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KATRIN_1 [288]
3 years ago
13

How many significant figures are in these numbers ​

Chemistry
1 answer:
jenyasd209 [6]3 years ago
8 0

Answer:

9

Explanation:

a significant number is a non zero number or exponent or a zero between numbers

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Which answer defines exothermic reaction?
kicyunya [14]

The answer which  defines  exothermic  reaction is

a process  in which  energy  is released as heat ( answer A)


 <u><em>Explanation</em></u>

 Exothermic reaction  is a chemical reaction in which  energy is released into environment in form of heat.

<u> For example  of exothermic reaction</u>

Is a combustion reaction such as lighting a candle whereby  oxygen react with wax to produce carbon (iV)  oxide, water and heat.

 

8 0
4 years ago
Read 2 more answers
B
Gemiola [76]

Answer:  1. magnesium hydroxide + sulfuric acid = magnesium sulphate + water

2. calcium hydroxide + hydrochloric acid = calcium  chloride + water

3. lead hydroxide + nitric acid =  lead nitrate + water

4. sodium hydroxide + sulfuric acid  =  sodium sulphate + water

5. potassium hydroxide + citric acid = potassium  citrate + water

6. silver hydroxide + hydrochloric acid = silver chloride + water

7.  aluminium hydroxide + phosphoric acid = aluminium phosphate + water

Explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.  

The balanced chemical equations are :

1. magnesium hydroxide + sulfuric acid = magnesium sulphate + water

Mg(OH)_2(aq)+H_2SO_4(aq)\rightarrow MgSO_4(aq)+2H_2O(l)

2. calcium hydroxide + hydrochloric acid = calcium  chloride + water

Ca(OH)_2(aq)+2HCl(aq)\rightarrow CaCl_2(aq)+2H_2O(l)

3. lead hydroxide + nitric acid =  lead nitrate + water

Pb(OH)_2(aq)+2HNO_3(aq)\rightarrow Pb(NO_3)_2(aq)+2H_2O(aq)

4. sodium hydroxide + sulfuric acid  =  sodium sulphate + water

NaOH(aq)+H_2SO_4(aq)\rightarrow Na_2SO_4(aq)+H_2O(l)

5. potassium hydroxide + citric acid = potassium  citrate + water

KOH(aq)+C_6H_8O_7(aq)\rightarrow C_6H_7O_7K(aq)+H_2O(l)

6. silver hydroxide + hydrochloric acid = silver chloride + water

AgOH(aq)+HCl(aq)\rightarrow AgCl(s)+H_2O(l)

7.  aluminium hydroxide + phosphoric acid = aluminium phosphate + water

Al(OH)_3(aq)+H_3PO_4(aq)\rightarrow AlPO_4(aq)+3H_2O(l)

3 0
3 years ago
I need help with number 23
kykrilka [37]
It's asking what are the conditions of the water when the three types of fishes overlap. the three kids of fishes overlap over in the middle which is D. mild temperatures, some suspended particles, flows at medium speed.
8 0
3 years ago
Iron-59 is used in medicine to diagnose blood circulation disorders. The half life of iron-59 is 44.5 days. How much of a 2.000
kolezko [41]

Answer:

0.258 mg of iron remains.

Explanation:

To solve this problem we can use the formula

M₂ = M₀ * 0.5^{\frac{t}{44.5} }

Where M₂ is the mass remaining, M₀ is the initial mass, and t is time in days.

Using the data given by the problem:

M₂ = 2.000 mg * 0.5^{\frac{133.5}{44.5} }

M₂ = 0.258 mg

7 0
3 years ago
What kind of solution would have a ka value that is much less than 1?
liberstina [14]

Answer:

D. A weakly acidic solution.

4 0
3 years ago
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