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ArbitrLikvidat [17]
4 years ago
8

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

Chemistry
1 answer:
salantis [7]4 years ago
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..<br><br> 1) Joules <br> 2) Watts <br> 3) Calories <br> 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.
3 0
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.
4 0
4 years ago
Read 2 more answers
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