which of the following is the poorest conductor electricity
Calcium
silicon
cobalt
sodium
fluorine

Answer:

I'm pretty sure its C. limestone.

4 items being divided equally among 3 people

Answer:

Salt and water

Explanation:

The reaction of an acid and a base forming a salt and water.

Answer: 60 minutes per hour, sixty miles per hour, therefore, one mile per minute.

Explanation:

Answer:

Answer: PV/RT = n = N equals startfraction P V over R T endfraction Explanation:

Answer:

You need a mixture of positive and negative ions

Explanation:

A mixture is used as the electrolyte because a mixture of positive and negative ions are needed.

This consists of two or more chemical substances which aren't chemically bonded together.

Electrolyte on the other hand conducts electricity when dissolved with the help of the mixture of positive and negative ions.

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Answer:

sun gives you vitamin D

Explanation:

Our body creates vitamin D from direct sunlight on our skin when we're outdoors.

Based on the data provided;

The ideal gas equation relatesthe pressure, volume, moles and temperature of a gas.

The moles of helium gas is calculated using the Ideal gas equation:

n is the number of moles of gas

R is molar gas constant = 8.314 L⋅kPa/Kmol

P is pressure = 239 kPa

T is temperature = 21°C = 294 K

V is volume = 12.8 L

Therefore;

n = PV/RT

n = 239 × 12.8 / 8.314 × 294

n = 1.25 moles

The number of moles of helium gas is 1.25 moles

At peak temperature, T = 46°C = 319 K

Using P1/T1 = P2/T2

P2 = P1T2/T1

P2 = 239 × 319/294

P2 = 259.3 kPa

The pressure at peak temperature is 259.3 kPa

At 42°C, T = 315 K

Using P1/T1 = P2/T2

P2 = P1T2/T1

P2 = 239 × 315/294

P2 = 256.07 kPa

Since the internal pressure is above 256 kPa, the balloon will burst.

The pressure should be reduced to a value less than 256 kPa by reducing the temperature.

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From what we know, we can confirm that the solution that is likely to have the greatest concentration of H+ is orange juice.

This has to do with the effects of H+ in a substance. The presence of hydrogen ions causes the substance to be more acidic, and the higher the concentration the higher the acidity of the substance. Since orange juice is the only acidic solution listed, we can know it will have the highest concentration of H+ ions.

Therefore, due to its acidic nature, we can confirm that the solution that is likely to have the greatest concentration of H+ is orange juice.

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Answer:

Explanation:

Balanced Chemical Equation:

                            Cu + 2 AgNO₃ → Cu(NO₃)₂ + 2 Ag

Step 1: Find Limiting Reagent

Moles of Cu:

                   Mole = 3 g / 63.55 g/mol = 0.04721 mol

Moles of AgNO₃:

                   Moles = 3.85 g / 169.87 g/mol = 0.022664 mol

Also, Mole ratio of Cu : AgNO₃ is 1 : 2. Hence, 0.04721 mol of Cu will require 0.09442 mol of AgNO₃. This means, AgNO₃ is the limiting reagent.

Step 2: Calculate moles of Ag:

0.022664 mol of AgNO₃ will produce 0.022664 mol of Ag because both have same ratio in balanced chemical equation.

Step 3: Calculate mass of Ag:

                      Mass = 0.022664 mol × 107.87 g/mol = 2.4447 g

Answer:

A, and C are foods that wolves eat.

Explanation: Hope this helps

Answer:

binds to substrate

Explanation:

Answer:

Yellowing of leaves

Explanation:

Involves the colour change in leaves whereby less amount of chlorophyll is produced

Answer:

burning, cooking, milk becoming curd, rusting of iron

Answer:

216/84 Po + 4/2 He a

Explanation:

Answer:

Problem: Polonium-210, 210Po, decays to lead-206, 206Pb, by alpha emission according to the equation 21084Po → 20682Pb + 42He

Explanation:

Answer:

C. through concentrated sulphuric acid and then over heated copper

Answer:

it make poisionus police come and took away

Answer:

13.4g

Explanation:

we know that:

1 mole = 6.02 × 10²³ atoms

make the unknown number of moles = x

x = 7.1 × 10²² atoms

putting them both together:

