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3 years ago

What happens to the temperature of a substance during a phase change?

Chemistry

1 answer:

Cloud [144]3 years ago

8 0

C. It stays the same as energy is added.

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I need help with both questions

a_sh-v [17]

Answer:

not sure about 6 but 7 should be c

Explanation:

6 0

3 years ago

A 10-ft moving truck has a volume capacity of 402 cubic feet, which is equivalent to 1.138 x 10⁷ milliliters. What mass of silve

steposvetlana [31]

Answer:

The mass of silver is $1.19\times 10^{14}\ Mg$

Explanation:

Given that,

The volume of the truck is 402 cubic feet or 1.138 x 10⁷ mm.

The density of silver is 10.49 g/mL.

We need to find the mass of silver that will fit in this moving truck. Density equals mass divided by volume. So,

$d=\dfrac{m}{V}\\\\\text{where m is mass}\\\\m=d\times V\\\\m=10.49\ g/mL\times 1.138 \times 10^7\ mL\\\\m=119376200\ g$

1 gram = 10⁻⁶ Megagram

$119376200=1.19\times 10^{14}\ Mg$

Hence, the mass of silver is $1.19\times 10^{14}\ Mg$

4 0

3 years ago

The solid block shown below has a mass of 146 grams. THE DIMENSIONS OF THE BLOCK ARE- 3.0 cm by 4.5 cm by 7.0 cm. What is the bl

Amiraneli [1.4K]

Explanation:

D=m÷v

D=146÷(3×4.5×7)

D=146÷94.5

D=1.54g/cm^3

5 0

3 years ago

Binary compound of oxygen and an unknown element,X, has the formula XO2 and is 69.55 mass % oxygen, what is the weight of elemen

marissa [1.9K]

Answer:

Weight of element X = 14.01 gram

Explanation:

Mass percentage is calculated by using :

$Percent =\frac{Mass\ of\ element}{Total\ mass}\times 100$

$O\ Percent=\frac{Mass\ of\ O}{Total\ mass\ of\ XO2}\times 100$

Mass of O = 16.0 gram

let mass of X = X grams = ?

Mass of XO2 = mass of X + 2(mass of O)

Mass of XO2 = X + 2(16)

Mass of XO2 = X + 32

Total mass of O in the compound = 2(16) = 32 grams

Percent O = 69.55 %

$Percent\ O =\frac{Mass\ of\ O}{Total\ mass\ of\ XO2}\times 100$

$69.55=\frac{32}{X+32}\times 100$

$\frac{69.55}{100}=\frac{32}{X+32}$

$0.6955=\frac{32}{X+32}$

$0.6955\times (X+32)=32$

$0.6955X+ 22.256=32$

$0.6955X=9.744$

$X=\frac{9.744}{0.6955}$

$X =14.01$

weight of element X = 14.01 gram

14.01 is mass of nitrogen N

The correct formula of this element is NO2

6 0

3 years ago

Is the following chemical equation balanced? AgNO3 + NaCl 4AgCl + NaNO3 yes no

marta [7]

No. Reactants: 1 silver, 1 chlorine; products: 4 silver, 4 chlorine. Therefore, not balanced.

7 0

3 years ago