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Vladimir [108]
4 years ago
10

These questions mess me up badly

Chemistry
1 answer:
harkovskaia [24]4 years ago
7 0
An element is a pure substance that has not been combined with anything, whereas a compound is something that is made of two or more substances (elements). an element would be Gold, and Silver, and a compound would be table salt or water.

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Calculate the molarity of a solution prepared by dissolving 12.5 g of Na2CrO4 in enough water to produce a solution with a volum
gregori [183]

Answer:

0.0953M

Explanation:

First, let us calculate the number of mole present in 12.5g of Na2CrO4.

Molar Mass of Na2CrO4 = (23x2) + 52 +(16x4) = 46 + 52 +64 = 162g/mol

Mass of Na2CrO4 = 12.5g

Number of mole =?

Number of mole =Mass /Molar Mass

mole of Na2CrO4 = 12.5/162 = 0.0772mol

Now, we can calculate for the molarity as follows:

Mole = 0.0772mol

Volume = 810mL = 810/1000 = 0.81L

Molarity =?

Molarity = mole /Volume

Molarity = 0.0772mol/0.81L

Molarity = 0.0953M

4 0
3 years ago
3. List the temperatures in order from warmest to
amid [387]

Answer:

3°F, 0°F, -11°F,  -16°F, -20°F

Explanation:

The Fahrenheit scale is a temperature scale proposed in 1724  by the physicist Daniel Fahrenheit.

In this scale:

- The freezing point of water is set at 32 degrees

- The boiling point of water is set at 212 degrees

One degree in the Fahrenheit scale is indicated with the symbol ^{\circ}F.

The equivalence between temperature in Celsius degrees and Fahrenheit degrees is as follows:

T(^{\circ}C)=\frac{5}{9}(T(^{\circ}F)-32) to convert from Fahrenheit to Celsius

T(^{\circ}F)=\frac{9}{5}(T(^{\circ}C)+32) to convert from Celsius to Fahrenheit

The Fahrenheit  scale is an increasing monotonic scale, it means that temperature goes from negative values towards positive values without interruption. Therefore, the temperatures listed from warmest to coldest are:

3°F, 0°F, -11°F,  -16°F, -20°F

8 0
4 years ago
Give me an atom with the following characteristics:
guajiro [1.7K]

Explanation:

Lanthanide series= E4

Boron=Si

Chalogen=O

Alkaline Earth metal =M9

4 0
3 years ago
What is the pH of a solution with [H+] of 1x10^-8 M?*<br> 15<br> -8<br> 8<br> 80
Serga [27]

Answer:

<h2>8</h2>

Explanation:

The pH of a solution can be found by using the formula

pH = - log [ {H}^{+} ]

From the question we have

ph  =  -  log(1 \times  {10}^{ - 8}  )  \\  = 8

We have the final answer as

<h3>8 </h3>

Hope this helps you

3 0
3 years ago
The prefix milli- means<br><br> 103<br> 10-2<br> 10-3<br> 102
lesantik [10]
Milli<span>- (symbol m) is a unit </span>prefix<span> in the metric system denoting a factor of one thousandth (10</span>−3<span>). Proposed in 1793 and adopted in 1795, </span>the prefix<span> comes from the Latin mille, </span>meaning<span> "one thousand" (the Latin plural is milia).</span>
3 0
4 years ago
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