All categories

2 years ago

How many significant figures are in this number? 43.55

Chemistry

1 answer:

leva [86]2 years ago

7 0

Answer:

4 significant figures

Explanation:

Significant figures are the units/digits within a number that make the number more accurate and precise.

All digits (except for 0) are always significant. Therefore, all the digits in 43.55 are significant. Since there are 4 digits in the given number, there are 4 significant figures.

You might be interested in

If an atom has 26 electrons, what is the least number of energy levels it has?

kvasek [131]

4 ? each one holds 8

6 0

3 years ago

B. Why is this number called a "mass” number?

deff fn [24]

<u>Answer:</u>

The mass of the atom depends on the sub atomic particles present in the nucleus of an atom.

That is, the protons and the neutrons.

Electrons are present around the nucleus and the mass is negligible since its mass is very very less.

<em>mass of a proton = $1.673\times10^{-27} kg$ </em>

<em>mass of a neutron = $1.675 \times 10^{-27} kg$ </em>

<em>mass of an electron = $9.109 \times 10^{-31} kg$ </em>

Mass number represents the mass of one particular isotope and it is a whole number for example, $_6 C^{13}$

Mass number is 13 and atomic number is 6 for the carbon isotope C-13.

Atomic mass is different from mass number and it is a fraction since it is the average atomic mass of all the isotopes of an atom.

Atomic mass of C is 12.011 amu which we see in the periodic table is the average atomic mass of isotopes C-12, C-13 and C-14.

7 0

4 years ago

What do the rows of the periodic table periodic table indicate

Tatiana [17]

Answer:

The rows on the periodic table are called periods. All the elements in a period have valence electrons in the same shell. The number of valence electrons increases from left to right in the period. When the shell is full, a new row is started and the process repeats.

<h2>I hope it helps plz let me know if it is right or wrong.</h2>

6 0

3 years ago

Help me pleaseeeeeee

Paha777 [63]

The third one because temperature is being used, so a meter stick wouldn’t make sense. You aren’t measuring the length of anything physically. A stopwatch measures time, which is what they are showing in the chart, so the third one is the only one that makes sense.

7 0

3 years ago

Help pleaseeeeeeeeeeeeeeeeeee

Nataly [62]

Answer:

1) Constructive Interference

2) Hits a surface and bounces back

3) Antinodes

7 0

3 years ago

Read 2 more answers