can someone please help me? i will give brainliest

Answer:

A: They bring cool air.

Explanation:

Took the test and got it correct. :)

Jet streams are fast flowing meandering air currents. Polar jet streams bring cool air through the atmosphere. Polar jets meet subtropical jets at some regions.

The polar jet stream, which travels through the lower layers of the atmosphere in the Northern Hemisphere, is a swiftly moving band of westerly winds.

The confluence of warm air ascending from the tropics and cold air masses descending from the arctic produces the jet. The denser cold air lowers and deflects the warmer air areas north, creating deep troughs and steep ridges that give the jet stream its wavy appearance.

As pockets of cold air intermittently sneak down from the Arctic, this pattern spreads across the mid-latitudes of North America, Europe, and Asia, producing opposing waves and flows that speed eastward due to the earth's rotation.

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Answer:

If something glows in the dark it is phosphorescent.

Answer:

chemical properties can only be measured only by changing a substance chemical identity

Explanation:

apex

Answer:

Mg

Explanation:

If one were comparing just the neutral atoms Mg and S, the S atom would be smaller as both elements are in the same period and sulfur is more to the right

Answer:

Im pretty sure its B. is released by salivary glands.

Explanation:

Answer:

37.9 or 38 grmas approximately

Answer:

I will not consider electronic mass here. We know (the masses should have been provided in the question!) that the neutron mass is

1.008701

⋅

amu

and the proton mass is

1.007316

⋅

amu

.

Explanation:

Question answered

Answer:

The Answer would be A. April

Explanation:

Least amount of rainfall out of all the months we have to choose from.

Answer:

3564 = 3.564 x 10^3

Explanation:

i.e expresing the value in standard form.

Answer:

3 ................................

Answer: 3

Explanation:

yes

Answer:

Styrofoam could be heavier than a rock depending on how much weight you put on it,

Water is heavier than a ping pong ball,

A gold ring is not heavier than a pencil,

Oil is heavier than water because of the combined mass.

A large log is heavier than a small rock.

Explanation:

Answer:

Explanation:

molecular weight of potassium hydrogen phthalate = 204

.8094 g of KHP = .8094 / 204 = 3.967 x 10⁻³ moles

3.967 x 10⁻³ moles of KHP must have reacted with 3.967 x 10⁻³ moles of NaOH

concentration of NaOH = 3.967 x 10⁻³ / 40.25 x 10⁻³

= .098 M .

Answer:

The hot gas molecules are the same pressure as the air outside the can. When the can is placed in cold water upside down, the hot gas water molecules are cooled very rapidly. ... Since the air pressure outside the can is stronger than that inside the can, it causes the can to collapse.

Explanation:

Answer:

Hi!

So, a homogeneous mixture is when the parts that make up the mixture are all mixed in perfectly evenly, so they're only appearing as one uniform substance.

In a heterogeneous mixture, the pieces are not evenly mixed. A pizza has separate parts, like the crust and toppings, so it's a heterogeneous mixture.    

Answer: C

Explanation:

Answer:

i think plumber

Sodium hydroxide is generally referred to as caustic soda used in soaps and cleaners. A plumber would most likely be required to work with sodium hydroxide. Hence, option A is correct.

Soaps, paper, explosives, dyes, and petroleum are all made with sodium hydroxide. The presence of sodium hydroxide in a cleanser or a homemade aqueous solution converts these disconcerting fats into soaps, which are easily removed by water.

They have no odor and no color making them react with water and strong acids to produce salts. They are considered ionic compounds with sodium cation and chloride anion. They also are used in oxide coating and cleaning of metals.

Therefore, option A. plumber will most likely use sodium hydroxide.

