a car traveling at 20 m/s starts to decelerate steadily it comes to a complete stop in 10s .what is its acceleration

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Answer 1

Answer:

A car traveling at 20 m/s starts to decelerate steadily it comes to a complete stop in 10s. The equation for the acceleration is velocity divided by time. So divide 20 m/s by 10 s and you will get an acceleration of 2 m/s2.

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Which reaction does not occur?2HF(aq) + Cl2(g) → F2(g) + 2HCl(aq)
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Answers

Answer: $2HF(aq)+Cl_2(g)\rightarrow F_2(g)+2HCl(aq)$ will not occur.

Explanation:

A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution. Thus one element should be different from another element.

A general single displacement reaction can be represented as :

$X+YZ\rightarrow XZ+Y$

a) $2HF(aq)+Cl_2(g)\rightarrow F_2(g)+2HCl(aq)$

Flourine is more reactive than chlorine and hence this reaction cannot occur.

b) $2Na(s)+ZnF_2(aq)\rightarrow 2NaF(aq)+Zn(s)$

Sodium is more reactive than zinc and hence the reaction will occur.

c) $Fe(s)+CuCl_2(aq)\rightarrow FeCl_2(aq)+Cu(s)$

Iron is more reactive than copper and hence the reaction will occur.

d) $2HCl(aq)+Mg(s)\rightarrow MgCl_2(aq)+H_2(g)$

Magnesium is more reactive than hydrogen and hence the reaction will occur.

Is this a chemical or physical property;

Sandpaper is scratchy

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Physical because you can feel that the Sandpaper is scratchy.

That is a physical property

What are 3 toxicants associated with sewage?

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Final Answer:

Three toxicants associated with sewage are heavy metals, organic pollutants, and pathogenic microorganisms.

Explanation:

1. Heavy Metals: Sewage can contain heavy metals such as lead, mercury, and cadmium, which are often discharged into wastewater from industrial processes and urban runoff. These toxic metals can contaminate water bodies, accumulate in aquatic ecosystems, and pose significant health risks to both aquatic life and humans when consumed through contaminated water or seafood.

2. Organic Pollutants:*Sewage also contains a variety of organic pollutants, including pesticides, solvents, and synthetic chemicals. These substances can originate from household products, industrial discharges, and agricultural runoff. Organic pollutants can have adverse effects on aquatic ecosystems by disrupting the balance of the ecosystem, affecting water quality, and harming aquatic organisms.

3. Pathogenic Microorganisms: Sewage is a potential carrier of pathogenic microorganisms such as bacteria, viruses, and parasites. When sewage is improperly treated or discharged into water bodies without adequate disinfection, it can lead to the contamination of drinking water sources and recreational waters, causing waterborne diseases and infections in humans.

Proper sewage treatment and wastewater management are essential to minimize the release of these toxicants into the environment and protect human health and aquatic ecosystems.

Learn more about organic pollutants

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Answer:

Pathogens,Heavy Metal and Organic Chemicals are all three toxicants associated with sewage

What is the approximate hydronium ion concentration and hydroxide ion concentration in a cup of tea? Which is higher?

Answers

suppose pH = 5 then pOH = 14-5 = 9
[OH-] = 10^-pOH
= 10^-9
= 1.00x 10^-9
hope it helps

The negative log of hydrogen or hydronium ions concentration gives the pH of the solution. The concentration of hydronium is more than the hydroxide ions.

What are pH and pOH?

The pH of the solution is the concentration of the hydrogen or the hydronium ion in the aqueous solution, whereas the concentration of the hydroxide ion in the solution gives the pOH.

Let the pH of the tea = 5 then,

The concentration of hydronium ion is calculated as:

$\begin{aligned}\rm pH &=\rm -log[H_(3)O^(+)]\n\n\rm [H_(3)O^(+)] &= \rm 10^(-pH)\n\n&= 10 ^(-5)\end{aligned}$

The concentration of hydroxide ion is calculated as:

$\begin{aligned} \rm pH &= \rm 14 - pOH \n\n&= 14 - 5\n\n&= 9\end{aligned}$

Calculating further:

$\begin{aligned}\rm pOH &= \rm -log[OH^(-)]\n\n\rm [OH^(-)]& =\rm 10^(-pOH)\n\n&= 10^(-9)\end{aligned}$

Therefore, the concentration of the hydronium ion is much higher than that of the hydroxide ion.

Learn more about pH and pOH here:

brainly.com/question/10406150

Why is it incorrect to balance a chemical equation by changing the subscripts?

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the gas left in a ussd aerosol can is at a pressure of 103kPa at 25.0 °C. if the can heats up to 50.0°C what is the pressure of gas inside the can assuming the volume of the can is constant

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75.0°C all you had to do was add them up

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