Ask question

Ask question

All categories

3 years ago

15

A student does not observe a change when holding a test tube in a flame. However, a change is expected. What is the most likely

reason for this?

2 answers:

love history [14]3 years ago

5 0

Heat is energy, and that energy would eventually cause the object to undergo a phase change.

astraxan [27]3 years ago

5 0

D. The reactants were not heated long enough.

You might be interested in

Please please help me! please do what you can do and what you understand

ExtremeBDS [4]

Answer:

I don't understand any thing

Explanation:

u help me

6 0

3 years ago

Which best compares a homogeneous mixture and a heterogeneous mixture?

deff fn [24]

Answer is <u>D</u> - homogeneous mixture has the same throughout a while a heterogeneous mixture is not a uniform throughout. Explanation: I hoped that helped.

7 0

3 years ago

write the ground-state electron configurations of the seventh and eighth elements in the first transition series in Universe fif

Tju [1.3M]

Answer: Check explanation.

Explanation:

Transition metals are metallic elements that can be found in the Groups IVB–VIII, IB, and IIB on the periodic chart.

The question require us to write down the GROUND state electronic configuration of the first fifth transition metal, sixth transition metal, seventh transition metal element and the eighth transition metal.

NOTE: we are Starting from Argon, which has 18 electrons.

The fifth transition metal is Manganese,Mn. Manganese has 25 electrons, that is, 25- 18= 7. Therefore, it needs seven electrons to complete the configuration.

Hence, The ground state electronic configuration = [Ar)] 3d5. 4s2.

The first sixth Transition metal is iron,Fe. Iron has 26 electrons, that is, 26 - 18 = 8. Therefore, it need eight Electrons to complete the ground state electronic configuration.

Hence, the ground state electronic configuration of Fe= [Ar] 3d6. 4s2.

The first seventh transition metal is Cobalt, Co. It has 27 Electrons, therefore, 27- 18 = 9. Therefore, it needs 9 Electrons to complete its ground state electronic configuration.

Ground state electronic configuration of Co= [Ar] 3d7. 4s2.

The first eight Transition metal is Nickel. It has 28 electrons. Therefore, 28-18= 10. So, it needs 10 Electrons to complete its ground state electronic configuration.

Hence, the Ground state electronic configuration of Ni= [Ar] 3d8. 4s2.

5 0

3 years ago

Hi! Can someone help me with this???

nikklg [1K]

Hey there,

I hope this answer solves your doubt.

<u>S</u><u>t</u><u>e</u><u>p</u><u>-</u><u>b</u><u>y</u><u>-</u><u>s</u><u>t</u><u>e</u><u>p</u><u> </u><u>Expla</u><u>n</u><u>a</u><u>t</u><u>i</u><u>o</u><u>n</u><u>:</u><u>-</u>

The question is asking if the bonds between Carbon and Chlorine in CCl4 will be single, double or triple bonds.

<em>(</em><em>The structure of CCl4 </em><em>i</em><em>s attached as picture. Check it</em><em>)</em>

As per image, the structure consists of <u>Singl</u><u>e</u><u> </u><u>b</u><u>o</u><u>n</u><u>d</u><u>s</u><u>.</u> It is <u>4 single bonds</u>.

4 0

2 years ago

Match the following.

Elina [12.6K]

Answer:

hybrid BB

Dominant Bb

recessive alleles bb

phenotype ratio 3:1

6 0

4 years ago

Read 2 more answers