All categories

3 years ago

I really need help on this question please help

Chemistry

1 answer:

satela [25.4K]3 years ago

6 0

Answer:

Hazardous types: This type poses potential threats to the environment and human life.Battery wastes from thrown away technology.

Electronic waste or e-waste describe discarded electrical devices. Used electronics which are destined for refurbishment, resale, salvage recycling through material recovery, or disposal are also considered e-waste.

Hope this helped ! :)

You might be interested in

write a complete ionic equation and a net ionic equation for the reaction of aqueous solutions of calcium nitrate and iron (III)

maw [93]

3Ca(NO3)2(aq) +Fe2(SO4)3(aq)-----> 3CaSO4(s)+ 2Fe(NO3)3(aq)
3Ca²⁺ + 6 NO3 ⁻ +2 Fe ³⁺ +3SO4²⁻ -----> 3CaSO4(s)+2 Fe ³⁺+ 6 NO3 ⁻
3Ca²⁺+3SO4²⁻---->3CaSO4(s)
Ca²⁺+SO4²⁻---->CaSO4(s)

7 0

3 years ago

Which best describes the purpose of bar graphs?

Ymorist [56]

They compare quantities for particular cattle

3 0

3 years ago

Read 2 more answers

At STP, adding salt to a 200 mL sample of water produces a saturated 1.7 M solution. How many grams of salt (NaCl) must be added

Illusion [34]

Answer:

$m_{NaCl}=19.9gNaCl$

Explanation:

Hello!

In this case, since the formula for the calculation of molarity is:

$M=\frac{n}{V}$

Whereas we can compute the moles of the solute as shown below, making sure the volume is in liters:

$n=M*V$

Thus, by plugging in we obtain:

$n=0.200L*1.70mol/L=0.170molNaCl$

Next, since the molar mass of NaCl is 58.44 g/mol, we obtain the following mass:

$m_{NaCl}=0.170molNaCl*\frac{58.44gNaCl}{1molNaCl}\\\\m_{NaCl}=19.9gNaCl$

Best regards!

3 0

3 years ago

Sarah measures out 151 grams of SO2. How many moles is this? Express your answer to three significant figures.

Anna11 [10]

Answer:

$\boxed {\boxed {\sf 2.36 \ mol \ SO_2}}$

Explanation:

We are asked to convert grams to moles. We will use the molar mass and dimensional analysis to perform this conversion.

<h3>1. Molar Mass</h3>

The molar mass is the mass of 1 mole of a substance. These values are found on the Periodic Table because they are equivalent to the atomic masses, but the units are grams per mole instead.

We are given a mass of sulfur dioxide (SO₂). Look up the molar masses of the individual elements.

Sulfur (S): 32.07 g/mol
Oxygen (O): 15.999 g/mol

Notice that the formula of the compound contains a subscript. The subscript after O means there are 2 moles of oxygen in 1 mole of sulfur dioxide. We must multiply oxygen's molar mass before adding sulfur's.

O₂: 15.999 * 2 = 31.998 g/mol
SO₂= 32.07 + 31.998 = 64.068 g/mol

<h3>2. Convert Grams to Moles </h3>

Now we will use dimensional analysis to convert grams to moles. From the molar mass, we know there are 64.068 grams of sulfur dioxide per mole, so we can set up a ratio.

$\frac {64.068 \ g \ SO_2} {1 \ mol \ SO_2}$

We are converting 151 grams to moles, so we multiply by this value.

$151 \ g \ SO_2 *\frac {64.068 \ g \ SO_2} {1 \ mol \ SO_2}$

Flip the ratio so the units of grams of sulfur dioxide cancel.

$151 \ g \ SO_2 *\frac {1 \ mol \ SO_2}{64.068 \ g \ SO_2}$

$151 *\frac {1 \ mol \ SO_2}{64.068 }$

$\frac {151}{64.068 } \ mol \ SO_2$

$2.356870825 \ mol \ SO_2$

<h3>3. Round </h3>

The original measurement of grams (151) has 3 significant figures, so our answer must have the same. For the number we calculated, that is the hundredth place. The 6 in the thousandth place tells us to round the 5 in the hundredth up to a 6.

$2.36 \ mol \ SO_2$

151 grams of sulfur dioxide is approximately <u>2.36 moles of sulfur dioxide.</u>

8 0

3 years ago

Do Alkali Metal Compounds form precipitates? And Why?

Alexeev081 [22]

Answer:

Alkali metal hydroxides can be used to test the identity of metals in certain salts. The colour of the precipitate will help identify the metal : Calcium hydroxide is soluble; no precipitate is formed.

6 0

3 years ago