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2 years ago

Is this right? giving brainlt if you actually checked

Chemistry

2 answers:

Viefleur [7K]2 years ago

7 0

Answer:

yes you got them all right

good job

Explanation:

Maksim231197 [3]2 years ago

5 0

Answer:

yes it is

Explanation:

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Approximately how many natural forming elements are there

mamaluj [8]

98 elements are naturally forming elements.

Answer: 98

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3 years ago

How does oxygen satisfy the octet rule? Mark all that apply.

GenaCL600 [577]

(D) It shares to electrons with another non metal. Take H2O for example. Oxygen has 6 valence electrons, Hydrogen has one. Each valence electron on hydrogen will share its electron with one of the two remaining unpaired electrons of Oxygen.

7 0

4 years ago

How does a tree speed up erosion? How can it slow erosion down?

GREYUIT [131]

A tree is able to speed up erosion because it break up rocks. This can happen as it’s roots grow through rocks, the water breaks through rocks, etc.
It can slow erosion down because it can act as a barrier to the elements that erode.

8 0

3 years ago

Calcium chloride (aq) reacts with sodium carbonate (aq) to from solid calcium carbonate and aqueous sodium chloride. Determine t

natulia [17]

Answer:

0.0488 L

Explanation:

Step 1:

The balanced equation for the reaction. This is given below:

CaCl2(aq) + Na2CO3(aq) —> CaCO3(s) + 2NaCl(aq)

Step 2:

Determination of the number of mole of Na2CO3 in 0.0650 L of 1.50 M Na2CO3 solution.

Volume of solution = 0.0650 L

Molarity of Na2CO3 = 1.50 M

Mole of solute (Na2CO3) =?

Molarity = mole of solute /Volume of solution

1.50 = mole of solute/0.0650

Cross multiply to express in linear form.

Mole of solute = 1.5 x 0.0650

Mole of solute (Na2CO3) = 0.0975 mole

Step 3:

Determination of the number of CaCl2 that reacted.

CaCl2(aq) + Na2CO3(aq) —> CaCO3(s) + 2NaCl(aq)

From the balanced equation,

1 mole of CaCl2 reacted with 1 mole Na2CO3.

Therefore, 0.0975 mole of CaCl2 will also react with 0.0975 mole of Na2CO3.

Step 4:

Determination of the volume of CaCl2 that reacted.

Mole of solute (CaCl2) = 0.0975 mole

Molarity of CaCl2 = 2.00 M

Volume of solution =?

Molarity = mole of solute /Volume

2 = 0.0975/volume

Cross multiply to express in linear form

2 x Volume = 0.0975

Divide both side by 2

Volume = 0.0975/2

Volume = 0.0488 L

Therefore, the volume of CaCl2 that is 0.0488 L

4 0

3 years ago

Read 2 more answers

1. Calculate the amount of heat required for 25.0 grams of water to

nikklg [1K]

Answer:

1. 2090 J

2. 113,000J

3. 33,900J

4. -209.2 J

5. 2g

Explanation:

Note: specific heat capacity of water is 4.184 J/g°C.

1. The amount of heat can be calculated using the formula:

Q = m × c × ∆T

Q = 25 × 4.184 × (30 - 10)

Q = 104.6 × 20

Q = 2092 J

Q = 2090 J (nearest tens)

2. This question can be solved using the latent heat of vaporization of water. The latent heat of vaporization of a substance is the amount of heat required to convert a unit gram of a liquid into vapor without a change in temperature. The latent heat of vaporization of water per gram is:

2257 J/g

For 50grams of water, amount of heat that will be required will be: 50 × 2260

= 113,000J

3. For 15g of water, the amount of heat will be 15 × 2260 (latent heat of vaporization)

= 33,900J

4. Q = m × c × ∆T

Q = 5 × 4.184 × (40 - 50)

Q = 20.92 × (-10)

Q = -209.2 J

5. Q = m × c × ∆T

84 = m × 4.184 × (35 - 25)

84 = m × 4.184 × 10

84 = 41.84m

m = 84/41.84

m = 2.0076

m = 2g

8 0

3 years ago

Is this right? giving brainlt if you actually checked​

Is this right? giving brainlt if you actually checked