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4 years ago

For METALS, REACTIVITY_______

Chemistry

1 answer:

Ray Of Light [21]4 years ago

3 0

Answer:

For metal reactivity increases as you go down a group, for nonmetal reactivity decreases as you go down a group.

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A balloon is filled with 2000 mL of air at a pressure of 2 atm. What is the volume of the balloon if the pressure is

artcher [175]

Answer:

800mL

Explanation:

Using Boyle's law which states that the volume of a given mass of gas is inversely proportional to the pressure, provided temperature remains constant

P1V1= P2V2

P1 = 2 atm, V1 = 2000mL ,

P2 = 5atm , V2 = ?

2 × 2000 = 5 × V2

Divide both sides by 5

V2 = 4000 ÷ 5

V2 = 800mL

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4 years ago

Hydrogen peroxide spontaneously decomposes to yeild water and oxygen. Balance this reaction.

gladu [14]

C: 4 H on the left and right, 4 O on both sides making it balanced

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4 years ago

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How many CaF are in a 1.7x10^25 please I need help fast!!

Gemiola [76]

<h3>Answer:</h3>

28 mol CaF

<h3>General Formulas and Concepts:</h3>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right<u> </u>

<u>Chemistry</u>

<u>Atomic Structure</u>

Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

<u>Stoichiometry</u>

Using Dimensional Analysis

<h3>Explanation:</h3>

<u>Step 1: Define</u>

[Given] 1.7 × 10²⁵ molecules CaF

[Solve] moles CaF

<u>Step 2: Identify Conversions</u>

Avogadro's Number

<u>Step 3: Convert</u>

[DA] Set up: $\displaystyle 1.7 \cdot 10^{25} \ molecules \ CaF(\frac{1 \ mol \ CaF}{6.022 \cdot 10^{23} \ molecules \ CaF})$
[DA] Multiply/Divide [Cancel out units]: $\displaystyle 28.2298 \ moles \ CaF$

<u>Step 4: Check</u>

<em>Follow sig fig rules and round. We are given 2 sig figs.</em>

28.2298 mol CaF ≈ 28 mol CaF

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3 years ago

When a match burns it's mass decreases. Is this a violation of the law of conservation of mass?

svetlana [45]

No. The mass is released into the air.

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4 years ago

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Question 2<br> How many significant figures does the number have?<br> 23.0702

Pavlova-9 [17]

The number 23.0702 has 6 significant figures.

To answer this, you must have the rules for significant figures,

1. All non-zero numbers ARE significant
2. Zeros between two non-zero digits ARE significant
3. Leading zeros are NOT significant
4. Trailing zeros are ONLY significant if the number has a decimal point

The number 23.0702 has 4 non-zero numbers(rule 1), and both zeros are between two non-zero digits(rule 2). Since all 6 figures in the number 23.0702 are significant, the number 23.0702 has 6 significant figures.

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4 years ago