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3 years ago

How do you think petals protect the internal structures of a plant?

Chemistry

2 answers:

alina1380 [7]3 years ago

7 0

Answer:

hmm that is a very tricky question. probably from over flooding with water

VMariaS [17]3 years ago

6 0

The petals of the flowers grow and fall off to make new ones when you feed it so it can survive again .

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Is Solar energy a matter?

NikAS [45]

Answer:

Solar energy is a renewable free source of energy

Explanation:

It is sustainable and totally inexhaustible, unlike fossil fuels which are finite. It is also a non-polluting source of energy and it does not emit any greenhouse gases when producing electricity.

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2 years ago

Read 2 more answers

What is an example of land features formed from constructive forces?

elena-14-01-66 [18.8K]

It’s C.valley formed from water erosion

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3 years ago

Lead(II) chromate, PbCrO4, is a yellow paint pigment (called chrome yellow) prepared by a precipitation reaction. In a preparati

Roman55 [17]

Answer:

n = 0.1624 moles

Explanation:

$n=\frac{m}{M} \\n=\frac{52.5}{323.1937} \\n= 0.1624 mol$

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2 years ago

A cup of gold colored metal beads was measured to have a mass 425 grams. By water displacement, the volume of the beads was calc

Troyanec [42]

Given parameters;

Mass of gold colored metal beads = 425g

Volume of water displaced by beads = 48.0cm³

Unknown;

Identity of the metal = ?

Given densities;

Gold: 19.3 g/mL

Copper: 8.86 g/mL

Bronze: 9.87 g/mL

Density is an intensive property of any substance. This implies that we can use the density of any substance to identify it.

Density can be defined as the mass per unit volume of a substance. Every substance has a unique mass per volume.

Mathematically;

Density = $\frac{mass}{volume}$

where mass is in kg or g

volume is in m³ or cm³

To find the density, we must know the mass and volume.

In this problem, the volume of the gold metal beads is the same as the volume of water displaced. This is a way to measure volume of solids.

Since the volume is given in cm³, and we are comparing with choices that have units in g/mL, we simply convert the volume in cm³ to mL

1cm³ = 1mL³

So therefore, volume of gold colored metal is 48mL

Now input the parameters given and solve for the density;

Density = $\frac{425g}{48mL }$ = 8.85g/mL

From the given densities, we clearly see that copper is the metal since they both of similar densities.

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3 years ago

What is the pH when 10.0 mL of 0.20 M potassium hydroxide is added to 30.0 mL of 0.10 M cinnamic acid, HC9H7O2 (Ka = 3.6 × 10–5)

astra-53 [7]

Answer:-

Solution:- As is clear from the given Ka value, Cinnamic acid is a weak acid. let's calculate the moles of acid and KOH added to it from their given molarities and mL.

For KOH, $10.0mL(\frac{1L}{1000mL})(\frac{0.20mol}{1L})$

= 0.002 mol

For Cinnamic acid, $30.0mL(\frac{1L}{1000mL})(\frac{0.10mol}{1L})$

= 0.003 mol

Acid and base react as:

$HC_9H_7O_2(aq)+KOH(aq)\rightleftharpoons KC_9H_7O_2(aq)+H_2O(l)$

The reaction takes place in 1:1 mol ratio. Since the moles of acid are in excess, the acid is still remaining when all the kOH is used.

0.002 moles of KOH react with 0.002 moles of Cinnamic acid to form 0.002 moles of potassium cinnamate. Excess moles of Cinnamic acid = 0.003 - 0.002 = 0.001

As the solution have weak acid and it's salt(or we could say conjugate base), it is a buffer solution and the pH of the buffer solution could easily be calculated using Handerson equation:

$pH=pKa+log(\frac{base}{acid})$