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2 years ago

Weight measures

Chemistry

1 answer:

jasenka [17]2 years ago

5 0

Answer: D) The effect of gravity on an object

Explanation: We're not talking about mass, we're talking about weight. Weight is measured by the force of gravity on a object. For examples, you might be 100 pounds on Earth but 12 pounds on the moon.

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How many lone pairs of electrons in lewis structure of CH3 OH

Brums [2.3K]

There would be 2 which would be on the oxygen

4 0

2 years ago

Determine the resulting pH when 12mL if 0.16M HCl are reacted with 32 mL if 0.24M KOH.

TEA [102]

Answer:

pH = 13.1

Explanation:

Hello there!

In this case, according to the given information, we can set up the following equation:

$HCl+KOH\rightarrow KCl+H_2O$

Thus, since there is 1:1 mole ratio of HCl to KOH, we can find the reacting moles as follows:

$n_{HCl}=0.012L*0.16mol/L=0.00192mol\\\\n_{KOH}=0.032L*0.24mol/L=0.00768mol$

Thus, since there are less moles of HCl, we calculate the remaining moles of KOH as follows:

$n_{KOH}=0.00768mol-0.00192mol=0.00576mol$

And the resulting concentration of KOH and OH ions as this is a strong base:

$[KOH]=[OH^-]=\frac{0.00576mol}{0.012L+0.032L}=0.131M$

And the resulting pH is:

$pH=14+log(0.131)\\\\pH=13.1$

Regards!

3 0

2 years ago

Choose all the materials that S-waves cannot travel through.

crimeas [40]

Answer:

water

Explanation:

liquid don't have any shear strength and so a shear wave cannot propagate through a liquid.

6 0

1 year ago

Rank these species by their ability to act as an oxidizing agent. cu+ mg2+ fe2+

natita [175]

Explanation:

The species or elements which gain electrons and reduces itself are known as oxidizing agent or oxidant.

Ability of an element to act as an oxidizing agent depends on its electrode potential.

The electrode potential of $Cu^{+}$ is 0.52 V.

The electrode potential of $Fe^2+$ is -0.41 V.

The electrode potential of $Mg^{2+}$ is -2.38 V.

Greater is the value of electrode potential, stronger will be the oxidizing agent.

Therefore, rank of these species by their ability to act as an oxidizing agent are as follows.

$Cu^{+}$ > $Fe^2+$ > $Mg^{2+}$

7 0

2 years ago

A quantity of 85.0 mL of 0.900 M HCl is mixed with 85.0 mL of 0.900 M KOH in a constant-pressure calorimeter that has a heat cap

san4es73 [151]

Answer:

There is a 1:1 neutralization reaction, so, number of moles:

0.085 l * 0.900 mol/ L = 0.0765 mol HCL

The heat produced: 0.0765 mol * -56.2 kJ/mol = -4.229 kJ (this is the heat of neutralization)

Change in temperature: The mass to use in the equation Q=cmT.

4229 J / (4.186 J/gC*170 g) = 6.042 C

Add to the initial temperature:

18.24 + 6.042 = 24.29 C°

3 0

2 years ago