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monitta
3 years ago
10

Which of the following statements is a qualitative observation? A.The branch is three meters long. B.The substance tastes bitter

. C.There are eleven students absent. D. The beaker contains four hundred milliliters of an unknown liquid.
Chemistry
1 answer:
notka56 [123]3 years ago
7 0

There are two kinds of analysis: qualitative and quantitative

In quantitative we analyse the amount of something that is how much of something is present / the quantity. Ex: the length of branch of tree, number of students in class, volume of a liquid in a beaker.

In qualitative analysis we determine the kind of substance / quality of substance / nature of substance.

like: colour of a substance, odor of a substance or taste (bitter / sour / sweet etc) of a substance

So answer is : B.The substance tastes bitter

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What is the chemical reaction for Mg + NaOH also with the ionic equations and subscripts?
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Read 2 more answers
A piece of unknown metal with mass 68.6 g is heated to an initial temperature of 100 °C and dropped into 8.4 g of water
Nookie1986 [14]

Answer:

The metal has a specific heat of 0.34333 J / g °C

Explanation:

The amount of heat lost by the metal is equal to the amount heat won by the water

q(lost, metal) = q(gained, water)

<u>Step 1: Given data</u>

q = m*ΔT *Cp

⇒with m = mass of the substance

⇒with ΔT = change in temp = final temperature T2 - initial temperature T1

⇒with Cp = specific heat (Cpwater = 4.184J/g °C) (Cpmetam = TO BE DETERMINED)

mass of the metal = 68.6g

mass of the water = 8.4g

initial temperature metal = 100°C

final temperature metal = 52.1°C

initial temperature water = 20°C

final temperature water = 52.1 °C

Specific heat of water = 4.184 J/g °C

<u>Step 2</u>:

For this situation : we get for q = m*ΔT *Cp

q(lost, metal) = q(gained, water)

- mass of metal(ΔT)(Cpmetal) = mass of water (ΔT) (Cpwater)

-68.6 * (52.1 - 100) * Cpmetal = 8.4g * (52.1 - 20) * 4.184 J /g °C

-68.6 * (-47.9) * Cpmetal = 1128.17

Cpmetal = 1128.17 / (-68.6 *-47.9) = 0.34333 J / g °C

The metal has a specific heat of 0.34333 J / g °C

6 0
3 years ago
The diagram below represents a plan cell Letter X represents a structure in the cell ​
weeeeeb [17]

the cell structure represented by x is the nucleus

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