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Complete this sentence. The electrical conductivity of a sample will ____________ when the size of the sample increases.
decrease
stay the same
increase
be unable to be determined

Answer:

Continental drift was a theory that explained how continents shift position on Earth's surface. Set forth in 1912 by Alfred Wegener, a geophysicist and meteorologist, continental drift also explained why look-alike animal and plant fossils, and similar rock formations, are found on different continents.

Explanation:

Answer:

The corrects answers are 18-C / 19-D / 20-B / 21-C

Explanation:

18) The process of deposition causes rock and soil to slowly be gained. Deposition is the geological process in which soil and rocks are added to a landform.

19) Waves crashing down on the rocks cause the rocks close to the water were smooth. This is caused by the continuous wear of the sea waves on the surface of the rock.

20) One common beach sight formed by sand dune. Waves deposit sediments in offshore areas, where they accumulate like sand dunes. This accumulation occurs when waves collide in shallow water.

21)If the priority is for the batteries to last longer, the one with the longest battery life should be chosen. In this case, it is 24 hours.

23) I don't have the picture, so I cant tell you the correct answer.

Have a nice day!

Answer:

Fossil fuels:

-Coal

-Oil

-Natural gas

ect

Explanation:

Answer:

The cathode is a negatively charged electrode by which electrons enter an electric device.

The formula for calculating the volume of a solid object depends on the shape. We have specific formulas for shapes like cube, cylinder, and rectangular prism. Moreover, the volume can be computed indirectly by dividing the mass by its density.

The formula for calculating the volume of a solid object varies depending on the shape of the object. For instance, the volume of a cube is calculated by cubing the edge length (V = s³), whereas the volume of a cylinder is found by multiplying the area of the base by the height (V = πr²h). Similarly, the volume of a rectangular prism can be calculated using the formula V = lwh (length x width x height).

Apart from these, there are formulas for other regular shapes like a sphere, cone, etc. Always ensure conversion to suitable units before calculation.

Nonetheless, in most scenarios, the volume of a substance can be deduced by dividing the mass by its density (V = mass/density).

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Answer:

developed insulation

Explanation:

The empirical formula of the compound is NH₂, indicating one mole of nitrogen and two moles of hydrogen in the simplest whole number ratio.

Determining the empirical formula:

1. Set up the equations:

Let x be the mass of nitrogen (N) in the compound.

Let y be the mass of hydrogen (H) in the compound.

We know the total mass of the compound is 3.42 g: x + y = 3.42 g (Equation 1).

2. Balance the combustion reactions:

The combustion of nitrogen forms nitrogen dioxide (NO₂): N + O₂ → NO₂.

The combustion of hydrogen forms water (H₂O): 2 H + 1/2 O₂ → H₂O.

3. Use the combustion reactions to calculate the mass of nitrogen:

From the first combustion reaction, we can relate the mass of NO₂ to the mass of N:

9.82 g NO₂ * (1 mol NO₂ / 46 g NO₂) * (1 mol N / 1 mol NO₂) * (14 g N / mol) = x

This simplifies to x = 2.989 g N.

4. Calculate the mass of hydrogen:

Subtract the mass of nitrogen from the total mass to find the mass of hydrogen: y = 3.42 g - 2.989 g = 0.4313 g H.

5. Convert mass to moles:

Divide the mass of each element by its atomic mass to get the number of moles:

N: 2.989 g / 14 g/mol = 0.2135 mol

H: 0.4313 g / 1 g/mol = 0.4313 mol

6. Find the simplest whole number ratio of moles:

Divide both the number of moles by the smallest number of moles (0.2135 mol for nitrogen in this case):

N: 0.2135 mol / 0.2135 mol = 1

H: 0.4313 mol / 0.2135 mol ≈ 2

7. Write the empirical formula:

Based on the whole number ratio of moles, the empirical formula is NH₂.

Final answer:

The combustion analysis of a nitrogen and hydrogen compound resulted in 9.82g of NO₂ and 3.85g of H₂O, leading to the calculation of moles of N and H and determination of the empirical formula as NH₂.

