Can someone please help me?? :(

Answer:

the correct answer false

Explanation:

Answer:

circulation

Explanation:

The movement of the blood through the heart and around the body through the narrow vessels is called circulation which makes up the cardiovascular system.

Answer:

Circulation

Explanation

digestion is the process of breaking down food by mechanical and enzymatic action in the alimentary canal into substances that can be used by the body and its the only one that makes sence

Answer:

To investigate the effect of changing the conditions on the rate of a reaction.

Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g

The volume of hydrogen gas produced can be measured using a gas syringe.

Method:-

- Support a gas syringe with a stand, boss and clamp.

- Using a measuring cylinder, add 50 cm3 of dilute hydrochloric acid to a conical flask.

- Add a 3 cm piece of magnesium ribbon to the flask. Immediately connect the gas syringe and start a stop clock.

- Record the volume of gas produced every 5 seconds. Continue timing until no more gas is given off.

- When the reaction is complete, clean the apparatus as directed by your teacher.

- Repeat steps 1 to 5 with different concentrations of hydrochloric acid.

I hope my answer helps you.

Answer:

89.6 liters

Explanation:

A STP (standard temperature and pressure) ONE mole of any idea gas will occupies 22.4 liters. So,...

4 moles x 22.4 L/mol = 89.6 liters

8.96 L is the answer

The substance Z will be a poison if it produces adverse effects on th body even in small quantities.

A poison is a substance which when ingested into the body of an organism causes harm or injury to that organism.

Poisons can be in gaseous, solid or liquid form.

Poisons may be natural or synthetic in nature.

The characteristics of poison include:

Therefore, the substance Z will be a poison if it produces adverse effects on th body even in small quantities.

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Answer:

5.55moles

Explanation:

[tex]2moles \: of \: aluminium = 3 \: moles \: of \: h2 \\ 3.7moles \: aluminium = x \\ 2x = 3.7 \times 3 \\ 2x = 11.1 \\ x = \frac{11.1}{2 } \\ x = 5.55moles[/tex]

Answer: 0.130 L

Explanation:

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Answer:

In some cases, changes in land use may have positive effects, such as increasing habitat (as a result of deliberate habitat restoration measures) and reclamation of previously contaminated lands for urban/suburban development.

Explanation:

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Based on the fact that only herbicide was used to grow the corn, this means that the resistance type of the corn are caterpillars.

Herbicide are chemicals used to control and kill weeds that could hinder crop production while insecticides are chemicals used to control insect pests.

According to this question, a field of corn was grown with 250 L/ha herbicide and no insecticide. This means that only herbs or weeds are being controlled on the field.

Therefore, it can be said that the corn plants are the type that are resistant to caterpillars, which are examples of insects.

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In the video "Are Wormholes The Answer To Time Travel?"Wormholes have been described as hypothetical space-time tunnels or bridges connecting two different locations in space-time allowing faster-than-light travel or perhaps time travel.

Investigating the question of whether wormholes can be used for time travel is "Are wormholes the answer to time travel?" The film explains that wormholes are hypothetical constructs that can join two different points in space-time, allowing travel faster than the speed of light and even time travel.

The video discusses the characteristics of wormholes, including their size, shape, and possible existence. In the film, several ideas and models, such as Einstein's theory of general relativity and the idea of ​​negative energy, have been put forward by physicists and other scientists to explain the potential of wormholes.

Therefore, in the video "Are Wormholes The Answer To Time Travel?"Wormholes have been described as hypothetical space-time tunnels or bridges connecting two different locations in space-time allowing faster-than-light travel or perhaps time travel.

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Answer:

It's b

Explanation:

For an adjustment of the alkalinity from 70 ppm to 100 ppm in a 250,000 gallon pool using sodium bicarbonate, the amount of added chemical  is mathematically given as

X=105lbs

Generally, the equation for the Chemical added  is mathematically given as

X=requred usage*desired change/10ppm*pool of gallon/10000

Therefore

X=1.4*(100-70/10)*(250000/10000

X=105lbs

In conclusion, the added chemical

X=105lbs

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Answer:

Increasing the H+/H3O+ will decrease the pH, while increasing the OH- ions will increase the pH

Explanation:

so pH=-log(H), which means that the smaller H gets to 0, the more the pH rises. The larger the H+ gets, the smaller the pH
if H is 1, then pH is 0
if H is 0.1, then pH is 1
if H is 0.01, then pH is 2
and so on
if H is 0.00000000000001, then the pH is 14
When OH goes up, H goes down, so
if OH is 0.00000000000001, then the ph is 0
if OH is 0.0000000000001, then the pH is 1
and so on
If the OH is 1, then the pH is 14

In the important industrial process for producing ammonia (the Haber Process), the overall reaction is:

N2(g) + 3H2(g) → 2NH3(g) + 100.4 kJ

A yield of NH3 of approximately 98% can be obtained at 200°C and 1,000 atmospheres of pressure.

