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3 years ago

7. Two samples of gold must have the same

Chemistry

1 answer:

almond37 [142]3 years ago

6 0

They must have the same density

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Please help me. Chemistry

Wewaii [24]

Answer:

element S is argon and element T is potassium.

4. B

5. D

Explanation:

in an element in periodic table number of elctrons and protons are same.

4. since element S has 18 protons so its atomic number must be 18 so the element is Argon which is the last element of period 4 so the next element will go to period 4 with one extra shell and since the atomic number of next element is 19 the element is Potassium. therefore T is Potassium.

5. number of nucleons in an atom is the number of protons and neutons combined together in an nucleus

8 0

4 years ago

Which part of the electromagnetic spectrum has a higher frequency than ultraviolet light?

Alla [95]

<span>Which part of the electromagnetic spectrum has a higher frequency than ultraviolet light? </span>B. Gamma Rays.

3 0

3 years ago

How many molecules are in<br> 6.0 moles of methane (CH4)?

katen-ka-za [31]

Answer:

${ \tt{1 \: mole = 6.02 \times {10}^{23} \: molecules }} \\ { \tt{6.0 \: moles = (6 \times 6.02 \times {10}^{23}) \: molecules }} \\ = { \bf{3.612 \times {10}^{24} \: molecules}}$

8 0

3 years ago

Given the atomic radius of xenon, 1.3 ?, and knowing that a sphere has a volume of 4?r3/3, calculate the fraction of space that

34kurt

R = 1.3 A° = 1.3 × 10^(-10) m
$v \: = \: \frac{4}{3} \pi {r}^{3}$
$v \: = \: \frac{4}{3} \times 3.1415 \times {(1.3 \times {10}^{ - 10} )}^{3}$
V = 9.20277208×10^(−30) m.

7 0

3 years ago

(N2 & O2 & Ar & CO2...) <br> an element compound or mixture?

ololo11 [35]

Answer: Mixture

Explanation:

Element is a pure substance which is composed of atoms of similar elements.

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.

Mixture is a substance which has two or more components which do not combine chemically and do not have any fixed ratio in which they are present. Example: Air which conatins a mixture of $N_2$ , $O_2$ , $Ar$ and $CO_2$

8 0

3 years ago