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alexandr402 [8]
3 years ago
12

Please help !!! 45 minutes remaining on my test

Chemistry
2 answers:
Ksivusya [100]3 years ago
7 0
First, third, last one I had the same test
elixir [45]3 years ago
3 0
One, three, and five
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What is the name and formula of the principal aluminium compound in it?
mylen [45]
The formula is Al2O<span>3.  2 aluminium and 3 oxygen
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4 years ago
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What is the difference between a heterogeneous and homogeneous mixture? A. A heterogeneous can only be solid, and a homogeneous
muminat

Answer:

The reverse of answer B

Explanation:

In a heterogeneous mixture the phases are clearly seen distinguished but a uniform single phase is seen in a homogeneous mixture

3 0
4 years ago
Apply scientific knowledge and understanding to determine how many grams of carbon dioxide are produced from the combustion of 2
lidiya [134]

Answer:

749 grams CO₂

Explanation:

To find the amount of carbon dioxide produced, you need to (1) convert grams C₃H₈ to moles C₃H₈ (via molar mass from periodic table), then (2) convert moles C₃H₈ to moles CO₂ (via mole-to-mole ratio via reaction coefficients), and then (3) convert moles CO₂ to grams CO₂ (via molar mass from periodic table). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units. The desired unit should be in the numerator. The final answer should have 3 significant figures because the given value (250. grams) has 3 sig figs.

Molar Mass (C₃H₈): 3(12.01 g/mol) + 8(1.008 g/mol)

Molar Mass (C₃H₈): 44.094 g/mol

1 C₃H₈ + 5 O₂ ---> 3 CO₂ + 4 H₂O

Molar Mass (CO₂): 12.01 g/mol + 2(16.00 g/mol)

Molar Mass (CO₂): 44.01 g/mol

250. g C₃H₈         1 mole C₃H₈           3 moles CO₂              44.01 g
------------------  x  ----------------------  x  ----------------------  x  --------------------  =
                               44.094 g              1 mole C₃H₈            1 mole CO₂

= 749 grams CO₂

6 0
2 years ago
The Quiver tree grows in Southern Africa. Which of the following plant adaptations is likely to prevent these trees from dying o
Gekata [30.6K]

Answer:

The correct option is Ability to store water in leafy structures to prevent excess evaporation.

Explanation:

Desert plants need to have adaptations so that they can withstand the harsh conditions of the environment. In order to withstand the harsh temperatures of the desert, a quiver tree has leafy structures which help it to store water for long time. In this way, water is prevented to be lost from the tree due to evaporation. Hence, it is an effective adaptation to live in desert conditions.

The Quiver tree also has white powder on is branches to hide from the Sun's rays.

4 0
4 years ago
Did Pb2+ react with KI? Yes or No? State the reason of your answer.
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Pb2+ is lead (II) ion
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