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Tanzania [10]
3 years ago
13

How many protons do the following have? Calcium Gold Copper Iron

Chemistry
1 answer:
Otrada [13]3 years ago
4 0

Answer:

Calcium = 20 protons

Gold = 79 protons

Copper = 29 protons

Iron = 26 protons

Explanation:

Atomic Number = #protons and neutrons

Calcium (Ca)

Atomic Number: 20

Protons: 20

Gold (Au)

Atomic Number: 79

Protons: 79

Copper (Cu)

Atomic Number: 29

Protons: 29

Iron (Fe)

Atomic Number: 26

Protons: 26

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Calculate the hydroxide ion concentration [OH-] for a solution with a pH of 6.10
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There are different formula you need to keep in mind when solving for [OH-]

Given that pH = 6.10

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<h2><u>Answer: [OH-] = 1.3 x 10^-8</u></h2>
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3 years ago
A student is given the question: "what is the mass of a gold bar that is 7.379 × 10–4 m3 in volume? the density of gold is 19.3
IRINA_888 [86]

<em>The mass of a gold bar  = 1.424 x 10⁴ gram</em>

<em></em>

<h3><em>Further Explanation</em></h3>

Density is a quantity derived from the mass and volume

density is the ratio of mass per unit volume

With the same mass, the volume of objects that have a high density will be smaller than type

The unit of density can be expressed in g / cm3 or kg / m3

Density formula:

\large{\boxed{{\bold{\rho~=~\frac{m}{V}}}}

ρ = density

m = mass

v = volume

A common example is the water density of 1 gr / cm3

The mass itself is often equated with weight, even though it is different. Mass is the amount of matter in the matter while weight is related to the gravitational force

<em>Known variable</em>

volume gold bar 7.379 × 10⁻⁴ m³

a density of 19.3 g/cm³

<em>Asked</em>

the mass of a gold bar

<em>Answer</em>

volume is known to be 7.379 × 10⁻⁴ m³, then we change it first to units of cm³ adjusting to units of density

7.379 × 10⁻⁴ m³ = 7.379 × 10² cm³

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mass = volume x density

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mass = 1.424 x 10⁴ gram

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