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4 years ago

A chemist mixes sodium with water and witnesses a violent reaction between the metal and water. this is best classified as

1 answer:

8 0

A law is statement about an observed concept. A theory involves the explanation of scientific concepts or principles. A hypothesis is the predicted explanation about some concepts that has to be tested in order to prove it to be right. An observation is the observing the results of a scientific experiment carried out to test an hypothesis.

Here the given statement 'A chemist mixes sodium with water and witnesses a violent reaction between the metal and water,' can be classified as an observation as it explains what the chemists observes as a result of his chemical experiment or test..

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Answer:

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3 years ago

Determine the empirical formula of a compound containing 47.37 grams of carbon, 10.59 grams of hydrogen, and 42.04 grams of oxyg

inysia [295]

Answer:

Mass of C = 47.37g

Mass of H = 10.59g

Mass of O = 42.04g

The total mass of these elements is 100g, taking a proportion of their molar masses.

C = 47.37/12= 3.95

H = 10.59/1 = 10.59

O = 42.04/16= 2.63.

Dividing through with the smallest proportion which is 2.63

C=3.95/2.63 = 1.5

H =10.59/2.63 =4

O = 2.63/2.63= 1

Multiplying through by 2 to get a whole number.

C = 1.5x2 = 3

H= 4x2 = 8

O = 1x2= 2

The empirical formula is C3H6O2

(Empirical formula)n= molecular mass

(C3H8O2)n =228.276

(12x3 +8+16x2)n= 228.276

76n = 228.276

n = 228.276/76

n = 3

Molecular formula = Empirical formula

=(C3H8O2)3 = C9H24O6

The molecular formula is C9H24O6

4 0

3 years ago

What is the total ionic equation for the following reaction? HCN + LiOH

Advocard [28]

Answer:it’s c

Explanation:just got it on edge

3 0

3 years ago

Read 2 more answers

You are driving down the road at 35 mph. what is your speed in m/s?

Lady_Fox [76]

Answer:

15.64m/s

Explanation:

This is a unit of speed which is the rate of change of distance with time

I am driving at 35mph: and I want to express as m/s

mph means miles per hour

This suggests that I have to convert miles to m and hrs to secs:

for distance 1.609km = 1mi

1000m = 1km

for time:

1hr = 60minutes

1min = 60seconds

Using dimensional analysis:

$\frac{35miles}{1hour}$ x $\frac{1.609km}{1miles}$ x $\frac{1000m}{1km}$ x $\frac{1hour}{60min}$ x $\frac{1min}{60seconds}$

= 15.64m/s

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3 years ago

Find if the example is correct or not and explain using CER please. Will give 5/5

ELEN [110]

The Lewis structure the student drew is incorrect. The total number of electrons in bonds and lone pairs is equal to the total number of valence electrons available, then a valid Lewis structure is produced.

The correct structure is the following:

The structure that was drawn by the student was incorrect because the total number of electrons around Oxygen were incorrect, there were 6 instead of 8, which was against the octet rule. The correct structure should have 8 electrons around each atom.

5 0

1 year ago