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Nikitich [7]
3 years ago
9

Use the drop-down menus to answer the questions.

Chemistry
2 answers:
lawyer [7]3 years ago
8 0

Answer:helium

Explanation:

I just did it

marissa [1.9K]3 years ago
6 0

Answer: Protons , Neutrons , and Helium

Explanation:

The number of protons is the atomic number, and the number of protons plus neutrons is the atomic mass. For hydrogen, the atomic mass is 1 because there is one proton and no neutrons. For helium, it is 4: two protons and two neutrons.

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List at least 3 factors that can influence a body's temperature after death.
Slav-nsk [51]

multiply answers

ventilation

humidity

insulation

surface temperature

Explanation:

ventilation-well ventilated room could increase the body's cooling process

humidity-being in a humid location could cool the body at a slower rate

insulation-a body wrapped in something will cool slower then one not

surface temperature-a body on a hit surface will cool slower than one on a cold surface

3 0
3 years ago
A 0.2 M carboxylic acid (RCOOH) has a Ka = 1.66x10-6. What is the pH of this solution? Enter to 2 decimal places.
maria [59]

Answer:

3.24

Explanation:

The dissociation equation for the carboxylic acid can be represented as follows:

RCOOH —-> RCOO- + H+

We can use an ICE table to get the value of the concentration of the hydrogen ion. ICE stands for initial, change and equilibrium.

RCOOH RCOO- H+

Initial 0.2 0.0. 0.0

Change -x +x. +x

Equilibrium 0.2-x. x. x

We can now find the value of x as follows:

Ka = [RCOO-][H+]/[RCOOH]

(1.66* 10^-6) = (x * x)/(0.2-x)

(1.66 * 10^-6) (0.2-x) = x^2

x^2 = (3.32* 10^-7) - (1.66*10^-6)x

x^2 + (1.66 * 10^-6)x - (3.32* 10^-7) = 0

Solving the quadratic equation to get x:

x = 0.0005753650094369094 or - 0.0005753650094369094

As concentration cannot be negative, we discard the negative answer

Hence [H+] = 0.0005753650094369094

By definition, pH = -log[H+]

pH = -log(0.0005753650094369094)

pH = 3.24

8 0
3 years ago
What is an ion and how does it form? What are the two types of ions
vladimir2022 [97]

Answer:

Ions form when an atom gains or loses electrons in order to find a more stable configuration.There are two types of ions cations and anions

Explanation:

hope this helps if not let me know have a blessed day

4 0
2 years ago
The due date is in a few minutes please I need help!!
umka21 [38]

Answer:

“A” since liquid has to above 32F

6 0
3 years ago
Explain how the valence electrons are related to the element's period.
AlekseyPX

Answer:

The number of valence electrons in an atom is reflected by its position in the periodic table of the elements (see the periodic table in the Figure below). Across each row, or period, of the periodic table, the number of valence electrons in groups 1–2 and 13–18 increases by one from one element to the next

5 0
3 years ago
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