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3 years ago

How does an object in motion stay in motion unless acted upon by an unbalanced force

1 answer:

7 0

An object in motion will remain in motion at a constant speed and in the same direction unless acted on by an unbalanced force. An object at rest will remain at rest unless acted upon by an unbalanced force. The acceleration of an object depends on the mass of the object and the amount of force applied to it.

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What are 3 adaptations that help humans have differential survivability

shutvik [7]

1. Lactose tolerance in adulthood. Lets an adult drink cow milk without getting gassy or feeling sick. Cow milk has all sorts of good stuff in it and probably drinking it can help a woman support a pregnancy.

2. Sickle cell anemia allele. The heterozygotes don't die of malaria or sickle cell anemia. This is a "heterozygote advantage" in parts of the world where mosquitoes carry malaria. 

3. Straight black hair. Sexual selection decoration (historical). People in parts of Asia who had blond or white hair could never get married -- they were discriminated agains

6 0

3 years ago

Now examine the reaction between iron(III) chloride and sodium hydroxide. Use 60 g NaOH and add FeCl3. What mass in grams of FeC

NISA [10]

Answer: The mass of iron (III) chloride that must be added is 81.1 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 NaOH:

Given mass of NaOH = 60 g

Molar mass of NaOH = 40 g/mol

Putting values in equation 1, we get:

$\text{Moles of NaOH}=\frac{60g}{40g/mol}=1.5mol$

The chemical equation for the reaction of iron (III) chloride and NaOH follows:

$FeCl_3+3NaOH\rightarrow Fe(OH)_3+3NaCl$

By Stoichiometry of the reaction:

3 moles of NaOH reacts with 1 mole of iron (III) chloride

So, 1.5 moles of NaOH will react with = $\frac{1}{3}\times 1.5=0.5mol$ of iron (III) chloride

Now, calculating the mass of iron (III) chloride from equation 1, we get:

Molar mass of iron (III) chloride = 162.2 g/mol

Moles of iron (III) chloride = 0.5 moles

Putting values in equation 1, we get:

$0.5mol=\frac{\text{Mass of iron (III) chloride}}{162.2g/mol}\\\\\text{Mass of iron (III) chloride}=(0.5mol\times 162.2g/mol)=81.1g$

Hence, the mass of iron (III) chloride that must be added is 81.1 grams

8 0

4 years ago

What are some good puns about elements in chemistry?.

anastassius [24]

Answer:

When all the elements die, we Barium!

Ugh, I need to zinc of new Chemistry puns…

Oxygen and Magnesium are going out? O Mg!

Don't trust atoms! They make up everything!

5 0

2 years ago

What element forms an ion with an electronic configuration of 1s22s22p63s23p63d104s24p64d105s25p6 (or [xe]) and a –2 charge?

BabaBlast [244]

The appropriate response would be Tellurium. For the reason that it can receive a - 2 charge, and when it grabs two electrons, it fills the 5p shell with six electrons, so it will have the electronic arrangement of [Xe]. It cannot be Barium since if it loses two electrons, it will get the electronic configuration of [Xe] when it loses the 6s2 electrons, but it will be a +2 cation, not an anion.

8 0

4 years ago

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How does ground water become polluted

solniwko [45]

Ground Water can become polluted from when fossils and things make their way to the bottom of the ground and polluted the ground water

3 0

3 years ago

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