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3 years ago

NEED HELP ON 31,32,33..ONLY IF YOU KNOW PLEASE

Chemistry

1 answer:

enyata [817]3 years ago

6 0

Answer:

31. C

32. D

33. B

Explanation:

31. A plant cell is an eukaryotic cell i.e. it contains a membrane-bound nucleus, located CENTRALLY. The nucleus is the largest organelle in the plant cell. The cell/plasma membrane bounds the cell while the chloroplast organelle (site of photosynthesis) is also located in the plant cell. Based on this description, the image in OPTION C is correct.

32. Pottasium (K) is a highly reactive group 1 element. As stated in this question, pottasium reacts vigorously with water (H2O). This reactive property of K element is due to its valence electrons. However, elements in the same group as pottasium i.e same column on the periodic table will have the same number of valence electrons, hence, will behave chemically similar. Therefore, elements in the same column as pottasium will react the same way with water.

33. A reactant is a an element/compound in a chemical reaction that gets used up to form new products. They are usually the starting materials located on the left side of any equation. In this equation shown as:

2CuO + C → 2Cu + CO2

CuO and C are the REACTANTS while Cu and CO2 are the products.

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What is the molarity of a sucrose solution containing 34.2 grams of sucrose in 500.0 mL of water? The molar mass of sucrose, C12

Alenkasestr [34]

0.2 M is the molarity of a sucrose solution containing 34.2 grams of sucrose in 500.0 ml of water.

Explanation:

Data given:

mass of sucrose = 34.2 grams

volume of water = 500 ml or 0.5 Litres

molar mass of sucrose = 342 grams/mole

molarity = ?

To calculate molarity first we will calculate number of moles provides,

number of moles = $\frac{mass}{ato,ic mass of 1 mole}$

putting the values in the equation:

number of moles = $\frac{34.2}{342}$

number of moles = 0.1 mole

now the molarity will be calculated by applying the following formula:

molarity = $\frac{number of moles}{volume in litres}$

putting the values in the equation:0.2 m

molarity = $\frac{0.1 }{0.5}$

molarity = 0.2 M

thus the molarity of sucrose solution of 500 ml is 0.2 M

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3 years ago

Which of these organelles produces h2o2 as a by-product?

Gala2k [10]

The parts constituting a single cell are called its organelles. Examples are ribosomes, mitochondria, endoplasmic reticulum, Golgi bodies and many more. You might confuse the answer to this question because there is an organelle named Peroxisome. It is called such because it synthesizes Hydrogen Peroxide or H₂O₂. It breaks the compound into its individual components, water and oxygen. So, it uses up H₂O₂, not produce it. The organelle that actually produces H₂O₂ as a by-product is the mitochondria through the process of respiration.

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3 years ago

Study Example 8.1 on page 321. Then, calculate the molarity of a solution made by adding 5.51 g of CaCl2 to enough water to crea

DiKsa [7]

Answer:

0.0198 M

Explanation:

Given data

Mass of CaCl₂ (solute): 5.51 g

Volume of solution: 2.50 L

Step 1: Calculate the moles of solute

The <em>molar mass of CaCl₂</em> is 110.98 g/mol. The moles corresponding to 5.51 g are:

5.51 g × (1 mol/110.98 g) = 0.0496 mol

Step 2: Calculate the molarity of the solution

<em>M = moles of solute / liters of solution</em>

M = 0.0496 mol / 2.50 L

M = 0.0198 M

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4 years ago

This element is named after the upper penisula?

Natasha_Volkova [10]

There is a place in Upper Peninsula that is named Iron or Iron Mountain.

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3 years ago

Hydroelectricity and tidal energy are similar because

vovikov84 [41]

C. both sources of energy rely on water.

Explanation:

Hydroelectricity and tidal energy are similar energy sources because they both rely on water.

They harness the power of moving water to produce their energy.

Tidal energy is the energy derived from moving water as crashing waves in an ocean.
Hydroelectricity is produce when water from a dam channel is used to drive heavy turbines.
They are both renewable energy sources.

learn more:

Non-renewable resources brainly.com/question/2948717

#learnwithBrainly

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3 years ago