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4 years ago

I NEED HELP ASAP!! DO IN A HOUR!! POEASE HELP!!A scientist views different objects using a light microscope. Which features

1 answer:

4 0

Different types of cells
Small organelle features
Smaller number of cells

I hope this helps, this would be my answer good luck!

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Describe what happens to the size of atoms of the elements as you go across a row and down a column in the periodic table. expla

ipn [44]

Atom size increases down a group because there is an increase in the number of shells so the attraction between electrons and protons decreases. Atom size decreases across a period because the number of protons increases meaning that there is more attraction between the protons and electrons therefore drawing the outer shells closer to the nucleus.

8 0

3 years ago

Energy from food is measured in.. 1) Joules 2) Watts 3) Calories 4) Kilograms

rjkz [21]

Energy from food is measured in calories. We convert the calories into chemical energy.

Therefore, the answer is the 3rd choice.

4 0

3 years ago

4. When 732 grams of water was heated, it absorbed 1962 Joules of heat. The original temperature of the water was 45°C. What was

SCORPION-xisa [38]

Answer:

$T_{final} =45.64C$ =final temperature

Explanation:

In the question specific heat of water is not given but we should know the value of that and it 4.18Jg∘C

Specific heat means how much heat is required to increase the temperature of 1 gram of substance that substance by 1∘C .

Equation between heat lost or gain and the change in temperature.

q=m⋅c⋅ΔT , where

q - the amount of heat

m - the mass of the sample

c - specific heat of sample

ΔT - change in temperature

put all the given value into this ,

$q=m\times c \times \Delta T$

$\Delta T=\frac{q}{mc} =\frac{1962}{732 \times 4.18}$

$\Delta T= 0.64C$

$T_{final} -T_{initial} =0.64C$

$T_{final} =45.64C$ =final temperature.

8 0

4 years ago

Which pair of atoms has the highest electronegativity difference? Na-F Ca-F H-F C-F F-F

babunello [35]

The answer is Na-F. The F has highest electronegativity among these elements. So we need to find the element with smallest electronegativity. And this element is Na.

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4 years ago

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Which term refers to the energy emitted when an electron moves from a higher energy level to a lower one?

Stells [14]

When it switches to a lower orbital, the atom emits energy in the form of photons.

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4 years ago

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