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3 years ago

Need help with science pls help me

Chemistry

1 answer:

hoa [83]3 years ago

3 0

Answer:

B. negative charge only

Explanation:

The saying "opposites attract" is true in the case. Since the rod is positively charged, the sphere must have a negative charge to be attracted to it.

A sphere that is positively charged would be repelled from the rod, and a neutral sphere would not be attracted or repelled.

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Water (2230 g ) is heated until it just begins to boil. If the water absorbs 5.73×105 J of heat in the process, what was the ini

shutvik [7]

Answer: $38.5^0C$

Explanation:

To calculate the initial temperature of the water:

$q=m\times c\times (T_{final}-T_{initial})$

where,

q = heat absorbed = $5.73\times 10^5J$

$c$ = specific heat of water = $4.18J/g^oC$

m = mass of water = 2230 g

$T_{final}$ = final temperature of water = $100^0C$

$T_{initial}$ = initial temperature of metal = ?

Now put all the given values in the above formula, we get:

$5.73\times 10^5J=2230g\times 4.18J/g^oC\times (100-T_i)^0C$

$(100-T_i)=61.5$

$T_i=100-61.5)=38.5^0C$

Thus, the initial temperature of the water is $38.5^0C$

5 0

4 years ago

Celery stalks that are immersed in fresh water for several hours become stiff and hard. similar stalks left in asalt solution be

galina1969 [7]

Plasmolysed because of osmosis as the salt solution has lower water potential than the cells of the stalk

4 0

3 years ago

An ideal gas originally at 0.85 atm and 66°C was allowed to expand until its final volume, pressure, and temperature were 94 mL,

svet-max [94.6K]

Answer : The initial volume was, 71.2 mL

Explanation :

To calculate the volume when temperature and pressure has changed, we use the equation given by combined gas law.

The equation follows:

$\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}$

where,

$P_1,V_1\text{ and }T_1$ are the initial pressure, volume and temperature of the gas

$P_2,V_2\text{ and }T_2$ are the final pressure, volume and temperature of the gas

We are given:

$P_1=0.85atm\\V_1=?\\T_1=66^oC=[66+273]K=339K\\P_2=0.60atm\\V_2=94mL\\T_2=43^oC=[43+273]K=316K$

Now put all the given values in above equation, we get:

$\frac{0.85atm\times V_1}{339K}=\frac{0.60atm\times 94mL}{316K}$

$V_1=71.2mL$

Therefore, the initial volume was, 71.2 mL

4 0

4 years ago

Which statement best explains the process occurring in step 4 of the life<br>cycle?

Marat540 [252]

Answer:

Which statement best compares a eukaryote and a prokaryote?

A. Eukaryotes have a cell wall, while prokaryotes have a cell membrane.

*B. Eukaryotes have membrane-bound organelles, while prokaryotes have few specialized

structures.

C. Eukaryotes use active transport to move substances across the cell membrane, while

prokaryotes use facilitated diffusion.

D. Eukaryotes use flagella to move themselves through substances, while prokaryotes are not

able to move.

Explanation: its B

5 0

4 years ago

What is the correcr sum of Cl2+KBr=Br2+KCl

oksano4ka [1.4K]

Cl2 + 2KBr = Br2 + 2KCl

8 0

3 years ago