This reaction is: Endothermic

The volume of a gas that occupies 9 L at a temperature of 325K is 12.46L.

The volume of a given gas can be calculated using the following Charle's law equation:

V1/T1 = V2/T2

Where;

9/325 = V2/450

325V2 = 4050

V2 = 4050/325

V2 = 12.46L

Therefore, the volume of a gas that occupies 9 L at a temperature of 325K is 12.46L.

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Answer:

3 examples are beetles, a fly, and bees. Others include ants lady bugs and butterflies

Explanation:

Explanation:

low or no reactivity ....

Neon and argon are both in Group 18 of the periodic table. The property that they are most likely to share is low or no reactivity. The correct option is d.

A chemical element found in the periodic table is argon. It is the third most common gas in the atmosphere and has an atomic number of 18.

In the periodic table, neon is a chemical element. It is a monatomic, noble gas with the atomic number 10 that is found in the environment.

Although a few liquid molecules do rise to the top, the vast majority stay close to the bottom. Furthermore, the molecules in the gas phase move more swiftly than those in the liquid phase.

Therefore, the correct option is d, low, or no reactivity regarding the mutual property of argon and neon.

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Answer:

4 moles

Explanation:

Oxygen gas is O2   (two atoms of oxygen)

2 H2 + O2  = 2 H2 O    

          one mole of oxygen gas produces TWO moles of water

               so you need 4 moles of O2 to produce 8 moles of water

The concentration of the HCl solution needed to neutralize 25 mL of 0.2 M NaOH is 0.25 M

HCl + NaOH —> NaCl + H₂O

From the balanced equation above,

CaVa / CbVb = nA / nB

(Ca × 20) / (0.2 × 25) = 1

(Ca × 20) / 5  = 1

Cross multiply

Ca × 20  = 5

Divide both side by 20

Ca = 5 / 20

Ca = 0.25 M

Thus, the concentration of the HCl solution is 0. 25 M

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Answer:

select one :c

select two:d

Answer:

Count each type of atom in reactants and products. ...

Place coefficients, as needed, in front of the symbols or formulas to increase the number of atoms or molecules of the substances. ...

Repeat steps 1 and 2 until the equation is balanced

Explanation:

Step 1: Coefficients Versus Subscripts. When approaching a chemical equation, it is important that you understand the difference between coefficients and subscripts. ...

Step 2: Sum the Atoms. ...

Step 3: Balance the First Element. ...

Step 4: Repeat for the Other Elements. ...

Step 5: Tips.

Answer:

2C6H6 + 15O2 = 12CO2 + 6H2O

Explanation:

This is a combustion reaction meaning a substance (in this case Benzene or C6H6) reacts with oxygen gas (O2) and releases energy in the form of light and heat.

so Benzene (C6H6) and Dioxygen (O2) are reactants meaning they are on the left side of the equation

Carbon Dioxide (CO2) and Water (H2O) are the products meaning they are on the right side of the equation

To balance an equation you need an equal amount of each element/compound/polyatomic on each side of the equation

so 2C6H6 + 15O2 = 12CO2 + 6H2O:

(2•6) = 12 C = (12•C) = 12 C ~ 12C = 12C

(2•6) = 12 H = (2•6) = 12 H ~ 12H = 12H

(15•2) = 30 O2 = [(12•2) • (6•1)] = 30 O2

~ 30 O2 = 30 O2

so the equation is now balanced

feel free to ask if you have any other questions

hope this helps :)

Answer:

I am first time from from from from from from

Answer:

Grasshoppers are a good source of unsaturated fats and they can lower risk of diseases.

Explanation:

Examples of agroecology method use are in Burkina Faso are conservation tillage, green manures, natural fertilisers, biological predators and so on.

Agroecology refer to an approach that use ecological processes in agricultural production systems.

The benefits of Agroecology is that it help to protect, restore and also improve agriculture and food systems when there is climate shocks and unfavorable weather conditions.

Therefore, Examples of agroecology method use are in Burkina Faso are conservation tillage, green manures, natural fertilisers, biological predators and so on.

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Answer:

Cu(NO 3) 2 (aq) + 2 NaOH (aq) → Cu(OH) 2 (s) + 2 NaNO 3 (aq) This is a precipitation reaction: Cu(OH) 2 is the formed precipitate.

Explanation:

Answer:

The first one goes second.

The thirth one goes first,

and the second goes third.

Explanation:

Answer:

A chemical symbol is a notation of one or two letters representing a chemical element.

Na2co3`s use :

It is used in photography

It is used as bleaching of wool

Answer:

Ch4-Methane ( 5 atoms )

CO2- Carbon Dioxide ( 3 atoms )

H2O- Water ( 3 atoms )

2O2- Oxygen ( 2 atoms )