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2 years ago

Why are lanthanides and actinides at the bottom of the periodic table

Chemistry

1 answer:

Gemiola [76]2 years ago

7 0

Write in your own words:

"The reason why Lanthanides and Actinides are located at the bottom of the periodical table is because of their properties and in the block in which electrons fill up. The lanthanides include elements 58 to 71 (fill out the 4f subshell) and the actinides include elements 89 to 103 (fill out the 5f subshell)."

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A basketball weighs approximately 1.35 kg. What is this mass in grams (g)? step by step

umka21 [38]

Answer:

1350 g

Explanation: just add a 0

5 0

4 years ago

An enzyme is discovered that catalyzes the chemical reaction:SAD -------->HAPPY

jekas [21]

Answer: Km = 10μM

Explanation: Michaelis-Menten constant (Km) measures the affinity a enzyme has to its substrate, so it can be known how well an enzyme is suited to the substrate being used. To determine Km another value associated to an eznyme is important: Turnover number (Kcat), which is the number of time an enzyme site converts substrate into product per unit time.

Enzyme veolcity is calculated as:

$V_{0} = \frac{E_{t}.K_{cat}.[substrate]}{K_{m}+[substrate]}$

where Et is concentration of enzyme catalitic sites and has to have the same unit as velocity of enzyme, so Et = 20nM = 0.02μM;

To calculate Km:

$V_{0}*K_{m} + V_{0}*[substrate] = E_{t}.K_{cat}.[substrate]$

$K_{m} = \frac{E_{t}.K_{cat}.[substrate]-V_{0}*[substrate]}{V_{0}}$

$K_{m} = \frac{0.02*600*40-9.6*40}{9.6}$

Km = 10μM

The Michaelis-Menten for the substrate SAD is 10μM.

3 0

3 years ago

Can someone please explain to me the metallic bond?

Arlecino [84]

Metallic bond is the electrostatic attraction between a positive ion and delocalised(free)electrons

6 0

4 years ago

The respiration rate of a goldfish is measured. The goldfish is then placed in cold water and the respiration rate is measured a

Ivenika [448]

Answer:

Temperature of the water

Explanation:

In every study, there must be independent and dependent variables. An independent variable is the variable that is changed in order to obtain a response. In this case, the temperature of the water is being changed, the response in this experiment is the respiration rate of the goldfish.

Thus the respiration rate of the goldfish is the dependent variable because it is controlled by the temperature of the water and changes accordingly.

Summarily, the independent variable is the temperature of the water while the dependent variable is the respiration rate of the goldfish.

4 0

3 years ago

A length of 10 cm equals how many dm? Mark all that apply.

kkurt [141]

Answer:

1 dm

Explanation:

Centimeter and decimeter both are units of length.

Centimeter is represented as "cm" while decimeter is represented as "dm"

centimeter is larger than decimeter. One centimeter have 10 decimeter.

1 cm = 10 dm

So in order to convert cm to dm we will divide the given value by 10.

10 dm × 1 cm/10 cm

1 dm

6 0

3 years ago