Explanation:

To determine the empirical formula of the compound containing only nitrogen and hydrogen from the combustion results, we will follow a step-by-step process:

First, we convert the mass of NO₂ and H₂O to moles:

Next, we use the moles of NO₂ to find moles of N (one N atom per molecule of NO₂) and the moles of H₂O to find moles of H (two H atoms per molecule of H₂O):

Finally, we compare the mole ratio of H to N, which gives roughly 2:1 ratio, indicating that the empirical formula of the compound is NH₂.

Final answer:

To calculate the percent yield of NaCl, one would use the formula of (Actual Yield / Theoretical Yield) × 100%. The percent yield of NaCl is approximately 57.96%.

Explanation:

To find the percent yield of NaCl, we first need to determine the theoretical yield of NaCl, which is the maximum amount that could be produced according to the balanced chemical equation.

The balanced chemical equation for the reaction between CuCl and NaNO3 to produce NaCl is:

[tex]\[ CuCl + 2NaNO_3 \rightarrow 2NaCl + Cu(NO_3)_2 \][/tex]

From the equation, we can see that 1 mole of CuCl produces 2 moles of NaCl.

1. Calculate the number of moles of CuCl used:

[tex]\[ \text{Molar mass of CuCl} = 63.5 + 35.5 = 99 \, \text{g/mol} \][/tex]

[tex]\[ \text{Number of moles of CuCl} = \frac{31.0 \, \text{g}}{99 \, \text{g/mol}} = 0.313 \, \text{mol} \][/tex]

2. Since 1 mole of CuCl produces 2 moles of NaCl, calculate the number of moles of NaCl produced:

[tex]\[ \text{Number of moles of NaCl} = 2 \times 0.313 \, \text{mol} = 0.626 \, \text{mol} \][/tex]

3. Calculate the theoretical yield of NaCl in grams:

[tex]\[ \text{Theoretical yield of NaCl} = \text{Number of moles} \times \text{Molar mass of NaCl} \][/tex]

[tex]\[ \text{Molar mass of NaCl} = 23 + 35.5 = 58.5 \, \text{g/mol} \][/tex]

[tex]\[ \text{Theoretical yield of NaCl} = 0.626 \, \text{mol} \times 58.5 \, \text{g/mol} = 36.591 \, \text{g} \][/tex]

Now that we have the theoretical yield and the actual yield (21.2 g), we can calculate the percent yield using the formula:

[tex]\[ \text{Percent yield} = \frac{\text{Actual yield}}{\text{Theoretical yield}} \times 100\% \][/tex]

[tex]\[ \text{Percent yield} = \frac{21.2 \, \text{g}}{36.591 \, \text{g}} \times 100\% \][/tex]

[tex]\[ \text{Percent yield} \approx 57.96\% \][/tex]

Therefore, the percent yield of NaCl is approximately 57.96%.

The formation of compound takes place by the combination of two or more different atoms. The combination of atoms takes place in a definite proportions. Compounds with different proportions of atoms have different properties.

Water ([tex]H_2O[/tex]) is composed of the same element as hydrogen peroxide ([tex]H_2O_2[/tex]) that is hydrogen ([tex]H[/tex]) and oxygen ([tex]O[/tex]). The combination of hydrogen and oxygen atoms in water is in [tex]1:2[/tex] ratio whereas the combination of hydrogen and oxygen atoms in hydrogen peroxide is in [tex]2:2[/tex] ratio. So, the properties of water and hydrogen peroxide are different as the arrangement of atoms is different in the compound.

Hence, the correct option is they have different properties because the arrangement of atoms is different.

Answer: The correct answer is (A).

Explanation:

Homogeneous Mixtures are the mixture in which:

Answer is: Friedrich Wohler was working with ammonium cyanate & found crystals of urea in his breakers.

Urea is an organic compound with chemical formula CO(NH₂)₂

Friedrich Wohler's discovered in 1828 that urea can be produced from inorganic starting materials.

In human body, the source of these two nitrogen atoms are ammonia (NH₃) from nitrogen compounds (mostly metabolism of amino acids) through which excess nitrogen is eliminated from organisms.

This process is called urea cycle, which extracted nitrogenous wastes. The liver forms it by combining two ammonia molecules with a carbon dioxide molecule.