PLZZ!!!- I NEED THIS RIGHT NOWA block is pulled 0.90 m to the right in 2.5 s.

Calcium and water form calcium hydroxide and hydrogen gas also called what type of reaction

Gekata [30.6K]

Reaction of calcium with water
Calcium reacts slowly with water. This is in contrast with magnesium, immediately above calcium in the periodic table, which is virtually unreactive with cold water. The reaction forms calcium hydroxide, Ca(OH)2 and hydrogen gas (H2).

4 0

3 years ago

Why does Fluorine have a higher electronegativity than Carbon?

Gala2k [10]

Answer:

Fluorine has a higher electronegativity than carbon

Explanation:

Electronegativity trend

-As you go from left to right across the periodic table, the electronegativity increases.

-As you go from top to bottom, the electronegativity decreases.

-We know that both carbon and fluorine are in the same energy level or period 2. However, Carbon is in group 14, which has 4 valence electrons, while fluorine is in group 17, which has 7 valence electrons. Therefore, fluorine has a higher electronegativity because fluorine is desperately wanted to gain 1 more valence electron to become stable (octet rule).

4 0

3 years ago

Can you locate any mountains in the tropical zones?

krek1111 [17]

Answer:

At even lower levels mountain lands grade into other types of landform and vegetation—e.g., tropical or temperate forest, savanna, scrubland, desert, or tundra. The largest and highest area of mountain lands occurs in the Himalaya -Tibet region; the longest nearly continuous mountain range is that along the west coast of the Americas from Alaska in the north to Chile in the south.

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Explanation:

4 0

3 years ago

To understand several methods of measuring gas pressure. Gases exert a measurable pressure (P) on the walls of their container.

sammy [17]

Answer:

1. 0.9539 atm

2. 3112.732 mmHg

3. The third question is an incomplete one, as a diagram showing a gas tube with a measurement of the mercury-filled manometer should be included in the question. This will enable easy calculation of the pressure (in atmospheres) of the gas inside the container connected to an open-end, mercury-filled manometer. However, an example is explained to give a clear understanding on how it's been calculated.

Explanation:

1. On a rainy day, a barometer reads 725 mmHg. Convert this value to atmospheres.

The answer is:

1 atm=760 mmHg=101,325 Pa

so, 725 mmHg to atm =

725 mmHg ÷ 760 mmHg = 0.9539 atm

2. A closed container is filled with oxygen. The pressure in the container is 415 kPa. What is the pressure in millimeters of mercury?

The answer is :

1 atm=760 mmHg=101,325 Pa

First, 415 kPa should be converted to pa

1 kPa = 1000 pa

415 kPa = 415,000 pa

Afterwards, pa should be converted to atm

415,000 pa ÷ 101,325 Pa = 4.0957 atm

Finally, atm should be converted to mmHg

4.0957 × 760 = 3112.732 mmHg

3. What is the pressure (in atmospheres) of the gas inside the container connected to an open-end, mercury-filled manometer?

The answer is:

atmospheric pressure = density of mercury x acceleration due to gravity x height of column of mercury.

Let us use for instance, 20 cmHg as the pressure in the gas. To find pressure (in atmospheres) of the gas inside the container connected to an open-end, mercury-filled manometer, we have,

0.95atm + ( (20cmHg x 10mm) ÷ 1cm) ) x (1atm ÷ 760mmHg) = 1.21 atm

where, 0.95atm is the atmospheric pressure.

6 0

3 years ago

5 Facts about Geology

Bingel [31]

1-There are 18 volcanoes in the US with the potential to erupt again, all of them in Alaska, Hawaii and the West Coast states.

2-Rubies and sapphires are actually the same mineral - corundum. The basic chemical formula of corundum is Al2O3, but traces of iron stain the mineral red (ruby) while traces of chromium or titanium stain the mineral blue (sapphire).

3-Rubies, sapphires and emeralds are all more rare than diamonds.

4-Not all diamonds are transparent. They come in a variety of colors (called "fancies"), including yellow, green, blue, orange, brown ("champagne"), purple, grey, black (called carbanado, recently shown to be meteroic), milky white, pink, and red. Red is by far the rarest.

5-Antacids taste like chalk because they ARE chalk, a.k.a. calcium carbonate.

Hope this helps, Give a thanks ! Haha

4 0

3 years ago