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Answer:

Black

Explanation:

hope it helps

have a nice time ..,

Answer:

Since we are adding more water to an alcohol solution,

the volume of alcohol in the alcohol will be the same but the volume percent of alcohol will decrease

Initial Volume of Alcohol in the solution:

We are given that 70% of the 2.1 mL solution is alcohol

So, Finding 70% of 2.1

70/100 * 2.1 = 1.470 mL alcohol

Volume of Water in the Solution:

In our initial solution, we have (2.1 - 1.47) mL water

and we add an additional 6.7 mL water in the solution

Hence,

the total amount of water in the solution = (2.1- 1.47) + 6.7

Total amount of water in the solution  = 0.63 + 6.7

Total amount of water in the solution = 7.33 mL

Volume of the final solution = 8.8mL

Percent Alcohol in the new mixture:

Now that we know the volume of alcohol and the volume of water in our mixture, we can now find the percent composition of alcohol

Percent of alcohol (%v/v) = Amount of alcohol / 100mL of solution

Percent of alcohol = (1.47 / 8.8) * 100

Percent of alcohol = 0.167 * 100

Percent of alcohol = 16.7

Therefore, in a 100mL solution, we will have 16.7 mL alcohol

Answer:

the last one, (A zinc, Zn, atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus)

A zinc, Zn, atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus accurately describes the atoms of a specific element ,therefore option (d) is correct.

Zinc is placed in group 12 of the periodic table. It is in the first period of transition or d block elements, and fourth period of the periodic table.

Zinc is a metal. It has two valence electrons that are lost easily. Zinc forms positive ions with 2+ charges, like the metals of the alkaline earth family.

Uses of zinc element -:

A zinc, Zn, atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus accurately describes the atoms of a specific element ,hence option (d) is correct.

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The two properties which can be measured from the given information are streak and cleavage of the mineral.

Minerals are naturally forming inorganic substances having crystal structure and metallic characteristics. They have a definite chemical composition and  homogeneity.

Streak is the color of powder form of mineral and cleavage is how the mineral cleave when we cut through a plane.  Hardness says how much hard the solid is.

When the mineral breaks into cubes when struck with a hammer, we measure its cleavage properties. The red trail on scrapping indicates the streak of the mineral.

Hence, the two properties we can measure from breaking by hammer and scrapping by an unglazed porcelain are its cleavage and streak.

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Answer:D. Sulfur Hexafluride

Explanation:

D. Sulfur Hexafluride

Explanation:

above it says the substance floats above water at room temperature and lists some substances and their density at room temp!

we know that the density of water is 1.0 so the substance in order for it to float has to be less than 1.0 and the densities for Sulfer Hexa, are all less than 1!!

Answer:

AR(18)  

Explanation:

Try that it should work

                                                                                                                                         *(

Answer:

Lithium would require the least amount of energy to remove an electron

Answer:

The answer is actually sodium

Explanation:

Lithium actually requires more than sodium.

Answer:

I think it's b: ne

Explanation:

its just a wild guess

Answer:

Propionic acid

Explanation:

Step 1: Write the generic neutralization reaction

HA + NaOH ⇒ NaA + H₂O

Step 2: Calculate the reacting moles of NaOH

21.85 mL of 0.1062 M NaOH react.

0.02185 L × (0.1062 mol/L) = 2.320 × 10⁻³ mol

Step 3: Calculate the reacting moles of HA

The molar ratio of HA to NaOH is 1:1. The moles of HA are 1/1 × 2.320 × 10⁻³ mol = 2.320 × 10⁻³ mol.

Step 4: Calculate the molar mass of HA

0.1719 g of HA correspond to 2.320 × 10⁻³ moles.

MM = 0.1719 g/2.320 × 10⁻³ mol = 74.09 g/mol

With this molar mass, the most likely acid is propionic acid.

Answer: Non-magnetic

Explanation:

Answer:

br is a non magnetic. hope this helps.

Answer:

On Question 3

Explanation:

try using any type or liquid like water, milk, soda, juice, coffee, tea, beer, or wine or any type and use the following questions by using a measuring cup from the kitchen tooling shelf. Use that to answer the question and see if that helps. your welcome btw

Answer:

Refraction of waves involves a change in the direction of waves as they pass from one medium to another. ... Sound waves travel slower in cooler air than they do in warmer air.

Explanation: