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LekaFEV [45]
3 years ago
15

Which statements are scientific statements? Select all the correct answers. People who drive red cars are more prone to accident

s. Children from families that have pets are more likely to develop allergic reactions. Chinese cuisine is tastier than Mexican cuisine. Those in the younger generation should learn to respect their elders. People who walk to work are healthier than those who commute to work in vehicles.
Chemistry
1 answer:
mojhsa [17]3 years ago
3 0

Explanation:

Scientific statements are define as those statements which are testable and can be falsified or proven wrong.

So, the scientific statements are:

  • People who drive red cars are more prone to accidents.
  • Children from families that have pets are more likely to develop allergic reactions.
  • People who walk to work are healthier than those who commute to work in vehicles.
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When nitrogen gas (N2) reacts with hydrogen gas(H) ammonia gas (NH3) is formed. How many grams of hydrogen gas are required to r
kupik [55]

Mass of Hydrogen gas required to react : 0.936 g

<h3>Further explanation</h3>

Reaction on Nitrogen gas and Hydrogen gas to produce Ammonia gas

N₂ (g) + 3 H₂ (g) ⇒ 2 NH₃ (g)

Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters / mol

so mol Nitrogen for 3.5 L at STP :

\tt mol=\dfrac{3.5~L}{22.4~L}=0.156

From the equation, mol ratio of N₂ : H₂ = 1 : 3, so mol H₂ :

\tt \dfrac{3}{1}\times 0.156=0.468

then mass of Hydrogen(MW= 2 g/mol) :

\tt mass=mol\times MW\\\\mass=0.468\times 2\\\\mass=0.936~g

7 0
3 years ago
How many grams are in 4.23 x 1024 atoms of He?
Dmitry [639]

Answer:

28.11g

Explanation:

Step 1:

Background understanding:

From Avogadro's hypothesis, 1 mole of any substance contains 6.02x10^23 atoms. This also indicates that 1 mole of helium (He) contains 6.02x10^23 atoms.

1 mole of He = 4g

Step 2:

Determination of the mass of He that contain 4.23x10^24 atoms. This is illustrated below:

4g of He contains 6.02x10^23 atoms.

Therefore Xg of He will contain 4.23x10^24 atoms i.e

Xg of He = (4x4.23x10^24)/6.02x10^23

Xg of He = 28.11g

Therefore, 28.11g of He contains 4.23x10^24 atoms

7 0
3 years ago
What is the percent yield of a reaction in which 47.5 g tungsten (VI) oxide (WO3) reacts with excess hydrogen gas to produce met
Katarina [22]

Answer:

The percent yield of a reaction is 85.04%

Explanation:

:WO_3+3H_2\rightarrow W+3H_2O

Mass of WO_3 = 47.5g

Molar mass of WO_3 = 232 g/mole

Molar mass of H_2O= 18 g/mole

Volume of water obtained from the reaction , V= 9.40mL

Mass of water = m = Experimental yield of water

Density of water = d = 1.00 g/mL

M=d\times V = 1.00 g/mL\times 9.40 mL=9.40 g

Moles of tungsten(VI) oxide =\frac{47.5 g}{232 g/mol}=0.2047 mol

According to recation 1 mole of tungsten(VI) oxide gives 3 moles of water, then 0.2047 moles of tungsten(VI) oxide will give:

\frac{3}{1}\times 0.2047 mol=0.6141 mol

Mass of 0.6141 moles of water:

0.6141 mol × 18 g/mol = 11.054 g

To calculate the percentage yield of reaction , we use the equation:

% yield = {\frac{Experimental yield}{theoretical yield} \times 100

\frac{9.40}{11.054} \times 100\\\\= 85.04

The percent yield of a reaction is 85.04%

7 0
3 years ago
A 75.0 mL 75.0 mL aliquot of a 1.70 M 1.70 M solution is diluted to a total volume of 278 mL. 278 mL. A 139 mL 139 mL portion of
Vlada [557]

Answer:

0.210 M

Explanation:

<em>A 75.0 mL aliquot of a 1.70 M solution is diluted to a total volume of 278 mL.</em>

In order to find out the resulting concentration (C₂) we will use the dilution rule.

C₁ × V₁ = C₂ × V₂

1.70 M × 75.0 mL = C₂ × 278 mL

C₂ = 0.459 M

<em>A 139 mL portion of that solution is diluted by adding 165 mL of water. What is the final concentration? Assume the volumes are additive.</em>

Since the volumes are additive, the final volume V₂ is 139 mL + 165 mL = 304 mL. Next, we can use the dilution rule.

C₁ × V₁ = C₂ × V₂

0.459 M × 139 mL = C₂ × 304 mL

C₂ = 0.210 M

7 0
3 years ago
Read 2 more answers
Which of the following organisms evolved after amphibians?
vovangra [49]

Answer:

Reptiles, marsupials, dogs, and cats

Explanation:

3 0
3 years ago
Read 2 more answers
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