CHEMISTRY MIDDLE SCHOOL

Due to food scarcity in ancient times people had to spend

Answers

Answer 1

Answer: The answer is A as they had to spend time growing or looking for food as food was scarce back then.

Answer 2

Answer:

Answer:

growing food and selling items

Explanation:

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How many moles of sf6 are there in 459500000000000000 molecules of sf6

Answers

Answer : The number of moles of $SF_6$ is, $7.63* 10^(-7)$ moles.

Solution :

As we know that,

1 mole contains $6.022* 10^(23)$ number of molecules

As, $6.022* 10^(23)$ number of molecules of $SF_6$ are present in 1 mole of $SF_6$

So, $4595* 10^(14)$ number of molecules of $SF_6$ are present in $(4595* 10^(14))/(6.022* 10^(23))=7.63* 10^(-7)$ moles of $SF_6$

Therefore, the number of moles of $SF_6$ is, $7.63* 10^(-7)$ moles.

Think about your house, condo or apartment. What part of your home would be like the mitochondria of the cell? Why?reproduction all living things need cells

Answers

in our cell, mithocondria provide the energy required for the cells to do their daily actiivities.If it's compared to the parts in our home, i think it would be the electric box. The electric box acted as a source of power for the house to run its TV, Lamp, heater, basically almost everything Hope this helps. Let me know if you need additional help!

Tamara pours hot tea into a cold mug. A few moments later, she picks up the mug, and it is now warm.What is the main form of energy transfer involved in heating the mug?

Answers

Answer: Conduction

Explanation: MODES OF HEAT TRANSFER

Conduction: This type of heat transfer happens when there is direct contact between the two object.

Convection: This type of heat transfer happens when there is a movement of fluid (liquid or gas).

Radiation: This type of heat transfer happens when there is direct transfer of energy through space.

Thus as there is direct contact between the mug and the tea, the heat transfer occurs through conduction.

Conduction. Conduction is the transfer of heat through touch. The hot tea gave some heat to the cold mug by touching the mug, therefore it is conduction.

Check all items common to bases.minerals
metal
gas
H+
OH-
nitrogen

Answers

OH- is common to bases.

Explanation:

The base is a is an ionic compounds which when placed in aqueous solution dissociates in to a cation and an anion OH-.

The presence of OH- in the solution shows that the solution is basic or alkaline.

From Bronsted and Lowry concept base is a molecule that accepts a proton for example in NaOH, Na is a proton donor and OH is the proton acceptor.

A base accepts hydrogen ion and the concentration of OH is always higher in base.

There is a presence of conjugate acid and conjugate base in the Bronsted and Lowry acid and base.

Conjugate acid is one which is formed when a base gained a proton.

Conjugate base is one which is formed when an acid looses a proton.

And from the Arrhenius base Theory, the base is one that dissociates in to water as OH-.

Answer:

metal and OH-

Explanation:

Fill in the blanks rigids have ..... volume and.....

Answers

Jojo is this really u

A compound contains 70.18 % oxygen by mass. What mass of this compound would be needed to obtain 48.45 grams of oxygen?

Answers

Answer:

69.036 g of Compound is required to obtain 48.45 g of Oxygen.

Explanation:

Let us assume that the total mass of the compound is 100 g. So it means that this compound weighing 100 is composed 70.18 % of Oxygen or among 100 g of this compound 70.18 g is constituted by oxygen only. Hence, we can make a relation as that,

70.18 g O is present in = 100 g of a Compound

So,

48.45 g of O will be present in = X g of a Compound

Solving for X,

X = 100 g × 48.45 g ÷ 70.18 g

X = 69.036 g of Compound

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