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elena55 [62]
2 years ago
10

Ms. Johnson tells the students to make sure they bring their jackets to school tomorrow. She knows that there will be a front of

cold air moving in soon because of the change in low-
pressure system caused by jet streams. Which of the following best explains how jet streams influence local weather patterns?
They cause movements of ocean water in a continuous flow.
They can blow from north to south and form along the borders of masses of hot and cold air.
Their path fluctuates to the north or south depending on the location of hot and cold air masses.
They create a force (known as the pressure gradient force) that causes air to move.
Chemistry
1 answer:
sladkih [1.3K]2 years ago
4 0

Their path fluctuates to the north or south depending on the location of hot and cold air masses

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The density of aluminum is 2.70 g/cm3. What is the mass of a solid piece of aluminum with a volume of 2.50 cm3?
blagie [28]

Answer:

<h2>6.75 g</h2>

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question we have

mass = 2.7 × 2.5

We have the final answer as

<h3>6.75 g</h3>

Hope this helps you

4 0
3 years ago
What is the percentage composition of ca in ca(po4)2​
Keith_Richards [23]

Explanation:

Element Symbol Mass Percent

Calcium Ca 38.763%

Oxygen O 41.265%

Phosphorus P 19.972%

5 0
3 years ago
Metallic aluminum reacts with MnO2 at elevated temperatures to form manganese metal and aluminum oxide. A mixture of the two rea
Oksi-84 [34.3K]

Answer:

Explanation:

To find the theoretical yield of the equation. First identify the limiting reactant in a chemical equation.

Step 1: write out the equation and balance it.

Al+ 3mno2=3mn+ 2Alo3.

The limiting reactant is mn02 because it is not found in excess.

Step 2: convert the % to gram . All contain 67.2% mole and mno2 will be 100-67.2= 32.8

All=67.2÷100×290(total gram of the reactants)=194.88g

Mno2=32.8÷100×290g=94.12g.

Step 3:calculate the molar mass of mno2 and that of mn. The atomic mass of mn is 54.9380 and that of oxygen is 16.

Mno2=54.938+ (16)2=86.98g/mol.

Mn=54.938.

Step 4:

From your balanced equation , calculate mn.

94.12g mno2× (1mol mno2÷86.98(molarmass) of mno2×3 mol of mn/4molAl×54.938g of mn÷1mol of mn.

94.12g×1÷86.98g×3÷4×54.938÷1

=44.58g

6 0
3 years ago
How does changing the ratio of nitrogen atoms and oxygen atoms change the compounds
Reptile [31]

Answer:

Explanation:

Compounds consist of atoms of different elements. In compound the atoms are present in fixed proportion. By changing the proportion compound will changed. For example,

Nitrogen and oxygen reacted to form the compound. By changing the proportion both will form different compound.

NO₂

Nitrogen dioxide consist of one atom of nitrogen and two atoms of oxygen. Their ration is 1 :2

NO

In nitric oxide one atom of oxygen and one atom of nitrogen are present.

Their ratio is 1 : 1.

N₂O

Nitrous oxide consist of two nitrogen atoms and one oxygen. Their ratio is

2 : 1

N₂O₄

Dinitrogen tetroxide consist of two nitrogen atoms and four oxygen atoms. Their ratio will written as 2 : 4

N₂O₅

Dinitrogen pentoxide consist of two nitrogen atoms and five oxygen atoms. Their ratio will written as 2 : 5

It can be seen that by changing the ratio of atoms compounds are changed.

8 0
3 years ago
When the mixture was moved from room temperature to a higher temperature, the mixture turned darker brown. Which of the followin
Wittaler [7]

Answer:

The equilibrium between the two forms of the gas is disturbed at high temperatures.

7 0
3 years ago
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