3 years ago

What is cement and who invented it?

1 answer:

5 0

Answer:

Cement is a combination of calcium, silicone, aluminum, iron and lots of other ingredients to make side walks, home made crafts, etc. The person who invented concrete is Joseph Aspdin.

Explanation:

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K + Li2O what is the product

shutvik [7]

Answer:

2K + Li2O → 2Li + K2O

3 0

2 years ago

This is the chemical formula for methyl acetate: CH32CO2. Calculate the mass percent of hydrogen in methyl acetate. Round your a

WITCHER [35]

<u>Answer:</u> The mass percent of hydrogen in methyl acetate is 8 %

<u>Explanation:</u>

The given chemical formula of methyl acetate is $CH_3COOCH_3$

To calculate the mass percentage of hydrogen in methyl acetate, we use the equation:

$\text{Mass percent of hydrogen}=\frac{\text{Mass of hydrogen}}{\text{Mass of methyl acetate}}\times 100$

Mass of hydrogen = (6 × 1) = 6 g

Mass of methyl acetate = [(3 × 12) + (6 × 1) + (2 × 16)] = 74 g

Putting values in above equation, we get:

$\text{Mass percent of hydrogen}=\frac{6g}{74g}\times 100=8.10\%=8\%$

Hence, the mass percent of hydrogen in methyl acetate is 8 %

8 0

3 years ago

HELP . which kind of tides causes the highest and lowest tides ?

katen-ka-za [31]

Answer: spring tides
When earth, moon, and sun line up cause high and low tides :)

6 0

2 years ago

Do you always have to begin with two compounds in a neutralization reaction

Paladinen [302]

Answer:

Yes.

Explanation:

Only an acidic compound and then a basic compound react(neutralization reaction) to give a salt.

Acid+Base=Salt+Water.

Hope this helps❤❤❤

3 0

3 years ago

3. How many moles of HCl are present in 3.70 L of a 2.33 M HCl solution?

Lubov Fominskaja [6]

Answer:

8.6 mol

Explanation:

number of moles = molar concentration x volume in litre

number of moles = 2.33 M x 3.70 L = 8.6 mol

4 0

3 years ago