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3 years ago

The name of the ion P3- is phosphoride ion. True False

1 answer:

5 0

I believe that it would be false. The name of the ion P3- is not phosphoride ion but it is phosphide ion. The phosphide ion is P 3−, and phosphides of almost every metal in the periodic table are known. They exhibit a wide variety of chemical and physical properties. Hope this answers the question.

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WHEN A SOCCER PLAYER KICKS A BALL, THE BALL ACCELRATES. EXPLAIN WHAT CAUSES THIS ACCELERATION IN TERMS OF FORCES?

Nana76 [90]

Answer:

When we kick the ball, the force we apply to it causes it to accelerate from a speed of 0 to a speed of dozens of kilometers per hour. When the ball is released from the foot, it begins to decelerate (negative acceleration) due to the force of friction that is exerted upon it (as we observed in the previous example).

Explanation:

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3 years ago

Questions

Ulleksa [173]

Answers:

See below

Step-by-step explanation:

1. Most food energy

(a) Pringles

Heat from Pringles + heat absorbed by water = 0

m₁ΔH + m₂CΔT = 0

1.984ΔH + 100 × 4.184 × 18 = 0

1.984ΔH + 7530 = 0

ΔH = -7530/1.984 = -3800 J/g

(b) Cheetos

0.884ΔH + 418.4 × 13 = 0

ΔH = -5400/0.884 = -6200 J/g

Cheetos give you more food energy per gram.

(c) Snickers

Food energy = 215 Cal/28 g × 4184 J/1 Cal = 32 000 J/g

The food energy from Cheetos is much less than that from a Snickers bar

2. Experimental uncertainty

The experimental values are almost certainly too low.

Your burning food is heating up the air around it, so much of the heat of combustion is lost to the atmosphere.

3. Percent efficiency

Experimental food energy = 3800 J/g

Actual food energy = 150 Cal/28 g × 4184 J/1 Cal = 22 000 J/g

% Efficiency = Experimental value/Actual value × 100 %

= 3800/22 000 × 100 %

= 17 %

6 0

2 years ago

What is the primary force that helps suspension bridges use cables to hold their spans up?

BigorU [14]

Answer:

tension force

4 0

2 years ago

Read 2 more answers

It’s is the same one from my recent ones

UkoKoshka [18]

<h2>9. Given : P + O2 = P2O5</h2>

Balanced Chemical Equation: 4P + 5O2 = 2P2O5

Reactant Product

P = (1) 4 | P = (2) 4

O = (2) 10 | O = (5) 10

Reaction Information

Phosphorus + Dioxygen = Phosphorus Pentoxide

Reaction Type: Synthesis

<h2>10. Given: HCl + NaOH = NaCl + H2O </h2>

Reactant Product

H = 2 | H = 2

Cl = 1 | Cl = 1

Na = 1 | Na = 1

O = 1 | O = 1

<h3>Chemical Equation is already in balance.</h3>

Reaction Information: Hydrogen Chloride + Sodium Hydroxide = Sodium Chloride + Water

Reaction Type : Double Displacement (Acid-Base)

How to balance chemical equation?

brainly.com/question/15939935

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3 years ago

8. What behavior do all liquid or plastic solids near a heat source exhibit? L

LuckyWell [14K]

Answer:

Explanation:

One of the properties of a liquid is that, it's particles move freely (not tightly packed) hence the reason for it's free flowing (no definite shape) when shaken in a container, unlike a solid whose particles are tightly packed with restricted/no movement and hence the reason for it's compactness and it's definite shape.

When a plastic solid (whose particle is tightly packed and have a restricted movement/no movement) is placed near a heat source, it's particles gains energy in the process and starts to move (though slightly free) and become less tightly packed hence the reason it is observed that plastic solids near a heat source melts.

From the above, it can be deduced that a liquid and a plastic solid near a heat source have there particles move freely (and not tightly packed) hence making the two substances flow freely with no definite shape.

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3 years ago