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2 years ago

What usually happens to ice before it changes into gas?

1 answer:

6 0

<span>Sublimation is the conversion between the solid and the gaseous phases of matter, with no intermediate liquid stage.</span>

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The germ theory of disease states that many diseases are caused by the presence and action of specific

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The germ theory of disease states that many diseases are caused by the presence and action of specific <span>microorganisms.</span>

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3 years ago

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When is the Doppler Effect perceived by a person?

disa [49]

Answer:

C is the correct option.

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2 years ago

A towing company charges $40 to hook a car and $1.70 for each mile that is towed. Write an

stepan [7]

Given:

Fixed charges = $40

Variable charges = $1.70 for each mile.

To find:

The equation that represents the total cost y for x miles towed.

Find the y-intercept and interpret its meaning in the context of the situation.

Solution:

Let y be the total cost for x miles.

Fixed charges = $40

Variable charges for 1 mile = $1.70

Variable charges for x mile = $1.70x

Now,

Total changes = Fixed charges + Variable changes

$y=40+1.70x$

Therefore, the required equation is $y=40+1.70x$ .

Putting x=0 in the above equation, we get

$y=40+1.70(0)$

$y=40+0$

$y=40$

Therefore, the y-intercept is 40. It means the charges to hook a car is $40 if it is towed 0 miles.

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3 years ago

List 3 factors that can speed up the rate of chemical reactions

zysi [14]

Answer:

Temperature
Greater Surface Area
Catalysts

Explanation:

Temperature

An increase in temperature typically increases the rate of reaction. An increase in temperature will raise the average kinetic energy of the reactant molecules. Therefore, a greater proportion of molecules will have the minimum energy necessary for an effective collision (Figure. 17.5 “Temperature and Reaction Rate”).

Greater Surface Area

The rate of a chemical reaction can be raised by increasing the surface area of a solid reactant. ... more particles are exposed to the other reactant. there are more collisions. the rate of reaction increases.

Catalysts

A catalyst is a substance that can be added to a reaction to increase the reaction rate without getting consumed in the process. Catalysts typically speed up a reaction by reducing the activation energy or changing the reaction mechanism.

Hope this help!!!

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2 years ago

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Down syndrome in humans may result from. A a person inheriting a recessive allele. B sickle-shaped cells becoming stuck in blood

katen-ka-za [31]

C born with an extra chromosome

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