3 years ago

Why are there so many substances?

1 answer:

3 0

Answer:

first conclusion was that the whole world is made up of only 4 elements but as the time passed more elements were discovered... if the world would not contain more elements... you wouldn't be alive.

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Which mineral is hard enough to scratch calcite? *

antiseptic1488 [7]

Answer:

Should be number 4, quartz.

Explanation:

Quartz is rougher than calcite, therefore it's able to scratch it.

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3 years ago

A field produced by a magnetic object that exerts a force on other magnetic materials or moving electrical charges is called ala

Harman [31]

Answer: magnetic field

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3 years ago

12 + NaF --> Nal + F2 What is the coefficient of Nal when this equation is<br> balanced? *

e-lub [12.9K]

Answer:

Explanation:

NaL

Difluorine - F2

Molar Mass Bond Polarity F₂ Fluorine Gas Fluorine

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Sodium Fluoride - NaF

Molar Mass Bond Polarity Oxidation State Floridine Sodium Monofluoride Naf

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3 years ago

Transport of material into a cell against a concentration gradient, from low to high, requires

Afina-wow [57]

Answer:

B. It requires energy

Explanation:

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4 years ago

Write the isotope notation for an element with 53 protons and 20 neutron?

iris [78.8K]

The isotope notation : ⁷³₅₃X

<h3>Further explanation</h3>

Given

53 protons and 20 neutron

Required

The isotope notation

Solution

Isotopes are elements that have the same atomic number with a different mass number

The following element notation,

$\large {{{A} \atop {Z}} \right X}$

X = symbol of element

A = mass number

= number of protons + number of neutrons

Z = atomic number

= number of protons = number of electrons, on neutral elements

So the mass number of element = 53 + 20 = 73

Atomic number = 53

The symbol :

$\large {{{73} \atop {53}} \right X}$

5 0

3 years ago