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3 years ago

What do you notice about the relationship between the force strength and the size of the velocity change?

Chemistry

1 answer:

ella [17]3 years ago

4 0

Answer:

a mass is constant during -free-weight training,a greater impulse will result in greater velocity.therefore as a generation of force greater than weight of the resistance increases.

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Small quantities of hydrogen can be prepared by the addition of hydrochloric acid to zinc. A sample of 195 mL of hydrogen was co

kenny6666 [7]

Answer:

mass of hydrogen collected is 0.016 gram

Explanation:

Given values:

For calculating mass we have to find the number of moles first

Ideal gas equation PV =nRT

Volume= 195 ml

Pressure: 753 torr =0.99 atm

Temperature: 25+273= 298 Kelvin

Ideal gas constant R= 0.0821 Latm/molK

Number of moles n= ?

So n= PV/RT

Adding the values

n= = (753 torr)(1 atm/760 torr)(195 mL)(1 L/1000 mL)/(0.0821 L·atm/mol·K)(273 K)

n = 0.007897 moles of H₂

Now mass of hydrogen collected = number of moles x Molar mass of H₂

= 0.007897 x 2

= 0.0157 g H₂

Now mass of hydrogen collected is 0.016 gram (rounding the amount)

4 0

3 years ago

A graduated cylinder has a mass of 50 g when empty. When 30 mL of water is added, the graduated cylinder has a mass of 120 g. If

Verdich [7]

Answer:

2.9g/cm^3

Explanation:

We're given that the mass of the system before the rock was added was

120g . The mass after the rock was added was 250g, so the rock's mass is 130g.

The initial volume of water in the graduated cylinder was

30 mL , and the volume after the rock was added read 75mL , so the rock's volume is 45mL

Density = Mass over Volume.

AKA. 130g/45mL

2.9g/cm^3 (rounded)

4 0

3 years ago

What are automated weather stations?

tekilochka [14]

I would say A. Because it looks as though it’s the best answer

5 0

3 years ago

Are you a fire alarm? Cause you're loud and annoying

Rama09 [41]

Answer:

yaaaaa babdbabaaaa lolll

Explanation:

6 0

3 years ago

A student titrated a solution containing 3.7066 g of an unknown Diprotic acid to the end point using 28.94 ml of 0.3021 M KOH so

uranmaximum [27]

Answer:

Molar mass of the diprotic acid is 424 grams

Explanation:

[hint: diprotic acid only contains 2 hydrogen protons]

Ionic equation:

${ \bf{2OH { }^{ - } _{(aq)} + 2H { }^{ + } _{(aq)}→ 2H _{2} O _{(l)} }}$

first, we get moles of potassium hydroxide in 28.94 ml :

${ \sf{1 \: l \: of \: KOH \: contains \: 0.3021 \: moles}} \\ { \sf{0.02894 \: l \: of \: KOH \: contain \: (0.02894 \times 0.3021) \: moles}} \\ { \underline{ = 0.008743 \: moles}}$

since mole ratio of diprotic acid : base is 2 : 2, moles are the same.

Therefore, moles of acid that reacted are 0.008743 moles.

${ \sf{0.008743 \: moles \: of \: acid \: weigh \: 3.7066 \: g}} \\ { \sf{1 \: mole \: of \: acid \: weighs \: ( \frac{1 \times 3.7066}{0.008743}) \: g }} \\ = { \underline{423.95 \: g \approx424 \: grams}}$

for the molar mass:

8 0

3 years ago