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balu736 [363]
2 years ago
13

The type of research in which one variable is changed to see its effect is:

Chemistry
1 answer:
Sauron [17]2 years ago
5 0
An experiment because you need to change variables to get different outcomes and that is in an experiment
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B. Describe hydrogen bonding. (1 point)
marishachu [46]
Hydrogen bonding is an attractive force between a hydrogen atom attached to a electronegative element
6 0
1 year ago
In the absence of other information, you can predict that an organic molecule with the empirical formula of c12h24o12 is a_____.
Rzqust [24]

The empirical formula of c12h24o12 is a carbohydrate.

<h3>Carbohydrate</h3>

A carbohydrate is a biomolecule made up of carbon (C), hydrogen (H), and oxygen (O) atoms, often with a hydrogen-oxygen atom ratio of 2:1 (as in water), and so having the empirical formula Cm(H2O)n (where m may or may not be different from n). All molecules that meet this exact stoichiometric criterion are not, however, automatically categorized as being carbohydrates.

The term is most frequently used in biochemistry, where it is used as a synonym for saccharide, a class of compounds that includes sugars, starches, and cellulose. The four chemical categories of saccharides are monosaccharides, disaccharides, oligosaccharides, and polysaccharides. The smallest carbohydrates, monosaccharides and disaccharides, are sometimes referred to as sugars.

Learn more about carbohydrate here:

brainly.com/question/14614055

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5 0
2 years ago
Which has a smaller atomic radius: antimony (Sb) or bismuth (Bi)?
son4ous [18]
Bi

The nitrogen family includes the following compounds: nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi).
7 0
3 years ago
Read 2 more answers
The formation of nitryl fluoride, 2no2(g)+f2(g)⇌2no2f(g) is first order in no2 and first order in f2. if the concentration of no
ra1l [238]
The reaction is:

2 NO₂ (g) + F₂ (g) ⇆  2 NO₂F (g)

The stoichiometric coefficients of the substances balance out each other to obey the Law of Definite Proportions. Now, you have to note that determining the reaction rate expression is specific to a certain type of reaction. So, this are determined empirically through doing experiments. But in chemical reaction engineering, to make things simple, you assume that the reaction is elementary. This means that the order of a reaction with respect to a certain substance follows their individual stoichiometric coefficients. What I'm saying is, the stoichiometric coefficients are the basis of our reaction rate orders. For this reaction, the rate order is 2 for NO₂, 1 for F₂ and 2 for NO₂F. When the forward and reverse reactions are in equilibrium, then it applies that:

Reaction rate of disappearance of reactants = Reaction rate of formation of products.

Therefore, we can have two reaction rate constants for this. But since the conditions manipulated are the reactant side, let's find the expression for reaction rate of disappearance of reactants.

-r = k[NO₂]²[F₂]

The negative sign before r signifies the rate of disappearance. If it were in terms of the product, that would have been positive. The term k denotes for the reaction rate constant. That is also empirical. As you can notice the stoichiometric coefficients are exponents of the concentrations of the reactants. Let's say initially, there are 1 M of NO₂ and 1 M of F₂. Then,

-r = k(1)²(1)
-r = k

Now, if we change 1 M of NO₂ by increasing it to its half, it would now be 1.5 M NO₂. Then, if we quadruple the concentration of F₂, that would be 4 M F₂. Substituting the values:

-r = k(1.5)²(4)
-r = 9k

So, as you can see the reaction rate increase by a factor of 9.
4 0
3 years ago
How many molecules (or formula units) are in each sample? 74.41 g ( CCl4 )
Alexus [3.1K]
Molar mass CCl₄ = 12 + 35.5 x 4 = 154 g/mol

number of moles:

74.41 / 154 => 0.48318 moles 

1 mole ------------------- 6.02 x 10²³ molecules
0.48318 moles ----------- ?

molecules = 0.48318 x ( 6.02x10²³) / 1

molecules = 2.908 x 10²³ / 1

= 2.908 x 10²³ molecules

hope this helps!
3 0
3 years ago
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