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4 years ago

NEED HELP ASAP PLEASE!!!!

Chemistry

1 answer:

posledela4 years ago

7 0

D or c because it is they are only two to have gases and let them escape

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Behind your house, there's a gorgeous pond filled with frogs. You notice that the frogs behind Mr. Archer's house often have thr

borishaifa [10]

Answer:

Group B is the control group

Explanation:

In an experiment, a control group is the standard to which comparisons are made in an experiment.

4 0

3 years ago

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? ________

LiRa [457]

The given question is incomplete. The complete question is :

What is the coefficient of $H_2O$ when the following equation is properly balanced with the smallest set of whole numbers? $PCl_3(l)+H_2O(l)\rightarrow H_3PO_3(aq)+HCl(aq)$

Answer: The coefficient of $H_2O$ is 3

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The balanced chemical reaction is:

$PCl_3(l)+3H_2O(l)\rightarrow H_3PO_3(aq)+3HCl(aq)$

The coefficient of $H_2O$ is 3

7 0

3 years ago

Consider the following balanced thermochemical equation for a reaction sometimes used for H2S production:

fgiga [73]

Answer:

d. Heat is released from the reaction

Explanation:

A negative enthalpy change indicates that it is an exothermic reaction. Exothermic reactions release heat.

5 0

3 years ago

Aly's science class was looking at bacteria through a microscope. Aly's teacher said some bacteria can be as small as 0.00365 cm

olga nikolaevna [1]

Answer:

$0.00365\ cm=3.65\times 10^{-3}\ cm$

Explanation:

Aly's teacher said some bacteria can be as small as 0.00365 cm long.

In this problem, we need to write the length of the bacteria written in scientific notation. Any number can be written in the form of scientific notation as follows :

$N=a\times 10^b$

a is a real no and b is an integer

In the given number, there are two zeroes before 3. We need to shift the decimal after 3. It can be done as follows :

$0.00365\ cm=3.65\times 10^{-3}\ cm$

Hence, this is the required solution.

8 0

3 years ago

What is colligative property? why does theproperty changes the way that it does when the amount of solute is increased. State an

elena-14-01-66 [18.8K]

Colligative properties are those substances that depend on the number of substances in the solution, not in the identity of that substance. The property changes the way that it does when the amount of solute is increased because it enables the solute to be scattered more. For example, the freezing point of salt water is lower than that of the pure water due to the salt ions present in water.

6 0

3 years ago