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zepelin [54]
3 years ago
14

When performing physical exercise, the heart rate, by what percentage can it be increased?

Chemistry
2 answers:
Dafna11 [192]3 years ago
4 0

Answer:

10

Explanation:

I did that already. You got beo

Lina20 [59]3 years ago
3 0

Answer: 50% to 85% of the person’s maximum heart rate.

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)-<br>symbols<br>following elements<br>silver, Copper ,magnesium ,sulphur<br><br>​
NNADVOKAT [17]

Ag,Cu,Mg,S are the answers...............

3 0
3 years ago
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(CH3)2-CH-CH2-O(CH3)3IUPAC NAME
bazaltina [42]

Answer:

1-(tert-butoxy)-2-methylpropane

Note: there is a mistake in formula, the correct formula is (CH₃)₂-CH-CH₂-O-C(CH₃)₃ not (CH₃)₂-CH-CH₂-O(CH₃)₃, because oxygen is a divalent compound.

Explanation:

<em>Structural formula is attached</em>

IUPAC naming rules

1. start numbering the chain from the functional group. In this compound we        start from oxygen side.

2. Here we can see that at position 1 there is an oxy group along with a tertiary carbon having three methyl groups. So we write it as 1-tert-butoxy. Which means that there is a methoxy group at position 1 along with a tertiary carbon.

3. At position 2 we can see that there is a methyl group attached to the main chain, so we write it as 2-methyl.

4. Now we count the total number of carbons in the main chain. As we can see that there are 3 carbons in the remaining or parent chain, so we write it as propane

5. So the IUPAC name of the compound will be 1-(tert-butoxy)-2-methylpropane

3 0
4 years ago
Order earths layers from highest temperature to lowest temperature .
Andreyy89
Inner Core, Outer Core, Lower Mantle, Upper Mantle, Crust.
5 0
3 years ago
What are the most common symptoms of acid poisoning
arlik [135]

Answer:

When swallowed, the signs and symptoms may include:

Severe burning and associated pain in the mouth, throat, and food-pipe

Drooling from the mouth

Loss of vision; unable to speak

Inflammation of the throat may cause respiratory difficulties

Sudden reduction in blood pressure (hypotension)

Vomiting blood

On skin contact, the signs and symptoms may include:

Severe skin and tissue burns associated with pain

Severe eye burns associated with pain; loss of vision

When inhaled, the signs and symptoms may include:

Coughing (including coughing-up blood), choking

Heaviness in the chest; chest pain

Bluish discoloration of lips and beneath fingernails

Respiratory difficulties

Reduced blood pressure (hypotension)

Headache and weakness

Increased heart-rate

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Explanation:

6 0
3 years ago
Read 2 more answers
Aqueous sulfuric acid reacts with solid sodium hydroxide to produce aqueous sodium sulfate and liquid water. If 1.92 g of sodium
Oksana_A [137]

Answer:

The % yield is 27.0 %

Explanation:

<u>Step 1: </u>Data given

Mass of sulfuric acid = 4.9 grams

Mass of sodium hydroxide = 7.8 grams

Mass of sodium sulfate produced = 1.92 grams

Molar mass H2SO4 = 98.08 g/mol

Molar mass NaOH = 40 g/mol

Molar mass Na2SO4 = 142.04 g/mol

<u>Step 2: </u>The balanced equation

H2SO4 + 2NaOH → Na2SO4 + 2H2O

<u>Step 3</u>: Calculate moles H2SO4

Moles H2SO4 = Mass H2SO4 / Molar mass H2SO4

Moles H2SO4 = 4.9 grams / 98.08 g/mol =

Moles H2SO4 = 0.05 moles

<u>Step 4:</u> Calculate moles NaOH

Moles NaOH = 7.8 grams / 40 g/mol

Moles NaOH = 0.195 moles

<u>Step 5</u>: Calculate limiting reactant

For 1 mole H2SO4 consumed ,we need 2 moles NaOH to produce 1 mole Na2SO4 and 2 moles H2O

H2SO4 is the limiting reactant. It will completely be consumed (0.05 moles).

NaOH is in excess. There will react 2*0.05 = 0.1 moles

There will remain 0.195 -0.1 = 0.095 moles NaOH

<u>Step 6:</u> Calculate moles Na2SO4

For 1 mole H2SO4 consumed ,we need 2 moles NaOH to produce 1 mole Na2SO4

For 0.05 moles H2SO4, we have 0.05 moles Na2SO4

<u>Step 7:</u> Calculate mass of Na2SO4

Mass Na2SO4 = Moles Na2SO4 * Molar mass Na2SO4

Mass = 0.05 moles * 142.04 g/mol = 7.102

This is the theoretical yield

<u>Step 8:</u> Calculate the percent yield of Na2SO4

% yield = (actual yield / theoretical yield) * 100%

% yield = (1.92 /  7.102) *100% = 27.0 %

The % yield is 27.0 %

7 0
4 years ago
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