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skad [1K]
3 years ago
12

Which of the following correctly describes the role of scientific models in the advancement of technology? Models represent the

basic facts. Models are educated guesses that can be tested. Models help us better understand the phenomena. Models answer specific questions about phenomena.
Chemistry
1 answer:
Nikitich [7]3 years ago
3 0
Models help us better understand the phenomena
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1. BaBr2(aq) + H2SO4(aq) →?<br> please balance the equation and predict the products
Andrew [12]

Answer:

BaBr2 (aq) + H2SO4 (aq) → BaSO4 (s) + 2 HBr (aq)

Explanation:

This is a precipitation reaction: BaSO4 is the formed precipitate.

4 0
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How many moles are in 1.20 x 10^21 atoms of Phosphorus?
Ludmilka [50]

Answer:

You would get 19.969 moles

Explanation:

8 0
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Suppose that a substance in a beaker is heated over a burner in a science lab. Which observation would most likely indicate that
victus00 [196]

Answer:

D

Explanation:

the production of an odor would indicate that the heat ignited a chemical reaction

6 0
3 years ago
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How many electrons can occupy the 4p sublevel of a neutral atom of bromine
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Answer:

6

Explanation

every p sublevel holds up to 6 electrons

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4 0
2 years ago
What volume will 0.405 g of krypton gas occupy at STP?
Rufina [12.5K]

Answer:

The answer to your question is V = 0.108 L or 108 ml

Explanation:

Data

Volume = ?

mass = 0.405 g

Temperature = 273°K

Pressure = 1 atm

Process

1.- Convert mass of Kr to moles

                  83.8 g of Kr -------------------- 1 mol

                     0.405 g     -------------------  x

                     x = (0.405 x 1) / 83.8

                     x = 0.0048 moles

2.- Use the Ideal gas law to solve this problem

                   PV = nRT

- Solve for V

                      V = nRT / P

- Substitution

                      V = (0.0048)(0.082)(273) / 1

- Simplification

                       V = 0.108 / 1

- Result

                       V = 0.108 L

8 0
3 years ago
Read 2 more answers
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