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qwelly [4]
4 years ago
8

A plant uses the energy from sunlight to create oxygen and glucose from carbon dioxide and water. Which statement is true about

the changes that have occurred? A chemical change has occurred because energy was needed.
A physical change has occurred because the substances are still gases.

A physical change has occurred because the plant looks different.

A chemical change has occurred because new compounds have been produced.
Chemistry
2 answers:
Radda [10]4 years ago
7 0

A chemical change has occurred because new compounds have been produced.

dmitriy555 [2]4 years ago
3 0
<span>A chemical change has occurred because new compounds have been produced.</span>
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De que factores dependen la constante de equilibrio ​
8_murik_8 [283]

Answer:

La constante de equilibrio (K) se expresa como la relación entre las concentraciones molares (mol/l) de reactivos y productos. Su valor en una reacción química depende de la temperatura, por lo que ésta siempre debe especificarse.

Explanation:

4 0
3 years ago
If an object has a density of 25 g/cm and a mass of 100 grams, what is its volume? O 40 cm3 0.25 cm 4 cm3 125 cm3​
xz_007 [3.2K]
<h3>Answer:</h3>

4 cm³

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

<u>Math</u>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

Equality Properties

  • Multiplication Property of Equality
  • Division Property of Equality
  • Addition Property of Equality
  • Subtract Property of Equality

<u>Chemistry</u>

<u>Gas Laws</u>

Density = Mass over Volume

  • D = m/V
<h3>Explanation:</h3>

<u>Step 1: Define</u>

D = 25 g/cm³

m = 100 g

<u>Step 2: Solve for </u><em><u>V</u></em>

  1. Substitute variables [D]:                    \displaystyle 25 \ g/cm^3 = \frac{100 \ g}{V}
  2. Multiply <em>V</em> on both sides:                  \displaystyle V(25 g/cm^3) = 100 \ g
  3. Isolate <em>V</em>:                                            \displaystyle V = 4 \ cm^3
8 0
3 years ago
What tools would you use to measure the density of a rectangular block?
dimulka [17.4K]
A scale and a ruler. The scale to measure the mass, and a ruler to measure the volume.
3 0
3 years ago
This balanced chemical equation represents a chemical reaction: 6no + 4nh3 → 5n2 + 6h2o what volume of nh3 gas, at standard temp
Liula [17]

The answer is: volume of ammonia gas is 7.4 L.

Chemical reaction: 6NO + 4NH₃ → 5N₂ + 6H₂O.

m(NO) = 15 g; mass of nitrogen(II) oxide.

M(NO) = 30 g/mol; molar mass of nitrogen(II) oxide.

V(NH₃) = ?

n(NO) = 15 g ÷ 30 g/mol.

n(NO) = 0.5 mol; amount of nitrogen(II) oxide.

From chemical reaction: n(NO) : n(NH₃) = 6 : 4.

0.5 mol : n(NH₃) = 6 : 4.

n(NH₃) = 0.33 mol; amount of ammonia.

Vm = 22.4 L/mol; molar volume at STP.

V(NH₃) = 0.33 mol · 22.4 L/mol..

V(NH₃) = 7.4 L.

3 0
4 years ago
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How many orbitals are in the 5th energy level?
Alexandra [31]

Answer:7

Explanation:

8 0
3 years ago
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