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4 years ago

Which of the following is an area targeted by countries to reduce environmental impact?

Chemistry

2 answers:

Ainat [17]4 years ago

8 0

the answer is D on e2020

Doss [256]4 years ago

5 0

Answer:greenhouse gas emissions

Explanation:

Each country targets the minimization of green house gases. Green house gases are those gases that are known to contribute towards global warming or greenhouse effect such as CO2, N2O,and water vapour. This is the rationale behind the move by many countries towards the substitution of fossil fuels by cleaner fuels. Fossil fuels produce carbon IV oxide which is known to lead to global warming. Greenhouse gasses impact the environment negatively by raising the temperature of the earth.

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Which type of relationship exists between Alaskan brown bears and salmon? A. predation B. mutualism C. competition D. commensali

aksik [14]

Answer:

A. predation.

Explanation:

Predation is a type of ecological interaction in which one organism which is known as predator feeds upon another organism thereby killing it. The organism which is killed by predator is known as prey. In such interaction one organism is benefited while another one is harmed.

Brown bears of Alaska feed upon salmon. In order to so they have developed many ways which include waiting at the bottom of falls from where salmons pass by or standing at the bottom of the falls.

3 0

4 years ago

Uranium-238 undergoes radioactive decay according to the incomplete below. 238

Darina [25.2K]

The decay product represented by X : Thorium (Th) : ²³⁴₉₀Th

<h3>Further explanation</h3>

Given

Decay reaction

²³⁸₉₂U ⇒ ⁴₂He + X

Required

The decay product

Solution

Radioactivity is the process of unstable isotopes to stable isotopes by decay, by emitting certain particles,

alpha α particles ₂He⁴
beta β ₋₁e⁰ particles
gamma particles ₀γ⁰
positron particles ₁e⁰
neutron ₀n¹

In a decay reaction, <em>the sum of the mass number and atomic number of the elements in the reactants and products must be the same</em>

So the mass number of the element X = 238 - 4 = 234

Atomic number of the element X = 92 - 2 = 90

If we look at the periodic system, then the element with atomic number 90 is Thorium (Th)

8 0

3 years ago

What type of hybridization (according to valence bond theory) does fe exhibit in the complex ion, [fe(h2o)4(br)2]+? what type of

Jlenok [28]

We have 6 pairs of electrons here and the shape is Octahedral so the correct type of hybridization is: d²sp³
Check the provided picture

7 0

3 years ago

Which compound contains both covalent and ionic bonds kcl nh4cl mgcl2 ccl4

Vedmedyk [2.9K]

The answer is NH4Cl!
Ionic bonding=cation + anion
- the cation ammonium (NH4) has a single electron in its valence shell, and Chlorine needs a single electron to fill its valence shell, and they stick together.
Covalent bond= involves the sharing of electron pairs between atoms
- present in Ammonium ion between Nitrogen and Hydrogen atoms

3 0

4 years ago

Read 2 more answers

What type of reaction is the decay of carbon-14

Nuetrik [128]

Radioactive decay and detection.

5 0

3 years ago