1 mole = 6.02 × 10²³ atoms

x = 7.1 × 10²² atoms

Cross multiply:

6.02 × 10²³ x = 7.1 × 10²²

divide both sides by 6.02 × 10²³

[tex]x = \frac{7.1 \times 10²² }{ 6.02 × 10²³} [/tex]

[tex]x = \frac{71}{602} [/tex]

we now have the number of moles of Al₂CO₃

to calculate the grams (mass):

[tex]moles = \frac{mass}{relative \: formula \: mass} [/tex]

[tex]mass = moles \: \times \: relative \: formula \: mass[/tex]

add up all of the atomic masses of Al₂CO₃ to calculate relative formula mass:

(27 × 2) + 12 + (16 × 3) = 114

the grams (mass) of Al₂CO₃:

[tex] \frac{71}{602} \times 114 = 13.4g[/tex]

Hydrogen peroxide is not the chemical causing the reaction.

Generally,Catalyses is an enzyme which breaks H2O2 into H2O and O2. there will be no reaction if we combine H2O with H2O2,

H2O2 receives dissolved in water except displaying any reaction. So they are used as bad manipulate in the test.

Therefore, it shows that hydrogen peroxide is not the chemical causing the reaction

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Answer:

A is it

Explanation:

Answer:

C

Explanation:

The reaction represents transmutation, which is a nuclear reaction where electrons are transferred.

This problem is providing us with the percent composition of a compound containing sodium, bromine and oxygen. Thus, the empirical formula is required and found to be NaBrO₃.

In chemistry, empirical formulas are used in order to figure out the minimum whole-number representation of a molecular formula, which contains the actual number of atoms.

Thus, we start determining it by assuming the given percentages as masses and calculating the moles with the atomic mass of the involved elements:

[tex]n_{Na}=\frac{15.24}{22.99}=0.700 \\\\n_{Br}=\frac{52.95}{79.90} =0.663\\\\n_O=\frac{31.81}{16.00}=1.99[/tex]

Next, we divide by the 0.633 as the smallest number of moles in order to determine their subscripts in the chemical formula:

[tex]Na:\frac{0.700}{0.663}=1\\ \\Br:\frac{0.663}{0.663}=1\\ \\O=\frac{1.99}{0.663} =3[/tex]

Hence, the empirical formula turns out to be NaBrO₃.

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Answer:

I believe this is a measuring cylinder? and i think the volume is 35cm^3

Explanation:

hope this helps!

One adaptation that organisms living in an aquatic ecosystem might have is the ability to regulate their salt concentration.

Organisms are living species that live on the planet earth.

There are types of organisms categorized by the environment they live.

Organism that can survive only in water is called an aquatic organism.

We have,

One adaptation that organisms living in an aquatic ecosystem might have is the ability to regulate their salt concentration.

Aquatic environments can have varying levels of salinity, and some organisms need to maintain a specific salt concentration in their bodies to survive.

For example, marine fish have kidneys that can produce very concentrated urine to prevent them from losing too much salt in their surroundings, while freshwater fish have specialized cells in their gills that actively pump salt out of their bodies to maintain the appropriate balance.

Similarly,

Some marine invertebrates, such as crabs and mussels, can regulate the amount of salt they take in by actively transporting ions across their gills or other specialized structures.

This adaptation helps the organism to maintain the proper fluid balance and avoid dehydration or over-hydration, which can be lethal.

Thus,

One adaptation that organisms living in an aquatic ecosystem might have is the ability to regulate their salt concentration.

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Long-billed curlews feed on insects and worms mainly. Thus, their population will drastically reduce if there is a decrease in their food availability.

One of the factors that affect the population size of a species is food availability.

Inadequate food increases intraspecies competition and results in more deaths. This leads to a reduction in the population size.

Long-billed curlews are a species of bird that feeds on insects and worms when inland. If an event leads to a decrease in the number of earthworms, spiders, and insects in an area, this will greatly reduce the population of long-billed curlews.

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Answer:

it is then exhaled

Explanation:

Carbon dioxide passes from the blood into the alveoli and is then exhaled.