3 years ago

HELP!!! PLEASE!! I don't know this one question!!!

Chemistry

1 answer:

lara31 [8.8K]3 years ago

8 0

Lead(II) Sulfate, the second answer

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A students drawing of a nitrogen atom is shown. What change would make the model more accurate?

zubka84 [21]

Answer:

C - show 7 neutrons in the nucleus

Explanation:

Use process of elimination:

-Answer A will not work because electrons are not in the nucleus.

-Answer B will change the atom's identity from nitrogen to fluorine; it will not work.

-Answer D will create a nitrogen ion, which is not what the prompt is asking for (an atom); it will not work.

The only logical answer is C, as that is the only one that is also true.

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3 years ago

What is the Mechanical advantage of a machine that only changes the direction of the force?

Sloan [31]

Answer: 1

Explanation:

The number of times a machine increases a force exerted on it The input force will be the same as the output force.

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3 years ago

What are the rules for writing

Assoli18 [71]

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3 years ago

If a gas is cooled from 343.0 K to 283.15 K and the volume is kept constant what final pressure would result if the original pre

mario62 [17]

Answer:

627.4 mmHg

Explanation:

From Gay-Lussac law:

$\frac{p1}{t1} = \frac{p2}{t2}$

p1 = 760 mmHg

t1 = 343 K

t2=283.15 K

$p2 = p1 \times \frac{t2}{t1}$

$p2 = 760 \times \frac{283.15}{343.0}$

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3 years ago

Write dissociation equations for the following soluble salts dissolving in water. Then draw a particle - level representation fo

zhuklara [117]

Answer:

The dissociation equations for NaBr gives Na+ and Br-

The dissociation equations for ZnCl2 gives Zn2+ and 2 Cl-

Explanation:

The following pictures shows that the dissociation of one particle of NaBr produces one particle of Na+ (sodium cation) and one particle of Br- (bromine anion).

The dissociation of one particle of ZnCl2 produces one particle of Zn+2 (Zinc cation) and two particles of Cl- (chlorine anion).

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3 years ago