1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
koban [17]
3 years ago
8

A fifth-grade science class puts half of a white tablet in a test tube with 10 milliliters (mL) of water at 21°C (70°F). The tab

let bubbles rapidly for three minutes until it is gone. Students record the final temperaturo at 20°C (637)
Which choice best identifies evidence that a chemical reaction occurred?
tablet was white
tablet broke in hall
tablet dissolved in the water
change in water temperature
Chemistry
1 answer:
hichkok12 [17]3 years ago
5 0

Answer:

change in water tempreture.

Explanation:

You might be interested in
True or False: Marijuana/Cannabis causes physical dependence
makkiz [27]

Answer:

False

Explanation:

It is psychological for you do not depend on it to live.

4 0
3 years ago
Significant digits are the number of digits that reflect the precision of a measurement or number.
Delvig [45]

Answer:

True

Explanation:

Significant digits are numbers that helps to present the precision of measurements calculations.

Numbers that do not contribute to the precision of a reading should not be counted as significant.

There are rules of assigning significant numbers:

  • Leading or trailing zeros are insignificant and should only be counted as a place holder.
  • All non-zero digits are significant
  • Zeroes between non-zero digits are significant.
  • Leading zeros in a decimal are significant before the number.
  • All the numbers in a scientific notation are significant.
5 0
3 years ago
A radioactive substance of mass 768g has a half life of 3 years. After how many years does it leave only 6g undecayed?​
vagabundo [1.1K]

Answer:

The answer is 21 years.

Explanation:

7×3

8 0
3 years ago
Read 2 more answers
In an experiment, 4.14 g of phosphorus combined with chlorine to produce 27.8 g of a white solid compound. what is the empirical
Umnica [9.8K]

Grams of Phosphorus = 4.14 grams 
Grams of white compound = 27.8 grams 
Grams of Chlorine would be = 27.8 - 4.14 = 23.66 grams
 Calculating moles which would be grams / molar mass
 Molar mass of P = 30.97 grams / moles; Molar mass of Cl = 35.45 grams / moles
 Moles of Phosphorus = 4.14 grams / 30.97 grams / moles = 0.1337 moles
 Moles of Chlorine = 23.66 grams / 35.45 grams / moles = 0.6674 moles
 Calculating the ratios by dividing with the small entity
 P = 0.1337 moles / 0.1337 moles = 1
 Cl = 0.6674 moles / 0.1337 moles = 5 
So the empirical formula would be PCl5
3 0
3 years ago
What type of chemical reaction involves 2 or more elements combining to form one?
Vikki [24]
Hey there!

I believe the answer is Combination (or Synthesis) Reaction. 
6 0
3 years ago
Other questions:
  • Helpz mez plzz pwzzzzz
    15·1 answer
  • Can someone explain to me about electrolisis (chemistry form 4)
    5·1 answer
  • Why do most sidewalks have cracks in them every few feet?
    5·2 answers
  • What is the (a) frequency and (b) wavelength (in nm) of a source of purple light at the edge of the visible light spectrum?
    10·1 answer
  • When a candle burns it produced 41,300 Joules per 1 gram. Use dimensional analysis to convert this to Calories per pound.
    14·1 answer
  • The H30+ concentration of a solution is equal to 0.8 M. What is the pH of the solution?
    7·1 answer
  • What block does sodium belong to? s-block p-block d-block or f-block
    9·2 answers
  • Where does the Earth get most of its energy from?
    5·2 answers
  • PLEASE HURRY IM TIMED I WILL GVE BRAINLIEST IF CORRECT
    8·1 answer
  • Circle all that apply for an anion.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!