Which of the following UV rays has the highest energy that damages your skin the most?

5. The element copper has naturally occurring isotopes with mass numbers of 63

natali 33 [55]

Answer:

63.616

Explanation:

DATA

1. first atomic mass;m1=63

second atomic mass;m2=65
first percentage;p1= 69.2%
second percentage me;p2=30.8%
average mass;avg= ?

SOLUTION

avg= (m1)(p1) + (m2)(p2)

100

avg= (63)(69.2) + (65)(30.8)

100

avg= 4359.6 + 2002

100

avg= 6361.6

100

avg= 63.616

4 0

2 years ago

Read 2 more answers

The reaction na 3po 4( aq) 3 agno3( aq) → ag 3po 4( s) 3 nano 3( aq) is best classified as a(n):_____.

Ugo [173]

The reaction $Na_{3} PO_{4} ( aq) +3AgNO_{3} (aq)$ → $Ag_{3} PO_{4} ( aq) +3NaNO_{3} (aq)$ is best classified as double displacement reaction.

Those reaction in which two compounds react by exchanges of ions to form two new compounds is called double displacement reaction. The easiest way to identify double displacement reactions is to check to see whether the cations exchanged anions with each other or not . Always balanced chemical equation is used to determine.

There are three types of double displacement reaction which is given as,

Precipitation
Neutralization
Gas formation

The real world example of double displacement reaction is combining vinegar and baking soda to create homemade volcano.

learn more about double displacement reaction

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6 0

1 year ago

A car moves down the street at 45 kph. The driver takes his foot off the gas pedal but does not brake. Which is the correct expl

nexus9112 [7]

Answer: Friction.

Explanation: Even though the driver has taken the foot off thr gas pedal, the acceleration of the car decreases and the friction continues.

The car slows down because the opposite force of friction continues to act and the acceleration in forward direction is continuous decreasing. Hence, the car slows down.

7 0

2 years ago

How many milliliters of a 0.215 molar solution are required to contain 0.0867 mol of NaBr

JulsSmile [24]

Answer: 403ml

Explanation:

$M=\frac{mol}{L}$

Solve for L;

$L=\frac{mol}{M}\\L=\frac{0.0867mol}{0.215M}\\ L=0.403L$

Convert to mililiters

$0.403L(\frac{1000ml}{1L})=403ml$

3 0

2 years ago

When na and s undergo a combination reaction, what is the chemical formula of the product?

kvasek [131]

The Chemica formula of the product is Na2S which is called sodium sulfide. remember that sodium is a metal and all compounds containing a metal are named with the stock system.

5 0

2 years ago