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zaharov [31]
2 years ago
14

28. The formula for magnesium nitride is____. a. MgN b. MgN3 c. Mg3N2 d. Mg2N3

Chemistry
2 answers:
oksian1 [2.3K]2 years ago
8 0

Answer:

C

Explanation:

As long as those numbers are subscripts then that's right

Greeley [361]2 years ago
7 0
Answer:
C. Mg3N2


Explanation:

Magnesium has a positive 2 charge and nitrogen has a negative 3 charge. To completely balance it out, you need three magnesium’s and two nitrogen’s. The final charge for magnesium would be positive 6 and the final charge for nitrogen would be negative 6, this will make it neutral.


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Proteins have two main secondary structures: _______, which are spirals formed by hydrogen bonds between amino acids, and ______
Musya8 [376]

Answer:

Explanation:

Proteins have two main secondary structures: alpha helices, which are spirals formed by hydrogen bonds between amino acids, and beta pleated sheets, [ which are formed by a bend in the amino acid with alternating hydrogen bonding between amino acids.

6 0
2 years ago
Energy from a reaction was determined to be 3870 J using a water calorimeter, when burning 9.00 grams of H­2. What is the total
Paraphin [41]

Answer:

860 J / mol

Explanation:

Enthalpy = Energy / no. of moles

no. of moles = mass / molar mass

Take the atomic mass of H = 1.0,

molar mass of H2 = 1.0 x 2

= 2.0

no. of moles of H2 = 9.00/2

= 4.5 mol

Hence,

Enthalpy = 3870 / 4.5

=860 J / mol

7 0
3 years ago
In a certain industrial process involving a heterogeneous catalyst, the volume of the catalyst (in the shape of a sphere) is 10.
trasher [3.6K]

Answer:

The second run will be faster - true, the increased surface area of catalyst will increase the rate of reaction

The second run will have the same rate as the first - possible, in case there is a factor other than catalyst limiting the reaction

The second run has twice the surface area - yes, 44 sqcm to 22 sqcm

Explanation:

A catalyst is a material which speeds up a reaction without being consumed in the process. A heterogeneous catalyst is one which is of a different phase than the reactants. The effectiveness of a catalyst is dependent on the available surface area. The first step for this question is to determine the total available surface area of catalyst in both processes.

Step 1: Determine radius of large sphere

V_{L}=\frac{4}{3}*pi*{r_{L}}^{3}

10=\frac{4}{3}*pi*{r_{L}}^{3}

{r_{L}}^{3}=\frac{7.5}{pi}

r_{L}=1.337cm

Step 2: Determine surface area of large sphere

A_{L}=4*pi*{r_{L}}^{2}

A_{L}=4*pi*1.337^{2}

A_{L}=22.463 cm^{2}

Step 3: Determine radius of small sphere

V_{s}=\frac{4}{3}*pi*{r_{s}}^{3}

1.25=\frac{4}{3}*pi*{r_{s}}^{3}

{r_{s}}^{3}=\frac{0.9375}{pi}

r_{s}=0.668cm

Step 4: Determine surface area of small sphere

A_{s}=4*pi*{r_{s}}^{2}

A_{s}=4*pi*0.668^{2}

A_{s}=5.607 cm^{2}

Step 5: Determine total surface area of 8 small spheres

A_{S}=8*A_{s}

A_{S}=8*5.607

A_{S}=44.856 cm^{2}

A_{L}=22.463 cm^{2} - Surface area of 1 large sphere

A_{S}=44.856 cm^{2} - Surface area of 8 small spheres

Options:

  1. The second run will be faster - true, the increased surface area of catalyst will increase the rate of reaction
  2. The second run will be slower - false, the increased surface area of catalyst will increase the rate of reaction
  3. The second run will have the same rate as the first - possible, in case there is a factor other than catalyst limiting the reaction
  4. The second run has twice the surface area - yes, 44 sqcm to 22 sqcm
  5. The second run has eight times the surface area - no, 44 sqcm to 22 sqcm
  6. The second run has 10 times the surface area - no, 44 sqcm to 22 sqcm
7 0
3 years ago
Read 2 more answers
Is waste water a pure subtance or a mixture
Alla [95]
The pure substance of water mixes with the waste. The waste does not dissolve into the water, therefore it is a mixture.

6 0
3 years ago
What happens in this circuit if one of the light bulbs burns out?
bulgar [2K]
4.The other light bulb will stay on and glow brightly.
4 0
2 years ago
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