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3 years ago

Help Please!!!!!!!!!!!!!!!!!!!!!!

Chemistry

2 answers:

RUDIKE [14]3 years ago

7 0

Answer:

Explanation:

dmitriy555 [2]3 years ago

7 0

The answer is b

A. Is wrong because everyone has different dna because of genetics

B.is right because genes are from your parents or anyone who’s blood (I guess you could say)

C. Is wrong because I think it controls both or just the phenotype

And d is just dumb

Hope this helps you!!

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How many moles of a gas would occupy 22.4 Liters at 273 K and 1 atm?<br><br><br> Read bottom comment

Genrish500 [490]

Answer:

The following relationship makes this possible: 1 mole of any gas at standard temperature and pressure (273 K and 1 atm) occupies a volume of 22.4 L.

Explanation:

4 0

3 years ago

How many atoms of cobalt are in 4 moles of cobalt?

Anna [14]

<h3>Answer:</h3>

2 × 10²⁴ atoms Co

<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>

Reading a Periodic Table
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>

4 mol Co (Cobalt)

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

Avogadro's Number

<u>Step 3: Convert</u>

Set up: $\displaystyle 4 \ mol \ Co(\frac{6.022 \cdot 10^{23} \ atoms \ Co}{1 \ mol \ Co})$
Multiply/Divide: $\displaystyle 2.4088 \cdot 10^{24} \ atoms \ Co$

<u>Step 4: Check</u>

<em>Follow sig fig rules and round. We are given 1 sig fig.</em>

2.4088 × 10²⁴ atoms Co ≈ 2 × 10²⁴ atoms Co

4 0

2 years ago

A first-order decomposition reaction has a rate constant of 0.00440 yr−1. How long does it take for [reactant] to reach 12.5% of

mina [271]

Answer:

473 year

Explanation:

Using integrated rate law for first order kinetics as:

$[A_t]=[A_0]e^{-kt}$

Where,

$[A_t]$ is the concentration at time t

$[A_0]$ is the initial concentration

Given:

To reach 12.5% of reactant means that 0.125 of $[A_0]$ is decomposed. So,

$\frac {[A_t]}{[A_0]}$ = 0.125

t = ?

$\frac {[A_t]}{[A_0]}=e^{-k\times t}$

$0.125=e^{-0.00440\times t}$

t = 473 year

8 0

3 years ago

Which one of the following describe chemical properties? check all that apply. -water freezes at 0 degrees C. -sugar burns in ai

uysha [10]

I think the correct answer from the choices listed above is option C. The process that describes a chemical property of a substance is that when <span>sugar burns in air to form water and carbon. Hope this answers the question. Have a nice day.</span>

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3 years ago

Atom is anything that has mass and occupies space. True or false

rosijanka [135]

Answer:

False.

Explanation:

Matter is anything that has mass and occupies space, not atoms.

4 0

3 years ago