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4 years ago

When you cut your knee what part of the blood helps the blood stop flowing?

Chemistry

2 answers:

raketka [301]4 years ago

7 0

Platelets

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IgorC [24]4 years ago

4 0

Answer:

the red blood cells

Explanation:

white blood cells fight off infection

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What is the relationship between the internal energy of a substance and its particle movement?

ss7ja [257]

Answer: The closeness, arrangement and motion of the particles in a substance change when it changes state. Materials are a store of internal energy , due to the motion of particles and the chemical bonds between them. When a substance is heated, its internal energy increases: the movement of its particles increases.

Explanation:

6 0

3 years ago

Animals need various nutrients in order to live and grow. Nitrogen, for example, is a nutrient that is needed to form molecules

Ad libitum [116K]

Answer:

It's A

Explanation:

Animals get the nitrogen they need by eating plants or other animals that contain nitrogen. When organisms die, their bodies decompose bringing the nitrogen into soil on land or into ocean water. Bacteria alter the nitrogen into a form that plants are able to use.

8 0

3 years ago

How many grams of ZnCl2 will be produced from 26.0g of Zn and 42.0g of HCl. Round to three significant figures

makvit [3.9K]

Answer: The mass of zinc chloride produced in the reaction is 54.1 grams

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

For zinc:

Given mass of zinc = 26 g

Molar mass of zinc = 65.4 g/mol

Putting values in equation 1, we get:

$\text{Moles of zinc}=\frac{26g}{65.4g/mol}=0.397mol$

For HCl:

Given mass of HCl = 42 g

Molar mass of HCl = 36.5 g/mol

Putting values in equation 1, we get:

$\text{Moles of HCl}=\frac{42g}{36.5g/mol}=1.150mol$

The chemical equation for the reaction of zinc and HCl follows:

$Zn+2HCl\rightarrow ZnCl_2+H_2$

By Stoichiometry of the reaction:

1 mole of zinc reacts with 2 moles of HCl

So, 0.397 moles of zinc will react with = $\frac{2}{1}\times 0.397=0.794mol$ of HCl

As, given amount of HCl is more than the required amount. So, it is considered as an excess reagent.

Thus, zinc metal is considered as a limiting reagent because it limits the formation of product.

By Stoichiometry of the reaction:

1 mole of zinc produces 1 mole of zinc chloride

So, 0.397 moles of zinc will produce = $\frac{1}{1}\times 0.397=0.397moles$ of zinc chloride

Now, calculating the mass of zinc chloride from equation 1, we get:

Molar mass of zinc chloride = 136.3 g/mol

Moles of zinc chloride = 0.397 moles

Putting values in equation 1, we get:

$0.397mol=\frac{\text{Mass of zinc chloride}}{136.3g/mol}\\\\\text{Mass of zinc chloride}=(0.397mol\times 136.3g/mol)=54.1g$

Hence, the mass of zinc chloride produced in the reaction is 54.1 grams

7 0

3 years ago

Why do you think the gesture and gaze features of the Ottonian manuscripts are so important? a. They demonstrate the emotion. b.

Llana [10]

Answer:A. They demonstrated emotions

Explanation: Ottonian manuscript are illuminated manuscripts,metal works which represented religious texts and believes. This art works were made in Germany during the Renaissance period lasting between the tenth and eleventh century. The Ottonian manuscripts and art works were produced by monks and nuns in the monasteries during those periods. The people of the Ottonian Kingdom loved mathematics and it was reflected in the art works which they produced during those times.

4 0

3 years ago

Read 2 more answers

Do all metals have more electrons than protons

Furkat [3]

Answer:

Explanation:

4 0

4 years ago