Why do scientists need control groups?

A beaker about two-thirds full of a liquid. check all that apply. pour using tongs. wear chemical resistant gloves. taste to make sure it is hcl. One should wear chemical resistant gloves.

It is not at all possible to pour the liquid with the help of tongs because it may spill and cause harm, in case it is hazardous.

Also tasting whether the liquid is hcl or not is not gonna help because we don't know whether the chemical is fatal or not. Even if it is Hcl, tasting it is not a good option, because it will cause damage to our tongue and other parts of mouth.

Thus the most convenient thing to do is to wear chemical resistant gloves to ensure safety.

To learn more about chemical here

brainly.com/question/23693316

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4 0

2 years ago

Read 2 more answers

Write a letter to your uncle describing your study

mafiozo [28]

Explanation:

Date: 

Dear uncle, 

 

 I am fine and happy here though specific things are challenging. I am writing this letter to you to tell you my experiences. 

I don't know what happened to me suddenly. I never used to like maths or physics before in 9th. I had developed intersted and love towards physics and maths. The teachers of math and physics are awesome too. I don't know how I have changed this much. But there are some problems I an facing . I don't like social and biology because they are very hard to learn but physics and mathematics are very easy. I am confused in the topic of subject choice for 11th grade. Anyways, I hope to hear from you very soon. Please give me some tips too. 

Convery my regards to aunt and cousins. 

 Your lovingly, 

 Name of yours, 

I hope it will help you so. 

✌✌✌✌

7 0

3 years ago

If 3a+b/b=7/5 what is the value of a/b

neonofarm [45]

Answer:

a/b= 2/15

Explanation:

3a +b

----------- = 7/5

b

<h2>now cross multiple both side</h2>

5(3a+b)=7 x b

15a +5b = 7b

15a = 7b-5b

15a = 2b

15a/2b = 1

a/b x 15/2 =1

<h3>multiple both side by 2/15</h3>

we get,

a/b = 2/15

hope you have no doubt now !

4 0

3 years ago