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Monica [59]
2 years ago
5

The pressure needed to pump blood back to the heart is produced by the _____.

Chemistry
1 answer:
PolarNik [594]2 years ago
4 0

Answer:

A. body muscles

The pressure needed to pump blood back to the heart is produced by the <u>body </u><u>muscles </u><u>.</u>

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Please help me l don’t understand please !!!!!!
garik1379 [7]

Answer: C

Explanation:

he never had evidence in the first place that was nearly enough.

7 0
3 years ago
Chemical weathering processes do not alter the chemical structure of minerals in rocks. *
Anna007 [38]
I THINK that that is true. It's just weathering the rock down not change composition. Lemme know if you get it right please! (:
4 0
3 years ago
How many moles of O₂ are needed to react completely with 35.0 mol of FeCl₃? *
galben [10]

Answer:

52.5 mol O2

Explanation:

4 FeCl3 + 6 O2 -> 2 Fe2O3 +6 Cl2

4 mol FeCl3      -> 6 mol O2

35.0 mol FeCl3 -> x

x= (35.0 mol FeCl3 * 6 mol O2)/4 mol FeCl3

x=52.5 mol O2

5 0
3 years ago
Read 2 more answers
Which of the following is not a mixture?
MakcuM [25]

Answer:

Sugar

Explanation:

Mixtures are substances that made of two or more elements or other substances that are joined together by physical methods and when mixed can be also be separated by physical method into the original individual elements.

Air is a mixture of gases such as oxygen, nitrogen, carbon dioxide and rare gases. When an amount of air is collected, its constituents can be collected separately.

Likewise 7 up and sea water

Sugar is a compound made of carbon, hydrogen and oxygen, when sugar is decomposed, it's original constituents are not recovered but sugar is decomposed into carbon dioxide and water

4 0
3 years ago
When lithium nitride, Li3N(s) , is treated with water, H2O(l) , ammonia, NH3(g) , is produced. Predict the formula of the gas pr
Ronch [10]

<u>Answer:</u> The gas produced when sodium phosphide reacts with water is phosphine.

<u>Explanation:</u>

When sodium phosphide reacts with water molecule, it leads to the production of flammable, poisonous gas known as phosphine along with the production of sodium hydroxide.

The chemical reaction for the reaction of sodium phosphide with water follows the equation:

Na_3P(aq.)+3H_2O(l)\rightarrow PH_3(g)+3NaOH(aq.)

By Stoichiometry of the reaction:

1 mole of sodium phosphide reacts with 3 moles of water to produce 1 mole of phosphine gas and 3 moles of sodium hydroxide.

Hence, the gas produced when sodium phosphide reacts with water is phosphine.

7 0
3 years ago
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