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3 years ago

Of the element listed wich

Chemistry

1 answer:

Nesterboy [21]3 years ago

8 0

The atomic radius trend on the Periodic Table is as follows:

- Atomic radius increases down a column (or group)

- Atomic radius decreases across rows (or periods) from left to right

Looking at my Periodic Table, calcium, chromium, cobalt and copper are in that order from left to right in the same period, which simplifies things significantly.

Since these elements are in the same period, and given that we know atomic radius decreases across periods from left to right, we can see that calcium has the largest atomic radius.

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A person of 82 kg is in an elevator. If the elevator is moving at a speed of 5m/s, what’s the person’s kinetic energy.

andre [41]

Answer:

The person’s kinetic energy is 1,025 J

Explanation:

Kinetic energy is a form of energy. It is defined as the energy associated with bodies that are in motion and this energy depends on the mass and speed of the body.

Kinetic energy is defined as the amount of work necessary to accelerate a body of a given mass and in a position of rest, until it reaches a given speed. Once this point is reached, the amount of accumulated kinetic energy will remain the same unless there is a change in speed or the body returns to its state of rest by applying a force.

Kinetic energy is represented by the following formula:

$Ec=\frac{1}{2}*m*v^{2}$

where Ec is kinetic energy, which is measured in Joules (J), m is mass measured in kilograms (kg), and v is velocity measured in meters over seconds (m/s).

In this case:

Ec= ?
m= 82 kg

v= 5 $\frac{m}{s}$

Replacing:

$Ec=\frac{1}{2}*82 kg*(5\frac{m}{s} )^{2}$

Solving:

Ec= 1,025 J

<u><em>The person’s kinetic energy is 1,025 J</em></u>

3 0

3 years ago

An overhead view of two people at the start of a maze. The person in a purple shirt has a line running forward, right, backward,

Lubov Fominskaja [6]

Answer:

Zamir walked

meters and Talia walked

meters.

Explanation:

27 and 19

8 0

3 years ago

Read 2 more answers

Need help ASAP!!!! Will give brainliest!!

erik [133]

for one you could do a bell, ringing noise, then say someone rang it.

For two you could do tunnel, echoing, then say someone yelled and it echoed.

for three you could do a bowl, ringing, spoon hitting it

hope i could help

4 0

4 years ago

Which of the following are homogeneous solutions?

Helga [31]

I think it might be sugar water because that’s a mix of two different elements

8 0

4 years ago

Read 2 more answers

Write a balanced half-reaction describing the reduction of gaseous dichlorine to aqueous chloride anions.

Annette [7]

Answer:- $Cl_2(g)+2e^-\rightarrow 2Cl^-(aq)$

Explanations:- In reduction the electrons are accepted and so they are written on the reactant side. When an atom accepts electrons then it forms anion. Chlorine has 7 valence electrons and it needs one more electron to complete it's octet. Since, dichlorine has two Cl atoms and each Cl atom needs one more electron to complete it's octet, two electrons are accepted by dichorine to make aqueous chloride ion. For balancing the equation, there would be two chloride ions as the reactant side has two chlorine atoms.

$Cl_2(g)+2e^-\rightarrow 2Cl^-(aq)$

4 0

3 years ago