Help with chemistry please

Which chemical reaction involves the most oxygen atoms?

Answer:

D) 16 km/hr​

Explanation:

When the speed increases, the kinetic energy increases, but the mass never changes.

Answer:

d

Explanation:

Answer:

1%  A

Explanation:

Answer:

halogens

hope its right

Answer:

there combine with an acid called sodium chloride or magnesium sulphate

Answer:

[tex]75\ \text{g}[/tex]

Explanation:

t = Time = 180 years

[tex]t_{1/2}[/tex] = Half-life of titanium = 60 years

[tex]N_0[/tex] = Initial amount of titanium = 600 g

We have the relation

[tex]N=N_0e^{-\lambda t}\\\Rightarrow N=N_0e^{-\dfrac{\ln 2}{t_{1/2}}t}\\\Rightarrow N=600e^{-\dfrac{\ln 2}{60}\times 180}\\\Rightarrow N=75\ \text{g}[/tex]

The mass that is left after 180 years is [tex]75\ \text{g}[/tex].

Explanation:

A because A galvanic cell consists of two half-cells, such that the electrode of one half-cell is composed of metal A, and the electrode of the other half-cell is composed of metal B; the redox reactions for the two separate half-cells are thus: An+ + ne− ⇌ A.

Answer:

A

Explanation:

Answer:

116 years

Explanation:

To solve this, we will use the half life equation;

A(t) = A_o(½)^(t/t_½)

Where;

A(t) is the amount of strontium left after t years;

A_o is the initial quantity of strontium that will undergo decay;

t_½ is the half-life of strontium

t is the time it will take to decay

We are given;

A(t) = 7.5 g

A_o = 120 g

From online values, half life of strontium-90 is 29 years. Thus, t_½ = 29

Thus;

7.5 = 120 × ½^(t/29)

Divide both sides by 120 to get;

7.5/120 = ½^(t/29)

0.0625 = ½^(t/29)

In 0.0625 = (t/29) In ½

-2.772589 = (t/29) × (-0.693147)

(t/29) = -2.772589/(-0.693147)

t/29 = 4

t = 29 × 4

t = 116 years

Answer:

..sure....

Explanation:

Answer:

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Answer:

A

Explanation:

beacause in both the electronegativity values and number of first she'll electrons

In group 14 from top to bottom there are changes in both the electronegativity values and atomic radii changes.

Groups in the periodic table are the columns in which elements are present which all are having same number of valence electrons.

On moving top to bottom in the 14th group of the periodic table:

Hence electronegativity values and atomic radii changes.

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Answer: A decomposition reaction occurs when one reactant breaks down into two or more products.

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Answer:

A student is drinking a cup of hot chocolate as they sit by a campfire on a chilly evening. They know that the cup of hot chocolate transfers thermal energy to the surrounding air. The heated air over their cup of hot chocolate expands and rises and is replaced by cooler, denser air.

This method of energy transfer is

Explanation:

Answer:

radiation

Explanation:

radiation is when an existing heat source spreads heat to its surroundings

Between steps 2 and 3, the chemical energy in the coal is converted to heat energy. So, the correct option is D.

The bonds of chemical compounds which contain a type of potential energy known as chemical energy. It is the energy that is given out or absorbed during a nuclear rearrangement or chemical reaction.

Chemical energy is a form of potential energy, which can be released and converted into different types of energy such as heat, light or electrical energy. Some examples of chemical energy include power stored in batteries, as well as fuels such as coal, oil and gas, and food. The chemical energy in the coal is converted to thermal energy in the given above example between steps 2 and 3.

Therefore, the correct option is D.

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The diagram of the mixture is the third diagram

Explanation:

So, from this, we can conclude that from the given particle diagrams, the diagram of the mixture is the third diagram as it has one compound molecule and two atoms of a different element.

Learn more about element, compound, and mixture here:

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Answer:

Alkali metals are elements found in group 1 of the Periodic Table. Alkali metals are soft, malleable, ductile, and are good conductors of heat and electricity. They have low melting and boiling points compared to most other metals.

Answer:

[tex]2~CH_3OH+3~O_2\rightarrow2~CO_2+4~H_2O\\[/tex]

The coefficients would be 2, 3, 2, and 4.

Explanation:

If we want to check this we would multiply the coefficient by each element. What we want is to have the same number of atoms on each side.

Reactant side:

Product side:

And that's it!

Answer:

The common way electrons are found in shells or orbitals that surround the nucleus of an atom.I hope it helped

Explanation:

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Answer:

(a) ==> O²-

(b) ==> Al³+

(c) ==> Ti²+

(d) ==> I-

Answer:

N2+ 3H2－> 2NH3

2Fe + 6HCl －> 3H2 + 2FeCl3

Answer 12.2g is the answer

Answer: how dense the object is and if it has air in it.

Explanation:

Answer:

Density determines the situation.

The denser the body than water, it sinks in water

The less dense the body than water, it floats on water.

Answer: has a -1 charge

is an electron

is emitted from the nucleus

Explanation:

The beta particle is basically an electron with -1 charge and no mass.

Beta particles are  fast-moving electron emitted by radioactive decay of substances. Beta particles have a charge of - 1, and a mass of about [tex]\frac{1}{2000}[/tex] th of a proton. This means that beta particles are the same as an electron.

A beta particle, also called beta ray or beta radiation [tex](\beta)[/tex], is a high-energy, high-speed electron or positron emitted by the radioactive decay of an atomic nucleus during the process of beta decay.

A beta particle is emitted from an atomic nucleus, transforming the original nuclide to an isobar of that nuclide.

Answer:

There is nothing with data to help us complete this chart

THIS IS BAD. THIS IS REALLY BAD

Answer:

d. oxygen is a pure substance and rocks are mixtures

Answer:

A rock is a mixture and oxygen is a pure substance

Explanation:

Oxygen is just O O O O O O and rocks have many things in it like minerals, fossils and rock stuff. I'm not a geologist

Answer:

105.8 m/s

Explanation:

V = f * w

Where V is the velocity (m/s)

f is the frequency (hz)

w is the wavelength (m)

Answer:

Transitional Energy ......

Explanation:

Hope this helps..................................

Answer:

heat energy!!!

Explanation:

Answer:

there are three fundamental particles of atom

which are :

Particle Symbol

electron =》e-

proton =》p+

neutron =》n°

Answer:

Elements and compounds are two types of pure substances.

Explanation: