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3 years ago

Which of these statements is true?

Chemistry

2 answers:

creativ13 [48]3 years ago

8 0

I believe B. Is true, that some elements that are found In nature exist as molecules.

vichka [17]3 years ago

3 0

All molecules are made up of atoms. N2 O2 and H2 exist in molecule form and not in atomic form.
They exist freely in nature as molecules.
According to above explanation,
B. Some elements found in nature exist as molecules, is the correct answer.

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What mass of NaCl would you have dilute to 1L to make up a 0.25M solution? Asap please

gavmur [86]

Answer: 0.25m

Im not sure but i think

Explanation:0.25/0.25

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3 years ago

Water containing large amounts of Mg2+and Ca2+ions is said to be hard because it is hard to make soap lather in the water. True

mafiozo [28]

Answer:True

Explanation:

Water is said to be hard when it contains calcium ions or magnesium ions dissolved in it. These ions are able to react with soap in such a way that the soap is prevented from forming lather with the water. Hard water occurs when water passes over calcium or magnesium bearing minerals and dissolves some of it. Hardness due to the presence of calcium ions can easily be removed by boiling the water.

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3 years ago

The type of reaction that takes place when one element reacts with a compound to form a new compound and a different element is

Airida [17]

C. single replacement. A single replacement is represented by this formula : AB + C = AC + B

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2 years ago

Read 2 more answers

Ethanol (C2H5OH) is produced from the fermentation of sucrose in the presence of enzymes.

madam [21]

actual yield of ethanol = 305.0g

molar mass of sucrose = 342g

molar mass of ethanol =46g

mass of sucrose = 665g

mole of sucrose = mass / molar mass = 665/342

mole of sucrose =1.9 mole

sucrose : C2H5OH

1 : 4

1.9 : 1.9x4 =7.6 mole of C2H5OH are formed

mass (therotical yield ) of C2H5OH= mole x mass

mass (therotical yield ) of C2H5OH= 7.6 x 46 = 349.6g

percent yields of ethanol = actual /therotical x100

=305/349.6x100 = 87.24 %

6 0

3 years ago

Why baking soda is used to make doughnuts Please answer it soon

inessss [21]

Answer:

There are recipes that are made with both baking powder (for leavening) and baking soda (to facilitate browning by increasing the pH making batters and dough a little more alkaline).

hope this helpssss.

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2 years ago