get :

(1) $TiO_2(s)\rightarrow Ti(s)+O_2(g)$ $\Delta H_1=939.7kJ$

(2) $4HCl(g)\rightarrow 2H_2(g)+2Cl_2(g)$ $\Delta H_2=2\times (-184.6kJ)=-369.2kJ$

(3) $TiCl_4(l)\rightarrow Ti(s)+2Cl_2(g)$ $\Delta H_3=804.2kJ$

The expression for heat of reaction for the process is:

$\Delta H_{rxn}=\Delta H_1+\Delta H_2+\Delta H_3$

$\Delta H_{rxn}=(939.7kJ)+(-369.2kJ)+(804.2kJ)$

$\Delta H_{rxn}=1374.7kJ$

Therefore, the heat of reaction for the process is, 1374.7 kJ

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3 years ago

What is the reaction quotient?

ikadub [295]

Answer:

A. It measures the [products] / [reactants].

Explanation:

The reaction quotient aids in figuring out which direction a reaction is likely to proceed, given either the pressures or the concentrations of the reactants and the products.
It is calculated from the concentration of the products and reactants at mixing up.

Reaction quotient (Q) = [products] / [reactants]

So, the right choice answer:

A. It measures the [products] / [reactants].

5 0

3 years ago