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GREYUIT [131]
2 years ago
13

A white powder is added to a solution. The images show observations made before the powder is added, just after the powder has b

een added, and a little while later. (The liquid in the small beaker is phenol red solution.) What evidence shows that a chemical change has taken place?
Chemistry
2 answers:
7nadin3 [17]2 years ago
6 0

There was a change in its color from white to red which can only be changed by a chemical reaction

makvit [3.9K]2 years ago
5 0

D.All of above. Hope it helps!!!

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Which traits does the common garter snake have that might be adaptive for the environment where it lives?
Licemer1 [7]

Answer:

As the garter snake can be found almost in any kind of habitat, what makes them be able to survive in any environment include:

1. They hibernate to increase their chances of survival in unfavorable weather conditions.

2. They can blend with the background of any environment especially grass to escape being eaten.

3. They produce an odor that is usually unpleasant especially when about to be attacked.

Explanation:

The garter snakes are distinguished by the three stripes running the length of their body and can often be found in forests, places that are even close to water bodies, and almost any place, even in holes.

 

           

4 0
2 years ago
To convert m-ethylaniline to m-ethylfluorobenzene, it should be treated with nitrous acid followed by _____________.
bezimeni [28]

Answer:

NaBF_4

Explanation:

In this reaction, we must exchange the amino group (NH_2) for a fluorine atom (F). Also, the first step in this reaction is the addition of nitrous acid.

We must remember that the amino group in the presence of nitrous acid produces a diazonium salt. The N_2 group is a very good leaving group and many benzene derivatives can be produced from this intermediate (see figure 1).

If what we want is to bond a fluorine atom we must use NaBF_4 to be able to produce m-ethylfluorobenzene (see figure 2).

I hope it helps!

6 0
2 years ago
How many grams of water can be cooled from 41 ∘c to 19 ∘c by the evaporation of 62 g of water? (the heat of vaporization of wate
Vsevolod [243]
62 g of water are vaporized and the energy required is 2.4 kJ/g

So 62g x 2.4 kJ/g = 148.8 kJ or 148,800 Joules 

Q = mCΔT
Q is energy in joules, m is mass of water, C is the specific heat, delta T is change in temp

148,800 = m(4.18)(41 - 19) = 1618g or 1.6 kg of water

8 0
2 years ago
When a radioactive magnesium (Mg) atom decays by emitting a positron, what is the identity of the resulting atom? A. Aluminum (A
iragen [17]

The answer is: D. Sodium (Na).

Beta decay is radioactive decay in which a beta ray and a neutrino are emitted from an atomic nucleus.

There are two types of beta decay: beta minus and beta plus.

In beta plus decay (atomic number Z is decreased by one), a proton is converted to a neutron and positron and an electron neutrino, so mass number does not change.

In this example, magnesium (atomic number 12) is converted to dosium (atomic number 11).

5 0
2 years ago
The chemical agent or hazardous material that interferes with the body's ability to transfer oxygen to the cells is:
zheka24 [161]
Phosgene its a my friend used in the war
7 0
2 years ago
Read 2 more answers
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