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kati45 [8]
3 years ago
8

One study indicated that if a paint chip were to match a paint chip from a known sample (say a suspect’s car), there is only a 1

in 33,000 chance that the paint chip came from another random vehicle.
Chemistry
1 answer:
OlgaM077 [116]3 years ago
8 0
The statement above is TRUE.
The statement that is given above implies that, if a paint sample matches another known sample from a vehicle, that does not indicate that the paints come from the same source but it does show a very high probability that the paint samples come from the same object, if the compositions of the paint samples are the same.
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How many protons, neutrons, and electrons are there in an atom of (a) 10B5, (b) 36Ar, (C) 85Sr38, and (d) carbon-Il?
astraxan [27]

Answer:

Here's what I get.

Explanation:

The isotopic symbol for an atom is

\rm _{Z}^{M}A

The atomic number (Z) is the number of protons (p) in the nucleus.

In a neutral atom, the number of electrons (e) equals the number of protons. n = e

The mass number (A) is the number of protons plus the number of neutrons (n).

A = p + n or

n = A - p

(a) \rm _{5}^{10}B

p = 5

e = 5

n = 10 - 5 = 5

(b) \rm _{18}^{36}Ar

p = 18

e = 18

n = 36 - 18 = 18

(c) \rm _{38}^{85}Sr

p = 38

e = 38

n = 85 - 38 = 47

(d)\rm _{6}^{11}C

p = 5

e = 6

n = 11 - 6 = 5

5 0
4 years ago
if 2 grams of element x combine with 4 grams of element y to form compound xy how many grams of element y would combine with 34
geniusboy [140]
Please i need answers

8 0
3 years ago
42 Which statement explains why a CO2 molecule is nonpolar?(1) Carbon and oxygen are both nonmetals.
Mama L [17]
The answer is (3)
 I always use the acronym SNAP
S- symmetrical is
N- Non-polar
A- asymmetrical is
P-Polar
7 0
3 years ago
Read 2 more answers
Which pair of elements are the most similar? A. Ca and F B. Na and Cl C. Ne and Ar D. K and Ca
Vinil7 [7]

Answer:

c

Explanation:

8 0
3 years ago
A solution is made using 200.0 mL of methanol (density 0.792 g/mL) and 985.1 mL of water (density 1.000 g/mL). What is the mass
DaniilM [7]

<u>Answer:</u> The mass percent of methanol in solution is 13.85 %

<u>Explanation:</u>

To calculate the mass of water, we use the equation:

\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}

  • <u>For water:</u>

Density of water = 1.000 g/mL

Volume of water = 985.1 mL

Putting values in above equation, we get:

1.000g/mL=\frac{\text{Mass of water}}{985.1mL}\\\\\text{Mass of water}=(1.000g/mL\times 985.1mL)=985.1g

  • <u>For methanol:</u>

Density of methanol = 0.792 g/mL

Volume of methanol = 200.0 mL

Putting values in above equation, we get:

0.792g/mL=\frac{\text{Mass of methanol}}{200.0mL}\\\\\text{Mass of methanol}=(0.792g/mL\times 200.0mL)=158.4g

To calculate the mass percent of methanol, we use the equation:

\text{Mass percent of methanol}=\frac{\text{Mass of methanol}}{\text{Mass of solution}}\times 100

Mass of solution = [158.4 + 985.1] g = 1143.5 g

Mass of methanol = 158.4 g

Putting values in above equation, we get:

\text{Mass percent of methanol}=\frac{158.4g}{1143.5g}\times 100=13.85\%

Hence, the mass percent of methanol in solution is 13.85 %

3 0
3 years ago
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