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Studentka2010 [4]
3 years ago
5

Which coal mine does this discribe​

Chemistry
2 answers:
lana66690 [7]3 years ago
6 0

Answer:

He's right.

Explanation:

There are no answers or pictures.

Mila [183]3 years ago
3 0

I cant answer that if I cant see it

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Plssss help meeeeeeee
Montano1993 [528]

All you need to do is to look at both sides of the equation and see who has the same element, state, coefficient, and charge and those will be your spectator ions.

In this question, the spectator ions would be Na^{+} and Cl^{-}.

6 0
2 years ago
Consider the following first-order reaction: A → B. The concentration of A at the start of the reaction is 4.17 M and after 4.84
valina [46]

Answer : The value of rate constant is, 0.0327s^{-1}

Explanation :

First we have to calculate the rate constant, we use the formula :

Expression for rate law for first order kinetics is given by:

k=\frac{2.303}{t}\log\frac{a}{a-x}

where,

k = rate constant  = ?

t = time passed by the sample  = 4.84 s

a = initial concentration = 4.17 M

a - x = concentration after time 4.84 s = 3.56 M

Now put all the given values in above equation, we get

k=\frac{2.303}{4.84}\log\frac{4.17}{3.56}

k=0.0327s^{-1}

Therefore, the value of rate constant is, 0.0327s^{-1}

4 0
3 years ago
Which substance is an Arrhenius acid?<br>a. H2<br>b.HCI<br>c. KCI<br>d, NH,3​
GenaCL600 [577]

Answer:

Hcl

Explanation:

Arrhenius acid - produce H+

Arrhenius base - produce oh -

we can see here in the option B give us H+ which is arrhenius acid

4 0
3 years ago
How does Barium obey the octet rule when reacting
Kryger [21]

Answer:

it gives up electrons B. because the bond between the electrons is not very strong due to how few of them there are

Explanation:

7 0
3 years ago
Read 2 more answers
1) Humans have how many sets of teeth?
Verizon [17]
<span>1) Humans have how many sets of teeth?

C) 4

2) Adults have how may permanent teeth?

B) 32

3) What type of food products make teeth stronger?

Cheese and Yogurt

4) What is the visible part of the tooth?

C) crown



5) What part of the tooth is harder than bone?

D) dentin


6) What part of the tooth is soft and contains the nerves?
A) pulp


7) What refers to the alignment of the teeth?
</span><span>
Occlusion</span><span>

8) The lower teeth protect what?

D) tongue


9) Malocclusion is the least common reason for referral to orthodontists.

False



10) Usually, malocclusion is hereditary.
True


11) Which type of malocclusion is commonly referred to as an overbite?

Class Two

12) Bacteria are living organisms than cause cavities.
True




13) What is the whitish film that grows on your teeth called?

Plaque 

14) What is the best fighter of cavities?

Fluoride

Gingivitis is the inflammation of the
A) gums



16) Gingivitis is permanent.

False


17) Name 2 ways to fight gingivitis.

Proper Toothbrushing and Flossing
</span>Professional Dental Cleanings<span>

18) The cause of gum disease is

B) bacteria



19) Untreated, periodontitis will progress until your teeth loosen and fall out.
True


</span>
6 0
3 years ago
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