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fomenos
3 years ago
6

How many elements have been discovered so far by scientists ​

Chemistry
1 answer:
Inessa [10]3 years ago
6 0

Answer:

118 elements have been discovered so far

Explanation:

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Write the nuclear symbol for the neutral atom shown. 5 protons, 6 neutrons, 5 electrons. nuclear symbol:
OLga [1]

Answer:

B

Explanation:

the element is boron, therefore B is the symbol

3 0
2 years ago
When an object floats in water, it displaces a volume of water that has a weight equal to the weight of the object. If a ship ha
swat32

The amount of seawater that will be displaced would be 1.3274 x 10^5  ft^3

<h3>Density and volume</h3>

Density = mass/volume.

Since a floating object displaces its own weight, a 4247 tons ship will also displace the same amount of water.

4247 tons of seawater = 3.8528 x 10^9 g

volume of 3.8528 x 10^9 g seawater = mass/density = 3.8528 x 10^9 g/1.025 = 3758829268.29 cubic centimeter.

3758829268.29 cm^3 = 132741.80 ft^3 or 1.3274 x 10^5  ft^3

More on density can be found here: brainly.com/question/15164682

#SPJ1

6 0
3 years ago
Diazomethane has the molecular formula CH2N2. Draw the preferred Lewis structure for diazomethane and assign formal charges to a
Alja [10]

Answer:

See explanation

Explanation:

We define the formal charge on an atom in a molecule as the charge it carries assuming that electrons in all chemical bonds of the molecule were shared equally between atoms irrespective of the electronegativity of each atom.

The formula for calculating the formal charge on an atom in a molecule is;

Formal Charge = [number of valence electrons on neutral atom] – [(number of lone electron pairs) + (½ number of bonding electrons)] ·

The formal charge on the two nitrogen atoms in diazomethane is obtained as follows;

Middle nitrogen atom = 5 – 8/2 – 0 = +1

Last nitrogen atom = 5 – 4/2 – 4 = –1

The Lewis structure of the molecule is shown in the image attached.

8 0
3 years ago
A rectangular block of zinc was found to be 11.014 cm wide, 0.2481 m high, and 523.735 mm deep.
ehidna [41]

From the stoichiometry of the problem, 2.01  × 10^5 g of zinc phosphate is produced.

<h3>What is volume?</h3>

Volume is the product of width, height and depth. The significant figures of the width, height and depth are 5, 4 and 6 respectively.The volume of the box is; 11.014  × 10^-2 m  × 0.2481 m × 523.735 × 10^-3 = 0.01431 m^3 or 14310 cm^3 or 0.5053ft^3.

Density of zinc = 7.140 g / cm3

Volume of zinc = 14310 cm^3

Mass of zinc = 7.140 g / cm3 ×  14310 cm^3 = 102 Kg

Moles of Zinc = mass /molar mass = 102 × 10^3/65 g/mol = 1569 moles

There are 195 g of zinc in  386 g zinc phosphate

102 × 10^3 g of Zn will produce  x g

x = 102 × 10^3 g ×  386 g / 195 g

x = 2.01  × 10^5 g of zinc phosphate

Learn more about stiochiometry: brainly.com/question/9743981

6 0
2 years ago
A fast-moving neutron strikes a U235 nucleus. The nucleus shatters producing Sm155, Zn78, and three neutrons. Describe this chan
Natasha2012 [34]

The balanced nuclear equation for the reaction is

<h3>²³⁵₉₂U + ¹₀n —> ¹⁵⁵₆₂Sm +  ⁷⁸₃₀Zn + 3(¹₀n)</h3>

From the question given above, we were told that:

<u>A fast-moving neutron strikes a ²³⁵U nucleus. The nucleus shatters producing ¹⁵⁵Sm, ⁷⁸Zn, and three neutrons.</u>

The nuclear equation can be written as follow:

Neutron => ¹₀n

Uranium => ²³⁵₉₂U

Samarium => ¹⁵⁵₆₂Sm

Zinc => ⁷⁸₃₀Zn

Uranium + neutron —> Samarium + Zinc + 3 moles of neutron

<h3>²³⁵₉₂U + ¹₀n —> ¹⁵⁵₆₂Sm +  ⁷⁸₃₀Zn + 3(¹₀n)</h3>

 

 The nuclear equation above is balanced.

Learn more: brainly.com/question/9943790

3 0
3 years ago
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