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sattari [20]
3 years ago
15

What type of changes indicate a chemical change?

Mathematics
2 answers:
Kipish [7]3 years ago
8 0

Answer:


Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions

Mkey [24]3 years ago
4 0

Answer:

Change in smell or change, gas bubbles, color change,

Step-by-step explanation:


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Rewrite the 4cm: 8km as a ratio in the form 1: n
Delicious77 [7]

Answer:

1 : 200000

Step-by-step explanation:

4 cm ⇒ 8 km

4 cm ⇒ 8 × 1000m

4cm ⇒ 8000m

4 cm ⇒ 8000 × 100 cm

4 cm ⇒ 800000cm

4 : 800000

\frac{ 4 \:\::\:\ 800000}{4}

1 : 200000

Therefore,

1 : n

1 : 200000

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1288.05

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3 years ago
If DE=52 and EF=21, find DE
dalvyx [7]

Answer:

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Step-by-step explanation:

You already said that DE=52.

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3 years ago
A 13-inch candle is lit and steadily burns until it is burned out.
brilliants [131]

Answer:

a. The remaining length of the candle varies from <u>10 </u>inches to <u>5.5</u> inches

b. Remaining Length = 13 - b

Step-by-step explanation:

b.

The remaining (unburnt) length of the candle must be equal to the difference between total length of the candle and the burnt length of the candle. So, the expression for the remaining length can be written as:

Remaining Length = Total Length - Burnt Length

where,

Total length = 13 inch

Burnt Length = b

Therefore,

<u>Remaining Length = 13 - b</u>

<u></u>

b.

Now, we use the same expression for:

burned length = 3 inches

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Remaining Length = 13 inches - 3 inches

Remaining Length = 10 inches

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burned length = 7.5 inches

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Remaining Length = 13 inches - 7.5 inches

Remaining Length = 5.5 inches

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<u>The remaining length of the candle varies from 10 inches to 5.5 inches</u>

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3 years ago
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Answer:

A, 11

Step-by-step explanation:

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