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Dennis_Churaev [7]
3 years ago
8

Identify the element below

Chemistry
1 answer:
marysya [2.9K]3 years ago
4 0

Answer:

Beryllium

Explanation:

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Assuming constant pressure, rank these reactions from most energy released by the system to most energy absorbed by the system,
defon

Answer:

C: The surroundings heat up and the system decreases in volume.

D: The surroundings heat up and the system does not change volume.

B: The surroundings heat up and the system expands in volume.

A: The surroundings get cold and the system decreases in volume.

Explanation:

The most exothermic reactions are those that release heat, that is to say, they give up the heat as it cools and the surroundings heat up.

As for endothermics, that is, those that absorb or capture the heat of the medium, they are variables that cool the environment that surrounds them and increase their internal temperature

5 0
3 years ago
Which properties can be measured without changing the chemical composition of the matter? _______ properties can be measured wit
evablogger [386]

Answer:

\boxed {\sf Physical}

Explanation:

There are two main kinds of properties: chemical and physical.

Chemical properties, like the name suggests, have to be observed by changing the chemical composition.

That leaves <u>physical properties.</u> They can be measured without any chemical composition changes.

Some examples include: color, odor, mass, density, and volume. All can be measured with just the senses or measuring tools and no composition alterations are needed.

3 0
3 years ago
Read 2 more answers
A0C3H7OH + <br> a1O2 → <br> a2CO2 + <br> a3H2O
Kobotan [32]
2C₃H₇OH + 9O₂ = 6CO₂ + 8H₂O

a₀=2
a₁=9
a₂=6
a₃=8
5 0
3 years ago
Why did the french became allies with the american?
Rus_ich [418]

Answer:

It’s to gain territory

Because they wanted more territory than what they already had.

8 0
3 years ago
Why would an unstable radioactive isotope (nuclide) emit a beta particle (high energy electron)?
sasho [114]

Answer:

A)It has too many neutrons

Explanation:

Electrons are emitted from the nucleus when a neutron is converted to a proton, an electron and a neutrino. This process is popularly known as beta emission. It reduces the neutron-proton ratio of a nuclide. The neutrino is a particle of zero mass and zero charge that carries off the excess energy and balances spins.

The loss of an electron from the nucleus occurs when there are too many neutrons in the nucleus. The process of beta emission usually reduces the number of neutrons in an atom thereby decreasing the neutron-proton ratio.

4 0
3 years ago
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