Can I have help with this I have no idea, is this a trick question?

Explanation:

% phosphorus by mass

            = (mass of phosphorus ÷ mass of phosphoric acid) × 100%

            = (30.974 g/mol ÷ 97.994 g/mol) × 100%

Answer:

about 5 years i think

Explanation:

I've tried all the methods i know

it's about 5 years

hope it helps

The age of the artifact is equal to 2.5 × 10³ years when the half-life of carbon- 14 is 5.73 × 10³ years.

The half-life of a radioactive element is defined as the time that is required to decrease the original quantity of a radioactive isotope to half after decay.

The half-life of a radioactive isotope is the feature of the element and does not depend upon the actual amount of the radioactive isotope.

Given, the ratio of the initial and left amount of  ¹⁴C is :

N = 0.745 N₀

The half-life period of the ¹⁴C isotope = 5.73 × 10³ years

The rate constant of the decay of radioisotope can be calculated from the below-mentioned formula:

[tex]\displaystyle k=\frac{0.693}{t_{1/2}}[/tex]

[tex]\displaystyle k=\frac{0.693}{5.73 \times 10^3}[/tex]

k = 0.123 × 10⁻³ yr⁻¹

The age of the artifact can be calculated as:
[tex]\displaystyle t =\frac{2.303}{k} log\frac{N_0}{N}[/tex]

[tex]\displaystyle t =\frac{2.303}{0.123\times 10^{-3}} log\frac{N_0}{0.735 N_0}[/tex]

t = 2.5 × 10³ years

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Answer:

With an element from group 16

Explanation:

Because the elements from group 2 have 2 valence electrons, and the elements from group 16 need to get more 2 electrons to get stable

Answer:

It has a high electrical conductivity, caused by dissociation through protonating itself, a process known as autoprotolysis. The comparable equilibrium constant for water, Kw is 10−14, a factor of 1010 (10 billion) smaller.

Answer:

As the temperature increases, the gas particles absorb more heat energy. They speed up and move farther away from one another. So the increase in temperature causes an increase in volume. (Boyles Law)

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Air pressure is greatest near the surface of the Earth in the Troposphere .

Answer:

D. 1, 2, and 3

Explanation:

Answer:

Electrons

Explanation:

Cathode rays carry electronic currents through the tube. Electrons were first discovered as the constituents of cathode rays. J.J. Thomson used the cathode ray tube to determine that atoms had small negatively charged particles inside of them, which he called “electrons.”

The rays produced in a cathode tube are electrons which are present in the shells surrounding the nucleus of an atom.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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answer: 334 J

explain: A total of 334 J of energy are required to melt 1 g of ice at 0°C, which is called the latent heat of melting.

Answer: It will give up electrons, forming a positive ion.

During bonding, strontium atom will give up electrons, forming a positive ion.

STRONTIUM:

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Answer:

41.9866

Explanation:

18.02x2.33

Hope this helps!

(please make me brainleist I need to level up)

Answer:

1st one is the answer water cannot be purified by nature pls add me in brainliest

The type of fron created is a "warm" front.

Actual answer: 6

Well I also need help with this, this should help the both of us:

A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.

Explanation:

The first two period elements can form maximum 4 covalent bonds. However, third or higher period elements can make higher number of bonds for example; SF6.

Answer:

Fertilization

Explanation:

Fertilization occurs when the nucleus of both a sperm and an egg fuse to form a diploid cell, known as zygote. The successful fusion of gametes forms a new organism.

Answer:

c. The heat from the hot cup warms my hands

Answer:

A - X Only

Explanation:

Answer: The answer is 457.9

Explanation: Realistically all you have to do is add both of the temperatures and then you can figure out the original heat. Since the heat drops 426.7 degrees and it comes to 31.2 degrees its 426.7 + 31.2 = 457.9.

Answer:

carbon 12 6 6

Explanation:

Answer:

by principal quantum number (n) and azimuthal quantum number (l)

Explanation:

I used the web to answer so I'm not sure if this is right

Answer:

Explanation:Compounds between Nonmetals and Nonmetals

Compounds that consist of a nonmetal bonded to a nonmetal are commonly known as Molecular Compounds, where the element with the positive oxidation state is written first. In many cases, nonmetals form more than one binary compound, so prefixes are used to distinguish them.

# of Atoms 1 2 3 4 5 6 7 8 9 10

Prefixes Mono- Di- Tri- Tetra- Penta- Hexa- Hepta- Octa- Nona- Deca-

the compounds are covalent, not ionic

Answer:

false

Explanation:

Answer:

glucose and amino acids

Explanation:

Answer:

0

Explanation:

Answer:

Newtons first law

Explanation:

focre=mass x acceleration