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3 years ago

Science question down below answer quickly

Chemistry

2 answers:

Liula [17]3 years ago

6 0

The answer is B biology

Brums [2.3K]3 years ago

4 0

Chemistry choice A is the answer but there is a chance it might be astronomy

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6 NaOH + 2 Al --> 2 Na3AlO3 + 3 H2 If you start with 258 g of Al, how many moles of Na3AlO3 can you make?

tatyana61 [14]

Solution :

Assuming all Al will be consumed in the reaction.

From the given equation, 2 mole of Al produce 2 mole of $Na_3AlO_3$ .

So, 1 mole of Al produce 1 mole of $Na_3AlO_3$ . .....statement 1)

Number of moles of Al in 258 gram of Al.

$n = \dfrac{mass}{molar\ mass}\\\\n = \dfrac{258}{27}\ moles\\\\n = 9.556 \ moles$

Therefore, from statement 1) number of moles of $Na_3AlO_3$ produced is also 9.556 moles.

7 0

3 years ago

Which are characteristics of natural selection? Select three options.

Luda [366]

Affects populations,
Occurs when there is genetic variation
Selects organisms with certain traits to survive.

5 0

3 years ago

John and his wife are celebrating their first wedding anniversary. Their dinner consists of 55 grams of carbohydrates, 36 grams

nika2105 [10]

Answer: 733 kcal

Explanation:

According to a system used to calculate the available energy of foods, we have the following data:

protein has 4 kcal/g
carbohydrates has 4 kcal/g
fat has 9 kcal/g
alcohol has 7 kcal/g

So, we are told Jhon and his wife's dinner has:

55 g of carbohydrates
36 g of protein
27 g of fat
18 g of

Now we have to multiply these values by the kilocalories:

(55 g of carbohydrates)(4 kcal/g)=220 kcal
(36 g of protein)(4 kcal/g)=144 kcal
(27 g of fat)(9 kcal/g)=243 kcal
(18 g of alcohol)(7 kcal/g)=126 kcal

Then we have to sum all, giving the following result:

4 0

4 years ago

How do you know if a compound is neutral?

belka [17]

When the overall charge is equal to zero

3 0

4 years ago

All of the following reactions can be described as displacement reactions except:____________.

Lady_Fox [76]

Answer:

Explanation:

The reaction that is not a displacement reaction from all the options is $C_6H_6_{(l)} + Cl_{2(g)} --> C_6H_5Cl_{(l)} + HCl_{(g)}$

In a displacement reaction, a part of one of the reactants is replaced by another reactant. In single displacement reactions, one of the reactants completely displaces and replaces part of another reactant. In double displacement reaction, cations and anions in the reactants switch partners to form products.

<em>Options a, c, d, and e involves the displacement of a part of one of the reactants by another reactant while option b does not.</em>

Correct option = b.

8 0

3 years ago