When does the first step of digestion usually occur?

Chemistry

2 answers:

SVEN [57.7K]3 years ago

5 0

Answer:

when the food is chewed

Explanation:

first step is from your mouth when you chew the food

USPshnik [31]3 years ago

5 0

Answer:

when the food is chewed

Explanation:

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Which equation shows how to calculate how many grams (g) of Mg(OH)2 would be produced from 4mol KOH? The balanced reaction is:

Simora [160]

Answer:

4 mol of KOH would produce 116.6 g of Mg(OH)₂

Explanation:

According to the following balanced equation:

MgCl₂+ 2 KOH -----> Mg(OH)₂ + 2 KCL

One can note that 2 mol of KOH react with MgCl₂ to produce 1 mol of Mg(OH)₂.

using cross multiplication

2 mol of KOH → 1 mol of Mg(OH)₂.

4 mol of KOH → ?? mol of Mg(OH)₂.

no of moles of Mg(OH)₂ = (1 mol* 4 mol) / 2 mol =2 mol

Now we can convert moles of Mg(OH)₂ to grams using the formula

mass of Mg(OH)₂= (no. of moles * molar mass) = (2 mol * 58.3g/mol) = 116.6 g

So, 4 mol of KOH would produce 116.6 g of Mg(OH)₂.

6 0

4 years ago

What is the volume at stp of 720.0 ml of a gas collected at 20.0 °c and 3.00 atm pressure?

MArishka [77]

Combined gas law is
PV/T = K (constant)

P = Pressure
V = Volume
T = Temperature in Kelvin

For two situations, the combined gas law can be applied as,
P₁V₁ / T₁ = P₂V₂ / T₂

P₁ = 3.00 atm P₂ = standard pressure = 1 atm
V₁ = 720.0 mL T₂ = standard temperature = 273 K
T₁ = (273 + 20) K = 293 K

By substituting,
3.00 atm x 720.0 mL / 293 K = 1 atm x V₂ / 273 K
V₂ = 2012.6 mL

hence the volume of gas at stp is 2012.6 mL

5 0

3 years ago

!!!!!!!!!!! I will mark as brilliant

Vika [28.1K]

Answer:

All matter is made up of tiny particles called atoms. Atoms are made up of three subatomic particles known as proton, neutron and electron. Protons and neutrons are located in the nucleus.

The nucleus is dense and takes up very little space within the atom. All protons have a positive charge and have a mass of about 1 amu. All neutrons have no charge or are neutral and have a mass of about 1 amu.

Electrons are located in the area known as electron cloud. Electrons orbit around the nucleus and have a negative charge

4 0

3 years ago

A rigid sphere is falling from a height of 1m in a fluid of density 1000 m3/kg. The time it took to fall is 500 seconds. If the

Allisa [31]

Answer:

0.00191 meter is the diameter of the sphere.

Explanation:

Velocity of the rigid sphere = $v=\frac{1m}{500 s}$