All categories

4 years ago

The measurement 0.41006 gram, rounded to three significant figures, is expressed as

Chemistry

1 answer:

atroni [7]4 years ago

3 0

Answer:

option B = 0.410 g

Explanation:

The given measurement have five significant figures 41006. this measurement can be rounded to three significant figures i.e, 0.410 g.

All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.

Leading zeros are not consider as a significant figures. e.g. 0.03 in this number only one significant figure present which is 3.

Zero between the non zero digits are consider significant like 104 consist of three significant figures.

The zeros at the right side e.g 2400 are also significant. There are four significant figures are present.

You might be interested in

Temka [501]

Salt dissolving in water is usually considered to be a physical change so I’m pretty sure it’s that sorry if I’m wrong

6 0

3 years ago

Dolomite is a carbonate of magnesium and calcium. Analysis shows that 7.81 g of dolomite contains 1.70 grams of Ca. Fluorite is

andrew11 [14]

Answer:

The richer source of calcium is fluorite.

Explanation:

Percentage of element in compound :

$=\frac{\text{mass of element}}{\text{Mass of compound}}\times 100$

1. Dolomite is a carbonate of magnesium and calcium:

Given mass of dolomite = 7.81 g

Mass of calcium present in given mass of dolomite = 1.70 g

Percentage of calcium in Dolomite:

$=\frac{1.70 g}{7.81 g}\times 100=21.77\%$

2. Fluorite is a mineral of calcium and fluorine:

Given mass of fluorite = 2.76 g

Mass of fluorine present in given mass of fluorite = 1.34 g

Percentage of fluorine in fluorite :

$=\frac{1.34 g}{2.76 g}\times 100=48.55\%$

Percentage of calcium in fluorite = 100% - 48.55 % = 51.45%

Percentage of calcium in fluorite > Percentage of calcium in Dolomite

51.455 > 21.77%

So, the richer source of calcium is fluorite.

7 0

3 years ago

A student states that this structural formula represents a hydrocarbon.

DedPeter [7]

Answer: <span>Yes, a hydrocarbon is any compound that contains hydrogen and oxygen.

Justification:

First, I will try to rewrite the given structural formula since it is misrepresented.

This should be the right structural formula:

       H    H
       |      |
H - C - C - OH
       |      |
      H     H

And, yes the definition of hydrocarbon is that it is most simple organic compound constitured only by atoms of carbon (C) and hydrogen (H).

By the way, that hydrocarbon is also represented as CH3 - CH2 OH, it is an alcohol (since it has the functional group OH) and its name is ethanol.
</span>

4 0

3 years ago

Read 2 more answers

What is the Molar Mass of MgO?

ivanzaharov [21]

Answer:

The answer should be 40.3044 g/mol

3 0

3 years ago

L 4.1.4 Quiz: Using the Mole

Orlov [11]

Answer:

B. A chemical formula that shows the relative number of each type of

atom in a molecule, using the smallest possible ratio

Explanation:

The empirical formula of a compound shows the relative number of each type of atom in a molecule and it uses the smallest possible ratio.

It expresses the composition of the compound in the simplest whole number ratio of the atoms of the different elements that makes up the compound.
To determine empirical formula of a compound , two pieces of information are needed;
A. mass of each element in the compound
B. Relative atomic mass of the constituent elements.

6 0

3 years ago