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kotykmax [81]
3 years ago
7

Which of the following could be considered a scientific statement?

Chemistry
2 answers:
schepotkina [342]3 years ago
8 0
Ants live In colonies
Alexus [3.1K]3 years ago
6 0

Answer: Ants live in colonies.

Explanation:

The 1st, 3rd, and 4th, answer choice are all considered as opinions.

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19.3 g of cadmium hydroxide reacted with 15.21 g of hydrobromic acid. How many grams of water can be made?
Alecsey [184]

Answer:

m_{H_2O}=3.384gH_2O

Explanation:

Hello,

In this case, the chemical reaction is:

Cd(OH)_2+2HBr\rightarrow CdBr_2+2H_2O

Thus, we first identify the limiting reactant by computing the yielded moles of water by both of the reactants:

n_{H_2O}^{by\ Cd(OH)_2}=19.3gCd(OH)_2*\frac{1molCd(OH)_2}{146.4gCd(OH)_2}*\frac{2molH_2O}{1molCd(OH)_2}=0.264molH_2O\\\\n_{H_2O}^{by\ HBr}=15.21gHBr*\frac{1molHBr}{80.9gHBr}*\frac{2molH_2O}{2molHBr}=0.188molH_2O

In such a way, since HBr yields less water than cadmium hydroxide, we infer that HBr is the limiting one, therefore, the yielded mass of water are:

m_{H_2O}=0.188molH_2O*\frac{18gH_2O}{1molH_2O}\\ \\m_{H_2O}=3.384gH_2O

Regards.

4 0
3 years ago
Why does the sun move from night-time to dayime?
valentina_108 [34]

Answer: Rotation cause by the earths orbit and gravity

Explanation:

4 0
2 years ago
Read 2 more answers
When 2.16g of H2 reacts with excess O2 by the following equation, 258 kJ of heat are released. What is the change of enthalpy as
alekssr [168]

Answer:

-241 kJ/mol

Explanation:

Let's consider the reaction of hydrogen with excess oxygen to form water.

2 H₂ + O₂ ⟶ 2 H₂O

When 2.16g of hydrogen reacts with excess oxygen, 258 kJ of heat are released, that is, Q = -258 kJ. Considering that the molar mass of hydrogen is 2.02 g/mol, the change of enthalpy associated with the reaction of 1.00 mol of hydrogen gas is:

ΔH° = -258 kJ/2.16 g × (2.02 g/1.00 mol) = -241 kJ/mol

8 0
3 years ago
What is the effect of an expansionary fiscal policy upon an economy with an increasing budget deficit and growing national debt?
bixtya [17]

Answer:

increased deficit spending and increasing or growing national debt

Explanation:

If expansionary fiscal policy continues in an economy with an increasing budget deficit and a growing national debt, such an economy will experience high inflation. Expansionary fiscal policy means an increase in government spending. In other words, fiscal policy is when the government commits or spends more money on infrastructure or other budget items or lower taxes that lead to an increase …

3 0
3 years ago
What property of air allows it to flow down to the floor?​
Mandarinka [93]

I am not sure about my answer, but I think that it's density allows it to fall to the ground/floor.

5 0
3 years ago
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