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3 years ago

How does water help us live

1 answer:

4 0

Your body uses water in all its cells, organs, and tissues to help regulate its temperature and maintain other bodily functions. Because your body loses water through breathing, sweating, and digestion, it's important to re-hydrate by drinking fluids and eating foods that contain water.

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An object was measured by a worker as 14.6cm long, however, the manufacturer specifications list the length of the object at 14.

mars1129 [50]

it's 0.2cm different from the expected value, wich was 14.6cm

how many percent that are is calculated in the screenshot.

rounded it's 1.37%

4 0

3 years ago

Which substance will evaporate first???????????????????

torisob [31]

Answer:

I think it would be a liquid.

Explanation:

If the temperature hits a certain point, it will turn to ice. If the ice gets exposed to heat, it will melt and return back to it's natural form, a lqiuid. If the liquid is exposed to enough heat, it will evaporate. Not sure if this is right, but I tried my best!

3 0

3 years ago

A student performs a chemical reaction with vinegar and an antacid tablet. Experimental results are displayed in the table

Georgia [21]

Answer:

Explanation:

Please tell me if im wrong

Question 6. 6. In a reaction between vinegar and antacid tablets, the antacid is the limiting reagent. At constant pressure and temperature, three tablets produce 600 cm3 of gas. What volume will two tablets produce?

(Points : 3)

400 cm3

600 cm3

800 cm3

1,200 cm3****

Question 7. 7. You breathe in 3.0 L of pure oxygen at 298 K and 1,000 kPa. How many moles of oxygen did you take in? (Use the ideal gas law: PV = nRT where R = 8.31 L-kPa/mol-K.)

(Points : 3)

0.05 moles

1.21 moles*****

2.42 moles

20.0 moles

Question 8. 8. Consider a gas at STP in a container of 22.4 L. If you apply the ideal gas law, what is the approximate value of n?

(Points : 3)

0.5

8.31

224****

Question 9. 9. Water boils at 100°C. What is that temperature on the Kelvin scale?

(Points : 3)

213 K

325 K****

333 K

373 K

Question 10. 10. The average speeds of gas molecules in cylinders A, B, C, and D are 0.001 m/s, 0.05 m/s, 0.1 m/s, and 0.5 m/s, respectively. Which cylinder contains gas that is closest to absolute zero?

(Points : 3)

C******

I suck at chemistry

4 0

4 years ago

1.5mol C3H8 from C3H8+5O2-->3CO2+4H2O .how many grams of carbon dioxide are produced

koban [17]

Answer:

$\large \boxed{\text{200 g CO}_{{2}}}$

Explanation:

We will need a balanced equation with masses, moles, and molar masses, so let’s gather all the information in one place.

Mᵣ: 44.01

C₃H₈ + 5O₂ ⟶ 3CO₂ + 4H₂O

n/mol: 1.5

1. Calculate the moles of CO₂

The molar ratio is 3 mol CO₂:1 mol C₃H₈

$\rm \text{Moles of CO}_{2} = \text{1.5 mol C$_{3}$H}_{8} \times \dfrac{\text{3 mol CO}_{2}}{\text{1 mol C$_{3}$H}_{8}} =\text{4.5 mol CO}_{2}$

2. Calculate the mass of CO₂.

$\text{Mass of CO}_{2} = \text{4.5 mol CO}_{2} \times \dfrac{\text{44.01 g CO}_{2}}{\text{1 mol CO$_{2}$}} = \textbf{200 g CO}_{\mathbf{2}}\\\text{The reaction will form $\large \boxed{\textbf{200 g CO}_{\mathbf{2}}}$}$

3 0

3 years ago

PLEASE HELP ASAP!!!!!!!!!! WILL GIVE BRAINLIEST TO CORRECT ANSWER!

Natasha2012 [34]

Balance your chemical reaction first. Start by balancing carbon so you have 2 carbons on both sides.

C2H6 + O2 —> 2CO2 + H2O

Now balance your hydrogen so you have 6 hydrogens on both sides.

C2H6 + O2 —> 2CO2 + 3H2O

Now balance your oxygens. You have 7 oxygens on the right and 2 on the left, so multiply O2 by 3.5.

C2H6 + 3.5O2 —> 2CO2 + 3H2O

However, you can’t have a decimal in a coefficient. So, multiply everything by two.

2C2H6 + 7O2 —> 4CO2 + 6H2O

Now use your mole ratio of 6 mol H2O for every 2 mol of C2H6 to solve.

1.4 mol C2H6 • 6 mol H2O / 2 mol C2H6 = 4.2 mol H2O

D) 4.2 moles

3 0

3 years ago