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4 years ago

True or False: Bacteria are living organisms because they use energy,grow, and respond to their surroundings

2 answers:

7 0

True, bacteria (singular: bacterium) are a major group of living organisms. Most are microscopic and unicellular, with a relatively simple cell structure lacking a cell nucleus, and organelles such as mitochondria and chloroplasts.Bacteria are the most abundant of all organisms

Mandarinka [93]4 years ago

6 0

True. it is true true true true true true

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In this lab, you will do experiments to identify types of changes. Using the question format you learned (shown above), write an

hodyreva [135]

Answer:

a physical change does not change the composition (what it's made of) as a chemical change would.

3 0

3 years ago

Rearrange the following equation and solve for x when the hydrogen ion concentration is 0.01 M. pH=4+logx (Recall that pH=−log[H

bezimeni [28]

Answer:

x = 1 x 10⁻²

Explanation:

Since the pH is the same in both cases, the two expressions for pH can be set equal to each other:

pH = 4 + log(x) = -log[H⁺]

The hydrogen ion concentration ([H⁺]) is 0.01 M, so this value can be substituted in the equation:

4 + log(x) = -log(0.01)

4 + log(x) = 2

log(x) = -2

x = 10⁻²

5 0

3 years ago

Write the balanced chemical equation for each of these reactions. Include phases.

Ket [755]

Answer: The chemical equations are given below.

Explanation:

For 1:

The chemical equation for the reaction of lead nitrate and sodium hydroxide follows:

$Pb(NO_3)_2(aq.)+2NaOH(aq.)\rightarrow Pb(OH)_2(s)+2NaNO_3(aq.)$

By Stoichiometry of the reaction:

1 mole of aqueous solution of lead nitrate reacts with 2 moles of aqueous solution of sodium hydroxide to produce 1 mole of solid lead hydroxide and 2 moles of aqueous solution of sodium nitrate.

For 2:

The chemical equation for the reaction of lead hydroxide and hydroxide ions follows:

$Pb(OH)_2(s)+2OH^-(aq.)\rightarrow [Pb(OH)_4]^{2-}(aq.)$

By Stoichiometry of the reaction:

1 mole of lead hydroxide reacts with 2 moles of aqueous solution of hydroxide ions to produce 1 mole of aqueous solution of tetra hydroxy lead (II) complex

Hence, the chemical equations are given above.

4 0

3 years ago

The setup in the diagram is left outside during the day and night . Bubbles are continuously produced regardless of the presence

Angelina_Jolie [31]

Answer:

Explanation:

6 0

3 years ago

Lactic acid, C3H6O3, is a monoprotic acid that is available in solid form. Determine the concentration of an unknown solution of

Andreas93 [3]

Answer:

0.497 moles/L

Explanation:

The reaction that takes place is:

C₃H₆O₃ + NaOH → C₃H₅ONa + H₂O

First we calculate the moles of lactic acid in 0,821 g, using its molar mass:

0,821 g ÷ 90 g/mol = 9,122x10⁻³mol lactic acid

One mole of lactic acid reacts with one mole of sodium hydroxide (it is a monoprotic acid), so in 18,34 mL of NaOH solution there are 9,122x10⁻³moles of NaOH:

18.34 mL ÷ 1000 = 0,01834 L

9,122x10⁻³mol ÷ 0,01834 L = 0.497 moles/L

8 0

4 years ago