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3 years ago

HELP ASAP

Chemistry

1 answer:

Vedmedyk [2.9K]3 years ago

6 0

Because they are Isotopes thats why because isotopes have the same atomic number but diffrent mass number

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I need #03, #06, #08, #09, #15, #17

Volgvan

3) Volume is the amount of space an object takes up.

6) Gallons and inches are customary units of measurement, while (grams, kilograms, meters, centimeter, milliliter) are metric units of measurements.

8) When using a thermometer, the liquid goes up in the tube when the temperature increases. The liquid goes down in the tube when the temperature decreases.

9) The instrument used to find the volume of a liquid is a graduated cylinder.

15) Units of measurement that can be used to measure mass are called grams and kilograms.

17) The temperature is measured in Fahrenheit in the customer system and Celsius in the metric system.

7 0

3 years ago

When 2.5g of copper sulphate are dissolved in 500ml of water, the concentration of the solution is

GREYUIT [131]

V(H₂O)=500 mL
p(H₂O)=0.9982 g/mL

m(H₂O)=V(H₂O)p(H₂O)

mass of salt solution:
m=m(H₂O)+m(CuSO₄)=V(H₂O)p(H₂O)+m(CuSO₄)

w = m(CuSO₄)/m

w=m(CuSO₄)/{V(H₂O)p(H₂O)+m(CuSO₄)}

w=2.5/{500*0.9982+2.5}=0.004984 (0.4984%)

3 0

3 years ago

Identify the kinds of ions that form each ionic compound

stepladder [879]

Ionic compounds are formed by a positive ion called cation and a negative ion called anion.

I will show you some examples:

NaCl is formed by the cation Na+ and the anion Cl -

CaF2 is formed by the cation Ca 2+ and the anion F -

Li2O if formd by the cation Li + and the anion O 2-.

To tell that you use the oxidation number of each element. I did it this way

Ca F2 => Ca has oxidation number 2+ and F has oxidation number 1- then the ions have that very same charge number.

4 0

4 years ago

A 3.452 g sample containing an unknown amount of a Ce(IV) salt is dissolved in 250.0-mL of 1 M H2SO4. A 25.00 mL aliquot is anal

SOVA2 [1]

Answer:

1,812 wt%

Explanation:

The reactions for this titration are:

2Ce⁴⁺ + 3I⁻ → 2Ce³⁺ + I₃⁻

I₃⁻ + 2S₂O₃⁻ → 3I⁻ + S₄O₆²⁻

The moles in the end point of S₂O₃⁻ are:

0,01302L×0,03428M Na₂S₂O₃ = 4,463x10⁻⁴ moles of S₂O₃⁻. As 2 moles of S₂O₃⁻ react with 1 mole of I₃⁻, the moles of I₃⁻ are:

4,463x10⁻⁴ moles of S₂O₃⁻× $\frac{1molI_{3}^-}{2molS_{2}O_{3}^-}$ = 2,2315x10⁻⁴ moles of I₃⁻

As 2 moles of Ce⁴⁺ produce 1 mole of I₃⁻, the moles of Ce⁴⁺ are:

2,2315x10⁻⁴ moles of I₃⁻× $\frac{2molCe^{4+}}{1molI_{3}^-}$ = 4,463x10⁻⁴ moles of Ce(IV). These moles are:

4,463x10⁻⁴ moles of Ce(IV)× $\frac{140,116g}{1mol}$ = 0,0625 g of Ce(IV)

As the sample has a 3,452g, the weight percent is:

0,0625g of Ce(IV) / 3,452g × 100 = 1,812 wt%

I hope it helps!

5 0

3 years ago

Which of these is an environmental effect of burning fossil fuels and pesticides from farming

Anna11 [10]

A. smog
B. Use a large amount of water
C. increased temperatures
D. poisoning wildlife

The correct answer is D) poising wildlife. Burning fossil fuels and pesticide from farming have the effect of releasing toxic elements in nature, thus the consequences of poisoning wildlife. The fossil fuels released CO2 and other particulates that threats the respiration system of most animals, while the pesticide that animals ingest or breath can have different effects on the wildlife, depending on the type of pesticide.

4 0

3 years ago

Read 2 more answers