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Ray Of Light [21]
3 years ago
11

⚠️FAST PLEASE⚠️IM TIMED HURRY⚠️

Chemistry
2 answers:
Sergeeva-Olga [200]3 years ago
7 0

Answer:

Living things can only come from living things.

Cells come from pre-existing cells.

Explanation:

inysia [295]3 years ago
4 0
Bruh the answer is e
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Suppose you have a bucket of sand containing 2.5 billion grains of sand (2.5 x 10 grains). Most of the grains of sand are white,
anzhelika [568]

Answer:

a. 5.0 x 10⁷ brown grains = 50 million

b. 5.0 x 10³ brown grains = 5000

Explanation:

The concentration of 2 % brown sand means we have for every 100 grains of sand 2 are brown.

We need to calculate the number of brown sand in the bucket as follows:

= 2.5 x 10⁹  billion grains of sand x  (2 brown grains/ 100 grains of sand)

= 5.0 x 10⁷ brown grains

Likewise if the concentration of brown sand is 2.0 ppm, it mean that we have 2 brown grain per every million grains of sand.

= 2.5 x 10⁹ billion grains of sand x ( 2.0 brown grains/10⁶ grains of sand )

= 5.0 x 10³ brown grains

The answers make sense since a concentration of 1 part per million is ten thousandths of  a 1 percent

3 0
4 years ago
What is the sum of the coefficients when the equation is balanced with the smallest whole numbers? __BaCl2 + __Fe2(SO4)3 → __FeC
aliina [53]

Explanation:

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8 0
3 years ago
During which step in the pcr cycle do primers form bonds with a single-stranded template?.
shutvik [7]
Answer: The first steps

Explanation: science
5 0
3 years ago
The equation for the formation of ammonia from nitrogen and hydrogen is shown below. What is the formula for the equilibrium con
WINSTONCH [101]

First, make sure to balance your equation.

3H2(g) + N2(g) ⇄ 2NH3(g)

Now, you can write your Kc expression. Remember that Kc is products over reactants, and the exponent for each product or reactant is based on its coefficient.

Kc = [NH3]^2 / [H2]^3[N2]

5 0
3 years ago
What is the base ionization constant expression for ammonia?
4vir4ik [10]

Explanation:

Kb: The base ionization constant

2) Ammonia (formula = NH3) is the most common weak base example used by instructors. ... This constant, Kb, is called the base ionization constant. It can be determined by experiment and each base has its own unique value. For example, ammonia's value is 1.77 x 10¯5.

7 0
3 years ago
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