hòa tan hết 13 gam zinc cần dùng hết 14,6 gam hydrochloric acid HCL, sau phản ứng thu được 27,2 gam zinc chloride (ZnCl2 ) và a gam khí hydrogen. Tính a

Lực ma sát sinh ra giữa viên phấn và mặt bảng khi ta viết bảng.

Lực ma sát này có lợi gì?

Nêu biện pháp để làm tăng lực ma sát này.

Decide if the sentences are correct or incorrect. YOU HAVE ONLY ONE ATTEMPT FOR THIS EXERCISE.10 points possible (graded)

 Will you get married after leaving a university?

I was at gas station when you called me.CorrectIncorrectunansweredI left work at 4pm today.

They are opening the new hair salons here.

unansweredI’m sure that he’s not at home now.

Come sit at table and eat your breakfast.

I was returning home from the school when I saw her.

They went out to play the golf.

The experience is a necessary criterion in recruiting.

The cover of this book is beautiful.

Incorrect or correct

Decide if the sentences are correct or incorrect. YOU HAVE ONLY ONE ATTEMPT FOR THIS EXERCISE.10 points possible (graded)

 Will you get married after leaving a university?

I was at gas station when you called me.CorrectIncorrectunansweredI left work at 4pm today.

They are opening the new hair salons here.

unansweredI’m sure that he’s not at home now.

Come sit at table and eat your breakfast.

I was returning home from the school when I saw her.

They went out to play the golf.

The experience is a necessary criterion in recruiting.

The cover of this book is beautiful.

Incorrect or correct

Decide if the sentences are Correct or Incorrect. YOU HAVE ONLY ONE ATTEMPT FOR THIS EXERCISE.10 points possible (graded) 

There is the green English book on the desk.Correct or Incorrectunanswered

They've got a idea.Correct or Incorrectunanswered

This is an expensive bike.Correct or Incorrectunanswered

Look! There's a bird flying.Correct or Incorrectunanswered

She is a honest person.Correct or Incorrectunanswered

This is the coffee cup that I want.Correct or Incorrect

unansweredHe has such the interesting job.Correct or Incorrectunanswered

The apple a day keeps the doctors away.Correct or Incorrectunanswered

The restaurant we usually eat at has closed down.Correct or Incorrect

unansweredDo you know a man standing over there?Correct or Incorrectunanswered

inside/usually/of/hour./you/an/an/answer/They/give/can

he/bars/a/behind/never/for/crime/years/three/The/did/committed./guy

There is some milk in the fridge.

The food was placed on the table.

She lost her ring at the beach.

He swam into the lake.

He is on the phone right now.

I wear a ring to my finger.

There is a party at the club house.

She always reads newspapers at the morning.

She looked me directly at the eyes.

Some sentences is correct or incorrect

Unscramble these sentences. Pay attention to capitalization and punctuation.10 points possible (graded) 

from/a/we/if/We/view/walk/fast/get/can/enough./there

I/say/there's/between/a/connection/must/us.

wait/new/baby./the/I/for/can/hardly

check/your/should/going/You/phone/battery/out./before

reach/each/you/other./that's/can/way/Sometimes/the/only

on/your/can't/letting/take/mess./of/care/go/people/You

tonight/I/so/rest./with/stay/can/will/you/you

twice./be/She/answers/can't/the/checked/already/right/because/I

wanted/to/can/she/I/me./imagine/you/why/tell

tea./can/make/I/cakes/and/some/you