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Nataly_w [17]
3 years ago
7

Determine the number of significant figures in each of the following measurements

Chemistry
2 answers:
Artist 52 [7]3 years ago
8 0
 Determine the number of significant figures in each of the following measurementsA). 11 soccer player 
B). 0.070020 meter 
C). 10,800 meters 
D). 0.010 square meter 
E). 5.00 cubic meters 
F). 507 
Alexus [3.1K]3 years ago
7 0

Explanation:

Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.

Rules for significant figures:

  1. Digits from 1 to 9 are always significant and have infinite number of significant figures.
  2. All non-zero numbers are always significant. For example: 684, 6.24 and 85.4 all have three significant figures.
  3. All zero’s between integers are always significant. For example: 5605, 5.905 and 50.15 all have four significant figures.
  4. All zero’s preceding the first integers are never significant. For example: 0.0098 has two significant figures.
  5. All zero’s after the decimal point are always significant. For example: 4.400, 47.00 and 440.0 all have four significant figures.
  6. All zeroes used solely for spacing the decimal point are not significant. For example : 3000 has one significant figure.

A). 11 soccer player  : 2 significant figures

B). 0.070020 meter  : 5 significant figures

C). 10,800 meters: 5 significant figures

D). 0.010 square meter: 2 significant figures

E). 5.00 cubic meters: 3 significant figures

F). 507 thumbtacks: 3 significant figures

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Intermolecular forces between particles are​
WITCHER [35]

Explanation:

Intermolecular forces hold multiple molecules together and determine many of a substance's properties. All of the attractive forces between neutral atoms and molecules are known as van der Waals forces, although they are usually referred to more informally as intermolecular attraction.

Intermolecular forces are the forces of attraction or repulsion which act between neighboring particles (atoms, molecules, or ions ). These forces are weak compared to the intramolecular forces, such as the covalent or ionic bonds between atoms in a molecule.

6 0
2 years ago
A 4.000 g sample of iron was heated from 0.0°C to 21.0°C. If it has a specific heat of 0.440 kJ/kg °C, how many kilojoules of he
Mashutka [201]
M = 4 g = 4/1000 kg = 0.004 kg, θ₂ = 21.0°C, θ₁ = 0°C , c = 0.44kJ/kg°C,

Q = mc(θ₂ - θ₁)

Q = 0.004*0.440*(21 - 0)

Q  =  0.03696 kJ 

0.03696 kJ<span> of heat is absorbed.</span>
6 0
3 years ago
The question is below
nevsk [136]
The reducing agent is donating electrons and therefore becoming oxidised itself. In this scenario elemental zinc (Zn) is in a reduced state and is oxidised to become Zn2+, in doing so it donates electrons to Fe2+, thereby reducing it to elemental iron (Fe).

The elemental Zinc in solid state is therefore the reducing agent as it reduces Fe2+ to Fe(s).
7 0
3 years ago
True or false in a chemical reaction some of the atoms will be changed into different type of atoms​
Anika [276]

Answer:

It's false

Explanation:

7 0
2 years ago
The density of water is 1 gm/ml. An object has a mass of 58 grams. What volume must it have in order to float in water?
Keith_Richards [23]

Answer:

58mL

Explanation:

Given parameters:

Density of water  = 1g/mL

Mass of object  = 58g

Unknown:

The volume the object must have to be able to float in water = ?

Solution:

To solve this problem, we know that the object must have density value equal to that of water or less than that of water to be able to float.

We then set its density to that of water;  

   Density  = \frac{mass}{volume}  

      Volume  = \frac{mass}{density}  

So;

      Volume  = \frac{58}{1}   = 58mL

7 0
2 years ago
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