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3 years ago

I need help with science

Chemistry

2 answers:

Salsk061 [2.6K]3 years ago

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Need more information

GalinKa [24]3 years ago

3 0

Answer:

1. The difference between passive and active transport is passive transport is when a place is not busy, and people are just passing around. Active transport however, is people are rushing, shoving, each other around, and where a place is really busy and wild.

2. Active transport: energy needed: yes; structures involved: airports, buildings; examples; people on a train or squashed space.

Passive transport: energy needed: no; structures involved: suburbs, sidewalks; examples: people walking on a sidewalk on open space.

Explanation:

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Group 7a of the periodic table contains the

ohaa [14]

A.) Most reactive non-metals

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3 years ago

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A 225. mL sample 3.5M solution of KBr is diluted to a final volume of 750. mL. What is the final concentration of this solution?

Allushta [10]

C= comcentration
V= volume
C1*V1=C2*V2
3.5M*225.mL = xM*750 mL
x=(3.5*225/750) =1.05M≈1.1M

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4 years ago

Consider the reaction for the combustion of benzene: 2 C6H6(g) 15 O2(g) ---> 12 CO2(g) 6 H2O(l) What mass of H2O is produced

irakobra [83]

Answer: Mass of water produced is 17.3 grams

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

For benzene:

Given mass of benzene = 25.0 g

Molar mass of benzene= 78 g/mol

Putting values in equation 1, we get:

$\text{Moles of benzene}=\frac{25.0g}{78g/mol}=0.32mol$

The chemical equation for the reaction follows:

$2C_6H_6(g)+15O_2(g)\rightarrow 12CO_2(g)+6H_2O(l)$

As, oxygen is an excess reagent. Thus benzene is considered as a limiting reagent because it limits the formation of product.

By Stoichiometry of the reaction:

2 moles of benzene produces 6 moles of water

So, 0.32 moles of benzene will produce = $\frac{6}{2}\times 0.32=0.96moles$ of water

Now, calculating the mass of water from equation 1, we get:

Molar mass of water= 18 g/mol

Moles of water = 0.96moles

Putting values in equation 1, we get:

$0.96mol=\frac{\text{Mass of water}}{18g/mol}\\\\\text{Mass of water}=17.3g$

Thus mass of water produced is 17.3 grams

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3 years ago

In the reaction K2CrO4(aq) + PbCl2(aq) → 2KCl(aq) + PbCrO4(s), how many grams of PbCrO4 will precipitate out from the reaction b

Elodia [21]

The balanced chemical reaction is:

K2CrO4(aq) + PbCl2(aq) → 2KCl(aq) + PbCrO4(s)

We are given the amount of the reactants to be used for the reaction. These amounts will be the starting point of our calculations.

3.0 M K2CrO4 (.500 L) = 1.5 mol K2CrO4

1.5 mol K2CrO4 (1 mol PbCrO4 / 1 mol K2CrO4) ( 323.2 g/mol)=484.8 grams PbCrO4

Therefore, the best answer from the choices is 480 grams.

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3 years ago

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Answer:

Explanation:

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3 years ago